Citadel Support

[#] Sun Nov 23 2025 00:07:43 UTC from IGnatius T Foobar

Subject: Re: DKIM record

Good to hear. Google are absolute nazis when it comes to what kind of email they'll accept. If you get your Compliance Status all green, consider it a badge of honor. And thanks for using Citadel!

[#] Sun Nov 23 2025 15:16:18 UTC from Bart

Subject: Berkeley DB cannot be downloaded

(I hope this is the Citadel Support room)

Hello,

I'm trying to install Citadel on my Rpi3 using your easyinstall script. The script does not complete. During installation it needs a certain Berkeley database file. This download is extremely slow and/or the file cannot be downloaded. When I go to https://easyinstall.citadel.org/db-18.1.40.tar.gz myself using a browser the download also fails.

Any help is appreciated.

Regards Bart

A piece of the script output is:

Downloading Berkeley DB...
--2025-11-23 14:52:31-- https://easyinstall.citadel.org/db-18.1.40.tar.gz
Resolving easyinstall.citadel.org (easyinstall.citadel.org)... 72.0.224.90
Connecting to easyinstall.citadel.org (easyinstall.citadel.org)|72.0.224.90|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 30745815 (29M) [application/octet-stream]
Saving to: 'db-18.1.40.tar.gz'

db-18.1.40.tar.gz 2%[ ] 879.74K --.-KB/s eta 58m 51sc

[#] Sun Nov 23 2025 23:43:28 UTC from Nurb432

Subject: Re: Berkeley DB cannot be downloaded

I don't want to speak for LG as i'm not sure if hes hosting the files via the same network provider as the board, but there have been network issues here of late here on the board, and if my guess is right, it could/would effect that too.

Keep retrying..

[#] Sun Nov 23 2025 23:48:30 UTC from Nurb432

Subject: Re: Berkeley DB cannot be downloaded

Sorry, IG not LG.. fat fingers.

Also, i was able to download it a bit ago, yes slowly, but it did finally complete. Id offer to share it out on google or something, but if you are smart, you would not trust me anyway.

SorSun Nov 23 2025 23:43:28 UTC from Nurb432 Subject: Re: Berkeley DB cannot be downloaded

I don't want to speak for LG as i'm not sure if hes hosting the files via the same network provider as the board, but there have been network issues here of late here on the board, and if my guess is right, it could/would effect that too.

Keep retrying..

[#] Mon Nov 24 2025 01:35:20 UTC from IGnatius T Foobar

Subject: Re: Berkeley DB cannot be downloaded

That's correct, actually. Over the last couple of days we've had some pretty bad network flooding. I think I've got most of it worked out so try again.

[#] Wed Dec 03 2025 15:50:32 UTC from Davinci

Subject: Email setup

First of all I am very new to this, so my apologies in advance.

I've had a longtime project to setup an email server that I'm getting back to. I was following an older video as guidance in which Citadel had an Administration tab right next to the Advanced tab. I already have the domain and need to enter that information so that I can create the various email accounts using the Citadel Server. Without the Advanced tab, I can't find where to enter the domain information. With so much reference information I can't seem to find what I need, I have no doubt that it's there-somewhere. Can someone point me in the right direction?

[#] Thu Dec 04 2025 16:47:58 UTC from IGnatius T Foobar

Subject: Re: Email setup

If you don't see the Administration tab, you're not logged in as an administrator.

[#] Wed Dec 24 2025 19:41:34 UTC from alperumit

Subject: Reproducible SIGSEGV caused by concurrency between IMAP FETCH, SMTP DATA, SMTP forwarding (Sieve), and SMTP queue delivery

Hello Citadel Team,

I'm reporting a reproducible segmentation fault (SIGSEGV) observed in production, which appears to be caused by a concurrency / thread-safety issue in Citadel under normal usage conditions. I have collected multiple core dumps showing consistent call patterns and triggers.

Deployment: Docker

OS: Linux x86_64 (glibc-based)

Protocols in use:

* IMAPS

* SMTP (inbound + outbound)

* SMTP queue delivery

Sieve: Enabled (email forwarding rules)

No custom patches. No abnormal traffic patterns.

Observed Behaviour

Citadel crashes with SIGSEGV during normal operation. The crashes began after ~26 weeks of stable, uninterrupted operation, without any infrastructure or configuration changes. The only relevant behavioural change before the first crash was the introduction of new Sieve forwarding rules, which increased outbound SMTP activity.

From Core Dumps

The crashes consistently occur when the following operations overlap in time:

Thread A – IMAP FETCH (user reading mail)

imap_fetch_body()

imap_do_fetch_msg()

imap_do_fetch()

imap_command_loop()

Thread B – SMTP DATA (receiving mail)

smtp_data()

smtp_command_loop()

CtdlReadMessageBodyBuf()

StrBufTCP_read_buffered_line_fast()

Thread C – SMTP Forwarding / Queue Delivery

smtp_attempt_delivery()

smtp_do_queue()

smtp_do_queue_full()

curl_easy_perform()

curl_multi_poll()

Additional Concurrent Activity

* TLS handshakes (CtdlStartTLS, imaps_greeting, pop3s_greeting)

* Session cleanup and hooks (PerformSessionHooks, do_housekeeping)

* In some crashes, XMPP hooks are also active

Analysis / Suspected Root Cause

Based on repeated core dump analysis:

These execution paths share internal buffers/message structures
Some of these paths appear not to be fully thread-safe
Increased outbound SMTP concurrency (introduced by Sieve forwarding) significantly raises the likelihood of these paths overlapping
This results in memory corruption, eventually causing a SIGSEGV (often observed shortly after read(), select(), or buffer handling)

Important notes:

The Sieve rules themselves are valid and correctly defined
The issue is not caused by user error or misconfiguration
Forwarding acts as a trigger, not the root defect

Reproduction Pattern (High-Level)

While not 100% deterministic, the crash frequency increases significantly when:

Sieve forwarding is enabled for active mailboxes
Inbound SMTP traffic is present
Users fetch messages (IMAP FETCH) concurrently
SMTP queue delivery runs in parallel (especially to external domains)

Reducing worker thread concurrency significantly reduces or eliminates crashes, which further suggests a concurrency-related issue.

Expected Behaviour

Citadel should be able to safely handle concurrent:

IMAP FETCH
SMTP DATA
SMTP forwarding (Sieve)
SMTP queue delivery

without memory corruption or segmentation faults.

Questions for the Development Team

Is this a known concurrency issue?
Has this behaviour been addressed in newer Citadel versions?
Are there recommended patches, configuration flags, or build options to mitigate this safely?
Would additional debugging data (full core dumps, symbols, logs) be helpful?

Thank you for your time and for maintaining Citadel.

root@tpc-co-cit02:/# gdb /usr/local/citadel/citserver /citadel-data/server1-backup/core.7

GNU gdb (Debian 10.1-1.7) 10.1.90.20210103-git

License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

This is free software: you are free to change and redistribute it.

There is NO WARRANTY, to the extent permitted by law.

Type "show copying" and "show warranty" for details.

This GDB was configured as "x86_64-linux-gnu".

Type "show configuration" for configuration details.

For bug reporting instructions, please see:

<https://www.gnu.org/software/gdb/bugs/>.

Find the GDB manual and other documentation resources online at:

<http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".

Type "apropos word" to search for commands related to "word"...

Reading symbols from /usr/local/citadel/citserver...

(No debugging symbols found in /usr/local/citadel/citserver)

[New LWP 69]

[New LWP 18]

[New LWP 116]

[New LWP 113]

[New LWP 7]

[New LWP 105]

[New LWP 15]

[New LWP 92]

[New LWP 120]

[New LWP 10]

[New LWP 67]

[New LWP 597]

[New LWP 11]

[Thread debugging using libthread_db enabled]

Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

Core was generated by `citserver -x9 -h /citadel-data'.

Program terminated with signal SIGSEGV, Segmentation fault.

#0 0x0000561e86ca5f3f in imap_fetch_body ()

[Current thread is 1 (Thread 0x7f280bfff700 (LWP 69))]

(gdb) set pagination off

(gdb) thread apply all bt full

Thread 13 (Thread 0x7f28225c7700 (LWP 11)):

#0 0x00007f2825d27a0f in __GI___poll (fds=0x7f28225bf870, nfds=2, timeout=1000) at ../sysdeps/unix/sysv/linux/poll.c:29

__arg2 = <optimized out>

_a3 = 1000

_a1 = 139810351872112

resultvar = <optimized out>

__arg3 = <optimized out>

__arg1 = <optimized out>

_a2 = 2

resultvar = <optimized out>

sc_cancel_oldtype = <optimized out>

sc_ret = <optimized out>

#1 0x00007f2825e75bca in ?? () from /usr/lib/x86_64-linux-gnu/libcurl.so.4

No symbol table info available.

#2 0x00007f2825e6abcc in ?? () from /usr/lib/x86_64-linux-gnu/libcurl.so.4

No symbol table info available.

#3 0x00007f2825e6ad56 in curl_multi_poll () from /usr/lib/x86_64-linux-gnu/libcurl.so.4

No symbol table info available.

#4 0x00007f2825e439cf in curl_easy_perform () from /usr/lib/x86_64-linux-gnu/libcurl.so.4

No symbol table info available.

#5 0x0000561e86cc32c5 in smtp_attempt_delivery ()

No symbol table info available.

#6 0x0000561e86cc38f2 in smtp_process_one_msg ()

No symbol table info available.

#7 0x0000561e86cc3f33 in smtp_do_queue ()

No symbol table info available.

#8 0x0000561e86cc3fbf in smtp_do_queue_full ()

No symbol table info available.

#9 0x0000561e86c87e13 in PerformSessionHooks ()

No symbol table info available.

#10 0x0000561e86c73dd5 in do_housekeeping ()

No symbol table info available.

#11 0x0000561e86c8a952 in worker_thread ()

No symbol table info available.

#12 0x00007f2825fd1ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477

ret = <optimized out>

pd = <optimized out>

unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139810351904512, -5926168278360471484, 140734826778382, 140734826778383, 139810351902080, 8396800, 6021948088529373252, 6021962115441018948}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}

not_first_call = 0

#13 0x00007f2825d33acf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:71

No locals.

#14 0x0000000000000000 in ?? ()

No symbol table info available.

Thread 12 (Thread 0x7f2808ff9700 (LWP 597)):

#0 0x00007f2825d29ec3 in __GI___select (nfds=59, readfds=0x7f2808ff8bf0, writefds=0x0, exceptfds=0x0, timeout=0x7f2808ff8be0) at ../sysdeps/unix/sysv/linux/select.c:41

__arg3 = 0

_a5 = 139809926384608

_a2 = 139809926384624

__arg4 = 0

__arg1 = 59

_a3 = 0

resultvar = <optimized out>

__arg5 = 139809926384608

__arg2 = 139809926384624

_a4 = 0

_a1 = 59

resultvar = <optimized out>

sc_cancel_oldtype = -514

sc_ret = <optimized out>

#1 0x0000561e86c8a447 in worker_thread ()

No symbol table info available.

#2 0x00007f2825fd1ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477

ret = <optimized out>

pd = <optimized out>

unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139809926387456, -5926168278360471484, 140734826778382, 140734826778383, 139809926385024, 139809977318912, 6021898356029311044, 6021962115441018948}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}

not_first_call = 0

#3 0x00007f2825d33acf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:71

No locals.

#4 0x0000000000000000 in ?? ()

No symbol table info available.

Thread 11 (Thread 0x7f2820dbc700 (LWP 67)):

#0 __libc_read (nbytes=8191, buf=0x7f2810130b10, fd=33) at ../sysdeps/unix/sysv/linux/read.c:26

resultvar = 18446744073709551104

sc_cancel_oldtype = 0

__arg3 = <optimized out>

_a2 = <optimized out>

sc_ret = <optimized out>

__value = <optimized out>

__arg1 = <optimized out>

_a3 = <optimized out>

resultvar = <optimized out>

__arg2 = <optimized out>

_a1 = <optimized out>

#1 __libc_read (fd=33, buf=0x7f2810130b10, nbytes=8191) at ../sysdeps/unix/sysv/linux/read.c:24

No locals.

#2 0x00007f2825fffed6 in StrBufTCP_read_buffered_line_fast (Line=0x7f28100fe740, IOBuf=0x7f28000dfb30, Pos=0x7f28000a36e0, fd=0x7f28000a3728, timeout=5, selectresolution=<optimized out>, Error=0x7f2820dba9a0) at lib/stringbuf.c:4317

pche = <optimized out>

pos = <optimized out>

pLF = 0x0

len = <optimized out>

rlen = <optimized out>

retlen = 19

nSuccessLess = 0

rfds = {fds_bits = {0, 524288, 126, 32783, 524336, 8192, 35390530551809, 541165879534, 128, 579820586075, 1024, 16, 131072, 4096, 524288, 978326477955633920}}

pch = <optimized out>

fdflags = <optimized out>

IsNonBlock = 0

tv = {tv_sec = 32767, tv_usec = 7}

#3 0x0000561e86c89cbb in CtdlClientGetLine ()

No symbol table info available.

#4 0x0000561e86c81944 in CtdlReadMessageBodyBuf ()

No symbol table info available.

#5 0x0000561e86cc1847 in smtp_data ()

No symbol table info available.

#6 0x0000561e86cc2227 in smtp_command_loop ()

No symbol table info available.

#7 0x0000561e86c8a8a7 in worker_thread ()

No symbol table info available.

#8 0x00007f2825fd1ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477

ret = <optimized out>

pd = <optimized out>

unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139810326693632, -5926168278360471484, 140734826778382, 140734826778383, 139810326691200, 8396800, 6021951441288218692, 6021962115441018948}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}

not_first_call = 0

#9 0x00007f2825d33acf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:71

No locals.

#10 0x0000000000000000 in ?? ()

No symbol table info available.

Thread 10 (Thread 0x7f2822dc8700 (LWP 10)):

#0 0x00007f2825d29ec3 in __GI___select (nfds=59, readfds=0x7f2822dc7bf0, writefds=0x0, exceptfds=0x0, timeout=0x7f2822dc7be0) at ../sysdeps/unix/sysv/linux/select.c:41

__arg3 = 0

_a5 = 139810360294368

_a2 = 139810360294384

__arg4 = 0

__arg1 = 59

_a3 = 0

resultvar = <optimized out>

__arg5 = 139810360294368

__arg2 = 139810360294384

_a4 = 0

_a1 = 59

resultvar = <optimized out>

sc_cancel_oldtype = -514

sc_ret = <optimized out>

#1 0x0000561e86c8a447 in worker_thread ()

No symbol table info available.

#2 0x00007f2825fd1ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477

ret = <optimized out>

pd = <optimized out>

unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139810360297216, -5926168278360471484, 140734826778382, 140734826778383, 139810360294784, 8396800, 6021946989554616388, 6021962115441018948}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}

not_first_call = 0

#3 0x00007f2825d33acf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:71

No locals.

#4 0x0000000000000000 in ?? ()

No symbol table info available.

Thread 9 (Thread 0x7f28097fa700 (LWP 120)):

#0 0x00007f2825d29ec3 in __GI___select (nfds=59, readfds=0x7f28097f9bf0, writefds=0x0, exceptfds=0x0, timeout=0x7f28097f9be0) at ../sysdeps/unix/sysv/linux/select.c:41

__arg3 = 0

_a5 = 139809934777312

_a2 = 139809934777328

__arg4 = 0

__arg1 = 59

_a3 = 0

resultvar = <optimized out>

__arg5 = 139809934777312

__arg2 = 139809934777328

_a4 = 0

_a1 = 59

resultvar = <optimized out>

sc_cancel_oldtype = -514

sc_ret = <optimized out>

#1 0x0000561e86c8a447 in worker_thread ()

No symbol table info available.

#2 0x00007f2825fd1ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477

ret = <optimized out>

pd = <optimized out>

unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139809934780160, -5926168278360471484, 140734826778382, 140734826778383, 139809934777728, 139810111629120, 6021901655101065284, 6021962115441018948}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}

not_first_call = 0

#3 0x00007f2825d33acf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:71

No locals.

#4 0x0000000000000000 in ?? ()

No symbol table info available.

Thread 8 (Thread 0x7f280b7fe700 (LWP 92)):

#0 0x00007f2825d29ec3 in __GI___select (nfds=59, readfds=0x7f280b7fdbf0, writefds=0x0, exceptfds=0x0, timeout=0x7f280b7fdbe0) at ../sysdeps/unix/sysv/linux/select.c:41

__arg3 = 0

_a5 = 139809968348128

_a2 = 139809968348144

__arg4 = 0

__arg1 = 59

_a3 = 0

resultvar = <optimized out>

__arg5 = 139809968348128

__arg2 = 139809968348144

_a4 = 0

_a1 = 59

resultvar = <optimized out>

sc_cancel_oldtype = -514

sc_ret = <optimized out>

#1 0x0000561e86c8a447 in worker_thread ()

No symbol table info available.

#2 0x00007f2825fd1ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477

ret = <optimized out>

pd = <optimized out>

unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139809968350976, -5926168278360471484, 140734826778382, 140734826778383, 139809968348544, 139810110988112, 6021897259202037828, 6021962115441018948}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}

not_first_call = 0

#3 0x00007f2825d33acf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:71

No locals.

#4 0x0000000000000000 in ?? ()

No symbol table info available.

Thread 7 (Thread 0x7f2821dbe700 (LWP 15)):

#0 __libc_read (nbytes=63, buf=0x7f27e4122af0, fd=57) at ../sysdeps/unix/sysv/linux/read.c:26

resultvar = 18446744073709551104

sc_cancel_oldtype = 0

__arg3 = <optimized out>

_a2 = <optimized out>

sc_ret = <optimized out>

__value = <optimized out>

__arg1 = <optimized out>

_a3 = <optimized out>

resultvar = <optimized out>

__arg2 = <optimized out>

_a1 = <optimized out>

#1 __libc_read (fd=57, buf=0x7f27e4122af0, nbytes=63) at ../sysdeps/unix/sysv/linux/read.c:24

No locals.

#2 0x00007f2825fffed6 in StrBufTCP_read_buffered_line_fast (Line=0x7f2818078d50, IOBuf=0x7f27ec0fc8b0, Pos=0x7f27e4079ec0, fd=0x7f27e4079f08, timeout=5, selectresolution=<optimized out>, Error=0x7f2821dbc9a0) at lib/stringbuf.c:4317

pche = <optimized out>

pos = <optimized out>

pLF = 0x0

len = <optimized out>

rlen = <optimized out>

retlen = 0

nSuccessLess = 0

rfds = {fds_bits = {1, 139810178072704, 511, 7, 0, 8192, 139809775419499, 527, 8240, 128, 755914244609, 532575944816, 2, 511101108331, 16, 0}}

pch = <optimized out>

fdflags = <optimized out>

IsNonBlock = 0

tv = {tv_sec = 139810343471552, tv_usec = 139810409532778}

#3 0x0000561e86c89cbb in CtdlClientGetLine ()

No symbol table info available.

#4 0x0000561e86c81944 in CtdlReadMessageBodyBuf ()

No symbol table info available.

#5 0x0000561e86cc1847 in smtp_data ()

No symbol table info available.

#6 0x0000561e86cc2227 in smtp_command_loop ()

No symbol table info available.

#7 0x0000561e86c8a8a7 in worker_thread ()

No symbol table info available.

#8 0x00007f2825fd1ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477

ret = <optimized out>

pd = <optimized out>

unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139810343479040, -5926168278360471484, 140734826778382, 140734826778383, 139810343476608, 139810111003408, 6021953643532699716, 6021962115441018948}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}

not_first_call = 0

#9 0x00007f2825d33acf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:71

No locals.

#10 0x0000000000000000 in ?? ()

No symbol table info available.

Thread 6 (Thread 0x7f280affd700 (LWP 105)):

#0 __libc_read (nbytes=8191, buf=0x7f280018baf0, fd=56) at ../sysdeps/unix/sysv/linux/read.c:26

resultvar = 18446744073709551104

sc_cancel_oldtype = 0

__arg3 = <optimized out>

_a2 = <optimized out>

sc_ret = <optimized out>

__value = <optimized out>

__arg1 = <optimized out>

_a3 = <optimized out>

resultvar = <optimized out>

__arg2 = <optimized out>

_a1 = <optimized out>

#1 __libc_read (fd=56, buf=0x7f280018baf0, nbytes=8191) at ../sysdeps/unix/sysv/linux/read.c:24

No locals.

#2 0x00007f2825fffed6 in StrBufTCP_read_buffered_line_fast (Line=0x7f2800053fc0, IOBuf=0x7f281c090d00, Pos=0x7f281c0f7440, fd=0x7f281c0f7488, timeout=5, selectresolution=<optimized out>, Error=0x7f280affb9a0) at lib/stringbuf.c:4317

pche = <optimized out>

pos = <optimized out>

pLF = 0x0

len = <optimized out>

rlen = <optimized out>

retlen = 20

nSuccessLess = 0

rfds = {fds_bits = {0, 262144, 125, 16399, 262192, 4096, 17798344491009, 139810409524331, 64, 545460847195, 512, 8, 131072, 4096, 262144, 978326477955633920}}

pch = <optimized out>

fdflags = <optimized out>

IsNonBlock = 0

tv = {tv_sec = 16383, tv_usec = 7}

#3 0x0000561e86c89cbb in CtdlClientGetLine ()

No symbol table info available.

#4 0x0000561e86c81944 in CtdlReadMessageBodyBuf ()

No symbol table info available.

#5 0x0000561e86cc1847 in smtp_data ()

No symbol table info available.

#6 0x0000561e86cc2227 in smtp_command_loop ()

No symbol table info available.

#7 0x0000561e86c8a8a7 in worker_thread ()

No symbol table info available.

#8 0x00007f2825fd1ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477

ret = <optimized out>

pd = <optimized out>

unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139809959958272, -5926168278360471484, 140734826778382, 140734826778383, 139809959955840, 139810044056768, 6021893960130283588, 6021962115441018948}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}

not_first_call = 0

#9 0x00007f2825d33acf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:71

No locals.

#10 0x0000000000000000 in ?? ()

No symbol table info available.

Thread 5 (Thread 0x7f2822f2d980 (LWP 7)):

#0 0x00007f2825cfa241 in __GI___clock_nanosleep (clock_id=0, flags=0, req=0x7fff615b8fd0, rem=0x0) at ../sysdeps/unix/sysv/linux/clock_nanosleep.c:48

sc_cancel_oldtype = <optimized out>

sc_ret = <optimized out>

r = <optimized out>

#1 0x00007f2825cffa23 in __GI___nanosleep (requested_time=0x0, remaining=0x0) at nanosleep.c:27

ret = <optimized out>

#2 0x0000000000000000 in ?? ()

No symbol table info available.

Thread 4 (Thread 0x7f280a7fc700 (LWP 113)):

#0 __libc_read (nbytes=5, buf=0x7f27f403a183, fd=47) at ../sysdeps/unix/sysv/linux/read.c:26

resultvar = 18446744073709551104

sc_cancel_oldtype = 0

__arg3 = <optimized out>

_a2 = <optimized out>

sc_ret = <optimized out>

__value = <optimized out>

__arg1 = <optimized out>

_a3 = <optimized out>

resultvar = <optimized out>

__arg2 = <optimized out>

_a1 = <optimized out>

#1 __libc_read (fd=47, buf=0x7f27f403a183, nbytes=5) at ../sysdeps/unix/sysv/linux/read.c:24

No locals.

#2 0x00007f28260f35e5 in ?? () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1

No symbol table info available.

#3 0x00007f28260ee7fa in ?? () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1

No symbol table info available.

#4 0x00007f28260ed6a4 in ?? () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1

No symbol table info available.

#5 0x00007f28260edc73 in BIO_read () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1

No symbol table info available.

#6 0x00007f2826346771 in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1

No symbol table info available.

#7 0x00007f282634a982 in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1

No symbol table info available.

#8 0x00007f28263482c0 in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1

No symbol table info available.

#9 0x00007f282637b499 in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1

No symbol table info available.

#10 0x00007f2826370f75 in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1

No symbol table info available.

#11 0x0000561e86c9667f in CtdlStartTLS ()

No symbol table info available.

#12 0x0000561e86c8806f in CtdlModuleStartCryptoMsgs ()

No symbol table info available.

#13 0x0000561e86caf4d1 in imaps_greeting ()

No symbol table info available.

#14 0x0000561e86c8a88a in worker_thread ()

No symbol table info available.

#15 0x00007f2825fd1ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477

ret = <optimized out>

pd = <optimized out>

unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139809951565568, -5926168278360471484, 140734826778382, 140734826778383, 139809951563136, 139810044037136, 6021895056957556804, 6021962115441018948}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}

not_first_call = 0

#16 0x00007f2825d33acf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:71

No locals.

#17 0x0000000000000000 in ?? ()

No symbol table info available.

Thread 3 (Thread 0x7f2809ffb700 (LWP 116)):

#0 __libc_read (nbytes=5, buf=0x7f27ec0d8873, fd=60) at ../sysdeps/unix/sysv/linux/read.c:26

resultvar = 18446744073709551104

sc_cancel_oldtype = 0

__arg3 = <optimized out>

_a2 = <optimized out>

sc_ret = <optimized out>

__value = <optimized out>

__arg1 = <optimized out>

_a3 = <optimized out>

resultvar = <optimized out>

__arg2 = <optimized out>

_a1 = <optimized out>

#1 __libc_read (fd=60, buf=0x7f27ec0d8873, nbytes=5) at ../sysdeps/unix/sysv/linux/read.c:24

No locals.

#2 0x00007f28260f35e5 in ?? () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1

No symbol table info available.

#3 0x00007f28260ee7fa in ?? () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1

No symbol table info available.

#4 0x00007f28260ed6a4 in ?? () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1

No symbol table info available.

#5 0x00007f28260edc73 in BIO_read () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1

No symbol table info available.

#6 0x00007f2826346771 in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1

No symbol table info available.

#7 0x00007f282634a982 in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1

No symbol table info available.

#8 0x00007f28263482c0 in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1

No symbol table info available.

#9 0x00007f282637b499 in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1

No symbol table info available.

#10 0x00007f2826370f75 in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1

No symbol table info available.

#11 0x0000561e86c9667f in CtdlStartTLS ()

No symbol table info available.

#12 0x0000561e86c8806f in CtdlModuleStartCryptoMsgs ()

No symbol table info available.

#13 0x0000561e86cb9de7 in pop3s_greeting ()

No symbol table info available.

#14 0x0000561e86c8a88a in worker_thread ()

No symbol table info available.

#15 0x00007f2825fd1ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477

ret = <optimized out>

pd = <optimized out>

unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139809943172864, -5926168278360471484, 140734826778382, 140734826778383, 139809943170432, 139810111553776, 6021900553978824772, 6021962115441018948}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}

not_first_call = 0

#16 0x00007f2825d33acf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:71

No locals.

#17 0x0000000000000000 in ?? ()

No symbol table info available.

Thread 2 (Thread 0x7f28215bd700 (LWP 18)):

#0 0x0000561e86ccdd8a in xmpp_queue_event ()

No symbol table info available.

#1 0x0000561e86ccc711 in xmpp_logout_hook ()

No symbol table info available.

#2 0x0000561e86c87e13 in PerformSessionHooks ()

No symbol table info available.

#3 0x0000561e86c8bf2e in CtdlUserLogout ()

No symbol table info available.

#4 0x0000561e86c6fe29 in RemoveContext ()

No symbol table info available.

#5 0x0000561e86c70943 in dead_session_purge ()

No symbol table info available.

#6 0x0000561e86c8a94d in worker_thread ()

No symbol table info available.

#7 0x00007f2825fd1ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477

ret = <optimized out>

pd = <optimized out>

unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139810335086336, -5926168278360471484, 140734826778382, 140734826778383, 139810335083904, 8396800, 6021954742507456580, 6021962115441018948}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}

not_first_call = 0

#8 0x00007f2825d33acf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:71

No locals.

#9 0x0000000000000000 in ?? ()

No symbol table info available.

Thread 1 (Thread 0x7f280bfff700 (LWP 69)):

#0 0x0000561e86ca5f3f in imap_fetch_body ()

No symbol table info available.

#1 0x0000561e86ca6cbd in imap_do_fetch_msg ()

No symbol table info available.

#2 0x0000561e86ca6fda in imap_do_fetch ()

No symbol table info available.

#3 0x0000561e86ca7a77 in imap_fetch ()

No symbol table info available.

#4 0x0000561e86cb1c0b in imap_command_loop ()

No symbol table info available.

#5 0x0000561e86c8a8a7 in worker_thread ()

No symbol table info available.

#6 0x00007f2825fd1ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477

ret = <optimized out>

pd = <optimized out>

unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139809976743680, -5926168278360471484, 140734826778382, 140734826778383, 139809976741248, 8396800, 6021896158079797316, 6021962115441018948}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}

not_first_call = 0

#7 0x00007f2825d33acf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:71

No locals.

#8 0x0000000000000000 in ?? ()

No symbol table info available.

(gdb)

[#] Wed Dec 24 2025 22:45:49 UTC from alperumit

Subject: Reproducible SIGSEGV caused by concurrency between IMAP FETCH, SMTP DATA, SMTP forwarding (Sieve), and SMTP queue delivery

Hello Citadel Team,

I'm reporting a reproducible segmentation fault (SIGSEGV) observed in production, which appears to be caused by a concurrency / thread-safety issue in Citadel under normal usage conditions. I have collected multiple core dumps showing consistent call patterns and triggers.

Deployment: Docker

OS: Linux x86_64 (glibc-based)

Protocols in use:

* IMAPS

* SMTP (inbound + outbound)

* SMTP queue delivery

Sieve: Enabled (email forwarding rules)

No custom patches. No abnormal traffic patterns.

Observed Behaviour

Citadel crashes with SIGSEGV during normal operation. The crashes began after ~26 weeks of stable, uninterrupted operation, without any infrastructure or configuration changes. The only relevant behavioural change before the first crash was the introduction of new Sieve forwarding rules, which increased outbound SMTP activity.

From Core Dumps

The crashes consistently occur when the following operations overlap in time:

Thread A – IMAP FETCH (user reading mail)

imap_fetch_body()

imap_do_fetch_msg()

imap_do_fetch()

imap_command_loop()

Thread B – SMTP DATA (receiving mail)

smtp_data()

smtp_command_loop()

CtdlReadMessageBodyBuf()

StrBufTCP_read_buffered_line_fast()

Thread C – SMTP Forwarding / Queue Delivery

smtp_attempt_delivery()

smtp_do_queue()

smtp_do_queue_full()

curl_easy_perform()

curl_multi_poll()

Additional Concurrent Activity

* TLS handshakes (CtdlStartTLS, imaps_greeting, pop3s_greeting)

* Session cleanup and hooks (PerformSessionHooks, do_housekeeping)

* In some crashes, XMPP hooks are also active

Analysis / Suspected Root Cause

Based on repeated core dump analysis:

These execution paths share internal buffers/message structures
Some of these paths appear not to be fully thread-safe
Increased outbound SMTP concurrency (introduced by Sieve forwarding) significantly raises the likelihood of these paths overlapping
This results in memory corruption, eventually causing a SIGSEGV (often observed shortly after read(), select(), or buffer handling)

Important notes:

The Sieve rules themselves are valid and correctly defined
The issue is not caused by user error or misconfiguration
Forwarding acts as a trigger, not the root defect

Reproduction Pattern (High-Level)

While not 100% deterministic, the crash frequency increases significantly when:

Sieve forwarding is enabled for active mailboxes
Inbound SMTP traffic is present
Users fetch messages (IMAP FETCH) concurrently
SMTP queue delivery runs in parallel (especially to external domains)

Reducing worker thread concurrency significantly reduces or eliminates crashes, which further suggests a concurrency-related issue.

Expected Behaviour

Citadel should be able to safely handle concurrent:

IMAP FETCH
SMTP DATA
SMTP forwarding (Sieve)
SMTP queue delivery

without memory corruption or segmentation faults.

Questions for the Development Team

Is this a known concurrency issue?
Has this behaviour been addressed in newer Citadel versions?
Are there recommended patches, configuration flags, or build options to mitigate this safely?
Would additional debugging data (full core dumps, symbols, logs) be helpful?

Thank you for your time and for maintaining Citadel.

root@tpc-co-cit02:/# gdb /usr/local/citadel/citserver /citadel-data/server1-backup/core.7

GNU gdb (Debian 10.1-1.7) 10.1.90.20210103-git

License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

This is free software: you are free to change and redistribute it.

There is NO WARRANTY, to the extent permitted by law.

Type "show copying" and "show warranty" for details.

This GDB was configured as "x86_64-linux-gnu".

Type "show configuration" for configuration details.

For bug reporting instructions, please see:

<https://www.gnu.org/software/gdb/bugs/>.

Find the GDB manual and other documentation resources online at:

<http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".

Type "apropos word" to search for commands related to "word"...

Reading symbols from /usr/local/citadel/citserver...

(No debugging symbols found in /usr/local/citadel/citserver)

[New LWP 69]

[New LWP 18]

[New LWP 116]

[New LWP 113]

[New LWP 7]

[New LWP 105]

[New LWP 15]

[New LWP 92]

[New LWP 120]

[New LWP 10]

[New LWP 67]

[New LWP 597]

[New LWP 11]

[Thread debugging using libthread_db enabled]

Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

Core was generated by `citserver -x9 -h /citadel-data'.

Program terminated with signal SIGSEGV, Segmentation fault.

#0 0x0000561e86ca5f3f in imap_fetch_body ()

[Current thread is 1 (Thread 0x7f280bfff700 (LWP 69))]

(gdb) set pagination off

(gdb) thread apply all bt full

Thread 13 (Thread 0x7f28225c7700 (LWP 11)):

#0 0x00007f2825d27a0f in __GI___poll (fds=0x7f28225bf870, nfds=2, timeout=1000) at ../sysdeps/unix/sysv/linux/poll.c:29

__arg2 = <optimized out>

_a3 = 1000

_a1 = 139810351872112

resultvar = <optimized out>

__arg3 = <optimized out>

__arg1 = <optimized out>

_a2 = 2

resultvar = <optimized out>

sc_cancel_oldtype = <optimized out>

sc_ret = <optimized out>

#1 0x00007f2825e75bca in ?? () from /usr/lib/x86_64-linux-gnu/libcurl.so.4

No symbol table info available.

#2 0x00007f2825e6abcc in ?? () from /usr/lib/x86_64-linux-gnu/libcurl.so.4

No symbol table info available.

#3 0x00007f2825e6ad56 in curl_multi_poll () from /usr/lib/x86_64-linux-gnu/libcurl.so.4

No symbol table info available.

#4 0x00007f2825e439cf in curl_easy_perform () from /usr/lib/x86_64-linux-gnu/libcurl.so.4

No symbol table info available.

#5 0x0000561e86cc32c5 in smtp_attempt_delivery ()

No symbol table info available.

#6 0x0000561e86cc38f2 in smtp_process_one_msg ()

No symbol table info available.

#7 0x0000561e86cc3f33 in smtp_do_queue ()

No symbol table info available.

#8 0x0000561e86cc3fbf in smtp_do_queue_full ()

No symbol table info available.

#9 0x0000561e86c87e13 in PerformSessionHooks ()

No symbol table info available.

#10 0x0000561e86c73dd5 in do_housekeeping ()

No symbol table info available.

#11 0x0000561e86c8a952 in worker_thread ()

No symbol table info available.

#12 0x00007f2825fd1ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477

ret = <optimized out>

pd = <optimized out>

unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139810351904512, -5926168278360471484, 140734826778382, 140734826778383, 139810351902080, 8396800, 6021948088529373252, 6021962115441018948}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}

not_first_call = 0

#13 0x00007f2825d33acf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:71

No locals.

#14 0x0000000000000000 in ?? ()

No symbol table info available.

Thread 12 (Thread 0x7f2808ff9700 (LWP 597)):

#0 0x00007f2825d29ec3 in __GI___select (nfds=59, readfds=0x7f2808ff8bf0, writefds=0x0, exceptfds=0x0, timeout=0x7f2808ff8be0) at ../sysdeps/unix/sysv/linux/select.c:41

__arg3 = 0

_a5 = 139809926384608

_a2 = 139809926384624

__arg4 = 0

__arg1 = 59

_a3 = 0

resultvar = <optimized out>

__arg5 = 139809926384608

__arg2 = 139809926384624

_a4 = 0

_a1 = 59

resultvar = <optimized out>

sc_cancel_oldtype = -514

sc_ret = <optimized out>

#1 0x0000561e86c8a447 in worker_thread ()

No symbol table info available.

#2 0x00007f2825fd1ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477

ret = <optimized out>

pd = <optimized out>

unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139809926387456, -5926168278360471484, 140734826778382, 140734826778383, 139809926385024, 139809977318912, 6021898356029311044, 6021962115441018948}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}

not_first_call = 0

#3 0x00007f2825d33acf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:71

No locals.

#4 0x0000000000000000 in ?? ()

No symbol table info available.

Thread 11 (Thread 0x7f2820dbc700 (LWP 67)):

#0 __libc_read (nbytes=8191, buf=0x7f2810130b10, fd=33) at ../sysdeps/unix/sysv/linux/read.c:26

resultvar = 18446744073709551104

sc_cancel_oldtype = 0

__arg3 = <optimized out>

_a2 = <optimized out>

sc_ret = <optimized out>

__value = <optimized out>

__arg1 = <optimized out>

_a3 = <optimized out>

resultvar = <optimized out>

__arg2 = <optimized out>

_a1 = <optimized out>

#1 __libc_read (fd=33, buf=0x7f2810130b10, nbytes=8191) at ../sysdeps/unix/sysv/linux/read.c:24

No locals.

#2 0x00007f2825fffed6 in StrBufTCP_read_buffered_line_fast (Line=0x7f28100fe740, IOBuf=0x7f28000dfb30, Pos=0x7f28000a36e0, fd=0x7f28000a3728, timeout=5, selectresolution=<optimized out>, Error=0x7f2820dba9a0) at lib/stringbuf.c:4317

pche = <optimized out>

pos = <optimized out>

pLF = 0x0

len = <optimized out>

rlen = <optimized out>

retlen = 19

nSuccessLess = 0

rfds = {fds_bits = {0, 524288, 126, 32783, 524336, 8192, 35390530551809, 541165879534, 128, 579820586075, 1024, 16, 131072, 4096, 524288, 978326477955633920}}

pch = <optimized out>

fdflags = <optimized out>

IsNonBlock = 0

tv = {tv_sec = 32767, tv_usec = 7}

#3 0x0000561e86c89cbb in CtdlClientGetLine ()

No symbol table info available.

#4 0x0000561e86c81944 in CtdlReadMessageBodyBuf ()

No symbol table info available.

#5 0x0000561e86cc1847 in smtp_data ()

No symbol table info available.

#6 0x0000561e86cc2227 in smtp_command_loop ()

No symbol table info available.

#7 0x0000561e86c8a8a7 in worker_thread ()

No symbol table info available.

#8 0x00007f2825fd1ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477

ret = <optimized out>

pd = <optimized out>

unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139810326693632, -5926168278360471484, 140734826778382, 140734826778383, 139810326691200, 8396800, 6021951441288218692, 6021962115441018948}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}

not_first_call = 0

#9 0x00007f2825d33acf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:71

No locals.

#10 0x0000000000000000 in ?? ()

No symbol table info available.

Thread 10 (Thread 0x7f2822dc8700 (LWP 10)):

#0 0x00007f2825d29ec3 in __GI___select (nfds=59, readfds=0x7f2822dc7bf0, writefds=0x0, exceptfds=0x0, timeout=0x7f2822dc7be0) at ../sysdeps/unix/sysv/linux/select.c:41

__arg3 = 0

_a5 = 139810360294368

_a2 = 139810360294384

__arg4 = 0

__arg1 = 59

_a3 = 0

resultvar = <optimized out>

__arg5 = 139810360294368

__arg2 = 139810360294384

_a4 = 0

_a1 = 59

resultvar = <optimized out>

sc_cancel_oldtype = -514

sc_ret = <optimized out>

#1 0x0000561e86c8a447 in worker_thread ()

No symbol table info available.

#2 0x00007f2825fd1ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477

ret = <optimized out>

pd = <optimized out>

unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139810360297216, -5926168278360471484, 140734826778382, 140734826778383, 139810360294784, 8396800, 6021946989554616388, 6021962115441018948}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}

not_first_call = 0

#3 0x00007f2825d33acf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:71

No locals.

#4 0x0000000000000000 in ?? ()

No symbol table info available.

Thread 9 (Thread 0x7f28097fa700 (LWP 120)):

#0 0x00007f2825d29ec3 in __GI___select (nfds=59, readfds=0x7f28097f9bf0, writefds=0x0, exceptfds=0x0, timeout=0x7f28097f9be0) at ../sysdeps/unix/sysv/linux/select.c:41

__arg3 = 0

_a5 = 139809934777312

_a2 = 139809934777328

__arg4 = 0

__arg1 = 59

_a3 = 0

resultvar = <optimized out>

__arg5 = 139809934777312

__arg2 = 139809934777328

_a4 = 0

_a1 = 59

resultvar = <optimized out>

sc_cancel_oldtype = -514

sc_ret = <optimized out>

#1 0x0000561e86c8a447 in worker_thread ()

No symbol table info available.

#2 0x00007f2825fd1ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477

ret = <optimized out>

pd = <optimized out>

unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139809934780160, -5926168278360471484, 140734826778382, 140734826778383, 139809934777728, 139810111629120, 6021901655101065284, 6021962115441018948}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}

not_first_call = 0

#3 0x00007f2825d33acf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:71

No locals.

#4 0x0000000000000000 in ?? ()

No symbol table info available.

Thread 8 (Thread 0x7f280b7fe700 (LWP 92)):

#0 0x00007f2825d29ec3 in __GI___select (nfds=59, readfds=0x7f280b7fdbf0, writefds=0x0, exceptfds=0x0, timeout=0x7f280b7fdbe0) at ../sysdeps/unix/sysv/linux/select.c:41

__arg3 = 0

_a5 = 139809968348128

_a2 = 139809968348144

__arg4 = 0

__arg1 = 59

_a3 = 0

resultvar = <optimized out>

__arg5 = 139809968348128

__arg2 = 139809968348144

_a4 = 0

_a1 = 59

resultvar = <optimized out>

sc_cancel_oldtype = -514

sc_ret = <optimized out>

#1 0x0000561e86c8a447 in worker_thread ()

No symbol table info available.

#2 0x00007f2825fd1ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477

ret = <optimized out>

pd = <optimized out>

unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139809968350976, -5926168278360471484, 140734826778382, 140734826778383, 139809968348544, 139810110988112, 6021897259202037828, 6021962115441018948}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}

not_first_call = 0

#3 0x00007f2825d33acf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:71

No locals.

#4 0x0000000000000000 in ?? ()

No symbol table info available.

Thread 7 (Thread 0x7f2821dbe700 (LWP 15)):

#0 __libc_read (nbytes=63, buf=0x7f27e4122af0, fd=57) at ../sysdeps/unix/sysv/linux/read.c:26

resultvar = 18446744073709551104

sc_cancel_oldtype = 0

__arg3 = <optimized out>

_a2 = <optimized out>

sc_ret = <optimized out>

__value = <optimized out>

__arg1 = <optimized out>

_a3 = <optimized out>

resultvar = <optimized out>

__arg2 = <optimized out>

_a1 = <optimized out>

#1 __libc_read (fd=57, buf=0x7f27e4122af0, nbytes=63) at ../sysdeps/unix/sysv/linux/read.c:24

No locals.

#2 0x00007f2825fffed6 in StrBufTCP_read_buffered_line_fast (Line=0x7f2818078d50, IOBuf=0x7f27ec0fc8b0, Pos=0x7f27e4079ec0, fd=0x7f27e4079f08, timeout=5, selectresolution=<optimized out>, Error=0x7f2821dbc9a0) at lib/stringbuf.c:4317

pche = <optimized out>

pos = <optimized out>

pLF = 0x0

len = <optimized out>

rlen = <optimized out>

retlen = 0

nSuccessLess = 0

rfds = {fds_bits = {1, 139810178072704, 511, 7, 0, 8192, 139809775419499, 527, 8240, 128, 755914244609, 532575944816, 2, 511101108331, 16, 0}}

pch = <optimized out>

fdflags = <optimized out>

IsNonBlock = 0

tv = {tv_sec = 139810343471552, tv_usec = 139810409532778}

#3 0x0000561e86c89cbb in CtdlClientGetLine ()

No symbol table info available.

#4 0x0000561e86c81944 in CtdlReadMessageBodyBuf ()

No symbol table info available.

#5 0x0000561e86cc1847 in smtp_data ()

No symbol table info available.

#6 0x0000561e86cc2227 in smtp_command_loop ()

No symbol table info available.

#7 0x0000561e86c8a8a7 in worker_thread ()

No symbol table info available.

#8 0x00007f2825fd1ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477

ret = <optimized out>

pd = <optimized out>

unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139810343479040, -5926168278360471484, 140734826778382, 140734826778383, 139810343476608, 139810111003408, 6021953643532699716, 6021962115441018948}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}

not_first_call = 0

#9 0x00007f2825d33acf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:71

No locals.

#10 0x0000000000000000 in ?? ()

No symbol table info available.

Thread 6 (Thread 0x7f280affd700 (LWP 105)):

#0 __libc_read (nbytes=8191, buf=0x7f280018baf0, fd=56) at ../sysdeps/unix/sysv/linux/read.c:26

resultvar = 18446744073709551104

sc_cancel_oldtype = 0

__arg3 = <optimized out>

_a2 = <optimized out>

sc_ret = <optimized out>

__value = <optimized out>

__arg1 = <optimized out>

_a3 = <optimized out>

resultvar = <optimized out>

__arg2 = <optimized out>

_a1 = <optimized out>

#1 __libc_read (fd=56, buf=0x7f280018baf0, nbytes=8191) at ../sysdeps/unix/sysv/linux/read.c:24

No locals.

#2 0x00007f2825fffed6 in StrBufTCP_read_buffered_line_fast (Line=0x7f2800053fc0, IOBuf=0x7f281c090d00, Pos=0x7f281c0f7440, fd=0x7f281c0f7488, timeout=5, selectresolution=<optimized out>, Error=0x7f280affb9a0) at lib/stringbuf.c:4317

pche = <optimized out>

pos = <optimized out>

pLF = 0x0

len = <optimized out>

rlen = <optimized out>

retlen = 20

nSuccessLess = 0

rfds = {fds_bits = {0, 262144, 125, 16399, 262192, 4096, 17798344491009, 139810409524331, 64, 545460847195, 512, 8, 131072, 4096, 262144, 978326477955633920}}

pch = <optimized out>

fdflags = <optimized out>

IsNonBlock = 0

tv = {tv_sec = 16383, tv_usec = 7}

#3 0x0000561e86c89cbb in CtdlClientGetLine ()

No symbol table info available.

#4 0x0000561e86c81944 in CtdlReadMessageBodyBuf ()

No symbol table info available.

#5 0x0000561e86cc1847 in smtp_data ()

No symbol table info available.

#6 0x0000561e86cc2227 in smtp_command_loop ()

No symbol table info available.

#7 0x0000561e86c8a8a7 in worker_thread ()

No symbol table info available.

#8 0x00007f2825fd1ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477

ret = <optimized out>

pd = <optimized out>

unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139809959958272, -5926168278360471484, 140734826778382, 140734826778383, 139809959955840, 139810044056768, 6021893960130283588, 6021962115441018948}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}

not_first_call = 0

#9 0x00007f2825d33acf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:71

No locals.

#10 0x0000000000000000 in ?? ()

No symbol table info available.

Thread 5 (Thread 0x7f2822f2d980 (LWP 7)):

#0 0x00007f2825cfa241 in __GI___clock_nanosleep (clock_id=0, flags=0, req=0x7fff615b8fd0, rem=0x0) at ../sysdeps/unix/sysv/linux/clock_nanosleep.c:48

sc_cancel_oldtype = <optimized out>

sc_ret = <optimized out>

r = <optimized out>

#1 0x00007f2825cffa23 in __GI___nanosleep (requested_time=0x0, remaining=0x0) at nanosleep.c:27

ret = <optimized out>

#2 0x0000000000000000 in ?? ()

No symbol table info available.

Thread 4 (Thread 0x7f280a7fc700 (LWP 113)):

#0 __libc_read (nbytes=5, buf=0x7f27f403a183, fd=47) at ../sysdeps/unix/sysv/linux/read.c:26

resultvar = 18446744073709551104

sc_cancel_oldtype = 0

__arg3 = <optimized out>

_a2 = <optimized out>

sc_ret = <optimized out>

__value = <optimized out>

__arg1 = <optimized out>

_a3 = <optimized out>

resultvar = <optimized out>

__arg2 = <optimized out>

_a1 = <optimized out>

#1 __libc_read (fd=47, buf=0x7f27f403a183, nbytes=5) at ../sysdeps/unix/sysv/linux/read.c:24

No locals.

#2 0x00007f28260f35e5 in ?? () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1

No symbol table info available.

#3 0x00007f28260ee7fa in ?? () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1

No symbol table info available.

#4 0x00007f28260ed6a4 in ?? () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1

No symbol table info available.

#5 0x00007f28260edc73 in BIO_read () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1

No symbol table info available.

#6 0x00007f2826346771 in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1

No symbol table info available.

#7 0x00007f282634a982 in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1

No symbol table info available.

#8 0x00007f28263482c0 in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1

No symbol table info available.

#9 0x00007f282637b499 in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1

No symbol table info available.

#10 0x00007f2826370f75 in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1

No symbol table info available.

#11 0x0000561e86c9667f in CtdlStartTLS ()

No symbol table info available.

#12 0x0000561e86c8806f in CtdlModuleStartCryptoMsgs ()

No symbol table info available.

#13 0x0000561e86caf4d1 in imaps_greeting ()

No symbol table info available.

#14 0x0000561e86c8a88a in worker_thread ()

No symbol table info available.

#15 0x00007f2825fd1ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477

ret = <optimized out>

pd = <optimized out>

unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139809951565568, -5926168278360471484, 140734826778382, 140734826778383, 139809951563136, 139810044037136, 6021895056957556804, 6021962115441018948}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}

not_first_call = 0

#16 0x00007f2825d33acf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:71

No locals.

#17 0x0000000000000000 in ?? ()

No symbol table info available.

Thread 3 (Thread 0x7f2809ffb700 (LWP 116)):

#0 __libc_read (nbytes=5, buf=0x7f27ec0d8873, fd=60) at ../sysdeps/unix/sysv/linux/read.c:26

resultvar = 18446744073709551104

sc_cancel_oldtype = 0

__arg3 = <optimized out>

_a2 = <optimized out>

sc_ret = <optimized out>

__value = <optimized out>

__arg1 = <optimized out>

_a3 = <optimized out>

resultvar = <optimized out>

__arg2 = <optimized out>

_a1 = <optimized out>

#1 __libc_read (fd=60, buf=0x7f27ec0d8873, nbytes=5) at ../sysdeps/unix/sysv/linux/read.c:24

No locals.

#2 0x00007f28260f35e5 in ?? () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1

No symbol table info available.

#3 0x00007f28260ee7fa in ?? () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1

No symbol table info available.

#4 0x00007f28260ed6a4 in ?? () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1

No symbol table info available.

#5 0x00007f28260edc73 in BIO_read () from /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1

No symbol table info available.

#6 0x00007f2826346771 in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1

No symbol table info available.

#7 0x00007f282634a982 in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1

No symbol table info available.

#8 0x00007f28263482c0 in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1

No symbol table info available.

#9 0x00007f282637b499 in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1

No symbol table info available.

#10 0x00007f2826370f75 in ?? () from /usr/lib/x86_64-linux-gnu/libssl.so.1.1

No symbol table info available.

#11 0x0000561e86c9667f in CtdlStartTLS ()

No symbol table info available.

#12 0x0000561e86c8806f in CtdlModuleStartCryptoMsgs ()

No symbol table info available.

#13 0x0000561e86cb9de7 in pop3s_greeting ()

No symbol table info available.

#14 0x0000561e86c8a88a in worker_thread ()

No symbol table info available.

#15 0x00007f2825fd1ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477

ret = <optimized out>

pd = <optimized out>

unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139809943172864, -5926168278360471484, 140734826778382, 140734826778383, 139809943170432, 139810111553776, 6021900553978824772, 6021962115441018948}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}

not_first_call = 0

#16 0x00007f2825d33acf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:71

No locals.

#17 0x0000000000000000 in ?? ()

No symbol table info available.

Thread 2 (Thread 0x7f28215bd700 (LWP 18)):

#0 0x0000561e86ccdd8a in xmpp_queue_event ()

No symbol table info available.

#1 0x0000561e86ccc711 in xmpp_logout_hook ()

No symbol table info available.

#2 0x0000561e86c87e13 in PerformSessionHooks ()

No symbol table info available.

#3 0x0000561e86c8bf2e in CtdlUserLogout ()

No symbol table info available.

#4 0x0000561e86c6fe29 in RemoveContext ()

No symbol table info available.

#5 0x0000561e86c70943 in dead_session_purge ()

No symbol table info available.

#6 0x0000561e86c8a94d in worker_thread ()

No symbol table info available.

#7 0x00007f2825fd1ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477

ret = <optimized out>

pd = <optimized out>

unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139810335086336, -5926168278360471484, 140734826778382, 140734826778383, 139810335083904, 8396800, 6021954742507456580, 6021962115441018948}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}

not_first_call = 0

#8 0x00007f2825d33acf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:71

No locals.

#9 0x0000000000000000 in ?? ()

No symbol table info available.

Thread 1 (Thread 0x7f280bfff700 (LWP 69)):

#0 0x0000561e86ca5f3f in imap_fetch_body ()

No symbol table info available.

#1 0x0000561e86ca6cbd in imap_do_fetch_msg ()

No symbol table info available.

#2 0x0000561e86ca6fda in imap_do_fetch ()

No symbol table info available.

#3 0x0000561e86ca7a77 in imap_fetch ()

No symbol table info available.

#4 0x0000561e86cb1c0b in imap_command_loop ()

No symbol table info available.

#5 0x0000561e86c8a8a7 in worker_thread ()

No symbol table info available.

#6 0x00007f2825fd1ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477

ret = <optimized out>

pd = <optimized out>

unwind_buf = {cancel_jmp_buf = {{jmp_buf = {139809976743680, -5926168278360471484, 140734826778382, 140734826778383, 139809976741248, 8396800, 6021896158079797316, 6021962115441018948}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0, canceltype = 0}}}

not_first_call = 0

#7 0x00007f2825d33acf in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:71

No locals.

#8 0x0000000000000000 in ?? ()

No symbol table info available.

(gdb)

[#] Thu Dec 25 2025 07:40:44 UTC from ParanoidDelusions

Well, I feel this wasn't the right room for THAT.

Glad it didn't somehow crash Uncensored.

Anyhow - Merry Christmas, and goodnight. ;)

[#] Thu Dec 25 2025 14:11:44 UTC from Nurb432

It happens sometimes. Newbies don't know. Often times IG will move it.

Thu Dec 25 2025 07:40:44 UTC from ParanoidDelusions

Well, I feel this wasn't the right room for THAT.

Glad it didn't somehow crash Uncensored.

Anyhow - Merry Christmas, and goodnight. ;)

[#] Fri Dec 26 2025 06:43:29 UTC from ParanoidDelusions

Right room. How can developer people be so stupid? I can't code - but I'm not dumb enough to dump this in the lobby.

Maybe it is me.

[#] Fri Dec 26 2025 06:45:41 UTC from ParanoidDelusions

You're nicer than me. I deal with highly educated, industry specific idiots who f'k things up every day and it makes us all pay more. I feel like we should be mean those people.

I struggle with Christian compassion. A lot. Charlie Kirk would be disappointed.

Thu Dec 25 2025 14:11:44 UTC from Nurb432

It happens sometimes. Newbies don't know. Often times IG will move it.

[#] Fri Dec 26 2025 11:55:31 UTC from Nurb432

Most of us do, its not the 1980s anymore. ( really in any industry, not just IT )

I have moved to the attitude of "whatever, let it burn" and go grab a bag of marshmallows.

Fri Dec 26 2025 06:45:41 UTC from ParanoidDelusions

You're nicer than me. I deal with highly educated, industry specific idiots who f'k things up every day and it makes us all pay more.

[#] Sun Dec 28 2025 00:52:39 UTC from IGnatius T Foobar

Right room. How can developer people be so stupid? I can't code
- but I'm not dumb enough to dump this in the lobby.

It's in the right room *now* because I moved it here.

[#] Sun Dec 28 2025 00:55:07 UTC from IGnatius T Foobar

I struggle with Christian compassion. A lot. Charlie Kirk would
be disappointed.

You're not alone. Not by far. It's one of those things we struggle with -- as believers we want to show Christ-like love and compassion, while as humans we want to choke the living shit out of some asshole who desperately deserves it.

Yeah. I struggle with anger sometimes. We aren't all as far along as Charlie was. But we all receive the same measure of grace if we ask for it. And that's pretty darn cool.

[#] Sun Dec 28 2025 01:01:40 UTC from Nurb432

For me its not anger, its facepalm.

And sorry, its the wrong room.

Sun Dec 28 2025 00:55:07 UTC from IGnatius T Foobar

I struggle with Christian compassion. A lot. Charlie Kirk would
be disappointed.

You're not alone. Not by far. It's one of those things we struggle with -- as believers we want to show Christ-like love and compassion, while as humans we want to choke the living shit out of some asshole who desperately deserves it.

Yeah. I struggle with anger sometimes. We aren't all as far along as Charlie was. But we all receive the same measure of grace if we ask for it. And that's pretty darn cool.

[#] Sun Dec 28 2025 22:35:34 UTC from IGnatius T Foobar

And sorry, its the wrong room.

It is. Remember, this isn't just a Citadel forum, it also goes out to everyone who subscribes to the mailing list. So let's take any future discussion on this topic to some other room where we can explore in depth without bothering the people who want to make the most of their Citadel software.

[#] Tue Dec 30 2025 00:41:19 UTC from PanaSonic

Will the "Back" button on the browser in the next WebCit actually work properly, or just be psycho like it is now? :-D

[#] Wed Dec 31 2025 06:26:39 UTC from IGnatius T Foobar

Will the "Back" button on the browser in the next WebCit
actually work properly, or just be psycho like it is now? :-D

WebCit-NG is going to be a whole different ballgame. Since it's a "one page web app" the semantics are different.

I doubt WebCit-classic is going to get any more love in that department.

Uncensored

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