Package: zsh
Version: 5.9-4+b5
Severity: normal
File: /bin/zsh

Dear Maintainer,

A zsh process dumped core when the login session was ended (likely due
to a failed network connection). Here are the relevant logs:

-----
May 14 17:56:27 host sshd[1733250]: pam_unix(sshd:session): session closed for user
May 14 17:56:27 host systemd-logind[566]: Session 18 logged out. Waiting for processes to exit.
May 14 17:56:27 host kernel: show_signal_msg: 1 callbacks suppressed
May 14 17:56:27 host kernel: zsh[1733257]: segfault at 0 ip 0000558b81d54b3e sp 00007ffc254531f0 error 6 in zsh[558b81cc8000+9a000] likely on CPU 1 (core 0, socket 1)
May 14 17:56:27 host kernel: Code: b6 13 48 8d 41 01 48 83 c3 01 83 f2 20 88 51 01 48 8d 48 01 48 39 de 74 1c 0f b6 13 f6 44 57 01 10 75 d9 48 89 c8 48 83 c3 01 <88> 11 48 8d 48 01 48 39 de 75 e4 c6 01 00 48 83 c4 18 4c 89 e0 5b
May 14 17:56:27 host systemd-coredump[3885063]: Process 1733257 (zsh) of user 1000 dumped core.
May 14 17:56:27 host systemd-logind[566]: Removed session 18.
-----

Here is the relevant coredump info:

PID: 1733257 (zsh)
Signal: 11 (SEGV)
Timestamp: Wed 2025-05-14 17:56:27 PDT
Command Line: -zsh
Executable: /usr/bin/zsh
Control Group: /user.slice/user-1000.slice/session-18.scope
Unit: session-18.scope
Slice: user-1000.slice
Session: 18
Message: Process 1733257 (zsh) of user 1000 dumped core.

Stack trace of thread 1733257:
#0 0x0000558b81d54b3e wcs_nicechar_sel (zsh + 0xa3b3e)
#1 0x0000558b81d59346 mb_niceformat (zsh + 0xa8346)
#2 0x0000558b81d59a2d n/a (zsh + 0xa8a2d)
#3 0x0000558b81d59b5a zerr (zsh + 0xa8b5a)
#4 0x0000558b81d0bf6d update_job (zsh + 0x5af6d)
#5 0x0000558b81d442f4 wait_for_processes (zsh + 0x932f4)
#6 0x0000558b81d43dd5 zhandler (zsh + 0x92dd5)
#7 0x0000558b81d1bbbe zrealloc (zsh + 0x6abbe)
#8 0x0000558b81d54a86 wcs_nicechar_sel (zsh + 0xa3a86)
#9 0x0000558b81d59346 mb_niceformat (zsh + 0xa8346)
#10 0x0000558b81d59a2d n/a (zsh + 0xa8a2d)
#11 0x0000558b81d5a05a zwarn (zsh + 0xa905a)
#12 0x0000558b81cdf47a zexit (zsh + 0x2e47a)
#13 0x0000558b81d43f89 zhandler (zsh + 0x92f89)
#14 0x00007f0b419f7050 n/a (libc.so.6 + 0x3c050)
#15 0x00007f0b419f72d5 __sigsuspend (libc.so.6 + 0x3c2d5)
#16 0x0000558b81d43367 signal_suspend (zsh + 0x92367)
#17 0x0000558b81d0c464 n/a (zsh + 0x5b464)
#18 0x0000558b81d0cc64 waitjobs (zsh + 0x5bc64)
#19 0x0000558b81cec1e2 n/a (zsh + 0x3b1e2)
#20 0x0000558b81ced133 execlist (zsh + 0x3c133)
#21 0x0000558b81d156c4 execif (zsh + 0x646c4)
#22 0x0000558b81ce9895 n/a (zsh + 0x38895)
#23 0x0000558b81ceb5ce n/a (zsh + 0x3a5ce)
#24 0x0000558b81ceb97b n/a (zsh + 0x3a97b)
#25 0x0000558b81ced133 execlist (zsh + 0x3c133)
#26 0x0000558b81d15dc7 execcase (zsh + 0x64dc7)
#27 0x0000558b81ce9895 n/a (zsh + 0x38895)
#28 0x0000558b81ceb5ce n/a (zsh + 0x3a5ce)
#29 0x0000558b81ceb97b n/a (zsh + 0x3a97b)
#30 0x0000558b81ced133 execlist (zsh + 0x3c133)
#31 0x0000558b81d1579b execif (zsh + 0x6479b)
#32 0x0000558b81ce9895 n/a (zsh + 0x38895)
#33 0x0000558b81ceb5ce n/a (zsh + 0x3a5ce)
#34 0x0000558b81ceb97b n/a (zsh + 0x3a97b)
#35 0x0000558b81ced133 execlist (zsh + 0x3c133)
#36 0x0000558b81d1579b execif (zsh + 0x6479b)
#37 0x0000558b81ce9895 n/a (zsh + 0x38895)
#38 0x0000558b81ceb5ce n/a (zsh + 0x3a5ce)
#39 0x0000558b81ceb97b n/a (zsh + 0x3a97b)
#40 0x0000558b81ced133 execlist (zsh + 0x3c133)
#41 0x0000558b81ceda02 execode (zsh + 0x3ca02)
#42 0x0000558b81d03c4a loop (zsh + 0x52c4a)
#43 0x0000558b81d06569 source (zsh + 0x55569)
#44 0x0000558b81ccfb31 bin_dot (zsh + 0x1eb31)
#45 0x0000558b81cd8ed3 execbuiltin (zsh + 0x27ed3)
#46 0x0000558b81ceaec7 n/a (zsh + 0x39ec7)
#47 0x0000558b81ceb5ce n/a (zsh + 0x3a5ce)
#48 0x0000558b81ceb97b n/a (zsh + 0x3a97b)
#49 0x0000558b81ced61f execlist (zsh + 0x3c61f)
#50 0x0000558b81ceda02 execode (zsh + 0x3ca02)
#51 0x0000558b81d03c4a loop (zsh + 0x52c4a)
#52 0x0000558b81d06569 source (zsh + 0x55569)
#53 0x0000558b81d06c32 run_init_scripts (zsh + 0x55c32)
#54 0x0000558b81d07956 zsh_main (zsh + 0x56956)
#55 0x00007f0b419e224a n/a (libc.so.6 + 0x2724a)
#56 0x00007f0b419e2305 __libc_start_main (libc.so.6 + 0x27305)
#57 0x0000558b81cc8d31 _start (zsh + 0x17d31)
ELF object binary architecture: AMD x86-64

Kind regards.


-- Package-specific info:

Packages which provide vendor completions:

Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description +++-================-==================-============-=======================================================
ii curl 7.88.1-10+deb12u12 amd64 command line tool for transferring data with URL syntax
ii etckeeper 1.18.20-1 all store /etc in git, mercurial, brz or darcs
ii systemd 252.36-1~deb12u1 amd64 system and service manager ii systemd-coredump 252.36-1~deb12u1 amd64 tools for storing and retrieving coredumps
ii systemd-resolved 252.36-1~deb12u1 amd64 systemd DNS resolver
ii udev 252.36-1~deb12u1 amd64 /dev/ and hotplug management daemon

dpkg-query: no path found matching pattern /usr/share/zsh/vendor-functions/


-- System Information:
Debian Release: 12.10
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.1.0-34-amd64 (SMP w/2 CPU threads; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages zsh depends on:
ii debianutils 5.7-0.5~deb12u1
ii libc6 2.36-9+deb12u10
ii libcap2 1:2.66-4
ii libtinfo6 6.4-4
ii zsh-common 5.9-4

Versions of packages zsh recommends:
ii libc6 2.36-9+deb12u10
ii libgdbm6 1.23-3
ii libncursesw6 6.4-4
ii libpcre3 2:8.39-15

Versions of packages zsh suggests:
pn zsh-doc <none>

-- no debconf information

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

* Rob Leslie [Thu May 15, 2025 at 12:18:22PM -0700]:

Package: zsh
Version: 5.9-4+b5
Severity: normal
File: /bin/zsh

Dear Maintainer,

A zsh process dumped core when the login session was ended (likely due
to a failed network connection). Here are the relevant logs:

-----
May 14 17:56:27 host sshd[1733250]: pam_unix(sshd:session): session closed for user
May 14 17:56:27 host systemd-logind[566]: Session 18 logged out. Waiting for processes to exit.
May 14 17:56:27 host kernel: show_signal_msg: 1 callbacks suppressed
May 14 17:56:27 host kernel: zsh[1733257]: segfault at 0 ip 0000558b81d54b3e sp 00007ffc254531f0 error 6 in zsh[558b81cc8000+9a000] likely on CPU 1 (core 0, socket 1)
May 14 17:56:27 host kernel: Code: b6 13 48 8d 41 01 48 83 c3 01 83 f2 20 88 51 01 48 8d 48 01 48 39 de 74 1c 0f b6 13 f6 44 57 01 10 75 d9 48 89 c8 48 83 c3 01 <88> 11 48 8d 48 01 48 39 de 75 e4 c6 01 00 48 83 c4 18 4c 89 e0 5b
May 14 17:56:27 host systemd-coredump[3885063]: Process 1733257 (zsh) of user 1000 dumped core.
May 14 17:56:27 host systemd-logind[566]: Removed session 18.
-----

Here is the relevant coredump info:

[...]

Is that reproducible for you somehow?

FTR, there's zsh 5.9-4+b6 with:

| * Binary-only non-maintainer upload for amd64; no source changes.
| * Rebuild for outdated Built-Using (glibc/2.36-9+deb12u5)

And latest Debian point-release 12.11 provides libc6
v2.36-9+deb12u10, wondering whether this would change anything,
assuming that it's even reproducible in some way at all.

regards
-mika-

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--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On May 18, 2025, at 2:09 PM, Michael Prokop <mika@debian.org> wrote:

* Rob Leslie [Thu May 15, 2025 at 12:18:22PM -0700]:

Package: zsh
Version: 5.9-4+b5
Severity: normal
File: /bin/zsh

Dear Maintainer,

A zsh process dumped core when the login session was ended (likely due
to a failed network connection). Here are the relevant logs:

-----
May 14 17:56:27 host sshd[1733250]: pam_unix(sshd:session): session closed for user
May 14 17:56:27 host systemd-logind[566]: Session 18 logged out. Waiting for processes to exit.
May 14 17:56:27 host kernel: show_signal_msg: 1 callbacks suppressed
May 14 17:56:27 host kernel: zsh[1733257]: segfault at 0 ip 0000558b81d54b3e sp 00007ffc254531f0 error 6 in zsh[558b81cc8000+9a000] likely on CPU 1 (core 0, socket 1)
May 14 17:56:27 host kernel: Code: b6 13 48 8d 41 01 48 83 c3 01 83 f2 20 88 51 01 48 8d 48 01 48 39 de 74 1c 0f b6 13 f6 44 57 01 10 75 d9 48 89 c8 48 83 c3 01 <88> 11 48 8d 48 01 48 39 de 75 e4 c6 01 00 48 83 c4 18 4c 89 e0 5b
May 14 17:56:27 host systemd-coredump[3885063]: Process 1733257 (zsh) of user 1000 dumped core.
May 14 17:56:27 host systemd-logind[566]: Removed session 18.
-----

Here is the relevant coredump info:

[...]

Is that reproducible for you somehow?

I can’t say it’s reliably reproducible, however I do have a record of 12 other coredumps across several machines, including one from Debian 11. All have similar stack traces.

FTR, there's zsh 5.9-4+b6 with:

| * Binary-only non-maintainer upload for amd64; no source changes.
| * Rebuild for outdated Built-Using (glibc/2.36-9+deb12u5)

And latest Debian point-release 12.11 provides libc6
v2.36-9+deb12u10, wondering whether this would change anything,
assuming that it's even reproducible in some way at all.

It looks like libc6 2.36-9+deb12u10 was installed on one machine on 2025-03-15 and a coredump followed on 2025-05-17, so that didn’t seem to change anything.

Thanks,
-rob


<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div><blockquote type="cite"><div>On May 18, 2025, at 2:09 PM,
Michael Prokop &lt;mika@debian.org&gt; wrote:</div><br class="Apple-interchange-newline"><div><span style="caret-color: rgb(0, 0, 0); font-family: Inconsolata; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-
spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;">* Rob Leslie [Thu May 15, 2025 at 12:18:
22PM -0700]:</span><br style="caret-color: rgb(0, 0, 0); font-family: Inconsolata; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-
space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><blockquote type="cite" style="font-family: Inconsolata; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal;
orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">Package: zsh<br>Version: 5.9-4+b5<br>Severity: normal<br>File: /bin/
zsh<br><br>Dear Maintainer,<br><br>A zsh process dumped core when the login session was ended (likely due<br>to a failed network connection). Here are the relevant logs:<br><br>-----<br>May 14 17:56:27 host sshd[1733250]: pam_unix(sshd:session): session
closed for user<br>May 14 17:56:27 host systemd-logind[566]: Session 18 logged out. Waiting for processes to exit.<br>May 14 17:56:27 host kernel: show_signal_msg: 1 callbacks suppressed<br>May 14 17:56:27 host kernel: zsh[1733257]: segfault at 0 ip
0000558b81d54b3e sp 00007ffc254531f0 error 6 in zsh[558b81cc8000+9a000] likely on CPU 1 (core 0, socket 1)<br>May 14 17:56:27 host kernel: Code: b6 13 48 8d 41 01 48 83 c3 01 83 f2 20 88 51 01 48 8d 48 01 48 39 de 74 1c 0f b6 13 f6 44 57 01 10 75 d9 48
89 c8 48 83 c3 01 &lt;88&gt; 11 48 8d 48 01 48 39 de 75 e4 c6 01 00 48 83 c4 18 4c 89 e0 5b<br>May 14 17:56:27 host systemd-coredump[3885063]: Process 1733257 (zsh) of user 1000 dumped core.<br>May 14 17:56:27 host systemd-logind[566]: Removed session 18.
<br>-----<br><br>Here is the relevant coredump info:<br></blockquote><span style="caret-color: rgb(0, 0, 0); font-family: Inconsolata; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align:
start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;">[...]</span><br style="caret-color: rgb(0, 0, 0); font-family:
Inconsolata; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-
decoration: none;"><br style="caret-color: rgb(0, 0, 0); font-family: Inconsolata; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-
space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="caret-color: rgb(0, 0, 0); font-family: Inconsolata; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing:
normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;">Is that reproducible for you somehow?</span><br
style="caret-color: rgb(0, 0, 0); font-family: Inconsolata; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-
spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"></div></blockquote><div><br></div><div>I can’t say it’s reliably reproducible, however I do have a record of 12 other coredumps across several machines, including one from Debian
11. All have similar stack traces.</div><br><blockquote type="cite"><div><span style="caret-color: rgb(0, 0, 0); font-family: Inconsolata; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-
align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;">FTR, there's zsh 5.9-4+b6 with:</span><br style="caret-color:
rgb(0, 0, 0); font-family: Inconsolata; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-
text-stroke-width: 0px; text-decoration: none;"><br style="caret-color: rgb(0, 0, 0); font-family: Inconsolata; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px;
text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="caret-color: rgb(0, 0, 0); font-family: Inconsolata; font-size: 14px; font-style: normal; font-variant-caps: normal; font-
weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;">| * Binary-only non-
maintainer upload for amd64; no source changes.</span><br style="caret-color: rgb(0, 0, 0); font-family: Inconsolata; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent:
0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="caret-color: rgb(0, 0, 0); font-family: Inconsolata; font-size: 14px; font-style: normal; font-variant-caps: normal;
font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;">| * Rebuild for
outdated Built-Using (glibc/2.36-9+deb12u5)</span><br style="caret-color: rgb(0, 0, 0); font-family: Inconsolata; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent:
0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><br style="caret-color: rgb(0, 0, 0); font-family: Inconsolata; font-size: 14px; font-style: normal; font-variant-caps: normal;
font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="caret-color: rgb(0, 0, 0); font-family:
Inconsolata; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-
decoration: none; float: none; display: inline !important;">And latest Debian point-release 12.11 provides libc6</span><br style="caret-color: rgb(0, 0, 0); font-family: Inconsolata; font-size: 14px; font-style: normal; font-variant-caps: normal; font-
weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="caret-color: rgb(0, 0, 0); font-family:
Inconsolata; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-
decoration: none; float: none; display: inline !important;">v2.36-9+deb12u10, wondering whether this would change anything,</span><br style="caret-color: rgb(0, 0, 0); font-family: Inconsolata; font-size: 14px; font-style: normal; font-variant-caps:
normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="caret-color: rgb(0, 0, 0); font-
family: Inconsolata; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width:
0px; text-decoration: none; float: none; display: inline !important;">assuming that it's even reproducible in some way at all.</span><br style="caret-color: rgb(0, 0, 0); font-family: Inconsolata; font-size: 14px; font-style: normal; font-variant-caps:
normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"></div></blockquote><div><br></div><div>It looks
like libc6&nbsp;2.36-9+deb12u10 was installed on one machine on&nbsp;2025-03-15 and a coredump followed on&nbsp;2025-05-17, so that didn’t seem to change anything.</div><div><br></div><div>Thanks,</div><div>&nbsp; -rob</div><div><br></div></div></body><
/html>

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

* Rob Leslie [Sun Jun 01, 2025 at 01:07:10PM -0400]:

On May 18, 2025, at 2:09 PM, Michael Prokop <mika@debian.org> wrote:

* Rob Leslie [Thu May 15, 2025 at 12:18:22PM -0700]:

A zsh process dumped core when the login session was ended (likely due
to a failed network connection). Here are the relevant logs:

-----
May 14 17:56:27 host sshd[1733250]: pam_unix(sshd:session): session closed for user
May 14 17:56:27 host systemd-logind[566]: Session 18 logged out. Waiting for processes to exit.
May 14 17:56:27 host kernel: show_signal_msg: 1 callbacks suppressed
May 14 17:56:27 host kernel: zsh[1733257]: segfault at 0 ip 0000558b81d54b3e sp 00007ffc254531f0 error 6 in zsh[558b81cc8000+9a000] likely on CPU 1 (core 0, socket 1)
May 14 17:56:27 host kernel: Code: b6 13 48 8d 41 01 48 83 c3 01 83 f2 20 88 51 01 48 8d 48 01 48 39 de 74 1c 0f b6 13 f6 44 57 01 10 75 d9 48 89 c8 48 83 c3 01 <88> 11 48 8d 48 01 48 39 de 75 e4 c6 01 00 48 83 c4 18 4c 89 e0 5b
May 14 17:56:27 host systemd-coredump[3885063]: Process 1733257 (zsh) of user 1000 dumped core.
May 14 17:56:27 host systemd-logind[566]: Removed session 18.
-----

Here is the relevant coredump info:

[...]

Is that reproducible for you somehow?

I can’t say it’s reliably reproducible, however I do have a record of 12 other coredumps across several machines, including one from Debian 11. All have similar stack traces.

Hm, would be interesting to have steps to reproduce this,
I never observed such a behavior on my own.

FTR, there's zsh 5.9-4+b6 with:

| * Binary-only non-maintainer upload for amd64; no source changes.
| * Rebuild for outdated Built-Using (glibc/2.36-9+deb12u5)

And latest Debian point-release 12.11 provides libc6
v2.36-9+deb12u10, wondering whether this would change anything,
assuming that it's even reproducible in some way at all.

It looks like libc6 2.36-9+deb12u10 was installed on one machine on 2025-03-15 and a coredump followed on 2025-05-17, so that didn’t seem to change anything.

Was the system rebooted in between?
Was the system fully upgraded to what Debian v12 provides?
Do the ~13 occurences you observed so far have anything in common?

regards
-mika-

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--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Jun 1, 2025, at 2:00 PM, Michael Prokop <mika@debian.org> wrote:

FTR, there's zsh 5.9-4+b6 with:

| * Binary-only non-maintainer upload for amd64; no source changes.
| * Rebuild for outdated Built-Using (glibc/2.36-9+deb12u5)

And latest Debian point-release 12.11 provides libc6
v2.36-9+deb12u10, wondering whether this would change anything,
assuming that it's even reproducible in some way at all.

It looks like libc6 2.36-9+deb12u10 was installed on one machine on 2025-03-15 and a coredump followed on 2025-05-17, so that didn’t seem to change anything.

Was the system rebooted in between?
Was the system fully upgraded to what Debian v12 provides?

Yes, the system was fully upgraded and rebooted after each upgrade.

Do the ~13 occurences you observed so far have anything in common?

The only thing I can think is that they were all most likely running a tmux client process (i.e. tmux -u attach -t 1) when they were terminated. All the machines have the byobu package installed and run tmux at login.

If you were to try to reproduce, you could install the byobu package and start it from ~/.zprofile like this:

_byobu_sourced=1 . /usr/bin/byobu-launch 2>/dev/null || true

Then connect to the machine remotely via ssh in a local window and perhaps simulate dropping the connection by closing the window?

Thanks,
-rob

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)