Reposting my reply from a few days ago to a thread with the same panic
message.
I found this in my logs when some mails that got deleted on the phone
were still visible in roundcube. I currently have three users that
trigger the panic. One user with an iPad accounts for nearly all of the
panics.
The problem shows when the account is accessed from android
(thunderbird) or ipad. The same accounts show no problems when beeing
used with roundcube or thunderbird on windows.
I enabled core dumps on 2026-01-14 and have ~8500 core dumps of the imap
binary until now.
What causes this error and how can I fix it?
In the logs all I see is the users login, then the panic.
# doveconf -n
# 2.4.2-2+debian13 (0962ed2104): /etc/dovecot/dovecot.conf
# Pigeonhole version 2.4.2-2+debian13 (767418c3)
# OS: Linux 6.12.0-custom.kvm x86_64 Debian 13.3 ext4
2026-01-13T21:44:32.317609+01:00 uschi dovecot: imap-login: Logged in:
user=<[email protected]>, method=PLAIN, rip=<IP1>, lip=<IP2>,
mpid=4194077, TLS, session=<cpkID0tId7dUc9rl>
2026-01-13T21:44:38.455379+01:00 uschi dovecot:
imap([email protected])<4194077><cpkID0tId7dUc9rl>: Panic: file
imap-sieve-storage.c: line 216 (imap_sieve_add_mailbox_event): assertion
failed: (ismt->src_box == NULL || ismt->src_box == src_box)
2026-01-13T21:44:38.458755+01:00 uschi dovecot:
imap([email protected])<4194077><cpkID0tId7dUc9rl>: Error: Raw backtrace:
#1 [unw_get_proc_name() failed: -10] -> #2 [unw_get_proc_name() failed:
-10] -> #3 i_panic[0x7f6b6c46c2f6] -> #4 [unw_get_proc_name() failed:
-10] -> #5 [unw_get_proc_name() failed: -10] -> #6 [unw_get_proc_name()
failed: -10] -> #7 mailbox_save_alloc[0x7f6b6ca103c0] -> #8
[unw_get_proc_name() failed: -10] -> #9 command_exec[0x55654e677400] ->
#10 [unw_get_proc_name() failed: -10] -> #11 [unw_get_proc_name()
failed: -10] -> #12 [unw_get_proc_name() failed: -10] -> #13
client_handle_input[0x55654e67ddc0] -> #14
client_continue_pending_input[0x55654e67e0b0] -> #15
io_loop_call_io[0x7f6b6c565490] -> #16
io_loop_handler_run_internal[0x7f6b6c567230] -> #17
io_loop_handler_run[0x7f6b6c5673c0] -> #18 io_loop_run[0x7f6b6c5675a0]
-> #19 master_service_run[0x7f6b6c4b27f0] -> #20 main[0x55654e6688a0] ->
#21 [unw_get_proc_name() failed: -10] -> #22
__libc_start_main[0x7f6b6c234ce0] -> #23 _start[0x55654e668eb0]
2026-01-13T21:44:38.459536+01:00 uschi dovecot:
imap([email protected])<4194077><cpkID0tId7dUc9rl>: Fatal: master:
service(imap): child 4194077 killed with signal 6 (core dumps disabled -
https://dovecot.org/bugreport.html#coredumps)
# coredumpctl dump
PID: 1071230 (imap)
UID: 5000 (vmail)
GID: 5000 (vmail)
Signal: 6 (ABRT)
Timestamp: Fri 2026-01-16 19:17:15 CET (2s ago)
Command Line: $'dovecot/imap [[email protected] <IP redacted> UID
MOVE]'
Executable: /usr/lib/dovecot/imap
Control Group: /system.slice/dovecot.service
Unit: dovecot.service
Slice: system.slice
Boot ID: 3668d179bda340229a780d5d43e426c3
Machine ID: 05698baa30ae984c9bd014566e16da18
Hostname: uschi
Storage:
/var/lib/systemd/coredump/core.imap.5000.3668d179bda340229a780d5d43e426c3.1071230.1768587435000000.zst
(present)
Size on Disk: 1.1M
Message: Process 1071230 (imap) of user 5000 dumped core.
Module libgcc_s.so.1 from deb gcc-14-14.2.0-19.amd64
Module libstdc++.so.6 from deb gcc-14-14.2.0-19.amd64
Module libzstd.so.1 from deb libzstd-1.5.7+dfsg-1.amd64
Stack trace of thread 1071230:
#0 0x00007fbd1ca9f95c n/a (libc.so.6 + 0x9495c)
#1 0x00007fbd1ca4acc2 raise (libc.so.6 + 0x3fcc2)
#2 0x00007fbd1ca334ac abort (libc.so.6 + 0x284ac)
#3 0x00007fbd1cc6caa0 n/a (libdovecot.so.0 + 0x6caa0)
#4 0x00007fbd1cd49e67 n/a (libdovecot.so.0 + 0x149e67)
#5 0x00007fbd1cc6c3d0 i_panic (libdovecot.so.0 +
0x6c3d0)
#6 0x00007fbd1c42f942 n/a (lib95_imap_sieve_plugin.so +
0x4942)
#7 0x00007fbd1c431223 n/a (lib95_imap_sieve_plugin.so +
0x6223)
#8 0x00007fbd1d258f10 n/a (libdovecot-storage.so.0 +
0x11bf10)
#9 0x00007fbd1d1a843b mailbox_save_alloc
(libdovecot-storage.so.0 + 0x6b43b)
#10 0x00005590b7ed4a69 n/a (n/a + 0x0)
ELF object binary architecture: AMD x86-64
--
Christian Kivalo
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