Found problem. Got fix. Tracking as DOV-9596.
Op 8-6-2026 om 21:28 schreef Noah Meyerhans via dovecot:
Forwarded from https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1139275
A certain poison pill message seems to crash sieve-filter. A reproducer
script, email message, and sieve script are at
https://salsa.debian.org/noahm/dovecot/-/tree/sieve-crash/debian/tests/sieve-crash
The problem is not reproducible with 2.4.1, so it seems to be a
regression introduced since then.
Coredump details follow:
root@dovecot-test:/home/noahm/dovecot# coredumpctl info | cat
PID: 110911 (sieve-filter)
TID: 110911 (sieve-filter)
UID: 65534 (nobody)
GID: 65534 (nogroup)
Signal: 6 (ABRT)
Timestamp: Mon 2026-06-08 19:16:37 UTC (29s ago)
Command Line: sieve-filter -u dep8 -e -W -D -C -v
/srv/dovecot-dep8/test.sieve INBOX
Executable: /usr/bin/sieve-filter
Control Group: /user.slice/user-1000.slice/session-5.scope
Unit: session-5.scope
Slice: user-1000.slice
Session: 5
Owner UID: 1000 (noahm)
Boot ID: 46469969e01043559d913ef8ab625856
Machine ID: a497a098bd094c1c8f7c8ed02aa21853
Hostname: dovecot-test
Storage:
/var/lib/systemd/coredump/core.sieve-filter.65534.46469969e01043559d913ef8ab625856.110911.1780946197000000.zst
(present)
Size on Disk: 253.5K
Message: Process 110911 (sieve-filter) of user 65534 dumped core.
Module libgcc_s.so.1 from deb gcc-16-16.1.0-1.amd64
Module libstdc++.so.6 from deb gcc-16-16.1.0-1.amd64
Stack trace of thread 110911:
#0 0x00007fe06b09fcfc n/a (libc.so.6 + 0x97cfc)
#1 0x00007fe06b048d02 raise (libc.so.6 + 0x40d02)
#2 0x00007fe06b0304b2 abort (libc.so.6 + 0x284b2)
#3 0x00007fe06b26ed45 n/a (libdovecot.so.0 + 0x6ed45)
#4 0x00007fe06b357597 default_fatal_handler (libdovecot.so.0
+ 0x157597)
#5 0x00007fe06b26ec72 i_panic (libdovecot.so.0 + 0x6ec72)
#6 0x00007fe06b273b90 n/a (libdovecot.so.0 + 0x73b90)
#7 0x00007fe06b3498fb n/a (libdovecot.so.0 + 0x1498fb)
#8 0x00007fe06b34a784 n/a (libdovecot.so.0 + 0x14a784)
#9 0x00007fe06b34a93b buffer_append (libdovecot.so.0 +
0x14a93b)
#10 0x00007fe06b344cc6 dregex_code_match_groups
(libdovecot.so.0 + 0x144cc6)
#11 0x00007fe06b806a27 n/a (libdovecot-sieve.so.0 + 0x6da27)
#12 0x00007fe06b806cd0 n/a (libdovecot-sieve.so.0 + 0x6dcd0)
#13 0x00007fe06b7ee411 sieve_match_value
(libdovecot-sieve.so.0 + 0x55411)
#14 0x00007fe06b7ee711 sieve_match (libdovecot-sieve.so.0 +
0x55711)
#15 0x00007fe06b7f5862 n/a (libdovecot-sieve.so.0 + 0x5c862)
#16 0x00007fe06b7eccde sieve_interpreter_continue
(libdovecot-sieve.so.0 + 0x53cde)
#17 0x00007fe06b7fbfbe sieve_execute (libdovecot-sieve.so.0 +
0x62fbe)
#18 0x00005638c0022fcf main (sieve-filter + 0x3fcf)
#19 0x00007fe06b031f77 n/a (libc.so.6 + 0x29f77)
#20 0x00007fe06b032027 __libc_start_main (libc.so.6 + 0x2a027)
#21 0x00005638c0023791 _start (sieve-filter + 0x4791)
ELF object binary architecture: AMD x86-64
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