On 20 Aug 2015, at 01:37, Florian Pritz <bluewind@xinu.at> wrote:
Hi,
I'm seeing the following segfault when I run
doveadm search mailbox inboxwith the zlib module enabled with dovecot 2.18 and glibc 2.22 on Arch Linux. It does not happen with glibc 2.21.I've noticed that when I remove "zlib" from the mail_plugins line at the beginning of the config file the segfault goes away. I've also tested hg tip and the problem does not appear to be fixed yet.
The segfault also happens with other commands like
doveadm purge.Do you need any more information to reproduce and fix this?
If it only happens with Arch Linux with an updated glibc version, I doubt the problem is with Dovecot's code.
0x00007ffff5eaf1e0 in pthread_mutex_unlock () from /usr/lib/libpthread.so.0 #0 0x00007ffff5eaf1e0 in pthread_mutex_unlock () from /usr/lib/libpthread.so.0 #1 0x00007ffff7def753 in _dl_close_worker () from /lib64/ld-linux-x86-64.so.2 #2 0x00007ffff7defede in _dl_close () from /lib64/ld-linux-x86-64.so.2 #3 0x00007ffff7dea124 in _dl_catch_error () from /lib64/ld-linux-x86-64.so.2 #4 0x00007ffff6d235e1 in ?? () from /usr/lib/libdl.so.2 #5 0x00007ffff6d230bf in dlclose () from /usr/lib/libdl.so.2 #6 0x00007ffff739326a in module_free (module=0x69da20) at module-dir.c:67
Looks very much like a non-Dovecot bug.
You could verify by running with valgrind, ideally with glibc debuginfo packages installed. It'll likely point to glibc cod.