[Dovecot] Errors on high load

[Timo Sirainen]

On Tue, 2008-09-16 at 10:34 -0300, Allan Cassaro wrote:
> Hi, always when my server is on high load I saw this errors on logs:
> 
> curie:~# uptime
> 10:22:38 up 19 days, 19:19,  2 users,  load average: 207.01, 169.27, 94.41
> 
> Sep 15 17:00:26 curie dovecot: imap-login: *** glibc detected ***
> imap-login: malloc(): memory corruption: 0x00000000009f8560 ***
> Sep 15 17:00:26 curie dovecot: child 24012 (login) killed with signal 6
> Sep 15 18:48:36 curie dovecot: auth(default_with_listener): BUG:
> Authentication client said it's PID 0
> Sep 15 18:48:36 curie dovecot: child 24014 (login) killed with signal 11
> Sep 16 09:05:19 curie dovecot: imap-login: *** glibc detected ***
> imap-login: malloc(): memory corruption: 0x00000000008c4bc0 ***
> Sep 16 09:05:19 curie dovecot: child 24013 (login) killed with signal 6
> Sep 16 10:17:14 curie dovecot: imap-login: *** glibc detected ***
> imap-login: malloc(): memory corruption: 0x000000000098bb30 ***
> Sep 16 10:17:14 curie dovecot: child 24015 (login) killed with signal 6
> Sep 16 10:19:02 curie dovecot: child 24002 (login) killed with signal 6
> Sep 16 10:19:02 curie dovecot: managesieve-login: *** glibc detected
> *** managesieve-login: double free or corruption (!prev):

These are pretty scary. If a user could cause these on will, it could
mean a remotely exploitable security hole. But I've not been able to
produce such crashes for a long time now and I haven't heard it
happening with other people either. You sure the server's memory is OK?
Another thing I could blame instead of Dovecot is OpenSSL :)

> Sep 16 10:19:18 curie dovecot: Panic: IMAP(geduardo): file
> maildir-save.c: line 241 (maildir_get_updated_filename): assertion
> failed: (ctx->keywords_sync_ctx != NULL || mf->keywords_count == 0)

This I fixed recently though:
http://hg.dovecot.org/dovecot-1.1/rev/2922490759c9
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