On August 19, 2016 at 10:00 PM Ladislav Laska <laska@kam.mff.cuni.cz> wrote:
Hi!
I'm currently experiencing a crash of dovecot 2.2.25 on Gentoo, upon opening mailbox. The crash only triggers on opening inbox, other mailboxes seem to work fine. It happens every time, and can be reproduced on request. I also briefly tried 2.2.19, and it behaves the same.
The bug seems to be triggered by some mail, as I encountered it previously and fixed by removing some spam. I guess it might be malformed header of some kind.
I can open the mailbox locally using mutt, but fail to do so remotely (using mutt or K-9 mail on android). Unforunately, I haven't been able to isolate the specific mail, as when I create a new mailbox, dovecot refuses to open it:[CANNOT] Mailbox isn't a valid mbox file (0.000 + 0.000 secs).
I'm not really sure what's going on and will investigate further once I find some time to do so.
I also experienced a similar problem on opening a specific mail, but it's much harder to reproduce and I currently don't have an example. The crash looks very similar, and only happens on first attempt to open a specific mail, it always works later on.
I'm attaching a stack trace and dovecot -n. I'm also willing to send the binary and core dump, but not publicly, as I'm not eager to share whatever's inside with the whole world.
Other than what I mentioned, I'm running pretty standard setup, with postfix on Gentoo x86_64, ext4 fs, quota and disk space is plentiful. The delivery agent is dovecot itself, in postfix/main.cf I have:
mailbox_command = /usr/libexec/dovecot/deliver
I'm using sieve script to file my mail, but the problem manifested even before when I was still using procmail to deliver my mail (I migrated because I had doubts about procmail and dovecot lock cooperation)
I'll keep my mailbox corrupted for a few more days, and access the mail only locally, hoping to test a potential fix. Let me know if you need any more info/experimentation. Also, if you know a good way to find the mail that causes the trouble out of the core, let me know, I'd be glad to forward it for testing.
Thanks and I hope we can find (and fix) the problem!
-- S pozdravem Ladislav Láska <laska@kam.mff.cuni.cz> Katedra Aplikované Matematiky, MFF UK tel.: +420 739 464 167
Hi!
Please provide
doveconf -n
relevant log files (or at least anything you care to share)
gdb /path/to/binary /path/to/core bt full
Aki Tuomi Dovecot Oy