[Dovecot] dovecot-1.2.8 imap crash (with backtrace)

[Timo Sirainen]

On Thu, 2009-12-24 at 11:39 -0500, David Halik wrote:
> Dec 24 10:43:07 gehenna11 dovecot: IMAP(user): 
> /rci/nqu/rci/u1/user/dovecot/.INBOX/dovecot-uidlist: Duplicate file 
> entry at line 4: 
> 1231949492.M325236P5922V03E80009I01B6DCA5_0.gehenna9.rutgers.edu,S=4398:2,S 
> (uid 514 -> 721)
> Dec 24 10:43:08 gehenna11 dovecot: IMAP(user): Maildir 
> /rci/u1/user/Maildir: Expunged message reappeared, giving a new UID (old 
> uid=516, 
> file=1231952516.M164875P24494V03E80009I01B6DCAC_0.gehenna9.rutgers.edu,S=4355:2,S)
> Dec 24 10:44:38 gehenna11 dovecot: IMAP(user): 
> /rci/nqu/rci/u1/user/dovecot/.INBOX/dovecot-uidlist: Duplicate file 
> entry at line 6: 
> 1233524267.M97899P9543V04240006I01B6E908_0.gehenna5.rutgers.edu,S=3039:2,S 
> (uid 517 -> 723)

Wonder if there's a corresponding "Expunged message reappeared, giving a
new UID (old uid=x)" having "Dupliate file entry .. (uid x -> " for each
log line? Meaning that the duplicate file entries are caused by those
reappearing messages? (And the reappearing messages are probably caused
by dentry caching issues.)

> Dec 24 10:44:38 gehenna11 dovecot: IMAP(user): Panic: file 
> maildir-uidlist.c: line 405 (maildir_uidlist_records_array_delete): 
> assertion failed: (pos != NULL)

I couldn't previously really figure out how this could happen, even when
manually causing the "expunged message reappeared" error. Could you do
in gdb something like:

fr 6 (or whatever frame gives usable results)
p *rec
p count
p *recs[0]
p *recs[1]
p *recs[..up until count-1]

If count is large, the main things I want to know are:

1) Is the array sorted (recs[n]->uid < recs[n+1]->uid always)?

2) is rec->uid anywhere in the recs array?

If it complains about values being optimized away, recompile without
-O2. I usually do that by just removing it from
src/lib-storage/index/maildir/Makefile and touch dovecot-uidlist.c and
make + make install.

-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 197 bytes
Desc: This is a digitally signed message part
Url : http://dovecot.org/pipermail/dovecot/attachments/20091229/89814de6/attachment.bin