dovecot - Dec 2010 - deliver -m causes crash: Panic: stream doesn't support seeking backwards

When exim runs deliver -m and tries to write to a directory that does
not exist is causes a crash which stops the exim MTA.


Dec  9 23:20:38 mailhost exim: [ID 197553 mail.info] 2010-12-09 23:20:38
1PQpmu-0007O9-OD <= dovecot-bounces+user=domain.co.uk at dovecot.org
H=dovecot.org [62.236.108.70] P=esmtp S=2714 id=1291936811.2991.135.camel at
kurkku.sapo.corppt.com
Dec  9 23:20:38 localhost spamd[7995]: prefork: child states: II
Dec  9 23:20:38 mailhost dovecot: [ID 583609 mail.info] lda(user at
domain.co.uk): msgid=<1291936811.2991.135.camel at
kurkku.sapo.corppt.com>: save failed to Dovecot: Mailbox doesn't exist:
Dovecot
Dec  9 23:20:38 mailhost dovecot: [ID 583609 mail.crit] lda(user at
domain.co.uk): Panic: stream doesn't support seeking backwards
Dec  9 23:20:38 mailhost dovecot: [ID 583609 mail.error] lda(user at
domain.co.uk): Error: Raw backtrace: 0xff13ca0c -> 0xff146f88 ->
0xff144700 -> 0xff1472fc -> 0xff1442f4 -> 0xff146314 -> 0xff1466c4
-> 0xff1442f4 -> 0xff148d9c -> 0xff1442f4 -> 0xff144b94 ->
0xff15284c -> 0xff1526c4 -> 0xff0568cc -> 0xff01c7b4 -> 0xff01c850
-> 0xff1cb1b4 -> 0xff0260d0 -> 0xff385470 -> 0x132ac -> 0x11f40
Dec  9 23:20:38 mailhost exim: [ID 197553 mail.info] 2010-12-09 23:20:38
1PQpmu-0007O9-OD ** |/opt/xxxx/libexec/dovecot/deliver -d user at domain.co.uk
-m Dovecot (user at domain.co.uk) <user at domain.co.uk> R=userforward
T=address_pipe: Child process of address_pipe transport (running command
"/opt/xxxx/libexec/dovecot/deliver -d user at domain.co.uk -m
Dovecot") was terminated by signal 6 (Abort)
Dec  9 23:20:38 mailhost exim: [ID 197553 mail.info] 2010-12-09 23:20:38
1PQpmw-0007OL-B2 <= <> R=1PQpmu-0007O9-OD U=exim P=local S=3731



When run from the command line syslog reports:
    save failed to missing: Mailbox doesn't exist: missing
    saved mail to INBOX
(no crash)


Exceeding quotas also cause a "Panic: stream doesn't support seeking
backwards" and a crash as reported elsewhere. 

Dovecot 2.0.7
Exim 4.72



James.

On Fri, 2010-12-10 at 11:00 +0000, James Lee wrote:
> Dec  9 23:20:38 mailhost dovecot: [ID 583609 mail.crit] lda(user at
domain.co.uk): Panic: stream doesn't support seeking backwards
Fixed now: http://hg.dovecot.org/dovecot-2.0/rev/89936539e3b8

It also doesn't happen if you enable Sieve plugin.