[BUG] dovecot 2.3.0 - service(lmtp) killed with signal 11 when user is overquota

[Stephan Bosch]

Op 1/17/2018 om 2:22 PM schreef Marco Giunta:
> Hi,
> I'm using dovecot 2.3.0 installed on a new CentOS 7.4 with rpm from
> Dovecot repo. When I use LMTP to deliver an email to an overquota
> user, lmtp service hangs with a segfault:
>
> Jan 17 13:39:45 server-02.example.com kernel: lmtp[5099]: segfault at
> 0 ip 0000563599e372c2 sp 00007ffeaa4fdc80 error 4 in
> lmtp[563599e31000+b000]
> Jan 17 13:39:45 server-02.example.com dovecot[5089]: lmtp(5099):
> Fatal: master: service(lmtp): child 5099 killed with signal 11 (core
> dumped)
>
> If I try to deliver a mail with 'dovecot-lda' on the same overquota
> user, email was rejected, as expected:
>
> Jan 17 13:38:26 server-02.example.com dovecot[6773]:
> lda(USERNAME)<6773><ZbQDO8FDX1p1GgAASpDaHg>: Debug: Mailbox stdin:
> Opened mail UID=1 because: copying
> Jan 17 13:38:26 server-02.example.com dovecot[6773]:
> lda(USERNAME)<6773><ZbQDO8FDX1p1GgAASpDaHg>: msgid=unspecified: save
> failed to INBOX: Quota exceeded (mailbox for user is full)
> Jan 17 13:38:26 server-02.example.com dovecot[6773]:
> lda(USERNAME)<6773><ZbQDO8FDX1p1GgAASpDaHg>: msgid=unspecified:
> rejected: Quota exceeded (mailbox for user is full)
> Jan 17 13:38:26 server-02.example.com dovecot[6773]:
> lda(USERNAME)<6773><ZbQDO8FDX1p1GgAASpDaHg>: msgid=: Return-Path
> missing, rejection reason: Quota exceeded (mailbox for user is full)
>
> If user is no more overquota, LTMP delivery works:
>
> Jan 17 14:13:16 server-02.example.com dovecot[8651]:
> lmtp(USERNAME at example.com)<8665><ZMKmEexLX1rZIQAASpDaHg>: Debug:
> Mailbox <lmtp DATA local>: Opened mail UID=1 because: copying
> Jan 17 14:13:16 server-02.example.com dovecot[8651]:
> lmtp(USERNAME at example.com)<8665><ZMKmEexLX1rZIQAASpDaHg>: Debug:
> INBOX: Mailbox opened because: quota count
> Jan 17 14:13:16 server-02.example.com dovecot[8651]:
> lmtp(USERNAME at example.com)<8665><ZMKmEexLX1rZIQAASpDaHg>: sieve:
> msgid=<151619479629.10128.16766154794856971096 at client.example.com>:
> stored mail into mailbox 'INBOX'
>
> Attached my dovecot configuration and a backtrace from gdb.

Fix pending:

https://github.com/stephanbosch/dovecot-core/tree/fix-lmtp-quota-excess

Regards,

Stephan.