Mailing List Archive: Segfaults in 3.1.17

Hi,

I have detected segfaults in pop3 and imapd services in my dbmail 3.1.17 (Debian 7) server.

Logs in /var/log/kern.log: Oct 27 10:40:03 dbmail01 kernel: [21722970.963966] dbmail-pop3d[25341] general protection ip:7fb8ad72b80a sp:7fff5bf5f768 error:0 in libdbmail.so.0.0.0[7fb8ad6e7000+6b000] Oct 27 11:16:30 dbmail01 kernel: [21725158.293150] dbmail-pop3d[25262]: segfault at 1fb9 ip 00007f4f7e98e80a sp 00007fffbd2d7c78 error 4 in libdbmail.so.0.0.0[7f4f7e94a000+6b000] Oct 27 14:11:02 dbmail01 kernel: [21735629.206895] dbmail-pop3d[29032] general protection ip:7fe0b4c8080a sp:7fffdf976aa8 error:0 in libdbmail.so.0.0.0[7fe0b4c3c000+6b000] Oct 27 14:17:50 dbmail01 kernel: [21736037.204306] pool[29043]: segfault at 0 ip 00007f1c8471ce20 sp 00007f1c7e368c80 error 4 in libzdb.so.9.0.2[7f1c84714000+1a000] Oct 28 16:18:17 dbmail01 kernel: [21829660.233119] pool[23525]: segfault at 0 ip 00007f1f0eb4de20 sp 00007f1f05f9f690 error 4 in libzdb.so.9.0.2[7f1f0eb45000+1a000] Other posts mention that DoS attacks may be a reason for these crashes, but I am already running APF/BFD/iptables to protect the server in realtime. Dbmail restart is needed in this case. Any clues? Sincerely. Rogerio

Rogerio,

would it be possible to reproduce the segfault using gdb?

gdb /usr/sbin/dbmail-pop3d -D

wait.... until the crash

and post the result of the backtrace (bt).

Or better yet: make sure dbmail can produce a core-dump.

When it does:

gdb /usr/sbin/dbmail-pop3d /tmp/coredump

http://stackoverflow.com/questions/17965/generate-a-core-dump-in-linux

On 29-10-14 15:21, Rogerio Pereira wrote:
> Hi,
>
> I have detected segfaults in pop3 and imapd services in my dbmail 3.1.17
> (Debian 7) server.
>
> Logs in /var/log/kern.log:
>
> Oct 27 10:40:03 dbmail01 kernel: [21722970.963966] dbmail-pop3d[25341]
> general protection ip:7fb8ad72b80a sp:7fff5bf5f768 error:0 in
> libdbmail.so.0.0.0[7fb8ad6e7000+6b000]
> Oct 27 11:16:30 dbmail01 kernel: [21725158.293150] dbmail-pop3d[25262]:
> segfault at 1fb9 ip 00007f4f7e98e80a sp 00007fffbd2d7c78 error 4 in
> libdbmail.so.0.0.0[7f4f7e94a000+6b000]
> Oct 27 14:11:02 dbmail01 kernel: [21735629.206895] dbmail-pop3d[29032]
> general protection ip:7fe0b4c8080a sp:7fffdf976aa8 error:0 in
> libdbmail.so.0.0.0[7fe0b4c3c000+6b000]
> Oct 27 14:17:50 dbmail01 kernel: [21736037.204306] pool[29043]: segfault
> at 0 ip 00007f1c8471ce20 sp 00007f1c7e368c80 error 4 in
> libzdb.so.9.0.2[7f1c84714000+1a000]
> Oct 28 16:18:17 dbmail01 kernel: [21829660.233119] pool[23525]: segfault
> at 0 ip 00007f1f0eb4de20 sp 00007f1f05f9f690 error 4 in
> libzdb.so.9.0.2[7f1f0eb45000+1a000]
>
> Other posts mention that DoS attacks may be a reason for these crashes,
> but I am already running APF/BFD/iptables to protect the server in realtime.
>
> Dbmail restart is needed in this case.
>
> Any clues?
>
> Sincerely.
>
> Rogerio
>
>
>
>
>
> _______________________________________________
> DBmail mailing list
> DBmail@dbmail.org
> http://mailman.fastxs.nl/cgi-bin/mailman/listinfo/dbmail
>

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