Weird crash over night with nginx

[Robert Gabriel]

I got some weird crash of nginx in the kernel logs. The problem is I
cant find out why or what happened. It happened I suppose over night.

This is from the kernel log:

nginx[31486]: segfault at c4 ip 080aacb5 sp bfd79b60 error 4 in
nginx[8048000+73000]
nginx[31484]: segfault at c4 ip 080aacb5 sp bfd79b60 error 4 in
nginx[8048000+73000]
nginx[1528]: segfault at c4 ip 080aacb5 sp bfd79bc0 error 4 in
nginx[8048000+73000]
nginx[1568]: segfault at c4 ip 080aacb5 sp bfd79bc0 error 4 in
nginx[8048000+73000]

and from error_log:
2010/03/21 09:42:35 [notice] 31483#0: signal 17 (SIGCHLD) received
2010/03/21 09:42:35 [alert] 31483#0: worker process 31486 exited on
signal 11
2010/03/21 09:42:35 [notice] 31483#0: start worker process 1528
2010/03/21 09:42:35 [notice] 31483#0: signal 29 (SIGIO) received
2010/03/21 09:43:03 [notice] 31483#0: signal 17 (SIGCHLD) received
2010/03/21 09:43:03 [alert] 31483#0: worker process 31484 exited on
signal 11
2010/03/21 09:43:03 [notice] 31483#0: start worker process 1568
2010/03/21 09:43:03 [notice] 31483#0: signal 29 (SIGIO) received
2010/03/21 09:43:09 [notice] 31483#0: signal 17 (SIGCHLD) received
2010/03/21 09:43:09 [alert] 31483#0: worker process 1528 exited on
signal 11
2010/03/21 09:43:09 [notice] 31483#0: start worker process 1582
2010/03/21 09:43:09 [notice] 31483#0: signal 29 (SIGIO) received
2010/03/21 09:45:09 [notice] 31483#0: signal 17 (SIGCHLD) received
2010/03/21 09:45:09 [alert] 31483#0: worker process 1568 exited on
signal 11
2010/03/21 09:45:09 [notice] 31483#0: start worker process 1757
2010/03/21 09:45:09 [notice] 31483#0: signal 29 (SIGIO) received
2010/03/21 12:00:13 [notice] 31483#0: signal 15 (SIGTERM) received,
exiting

Does any one know what could be the issue?
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