Периодически nginx падает.

# uname -a
Linux 2.6.27-server-1mnb #1 SMP Fri Oct 10 14:55:52 EDT 2008 x86_64 Intel(R) Core(TM)2 CPU 6320 @ 1.86GHz GenuineIntel GNU/Linux

# nginx -v
nginx: nginx version: nginx/1.0.0

error_log с опцией debug:

2011/07/01 09:15:49 [debug] 27244#0: worker cycle
2011/07/01 09:15:49 [debug] 27244#0: accept mutex lock failed: 0
2011/07/01 09:15:49 [debug] 27244#0: epoll timer: 500
2011/07/01 09:15:49 [debug] 27244#0: timer delta: 500
2011/07/01 09:15:49 [debug] 27244#0: posted events 0000000000000000
2011/07/01 09:15:49 [debug] 27244#0: worker cycle
2011/07/01 09:15:49 [debug] 27244#0: accept mutex lock failed: 0
2011/07/01 09:15:49 [debug] 27244#0: epoll timer: 500
2011/07/01 09:15:50 [notice] 27243#0: signal 15 (SIGTERM) received, exiting
2011/07/01 09:15:50 [debug] 27243#0: wake up, sigio 0
2011/07/01 09:15:50 [debug] 27243#0: child: 0 27244 e:0 t:0 d:0 r:1 j:0
2011/07/01 09:15:50 [debug] 27243#0: child: 1 27245 e:0 t:0 d:0 r:1 j:0
2011/07/01 09:15:50 [debug] 27244#0: epoll: fd:10 ev:0001 d:0000000000BB55C0
2011/07/01 09:15:50 [debug] 27243#0: child: 2 27248 e:0 t:0 d:0 r:1 j:0
2011/07/01 09:15:50 [debug] 27245#0: epoll: fd:12 ev:0001 d:0000000000BB55C0
2011/07/01 09:15:50 [debug] 27245#0: post event 0000000000BE5578
2011/07/01 09:15:50 [debug] 27245#0: timer delta: 112386
2011/07/01 09:15:50 [debug] 27245#0: posted events 0000000000BE5578
2011/07/01 09:15:50 [debug] 27245#0: posted event 0000000000BE5578
2011/07/01 09:15:50 [debug] 27245#0: delete posted event 0000000000BE5578
2011/07/01 09:15:50 [debug] 27245#0: channel handler
2011/07/01 09:15:50 [debug] 27244#0: channel handler
2011/07/01 09:15:50 [debug] 27244#0: channel: 32
2011/07/01 09:15:50 [debug] 27244#0: channel command: 4
2011/07/01 09:15:50 [debug] 27244#0: channel: -2
2011/07/01 09:15:50 [debug] 27244#0: timer delta: 436
2011/07/01 09:15:50 [debug] 27244#0: posted events 0000000000000000
2011/07/01 09:15:50 [notice] 27244#0: exiting
2011/07/01 09:15:50 [debug] 27245#0: channel: 32
2011/07/01 09:15:50 [debug] 27245#0: channel command: 4
2011/07/01 09:15:50 [debug] 27245#0: channel: -2
2011/07/01 09:15:50 [debug] 27245#0: posted event 0000000000000000
2011/07/01 09:15:50 [notice] 27245#0: exiting
2011/07/01 09:15:50 [debug] 27245#0: flush files
2011/07/01 09:15:50 [debug] 27245#0: run cleanup: 0000000000B88B40
2011/07/01 09:15:50 [debug] 27245#0: cleanup resolver
2011/07/01 09:15:50 [debug] 27245#0: free: 0000000000B62390
2011/07/01 09:15:50 [debug] 27243#0: termination cycle: 50
2011/07/01 09:15:50 [debug] 27243#0: sigsuspend
2011/07/01 09:15:50 [debug] 27248#0: epoll: fd:14 ev:0001 d:0000000000BB55C0
2011/07/01 09:15:50 [notice] 27244#0: signal 15 (SIGTERM) received, exiting
2011/07/01 09:15:50 [debug] 27244#0: flush files
2011/07/01 09:15:50 [debug] 27244#0: run cleanup: 0000000000B88B40
2011/07/01 09:15:50 [debug] 27244#0: cleanup resolver
2011/07/01 09:15:50 [debug] 27244#0: free: 0000000000B62390
2011/07/01 09:15:50 [notice] 27248#0: signal 15 (SIGTERM) received, exiting
2011/07/01 09:15:50 [debug] 27248#0: channel handler
2011/07/01 09:15:50 [debug] 27248#0: channel: 32
2011/07/01 09:15:50 [debug] 27248#0: channel command: 4
2011/07/01 09:15:50 [debug] 27248#0: channel: -2
2011/07/01 09:15:50 [debug] 27248#0: timer delta: 6376
2011/07/01 09:15:50 [debug] 27248#0: posted events 0000000000000000
2011/07/01 09:15:50 [notice] 27248#0: exiting
2011/07/01 09:15:50 [debug] 27244#0: free: 0000000000B60370
2011/07/01 09:15:50 [notice] 27245#0: signal 15 (SIGTERM) received, exiting
2011/07/01 09:15:50 [debug] 27245#0: free: 0000000000B60370
2011/07/01 09:15:50 [debug] 27244#0: free: 0000000000B5B2A0
2011/07/01 09:15:50 [debug] 27244#0: free: 0000000000B5A1E0
2011/07/01 09:15:50 [debug] 27244#0: free: 0000000000B59120
2011/07/01 09:15:50 [debug] 27244#0: free: 0000000000B4A2E0, unused: 0
2011/07/01 09:15:50 [debug] 27244#0: free: 0000000000B5C360, unused: 0
2011/07/01 09:15:50 [debug] 27244#0: free: 0000000000B643B0, unused: 0
2011/07/01 09:15:50 [debug] 27244#0: free: 0000000000B693D0, unused: 0
2011/07/01 09:15:50 [debug] 27244#0: free: 0000000000B6D3E0, unused: 1
2011/07/01 09:15:50 [debug] 27244#0: free: 0000000000B713F0, unused: 2
2011/07/01 09:15:50 [debug] 27244#0: free: 0000000000B75400, unused: 0
2011/07/01 09:15:50 [debug] 27244#0: free: 0000000000B79410, unused: 0
2011/07/01 09:15:50 [debug] 27244#0: free: 0000000000B7D420, unused: 0
2011/07/01 09:15:50 [debug] 27244#0: free: 0000000000B81430, unused: 2
2011/07/01 09:15:50 [debug] 27244#0: free: 0000000000B85440, unused: 0
2011/07/01 09:15:50 [debug] 27244#0: free: 0000000000B89450, unused: 0
2011/07/01 09:15:50 [debug] 27244#0: free: 0000000000B8D460, unused: 0
2011/07/01 09:15:50 [debug] 27244#0: free: 0000000000B91470, unused: 0
2011/07/01 09:15:50 [debug] 27244#0: free: 0000000000B95480, unused: 0
2011/07/01 09:15:50 [debug] 27244#0: free: 0000000000B99490, unused: 0
2011/07/01 09:15:50 [debug] 27244#0: free: 0000000000B9D4A0, unused: 0
2011/07/01 09:15:50 [debug] 27244#0: free: 0000000000BA14B0, unused: 0
2011/07/01 09:15:50 [debug] 27244#0: free: 0000000000BA54C0, unused: 0
2011/07/01 09:15:50 [debug] 27244#0: free: 0000000000BAD4E0, unused: 1192
2011/07/01 09:15:50 [debug] 27244#0: free: 0000000000BB14F0, unused: 12640
2011/07/01 09:15:50 [notice] 27244#0: exit
2011/07/01 09:15:50 [debug] 27245#0: free: 0000000000B5B2A0
2011/07/01 09:15:50 [debug] 27245#0: free: 0000000000B5A1E0
2011/07/01 09:15:50 [debug] 27245#0: free: 0000000000B59120
2011/07/01 09:15:50 [debug] 27245#0: free: 0000000000B4A2E0, unused: 0
2011/07/01 09:15:50 [debug] 27245#0: free: 0000000000B5C360, unused: 0
2011/07/01 09:15:50 [debug] 27245#0: free: 0000000000B643B0, unused: 0
2011/07/01 09:15:50 [debug] 27245#0: free: 0000000000B693D0, unused: 0
2011/07/01 09:15:50 [debug] 27245#0: free: 0000000000B6D3E0, unused: 1
2011/07/01 09:15:50 [debug] 27245#0: free: 0000000000B713F0, unused: 2
2011/07/01 09:15:50 [debug] 27245#0: free: 0000000000B75400, unused: 0
2011/07/01 09:15:50 [debug] 27245#0: free: 0000000000B79410, unused: 0
2011/07/01 09:15:50 [debug] 27245#0: free: 0000000000B7D420, unused: 0
2011/07/01 09:15:50 [debug] 27245#0: free: 0000000000B81430, unused: 2
2011/07/01 09:15:50 [debug] 27245#0: free: 0000000000B85440, unused: 0
2011/07/01 09:15:50 [debug] 27245#0: free: 0000000000B89450, unused: 0
2011/07/01 09:15:50 [debug] 27245#0: free: 0000000000B8D460, unused: 0
2011/07/01 09:15:50 [debug] 27245#0: free: 0000000000B91470, unused: 0
2011/07/01 09:15:50 [debug] 27245#0: free: 0000000000B95480, unused: 0
2011/07/01 09:15:50 [debug] 27245#0: free: 0000000000B99490, unused: 0
2011/07/01 09:15:50 [debug] 27245#0: free: 0000000000B9D4A0, unused: 0
2011/07/01 09:15:50 [debug] 27245#0: free: 0000000000BA14B0, unused: 0
2011/07/01 09:15:50 [debug] 27245#0: free: 0000000000BA54C0, unused: 0
2011/07/01 09:15:50 [debug] 27245#0: free: 0000000000BAD4E0, unused: 1192
2011/07/01 09:15:50 [debug] 27245#0: free: 0000000000BB14F0, unused: 12640
2011/07/01 09:15:50 [notice] 27245#0: exit
2011/07/01 09:15:50 [notice] 27243#0: signal 14 (SIGALRM) received
2011/07/01 09:15:50 [debug] 27243#0: wake up, sigio 4
2011/07/01 09:15:50 [debug] 27243#0: termination cycle: 100
2011/07/01 09:15:50 [debug] 27243#0: sigsuspend
2011/07/01 09:15:50 [notice] 27243#0: signal 17 (SIGCHLD) received
2011/07/01 09:15:50 [notice] 27243#0: cache manager process 27248 exited with code 0
2011/07/01 09:15:50 [debug] 27243#0: wake up, sigio 0
2011/07/01 09:15:50 [debug] 27243#0: reap children
2011/07/01 09:15:50 [debug] 27243#0: child: 0 27244 e:1 t:0 d:0 r:1 j:0
2011/07/01 09:15:50 [debug] 27243#0: child: 1 27245 e:1 t:0 d:0 r:1 j:0
2011/07/01 09:15:50 [debug] 27243#0: child: 2 27248 e:1 t:1 d:0 r:1 j:0
2011/07/01 09:15:50 [debug] 27243#0: pass close channel s:2 pid:27248 to:27244
2011/07/01 09:15:50 [debug] 27243#0: pass close channel s:2 pid:27248 to:27245
2011/07/01 09:15:50 [debug] 27243#0: child: 0 27244 e:1 t:0 d:0 r:1 j:0
2011/07/01 09:15:50 [debug] 27243#0: child: 1 27245 e:1 t:0 d:0 r:1 j:0
2011/07/01 09:15:50 [debug] 27243#0: termination cycle: 100
2011/07/01 09:15:50 [debug] 27243#0: sigsuspend
2011/07/01 09:15:50 [notice] 27243#0: signal 29 (SIGIO) received
2011/07/01 09:15:50 [notice] 27243#0: signal 17 (SIGCHLD) received
2011/07/01 09:15:50 [notice] 27243#0: worker process 27244 exited with code 0
2011/07/01 09:15:50 [notice] 27243#0: worker process 27245 exited with code 0
2011/07/01 09:15:50 [debug] 27243#0: wake up, sigio 4
2011/07/01 09:15:50 [debug] 27243#0: reap children
2011/07/01 09:15:50 [debug] 27243#0: child: 0 27244 e:1 t:1 d:0 r:1 j:0
2011/07/01 09:15:50 [debug] 27243#0: child: 1 27245 e:1 t:1 d:0 r:1 j:0
2011/07/01 09:15:50 [notice] 27243#0: exit
2011/07/01 09:15:50 [debug] 27243#0: close listening 0.0.0.0:7082 #9
2011/07/01 09:15:50 [debug] 27243#0: run cleanup: 0000000000B88B40
2011/07/01 09:15:50 [debug] 27243#0: cleanup resolver
2011/07/01 09:15:50 [debug] 27243#0: free: 0000000000B62390
2011/07/01 09:15:50 [debug] 27243#0: free: 0000000000B60370
2011/07/01 09:15:50 [debug] 27243#0: free: 0000000000B5B2A0
2011/07/01 09:15:50 [debug] 27243#0: free: 0000000000B5A1E0
2011/07/01 09:15:50 [debug] 27243#0: free: 0000000000B59120
2011/07/01 09:15:50 [debug] 27243#0: free: 0000000000B4A2E0, unused: 0
2011/07/01 09:15:50 [debug] 27243#0: free: 0000000000B5C360, unused: 0
2011/07/01 09:15:50 [debug] 27243#0: free: 0000000000B643B0, unused: 0
2011/07/01 09:15:50 [debug] 27243#0: free: 0000000000B693D0, unused: 0
2011/07/01 09:15:50 [debug] 27243#0: free: 0000000000B6D3E0, unused: 1
2011/07/01 09:15:50 [debug] 27243#0: free: 0000000000B713F0, unused: 2
2011/07/01 09:15:50 [debug] 27243#0: free: 0000000000B75400, unused: 0
2011/07/01 09:15:50 [debug] 27243#0: free: 0000000000B79410, unused: 0
2011/07/01 09:15:50 [debug] 27243#0: free: 0000000000B7D420, unused: 0
2011/07/01 09:15:50 [debug] 27243#0: free: 0000000000B81430, unused: 2
2011/07/01 09:15:50 [debug] 27243#0: free: 0000000000B85440, unused: 0
2011/07/01 09:15:50 [debug] 27243#0: free: 0000000000B89450, unused: 0
2011/07/01 09:15:50 [debug] 27243#0: free: 0000000000B8D460, unused: 0
2011/07/01 09:15:50 [debug] 27243#0: free: 0000000000B91470, unused: 0
2011/07/01 09:15:50 [debug] 27243#0: free: 0000000000B95480, unused: 0
2011/07/01 09:15:50 [debug] 27243#0: free: 0000000000B99490, unused: 0
2011/07/01 09:15:50 [debug] 27243#0: free: 0000000000B9D4A0, unused: 0
2011/07/01 09:15:50 [debug] 27243#0: free: 0000000000BA14B0, unused: 0
2011/07/01 09:15:50 [debug] 27243#0: free: 0000000000BA54C0, unused: 0
2011/07/01 09:15:50 [debug] 27243#0: free: 0000000000BAD4E0, unused: 1202
2011/07/01 09:15:50 [debug] 27243#0: free: 0000000000BB14F0, unused: 12640

Система относительно свежая, только ядро старое.