Здрасьте, наконец-то отловил его, уже такое бывало, но
на продакшене, по этому не получалось бэктрейс глянуть, надо было
быстро все починить. Проявляется при HUP'е:

(gdb) bt
#0 0x0000003744abac77 in sched_yield () from /lib64/libc.so.6
#1 0x0000000000413667 in ngx_spinlock (lock=0x2b1216ba3000, value=14637,
spin=1024) at src/core/ngx_spinlock.c:39
#2 0x00000000004452ad in ngx_http_file_cache_expire (
data=<value optimized out>) at src/http/ngx_http_file_cache.c:1076
#3 ngx_http_file_cache_manager (data=<value optimized out>)
at src/http/ngx_http_file_cache.c:1196
#4 0x000000000041fdba in ngx_cache_manager_process_handler (ev=0x7ffff2bee870)
at src/os/unix/ngx_process_cycle.c:1346
#5 0x000000000041a299 in ngx_event_expire_timers ()
at src/event/ngx_event_timer.c:149
#6 0x000000000041a1c5 in ngx_process_events_and_timers (cycle=0x75f4fb0)
at src/event/ngx_event.c:261
#7 0x0000000000420a88 in ngx_cache_manager_process_cycle (cycle=0x75f4fb0,
data=<value optimized out>) at src/os/unix/ngx_process_cycle.c:1328
#8 0x000000000041e5c7 in ngx_spawn_process (cycle=0x75f4fb0,
proc=0x420919 <ngx_cache_manager_process_cycle>, data=0x67d400,
name=0x46803f "cache manager process", respawn=-4)
at src/os/unix/ngx_process.c:196
#9 0x000000000041f21a in ngx_start_cache_manager_processes (cycle=0x75f4fb0,
respawn=1) at src/os/unix/ngx_process_cycle.c:398
#10 0x00000000004207ee in ngx_master_process_cycle (cycle=0x75f4fb0)
at src/os/unix/ngx_process_cycle.c:251
#11 0x0000000000406b8a in main (argc=12, argv=0x75c9ae9)
at src/core/nginx.c:405

Процесс пока не убиваю, сервер тестовый,
если надо структурки посмотреть, то пожалуйста.

[root@gostats ~]# nginx -V
nginx: nginx version: nginx/0.9.6
nginx: built by gcc 4.1.2 20080704 (Red Hat 4.1.2-48)
nginx: TLS SNI support disabled
nginx: configure arguments: --prefix=/opt/nginx --user=nobody --group=nobody --with-http_image_filter_module --with-http_stub_status_module --with-http_ssl_module --with-http_xslt_module --with-http_geoip_module

[root@gostats ~]# uname -a
Linux gostats.org 2.6.18-194.26.1.el5 #1 SMP Tue Nov 9 12:54:20 EST 2010 x86_64 x86_64 x86_64 GNU/Linux

--
br, Denis F. Latypoff.

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