==> /usr/lib64/apache2/logs/error_log <==
[Sun Mar 25 20:28:31 2007] [info] mod_fcgid: Process manager 14979 stopped
[Sun Mar 25 20:28:37 2007] [emerg] (22)Invalid argument: couldn't grab the accept mutex
[Sun Mar 25 20:28:46 2007] [emerg] (22)Invalid argument: couldn't grab the accept mutex

and the end of strace >

[pid 14976] <... wait4 resumed> [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], WSTOPPED, NULL) = 14979
[pid 14976] --- SIGCHLD (Child exited) @ 0 (0) ---
[pid 14976] brk(0xb10000)               = 0xb10000
[pid 14976] munmap(0x2ab73841b000, 90152) = 0
[pid 14976] close(15)                   = 0
[pid 14976] close(7)                    = 0
[pid 14976] close(6)                    = 0
[pid 14976] close(5)                    = 0
[pid 14976] close(4)                    = 0
[pid 14976] exit_group(0)               = ?
Process 14976 detached
[pid 14981] <... poll resumed> [{fd=22, events=POLLIN, revents=POLLIN|POLLERR|POLLHUP}], 1, 15000) = 1
[pid 14981] read(22, 0xb53b58, 8000)    = -1 ECONNRESET (Connection reset by peer)
[pid 14981] shutdown(22, 1 /* send */)  = -1 ENOTCONN (Transport endpoint is not connected)
[pid 14981] close(22)                   = 0
[pid 14981] read(8, 0x7fff7ca17d0f, 1)  = -1 EAGAIN (Resource temporarily unavailable)
[pid 14981] semop(1441795, 0x2ab72f28df40, 1) = -1 EINVAL (Invalid argument)
[pid 14981] write(2, "[Sun Mar 25 20:28:37 2007] [emer"..., 88) = 88
[pid 14981] exit_group(15)              = ?
Process 14981 detached
<... poll resumed> [{fd=22, events=POLLIN}], 1, 15000) = 0
shutdown(22, 1 /* send */)              = 0
poll([{fd=22, events=POLLIN}], 1, 2000) = 0
close(22)                               = 0
read(8, 0x7fff7ca17d2f, 1)              = -1 EAGAIN (Resource temporarily unavailable)
semop(1441795, 0x2ab72f28df40, 1)       = -1 EINVAL (Invalid argument)
write(2, "[Sun Mar 25 20:28:46 2007] [emer"..., 88) = 88
exit_group(15)                          = ?
Process 15024 detached