php-fpm (5.4.13) takes up all cpu resources

Hi All, I have a strange problem with php-fpm, I checkd lots of document, but I can't fix it. I'm using a Freebsd 91 server to host my website. Nginx and php-fpm 5.4.13 and mysql are using. The hardware of my server is 12Core CPUs, 32G memory 6 HDD used as a Raidz2 array to host website 2 SSD used as a mirror array to host Database After I upgrade from 5.4.11 o 5.4.13, I got below problem. Usually, my system is in below status:(top) last pid: 52977; load averages: 4.70, 4.66, 5.55 301 processes: 2 running, 299 sleeping CPU: 6.5% user, 0.0% nice, 6.3% system, 0.9% interrupt, 86.3% idle Mem: 7029M Active, 11G Inact, 12G Wired, 1076M Cache, 399M Free ARC: 8412M Total, 3190M MFU, 1763M MRU, 624K Anon, 209M Header, 3249M Other Swap: 36G Total, 145M Used, 36G Free PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND 52728 www 1 25 0 150M 35564K accept 13 0:01 5.86% php-fpm 52735 www 1 25 0 150M 35416K accept 16 0:01 5.76% php-fpm 52740 www 1 25 0 150M 37668K accept 14 0:01 5.66% php-fpm 52739 www 1 24 0 150M 36424K accept 12 0:01 5.66% php-fpm 52708 www 1 24 0 150M 36324K accept 10 0:01 5.66% php-fpm 52724 www 1 24 0 150M 37740K select 16 0:01 5.57% php-fpm 52714 www 1 25 0 150M 36952K accept 21 0:01 5.57% php-fpm 52719 www 1 25 0 150M 37252K accept 23 0:01 5.57% php-fpm 52717 www 1 25 0 150M 39004K accept 12 0:01 5.57% php-fpm 52734 www 1 25 0 150M 37720K accept 18 0:01 5.57% php-fpm 52726 www 1 24 0 150M 37308K accept 23 0:01 5.47% php-fpm 52737 www 1 25 0 150M 37832K accept 14 0:01 5.37% php-fpm 52721 www 1 25 0 150M 36548K accept 22 0:01 5.37% php-fpm 52710 www 1 25 0 154M 38792K accept 16 0:01 5.37% php-fpm 52723 www 1 25 0 150M 35768K accept 10 0:01 5.37% php-fpm But sometimes, I found a php-fpm will take up about 25%+ cpu resource, then the cpu usage of php-fpm will get increased one by one. Then php-fpm will take up all CPU resources. Like below: last pid: 54212; load averages: 75.83, 75.55, 75.73 up 3+10:47:39 10:27:53 301 processes: 6 running, 295 sleeping CPU: 6.8% user, 0.0% nice, 95.2% system, 0.7% interrupt, 0.0% idle Mem: 7021M Active, 11G Inact, 12G Wired, 1358M Cache, 561M Free ARC: 8525M Total, 3438M MFU, 1619M MRU, 1866K Anon, 213M Header, 3253M Other Swap: 36G Total, 145M Used, 36G Free PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND 53939 www 1 31 0 150M 33096K accept 22 0:01 28.59% php-fpm 53941 www 1 31 0 154M 38144K accept 20 0:01 28.40% php-fpm 53938 www 1 30 0 150M 32816K accept 3 0:01 27.57% php-fpm 53677 www 1 52 0 150M 28440K accept 2 0:04 26.49% php-fpm 53948 www 1 27 0 150M 28964K accept 19 0:01 24.69% php-fpm 53947 www 1 26 0 150M 29272K accept 8 0:01 24.05% php-fpm 53951 www 1 25 0 150M 31208K accept 17 0:01 23.86% php-fpm 53953 www 1 24 0 150M 35300K accept 15 0:00 23.86% php-fpm 53950 www 1 25 0 150M 28268K accept 2 0:00 23.76% php-fpm 53954 www 1 24 0 150M 35476K accept 19 0:00 23.76% php-fpm 53955 www 1 24 0 150M 31292K accept 21 0:00 23.76% php-fpm 53956 www 1 24 0 150M 34064K accept 19 0:00 23.66% php-fpm 53962 www 1 24 0 150M 33224K CPU9 9 0:00 23.66% php-fpm 53960 www 1 24 0 150M 33548K CPU17 17 0:00 23.66% php-fpm Below is the php-fpm.slow. [01-Apr-2013 16:46:52] WARNING: [pool www] child 96623, script '/web/www/forum.php' (request: "GET /forum.php") executing too slow (30.661218 sec), logging [01-Apr-2013 16:46:52] WARNING: [pool www] child 96620, script '/web/www/forum.php' (request: "GET /forum.php") executing too slow (31.778921 sec), logging [01-Apr-2013 16:46:52] NOTICE: child 96764 stopped for tracing [01-Apr-2013 16:46:52] NOTICE: about to trace 96764 [01-Apr-2013 16:46:52] NOTICE: finished trace of 96764 [01-Apr-2013 16:46:52] NOTICE: child 96763 stopped for tracing [01-Apr-2013 16:46:52] NOTICE: about to trace 96763 [01-Apr-2013 16:46:52] ERROR: failed to ptrace(PT_IO) pid 96763: Bad address (14) [01-Apr-2013 16:46:52] NOTICE: finished trace of 96763 [01-Apr-2013 16:46:52] NOTICE: child 96762 stopped for tracing [01-Apr-2013 16:46:52] NOTICE: about to trace 96762 [01-Apr-2013 16:46:52] NOTICE: finished trace of 96762 [01-Apr-2013 16:46:52] NOTICE: child 96761 stopped for tracing [01-Apr-2013 16:46:52] NOTICE: about to trace 96761 The only way to fix this issue is to restart php-fpm. At first, I though it's a mysql error, but I monitorred mysql process, and I found that there is no slowlog. I tried to reinstall php, but this issue still exist. Can anyone help on this issue?