php-fpm is very very slow...

[LiuXin]

Hi all,
After upgrade from php 5.3.6 to php 5.3.8, now php-fpm is very very slow. Even I tried to roll back to php 5.3.6, it still doen't work.
And there are lots of errors in php-fpm.log,
  [04-Sep-2011 12:28:27] WARNING: [pool www] child 18793, script '/web/www/forum.php' (request: "GET /forum.php") executing too slow (60.073197 sec), logging
  [04-Sep-2011 12:28:27] WARNING: [pool www] child 18784, script '/web/www/forum.php' (request: "GET /forum.php") executing too slow (60.080807 sec), logging
  [04-Sep-2011 12:28:27] NOTICE: child 18793 stopped for tracing
  [04-Sep-2011 12:28:27] NOTICE: about to trace 18793
  [04-Sep-2011 12:28:27] ERROR: ptrace(PT_IO) failed: Bad address (14)
  [04-Sep-2011 12:28:27] NOTICE: finished trace of 18793
  [04-Sep-2011 12:28:27] NOTICE: child 18784 stopped for tracing
  [04-Sep-2011 12:28:27] NOTICE: about to trace 18784
  [04-Sep-2011 12:28:27] ERROR: ptrace(PT_IO) failed: Bad address (14)
  [04-Sep-2011 12:28:27] NOTICE: finished trace of 18784
And in php-fpm.slow
  [04-Sep-2011 12:27:30] [pool www] pid 18622
  script_filename = /web/www/forum.php
  [0x000000080455aaa8] mysql_query() /web/www/source/class/class_core.php:815
  [0x000000080455a958] query() /web/www/source/class/class_core.php:1003
  [0x000000080455a858] _execute() /web/www/source/class/class_core.php:977
  [0x00000008045591a0] query() /web/www/source/module/forum/forum_viewthread.php:514
  [0x0000000804559058] +++ dump failed
And one can help me about this issue?
My server is running Freebsd 8.1 + nginx + php 5.3.8
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