[Bug 1006738] Re: php5-fpm segfaults with error 4 in libc-2.15.so

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** Branch linked: lp:ubuntu/php5

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Title:
  php5-fpm segfaults with error 4 in libc-2.15.so

Status in PHP: Hypertext Preprocessor:
  Unknown
Status in “php5” package in Ubuntu:
  Fix Released
Status in “php5” source package in Precise:
  In Progress

Bug description:
  [Impact]

  [Fix]

  [Test Case]

  [Regression Potential]

  [Original Report]

  On Ubuntu Server 12.04 on amd64 (Intel Xeon E5620 CPU) php5-fpm
  randomly crashes with the following message:

  May 29 06:38:25 srv2 kernel: [315922.148835] php5-fpm[20902]: segfault at 0 ip 00007fecd9032558 sp 00007fff18136898 error 4 in libc-2.15.so[7fecd8f00000+1b3000]
  May 29 06:38:25 srv2 kernel: [315922.148849] php5-fpm/20902: potentially unexpected fatal signal 11.
  May 29 06:38:25 srv2 kernel: [315922.148851]
  May 29 06:38:25 srv2 kernel: [315922.148853] CPU 7
  May 29 06:38:25 srv2 kernel: [315922.148854] Modules linked in: vesafb psmouse i7core_edac edac_core ioatdma dca serio_raw joydev mac_hid lp parport usbhid hid e1000e megaraid_sas
  May 29 06:38:25 srv2 kernel: [315922.148870]
  May 29 06:38:25 srv2 kernel: [315922.148873] Pid: 20902, comm: php5-fpm Not tainted 3.2.0-24-generic #39-Ubuntu Supermicro X8DTT-H/X8DTT-H
  May 29 06:38:25 srv2 kernel: [315922.148878] RIP: 0033:[<00007fecd9032558>]  [<00007fecd9032558>] 0x7fecd9032557
  May 29 06:38:25 srv2 kernel: [315922.148884] RSP: 002b:00007fff18136898  EFLAGS: 00010206
  May 29 06:38:25 srv2 kernel: [315922.148887] RAX: 0000000000000000 RBX: 00007fecdb38b000 RCX: 0000000000000011
  May 29 06:38:25 srv2 kernel: [315922.148890] RDX: 0000000000000066 RSI: 0000000000af8af5 RDI: 0000000000000000
  May 29 06:38:25 srv2 kernel: [315922.148892] RBP: 00000000023cc228 R08: 0000000000000011 R09: 0000000000000000
  May 29 06:38:25 srv2 kernel: [315922.148895] R10: 00007fecd9035750 R11: 00007fecd9081710 R12: 0000000000000001
  May 29 06:38:25 srv2 kernel: [315922.148897] R13: 0000000000000000 R14: 0000000000000000 R15: 00000000023cc2f0
  May 29 06:38:25 srv2 kernel: [315922.148901] FS:  00007fecdb382700(0000) GS:ffff8803332e0000(0000) knlGS:0000000000000000
  May 29 06:38:25 srv2 kernel: [315922.148904] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  May 29 06:38:25 srv2 kernel: [315922.148906] CR2: 0000000000000000 CR3: 0000000327434000 CR4: 00000000000006e0
  May 29 06:38:25 srv2 kernel: [315922.148909] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  May 29 06:38:25 srv2 kernel: [315922.148912] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
  May 29 06:38:25 srv2 kernel: [315922.148915] Process php5-fpm (pid: 20902, threadinfo ffff88032aeec000, task ffff88032aa55bc0)
  May 29 06:38:25 srv2 kernel: [315922.148917]
  May 29 06:38:25 srv2 kernel: [315922.148919] Call Trace:

  GDB information:

  Core was generated by `php-fpm: pool mypool                                      '.
  Program terminated with signal 11, Segmentation fault.
  #0  __strstr_sse42 (s1=0x0, s2=<optimized out>) at ../sysdeps/x86_64/multiarch/strstr.c:175
  175	../sysdeps/x86_64/multiarch/strstr.c: No such file or directory.
  (gdb) bt
  #0  __strstr_sse42 (s1=0x0, s2=<optimized out>) at ../sysdeps/x86_64/multiarch/strstr.c:175
  #1  0x0000000000736d13 in fpm_status_handle_request () at /build/buildd/php5-5.3.10/sapi/fpm/fpm/fpm_status.c:128
  #2  0x000000000042b4ab in main (argc=11237155, argv=0x0) at /build/buildd/php5-5.3.10/sapi/fpm/fpm/fpm_main.c:1809

  # uname -a
  Linux srv2 3.2.0-24-generic #39-Ubuntu SMP Mon May 21 16:52:17 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
  # dpkg -l |grep php
  ii  php-apc                         3.1.7-1                    APC (Alternative PHP Cache) module for PHP 5
  ii  php5-cli                        5.3.10-1ubuntu3.1          command-line interpreter for the php5 scripting language
  ii  php5-common                     5.3.10-1ubuntu3.1          Common files for packages built from the php5 source
  ii  php5-curl                       5.3.10-1ubuntu3.1          CURL module for php5
  ii  php5-dbg                        5.3.10-1ubuntu3.1          Debug symbols for PHP5
  ii  php5-fpm                        5.3.10-1ubuntu3.1          server-side, HTML-embedded scripting language (FPM-CGI binary)
  ii  php5-gd                         5.3.10-1ubuntu3.1          GD module for php5
  ii  php5-mcrypt                     5.3.5-0ubuntu1             MCrypt module for php5
  ii  php5-memcache                   3.0.6-1                    memcache extension module for PHP5
  ii  php5-mysql                      5.3.10-1ubuntu3.1          MySQL module for php5

  The crash occurs several times per hour and is repeatable on two
  different servers with the same software versions.

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