[Bug 1407990] Re: libapache2-mod-php5 random segmentation faults in zend_stack_push() and zend_hash_find()

Leszek leszek.eljasz at gmail.com
Tue Jan 13 00:30:39 UTC 2015


** Description changed:

  Hello,
  
  I observe random segfaults in PHP running as Apache module. I see
  Segfaults in Apache error log, I have collected multiple core dumps
  which indicate that the crashes happen in zend_stack_push()  or
  zend_hash_find(). It seems that the crash happens at scripts compile
  time since in all the cases, I see the compile_file() function at some
  level of the backtrace.
  
  It is a low traffic website, 30-40 page hits /minute, VM hosted by Digital Ocean. Initially the problem was on Ubuntu 14.04 then in order to exclude hardware errors I spawned another VM that is hosted also in DO but in another region and currently I'm running it on Ubuntu 14.10, segfaults still happen:
  # lsb_release -a
  No LSB modules are available.
  Distributor ID:	Ubuntu
  Description:	Ubuntu 14.10
  Release:	14.10
  Codename:	utopic
  
  Modules loaded by Apache:
  # apachectl -M
  Loaded Modules:
   core_module (static)
   so_module (static)
   watchdog_module (static)
   http_module (static)
   log_config_module (static)
   logio_module (static)
   version_module (static)
   unixd_module (static)
   access_compat_module (shared)
   alias_module (shared)
   auth_basic_module (shared)
   authn_core_module (shared)
   authn_file_module (shared)
   authz_core_module (shared)
   authz_host_module (shared)
   authz_user_module (shared)
   deflate_module (shared)
   dir_module (shared)
   env_module (shared)
   expires_module (shared)
   filter_module (shared)
   headers_module (shared)
   mime_module (shared)
   mpm_prefork_module (shared)
   negotiation_module (shared)
   php5_module (shared)
   rewrite_module (shared)
   setenvif_module (shared)
   status_module (shared)
  
  Modules loaded by PHP:
  # ls -1 /etc/php5/apache2/conf.d/
  10-pdo.ini
  20-curl.ini
  20-gd.ini
  20-json.ini
  20-mysqli.ini
  20-mysql.ini
  20-newrelic.ini
  20-pdo_mysql.ini
  20-readline.ini
  
  Software versions:
+ apache2 2.4.10-1ubuntu1
+ apache2-bin 2.4.10-1ubuntu1
  libapache2-mod-php5 5.5.12+dfsg-2ubuntu4.1
  newrelic-php5 4.17.0.79
  newrelic-php5-common 4.17.0.79
  php5-cli 5.5.12+dfsg-2ubuntu4.1
  php5-common 5.5.12+dfsg-2ubuntu4.1
  php5-curl 5.5.12+dfsg-2ubuntu4.1
  php5-dbg 5.5.12+dfsg-2ubuntu4.1
  php5-dev 5.5.12+dfsg-2ubuntu4.1
  php5-gd 5.5.12+dfsg-2ubuntu4.1
  php5-json 1.3.6-1
  php5-mysql 5.5.12+dfsg-2ubuntu4.1
  php5-readline 5.5.12+dfsg-2ubuntu4.1
  
  Attachments:
  - php.ini
  - phpinfo.html - saved phpinfo()
  - index.php: the php script that is being compiled when the segfaults happen seems to be always the same and it is main wordpress index.php file
  - bt-zen_stack_push.txt - backtrace of segfault from zend_stack_push()
  - bt-zen_hash_find.txt - backtrace of seggault from zend_hash_find()
  
  Let me know if I can provide any more useful info, please.
  
  Cheers,
  Leszek

** Summary changed:

- libapache2-mod-php5 random segmentation faults in zend_stack_push()  and  zend_hash_find()
+ apache2.4 mod-php random segmentation faults in zend_stack_push()  and  zend_hash_find()

** Summary changed:

- apache2.4 mod-php random segmentation faults in zend_stack_push()  and  zend_hash_find()
+ apache2.4 mod-php5.5 random segmentation faults in zend_stack_push()  and  zend_hash_find()

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https://bugs.launchpad.net/bugs/1407990

Title:
  apache2.4 mod-php5.5 random segmentation faults in zend_stack_push()
  and  zend_hash_find()

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