Apache service crashing: AH00144: couldn't grab the accept mutex

Created:

2016-12-18 06:40:46 UTC

Modified:

2017-08-17 11:50:47 UTC

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Apache service crashing: AH00144: couldn't grab the accept mutex

Applicable to:

  • Plesk for Linux

Symptoms

Apache 2.4.10 crashes with the following error:

CONFIG_TEXT: (35)Resource deadlock avoided: AH00144: couldn't grab the accept mutex
[fcgid:warn] [pid 14206] mod_fcgid: process 23611 graceful kill fail, sending SIGKILL
[fcgid:warn] [pid 14206] mod_fcgid: process 22505 graceful kill fail, sending SIGKILL
[core:alert] [pid 23133] AH00050: Child 22989 returned a Fatal error... Apache is exiting!

mpm_prefork mode is used.

Cause

Unknown. Under investigation.

Resolution

  1. Connect to the server using SSH.
  2. Edit /etc/apache2/apache2.conf file setting:

    Mutex posixsem

    instead of

    Mutex file:${APACHE_LOCK_DIR} default

  3. Restart apache service:

    # service apache2 restart

If the issue persists, switch to 'mpm_event' in Plesk > Tools & Settings > Apache Web Server

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