502 Bad Gateway while uploading Plesk license on CloudLinux server: child exited on signal 9 (SIGKILL)

Refers to:

  • Plesk 12.5 for Linux
  • Plesk Onyx for Linux
  • Plesk 12.0 for Linux

Created:

2016-11-16 12:40:57 UTC

Modified:

2017-02-22 08:13:55 UTC

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502 Bad Gateway while uploading Plesk license on CloudLinux server: child exited on signal 9 (SIGKILL)

Symptoms

Uploading .xml license code through Plesk GUI, it gives a 502 bad gateway ' and will not install.

Plesk is installed on the server running CloudLinux.

The following error can be found in /var/log/sw-cp-server/sw-engine.log :

[20-Jan-2015 07:07:52] WARNING: [pool plesk] child 916486 exited on signal 9 (SIGKILL) after 10.786705 seconds from start 
[20-Jan-2015 07:07:52] NOTICE: [pool plesk] child 916938 started

Cause

This is known issue for CloudLinux, which is caused by ptrace block. Details can be obtained in CloudLinux documentation .

This behavior has been confirmed as bug with internal id #PPPM-2446 . It was fixed in Plesk 12.5.

Resolution

For Plesk 12.0, as a workaround set kernel.user_ptrace value to 1

# sysctl kernel.user_ptrace=1
kernel.user_ptrace = 1

Then re-upload the license.

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