Public bug reported:

The X internal logging functions use signal-unsafe functions. However,
the server is logging messages while in signal context. This can create
memory and locking corruption.

** Affects: xorg-server (Ubuntu)
     Importance: Medium
     Assignee: Chase Douglas (chasedouglas)
         Status: In Progress

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https://bugs.launchpad.net/bugs/975356

Title:
  Logging from signal context is unsafe

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