[Bug 1652486] Re: mesa gpu lockup

[undefined]

after rebuilding mesa with the patch applied and installing the
resulting packages (specifically libgl1-mesa-dri:i386 as i traced the
change code/function through the build process to that package and tf2
is i386 even on amd64, but also dependencies and associated packages)
tf2 no longer prompts a gpu lockup (even after hours of game play, where
it use to occur within 10 minutes).

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Title:
  mesa gpu lockup

Status in mesa package in Ubuntu:
  New

Bug description:
  package: mesa
  version: 11.2.0-1ubuntu2.2
  release: 16.04.1 / "Xenial"

  references:
  * https://bugs.freedesktop.org/show_bug.cgi?id=93649
  * https://cgit.freedesktop.org/mesa/mesa/commit/?id=6dc96de3

  symptoms:
  1. kernel reports "GPU lockup"
  2. kernel reports "GPU softreset"
  3. immediately frozen display
  4. eventual "INFO: task (kworker|Xorg)[/:0-9]+ blocked for more than 120 seconds."
  5. computer hanging on system reboot requiring a forced power off

  Symptoms occur when playing Team Fortress 2.

  Attachments:
  1. mesa source package patch
  2. lspci output for video card (ie Radeon HD 7750)
  3. kernel log

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