Ubuntu 13.04 3.0 Mesa 9.3.0-devel (git-aa39054) Running Xonotic benchmark and intel_gpu_top at the same time can cause system to lock up. Have seen issue on Haswell and Ivybridge systems, though Haswell seems to happen faster. Repro: open terminal (local or remote) and run intel_gpu_top -s 100000 (-s sets the sample rate per second. Default is 10000 and 100000 seems to make the lockup happen faster.) Example Xonotic run: ./xonotic-linux64-glx -nohome -benchmarkruns 3 -benchmarkruns_skipfirst -benchmark demos/the-big-keybench +r_glsl 1 +vid_width 1024 +vid_height 768 +exec effects-Ultimate.cfg Symptoms: System lock up. Screen frozen. No response from the system via keyboard, mouse or network. Requires power cycle to restore system operation.
You could probably trigger this lockup without even involving mesa. (using, say, x11perf).
Confirmed. Running intel_gpu_top -s 100000 simultaneously with x11perf -all will lock up the system.
See: http://lists.freedesktop.org/archives/mesa-dev/2013-July/041693.html
Patches on list to fix: https://patchwork.kernel.org/patch/2873011/
intel_gpu_top is wontfix, and Chris pmu support is a bit stalled for now. But since that's a new feature (and we don't really track those in bugzilla) I'll close this.
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