[Bug 539655] Re: nouveau hard lockup in nouveau_gem_ioctl_cpu_fini

[Stefan Bader]

I added hooks to catch ttm_bo_synccpu_write_grab and
ttm_bo_synccpu_write_release as well (including the path they are
called). There seems to be some imbalance there. Though it looks a bit
like plymouth and X alike are going through cpu_prep more often than
they go to cpu_fini...

** Attachment added: "ftrace.nouveau.txt"
   http://launchpadlibrarian.net/41641474/ftrace.nouveau.txt

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nouveau hard lockup in nouveau_gem_ioctl_cpu_fini
https://bugs.launchpad.net/bugs/539655
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