[Bug 83925] i915 driver crashes on "eglCreateContext()" after DRM/GBM calls

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83925

--- Comment #9 from Manuel Bachmann <manuel.bachmann at open.eurogiciel.org> ---
Hi,

Any help on this ?

Found that kernel 3.15 works, but 3.14.9 does not work. I tried to backport or
cherry-pick half of the commits between 3.14.9 and 3.15, but did not help.
There is also a big "bugfix" branch merge
(https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/gpu/drm/i915/i915_gem.c?id=889fa782bf8ebe7c0d0ed0a9429bf43197f0f64e)
which I did not try because it is huge.

We cannot use the latest kernel as-is because it is explicitly disallowed in
our workflow.

For reference, the precise call with leads to the hang is in
"drivers/gpu/drm/i915/i915_gem.c", "i915_gem_set_domain_ioctl()" function, line
1227. Somewhere in or just after "obj = to_intel_bo(drm_gem_object_lookup(dev,
file, args->handle));".

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