[Bug 91527] 7870 radeon crashes after kernel msg drm:radeon_mn_invalidate_range_start

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91527

--- Comment #5 from JATothrim <jarmo.tiitto at gmail.com> ---
I did more research and I was able to capture full kernel crash dump.

Debugging the crashdump I found that The kernel dies at kernel version v3.18.19
in src lines: drivers/gpu/drm/radeon/radeon_mn.c:75 or
drivers/gpu/drm/radeon/radeon_mn.c:76 on to NULL ptr dereference.
At both code lines the kernel tries to lock a mutex apparently. I don't know
exactly which one fails as I'm no expert debugging x86-64 assembly.

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