Seems to be fixed in the latest 5.5
http://kobi.wang/v5.x/ChangeLog-5.5
drm/i915: Hold reference to intel_frontbuffer as we track activity
Since obj->frontbuffer is no longer protected by the struct_mutex, as we
are processing the execbuf, it may be removed. Mark the
intel_frontbuffer as rcu protected, and so acquire a reference to
the struct as we track activity upon it.
Closes: https://gitlab.freedesktop.org/drm/intel/issues/827
Fixes: 8e7cb1799b4f ("drm/i915: Extract intel_frontbuffer active tracking")
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
Link:
https://patchwork.freedesktop.org/patch/msgid/20191218104043.3539458-1-ch...@chris-wilson.co.uk
(cherry picked from commit da42104f589d979bbe402703fd836cec60befae1)
I am not sure that is a good idea to ship Ubuntu 20.04 LTS with Linux
Kernel 5.4 branch unless you backport 5.5 patches as many people rely on
bult-in Intel GPU in their workstation and the Intel graphics kernel
driver is not very stable
https://linuxreviews.org/Linux_Kernel_5.5_Will_Not_Fix_The_Frequent_Intel_GPU_Hangs_In_Recent_Kernels
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=949369
https://bugzilla.redhat.com/show_bug.cgi?id=1805278
https://bugs.archlinux.org/task/65392
Google "i915_active_acquire"+"i915_vma_move_to_active"
Google link:https://gitlab.freedesktop.org/drm/intel/issues/827
commit e85ade1f50aae464ce196672faa7a099fd1721ed
Author: Chris Wilson <ch...@chris-wilson.co.uk>
Date: Wed Dec 18 10:40:43 2019 +0000
** Bug watch added: Debian Bug tracker #949369
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=949369
** Bug watch added: Red Hat Bugzilla #1805278
https://bugzilla.redhat.com/show_bug.cgi?id=1805278
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https://bugs.launchpad.net/bugs/1868551
Title:
Screen freezes : NULL pointer dereference i915_active_acquire since
Linux 5.4
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