** Changed in: linux (Ubuntu Focal)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1877394
Title:
Kernel panic due to NULL ringbuffer vaddr dereference in i915
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Focal:
Fix Committed
Bug description:
SRU Justification:
[Impact]
A sauce fix for a kernel panic in i915 that I frequently experienced was
fixed by upstream.
[Fix]
The sauce patch I made should be dropped in exchange for the proper upstream
fix.
[Test]
I tested the upstream fix and can confirm it fixes the crashes I experienced.
[Regression Potential]
Low. The upstream fix for this bug is tiny and we get to remove a nasty sauce
patch.
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This is what the crash looks like:
BUG: unable to handle page fault for address: 0000000000003448
RIP: 0010:gen8_emit_flush_render+0x163/0x190
Call Trace:
execlists_request_alloc+0x25/0x40
__i915_request_create+0x1f4/0x2c0
i915_request_create+0x71/0xc0
i915_gem_do_execbuffer+0xb98/0x1a80
? preempt_count_add+0x68/0xa0
? _raw_spin_lock+0x13/0x30
? _raw_spin_unlock+0x16/0x30
i915_gem_execbuffer2_ioctl+0x1de/0x3c0
? i915_gem_busy_ioctl+0x7f/0x1d0
? i915_gem_execbuffer_ioctl+0x2d0/0x2d0
drm_ioctl_kernel+0xb2/0x100
drm_ioctl+0x209/0x360
? i915_gem_execbuffer_ioctl+0x2d0/0x2d0
ksys_ioctl+0x87/0xc0
__x64_sys_ioctl+0x16/0x20
do_syscall_64+0x4e/0x150
entry_SYSCALL_64_after_hwframe+0x44/0xa9
This bug was fixed by "UBUNTU: SAUCE: drm/i915: Synchronize active and
retire callbacks" but there is an upstream fix for it, "drm/i915/gt:
Make intel_ring_unpin() safe for concurrent pint". Let's replace the
sauce patch with the upstream fix.
More info here: https://gitlab.freedesktop.org/drm/intel/issues/1599
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