[Bug 54226] [snb 3.5] stale semaphore sync seqno (typically as seen on bcs->rcs)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=54226

--- Comment #253 from Samantha McVey <samantham at posteo.net> ---
Chris, I seem to be experiencing this bug in Linux 4.7rc3 on an x220 ThinkPad
with Intel HD 3000 chipset.  I was getting random full system freeze, non
responsive over network.

The main messages before the crash were:
Jun 23 19:11:18 athena kernel: [drm:fw_domains_get [i915]] *ERROR* render:
timed out waiting for forcewake ack request.
Jun 23 19:11:18 athena kernel: [drm:__gen6_gt_wait_for_thread_c0.isra.7 [i915]]
*ERROR* GT thread status wait timed out.

The original crash I haven't been able to reproduce easily but I CAN reproduce
every time a full system lockup running the following intel-gpu-tools tests (I
have not even close to run all the tests though) [**This may or may not be
related to the original crash**]

gem_sync, subtest: bsd2-hang
drv_hangman, subtest: error-state-capture-bit

I do not know if these tests are helpful or related (maybe some are known to
fail? not sure).
I have drm debugging turned on for when I ran those tests. (drm.debug=0x1e
log_buf_len=1M)
I can post logs of the hangs associated with the two tests/subtests and run any
other tests if you desire (with kernel drm debug on), I will wait for the issue
to reappear with the drm debug on before posting that log though.  By the
number of similar bugs you may already have the CALL TRACE and non-debug level
logs.

I know how to patch and am able to compile kernels to test.  The bug effects me
maybe once every 1 or 2 days.  I use XOrg with Glamor.  I have been seeing
these crashes since 4.6 (maybe 4.5 or earlier not sure).

I know how to apply patches and am able to compile drm-next or any patches you
have to see if this issue can be isolated.  Thanks, sorry for the long
response.

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