[Bug 72917] [HSW] kms_flip hangs the machine

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72917

--- Comment #4 from Ben Widawsky <ben at bwidawsk.net> ---
(In reply to comment #3)
> Subtest flip-vs-panning-vs-hang seems to be the first one to fail. It fails
> on the following line:
> 
> ..Test assertion failure function exec_nop, file kms_flip.c:648:
> Last errno: 5, Input/output error
> Failed assertion: drmIoctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, &execbuf) ==
> 0 
> Subtest flip-vs-panning-vs-hang: FAIL
> 
> On, the Kernel, I see the execbuf IOTCL returning -EIO and printing the
> following message:
> [drm:i915_gem_validate_context], Context 0 tried to submit while banned
> 
> Ben, Mika, any comments on this?

Just making sure, that backtrace only showed up once, but you always get the
test failure, correct?

The backtrace is likely to hit after a GPU hang, and somewhat benign as longs
as the execbuf is resubmitted.

Possible to bisect?

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