linux-kernel - Re: [BUG 5.15-rc3] kernel BUG at drivers/gpu/drm/i915/i915_sw

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Date:   Sat, 2 Oct 2021 08:17:50 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Hugh Dickins <hughd@...gle.com>
Cc:     Daniele Ceraolo Spurio <daniele.ceraolospurio@...el.com>,
        Matt Roper <matthew.d.roper@...el.com>,
        Lucas De Marchi <lucas.demarchi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        Caz Yokoyama <caz.yokoyama@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Matthew Brost <matthew.brost@...el.com>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Subject: Re: [BUG 5.15-rc3] kernel BUG at
 drivers/gpu/drm/i915/i915_sw_fence.c:245!

On Sat, 2 Oct 2021 03:17:29 -0700 (PDT)
Hugh Dickins <hughd@...gle.com> wrote:

> Yes (though bisection doesn't work right on this one): the fix

Interesting, as it appeared to be very reliable. But I didn't do the
"try before / after" on the patch.

> https://lore.kernel.org/lkml/1f955bff-fd9e-d2ee-132a-f758add9e9cb@google.com/
> seems to have got lost in the system: it has not even appeared in
> linux-next yet. I was going to send a reminder later this weekend.
> 
> Here it is again (but edited to replace "__aligned(4)" in the original
> by the official "__i915_sw_fence_call" I discovered afterwards; and
> ignoring recent discussions of where __attributes ought to appear :-)
> 
> 
> [PATCH] drm/i915: fix blank screen booting crashes

Thanks, I added it to my "fixes" patch set that I apply before testing.
It looks to have done the trick, and the kernel boots now.

Tested-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

-- Steve