linux-kernel - Re: PROBLEM: i915 causes complete desktop freezes in 4.15-rc5

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Message-ID: <20180102213922.zu4bbovphbk6sad6@D-69-91-141-110.dhcp4.washington.edu>
Date:   Tue, 2 Jan 2018 16:39:22 -0500
From:   Alexandru Chirvasitu <achirvasub@...il.com>
To:     Chris Wilson <chris@...is-wilson.co.uk>
Cc:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        intel-gfx@...ts.freedesktop.org,
        kernel list <linux-kernel@...r.kernel.org>
Subject: Re: PROBLEM: i915 causes complete desktop freezes in 4.15-rc5

Attached. Crashed quite a bit faster than before this time.

It always seems to have something to do with opening and alt-tabbing
between windows. This time what produced the crash was an attempt to
open a new terminal.

The hanging happened right after issuing the keyboard shortcut, before
the focus had time to switch to the newly-opened terminal window.

Still unable to crash it reliably though, so there's no telling how
promptly I can produce these.




On Tue, Jan 02, 2018 at 04:53:45PM +0000, Chris Wilson wrote:
> Quoting Alexandru Chirvasitu (2018-01-01 21:13:57)
> > All right, we're in business with the new dmesg: It hung again, with a
> > 4.15-rc6 kernel with kasan support.
> > 
> > The new dmesg is attached; the trace is longer now, as you expected.
> 
> Ok, still the same poison but kasan didn't report a use-after-free. Odd.
> 
> Can you disable CONFIG_SLAB_MERGE_DEFAULT and try again? This will stop
> anyone else from overwriting the i915_dependency.
> -Chris

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