linux-kernel - ILK regression: hangs on reboot to Watchdog line, bisected

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Message-ID: <1764429.dgRZ75eoCY@fractal.fi.intel.com>
Date:   Mon, 09 Jan 2017 20:11:01 +0200
From:   Tomi Sarvela <tomi.p.sarvela@...el.com>
To:     Tomas Winkler <tomas.winkler@...el.com>,
        linux-kernel@...r.kernel.org
Cc:     intel-gfx-ci@...ists.intel.com
Subject: ILK regression: hangs on reboot to Watchdog line, bisected

Hello there,

Our Iron Lake testhosts stopped rebooting at Christmas time. When 
commanding reboot, the last line showing is
[   21.360606] watchdog: watchdog0: watchdog did not stop!
(usually after that comes reboot: Restarting system)

This affects the following hardware:
HP Elite 8100 Small Form Factor (ILK 650)
HP Elitebook 8440p (ILK m540)
IBM ThinkCentre A85 (ILK 650)

Older "Cantiga" hardware isn't affected and reboots as it should, as 
does Pineview and Sandy Bridge.

Bisecting shows that the first bad commit is
----
commit 7279b238badec09efd0545293e64c21feee97f73
Author: Alexander Usyskin <alexander.usyskin@...el.com>
Date:   Thu Nov 10 18:38:57 2016 +0200

    mei: send OS type to the FW
----

If there's something I can do to track this bug down, the hosts are 
usually available for testing.

Best regards,

Tomi Sarvela
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