linux-kernel - Re: Regression in 4.11 - PowerPC crashes on boot, bisected to commit 5657933dbb6e

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Message-ID: <1488431644.2870.64.camel@kernel.crashing.org>
Date:   Thu, 02 Mar 2017 16:14:04 +1100
From:   Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:     Larry Finger <Larry.Finger@...inger.net>,
        Bart Van Assche <bart.vanassche@...disk.com>,
        Thorsten Leemhuis <regressions@...mhuis.info>
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: Re: Regression in 4.11 - PowerPC crashes on boot, bisected to
 commit 5657933dbb6e

On Wed, 2017-03-01 at 21:26 -0600, Larry Finger wrote:
> My Powerbook G4 Aluminum generates a fatal splat early in the boot process, just 
> after identifying the driver for the disk. Unfortunately, it turns off almost 
> immediately, thus I cannot report the message. After this bug has been 
> triggered, the system clock has been reset to Dec. 31, 1969. I assume this is a 
> side effect of an uncontrolled DMA operation.
> 
> This problem has been bisected to commit 5657933dbb6e ("treewide: Move dma_ops 
> from struct dev_archdata into struct device").

Side effect of a crash during boot... the PMU gets upset when we crash while
there's a request in flight, that's probably what is happening.

As to why that commit is broken, I don't have time to look into it right  now,
maybe next week of nobody beats me to it.

Cheers,
Ben.