linux-kernel - Re: KASAN + general protection fault while writing to mmc

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Date:   Tue, 22 Aug 2017 17:52:31 +0200
From:   Seraphime Kirkovski <kirkseraph@...il.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: KASAN + general protection fault while writing to mmc

On Tue, Aug 22, 2017 at 02:17:38PM +0200, Linus Walleij wrote:
 
> commit 67e69d5220c904238f94bb2e6001d7c590f5a0bb
> Author: Linus Walleij <linus.walleij@...aro.org>
> Date:   Fri May 19 15:37:27 2017 +0200
> 
>     mmc: block: remove req back pointer
> 
>     Just as we can use blk_mq_rq_from_pdu() to get the per-request
>     tag we can use blk_mq_rq_to_pdu() to get a request from a tag.
>     Introduce a static inline helper so we are on the clear what
>     is happening.
> 
>     Suggested-by: Christoph Hellwig <hch@....de>
>     Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
>     Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
> 
> Can you try reverting it and see if the problem goes away?
> 
> Yours,
> Linus Walleij

Thanks for the reply !

The problem doesn't go away, it is only delayed.

Will try to find some time to bisect it.

Thanks,
Seraphime Kirkovski