linux-kernel - 4.13 on thinkpad x220: oops when writing to SD card

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Message-ID: <20170907104749.p2bk6lejj7tvupor@macchiaveli>
Date:   Thu, 7 Sep 2017 12:47:49 +0200
From:   Seraphime Kirkovski <kirkseraph@...il.com>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Pavel Machek <pavel@....cz>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: 4.13 on thinkpad x220: oops when writing to SD card

> blk_init_allocated_queue() allocates 1 request for flush and 
> 4 requests
> for a memory pool.  The memory pool requests only get used under memory
> pressure.  That is why the error doesn't come up straight away.
This seems correct, I can "trivially" trigger the bug with
a while-malloc loop + firefox.

> Reported-by: Seraphime Kirkovski <kirkseraph@...il.com>
> Fixes: 304419d8a7e92 ("mmc: core: Allocate per-request data using the block layer core")
> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>

As I said, this fixes it for me, you can add

Tested-By: Seraphime Kirkovski <kirkseraph@...il.com>

Although I'm not sure this covers the same bug Pavel encountered.
My kernel doesn't panic, it makes KASAN scream + #GP eventually followed 
by a lockup.

Anyway, thanks for the fix,
Seraphime