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

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Message-ID: <20170906070807.4a4t6udmlbmsaab3@macchiaveli>
Date:   Wed, 6 Sep 2017 09:08:07 +0200
From:   Seraphime Kirkovski <kirkseraph@...il.com>
To:     Adrian Hunter <adrian.hunter@...el.com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Pavel Machek <pavel@....cz>, linux-mmc@...r.kernel.org
Cc:     kernel list <linux-kernel@...r.kernel.org>, O@...chiaveli
Subject: 4.13 on thinkpad x220: oops when writing to SD card

To: Adrian Hunter <adrian.hunter@...el.com>
Cc: Shawn Lin <shawn.lin@...k-chips.com>, Pavel Machek <pavel@....cz>,
	linux-mmc@...r.kernel.org,
	kernel list <linux-kernel@...r.kernel.org>
Bcc: 
Subject: Re: 4.13 on thinkpad x220: oops when writing to SD card
Reply-To: 
In-Reply-To: <6689241f-a4d8-7a3e-9f0b-482b034e5710@...el.com>

Hi,

> > Seems 4.13-rc4 was already broken for that but unfortuantely 
> > I didn't
> > reproduce that. So maybe Seraphime can do git-bisect as he said "I get
> > it everytime" for which I assume it could be easy for him to find out
> > the problematic commit?

I can reliably reproduce it, although sometimes it needs some more work.
For example, I couldn't trigger it while writing less than 1 gigabyte
and sometimes I have to do it more than once. It helps if the machine is
doing something else in meantime, I do kernel builds.

> Another unrelated issue with mmc_init_request() is that 
> mmc_exit_request()
> is not called if mmc_init_request() fails, which means mmc_init_request()
> must free anything it allocates when it fails.

Will try the patch and report back soon.