linux-kernel - Re: [PATCH 25/20] sysfs: Only support removing emtpy sysfs directories.

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Date:	Mon, 25 May 2009 13:45:14 +0200
From:	Kay Sievers <kay.sievers@...y.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	linux-fsdevel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...stanetworks.com>
Subject: Re: [PATCH 25/20] sysfs: Only support removing emtpy sysfs 
	directories.

On Mon, May 25, 2009 at 04:06, Alan Stern <stern@...land.harvard.edu> wrote:

> This looks like a bug I found almost two weeks ago.  The bug was
> introduced by Arjan as part of his async conversion (the async routine
> runs without acquiring one of the mutexes held by its caller).  The
> result is a race in the sd driver -- no connection with USB,

Ah, I see.

> by the way -- so it's a little difficult to trigger.

I can trigger it pretty reliable now on plain -rc7 , but only with
more hubs in-between the storage device. It usually take less than
10-15 connect/disconnect cycles.

It looks like a serious bug though, after the bug triggered, random,
likely unrelated, applications crash, and I can not cleanly shot down
anymore.

> I posted a patch, but the
> reporter never said whether or not the patch fixed the problem.  Hence
> the patch hasn't been submitted.
>
> Here it is for you to try out.

I'll give it try now.

Kay
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