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Date: Sun, 15 Apr 2012 16:32:20 +0100
From: Al Viro <viro@ZenIV.linux.org.uk>
To: Joel Reardon <joel@clambassador.com>
Cc: Artem Bityutskiy <dedekind1@gmail.com>, linux-mtd@lists.infradead.org,
        linux-kernel@vger.kernel.org
Subject: Re: mtdchar kernel oops
Message-ID: <20120415153220.GR6589@ZenIV.linux.org.uk>
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On Sun, Apr 15, 2012 at 01:58:39PM +0200, Joel Reardon wrote:
> I think that this patch:
> "mtdchar: kill persistently held vfsmount"
> http://permalink.gmane.org/gmane.linux.kernel.commits.head/314175
> 
> has started causing kernel oops's when running ubiformat. The oops is
> occuring in fs/namespace.c's mnt_add_count() line:
>         this_cpu_add(mnt->mnt_pcp->mnt_count, n);
> 
> with the stack trace:
> mntget()
> simple_pin_fs()
> mtdchar_open()

Check if commit c65390f4dd49755863f6d772ec538ee4757c08d7
Author: Al Viro <viro@zeniv.linux.org.uk>
Date:   Mon Apr 9 01:36:28 2012 -0400

    fix breakage in mtdchar_open(), sanitize failure exits

has fixed that.

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Date: Sun, 15 Apr 2012 16:32:20 +0100
From: Al Viro <viro@ZenIV.linux.org.uk>
To: Joel Reardon <joel@clambassador.com>
Subject: Re: mtdchar kernel oops
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 Artem Bityutskiy <dedekind1@gmail.com>
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On Sun, Apr 15, 2012 at 01:58:39PM +0200, Joel Reardon wrote:
> I think that this patch:
> "mtdchar: kill persistently held vfsmount"
> http://permalink.gmane.org/gmane.linux.kernel.commits.head/314175
> 
> has started causing kernel oops's when running ubiformat. The oops is
> occuring in fs/namespace.c's mnt_add_count() line:
>         this_cpu_add(mnt->mnt_pcp->mnt_count, n);
> 
> with the stack trace:
> mntget()
> simple_pin_fs()
> mtdchar_open()

Check if commit c65390f4dd49755863f6d772ec538ee4757c08d7
Author: Al Viro <viro@zeniv.linux.org.uk>
Date:   Mon Apr 9 01:36:28 2012 -0400

    fix breakage in mtdchar_open(), sanitize failure exits

has fixed that.