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From: Jens Axboe <jaxboe@fusionio.com>
To: Tejun Heo <htejun@gmail.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Maciej Rutecki <maciej.rutecki@gmail.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Kernel Testers List <kernel-testers@vger.kernel.org>,
	Network Development <netdev@vger.kernel.org>,
	Linux ACPI <linux-acpi@vger.kernel.org>,
	Linux PM List <linux-pm@lists.linux-foundation.org>,
	Linux SCSI List <linux-scsi@vger.kernel.org>,
	Linux Wireless List <linux-wireless@vger.kernel.org>,
	DRI <dri-devel@lists.freedesktop.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	"stable@kernel.org" <stable@kernel.org>
Subject: Re: [PATCH RESEND block#for-2.6.36] block_dev: always serialize exclusive open attempts
Date: Thu, 5 Aug 2010 11:02:43 +0200	[thread overview]
Message-ID: <4C5A7E33.3060101@fusionio.com> (raw)
In-Reply-To: <4C598E6B.7050405@gmail.com>

On 2010-08-04 17:59, Tejun Heo wrote:
> bd_prepare_to_claim() incorrectly allowed multiple attempts for
> exclusive open to progress in parallel if the attempting holders are
> identical.  This triggered BUG_ON() as reported in the following bug.
> 
>   https://bugzilla.kernel.org/show_bug.cgi?id=16393
> 
> __bd_abort_claiming() is used to finish claiming blocks and doesn't
> work if multiple openers are inside a claiming block.  Allowing
> multiple parallel open attempts to continue doesn't gain anything as
> those are serialized down in the call chain anyway.  Fix it by always
> allowing only single open attempt in a claiming block.
> 
> This problem can easily be reproduced by adding a delay after
> bd_prepare_to_claim() and attempting to mount two partitions of a
> disk.
> 
> stable: only applicable to v2.6.35
> 
> Signed-off-by: Tejun Heo <tj@kernel.org>
> Reported-by: Markus Trippelsdorf <markus@trippelsdorf.de>
> Cc: stable@kernel.org

Thanks Tejun, applied.

-- 
Jens Axboe


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  reply	other threads:[~2010-08-05  9:16 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-08-01 13:46 2.6.35-rc6-git6: Reported regressions from 2.6.34 Rafael J. Wysocki
2010-08-01 18:01 ` Linus Torvalds
2010-08-01 21:37   ` Rafael J. Wysocki
2010-08-02 16:32   ` Tejun Heo
2010-08-04 15:40     ` [PATCH block#for-2.6.36] block_dev: always serialize exclusive open attempts Tejun Heo
2010-08-04 15:59     ` [PATCH RESEND " Tejun Heo
2010-08-05  9:02       ` Jens Axboe [this message]
2010-08-05  9:17         ` Markus Trippelsdorf
2010-08-05  9:20           ` Jens Axboe
2010-08-01 19:39 ` 2.6.35-rc6-git6: Reported regressions from 2.6.34 Larry Finger

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