linux-kernel - Re: Remove easily user-triggerable BUG from generic

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Message-ID: <20120713175030.GA8911@redhat.com>
Date:	Fri, 13 Jul 2012 13:50:31 -0400
From:	Dave Jones <davej@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	"J. Bruce Fields" <bfields@...hat.com>
Subject: Re: Remove easily user-triggerable BUG from generic_setlease

On Fri, Jul 13, 2012 at 10:47:43AM -0700, Linus Torvalds wrote:
 > On Fri, Jul 13, 2012 at 10:35 AM, Dave Jones <davej@...hat.com> wrote:
 > > This can be trivially triggered from userspace by passing in something unexpected.
 > 
 > Argh. It looks like it would be harmless (apart from the noise),
 > except we hold file_lock_lock. Which turns the BUG_ON() into not just
 > "noise and kill the process", but "noise and kill the process and
 > leave a nasty lock held".

Yeah, box wedged shortly afterwards. Not cool.

 > This seems to go back to 3.2, so stable should be cc'd, no?

yeah, definitly. my bad.

	Dave

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