linux-kernel - Re: processes hung after sys_renameat, and 'missing' processes

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Message-ID: <1338802545.28282.11.camel@twins>
Date:	Mon, 04 Jun 2012 11:35:45 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: processes hung after sys_renameat, and 'missing' processes

On Mon, 2012-06-04 at 01:20 +0100, Al Viro wrote:
> 
> Another question re lockdep - does it scream loudly if process returns
> to userland without having released some lock?  I hope so, but I've never
> checked that... ;-/ 

It does, on some archs. git grep lockdep_sys_exit, suggests x86 and
s390.

http://www.google.com/search?q=lock+held+when+returning+to+user+space

will find you people who tripped it ;-) There's a few filesystems that
did various vile things on freeze or so.
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