linux-kernel - Re: [2.6.27-rc5] inotify_read's ev_mutex vs do_page_fault's mmap

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Message-Id: <200809110612.51736.nickpiggin@yahoo.com.au>
Date:	Thu, 11 Sep 2008 06:12:51 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	"Daniel J Blueman" <daniel.blueman@...il.com>
Cc:	torvalds@...ux-foundation.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Linux Kernel" <linux-kernel@...r.kernel.org>
Subject: Re: [2.6.27-rc5] inotify_read's ev_mutex vs do_page_fault's mmap_sem...

On Wednesday 10 September 2008 14:07, Nick Piggin wrote:
> On Wednesday 10 September 2008 07:03, Daniel J Blueman wrote:
> > I observed this locking violation [1] while gnome-panel was loading;
> > this was previously reported at
> > http://uwsg.iu.edu/hypermail/linux/kernel/0806.3/2881.html .
> >
> > Let me know for more information/config/testing. Thanks!
>
> Thanks for the report. I've attached a patch you could test. It compiles
> (and boots a UML here) but I don't think I've actually tested the inotify
> path at all, so it may explode on you.

Indeed it was wrong, I messed up the waitqueue handling. This one
survives longer for me...

View attachment "inotify-lor-fix.patch" of type "text/x-diff" (2630 bytes)