linux-ext4 - Re: fuzz testing an ext4fs file system under a 32 bit Linux user mode linux guest let task jbd2/ubda hang

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Date:	Sat, 9 Aug 2014 16:00:18 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Toralf Förster <toralf.foerster@....de>
Cc:	linux-ext4@...r.kernel.org,
	UML devel <user-mode-linux-devel@...ts.sourceforge.net>
Subject: Re: fuzz testing an ext4fs file system under a 32 bit Linux user
 mode linux guest let task jbd2/ubda hang

On Sat, Aug 09, 2014 at 08:45:43PM +0200, Toralf Förster wrote:
> 
> BTW may I just ask, if the following (same 32 bit system, host and
> UML guest are both at v3.16, 4 trinity childs hammering victims
> files in a ramdisk within the uML guest) matches the above too ? Or
> does the BUG output here more helpful data ? :

Unfortunately, there's nothing useful here.  There is more than one
BUG_ON() in this mpage_release_unused_pages function, and what's more,
we have no idea which syscall or combination of syscalls might have
left a page in a particular state.

					- Ted
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