linux-kernel - Re: 3.5-rc6 dentry related GPF

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Message-ID: <20120716215318.GA14629@redhat.com>
Date:	Mon, 16 Jul 2012 17:53:18 -0400
From:	Dave Jones <davej@...hat.com>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: 3.5-rc6 dentry related GPF

On Mon, Jul 16, 2012 at 10:32:18PM +0100, Al Viro wrote:
 > On Wed, Jul 11, 2012 at 12:10:12PM -0700, Linus Torvalds wrote:
 > >   rdi = 54415541e5894855
 > > 
 > > which looks like some odd corrupted ASCII to me ("UH\211\345AUAT") but
 > > that makes no sense either.
 > 
 > 	It makes a lot of sense as amd64 code, though:
 > 
 >    55                      push   %rbp
 >    48 89 e5                mov    %rsp,%rbp
 >    41 55                   push   %r13
 >    41 54                   push   %r12
 > 
 > IOW, it's the first 8 bytes from a fairly sane beginning of some function.
 > So &(inode->i_fop->owner) (and thus inode->i_fop - owner is the first field)
 > is some spot in .text.  Would be interesting to find out what function
 > was that from (i.e. what's the value of inode->i_fop); with any luck it
 > might've still been in some register.  Could you post objdump of
 > do_dentry_open() from your kernel?

I've done a few rebuilds since posting that, but hopefully things haven't
moved around too much in that area recently..

http://fpaste.org/Pw5d/ is the whole open.o disassembly.

	Dave

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