linux-kernel - Re: [PATCH] CRED: Fix regression in cap_capable() as shown up by sys

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Message-ID: <20090103184921.GB20166@fieldses.org>
Date:	Sat, 3 Jan 2009 13:49:21 -0500
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	David Howells <dhowells@...hat.com>
Cc:	Christoph Hellwig <hch@....de>, jmorris@...ei.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] CRED: Fix regression in cap_capable() as shown up by
	sys_faccessat() [ver #2]

On Fri, Jan 02, 2009 at 11:45:05AM -0500, bfields wrote:
> On Fri, Jan 02, 2009 at 11:59:38AM +0000, David Howells wrote:
> > J. Bruce Fields <bfields@...ldses.org> wrote:
> > 
> > > No.  I started bisecting, and it does appear to be a regression from the
> > > cred patches, but at some point in the middle there it hangs on boot (a
> > > softlockup report blames a spinlock in set_groups).
> > 
> > Do you remember which patch you were at?

More precisely:
	- The last working commit is b6dff3ec... "CRED: Separate task
	  security context from task_struct".
	- The first commit exhibiting the permissions problem is
	  a6f76f2... "CRED: Make execve() take advantage of
	  copy-on-write credentials".
	- The 9 commits in between (from f1752eec to d84f4f9) result in
	  a soft lookup on boot.

--b.
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