linux-kernel - Re: kobj refcounting weirdness

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Message-ID: <20090309184131.GI32589@ldl.fc.hp.com>
Date:	Mon, 9 Mar 2009 12:41:31 -0600
From:	Alex Chiang <achiang@...com>
To:	Vegard Nossum <vegard.nossum@...il.com>
Cc:	Matthew Wilcox <matthew@....cx>, Greg KH <greg@...ah.com>,
	kay.sievers@...y.org, rjw@...k.pl, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org
Subject: Re: kobj refcounting weirdness

* Vegard Nossum <vegard.nossum@...il.com>:
> 2009/3/9 Alex Chiang <achiang@...com>:
> > * Matthew Wilcox <matthew@....cx>:
> >> On Mon, Mar 09, 2009 at 10:50:10AM -0600, Alex Chiang wrote:
> >> > I thought about the allocators returning a pointer to the same
> >> > location that maybe has some valid looking data hanging around,
> >> > but it's not wise for someone like me to go pointing fingers at
> >> > the allocator before I've proven the bug isn't in my code. ;)
> >>
> >> Slab poisoning would be the logical next thing to try to decide whether
> >> the allocator is wrong or you're using it wrong ;-)
> >
> > We had a double free in the PCIe port driver. Removing the double
> > free seems to fix my issue.
> >
> > The double free is only in Jesse's linux-next branch, so no need
> > to worry about it in mainline/stable.
> 
> Sorry for butting in, just wondering if I could have the patch to fix
> the double free? :-)

http://thread.gmane.org/gmane.linux.kernel.pci/3524

Remember, it only applies to Jesse's linux-next, since it has
Rafael's latest port driver cleanups.

If you apply it to mainline, you will leak memory.

Thanks.

/ac

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