linux-kernel - Re: kobj refcounting weirdness

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Message-ID: <19f34abd0903091121g73d6cdeeqfa8353b55a3e9607@mail.gmail.com>
Date:	Mon, 9 Mar 2009 19:21:00 +0100
From:	Vegard Nossum <vegard.nossum@...il.com>
To:	Alex Chiang <achiang@...com>, 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

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.

Hi,

Sorry for butting in, just wondering if I could have the patch to fix
the double free? :-)


Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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