linux-kernel - Re: recent -git: BUG in free_thread

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Message-ID: <19f34abd0807231505w1a25c2bak329a622f3a287e97@mail.gmail.com>
Date:	Thu, 24 Jul 2008 00:05:45 +0200
From:	"Vegard Nossum" <vegard.nossum@...il.com>
To:	"Dmitry Adamushko" <dmitry.adamushko@...il.com>
Cc:	"Suresh Siddha" <suresh.b.siddha@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>
Subject: Re: recent -git: BUG in free_thread_xstate

On Thu, Jul 24, 2008 at 12:01 AM, Dmitry Adamushko
<dmitry.adamushko@...il.com> wrote:
>> BUG: unable to handle kernel paging request at c0804358
>> IP: [<c057e38d>] schedule+0x1ed/0x850

[...]

> So I guess, 'cpu' value is slightly, well, out of reality. Check the
> address of "runqueues" in your kernel image...
> I guess, it should be quite close to the "fault" address... then we
> can even calculate 'cpu' :-)

Yup, that's right.

$ nm vmlinux | grep runqueues
c0803f00 d per_cpu__runqueues


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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