Re: recent -git: BUG in free_thread_xstate

From: Vegard Nossum
Date: Wed Jul 23 2008 - 16:39:34 EST


On Wed, Jul 23, 2008 at 10:31 PM, Suresh Siddha
<suresh.b.siddha@xxxxxxxxx> wrote:
> On Wed, Jul 23, 2008 at 01:07:04PM -0700, Vegard Nossum wrote:
>> Hi,
>> I just got this on c010b2f76c3032e48097a6eef291d8593d5d79a6 (-git from
>> yesterday):
> Do you see this in 2.6.26 aswell? I suspect it is coming from post 2.6.26
> changes.

Just reproduced it on latest linux-2.6.git.

>> BUG: unable to handle kernel paging request at 00664381
>> IP: [<c010b274>] free_thread_xstate+0x4/0x30
> ...

The funny thing is that this number (00664281) is _always_ the same,
even on the newer kernel. What's special about it?

>> EIP is at arch/x86/kernel/process.c:36:
>> if (tsk->thread.xstate) {
> It looks like the kernel stack of that process got corrupted, corrupting the
> task pointer in thread_info. Can you send us your config file?

It has been uploaded here:

Given the reproducible nature of this, I think I'll just go ahead and
start a bisect...

Thanks for looking :-)


"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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