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SubjectRe: recent -git: BUG in free_thread_xstate
On Fri, Aug 1, 2008 at 11:10 PM, Paul E. McKenney
<> wrote:
> On Wed, Jul 23, 2008 at 01:31:09PM -0700, Suresh Siddha 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.
>> >
>> > BUG: unable to handle kernel paging request at 00664381
>> > IP: [<c010b274>] free_thread_xstate+0x4/0x30
>> ...
>> > 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?
> I would also like to see the config file.


I'm sorry for the late reply.

I copied you because I saw some RCU entry in the stack trace, but it
is almost definitely not a problem with (core or "leaf") RCU code.
Sometimes it also happens that people will say "oh, I recognize this
problem, the patch has been posted here and here", etc.

It seems to be a problem with either netpoll, netconsole, or the
8139too driver. I find a UDP packet in the task_struct slab, and the
stacktrace with RCU entries come from unrelated, unfortunate callbacks
that stumbled upon the corruption.

My config, if you are still interested, can be found here:

I don't know if the problem persists with the latest -git, it is now a
while since I last tested, but I've checked kernels back to 2.6.20, so
the problem has existed for a long time.


"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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