Messages in this thread | | | Date | Fri, 8 Aug 2008 20:46:21 +0200 | From | "Vegard Nossum" <> | Subject | Re: recent -git: BUG in free_thread_xstate |
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On Fri, Aug 1, 2008 at 11:10 PM, Paul E. McKenney <paulmck@linux.vnet.ibm.com> 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.
Hi,
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: http://userweb.kernel.org/~vegard/bugs/20080724-fork/config
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.
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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