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SubjectRe: Reproducable user mode system hang
On Thu, Aug 12, 2004 at 08:21:29PM +0100, Charlie Brej wrote:
> I have seem to have found a method to hang the kernel from user mode. The
> system hangs and does not print an Oops. It still responds to network pings
> but nothing else.
>
> I have successfully crashed the 2.6 kernels on three different machines
> (all athlon 2.6 kernels):
> Linux rain.cs.man.ac.uk 2.6.5-1.358 #1 Sat May 8 09:04:50 EDT 2004 i686
> athlon i386 GNU/Linux
> Linux solem.cs.man.ac.uk 2.6.6-1.374 #1 Wed May 19 12:44:14 EDT 2004 i686
> athlon i386 GNU/Linux
> Linux hogshead 2.4.20-8 #1 Thu Mar 13 17:18:24 EST 2003 i686 athlon i386
> GNU/Linux
>
> This problem does not occur on any 2.4 kernel machines I have tried.
>
> Reproducing the problem:
>
> Unfortunately the problem occurs in the middle of a program execution and I
> have been unable to track it down.
>
> Download kmd 0.9.19pre1 from (If anyone wants I could distribute my
> binarys):
> http://www.cs.man.ac.uk/~brejc8/kmd/dist/KMD-0.9.19.pre1.tar.gz
> In user mode configure, compile and execute from the source directory:
> "./kmd -e ./jimulator"
> In the memory windows in the address box type in "E1000000" and press
> return.
> This should now crash the system.
>
> Kmd sporns an emulator (jimulator) with which it communicates using
> stdin/out pipes. I suspect it is a problem in the pipe communication. It
> occurs even when run under valgrind. I don't know of many methods of
> narrowing down the search.

Can you get any kind of trace (ctrl+sysrq+p or NMI oopser) ?

And also make sure to rerun the tests with newer v2.6's.
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