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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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