Messages in this thread | | | Date | Thu, 12 Aug 2004 20:21:29 +0100 | From | Charlie Brej <> | Subject | Reproducable user mode system hang |
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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.
-- Charlie Brej APT Group, Dept. Computer Science, University of Manchester Web: http://www.cs.man.ac.uk/~brejc8/ Tel: +44 161 275 6844 Mail: IT302, Manchester University, Manchester, M13 9PL, UK - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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