From: Charlie Brej <brejc8@vu.a.la>
To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Reproducable user mode system hang
Date: Thu, 12 Aug 2004 20:21:29 +0100 [thread overview]
Message-ID: <411BC339.30504@vu.a.la> (raw)
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
next reply other threads:[~2004-08-12 19:21 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-12 19:21 Charlie Brej [this message]
2004-08-12 19:04 ` Reproducable user mode system hang Marcelo Tosatti
2004-08-12 21:21 ` Charlie Brej
2004-08-12 22:17 ` Marcelo Tosatti
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