From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <434D2CCD.4070802@domain.hid>
Date: Wed, 12 Oct 2005 17:33:33 +0200
From: Luotao Fu <devtty0@domain.hid>
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Content-Type: multipart/mixed; boundary="------------090009080603070302070208"
Subject: [Xenomai-help] Kernel oops on posix threads
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Hi folks,

I found out that parallel threads using the Posix skin cause kernel oops
somewhere between the finishing of the threads and the main thread. I
have two threads, say thread A and thread B. Both created as joinable
threads and they have both the same priority 99. The main routine hold a
semaphore semA to synchronize the threads. After the creation thread A
waits on the Semaphore semA, while the thread B runs and releases semA,
so that semA can finish. On exiting the thread B I always get a Kernel
ooops. The kernerl says:

unable to handle kernel paging request at virtual address 6b6b6b77
etc.......

I scratched some simple code which causes this Kernel Ooops. Packed a
tar ball together with the makefile and attached the tar ball it to this
mail so that you might have a look at it yourself.
I'm using
Kernel: Vanilla 2.6.12 patched with adeos-linux-2.6.12-i386-r12.patch
Distr. Debian 3.1
Testhost: vmware 5.0
compiler gcc 3.3.5

I also wrote some code doing the same tasks in RTAI native context and
it ran without problems. Hence I suppose the problem to be in the posix
skin.
Am I making any mistakes in the code or have I evtl. found a bug in the
posix skin?

Cheers
Luotao Fu

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