[Bug lket/4420] systemtap.samples/lket.exp test crashing RHEL4U4 machine

[wcohen at redhat dot com]

------- Additional Comments From wcohen at redhat dot com  2007-05-25 19:43 -------
The kernels have CONFIG_DEBUG_SPINLOCK=y set. This machine is running a UP
kernel. The spinlock code is for the most part is a no-op, but the
CONFIG_DEBUG_SPINLOCK code check to make sure that only one attempt is made by
the processor to get the lock. It appears on the lket.stp that the kprobe code
being executed is causing an exception that attempts to grab the lock again. On
the UP kernel the spinlock code causes a panic as a result for this.

The SMP kernel assumes that more than one attempt can be made for the same
spinlock. When running the  systemtap.samples/lket.stp on the same same version
of the kernel, 2.6.9-55, but SMP version the lket script runs without crashing.

-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=4420

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