[Bug kprobes/2071] Probes on ISR with probes on task thread's prehandler crash the system

[bibo dot mao at intel dot com]

------- Additional Comments From bibo dot mao at intel dot com  2005-12-29 08:53 -------
I think this problem only happens in 2.6.15-rc5-mm3, there is one patch 
http://www.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.15-
rc5/2.6.15-rc5-mm3/broken-out/x86_64-debug-stack.patch, this patch changed int3 
handler stack, debug and int3 share the same stack(DEBUG_STACK), this stack is 
saved in TSS structure, (64-Bit Extension Technology Software Developer's Guide 
Volume 1 of 2, section 1.6.10.5).
With this patch, every time debug/int3 exception happens, it will changed to 
DEBUG_STACK, so when reentrancy int3 happens, the later int3 handler will 
overwrite pervious DEBUG_STACK. So system crashed.

-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=2071

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