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[Bug kprobes/2071] Probes on ISR with probes on task thread's prehandler crash the system
- From: "bibo dot mao at intel dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sources dot redhat dot com
- Date: 29 Dec 2005 08:53:39 -0000
- Subject: [Bug kprobes/2071] Probes on ISR with probes on task thread's prehandler crash the system
- References: <20051220073112.2071.anil.s.keshavamurthy@intel.com>
- Reply-to: sourceware-bugzilla at sourceware dot org
------- 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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