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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: 27 Dec 2005 03:41:21 -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 2005-12-27 03:41 -------
In linux 2.6.15-RC5-mm3, it does not crash in IA32, when running in EM64T, I
find that when there is int3 instruction in the first int3 hanlder function,
the first int 3 handler function can continue to execute, but when this
funciton return, system will crash.
For example, when kp_pre() in mon_sched.c calls
my_test_reentrant_export_function function which has been probed,
my_test_reentrant_export_function can continue to execute,but when it returned
system crashed.
And I think maybe it is the problem of trap stack in EM64T, I do not know how
trap stack is established when trap happens in use/kenrel mode or trap
executing mode.
--
http://sourceware.org/bugzilla/show_bug.cgi?id=2071
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