[Bug kprobes/9740] syscall.* probe causes kernel panic(double fault) on rawhide kernel/i686

[mhiramat at redhat dot com]

------- Additional Comments From mhiramat at redhat dot com  2009-01-13 22:30 -------
This might be related to synchronize_sched() changes.
Here, the syscall2.ko is the pre-compiled script of 'global pids; probe
syscall.* {pids[pid()]<<<1}' *without* batch unregister.

$ time staprun -d syscall2.ko

real	0m0.005s
user	0m0.000s
sys	0m0.003s

This machine has 4 cpu and syscall2.ko has 318 probes. this means when removing
syscall2.ko, kprobes may call synchronize_sched() 318 times. Usually, it needs
more than 100ms because it doesn't use unregister_kprobes().


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http://sourceware.org/bugzilla/show_bug.cgi?id=9740

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