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[Bug kprobes/9740] syscall.* probe causes kernel panic(double fault) on rawhide kernel/i686
- From: "mhiramat at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sources dot redhat dot com
- Date: 13 Jan 2009 22:30:28 -0000
- Subject: [Bug kprobes/9740] syscall.* probe causes kernel panic(double fault) on rawhide kernel/i686
- References: <20090113213728.9740.mhiramat@redhat.com>
- Reply-to: sourceware-bugzilla at sourceware dot org
------- 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().
--
http://sourceware.org/bugzilla/show_bug.cgi?id=9740
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