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[Bug kprobes/5759] probes in sched.c on preempt kernel cause reboot
- From: "jkenisto at us dot ibm dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sources dot redhat dot com
- Date: 13 Feb 2008 01:09:31 -0000
- Subject: [Bug kprobes/5759] probes in sched.c on preempt kernel cause reboot
- References: <20080212161826.5759.hunt@redhat.com>
- Reply-to: sourceware-bugzilla at sourceware dot org
------- Additional Comments From jkenisto at us dot ibm dot com 2008-02-13 01:09 -------
(In reply to comment #6)
> The translator is supposed to (and on my Fedora rawhide 2.6.24*
> VM running cvs systemtap, does) block probes on __init type functions.
>
> % stap -p2 -vvv -e 'probe kernel.function("....") {}' 2>&1 | grep skipping.init
>
> lists those functions that are excluded from probing due to this issue.
> I wonder why this is not working for your kernel.
Most likely because I didn't pick up the latest stap bits before testing.
Unfortunately, even after I exclude the __init functions from my list, I'm still
seeing some hangs. I believe probing add_preempt_count or preempt_schedule will
cause a hang. Other than those, I think the first 160 functions in the list*
are clean. There's a hang somewhere in 161-170 (show_state_filter -
sys_sched_get_priority_max). *after removing the init functions
--
http://sourceware.org/bugzilla/show_bug.cgi?id=5759
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