Messages in this thread | | | Date | Tue, 26 Nov 2013 15:20:29 +0800 | Subject | Re: [BUG] 3.13-rc1 kernel crash when enable all tracepoints | From | Jovi Zhangwei <> |
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On Tue, Nov 26, 2013 at 2:33 PM, Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> wrote: > (2013/11/26 13:38), Jovi Zhangwei wrote: >> Hi, >> >> I'm not sure this issue already be fixed or not, it can be reproduced >> permanently. >> >> (I didn't use git-bisect yet, you guys might can understand it quickly) >> >> #echo 1 > /sys/kernel/debug/tracing/events/enable > > Thanks for reporting. I could reproduce it. > > To narrow this down, I tried to run the below command > > [tracing]# for i in events/*/*/enable ; do echo $i; echo 1 > $i; done > > And it ran through the end without any problem. > Hm, next I checked the difference of available_events and set_event. > > [tracing]# diff available_events set_event > 283d282 > < ftrace:function > > So, I guess it was caused by enabling ftrace:function, and > it is unable to do that via set_event, nor events/ftrace/enable > I'm not sure how, but it seems that ftrace:function can be > enabled by the events/enable. > I'm not sure this relate with ftrace:function event, from the crash log, it seems more like caused by lock events.
Now I only enable lock events (lockdep compiled in my box), below two commands both can crash system.
#echo 1 > /sys/kernel/debug/tracing/events/lock/lock_acquire/enable or. #echo 1 > /sys/kernel/debug/tracing/events/lock/lock_release/enable
According to the log, it seems like a recursion tracing bug.
register lock event -> jump_label_update -> text_poke_bp -> on_each_cpu -> local_apic_timer_interrupt -> ktime_get_update_offsets -> lock_release
(Perhaps the crash you reproduced is another crash? similar crash log?)
Jovi
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