Messages in this thread | | | Date | Tue, 26 Nov 2013 16:26:54 +0900 | From | Masami Hiramatsu <> | Subject | Re: (ltc-kernel 7837) Re: [BUG] 3.13-rc1 kernel crash when enable all tracepoints |
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(2013/11/26 15:33), Masami Hiramatsu 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.
Oops, No, forget it. When I added a printk in ftrace_set_clr_event_nolock(), it didn't happen and ftrace/function is not enabled.
I'm trying to reproduce it on the latest tip kernel again on KVM, but not yet reproduced.
Thank you,
-- Masami HIRAMATSU IT Management Research Dept. Linux Technology Center Hitachi, Ltd., Yokohama Research Laboratory E-mail: masami.hiramatsu.pt@hitachi.com
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