[ltt-dev] [LTTV] segmentation fault while reading traces

[Mathieu Desnoyers]

* Birken, Klaus (klaus.birken at harman.com) wrote:
> Hi Mathieu,
> 
> yes, we did:
> 
> ltt-armall
> lttctl -C -w /tmp/trace1 trace1
> ...
> Lttctl -D trace1
> 
> ----------------------------------------
> 
> Two more details that might be related to the problem:
> - while loading the kernel modules, the modules jbd2-trace and
> ext4-trace could not be found. 

That is not related.

> - when I start lttv-gui with --debug, the warnings are still issued,
> but sometimes the application doesn't crash (but is _very_ slow).
> Seems to be a race condition, though.

Hrm, you might want to try with newer lttv versions, just in case we
fixed this.

Thanks,

Mathieu

> 
> Regards,
> Klaus
> 
> 
> 
> >-----Ursprüngliche Nachricht-----
> >Von: pdumas9 at sympatico.ca [mailto:pdumas9 at sympatico.ca] Im Auftrag von
> >Mathieu Desnoyers
> >Gesendet: Dienstag, 24. Mai 2011 15:48
> >An: Birken, Klaus
> >Cc: ltt-dev at lists.casi.polymtl.ca
> >Betreff: Re: [ltt-dev] [LTTV] segmentation fault while reading traces
> >
> >* Birken, Klaus (klaus.birken at harman.com) wrote:
> >> Hi all,
> >>
> >> when opening a LTT kernel trace, lttv-gui reports some "Cannot find
> >> pin_in in schedchange" messages and segv's soon afterwards.
> >>
> >> My configuration on target: x86, multicore (via hyperthreading),
> >> kernel 2.6.36, patched with LTTng 0.245, modules 0.19.6, LTT control
> >> 0.89.
> >>
> >> I am using the VMware image of the LTTng demo machine (latest
> >> downloaded), this is 0.12.37. Attached is the shell output.
> >>
> >> BTW: While configuring the patched kernel, we couldn't find the Kernel
> >> Option "Immediate value optimization" in menuconfig. However, this has
> >> been mentioned in the manual:
> >>
> >http://git.lttng.org/?p=lttv.git;a=blob_plain;f=LTTngManual.html#install
> >lttng
> >>
> >> Might this be a serious problem leading to crashing lttv-gui?
> >
> >No. Immediate value config is deprecated/removed from the tree anyway.
> >
> >Did you run ltt-armall before tracing ?
> >
> >Mathieu
> >
> >>
> >> Thanks in advance, regards,
> >> Klaus Birken
> >>
> >>
> >>
> >>
> >>
> >>
> >> [cid:image001.png at 01CC1A1A.A7EA8C20]
> >>
> >>
> >>
> >>
> >>
> >> Raiffeisenstr. 34
> >> 70794 Filderstadt
> >> Phone: +49 711 90770 540
> >> Fax: +49 711 90770 300
> >> Mobile: +49 160 96969364
> >> Email: klaus.birken at harman.com<mailto:klaus.birken at harman.com>
> >> Web: www.harman.com
> >>
> >> DR. KLAUS BIRKEN
> >> Senior Software Architect
> >> Harman/Becker Automotive Systems
> >>
> >>
> >>
> >>
> >>
> >>
> >> Confidentiality Notice: This e-mail message, including any
> >attachments, is for the sole use of the intended recipient(s) and may
> >contain confidential and privileged information. Any unauthorized
> >review, use, disclosure or distribution is prohibited. If you are not
> >the intended recipient, please contact the sender by return e-mail and
> >destroy all copies of the original message.
> >>
> >>
> >>
> >
> >
> >
> >Content-Description: lttv_crash.txt
> >> demo at lttngdemo:~/pgm/traceout/tpoc$ lttv-gui --sync
> >> ** Message: statistics viewer : background computation data ready.
> >> ** Message: statistics viewer : background computation data ready.
> >>
> >> ** (lttv.real:2066): WARNING **: Trace 0 contains no
> >net.dev_xmit_extended marker
> >>
> >>
> >> ** (lttv.real:2066): WARNING **: Trace 0 contains no
> >net.tcpv4_rcv_extended marker
> >>
> >>
> >> ** (lttv.real:2066): WARNING **: Cannot find pin_in in schedchange 696
> >>
> >> ** (lttv.real:2066): WARNING **: Cannot find pin_in in schedchange 697
> >>
> >> ** (lttv.real:2066): WARNING **: Cannot find pin_in in schedchange 698
> >>
> >> ** (lttv.real:2066): WARNING **: Cannot find pin_in in schedchange 696
> >>
> >> ** (lttv.real:2066): WARNING **: Cannot find pin_in in schedchange 697
> >>
> >> ** (lttv.real:2066): WARNING **: Cannot find pin_in in schedchange 698
> >> /usr/bin/lttv-gui: line 10:  2066 Segmentation fault
> >$LTTV_CMD.real -m lttvwindow -m guievents -m guifilter -m guicontrolflow
> >-m resourceview -m guistatistics -m guitracecontrol $*
> >> demo at lttngdemo:~/pgm/traceout/tpoc$
> >>
> >
> >> _______________________________________________
> >> ltt-dev mailing list
> >> ltt-dev at lists.casi.polymtl.ca
> >> http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev
> >
> >
> >--
> >Mathieu Desnoyers
> >Operating System Efficiency R&D Consultant
> >EfficiOS Inc.
> >http://www.efficios.com
> 

-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com