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

[Mathieu Desnoyers]

* 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#installlttng
> 
> 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
> 
> 
> 
> 
> 
> 
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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 $*
> demo at lttngdemo:~/pgm/traceout/tpoc$ 
> 

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