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

[Birken, Klaus]

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. 
- 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.

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]
>>
>>
>>
>>
>>
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>> 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