Re: lttv SEGV when ltt-probe-arm loaded

* Kevin Hilman ([email protected]) wrote:
> Mathieu Desnoyers wrote:
> > * Kevin Hilman ([email protected]) wrote:
> >> I noticed that when I loaded all the ltt-probe* modules and tried to
> >> view the resulting trace, the viewer crashed.
> >>
> >> I tracked it down to the combination of ltt-probe-arm and
> >> ltt-probe-kernel.   If either are loaded alone, I can view the trace
> >> fine.  If they are both loaded, lttv-gui segfaults.
> >>
> >> Here's the console output, and a tarball of the trace dir is attached.
> >>
> >> khilman@paris:~$ lttv-gui -t ~/tmp/trace
> >> ** Message: event viewer : background computation data ready.
> >> ** Message: control flow viewer : background computation data ready.
> >> /usr/local/bin/lttv-gui: line 10: 10944 Segmentation fault
> >> $LTTV_CMD.real -m guievents -m guifilter -m guicontrolflow -m
> >> guistatistics -m guitracecontrol $*
> >>
> >>
> >> Kevin
> > 
> > Hi,
> > 
> > Can you give the versions you use ?
> 
> ltt 0.6.26
> LinuxTraceToolkitViewer-0.8.69-27102006
> 
> > On what architecture are you running lttv ?
> 
> x86, distro: Ubuntu Edgy.
> 
> Target arch: IXP4xx, big-endian XScale
> 

A quick debugging shows me that the problem is a segmentation fault in the
guistatistics module, due to a system call with ID 983045 (quite high!).
Starting lttv without guistatistics will show the trace, but I will investigate
further : there seems to be a problem in the system call instrumentation.

Mathieu


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