[ltt-dev] [UST issue]: Waiting for ustd to shutdown...Segmentation fault
srikanth krishnakar
skrishnakar at gmail.com
Fri Jul 30 15:06:13 EDT 2010
Hi,
Thank you very much Alexis..
I should have looked into lttv version as you said. Currently I am using :
*LTTV version lttv 0.12.24*
I will upgrade the LTTV package and re-test the functionality. The current
version might be un-supported.
Thank you very much.
Thanks,
Srikanth
------------
On Sat, Jul 31, 2010 at 12:01 AM, Alexis Hallé <alexis.halle at polymtl.ca>wrote:
> 2010/7/30 srikanth krishnakar <skrishnakar at gmail.com>:
> > Hello Alexis,
> >
> > Thanks for your Quick Response !!!
> >
> > There is no trace data collected as per the size of the metadata_* files
> &
> > ust_*
>
> See below.
>
> >
> > I am getting the following error while running the lttv as shown below:
> >
> > -----------------------------
> > root at x86-generic:~# lttv -m textDump -t
> >
> /home/root/.usttraces/x86-generic-20100730150429647915588/2886_5499715367809623712/
> >
> > ** (process:2907): WARNING **: Unsupported trace version : 2.6
> >
> > ** (process:2907): WARNING **: parse_trace_header error
> >
>
> What version of lttv are you using? This "Unsupported trace version"
> sounds to me like you are using an older version. If I am not
> mistaken, you need at least 0.12.30 to be able to load v2.6 traces.
>
> > ** (process:2907): WARNING **: Unsupported trace version : 2.6
> >
> > ** (process:2907): WARNING **: parse_trace_header error
> >
> > ** (process:2907): WARNING **: Unsupported trace version : 2.6
> >
> > ** (process:2907): WARNING **: parse_trace_header error
> >
> > ** (process:2907): WARNING **: Unsupported trace version : 2.6
> >
> > ** (process:2907): WARNING **: parse_trace_header error
> >
> > ** (process:2907): WARNING **: Trace
> >
> /home/root/.usttraces/x86-generic-20100730150429647915588/2886_5499715367809623712
> > has no metadata tracefile
> >
> > ** (process:2907): CRITICAL **: cannot open trace
> >
> /home/root/.usttraces/x86-generic-20100730150429647915588/2886_5499715367809623712/
> > Segmentation fault
> > root at x86-generic:~#
> > -----------------------------
> >
> > When looking into the size of trace files:
> >
> > root at x86-generic:~# du -sh
> >
> /home/root/.usttraces/x86-generic-20100730150429647915588/2886_5499715367809623712/*
> > 4.0K
> >
> /home/root/.usttraces/x86-generic-20100730150429647915588/2886_5499715367809623712/metadata_0
> > 4.0K
> >
> /home/root/.usttraces/x86-generic-20100730150429647915588/2886_5499715367809623712/metadata_1
> > 4.0K
> >
> /home/root/.usttraces/x86-generic-20100730150429647915588/2886_5499715367809623712/ust_0
> > 4.0K
> >
> /home/root/.usttraces/x86-generic-20100730150429647915588/2886_5499715367809623712/ust_1
> > root at x86-generic:~#
> >
> > They all seem to be empty.
>
> The sizes are not unusual if you are tracing a simple test application
> with one or two markers. What exactly is in usttest.c? Did you copy
> the sample code from section 4.1 of the manual? I am tracing this code
> just fine with UST 0.5 and liburcu 0.46, as you mentioned you are
> using. I am getting 4.0K files that load fine in lttv 0.12.33.
>
> >
> > For reference I have attached the strace log for usttrace.
> >
> > Thanks,
> > Srikanth
> > ---------
> > On Fri, Jul 30, 2010 at 9:12 PM, Alexis Hallé <alexis.halle at polymtl.ca>
> > wrote:
> >>
> >> Hi Srikanth,
> >>
> >> 2010/7/30 srikanth krishnakar <skrishnakar at gmail.com>:
> >> > Hello Pierre/Mathieu,
> >> >
> >> > I have followed the instructions for UST(user space tracing) from
> >> > http://lttng.org/files/ust/manual/ust.html
> >> >
> >> > 1. Installed liburcu & ust
> >> >
> >> > liburcu-0.46
> >> > ust-0.5
> >> >
> >> > 2. Compiled the usttest.c
> >> >
> >> > root at x86:~/ust-test# gcc -o usttest -lust usttest.c
> >> >
> >> > root at x86-generic:~/ust-test# ldd ./usttest
> >> > linux-gate.so.1 => (0xb789f000)
> >> > libust.so.0 => /usr/lib/libust.so.0 (0xb787a000)
> >> > libc.so.6 => /lib/libc.so.6 (0xb772d000)
> >> > /lib/ld-linux.so.2 (0xb78a0000)
> >> > liburcu-bp.so.0 => /usr/lib/liburcu-bp.so.0 (0xb772a000)
> >> > librt.so.1 => /lib/librt.so.1 (0xb7715000)
> >> > libpthread.so.0 => /lib/libpthread.so.0 (0xb76fb000)
> >> > root at x86-generic:~/ust-test#
> >> >
> >> > Package Versions:
> >> >
> >> > ###################
> >> > GLIBC: 2.11.1
> >> > GCC: 4.4
> >> > libglib-2.0-0
> >> > ###################
> >> >
> >> > 3. Now start tracing :
> >> >
> >> > root at x86-generic:~/ust-test# usttrace ./usttest
> >> > Waiting for ustd to shutdown...
> >>
> >> The usttrace script starts a daemon on-the-fly for this tracing
> >> session. When it is done tracing it sends this daemon a SIGTERM signal
> >> and waits for it to shutdown. This message is perfectly normal.
> >>
> >> > Trace was output in:
> >> > /home/root/.usttraces/x86-generic-20100730144935535976601
> >> > root at x86-generic:~/ust-test#
> >> >
> >> > Seems some issue in executing of ustctl..
> >> >
> >> > Now checking the presence of trace file:
> >> >
> >> > root at x86-generic:~/.usttraces/x86-generic-20100730144935535976601# du
> >> > -sh *
> >> > 20K 2851_5499711528108666788
> >> > 0 app.log
> >> > 0 ustd.log
> >> > root at x86-generic:~/.usttraces/x86-generic-20100730144935535976601#
> >> >
> >> > 4. Dumping the result on console :
> >> >
> >> >
> >> > root at x86-generic:~# lttv -m textDump -t
> >> > /home/root/.usttraces/x86-generic-20100730144935535976601
> >> >
> >> > ** (process:2862): WARNING **: Unsupported trace version : 2.6
> >> >
> >> > ** (process:2862): WARNING **: parse_trace_header error
> >> >
> >> > ** (process:2862): WARNING **: Unsupported trace version : 2.6
> >> >
> >> > ** (process:2862): WARNING **: parse_trace_header error
> >> >
> >> > ** (process:2862): WARNING **: Unsupported trace version : 2.6
> >> >
> >> > ** (process:2862): WARNING **: parse_trace_header error
> >> >
> >> > ** (process:2862): WARNING **: Unsupported trace version : 2.6
> >> >
> >> > ** (process:2862): WARNING **: parse_trace_header error
> >> >
> >> > ** (process:2862): WARNING **: Trace
> >> > /home/root/.usttraces/x86-20100730144935535976601 has no metadata
> >> > tracefile
> >> >
> >> > ** (process:2862): CRITICAL **: cannot open trace
> >> > /home/root/.usttraces/x86-20100730144935535976601
> >> > Segmentation fault
> >> > root at x86-generic:~#
> >> >
> >> > DMESG OUTPUT:
> >> >
> >> > root at x86-generic:~# dmesg | grep -ir ltt
> >> > [ 5108.713591] lttv.real[2862]: segfault at 40 ip b7732222 sp bfd88e90
> >> > error
> >> > 4 in libglib-2.0.so.0.2200.1[b7714000+b6000]
> >> > root at x86-generic:~#
> >> >
> >> > What is mismatching section/package that is causing this segfault ?
> >> >
> >> > Your inputs are appreciated !! Thanks !!
> >>
> >> When you look inside
> >> /home/root/.usttraces/x86-generic-20100730144935535976601, you can see
> >> a directory named 2851_5499711528108666788. This is the directory
> >> containing the actual trace files, and it is this path that you must
> >> pass to lttv with the -t switch.
> >>
> >> >
> >> >
> >> > Regards,
> >> > Srikanth Krishnakar
> >> > **********************
> >> >
> >> > _______________________________________________
> >> > ltt-dev mailing list
> >> > ltt-dev at lists.casi.polymtl.ca
> >> > http://lists.casi.polymtl.ca/cgi-bin/mailman/listinfo/ltt-dev
> >> >
> >> >
> >>
> >> Regards,
> >>
> >> --
> >> Alexis Hallé
> >> Software Engineering student
> >> Intern, Tracing & Monitoring Project
> >> École Polytechnique de Montréal
> >
> >
> >
> > --
> > "The Good You Do, The Best You GET"
> >
> > Regards
> > Srikanth Krishnakar
> > **********************
> >
>
>
>
> --
> Alexis Hallé
> Software Engineering student
> Intern, Tracing & Monitoring Project
> École Polytechnique de Montréal
>
--
"The Good You Do, The Best You GET"
Regards
Srikanth Krishnakar
**********************
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