[lttng-dev] 32-bit application crash

jamie explorer jamieexplorer at gmail.com
Mon Aug 3 06:49:47 EDT 2015

i am trying to run 32-bit application and see crash at the the line where
"tracepoint" is used.
i am using sample application given in lttng-ust-2.6.0/doc/examples/gen-tp/
Not able to understand why the problem is seen only with 32-bit apps? Can
experts here pls help me fix this.

Have tried using ELF 32-bit app on Intel 80386 and PowerPC and see the
crash. Where as 64-bit applications have no problem.

following is the code where it crashes
        for (i = 0; i < 100000; i++) {
                tracepoint(sample_tracepoint, message,  "Hello World\n");
 <<<< Crash here

GDB output:

#0  0x00000000 in ?? ()
#1  0x10001e54 in __event_probe__sample_tracepoint___message (
    __tp_data=0x10015420, text=0x100034a4 "Hello World\n")
    at /build/home/jam/gentp/sample_tracepoint.h:13
#2  0x10000b9c in __tracepoint_cb_sample_tracepoint___message (
    text=0x100034a4 "Hello World\n")
    at //build/home/jam/gentp/sample_tracepoint.h:13
#3  main (argc=<optimized out>, argv=<optimized out>)
    at /build/home/jam/gentp/sample.c:115

i am running 32-bit version of lttng-sessiond
root at host:~# ps aux | grep lttng
root      4224  0.0  0.0  92212  1648 ?        Ssl  00:42   0:00
/usr/bin/lttng-sessiond --consumerd32-path
/usr/lib/lttng/libexec/lttng-consumerd --consumerd32-libdir /usr/lib/ -b
root      4243  0.0  0.0  64212   956 ?        Sl   00:42   0:00
lttng-consumerd  -u --consumerd-cmd-sock
/var/run/lttng/ustconsumerd32/command --consumerd-err-sock
/var/run/lttng/ustconsumerd32/error --group tracing

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