----- On Mar 16, 2018, at 5:37 PM, Shehab Elsayed <shehaby...@gmail.com> wrote:
> Hello All, > I am trying to instrument a pthread application using the provided pthread > wrapper, but I sometimes run into a "Double free or corruption error ( fasttop > )" error. Please provide more information about the version of lttng-ust you are using, and how you setup your tracing session. Thanks, Mathieu > Here is a description of what I have tried and noticed: > 1- The problem isn't consistent. It sometimes happen and sometimes works as > expected. > 2- From my experiments, the problem happens (more frequently at least) when > adding performance counter contexts (I tried cycles, cpu _cycles and > instructions). > 3- I am testing using lu _ ncb from splash3 benchmark suite after setting LD _ > PRELOAD to use the pthread wrapper as described in the LTTng documents. > 4- Here is the backtrace printed after exiting: > ======= Backtrace : ========= > /lib64/ libc .so.6([Thread 0x7ffff5611700 ( LWP 97229) exited] > / usr /local/lib/ liblttng - ust .so.0( lttng > _destroy_context+0x35)[0x7ffff7471575] > / usr /local/lib/ liblttng - ust .so.0( lttng > _session_destroy+0x21c)[0x7ffff747363c] > / usr /local/lib/ liblttng - ust .so.0(+0x1e906)[0x7ffff746d906] > / usr /local/lib/ liblttng - ust .so.0( lttng _ ust _ objd _ unref > +0x9f)[0x7ffff746dccf] > / usr /local/lib/ liblttng - ust .so.0( lttng _ ust _ objd _ unref > +0x9f)[0x7ffff746dccf] > / usr /local/lib/ liblttng - ust .so.0( lttng _ ust _ objd _ unref > +0x9f)[0x7ffff746dccf] > / usr /local/lib/ liblttng - ust .so.0( lttng _ ust _ abi > _exit+0x68)[0x7ffff746ead8] > / usr /local/lib/ liblttng - ust .so.0(+0x191d3)[0x7ffff74681d3] > / usr /local/lib/ liblttng - ust .so.0( lttng _ ust > _exit+0x67)[0x7ffff745ed57] > /lib64/ ld - linux -x86-64.so.2(+0xf85a)[0x7ffff7dec85a] > /lib64/ libc .so.6(+0x38a49)[0x7ffff6ca6a49] > /lib64/ libc .so.6(+0x38a95)[0x7ffff6ca6a95] > / aenao -99/elsayed9/ LTTng /data/scripts/ tmp / lu _ ncb [0x401b51] > /lib64/ libc .so.6(__ libc _start_main+0xf5)[0x7ffff6c8fb35] > / aenao -99/elsayed9/ LTTng /data/scripts/ tmp / lu _ ncb [0x401c44] > 5- Also, this is a backtrace I obtained from gdb : > #0 0x00007ffff6eac1d7 in raise () from /lib64/ libc .so.6 > #1 0x00007ffff6ead8c8 in abort () from /lib64/ libc .so.6 > #2 0x00007ffff6eebf07 in __ libc _message () from /lib64/ libc .so.6 > #3 0x00007ffff6ef3503 in _int_free () from /lib64/ libc .so.6 > #4 0x00007ffff768ad25 in lttng _destroy_ perf _counter_field ( > field=<optimized out>) at lttng -context- perf -counters.c:418 > #5 0x00007ffff767a575 in lttng _destroy_context ( > ctx =0x7ffff0011090) at lttng -context.c:278 > #6 0x00007ffff767c63c in _ lttng _channel_ unmap ( > lttng _ chan =0x7ffff0010f40) at lttng -events.c:172 > #7 lttng _session_destroy (session=0x7ffff0000900) > at lttng -events.c:247 > #8 0x00007ffff7676906 in lttng _release_session ( > objd =<optimized out>) at lttng - ust - abi .c:601 > #9 0x00007ffff7676ccf in lttng _ ust _ objd _ unref (id=1, > is_owner=<optimized out>) at lttng - ust - abi .c:216 > #10 0x00007ffff7676ccf in lttng _ ust _ objd _ unref (id=2, > is_owner=<optimized out>) at lttng - ust - abi .c:216 > #11 0x00007ffff7676ccf in lttng _ ust _ objd _ unref (id=id@entry=18, > is_owner=is_owner@entry=1) at lttng - ust - abi .c:216 > #12 0x00007ffff7677ad8 in objd _table_destroy () > at lttng - ust - abi .c:235 > #13 lttng _ ust _ abi _exit () at lttng - ust - abi .c:1002 > #14 0x00007ffff76711d3 in lttng _ ust _cleanup (exiting=1) > at lttng - ust -comm.c:1807 > #15 0x00007ffff7667d57 in lttng _ ust _exit () > at lttng - ust -comm.c:1874 > #16 0x00007ffff7dec85a in _ dl _ fini () > from /lib64/ ld - linux -x86-64.so.2 > #17 0x00007ffff6eafa49 in __run_exit_handlers () > from /lib64/ libc .so.6 > #18 0x00007ffff6eafa95 in exit () from /lib64/ libc .so.6 > #19 0x0000000000401b51 in main ( argc =<optimized out>, > argv =<optimized out>) at lu .c:368 > Any ideas, why this happens and how to fix it? > Thanks, > Shehab > _______________________________________________ > lttng-dev mailing list > lttng-dev@lists.lttng.org > https://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev -- Mathieu Desnoyers EfficiOS Inc. http://www.efficios.com
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