Re: [Valgrind-users] DRD: pt_threadid != INVALID_POSIX_THREADID assertion

[Jonathan R. J. <Jon...@ef...>]

Hi All,

I was able to make a simple program to reproduce it.

See [1] for more details.

TL;DR: dlopen, call function with pthread_create, drd fails on assert.

[1] https://bugs.kde.org/show_bug.cgi?id=356374

Cheers!

On 2015-12-07 09:44 AM, Jonathan Rajotte Julien wrote:
> Hi,
>
> I was trying to use the DRD tool on one of our instrumented application
> (tracing via lttng) and I get an assertion [4] similar to the one from
> this post [1].
> Just like Joe VanAdel I'm wondering whether the problem is on our side
> (lttng) or DRD.
>
> The lttng-ust lib essentially get preloaded and create a thread during
> it's initialization.
> You can find the relevant code for lttng-ust here [3].
>
> A way to reproduce this is to install lttng-ust [3] and use drd on
> the example under lttng-ust/doc/examples/easy-ust/
>
> Let me know if you need any additional information.
>
> Thanks
>
> [1] http://thread.gmane.org/gmane.comp.debugging.valgrind/13995/focus=13996
>
> [2] https://github.com/lttng/lttng-ust
>
> It require liburcu: https://github.com/urcu/userspace-rcu
>
> [3]
> The init function :
> https://github.com/lttng/lttng-ust/blob/master/liblttng-ust/lttng-ust-comm.c#L1483
>
> The actual call to pthread_create:
> https://github.com/lttng/lttng-ust/blob/master/liblttng-ust/lttng-ust-comm.c#L1560
>
> [4]
>
> ==16669== drd, a thread error detector
> ==16669== Copyright (C) 2006-2015, and GNU GPL'd, by Bart Van Assche.
> ==16669== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info
> ==16669== Command: ./sample
> ==16669==
> --16669-- WARNING: unhandled amd64-linux syscall: 324
> --16669-- You may be able to write your own handler.
> --16669-- Read the file README_MISSING_SYSCALL_OR_IOCTL.
> --16669-- Nevertheless we consider this a bug.  Please report
> --16669-- it at http://valgrind.org/support/bug_reports.html.
>
> drd: drd_thread.c:657 (vgDrd_thread_entering_pthread_create): Assertion
> 'DRD_(g_threadinfo)[tid].pt_threadid != INVALID_POSIX_THREADID' failed.
>
> host stacktrace:
> ==16669==    at 0x380256C8: show_sched_status_wrk (m_libcassert.c:343)
> ==16669==    by 0x380257D4: report_and_quit (m_libcassert.c:415)
> ==16669==    by 0x38025961: vgPlain_assert_fail (m_libcassert.c:481)
> ==16669==    by 0x38014E36: vgDrd_thread_entering_pthread_create
> (drd_thread.c:657)
> ==16669==    by 0x3800944B: handle_client_request (drd_clientreq.c:296)
> ==16669==    by 0x3803D040: wrap_tool_handle_client_request
> (m_tooliface.c:280)
> ==16669==    by 0x3807526F: do_client_request (scheduler.c:2101)
> ==16669==    by 0x3807526F: vgPlain_scheduler (scheduler.c:1425)
> ==16669==    by 0x380839EA: thread_wrapper (syswrap-linux.c:102)
> ==16669==    by 0x380839EA: run_a_thread_NORETURN (syswrap-linux.c:155)
>
> sched status:
>     running_tid=1
>
> Thread 1: status = VgTs_Runnable (lwpid 16669)
> ==16669==    at 0x4C3167B: vgDrd_entering_pthread_create
> (drd_pthread_intercepts.c:441)
> ==16669==    by 0x4C3167B: pthread_create_intercept
> (drd_pthread_intercepts.c:594)
> ==16669==    by 0x4C3167B: pthread_create@* (drd_pthread_intercepts.c:611)
> ==16669==    by 0x50696BD: lttng_ust_init (lttng-ust-comm.c:1560)
> ==16669==    by 0x4010139: call_init.part.0 (dl-init.c:78)
> ==16669==    by 0x4010222: call_init (dl-init.c:36)
> ==16669==    by 0x4010222: _dl_init (dl-init.c:126)
> ==16669==    by 0x4001309: ??? (in /lib/x86_64-linux-gnu/ld-2.19.so)
>
>
>
>

-- 
Jonathan R. Julien
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