[Bug 571577] Re: Valgrind's thread checker not working correctly

[Alessandro Ghedini]

> I also tried with the SVN version (11112) and it works correctly.
Please update the Ubuntu package...

Closing, since the package has been updated.

** Changed in: valgrind (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/571577

Title:
  Valgrind's thread checker not working correctly

Status in “valgrind” package in Ubuntu:
  Fix Released

Bug description:
  Binary package hint: valgrind

  I have Ubuntu 10.04 with Valgrind 3.6.0~svn20100212-0ubuntu5. I
  created a simple test program like this

  
  #include <pthread.h>
  #include <unistd.h>
  #include <stdio.h>
  #include <stdlib.h>

  static void *func(void *a)
  {
      a = NULL;
          while (1) {
                      sleep(1);
                          }
              return NULL;
  }

  int main()
  {
      pthread_t trd;

          if (pthread_create(&trd, NULL, func, NULL)) {
                      exit(1);
                          }
              pthread_detach(trd);
                  sleep(60);
                      return 0;
  }

  
  but I get an error when running the helgrind

  
  # gcc -Wall vgtest.c -lpthread
  # valgrind --trace-children=yes --verbose --tool=helgrind ./a.out
  ...
  ==13694== Thread #2 was created
  ==13694==    at 0x513365E: clone (clone.S:77)
  ==13694==    by 0x4E37172: pthread_create@@GLIBC_2.2.5 (createthread.c:75)
  ==13694==    by 0x4C2C42C: pthread_create_WRK (hg_intercepts.c:230)
  ==13694==    by 0x4C2C4CF: pthread_create@* (hg_intercepts.c:257)
  ==13694==    by 0x4006B6: main (in /var/tmp/a.out)
  ==13694==
  ==13694== Thread #1 is the program's root thread
  ==13694==
  ==13694== Possible data race during write of size 8 at 0x7ff0009e0 by thread #2
  ==13694==    at 0x4C2C54C: mythread_wrapper (hg_intercepts.c:200)
  ==13694==  This conflicts with a previous read of size 8 by thread #1
  ==13694==    at 0x4C2C440: pthread_create_WRK (hg_intercepts.c:235)
  ==13694==    by 0x4C2C4CF: pthread_create@* (hg_intercepts.c:257)
  ==13694==    by 0x4006B6: main (in /var/tmp/a.out)
  ==13694==

  
  I also tried with the SVN version (11112) and it works correctly. Please update the Ubuntu package...

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