[Bug libmudflap/28578] New: A most simple multithreaded program (practically any multithreaded one) causes mudflap violation

[vesselinpeev at hotmail dot com]

Here are the exact steps carried out, resulting in the violation "mudflap
violation 1 (unregister)", despite this program being absolutely correct. Note
also that I have confirmed the identical problem with the gcc trunk -- version
4.2.0 (20060729) as well:

$ cat test.c
#include <stdio.h>
#include <pthread.h>

void* test_thread(void* arg)
{
        printf("\nHello from thread!");
        pthread_exit(NULL);
}

int main()
{
#ifdef _REENTRANT
        printf("\nYes, _REENTRANT is defined");
#endif
        pthread_t thread;
        int arg = 0;
        pthread_create(&thread, NULL, test_thread, (void*)arg);
        pthread_exit(NULL);
        return 0;
}

$ gcc -g -fmudflapth -pthread test.c -lmudflapth

$ ./a.out

*******
mudflap violation 1 (unregister): time=1154562440.431557 ptr=0x67d4e0 size=0
pc=0x6273e9
      /usr/lib/libmudflapth.so.0(__mf_unregister+0x49) [0x6273e9]
      /usr/lib/libmudflapth.so.0(__real_free+0xae) [0x62833e]
      /lib/libdl.so.2 [0xa7051a]
number of nearby objects: 0
Yes, _REENTRANT is defined
Hello from thread!


-- 
           Summary: A most simple multithreaded program (practically any
                    multithreaded one) causes mudflap violation
           Product: gcc
           Version: 4.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libmudflap
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: vesselinpeev at hotmail dot com
  GCC host triplet: 386


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28578