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[Qemu-devel] [Bug 1357206] Re: QEMU user mode still crashes in multi-thr


From: Peter Maydell
Subject: [Qemu-devel] [Bug 1357206] Re: QEMU user mode still crashes in multi-thread code.
Date: Fri, 17 Jun 2016 16:47:03 -0000

This test case now works for me, so I think we have resolved the bug
that was showing up here.


** Changed in: qemu
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/1357206

Title:
  QEMU user mode still crashes in multi-thread code.

Status in QEMU:
  Fix Committed

Bug description:
  I compiled the qemu 2.0 release source and find out qemu crashing when
  emulating multi-thread code in user mode.

  I did a little search and found LP:668799 but it is far from now and
  it is probably not the problem here.

  I used program below as the test program:

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

  void *print_message_function( void *ptr );

  main()
  {
       pthread_t thread1, thread2;
       const char *message1 = "Thread 1";
       const char *message2 = "Thread 2";
       int  iret1, iret2;

      /* Create independent threads each of which will execute function
  */

       iret1 = pthread_create( &thread1, NULL, print_message_function, (void*) 
message1);
       if(iret1)
       {
           fprintf(stderr,"Error - pthread_create() return code: %d\n",iret1);
           exit(EXIT_FAILURE);
       }

       iret2 = pthread_create( &thread2, NULL, print_message_function, (void*) 
message2);
       if(iret2)
       {
           fprintf(stderr,"Error - pthread_create() return code: %d\n",iret2);
           exit(EXIT_FAILURE);
       }

       printf("pthread_create() for thread 1 returns: %d\n",iret1);
       printf("pthread_create() for thread 2 returns: %d\n",iret2);

       /* Wait till threads are complete before main continues. Unless we  */
       /* wait we run the risk of executing an exit which will terminate   */
       /* the process and all threads before the threads have completed.   */

       pthread_join( thread1, NULL);
       pthread_join( thread2, NULL); 

       exit(EXIT_SUCCESS);
  }

  void *print_message_function( void *ptr )
  {
       char *message;
       message = (char *) ptr;
       printf("%s \n", message);
  }

  Compiled to i386 and aarch64 object, 
  and both qemu-i386 and qemu-aarch64 had segmentation faults.

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