Hi all,

In the latest gdb AIX users aren't able to debug multi threaded programs.

I have fixed it. Please find attached the patch. [See 0001-Fix-multi-thread-debug-bug-in-AIX.patch].

Also pasting the output of the failure and the output after adding the patch.

Kindly let me know if any change required, if not kindly push this patch so that AIX folks have a happy multi threaded debugging.

Have a nice day ahead.

Thanks and regards,
Aditya.

---------------------------------------------------------

The code:- [Program Credits:- GDB TESTSUITE gdb_threads/continue-pending-status.c ]


#include <unistd.h>

#include <stdlib.h>

#include <pthread.h>

#include <assert.h>


pthread_barrier_t barrier;


#define NUM_THREADS 2


void *

thread_function (void *arg)

{

  pthread_barrier_wait (&barrier);

  while (1);

}


int

main (void)

{

  int i;


  alarm (300);


  pthread_barrier_init (&barrier, NULL, NUM_THREADS);


  for (i = 0; i < NUM_THREADS; i++)

    {

      pthread_t thread;

      int res;


      res = pthread_create (&thread, NULL,

                            thread_function, NULL);

      assert (res == 0);

    }


  while (1)

    sleep (1);


  return 0;

}

OUTPUT BEFORE PATCH:-


(gdb) r

Starting program: /home/gdb_tests/continue-pending-status

[New Thread 1]

./../gdbsupport/gdb-checked-static-cast.h:58: internal-error: checked_static_cast: Assertion `result != nullptr' failed.

A problem internal to GDB has been detected,

further debugging may prove unreliable.

----- Backtrace -----

0x1010fb657 ???

0x1010fb81f ???


OUTPUT AFTER PATCH


(gdb) r

Starting program: /home/gdb_tests/continue-pending-status

[New Thread 1]

^C[New Thread 258]

[New Thread 515]


Thread 1 received signal SIGINT, Interrupt.

0xd0595fb0 in _p_nsleep () from /usr/lib/libpthread.a(shr_xpg5.o)

(gdb) info threads

  Id   Target Id                          Frame

* 1    process 7602548                    0xd0595fb0 in _p_nsleep ()

   from /usr/lib/libpthread.a(shr_xpg5.o)

  2    Thread 1 (tid 27984319, running)   0xd0595fb0 in _p_nsleep ()

   from /usr/lib/libpthread.a(shr_xpg5.o)

  3    Thread 258 (tid 37093859, running) thread_function (arg=0x0)

    at continue-pending-status.c:36

  4    Thread 515 (tid 35062111, running) thread_function (arg=warning: (Internal error: pc 0x0 in read in psymtab, but not in symtab.)


0x0)

    at continue-pending-status.c:36

(gdb) q