buggy debugging of multithreaded programs on PowerPC

[Steven G. Johnson]

I am using gdb 4.18 under Debian GNU/linux 2.2 (glibc 2.1.3) on a PowerPC
('99 Macintosh Powerbook G3, 400MHz PowerPC 750, 192MB RAM), with gcc
2.95.2, and I encountered an apparent bug when debugging multithreaded
programs.

Basically, when I try to debug the program below, or any program that
calls pthread_create, I get an error like:

Program received signal ?, Unknown signal.
0xfee1244 in sigset () from /lib/libc.so.6
(gdb) where
#0  0xfee1244 in sigset () from /lib/libc.so.6
#1  0xffd4a40 in __pthread_wait_for_restart_signal () from
/lib/libpthread.so.0
#2  0xffd4018 in pthread_create@@GLIBC_2.1 () from /lib/libpthread.so.0
#3  0x100005ac in main (argc=1, argv=0x7ffffa74) at foo.c:17

Let me know if you have any suggestions, or if I can provide more info.

Thanks for your efforts!  gdb is a great piece of Free Software.

Cordially,
Steven G. Johnson

--------------------------- test program -------------------------

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

void *work2(void *foo)
{
     while (1) {
          printf("got %d\n", (int) foo);
          sleep(2);
     }
     return 0;
}

int main(int argc, char **argv)
{
     pthread_t id; 
     pthread_create( &id, NULL, work2, (void*) 0 );
     printf("Created thread.\n"); fflush(stdout);
     while (1) {
          printf("Waiting...\n");
          sleep(5);
     }
     return 0;
}