atomic_cas_ulong_ni segmentation fault

[raymond.meyer%rambler.ru@localhost]

I'm running 32-bit sparc port of NetBSD 4.99.55 with netbsd_sun4u kernel on 
Ultra 10. The userland and kernel were compiled 
with '-Os -mcpu=ultrasparc -mvis'

#include <stdio.h>
int main(void)
{
        printf("hey\n");
        return 0;
}

If I compile the above program with 'gcc test.c -lpthread' and then run the 
executable, it dies with SEGV.

Running gdb on the core file outputs the following:

Program terminated with signal 11, Segmentation fault
#0 0x40117324 in atomic_cas_ulong_ni () from /usr/lib/libc.so.12
...

Anyones knows what's going on?