Re: Kernel oops while duming user core.

On Thu, Jan 31, 2008 at 10:15:27AM -0600, Nathan Lynch wrote:

Rune Torgersen wrote:

quoted

Hi

I get the following kernel core while a user program I have is dumping
core.
Any DIeas at what to look for? (this is runnign 2.6.24, arch/powerpc on
a 8280)
When runnign the program on 2.6.18 arch/ppc, the program gets a sig 11
and dumps core.
On 2.6.24, I ghet the kernel oops, and then the program hangs sround
forever and is unkillable.

Hmm, this is the second report of 2.6.24 crashing in
__flush_dcache_icache during a core dump; see:
http://ozlabs.org/pipermail/linuxppc-dev/2007-December/048662.html

Is this easily recreatable?

Yes, this program does it reliably:

#include <pthread.h>
#include <stdio.h>
#include <unistd.h>
#include <signal.h>

void *threadfn(void *arg)
{
	fprintf(stderr, "threadfn\n");
	fflush(stderr);
	sleep(1);
	*(char *)0=0;
	return NULL;
}

int main(void)
{
	pthread_t thread[4];
	int i;

	for (i = 0; i < 4; i++)
		pthread_create(&thread[0], NULL, threadfn, NULL);

	for (;;);
}