Messages in this thread | | | Date | Wed, 4 May 2005 11:43:18 -0700 | From | Chris Wedgwood <> | Subject | Re: A patch for the file kernel/fork.c |
| |
On Wed, May 04, 2005 at 03:26:44PM -0300, Andr? Pereira de Almeida wrote:
> >>- if (tsk->clear_child_tid && atomic_read(&mm->mm_users) > 1) { > >>+ if (mm && tsk->clear_child_tid && atomic_read(&mm->mm_users) > 1)
> In a preemptible kernel with the serport module and a serial port try to > run the following program: > > int main(int argc, char **argv) > { > int ldisc,fd; > > fd = open("/dev/ttyS0", O_RDWR | O_NOCTTY | O_NONBLOCK); > ldisc = N_MOUSE; > ioctl(fd, TIOCSETD, &ldisc); > read(fd, NULL, 0); > return 0; > } > > and kill it. In my case it will hang the computer. I think this is > a problem with the serport module. With this patch, the serial mouse > stop working, but the computer don't hang.
then above something like:
BUG_ON(!mm);
or something might be better and eyeball the stack trace.
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |