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.
-
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