lkml.org 
[lkml]   [2002]   [Aug]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: lockup on Athlon systems, kernel race condition?
Terence Ripperda wrote:
>
> ...
>
> asmlinkage long sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
> {
> struct file * filp;
> unsigned int flag;
> int on, error = -EBADF;
>
> filp = fget(fd);
> if (!filp)
> goto out;
> error = 0;
> lock_kernel(); <====
> switch (cmd) {

This CPU is spinning, waiting for kernel_flag. It will take the IPI
and the other CPU's smp_call_function() will succeed.

Possibly the IPI has got lost - seems that this is a popular failure mode
for flakey chipsets/motherboards.

Or someone has called sys_ioctl() with interrupts disabled. That's very
doubtful.
-
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/

\
 
 \ /
  Last update: 2005-03-22 13:28    [W:0.060 / U:2.580 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site