[lkml]   [2002]   [Aug]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [RFC] Race condition?
Oliver Neukum wrote:
> Am Freitag, 2. August 2002 15:46 schrieb Kasper Dupont:
>>Is there a race condition in this piece of code from do_fork in
> It would seem so. Perhaps the BKL was taken previously.

Even if it was, I doubt the code ever knowingly relied upon it. If I
know that I'm protected under a lock, I rarely go to the trouble of
atomic operations.

The root of the problem is that the reference count is being relied on
for the wrong thing. There is a race on p->user between the
dup_task_struct() and whenever the atomic_inc(&p->user->__count)
occcurs. The user reference count needs to be incremented in
dup_task_struct(), before the copy occurs.
Dave Hansen

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:22    [W:0.094 / U:2.056 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site