On Mon, Feb 02, 2015 at 03:05:36PM +0100, Oleg Nesterov wrote: > attach_to_pi_owner() checks p->mm to prevent attaching to kthreads and > this looks doubly wrong: > > 1. It should actually check PF_KTHREAD, kthread can do use_mm(). > > 2. If this task is not kthread and it is actually the lock owner we can > wrongly return -EPERM instead of -ESRCH or retry-if-EAGAIN. > > And note that this wrong EPERM is the likely case unless the exiting > task is (auto)reaped quickly, we check ->mm before PF_EXITING. > > Signed-off-by: Oleg Nesterov <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
