Re: 242-ac3 loop bug

[Jens Axboe]

On Sat, Feb 24 2001, Mark Swanson wrote:
> First, good job on the loop device. It's rock stable for me - except

thanks, glad to hear it.

> when I try to load the blowfish module which oops the kernel and
> crashes the loop device:-) No problem, I just use another cipher.

cipher bug or? never the less, could you ksymoops that and send
it along?

> The bug I'm reporting is that when a loop device is in use the load of
> the machine stays at 1.00 even though nothing is happening. If I umount
> the loop filesystem the load goes down to 0.00.
> 
> > ps -aux | grep loop
> 1674 tty1     DW<   0:00 [loop0]
> 
> The system is doing nothing to the loop filesystem.
> Strange that the process isn't logging any cpu usage time. It's
> definately responsible for the 1.00 load.

Oops, this slipped by me. Patch should fix it.

-- 
Jens Axboe


--- drivers/block/loop.c~       Sat Feb 24 23:08:38 2001
+++ drivers/block/loop.c        Sat Feb 24 23:11:13 2001
@@ -507,7 +507,7 @@
        sprintf(current->comm, "loop%d", lo->lo_number);
 
        spin_lock_irq(&current->sigmask_lock);
-       siginitsetinv(&current->blocked, sigmask(SIGKILL));
+       sigfillset(&current->blocked);
        flush_signals(current);
        spin_unlock_irq(&current->sigmask_lock);
 
@@ -525,7 +525,7 @@
        up(&lo->lo_sem);
 
        for (;;) {
-               down(&lo->lo_bh_mutex);
+               down_interruptible(&lo->lo_bh_mutex);
                if (!atomic_read(&lo->lo_pending))
                        break;