On Wed, 16 May 2007 21:00:41 +0300
Zilvinas Valinskas <[email protected]> wrote:
>
> In short, on shutdown my laptop is always freezing now. I was able to
> capture the 'sysrq-P' (hit that several times), sysrq-T outputs. Please
> see .config and log messages at http://barclay.balt.net/~zilvinas/oops/
>
> Kernel version I had built according git is :
>
> zilvinas@zv:/projects/linux-amd64.git$ git describe HEAD
> v2.6.22-rc1-29-gfaa8b6c
>
> On top of that I have CFS v12 applied (no other changes otherwise).
> Please note that there is ''fglrx.ko'' loaded and kernel is tainted
> because of that (feel free to ignore the report ...).
>
> Anyway, 'sysrq-P' always show that PC is stuck at (NFS lockd?) and it is
> always the same backtrace is shown. 'sysrq-t' output is in
> 'kernel-nfs-freeze.log' file (did not want to post it here).
>
> Pid: 3652, comm: lockd Tainted: P 2.6.22-rc1-cfs-v12 #1
>
> [<ffffffff8024a5a0>] wq_barrier_func+0x0/0x10
> [<ffffffff8024a7e5>] destroy_workqueue+0x75/0xa0
> [<ffffffff8833cd34>] :sunrpc:rpciod_down+0xf4/0x170
> [<ffffffff8836dd74>] :lockd:lockd+0x244/0x300
> [<ffffffff80233e1f>] schedule_tail+0x3f/0xb0
> [<ffffffff8020b0f8>] child_rip+0xa/0x12
> [<ffffffff8836db30>] :lockd:lockd+0x0/0x300
> [<ffffffff8836db30>] :lockd:lockd+0x0/0x300
> [<ffffffff8020b0ee>] child_rip+0x0/0x12
>
> Hope this helps. Thanks in advance for any advice how to solve problem !
> For now I am back to '2.6.21.1-cfs-v10'.
>
Nice, thanks.
Zilvinas, could you try the patch below?
It is a shot in the dark. I hope I'll suggest somethimg better tomorrow.
Oleg.
--- OLD/kernel/workqueue.c~ 2007-05-17 00:15:37.000000000 +0400
+++ OLD/kernel/workqueue.c 2007-05-17 02:51:15.000000000 +0400
@@ -752,16 +752,25 @@ static void cleanup_workqueue_thread(str
spin_unlock_irq(&cwq->lock);
if (alive) {
+ int n;
+
wait_for_completion(&barr.done);
- while (unlikely(cwq->thread != NULL))
- cpu_relax();
- /*
- * Wait until cwq->thread unlocks cwq->lock,
- * it won't touch *cwq after that.
- */
- smp_rmb();
- spin_unlock_wait(&cwq->lock);
+ for (n = 0;; ++n) {
+ spin_lock_irq(&cwq->lock);
+ alive = (cwq->thread != NULL);
+ spin_unlock_irq(&cwq->lock);
+
+ if (!alive)
+ break;
+
+ if (n > 1000) {
+ printk(KERN_CRIT "ERR!! wq: %s\n", cwq->wq->name);
+ break;
+ }
+
+ yield();
+ }
}
}
-
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