Re: Fw: [Bugme-new] [Bug 13366] New: About 80% of shutdowns fail (blocking)

[Hugh Dickins <hugh.dickins@tiscali.co.uk>]

A git-bisect would indeed be worthwhile; but looking through the diff
between 2.6.30-rc5 and 2.6.30-rc7 didn't show any likely candidates -
I wonder if this will turn out to be something more elusive.

Is this an Acer Aspire One?  Looks rather like it: I tried building
your kernel (on openSUSE rather than Ubuntu) on mine, and running it:
no luck reproducing your issue here.

I doubt this has got much to do with mlockall() or lru_add_drain_all()
themselves: it looks rather as if an events thread has "gone away".

Would you mind applying the hacky patch below, and posting the
screenshot from shutdown?  I assume from the fact that you posted
a photo, that nothing useful gets out to the logs: so here I'm trying
to leave just the "events/0" and "events/1" stacktraces onscreen.

--- 2.6.30-rc7/kernel/hung_task.c	2009-04-08 14:59:26.000000000 +0100
+++ linux/kernel/hung_task.c	2009-05-25 18:45:11.000000000 +0100
@@ -98,7 +98,7 @@ static void check_hung_task(struct task_
 	printk(KERN_ERR "\"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\""
 			" disables this message.\n");
 	sched_show_task(t);
-	__debug_show_held_locks(t);
+	show_state_filter(512);
 
 	touch_nmi_watchdog();
 
--- 2.6.30-rc7/kernel/sched.c	2009-05-09 09:24:35.000000000 +0100
+++ linux/kernel/sched.c	2009-05-25 19:08:05.000000000 +0100
@@ -6514,13 +6514,14 @@ void show_state_filter(unsigned long sta
 		 * console might take alot of time:
 		 */
 		touch_nmi_watchdog();
-		if (!state_filter || (p->state & state_filter))
+		if ((state_filter == 512 && !strncmp(p->comm, "events/", 7)) ||
+		    !state_filter || (p->state & state_filter))
 			sched_show_task(p);
 	} while_each_thread(g, p);
 
 	touch_all_softlockup_watchdogs();
 
-#ifdef CONFIG_SCHED_DEBUG
+#ifdef CONFIG_SCHED_DEBUG_NOT
 	sysrq_sched_debug_show();
 #endif
 	read_unlock(&tasklist_lock);

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