Commit 316d9679 authored Aug 29, 2008 by Andi Kleen Committed by Linus Torvalds Aug 29, 2008

Don't trigger softlockup detector on network fs blocked tasks



Pulling the ethernet cable on a 2.6.27-rc system with NFS mounts
currently leads to an ongoing flood of soft lockup detector backtraces
for all tasks blocked on the NFS mounts when the hickup takes
longer than 120s.

I don't think NFS problems should be all that noisy.

Luckily there's a reasonably easy way to distingush this case.

Don't report task softlockup warnings for tasks in TASK_KILLABLE
state, which is used by the network file systems.

I believe this patch is a 2.6.27 candidate.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent b4609472

kernel/softlockup.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -180,6 +180,10 @@ static void check_hung_task(struct task_struct *t, unsigned long now)
		if (t->flags & PF_FROZEN)
		return;

		/* Don't check for tasks waiting on network file systems like NFS */
		if (t->state & TASK_KILLABLE)
		return;

		if (switch_count != t->last_switch_count \|\| !t->last_switch_timestamp) {
		t->last_switch_count = switch_count;
		t->last_switch_timestamp = now;

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