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Date: Fri, 29 Aug 2008 20:06:23 +0200 From: Andi Kleen <andi@...stfloor.org> To: torvalds@...l.org, mingo@...e.hu, linux-kernel@...r.kernel.org Cc: Trond.Myklebust@...app.com Subject: [PATCH] Don't trigger softlockup detector on network fs blocked tasks 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@...ux.intel.com> Index: linux-2.6.27-rc4-misc/kernel/softlockup.c =================================================================== --- linux-2.6.27-rc4-misc.orig/kernel/softlockup.c +++ linux-2.6.27-rc4-misc/kernel/softlockup.c @@ -180,6 +180,10 @@ static void check_hung_task(struct task_ 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; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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