linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Ingo Molnar <mingo@elte.hu>
To: Parag Warudkar <parag.warudkar@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>,
	LKML <linux-kernel@vger.kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: soft lockup - CPU#1 stuck for 15s! [swapper:0]
Date: Sat, 8 Dec 2007 16:47:55 +0100	[thread overview]
Message-ID: <20071208154755.GA5255@elte.hu> (raw)
In-Reply-To: <82e4877d0712080736v12c1e31at9149655ae000fe50@mail.gmail.com>


* Parag Warudkar <parag.warudkar@gmail.com> wrote:

>  [<c0438293>] tick_broadcast_oneshot_control+0x10/0xda
>  [<c0437ce2>] tick_notify+0x1d4/0x2eb
>  [<c04281bc>] get_next_timer_interrupt+0x143/0x1b4
>  [<c06058a1>] notifier_call_chain+0x2a/0x47
>  [<c04345c0>] raw_notifier_call_chain+0x17/0x1a
>  [<c043781e>] clockevents_notify+0x19/0x4f
>  [<c0533d23>] acpi_idle_enter_simple+0x183/0x1d0
>  [<c058cf03>] cpuidle_idle_call+0x53/0x78
>  [<c058ceb0>] cpuidle_idle_call+0x0/0x78
>  [<c0402575>] cpu_idle+0x97/0xb8
>  =======================
> BUG: soft lockup - CPU#1 stuck for 11s! [vim:3736]

does the patch below help? But the root cause is likely some timer 
problems - do you get consistent results from:

   while :; do time usleep 1111111; done

or do these sleeps fluctuate?

	Ingo

Index: linux/kernel/sched.c
===================================================================
--- linux.orig/kernel/sched.c
+++ linux/kernel/sched.c
@@ -774,6 +774,7 @@ void sched_clock_idle_wakeup_event(u64 d
 	struct rq *rq = cpu_rq(smp_processor_id());
 	u64 now = sched_clock();
 
+	touch_softlockup_watchdog();
 	rq->idle_clock += delta_ns;
 	/*
 	 * Override the previous timestamp and ignore all

  reply	other threads:[~2007-12-08 15:48 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-12-07 22:53 BUG: soft lockup - CPU#1 stuck for 15s! [swapper:0] Parag Warudkar
2007-12-07 23:12 ` Pallipadi, Venkatesh
2007-12-07 23:31   ` Parag Warudkar
2007-12-08  2:56   ` Thomas Gleixner
2007-12-08 15:10     ` Parag Warudkar
2007-12-08 15:36       ` Parag Warudkar
2007-12-08 15:47         ` Ingo Molnar [this message]
2007-12-08 16:00           ` Parag Warudkar
2007-12-08 19:13             ` Ingo Molnar
2007-12-08 19:33               ` Parag Warudkar
2007-12-08 19:42                 ` Ingo Molnar
2007-12-08 20:08                   ` Parag Warudkar
2007-12-08 20:11                     ` Ingo Molnar
2007-12-08 20:46                       ` Parag Warudkar
2007-12-08 20:51                         ` Arjan van de Ven
2007-12-08 21:04                           ` Parag Warudkar
2007-12-08 23:12                             ` Parag Warudkar
2007-12-09 21:57                               ` Parag Warudkar
2007-12-09 22:30                                 ` Arjan van de Ven
2007-12-10  5:49                                 ` Thomas Gleixner
2007-12-11  4:49                                   ` Parag Warudkar
2007-12-14 23:17                                     ` Len Brown
2007-12-15  0:51                                       ` Parag Warudkar
2007-12-15  8:10                                         ` Thomas Gleixner
2007-12-15 18:48                                           ` Parag Warudkar
2007-12-16  5:15                                             ` Parag Warudkar
2007-12-16 13:43                                               ` Parag Warudkar
2007-12-17  8:05                                                 ` Thomas Gleixner
2007-12-17 13:08                                                   ` Parag Warudkar
2007-12-17 22:05                                                     ` Thomas Gleixner
2008-01-09 11:56                                                       ` Thomas Gleixner
2008-01-11  0:31                                                         ` Parag Warudkar
2008-01-11  9:50                                                           ` Thomas Gleixner
2007-12-07 23:17 ` BUG: " Andrew Morton
2007-12-08  2:35   ` Rafael J. Wysocki
2007-12-09 22:42 parag.warudkar

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20071208154755.GA5255@elte.hu \
    --to=mingo@elte.hu \
    --cc=akpm@linux-foundation.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=parag.warudkar@gmail.com \
    --cc=tglx@linutronix.de \
    --cc=torvalds@linux-foundation.org \
    --cc=venkatesh.pallipadi@intel.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).