From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Nicholas Piggin <npiggin@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>,
Jonathan Cameron <Jonathan.Cameron@huawei.com>,
dzickus@redhat.com, sfr@canb.auug.org.au, linuxarm@huawei.com,
abdhalee@linux.vnet.ibm.com, tglx@linutronix.de,
sparclinux@vger.kernel.org, akpm@linux-foundation.org,
linuxppc-dev@lists.ozlabs.org, David Miller <davem@davemloft.net>,
linux-arm-kernel@lists.infradead.org, john.stultz@linaro.org
Subject: Re: RCU lockup issues when CONFIG_SOFTLOCKUP_DETECTOR=n - any one else seeing this?
Date: Sat, 19 Aug 2017 22:04:52 -0700 [thread overview]
Message-ID: <20170820050452.GI11320@linux.vnet.ibm.com> (raw)
In-Reply-To: <20170820144553.2ab2727b@ppc64le>
On Sun, Aug 20, 2017 at 02:45:53PM +1000, Nicholas Piggin wrote:
> On Wed, 16 Aug 2017 09:27:31 -0700
> "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> wrote:
> > On Wed, Aug 16, 2017 at 05:56:17AM -0700, Paul E. McKenney wrote:
> >
> > Thomas, John, am I misinterpreting the timer trace event messages?
>
> So I did some digging, and what you find is that rcu_sched seems to do a
> simple scheudle_timeout(1) and just goes out to lunch for many seconds.
> The process_timeout timer never fires (when it finally does wake after
> one of these events, it usually removes the timer with del_timer_sync).
>
> So this patch seems to fix it. Testing, comments welcome.
Fired up some tests, which should complete in about 12 hours.
Here is hoping! ;-)
Thanx, Paul
WARNING: multiple messages have this Message-ID (diff)
From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: linux-arm-kernel@lists.infradead.org
Subject: Re: RCU lockup issues when CONFIG_SOFTLOCKUP_DETECTOR=n - any one else seeing this?
Date: Sun, 20 Aug 2017 05:04:52 +0000 [thread overview]
Message-ID: <20170820050452.GI11320@linux.vnet.ibm.com> (raw)
In-Reply-To: <20170820144553.2ab2727b@ppc64le>
On Sun, Aug 20, 2017 at 02:45:53PM +1000, Nicholas Piggin wrote:
> On Wed, 16 Aug 2017 09:27:31 -0700
> "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> wrote:
> > On Wed, Aug 16, 2017 at 05:56:17AM -0700, Paul E. McKenney wrote:
> >
> > Thomas, John, am I misinterpreting the timer trace event messages?
>
> So I did some digging, and what you find is that rcu_sched seems to do a
> simple scheudle_timeout(1) and just goes out to lunch for many seconds.
> The process_timeout timer never fires (when it finally does wake after
> one of these events, it usually removes the timer with del_timer_sync).
>
> So this patch seems to fix it. Testing, comments welcome.
Fired up some tests, which should complete in about 12 hours.
Here is hoping! ;-)
Thanx, Paul
WARNING: multiple messages have this Message-ID (diff)
From: paulmck@linux.vnet.ibm.com (Paul E. McKenney)
To: linux-arm-kernel@lists.infradead.org
Subject: RCU lockup issues when CONFIG_SOFTLOCKUP_DETECTOR=n - any one else seeing this?
Date: Sat, 19 Aug 2017 22:04:52 -0700 [thread overview]
Message-ID: <20170820050452.GI11320@linux.vnet.ibm.com> (raw)
In-Reply-To: <20170820144553.2ab2727b@ppc64le>
On Sun, Aug 20, 2017 at 02:45:53PM +1000, Nicholas Piggin wrote:
> On Wed, 16 Aug 2017 09:27:31 -0700
> "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> wrote:
> > On Wed, Aug 16, 2017 at 05:56:17AM -0700, Paul E. McKenney wrote:
> >
> > Thomas, John, am I misinterpreting the timer trace event messages?
>
> So I did some digging, and what you find is that rcu_sched seems to do a
> simple scheudle_timeout(1) and just goes out to lunch for many seconds.
> The process_timeout timer never fires (when it finally does wake after
> one of these events, it usually removes the timer with del_timer_sync).
>
> So this patch seems to fix it. Testing, comments welcome.
Fired up some tests, which should complete in about 12 hours.
Here is hoping! ;-)
Thanx, Paul
next prev parent reply other threads:[~2017-08-20 5:05 UTC|newest]
Thread overview: 241+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-25 11:32 RCU lockup issues when CONFIG_SOFTLOCKUP_DETECTOR=n - any one else seeing this? Jonathan Cameron
2017-07-25 12:26 ` Nicholas Piggin
2017-07-25 12:26 ` Nicholas Piggin
2017-07-25 13:46 ` Paul E. McKenney
2017-07-25 13:46 ` Paul E. McKenney
2017-07-25 13:46 ` Paul E. McKenney
2017-07-25 14:42 ` Jonathan Cameron
2017-07-25 14:42 ` Jonathan Cameron
2017-07-25 14:42 ` Jonathan Cameron
2017-07-25 15:12 ` Paul E. McKenney
2017-07-25 15:12 ` Paul E. McKenney
2017-07-25 15:12 ` Paul E. McKenney
2017-07-25 16:52 ` Jonathan Cameron
2017-07-25 16:52 ` Jonathan Cameron
2017-07-25 16:52 ` Jonathan Cameron
2017-07-25 21:10 ` David Miller
2017-07-25 21:10 ` David Miller
2017-07-25 21:10 ` David Miller
2017-07-26 3:55 ` Paul E. McKenney
2017-07-26 3:55 ` Paul E. McKenney
2017-07-26 3:55 ` Paul E. McKenney
2017-07-26 4:02 ` David Miller
2017-07-26 4:02 ` David Miller
2017-07-26 4:02 ` David Miller
2017-07-26 4:12 ` Paul E. McKenney
2017-07-26 4:12 ` Paul E. McKenney
2017-07-26 4:12 ` Paul E. McKenney
2017-07-26 8:16 ` Jonathan Cameron
2017-07-26 8:16 ` Jonathan Cameron
2017-07-26 8:16 ` Jonathan Cameron
2017-07-26 9:32 ` Jonathan Cameron
2017-07-26 9:32 ` Jonathan Cameron
2017-07-26 9:32 ` Jonathan Cameron
2017-07-26 12:28 ` Jonathan Cameron
2017-07-26 12:28 ` Jonathan Cameron
2017-07-26 12:28 ` Jonathan Cameron
2017-07-26 12:49 ` Jonathan Cameron
2017-07-26 12:49 ` Jonathan Cameron
2017-07-26 12:49 ` Jonathan Cameron
2017-07-26 14:14 ` Paul E. McKenney
2017-07-26 14:14 ` Paul E. McKenney
2017-07-26 14:14 ` Paul E. McKenney
2017-07-26 14:23 ` Jonathan Cameron
2017-07-26 14:23 ` Jonathan Cameron
2017-07-26 14:23 ` Jonathan Cameron
2017-07-26 15:33 ` Jonathan Cameron
2017-07-26 15:33 ` Jonathan Cameron
2017-07-26 15:33 ` Jonathan Cameron
2017-07-26 15:49 ` Paul E. McKenney
2017-07-26 15:49 ` Paul E. McKenney
2017-07-26 15:49 ` Paul E. McKenney
2017-07-26 16:54 ` David Miller
2017-07-26 16:54 ` David Miller
2017-07-26 16:54 ` David Miller
2017-07-26 17:13 ` Jonathan Cameron
2017-07-26 17:13 ` Jonathan Cameron
2017-07-26 17:13 ` Jonathan Cameron
2017-07-27 7:41 ` Jonathan Cameron
2017-07-27 7:41 ` Jonathan Cameron
2017-07-27 7:41 ` Jonathan Cameron
2017-07-26 17:50 ` Paul E. McKenney
2017-07-26 17:50 ` Paul E. McKenney
2017-07-26 17:50 ` Paul E. McKenney
2017-07-26 22:36 ` Paul E. McKenney
2017-07-26 22:36 ` Paul E. McKenney
2017-07-26 22:36 ` Paul E. McKenney
2017-07-26 22:45 ` David Miller
2017-07-26 22:45 ` David Miller
2017-07-26 22:45 ` David Miller
2017-07-26 23:15 ` Paul E. McKenney
2017-07-26 23:15 ` Paul E. McKenney
2017-07-26 23:15 ` Paul E. McKenney
2017-07-26 23:22 ` David Miller
2017-07-26 23:22 ` David Miller
2017-07-26 23:22 ` David Miller
2017-07-27 1:42 ` Paul E. McKenney
2017-07-27 1:42 ` Paul E. McKenney
2017-07-27 1:42 ` Paul E. McKenney
2017-07-27 4:34 ` Nicholas Piggin
2017-07-27 4:34 ` Nicholas Piggin
2017-07-27 4:34 ` Nicholas Piggin
2017-07-27 12:49 ` Paul E. McKenney
2017-07-27 12:49 ` Paul E. McKenney
2017-07-27 12:49 ` Paul E. McKenney
2017-07-27 13:49 ` Jonathan Cameron
2017-07-27 13:49 ` Jonathan Cameron
2017-07-27 13:49 ` Jonathan Cameron
2017-07-27 16:39 ` Jonathan Cameron
2017-07-27 16:39 ` Jonathan Cameron
2017-07-27 16:39 ` Jonathan Cameron
2017-07-27 16:52 ` Paul E. McKenney
2017-07-27 16:52 ` Paul E. McKenney
2017-07-27 16:52 ` Paul E. McKenney
2017-07-28 7:44 ` Jonathan Cameron
2017-07-28 7:44 ` Jonathan Cameron
2017-07-28 7:44 ` Jonathan Cameron
2017-07-28 12:54 ` Boqun Feng
2017-07-28 12:54 ` Boqun Feng
2017-07-28 12:54 ` Boqun Feng
2017-07-28 13:13 ` Jonathan Cameron
2017-07-28 13:13 ` Jonathan Cameron
2017-07-28 13:13 ` Jonathan Cameron
2017-07-28 14:55 ` Paul E. McKenney
2017-07-28 14:55 ` Paul E. McKenney
2017-07-28 14:55 ` Paul E. McKenney
2017-07-28 18:41 ` Paul E. McKenney
2017-07-28 18:41 ` Paul E. McKenney
2017-07-28 18:41 ` Paul E. McKenney
2017-07-28 19:09 ` Paul E. McKenney
2017-07-28 19:09 ` Paul E. McKenney
2017-07-28 19:09 ` Paul E. McKenney
2017-07-30 13:37 ` Boqun Feng
2017-07-30 13:37 ` Boqun Feng
2017-07-30 13:37 ` Boqun Feng
2017-07-30 16:59 ` Paul E. McKenney
2017-07-30 16:59 ` Paul E. McKenney
2017-07-30 16:59 ` Paul E. McKenney
2017-07-29 1:20 ` Boqun Feng
2017-07-29 1:20 ` Boqun Feng
2017-07-29 1:20 ` Boqun Feng
2017-07-28 18:42 ` David Miller
2017-07-28 18:42 ` David Miller
2017-07-28 18:42 ` David Miller
2017-07-28 13:08 ` Jonathan Cameron
2017-07-28 13:08 ` Jonathan Cameron
2017-07-28 13:24 ` Jonathan Cameron
2017-07-28 13:24 ` Jonathan Cameron
2017-07-28 13:24 ` Jonathan Cameron
2017-07-28 16:55 ` Paul E. McKenney
2017-07-28 16:55 ` Paul E. McKenney
2017-07-28 17:27 ` Jonathan Cameron
2017-07-28 17:27 ` Jonathan Cameron
2017-07-28 17:27 ` Jonathan Cameron
2017-07-28 19:03 ` Paul E. McKenney
2017-07-28 19:03 ` Paul E. McKenney
2017-07-28 19:03 ` Paul E. McKenney
2017-07-31 11:08 ` Jonathan Cameron
2017-07-31 11:08 ` Jonathan Cameron
2017-07-31 11:08 ` Jonathan Cameron
2017-07-31 15:04 ` Paul E. McKenney
2017-07-31 15:04 ` Paul E. McKenney
2017-07-31 15:04 ` Paul E. McKenney
2017-07-31 15:27 ` Jonathan Cameron
2017-07-31 15:27 ` Jonathan Cameron
2017-07-31 15:27 ` Jonathan Cameron
2017-08-01 18:46 ` Paul E. McKenney
2017-08-01 18:46 ` Paul E. McKenney
2017-08-01 18:46 ` Paul E. McKenney
2017-08-02 16:25 ` Jonathan Cameron
2017-08-02 16:25 ` Jonathan Cameron
2017-08-02 16:25 ` Jonathan Cameron
2017-08-15 15:47 ` Paul E. McKenney
2017-08-15 15:47 ` Paul E. McKenney
2017-08-15 15:47 ` Paul E. McKenney
2017-08-16 1:24 ` Jonathan Cameron
2017-08-16 1:24 ` Jonathan Cameron
2017-08-16 1:24 ` Jonathan Cameron
2017-08-16 12:43 ` Michael Ellerman
2017-08-16 12:43 ` Michael Ellerman
2017-08-16 12:43 ` Michael Ellerman
2017-08-16 12:56 ` Paul E. McKenney
2017-08-16 12:56 ` Paul E. McKenney
2017-08-16 12:56 ` Paul E. McKenney
2017-08-16 15:31 ` Nicholas Piggin
2017-08-16 15:31 ` Nicholas Piggin
2017-08-16 15:31 ` Nicholas Piggin
2017-08-16 16:27 ` Paul E. McKenney
2017-08-16 16:27 ` Paul E. McKenney
2017-08-16 16:27 ` Paul E. McKenney
2017-08-17 13:55 ` Michael Ellerman
2017-08-17 13:55 ` Michael Ellerman
2017-08-17 13:55 ` Michael Ellerman
2017-08-20 4:45 ` Nicholas Piggin
2017-08-20 4:45 ` Nicholas Piggin
2017-08-20 4:45 ` Nicholas Piggin
2017-08-20 5:01 ` David Miller
2017-08-20 5:01 ` David Miller
2017-08-20 5:01 ` David Miller
2017-08-20 5:04 ` Paul E. McKenney [this message]
2017-08-20 5:04 ` Paul E. McKenney
2017-08-20 5:04 ` Paul E. McKenney
2017-08-20 13:00 ` Nicholas Piggin
2017-08-20 13:00 ` Nicholas Piggin
2017-08-20 13:00 ` Nicholas Piggin
2017-08-20 18:35 ` Paul E. McKenney
2017-08-20 18:35 ` Paul E. McKenney
2017-08-20 18:35 ` Paul E. McKenney
2017-08-20 21:14 ` Paul E. McKenney
2017-08-20 21:14 ` Paul E. McKenney
2017-08-20 21:14 ` Paul E. McKenney
2017-08-21 0:52 ` Nicholas Piggin
2017-08-21 0:52 ` Nicholas Piggin
2017-08-21 0:52 ` Nicholas Piggin
2017-08-21 6:06 ` Nicholas Piggin
2017-08-21 6:06 ` Nicholas Piggin
2017-08-21 6:06 ` Nicholas Piggin
2017-08-21 10:18 ` Jonathan Cameron
2017-08-21 10:18 ` Jonathan Cameron
2017-08-21 10:18 ` Jonathan Cameron
2017-08-21 14:19 ` Nicholas Piggin
2017-08-21 14:19 ` Nicholas Piggin
2017-08-21 14:19 ` Nicholas Piggin
2017-08-21 15:02 ` Jonathan Cameron
2017-08-21 15:02 ` Jonathan Cameron
2017-08-21 15:02 ` Jonathan Cameron
2017-08-21 20:55 ` David Miller
2017-08-21 20:55 ` David Miller
2017-08-21 20:55 ` David Miller
2017-08-22 7:49 ` Jonathan Cameron
2017-08-22 7:49 ` Jonathan Cameron
2017-08-22 7:49 ` Jonathan Cameron
2017-08-22 8:51 ` Abdul Haleem
2017-08-22 8:51 ` Abdul Haleem
2017-08-22 8:51 ` Abdul Haleem
2017-08-22 15:26 ` Paul E. McKenney
2017-08-22 15:26 ` Paul E. McKenney
2017-08-22 15:26 ` Paul E. McKenney
2017-09-06 12:28 ` Paul E. McKenney
2017-09-06 12:28 ` Paul E. McKenney
2017-09-06 12:28 ` Paul E. McKenney
2017-08-22 0:38 ` Paul E. McKenney
2017-08-22 0:38 ` Paul E. McKenney
2017-08-22 0:38 ` Paul E. McKenney
2017-07-31 11:09 ` Jonathan Cameron
2017-07-31 11:09 ` Jonathan Cameron
2017-07-31 11:09 ` Jonathan Cameron
2017-07-31 11:55 ` Jonathan Cameron
2017-07-31 11:55 ` Jonathan Cameron
2017-07-31 11:55 ` Jonathan Cameron
2017-08-01 10:53 ` Jonathan Cameron
2017-08-01 10:53 ` Jonathan Cameron
2017-08-01 10:53 ` Jonathan Cameron
2017-07-26 16:48 ` David Miller
2017-07-26 16:48 ` David Miller
2017-07-26 16:48 ` David Miller
2017-07-26 3:53 ` Paul E. McKenney
2017-07-26 3:53 ` Paul E. McKenney
2017-07-26 3:53 ` Paul E. McKenney
2017-07-26 7:51 ` Jonathan Cameron
2017-07-26 7:51 ` Jonathan Cameron
2017-07-26 7:51 ` Jonathan Cameron
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