From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Sasha Levin <sasha.levin@oracle.com>
Cc: Josh Triplett <josh@joshtriplett.org>,
Steven Rostedt <rostedt@goodmis.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Lai Jiangshan <laijs@cn.fujitsu.com>,
LKML <linux-kernel@vger.kernel.org>,
Dave Jones <davej@redhat.com>
Subject: Re: rcu: frequent rcu lockups
Date: Wed, 11 Mar 2015 16:16:13 -0700 [thread overview]
Message-ID: <20150311231613.GO5412@linux.vnet.ibm.com> (raw)
In-Reply-To: <5500CA80.9010007@oracle.com>
On Wed, Mar 11, 2015 at 07:06:40PM -0400, Sasha Levin wrote:
> On 03/11/2015 07:01 PM, Paul E. McKenney wrote:
> >> With the commit I didn't hit it yet, but I do see 4 different WARNings:
> > I wish that I could say that I am surprised, but the sad fact is that
> > I am still shaking the bugs out.
>
> I have one more to add:
>
> [ 93.330539] WARNING: CPU: 1 PID: 8 at kernel/rcu/tree_plugin.h:476 rcu_gp_kthread+0x1eaa/0x4dd0()
A bit different, but still in the class of a combining-tree bitmask
handling bug.
Thanx, Paul
> [ 93.333515] Modules linked in:
> [ 93.334678] CPU: 1 PID: 8 Comm: rcu_preempt Tainted: G W 4.0.0-rc3-next-20150311-sasha-00035-g0a45b48-dirty #2052
> [ 93.338402] ffff8800496f8000 00000000f3e72ee7 ffff880049ac7b28 ffffffff9ea97e89
> [ 93.339495] 0000000000000000 0000000000000000 ffff880049ac7b78 ffffffff941e242a
> [ 93.339495] ffffffffa1721038 ffffffff9433bf2a ffffffffa1721040 ffff8800a2822000
> [ 93.339495] Call Trace:
> [ 93.339495] [<ffffffff9ea97e89>] dump_stack+0x4f/0x7b
> [ 93.339495] [<ffffffff941e242a>] warn_slowpath_common+0xca/0x130
> [ 93.339495] [<ffffffff9433bf2a>] ? rcu_gp_kthread+0x1eaa/0x4dd0
> [ 93.339495] [<ffffffff941e266a>] warn_slowpath_null+0x1a/0x20
> [ 93.339495] [<ffffffff9433bf2a>] rcu_gp_kthread+0x1eaa/0x4dd0
> [ 93.339495] [<ffffffff95f2346c>] ? plist_check_head+0x3c/0x50
> [ 93.339495] [<ffffffff9433a080>] ? cond_synchronize_rcu+0x20/0x20
> [ 93.339495] [<ffffffff942dffb5>] ? trace_hardirqs_on_caller+0x475/0x610
> [ 93.339495] [<ffffffff9eb0bdf9>] ? _raw_spin_unlock_irq+0x69/0xa0
> [ 93.339495] [<ffffffff9eaf95e3>] ? __schedule+0x993/0x1b90
> [ 93.339495] [<ffffffff95f49e39>] ? ___preempt_schedule+0x12/0x14
> [ 93.339495] [<ffffffff942c4530>] ? abort_exclusive_wait+0x1d0/0x1d0
> [ 93.339495] [<ffffffff9433a080>] ? cond_synchronize_rcu+0x20/0x20
> [ 93.339495] [<ffffffff94248b56>] kthread+0x216/0x2e0
> [ 93.339495] [<ffffffff94248940>] ? flush_kthread_work+0x300/0x300
> [ 93.339495] [<ffffffff9eb0bdc0>] ? _raw_spin_unlock_irq+0x30/0xa0
> [ 93.339495] [<ffffffff94248940>] ? flush_kthread_work+0x300/0x300
> [ 93.339495] [<ffffffff9eb0d293>] ret_from_fork+0x53/0x80
> [ 93.339495] [<ffffffff94248940>] ? flush_kthread_work+0x300/0x300
>
>
> Thanks,
> Sasha
>
next prev parent reply other threads:[~2015-03-11 23:16 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-11 19:57 rcu: frequent rcu lockups Sasha Levin
2015-03-11 20:17 ` Paul E. McKenney
2015-03-11 20:18 ` Sasha Levin
2015-03-11 20:41 ` Paul E. McKenney
2015-03-11 22:18 ` Sasha Levin
2015-03-11 23:01 ` Paul E. McKenney
2015-03-11 23:06 ` Sasha Levin
2015-03-11 23:16 ` Paul E. McKenney [this message]
2015-03-12 12:28 ` Sasha Levin
2015-03-12 12:32 ` Sasha Levin
2015-03-12 14:07 ` Paul E. McKenney
2015-03-13 17:39 ` Paul E. McKenney
2015-03-15 20:43 ` Paul E. McKenney
2015-03-15 23:32 ` Sasha Levin
2015-03-16 0:02 ` Paul E. McKenney
2015-03-20 14:15 ` Sasha Levin
2015-03-20 14:29 ` Paul E. McKenney
2015-03-20 14:46 ` Sasha Levin
2015-03-20 15:35 ` Paul E. McKenney
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