From: Ingo Molnar <mingo@elte.hu>
To: mingo@redhat.com, hpa@zytor.com, paulmck@linux.vnet.ibm.com,
linux-kernel@vger.kernel.org, tglx@linutronix.de,
"Steven Rostedt" <rostedt@goodmis.org>,
=?unknown-8bit?B?RnLDqWTDqXJpYw==?= Weisbecker
<fweisbec@gmail.com>
Cc: linux-tip-commits@vger.kernel.org
Subject: Re: [tip:core/rcu] rcu: Fix holdoff for accelerated GPs for last non-dynticked CPU
Date: Tue, 16 Mar 2010 12:51:23 +0100 [thread overview]
Message-ID: <20100316115123.GA25467@elte.hu> (raw)
In-Reply-To: <20100316110323.GA31038@elte.hu>
on vanilla .34-rc1 i get this crash:
[ 3.375120] initcall init_stack_trace+0x0/0x12 returned 0 after 136718 usecs
[ 3.376739] calling init_function_trace+0x0/0x3e @ 1
[ 3.390046] Testing tracer function:
[ 3.416665] BUG: unable to handle kernel paging request at ffffffffffffffaf
[ 3.416666] IP: [<ffffffff81a5b222>] schedule+0x33b/0x6ed
[ 3.416666] PGD 23b9067 PUD 23ba067 PMD 0
[ 3.416666] Oops: 0002 [#1] PREEMPT SMP
[ 3.416666] last sysfs file:
[ 3.416666] CPU 1
[ 3.416666] Pid: 40, comm: rcu_torture_rea Not tainted 2.6.34-rc1-dirty #112 /
[ 3.416666] RIP: 0010:[<ffffffff81a5b222>] [<ffffffff81a5b222>] schedule+0x33b/0x6ed
[ 3.416666] RSP: 0018:ffff88003c871d30 EFLAGS: 00010082
[ 3.416666] RAX: ffff88003c869640 RBX: ffff8800093d5200 RCX: 0000000001e9ab12
[ 3.416666] RDX: 0000000000334987 RSI: ffff88003c869640 RDI: ffff8800093d5200
[ 3.416666] RBP: ffffffffffffffff R08: ffff88003c869678 R09: 0000000000000001
[ 3.416666] R10: 0000000291cd04d1 R11: ffff8800093d5200 R12: ffff88003c870000
[ 3.416666] R13: ffff88003c869bb8 R14: ffff88003c871df0 R15: 0000000000000001
[ 3.416666] FS: 0000000000000000(0000) GS:ffff880009200000(0000) knlGS:0000000000000000
[ 3.416666] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 3.416666] CR2: ffffffffffffffaf CR3: 00000000023b7000 CR4: 00000000000006a0
[ 3.416666] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 3.523560] .. no entries found ..FAILED!
[ 3.523576] initcall init_function_trace+0x0/0x3e returned -1 after 139973 usecs
[ 3.523582] initcall init_function_trace+0x0/0x3e returned with error code -1
[ 3.523588] calling init_irqsoff_tracer+0x0/0x14 @ 1
[ 3.416666] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 3.416666] Process rcu_torture_rea (pid: 40, threadinfo ffff88003c870000, task ffff88003c8696)
[ 3.416666] Stack:
[ 3.416666] ffff88003c871d50 ffff88003c871fd8 ffff88003c869640 ffff88003c870000
[ 3.416666] <0> 0000000000000033 ffffffff8103995b 0000000000000001 000000000000002b
[ 3.416666] <0> ffff88003c871fd8 ffff88003c869640 0000000000000001 ffffffff8108d451
[ 3.416666] Call Trace:
[ 3.416666] [<ffffffff8103995b>] ? put_prev_task_fair+0x10/0xa4
[ 3.416666] [<ffffffff8108d451>] ? rcu_torture_reader+0x1dc/0x28c
[ 3.416666] [<ffffffff8108d456>] ? rcu_torture_reader+0x1e1/0x28c
[ 3.416666] [<ffffffff8108d17b>] ? rcu_torture_timer+0x0/0xfa
[ 3.416666] [<ffffffff8108d275>] ? rcu_torture_reader+0x0/0x28c
[ 3.416666] [<ffffffff8105a664>] ? kthread+0x9a/0xa2
[ 3.416666] [<ffffffff8106c483>] ? trace_hardirqs_on_caller+0x114/0x13f
[ 3.416666] [<ffffffff81003a54>] ? kernel_thread_helper+0x4/0x10
[ 3.416666] [<ffffffff810366e7>] ? finish_task_switch+0x70/0xa5
[ 3.416666] [<ffffffff81a5e1c0>] ? restore_args+0x0/0x30
[ 3.416666] [<ffffffff8105a5ca>] ? kthread+0x0/0xa2
[ 3.416666] [<ffffffff81003a50>] ? kernel_thread_helper+0x0/0x10
[ 3.416666] Code: 30 48 89 fe 48 89 df ff 50 30 48 8b 83 a8 00 00 00 48 39 43 40 74 09 49 c7 c
[ 3.416666] RIP [<ffffffff81a5b222>] schedule+0x33b/0x6ed
[ 3.416666] RSP <ffff88003c871d30>
[ 3.416666] CR2: ffffffffffffffaf
(same config) I'll try to bisect it.
Ingo
next prev parent reply other threads:[~2010-03-16 11:51 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-27 22:52 [PATCH tip/core/rcu 0/2] more lockdep-RCU and RCU_FAST_NO_HZ fixes Paul E. McKenney
2010-02-27 22:53 ` [PATCH tip/core/rcu 1/2] rcu: fix holdoff for accelerated GPs for last non-dynticked CPU Paul E. McKenney
2010-02-28 8:59 ` [tip:core/rcu] rcu: Fix " tip-bot for Paul E. McKenney
2010-03-16 11:00 ` Ingo Molnar
2010-03-16 11:03 ` Ingo Molnar
2010-03-16 11:51 ` Ingo Molnar [this message]
2010-03-16 12:15 ` Ingo Molnar
2010-03-16 13:30 ` Paul E. McKenney
2010-03-17 17:53 ` Ingo Molnar
2010-03-17 19:22 ` Paul E. McKenney
2010-03-17 19:35 ` Ingo Molnar
2010-02-27 22:53 ` [PATCH tip/core/rcu 2/2] rcu: make task_subsys_state() RCU-lockdep checks handle boot-time use Paul E. McKenney
2010-02-28 8:59 ` [tip:core/rcu] rcu: Make " tip-bot for Paul E. McKenney
2010-03-01 19:47 ` Paul Menage
2010-02-28 8:55 ` [PATCH tip/core/rcu 0/2] more lockdep-RCU and RCU_FAST_NO_HZ fixes Ingo Molnar
2010-02-28 16:32 ` Paul E. McKenney
2010-03-01 8:33 ` [tip:core/rcu] sched, rcu: Fix rcu_dereference() for RCU-lockdep tip-bot for Paul E. McKenney
2010-03-01 12:10 ` [PATCH tip/core/rcu 0/2] more lockdep-RCU and RCU_FAST_NO_HZ fixes Ingo Molnar
2010-03-01 16:08 ` Paul E. McKenney
2010-03-01 17:58 ` Peter Zijlstra
2010-03-01 18:50 ` Paul E. McKenney
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