* linux-next RCU complaint during boot
@ 2011-09-01 16:33 Valdis.Kletnieks
2011-09-02 1:44 ` Paul E. McKenney
0 siblings, 1 reply; 5+ messages in thread
From: Valdis.Kletnieks @ 2011-09-01 16:33 UTC (permalink / raw)
To: Paul E. McKenney; +Cc: linux-kernel
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Seen during boot of linux-next 20110831:
[ 8.823047] ------------[ cut here ]------------
[ 8.823177] WARNING: at kernel/rcutree.c:1821 rcu_needs_cpu_quick_check+0x6e/0x204()
[ 8.823314] Hardware name: Latitude E6500
[ 8.823418] Modules linked in:
[ 8.823601] Pid: 0, comm: swapper Not tainted 3.1.0-rc4-next-20110831-dirty #11
[ 8.823724] Call Trace:
[ 8.823824] <IRQ> [<ffffffff81039682>] warn_slowpath_common+0x7e/0x96
[ 8.824015] [<ffffffff81092467>] ? note_new_gpnum+0x32/0x96
[ 8.824034] [<ffffffff810396af>] warn_slowpath_null+0x15/0x17
[ 8.824034] [<ffffffff810917de>] rcu_needs_cpu_quick_check+0x6e/0x204
[ 8.824034] [<ffffffff81093df8>] rcu_needs_cpu+0x9/0xd
[ 8.824034] [<ffffffff81065933>] tick_nohz_stop_sched_tick+0x20a/0x420
[ 8.824034] [<ffffffff8103fd77>] irq_exit+0xd2/0xe0
[ 8.824034] [<ffffffff81018f91>] smp_apic_timer_interrupt+0x8b/0x99
[ 8.824034] [<ffffffff815a1b30>] apic_timer_interrupt+0x70/0x80
[ 8.824034] <EOI> [<ffffffff8159dbbf>] ? notifier_call_chain+0x20/0x81
[ 8.824034] [<ffffffff8159dc7e>] __atomic_notifier_call_chain+0x5e/0x90
[ 8.824034] [<ffffffff8159dc20>] ? notifier_call_chain+0x81/0x81
[ 8.824034] [<ffffffff8159dcbf>] atomic_notifier_call_chain+0xf/0x11
[ 8.824034] [<ffffffff8100092d>] cpu_idle+0xaf/0x102
[ 8.824034] [<ffffffff81569ddc>] rest_init+0xd0/0xd7
[ 8.824034] [<ffffffff81569d0c>] ? csum_partial_copy_generic+0x16c/0x16c
[ 8.824034] [<ffffffff81b31b09>] start_kernel+0x375/0x380
[ 8.824034] [<ffffffff81b3129f>] x86_64_start_reservations+0xaf/0xb3
[ 8.824034] [<ffffffff81b31393>] x86_64_start_kernel+0xf0/0xf7
[ 8.824034] ---[ end trace f6289633ba846f8f ]---
Any ideas?
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: linux-next RCU complaint during boot
2011-09-01 16:33 linux-next RCU complaint during boot Valdis.Kletnieks
@ 2011-09-02 1:44 ` Paul E. McKenney
2011-09-02 1:53 ` Frederic Weisbecker
0 siblings, 1 reply; 5+ messages in thread
From: Paul E. McKenney @ 2011-09-02 1:44 UTC (permalink / raw)
To: Valdis.Kletnieks; +Cc: linux-kernel, fweisbec
On Thu, Sep 01, 2011 at 12:33:37PM -0400, Valdis.Kletnieks@vt.edu wrote:
> Seen during boot of linux-next 20110831:
>
> [ 8.823047] ------------[ cut here ]------------
> [ 8.823177] WARNING: at kernel/rcutree.c:1821 rcu_needs_cpu_quick_check+0x6e/0x204()
> [ 8.823314] Hardware name: Latitude E6500
> [ 8.823418] Modules linked in:
> [ 8.823601] Pid: 0, comm: swapper Not tainted 3.1.0-rc4-next-20110831-dirty #11
> [ 8.823724] Call Trace:
> [ 8.823824] <IRQ> [<ffffffff81039682>] warn_slowpath_common+0x7e/0x96
> [ 8.824015] [<ffffffff81092467>] ? note_new_gpnum+0x32/0x96
> [ 8.824034] [<ffffffff810396af>] warn_slowpath_null+0x15/0x17
> [ 8.824034] [<ffffffff810917de>] rcu_needs_cpu_quick_check+0x6e/0x204
> [ 8.824034] [<ffffffff81093df8>] rcu_needs_cpu+0x9/0xd
> [ 8.824034] [<ffffffff81065933>] tick_nohz_stop_sched_tick+0x20a/0x420
> [ 8.824034] [<ffffffff8103fd77>] irq_exit+0xd2/0xe0
> [ 8.824034] [<ffffffff81018f91>] smp_apic_timer_interrupt+0x8b/0x99
> [ 8.824034] [<ffffffff815a1b30>] apic_timer_interrupt+0x70/0x80
> [ 8.824034] <EOI> [<ffffffff8159dbbf>] ? notifier_call_chain+0x20/0x81
> [ 8.824034] [<ffffffff8159dc7e>] __atomic_notifier_call_chain+0x5e/0x90
> [ 8.824034] [<ffffffff8159dc20>] ? notifier_call_chain+0x81/0x81
> [ 8.824034] [<ffffffff8159dcbf>] atomic_notifier_call_chain+0xf/0x11
> [ 8.824034] [<ffffffff8100092d>] cpu_idle+0xaf/0x102
> [ 8.824034] [<ffffffff81569ddc>] rest_init+0xd0/0xd7
> [ 8.824034] [<ffffffff81569d0c>] ? csum_partial_copy_generic+0x16c/0x16c
> [ 8.824034] [<ffffffff81b31b09>] start_kernel+0x375/0x380
> [ 8.824034] [<ffffffff81b3129f>] x86_64_start_reservations+0xaf/0xb3
> [ 8.824034] [<ffffffff81b31393>] x86_64_start_kernel+0xf0/0xf7
> [ 8.824034] ---[ end trace f6289633ba846f8f ]---
>
> Any ideas?
This is a bug where someone uses RCU at a time when RCU has been told
that the CPU is in dyntick-idle mode. Frederic Weisbecker has some
patches that should address this.
Thanx, Paul
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: linux-next RCU complaint during boot
2011-09-02 1:44 ` Paul E. McKenney
@ 2011-09-02 1:53 ` Frederic Weisbecker
2011-09-02 16:06 ` Valdis.Kletnieks
0 siblings, 1 reply; 5+ messages in thread
From: Frederic Weisbecker @ 2011-09-02 1:53 UTC (permalink / raw)
To: Paul E. McKenney; +Cc: Valdis.Kletnieks, linux-kernel
On Thu, Sep 01, 2011 at 06:44:24PM -0700, Paul E. McKenney wrote:
> On Thu, Sep 01, 2011 at 12:33:37PM -0400, Valdis.Kletnieks@vt.edu wrote:
> > Seen during boot of linux-next 20110831:
> >
> > [ 8.823047] ------------[ cut here ]------------
> > [ 8.823177] WARNING: at kernel/rcutree.c:1821 rcu_needs_cpu_quick_check+0x6e/0x204()
> > [ 8.823314] Hardware name: Latitude E6500
> > [ 8.823418] Modules linked in:
> > [ 8.823601] Pid: 0, comm: swapper Not tainted 3.1.0-rc4-next-20110831-dirty #11
> > [ 8.823724] Call Trace:
> > [ 8.823824] <IRQ> [<ffffffff81039682>] warn_slowpath_common+0x7e/0x96
> > [ 8.824015] [<ffffffff81092467>] ? note_new_gpnum+0x32/0x96
> > [ 8.824034] [<ffffffff810396af>] warn_slowpath_null+0x15/0x17
> > [ 8.824034] [<ffffffff810917de>] rcu_needs_cpu_quick_check+0x6e/0x204
> > [ 8.824034] [<ffffffff81093df8>] rcu_needs_cpu+0x9/0xd
> > [ 8.824034] [<ffffffff81065933>] tick_nohz_stop_sched_tick+0x20a/0x420
> > [ 8.824034] [<ffffffff8103fd77>] irq_exit+0xd2/0xe0
> > [ 8.824034] [<ffffffff81018f91>] smp_apic_timer_interrupt+0x8b/0x99
> > [ 8.824034] [<ffffffff815a1b30>] apic_timer_interrupt+0x70/0x80
> > [ 8.824034] <EOI> [<ffffffff8159dbbf>] ? notifier_call_chain+0x20/0x81
> > [ 8.824034] [<ffffffff8159dc7e>] __atomic_notifier_call_chain+0x5e/0x90
> > [ 8.824034] [<ffffffff8159dc20>] ? notifier_call_chain+0x81/0x81
> > [ 8.824034] [<ffffffff8159dcbf>] atomic_notifier_call_chain+0xf/0x11
> > [ 8.824034] [<ffffffff8100092d>] cpu_idle+0xaf/0x102
> > [ 8.824034] [<ffffffff81569ddc>] rest_init+0xd0/0xd7
> > [ 8.824034] [<ffffffff81569d0c>] ? csum_partial_copy_generic+0x16c/0x16c
> > [ 8.824034] [<ffffffff81b31b09>] start_kernel+0x375/0x380
> > [ 8.824034] [<ffffffff81b3129f>] x86_64_start_reservations+0xaf/0xb3
> > [ 8.824034] [<ffffffff81b31393>] x86_64_start_kernel+0xf0/0xf7
> > [ 8.824034] ---[ end trace f6289633ba846f8f ]---
> >
> > Any ideas?
>
> This is a bug where someone uses RCU at a time when RCU has been told
> that the CPU is in dyntick-idle mode. Frederic Weisbecker has some
> patches that should address this.
Yep, see there: https://lkml.org/lkml/2011/8/20/81
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: linux-next RCU complaint during boot
2011-09-02 1:53 ` Frederic Weisbecker
@ 2011-09-02 16:06 ` Valdis.Kletnieks
2011-09-02 16:37 ` Paul E. McKenney
0 siblings, 1 reply; 5+ messages in thread
From: Valdis.Kletnieks @ 2011-09-02 16:06 UTC (permalink / raw)
To: Frederic Weisbecker; +Cc: Paul E. McKenney, linux-kernel
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On Fri, 02 Sep 2011 03:53:32 +0200, Frederic Weisbecker said:
> On Thu, Sep 01, 2011 at 06:44:24PM -0700, Paul E. McKenney wrote:
> > This is a bug where someone uses RCU at a time when RCU has been told
> > that the CPU is in dyntick-idle mode. Frederic Weisbecker has some
> > patches that should address this.
>
> Yep, see there: https://lkml.org/lkml/2011/8/20/81
Hmm.. .would test, but didn't apply cleanly to -next from Wednesday. Of course,
I was trying to do it before corn flakes, so I probably got the patches out of order.
WIll re-try this evening if I get a chance.
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: linux-next RCU complaint during boot
2011-09-02 16:06 ` Valdis.Kletnieks
@ 2011-09-02 16:37 ` Paul E. McKenney
0 siblings, 0 replies; 5+ messages in thread
From: Paul E. McKenney @ 2011-09-02 16:37 UTC (permalink / raw)
To: Valdis.Kletnieks; +Cc: Frederic Weisbecker, linux-kernel
On Fri, Sep 02, 2011 at 12:06:43PM -0400, Valdis.Kletnieks@vt.edu wrote:
> On Fri, 02 Sep 2011 03:53:32 +0200, Frederic Weisbecker said:
> > On Thu, Sep 01, 2011 at 06:44:24PM -0700, Paul E. McKenney wrote:
>
> > > This is a bug where someone uses RCU at a time when RCU has been told
> > > that the CPU is in dyntick-idle mode. Frederic Weisbecker has some
> > > patches that should address this.
> >
> > Yep, see there: https://lkml.org/lkml/2011/8/20/81
>
> Hmm.. .would test, but didn't apply cleanly to -next from Wednesday. Of course,
> I was trying to do it before corn flakes, so I probably got the patches out of order.
> WIll re-try this evening if I get a chance.
I need to queue those patches anyway. With luck they will hit -rcu by
the end of the weekend.
Thanx, Paul
^ permalink raw reply [flat|nested] 5+ messages in thread
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2011-09-01 16:33 linux-next RCU complaint during boot Valdis.Kletnieks
2011-09-02 1:44 ` Paul E. McKenney
2011-09-02 1:53 ` Frederic Weisbecker
2011-09-02 16:06 ` Valdis.Kletnieks
2011-09-02 16:37 ` Paul E. McKenney
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