From: Dave Jones <davej@redhat.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Rusty Russell <rusty@rustcorp.com.au>,
Linus Torvalds <torvalds@linux-foundation.org>,
Yinghai Lu <yinghai@kernel.org>, Avi Kivity <avi@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
cpufreq@vger.kernel.org, mark.langsdorf@amd.com
Subject: Re: S06cpuspeed/2637 is trying to acquire lock (&(&dbs_info->work)->work (was: Re: [PATCH 4/6] x86/cpufreq: use cpumask_copy instead of =)
Date: Wed, 10 Jun 2009 16:58:48 -0400 [thread overview]
Message-ID: <20090610205848.GA1445@redhat.com> (raw)
In-Reply-To: <20090610111035.GG27724@elte.hu>
On Wed, Jun 10, 2009 at 01:10:35PM +0200, Ingo Molnar wrote:
>
> With a v2.6.30 based kernel i'm still getting a cpufreq lockdep
> warning:
>
> =======================================================
> [ INFO: possible circular locking dependency detected ]
> 2.6.30-tip #10420
> -------------------------------------------------------
> S06cpuspeed/2637 is trying to acquire lock:
> (&(&dbs_info->work)->work){+.+...}, at: [<ffffffff8106553d>] __cancel_work_timer+0xd6/0x22a
>
> but task is already holding lock:
> (dbs_mutex){+.+.+.}, at: [<ffffffff8193d630>] cpufreq_governor_dbs+0x28f/0x335
>
> This bug got introduced somewhere late in the .30-rc cycle, this box
> was fine before.
See the thread " [PATCH] remove rwsem lock from CPUFREQ_GOV_STOP call (second call site)"
Though there's a report that the last patch posted still doesn't fix the problem,
so we still don't have a quick fix suitable for -stable.
It's this .. http://bugzilla.kernel.org/show_bug.cgi?id=13493
b14893a62c73af0eca414cfed505b8c09efc613c fixed one locking problem, but
introduced this as a side-effect. The whole thing is a mess really.
Dave
next prev parent reply other threads:[~2009-06-10 21:00 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-04 21:00 [PATCH] kvm: fix kvm reboot crash when MAXSMP is used Yinghai Lu
2009-06-04 21:01 ` [PATCH] cpumask: alloc blank cpumask left over Yinghai Lu
2009-06-05 4:58 ` Rusty Russell
2009-06-05 5:18 ` Avi Kivity
2009-06-05 5:56 ` Yinghai Lu
2009-06-05 13:41 ` Rusty Russell
2009-06-05 17:34 ` Linus Torvalds
2009-06-05 17:46 ` Yinghai Lu
2009-06-05 17:57 ` Yinghai Lu
2009-06-06 23:40 ` Rusty Russell
2009-06-06 23:43 ` Rusty Russell
2009-06-06 9:22 ` Avi Kivity
2009-06-06 9:36 ` Yinghai Lu
2009-06-06 9:39 ` Avi Kivity
2009-06-06 10:57 ` Yinghai Lu
2009-06-06 21:50 ` [PATCH 1/6] cpumask: introduce zalloc_cpumask_var Yinghai Lu
2009-06-06 21:51 ` Subject: [PATCH 2/6] cpumask: alloc zeroed cpumask for static cpumask_var_ts Yinghai Lu
2009-06-06 21:52 ` [PATCH 3/6] kvm: fix kvm reboot crash when MAXSMP is used Yinghai Lu
2009-06-06 21:53 ` [PATCH 4/6] x86/cpufreq: use cpumask_copy instead of = Yinghai Lu
2009-06-09 6:57 ` Rusty Russell
2009-06-09 8:13 ` Yinghai Lu
2009-06-10 4:20 ` Rusty Russell
2009-06-10 13:39 ` Dave Jones
2009-06-10 17:01 ` Ingo Molnar
2009-06-09 15:46 ` Linus Torvalds
2009-06-09 16:28 ` Dave Jones
2009-06-09 16:41 ` Linus Torvalds
2009-06-10 4:55 ` Rusty Russell
2009-06-10 6:22 ` Rusty Russell
2009-06-10 11:10 ` S06cpuspeed/2637 is trying to acquire lock (&(&dbs_info->work)->work (was: Re: [PATCH 4/6] x86/cpufreq: use cpumask_copy instead of =) Ingo Molnar
2009-06-10 20:58 ` Dave Jones [this message]
2009-06-11 10:52 ` Ingo Molnar
2009-06-20 12:48 ` Ingo Molnar
2009-06-21 19:55 ` Thomas Renninger
2009-06-23 18:17 ` [PATCH] cpufreq: remove dbs_mutex Ingo Molnar
2009-06-23 18:40 ` Ingo Molnar
2009-06-23 18:51 ` Pallipadi, Venkatesh
2009-06-23 19:14 ` Ingo Molnar
2009-06-23 19:24 ` Pallipadi, Venkatesh
2009-06-23 19:32 ` Ingo Molnar
2009-06-25 14:01 ` Fix dead lock in cpufreq for CPU hotplug and suspend for 2.6.30.stable Thomas Renninger
2009-06-25 14:06 ` Thomas Renninger
2009-06-25 14:01 ` [PATCH 1/2] CPUFREQ: Remove unneeded dbs_mutexes from ondemand and conservative governors Thomas Renninger
2009-06-25 14:25 ` Mathieu Desnoyers
2009-06-25 15:03 ` Pallipadi, Venkatesh
2009-06-25 22:17 ` Thomas Renninger
2009-06-25 22:26 ` Thomas Renninger
2009-06-30 6:33 ` Pavel Machek
2009-07-03 10:10 ` Thomas Renninger
2009-07-05 19:46 ` Pavel Machek
2009-06-30 22:58 ` [stable] " Greg KH
2009-06-30 23:14 ` Mathieu Desnoyers
2009-06-30 23:39 ` Greg KH
2009-07-01 9:07 ` Thomas Renninger
2009-06-25 14:01 ` [PATCH 2/2] remove rwsem lock from CPUFREQ_GOV_STOP call (second call site) Thomas Renninger
2009-06-10 19:42 ` [PATCH 4/6] x86/cpufreq: use cpumask_copy instead of = Langsdorf, Mark
2009-06-11 2:34 ` Rusty Russell
2009-09-21 16:44 ` Langsdorf, Mark
2009-06-06 21:55 ` [PATCH 5/6] core: use cpumask_copy instead of = for cpus_allowed in fork Yinghai Lu
2009-06-06 21:56 ` [PATCH 6/6] x86/cpufreq: don't use SPEEDSTEP with MAXSMP Yinghai Lu
2009-06-06 21:56 ` [PATCH 1/6] cpumask: introduce zalloc_cpumask_var Andrew Morton
2009-06-06 22:07 ` Yinghai Lu
2009-06-06 21:58 ` Linus Torvalds
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