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
Cc: linux-tip-commits@vger.kernel.org
Subject: Re: [tip:core/rcu] rcu: Fix holdoff for accelerated GPs for last non-dynticked CPU
Date: Wed, 17 Mar 2010 18:53:11 +0100 [thread overview]
Message-ID: <20100317175311.GA5187@elte.hu> (raw)
In-Reply-To: <20100316110323.GA31038@elte.hu>
* Ingo Molnar <mingo@elte.hu> wrote:
> incidentally i have a RCU badness crash log from another box:
>
> [ 4.573332] initcall ipmi_init_msghandler_mod+0x0/0xd returned 0 after 0 usecs
> [ 4.573332] calling init_ipmi_si+0x0/0x435 @ 1
> [ 4.573332] IPMI System Interface driver.
> [ 4.573340] [<ffffffff81022cdc>] no_context+0x1fc/0x20b
> [ 4.576672] [<ffffffff81002a16>] ? ftrace_call+0x5/0x2b
> [ 4.580021] [<ffffffff81022e77>] __bad_area_nosemaphore+0x18c/0x1af
> [ 4.583338] [<ffffffff81002a16>] ? ftrace_call+0x5/0x2b
> [ 4.586672] [<ffffffff81022ead>] bad_area_nosemaphore+0x13/0x15
> [ 4.590005] [<ffffffff81023159>] do_page_fault+0x138/0x284
> [ 4.593354] [<ffffffff81a632bf>] page_fault+0x1f/0x30
I spent a few hours yesterday and today trying to track this down, but failed
to bisect it. The crash is sporadic on many configs - which confused my
bisection attempts. Sometimes it crashes only after 10 reboots. Was able to
crash v2.6.30 as well, so it's an older bug. v2.6.29 was not testable on that
box due to network driver problems so i stopped there.
Ingo
next prev parent reply other threads:[~2010-03-17 17:53 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
2010-03-16 12:15 ` Ingo Molnar
2010-03-16 13:30 ` Paul E. McKenney
2010-03-17 17:53 ` Ingo Molnar [this message]
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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