linux-kernel - Re: [tip:core/rcu] rcu: Fix holdoff for accelerated GPs for last non-dynticked CPU

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Date:	Tue, 16 Mar 2010 12:03:23 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	mingo@...hat.com, hpa@...or.com, paulmck@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org, tglx@...utronix.de
Cc:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:core/rcu] rcu: Fix holdoff for accelerated GPs for last
 non-dynticked CPU


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
[    4.596672]  [<ffffffff8108ca70>] ? rcu_torture_read_lock+0x17/0x41
[    4.600004]  [<ffffffff810361b4>] ? add_preempt_count+0x4/0x3b
[    4.603338]  [<ffffffff810a1159>] ? function_trace_call+0x16/0x97
[    4.606687]  [<ffffffff81002a16>] ? ftrace_call+0x5/0x2b
[    4.610004]  [<ffffffff810361b9>] ? add_preempt_count+0x9/0x3b
[    4.613341]  [<ffffffff8108ca70>] rcu_torture_read_lock+0x17/0x41
[    4.616672]  [<ffffffff8105a6e5>] ? kthread_should_stop+0x9/0x1e
[    4.620020]  [<ffffffff8108de73>] rcu_torture_reader+0x112/0x28c                               
[    4.623338]  [<ffffffff8108dc67>] ? rcu_torture_timer+0x0/0xfa                                 
[    4.626672]  [<ffffffff8108dd61>] ? rcu_torture_reader+0x0/0x28c                               
[    4.630005]  [<ffffffff8105a794>] kthread+0x9a/0xa2                                            
[    4.633353]  [<ffffffff8106c519>] ? trace_hardirqs_on_caller+0x114/0x13f                       
[    4.636671]  [<ffffffff81003a54>] kernel_thread_helper+0x4/0x10                                
[    4.640004]  [<ffffffff8103612d>] ? finish_task_switch+0x70/0xa5                               
[    4.643338]  [<ffffffff81a63080>] ? restore_args+0x0/0x30                                      
[    4.646687]  [<ffffffff8105a6fa>] ? kthread+0x0/0xa2                                           
[    4.650004]  [<ffffffff81003a50>] ? kernel_thread_helper+0x0/0x10         

and another config.

-tip commit:

 71881fe: Merge branch 'core/urgent'

bug is reproducible.

	Ingo

View attachment "config" of type "text/plain" (67285 bytes)