linux-kernel - Re: x86/mce: machine check warning during poweroff

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Date:	Sat, 14 Jan 2012 03:48:27 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	"Justin P. Mattock" <justinmattock@...il.com>
CC:	Andi Kleen <ak@...ux.intel.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ming Lei <tom.leiming@...il.com>,
	Djalal Harouni <tixxdz@...ndz.org>,
	Borislav Petkov <borislav.petkov@....com>,
	Tony Luck <tony.luck@...el.com>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Kay Sievers <kay.sievers@...y.org>,
	gouders@...bocholt.fh-gelsenkirchen.de,
	Marcos Souza <marcos.mage@...il.com>,
	Linux PM mailing list <linux-pm@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	prasad@...ux.vnet.ibm.com, Jeff Chua <jeff.chua.linux@...il.com>,
	Tejun Heo <tj@...nel.org>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: x86/mce: machine check warning during poweroff

On 01/14/2012 03:36 AM, Srivatsa S. Bhat wrote:

> On 01/14/2012 03:08 AM, Justin P. Mattock wrote:
> 
>>>
>>
>> this showed up using no_console_suspend
>>
>>
>>   131.875143] usb 5-1: device descriptor read/64, error -110
>> [  140.599340] PM: Syncing filesystems ... done.
>> [  140.815981] PM: Preparing system for mem sleep
>> [  140.829117] Freezing user space processes ... (elapsed 0.01 seconds)
>> done.
>> [  140.840150] Freezing remaining freezable tasks ...
>> [  147.079160] usb 5-1: device descriptor read/64, error -110
>> [  147.282166] usb 5-1: new full-speed USB device number 6 using uhci_hcd
>> [  157.686165] usb 5-1: device not accepting address 6, error -110
>> [  157.788183] usb 5-1: new full-speed USB device number 7 using uhci_hcd
>> [  160.849310]
>> [  160.849320] Freezing of tasks failed after 20.00 seconds (1 tasks
>> refusing to freeze, wq_busy=0):
> 
>> [  160.849460] khubd           D f5d90020     0    20      2 0x00000000
>> [  160.849471]  f5d95d50 00000046 f5d095d0 f5d90020 00000000 c16ec3c0
>> bce8e78a 00000024
>> [  160.849488]  c16ec3c0 bce7b7f6 00000024 f60063c0 f5d09170 f5d95d20
>> c120490b c1039aa6
>> [  160.849505]  00000000 00000046 c1721180 00000296 f5d95d70 f5d95d40
>> c1465208 00000000
>> [  160.849521] Call Trace:
>> [  160.849538]  [<c120490b>] ? do_raw_spin_lock+0x3b/0xf0
>> [  160.849548]  [<c1039aa6>] ? lock_timer_base.isra.24+0x26/0x50
>> [  160.849558]  [<c1465208>] ? _raw_spin_lock_irqsave+0x58/0x70
>> [  160.849567]  [<c1204a4e>] ? do_raw_spin_unlock+0x4e/0x90
>> [  160.849574]  [<c1463c30>] schedule+0x30/0x50
>> [  160.849582]  [<c1461b7f>] schedule_timeout+0x10f/0x1f0
>> [  160.849589]  [<c10396f0>] ? usleep_range+0x40/0x40
>> [  160.849597]  [<c1463ae0>] wait_for_common+0xb0/0x120
>> [  160.849605]  [<c1053bb0>] ? try_to_wake_up+0x260/0x260
>> [  160.849614]  [<c1463bdd>] wait_for_completion_timeout+0xd/0x10
>> [  160.849624]  [<c13250e1>] usb_start_wait_urb+0xb1/0xe0
>> [  160.849632]  [<c10e0101>] ? sys_swapon+0xab1/0xc50
>> [  160.849640]  [<c1325308>] usb_control_msg+0xb8/0xf0
>> [  160.849648]  [<c12ad1e8>] ? _dev_info+0x28/0x30
>> [  160.849656]  [<c131e627>] hub_port_init+0x627/0x710
>> [  160.849664]  [<c131d396>] ? usb_set_device_state+0x76/0x130
>> [  160.849672]  [<c1320906>] hub_thread+0x626/0x1080
>> [  160.849681]  [<c10515a1>] ? finish_task_switch+0x31/0xf0
>> [  160.849688]  [<c14635c0>] ? __schedule+0x3b0/0x7b0
>> [  160.849698]  [<c10490c0>] ? __init_waitqueue_head+0x50/0x50
>> [  160.849705]  [<c1050ef9>] ? complete+0x49/0x60
>> [  160.849713]  [<c13202e0>] ? usb_remote_wakeup+0x40/0x40
>> [  160.849720]  [<c1048928>] kthread+0x78/0x80
>> [  160.849728]  [<c10488b0>] ? __init_kthread_worker+0x60/0x60
>> [  160.849736]  [<c146b0fe>] kernel_thread_helper+0x6/0xd
>> [  160.849755]
>> [  160.849759] Restarting tasks ... done.
>> [  160.865733] power_supply BAT0: uevent
>> [  160.865737] power_supply BAT0: POWER_SUPPLY_NAME=BAT0
>> [  160.886551] power_supply BAT0: prop STATUS=Full
>> [  160.886562] power_supply BAT0: prop PRESENT=1
>> [  160.886570] power_supply BAT0: prop TECHNOLOGY=Unknown
>> [  160.886577] power_supply BAT0: prop CYCLE_COUNT=0
>>
>> I can supply full dmesg if needed.
>> a bisect on this should not take too long, just need the time to do so.
>>
>> last good kernel I have here is: 3.2.0-06541-gf33180c
>>
> 
> Freezing failure is a totally different problem. Freezing happens much
> before CPUs are taken offline and even before devices are suspended.
> But yes, if freezing fails, suspend fails too (it is aborted rather).
> And freezing failures are typically a bit harder to trigger since they
> occur due to some race conditions. But the suspend failure problem
> discussed earlier in this thread (while discussing the MCE warnings) is a
> deterministic thing and very easily reproducible.
> 


So, looks like we have got 2 problems: a)freezing failure apparently due to
usb related code b) suspend failure due to MCE overhaul.

Adding Tejun and Alan Stern to Cc.

Regards,
Srivatsa S. Bhat

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