linux-kernel - Re: linux-next: Tree for April 14 (Call-traces: RCU/ACPI/WQ related?)

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Date:	Fri, 15 Apr 2011 00:19:34 +0200
From:	Sedat Dilek <sedat.dilek@...glemail.com>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
Cc:	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: linux-next: Tree for April 14 (Call-traces: RCU/ACPI/WQ related?)

On Thu, Apr 14, 2011 at 12:19 PM, Sedat Dilek
<sedat.dilek@...glemail.com> wrote:
> On Thu, Apr 14, 2011 at 11:16 AM, Sedat Dilek
> <sedat.dilek@...glemail.com> wrote:
>> [ Adding CC to RCU maintainer (Hi Paul :-)) ]
>>
>> Helping me for now with (see also Documentation/RCU/stallwarn.txt):
>>
>> # cat /sys/module/rcutree/parameters/rcu_cpu_stall_suppress
>> 0
>>
>> # echo "1" > /sys/module/rcutree/parameters/rcu_cpu_stall_suppress
>>
>> # cat /sys/module/rcutree/parameters/rcu_cpu_stall_suppress
>> 1
>>
>> - Sedat -
>>
>
> That workaround helped till a system-freeze when generating a tarball
> from my current kernel-tree.
> I switched back to my yesterday's linux-next kernel.
>
> - Sedat -
>

I isolated the culprit so far:

commit 900507fc62d5ba0164c07878dbc36ac97866a858
"rcu: move TREE_RCU from softirq to kthread"

With this revert my system does not show the symptoms I have reported.


- Sedat -

>> On Thu, Apr 14, 2011 at 10:59 AM, Sedat Dilek
>> <sedat.dilek@...glemail.com> wrote:
>>> On Thu, Apr 14, 2011 at 7:01 AM, Stephen Rothwell <sfr@...b.auug.org.au> wrote:
>>>> Hi all,
>>>>
>>>> Changes since 20110413:
>>>>
>>>> Dropped tree: xen
>>>>
>>>> The gfs2 tree lost its conflict.
>>>>
>>>> The net tree lost its build failure.
>>>>
>>>> The wireless tree lost all but one conflict.
>>>>
>>>> The trivial tree lost its conflict.
>>>>
>>>> The tip tree gained a conflict against Linus' tree.
>>>>
>>>> The usb tree gained a conflict against the s5p tree.
>>>>
>>>> The staging tree lost its conflicts.
>>>>
>>>> ----------------------------------------------------------------------------
>>>
>>> Just a quick hello and an attached dmesg.
>>> Yesterday's linux-next (next-20110413) with same kernel-config was OK.
>>>
>>> ( Also, I have seen a section-mismatch in x86 (IIRC mm) missing
>>> __init... but that's another story. )
>>>
>>> - Sedat -
>>>
>>> P.S.: diff between today's and yesterday's kernel-config
>>>
>>> $ diff -uprN /boot/config-2.6.39-rc3-next20110413.2-686-small
>>> /boot/config-2.6.39-rc3-next20110414.2-686-small
>>> --- /boot/config-2.6.39-rc3-next20110413.2-686-small    2011-04-13
>>> 12:32:09.000000000 +0200
>>> +++ /boot/config-2.6.39-rc3-next20110414.2-686-small    2011-04-14
>>> 10:23:25.000000000 +0200
>>> @@ -1,7 +1,7 @@
>>>  #
>>>  # Automatically generated make config: don't edit
>>>  # Linux/x86 2.6.39-rc3 Kernel Configuration
>>> -# Wed Apr 13 11:55:54 2011
>>> +# Thu Apr 14 09:43:03 2011
>>>  #
>>>  # CONFIG_64BIT is not set
>>>  CONFIG_X86_32=y
>>> @@ -2602,6 +2602,7 @@ CONFIG_USB_UHCI_HCD=m
>>>  #
>>>  # Enable Host or Gadget support to see Inventra options
>>>  #
>>> +# CONFIG_USB_RENESAS_USBHS is not set
>>>
>>>  #
>>>  # USB Device Class drivers
>>>
>>
>
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