linux-kernel - RE: Possible regression: BUG in fs/sysfs/group.c:65

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Date:	Tue, 9 Oct 2012 05:44:22 +0000
From:	"Wei, Gang" <gang.wei@...el.com>
To:	Kent Yoder <key@...ux.vnet.ibm.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Ben Guthro <ben@...hro.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Wei, Gang" <gang.wei@...el.com>
Subject: RE: Possible regression: BUG in fs/sysfs/group.c:65

Kent Yoder wrote on 2012-10-06:
> On Fri, Oct 05, 2012 at 11:16:06AM -0700, Eric W. Biederman wrote:
>> Ben Guthro <ben@...hro.net> writes:
>> 
>>> I am seeing a regression in today's (Oct 5) kernel - 2 WARNINGS, and a
>>> BUG below that seems to occur upon resuming from S3.
>>> 
>>> I can start a bisection with 3.6 - but wanted to check to see if
>>> anyone else is also experiencing this failure...
>> 
>> I took a quick look and this is a deterministic failure.  The same
>> file is being added to sysfs twice.
>> 
>> Since the routine causing this failure appears to be sys_add_ppi I
>> expect the commit that added this failure mode is the commit below.
>> 
>> Xiaoyan Zhang, Kent Yoder can you guys look at this see why the tpm
>> code is adding itself multiple times into sysfs?
> 
>   It looks like the ppi sysfs teardown code is MIA. Xiaoyan, can you add
> it to tpm_ppi.c, with a caller in tpm_unregister_hardware?

I will try to provide a fix.

Jimmy

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