linux-kernel - Re: 3.4+ tty lockdep trace

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Message-ID: <CA+1xoqemV-zsM3wZKDrirNopqVoH7PbHKijFCGQK2HuSDAN+CA@mail.gmail.com>
Date:	Fri, 25 May 2012 12:24:01 +0200
From:	Sasha Levin <levinsasha928@...il.com>
To:	Ming Lei <tom.leiming@...il.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Alan Cox <alan@...ux.intel.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: 3.4+ tty lockdep trace

On Fri, May 25, 2012 at 10:30 AM, Ming Lei <tom.leiming@...il.com> wrote:
> On Fri, May 25, 2012 at 4:07 PM, Sasha Levin <levinsasha928@...il.com> wrote:
>> On Fri, May 25, 2012 at 4:32 AM, Steven Rostedt <rostedt@...dmis.org> wrote:
>>> On Thu, May 24, 2012 at 03:54:57PM +0100, Alan Cox wrote:
>>>> On Thu, 24 May 2012 13:24:56 +0200
>>>> Sasha Levin <levinsasha928@...il.com> wrote:
>>>> >
>>>> > And here is the second one attached as well, so these are two
>>>> > different warnings I get with the new version.
>>>>
>>>>
>>>> I'm somewhat baffled by this one. Can lockdep be fooled by an object
>>>> being freed and reallocated at the same address, Is there any markup
>>>> that should be present to avoid that ?
>>>
>>> Sasha,
>>>
>>> Did you apply Ming's second patch. His first patch (the one referenced
>>> in the email) didn't have the unlock fixup.
>>
>> Nope, I just got the first one.
>>
>> What's the right patchset to use atm? I know about these patches from
>> Ming, and I see Alan sent out two patches yesterday. Which ones should
>> I use for testing?
>
> You can try to apply my 2nd patch against Alan's two patches for the tests.

Applying Ming's patch over Alan's 2 patches from yesterday, I'm still
seeing two lockdep warnings. Full trace attached.

View attachment "tty_lockdep3.txt" of type "text/plain" (10366 bytes)