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SubjectRe: resume from s2ram regression (bisected to ftrace...)
On Mon, Aug 11, 2008 at 02:27:01PM -0400, Steven Rostedt wrote:
> Rafael J. Wysocki wrote:
>> On Sunday, 10 of August 2008, Marcin Slusarz wrote:
>>
>>> On Sun, Aug 10, 2008 at 07:40:12PM +0200, Rafael J. Wysocki wrote:
>>>
>>>> On Sunday, 10 of August 2008, Marcin Slusarz wrote:
>>>>
>>>>> Hi
>>>>>
>>>>> Few days ago I discovered that resume from suspend to ram does not work
>>>>> anymore
>>>>> on my 2.6.27-rc2 (actually 796aadeb1b2db9b5d463946766c5bbfd7717158c)
>>>>> gentoo box.
>>>>> My computer just boots on resume. Today I had enough time to bisect it
>>>>> and found
>>>>> (after 1 panic and 1 build breakage) out "the reason":
>>>>>
>>>>> $ git bisect good
>>>>> d05cdb25d80f06f77aa6bddb53cd1390d4d91a0b is first bad commit
>>>>> commit d05cdb25d80f06f77aa6bddb53cd1390d4d91a0b
>>>>> Author: Steven Rostedt <rostedt@goodmis.org>
>>>>> Date: Mon May 12 21:20:54 2008 +0200
>>>>>
>>>>> ftrace: fix dynamic ftrace selftest
>>>>>
>>>> Does it still happen if:
>>>> - CONFIG_FTRACE is unset
>>>>
>>> no
>>>
>>>
>>>> - CONFIG_FTRACE is set, but CONFIG_FTRACE_STARTUP_TEST is unset?
>>>>
>>> yes
>>>
>>
>> Thanks for testing.
>>
>> Well, ftrace is a new feature in 2.6.27, IIRC, so this is not a regression
>> in
>> the strict sense.
>>
>> Still, of couse, there is a bug in ftrace that needs to be fixed. Steven?
>>
> Sorry for the late response.
>
> Red Hat changed its mail servers, and my mail was in limbo for a while.
>
> I'm not doubting that FTRACE enabled breaks suspend to ram, but I find it
> highly unlikely that the commit you posted was the culprit. Especially
> since it still breaks when STARTUP_TEST is disabled. That change was a
> STARTUP_TEST change only. Perhaps it just moved things around enough to
> cause your issues.
>
> But you say that if you take Linus's latest git tree, and revert only this
> change, it works??

Yes.

> Hmm, this is very strange.

I agree. Any idea how to debug it?

Marcin


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