RE: [Bug #10117] 2.6.25-current-git sometimes hangs on boot -dual-core Sony Vaio

[Pallipadi, Venkatesh]

>-----Original Message-----
>From: Soeren Sonnenburg [mailto:kernel@xxxxxx] 
>Sent: Tuesday, April 15, 2008 2:18 PM
>To: Pallipadi, Venkatesh
>Cc: Rafael J. Wysocki; Adrian Bunk; Carlos R. Mafra; Linux 
>Kernel Mailing List
>Subject: RE: [Bug #10117] 2.6.25-current-git sometimes hangs 
>on boot -dual-core Sony Vaio
>
>On Tue, 2008-04-15 at 14:09 -0700, Pallipadi, Venkatesh wrote:
>> 
>> >-----Original Message-----
>> >From: Rafael J. Wysocki [mailto:rjw@xxxxxxx] 
>> >Sent: Tuesday, April 15, 2008 2:04 PM
>> >To: Adrian Bunk
>> >Cc: Carlos R. Mafra; Linux Kernel Mailing List; Soeren 
>> >Sonnenburg; Pallipadi, Venkatesh
>> >Subject: Re: [Bug #10117] 2.6.25-current-git sometimes hangs 
>> >on boot - dual-core Sony Vaio
>> >
>> >On Tuesday, 15 of April 2008, Adrian Bunk wrote:
>> >> On Tue, Apr 15, 2008 at 10:33:38PM +0200, Rafael J. Wysocki wrote:
>> >> > On Tuesday, 15 of April 2008, Carlos R. Mafra wrote:
>> >> > > On Sun 13.Apr'08 at 17:25:45 -0300, Carlos R. Mafra wrote:
>> >> > > > On Sun 13.Apr'08 at 20:56:41 +0200, Rafael J. Wysocki wrote:
>> >> > > > > This message has been generated automatically as a 
>> >part of a report
>> >> > > > > of recent regressions.
>> >> > > > > 
>> >> > > > > The following bug entry is on the current list of 
>> >known regressions
>> >> > > > > from 2.6.24.  Please verify if it still should be listed.
>> >> > > > > 
>> >> > > > > 
>> >> > > > > Bug-Entry	: 
>> >http://bugzilla.kernel.org/show_bug.cgi?id=10117
>> >> > > > > Subject		: 2.6.25-current-git sometimes 
>> >hangs on boot - dual-core Sony Vaio
>> >> > > > > Submitter	: Soeren Sonnenburg <kernel@xxxxxx>
>> >> > > > > Date		: 2008-02-23 18:55 (51 days old)
>> >> > > > > References	: http://lkml.org/lkml/2008/2/23/263
>> >> > > > > 		  http://lkml.org/lkml/2008/4/4/41
>> >> > > > > 		  http://lkml.org/lkml/2008/4/9/69
>> >> > > > 
>> >> > > > Soeren said it no longer happens to him in 
>> >http://lkml.org/lkml/2008/4/9/53
>> >> > > > but unfortunately it still happens with me using -rc9. 
>> >So I kidnapped his 
>> >> > > > bugzilla report :-)
>> >> > > > 
>> >> > > > In the bugzilla entry I said earlier today that 
>> >"hpet=disable" apparently
>> >> > > > makes the problem go away (42 boots OK so far, whereas 
>> >without this
>> >> > > > boot option it hangs ~90% using vga=6 and ~10% using 
>> >vga=0x0364)
>> >> > > > 
>> >> > > > I tried to bisect it, but sometimes in pre 2.6.25-rc1 
>> >kernels it takes
>> >> > > > 30 boots before the first hang to occur. So bisection 
>> >is not reliable...
>> >> > > > 
>> >> > > > If someone proposes a patch I will be glad to test it!
>> >> > > > 
>> >> > > > PS: The similar bug in buzilla 10377 also appears 
>to be "fixed"
>> >> > > > by using hpet=disable, see comment #17 in that bug.
>> >> > > 
>> >> > > 
>> >> > > From what Mark Lord said in his comments #33 to #35 in 
>> >> > > http://bugzilla.kernel.org/show_bug.cgi?id=10117
>> >> > > it appears that this is a much older regression, from 
>april 2007.
>> >> > > 
>> >> > > So this is a regression, but not from 2.6.24 (although somehow
>> >> > > it never hit me before). I don't know about the 
>policy of closing
>> >> > > regressions that come from way before the previous 
>> >kernel version, 
>> >> > > if there is any. Then I will let you manage the 
>bugzilla #10117
>> >> > > as you see fit (but I will be "there" to hopefuly test any 
>> >> > > proposed patches).
>> >> > 
>> >> > I dropped the bug from the list of recent regressions, so 
>> >it doesn't block
>> >> > bug #9832 any more.  However, this still is a bug and 
>> >regression, so the
>> >> > bugzilla entry remains open.
>> >> 
>> >> Soerens original report was a 2.6.25 regression.
>> >> 
>> >> And #10377 that was closed as a duplicate of #10117 was also 
>> >reported as 
>> >> a 2.6.25 regression.
>> >> 
>> >> #10117 seems to suffer from the common disease of people 
>> >hijacking an 
>> >> existing bug, but Soeren's issue that was what was 
>> >originally tracked in 
>> >> #10117 is (or was) a 2.6.25 regression.
>> >
>> >Well, I'm really not 100% sure it was a regression from 2.6.24 
>> >and I'm not
>> >sure bug #10377 should have been marked as a duplicate.
>> >
>> >I made bug #10117 block bug #9832 again, but it would be nice 
>> >to sort this out.
>> >
>> >Why do we think that the cause of bugs #10117 and #10377 is 
>the same?
>> >
>> >Rafael
>> >
>> 
>> Both of them probabilistically hang early in the boot.
>> On both !CPUIDLE and hpet=disable seems to be working around the
>> problem.
>> Both are Core 2 Duo based with 64 bit kernel.
>> 
>> One difference I saw was that #10377 fails on battery. That may be
>> because when on battery CPUs may be running at lower freq during boot
>> and that is probably helping this problem in terms of timing.
>
>FWIW, this macbook pro1,1 has only a core 1 duo, so x86 == 32bit...
>Soeren
>

Sorry. When I said Core 2, I was referring to Carlos and his updates on
#10117.

Thanks,
Venki
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