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

[Pallipadi, Venkatesh]

>-----Original Message-----
>From: Rafael J. Wysocki [mailto:rjw@xxxxxxx] 
>Sent: Tuesday, April 15, 2008 2:24 PM
>To: Soeren Sonnenburg
>Cc: Pallipadi, Venkatesh; 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 Tuesday, 15 of April 2008, Soeren Sonnenburg wrote:
>> 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...
>
>So I think we should leave bug #10117 to track the original 
>issue (hangs on
>MacBook Pro1.1 w/ Intel Core Duo x86-32), reopen bug #10377 
>and use that
>to track the Core 2 Duo 64-bit issues.
>
>Any objections to that?
>

Last I heard from Soeren, this was not reproducable on 32 bit any more.
All recent updates on #10117 from Carlos is on Core-2 Duo 64 bit. If the
problem is still reproducable on 32 bit then probably having 2 bugzillas
to track is fine with me.

Thanks,
Venki
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/