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    SubjectRE: [Bug #10117] 2.6.25-current-git sometimes hangs on boot -dual-core Sony Vaio
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    >-----Original Message-----
    >From: Soeren Sonnenburg [mailto:kernel@nn7.de]
    >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@sisk.pl]
    >> >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@nn7.de>
    >> >> > > > > 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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