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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: Rafael J. Wysocki [mailto:rjw@sisk.pl]
    >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@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...
    >
    >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


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