RE: linux-next boots then hangs...

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Hi,

If this series matters, probably the only one should get bisected is:
https://patchwork.kernel.org/patch/9087971/
Have you tried:
If this series applied without the above commit, boots hangs can still occur?

Thanks and best regards
-Lv

> From: Wysocki, Rafael J
> Subject: Re: linux-next boots then hangs...
> 
> Let's involve the author of the commits in question (and CC linux-acpi too).
> 
> On 6/8/2016 6:18 PM, Mike Marshall wrote:
> > Hello everyone...
> >
> > The problem is gone today, and it looks like Rafael
> > dropped the ACPICA changes from linux-next.
> 
> Indeed, I did that.
> 
> Now, it would be good if you could help to identify which of them
> exactly introduced the problem.
> 
> Those patches are available in the kernel.org Patchwork as:
> 
> https://patchwork.kernel.org/patch/9087951/
> https://patchwork.kernel.org/patch/9088001/
> https://patchwork.kernel.org/patch/9088021/
> https://patchwork.kernel.org/patch/9087971/
> 
> plus one fix on top of them:
> 
> https://patchwork.kernel.org/patch/9157765/
> 
> The ordering of the links above should reflect the correct order of the
> patches (or you can verify that by looking at their subjects).
> 
> Can you please try to apply them one by one (they should apply on top of
> the current mainline) and see which one breaks things for you?
> 
> Thanks,
> Rafael
> 
> 
> > Now linux-next has an Oops at leaf_walk_rcu and
> > is not usable <g>... I think I see people on LKML
> > talking about it.
> >
> > Thanks...
> >
> > -Mike
> >
> > On Tue, Jun 7, 2016 at 2:58 PM, Mike Marshall
> <hubcap@xxxxxxxxxxxx> wrote:
> >> Well, I started the bisect again, using Paolo's suggestion.
> >>
> >> It lead me in a circle back to 407aa3f.
> >>
> >> It could be that I'm not competent to perform this bisect, barring
> >> that - it could be that the "bad" code only emerged as the result
> >> of 407aa3f, which, according to the commit message, was a merge of
> >> 41 commits...
> >>
> >> As to my bisect competency, sometimes (usually) the next bisect point
> >> would be a place where 7f9bef9 wouldn't apply. I would only find out
> >> that 7f9bef9 wouldn't apply by running the cherry pick, so each time
> >> I'd have to clean up the failed cherry pick before I could continue,
> >> which I did like this:
> >>
> >> git cherry-pick -n 7f9bef9                    <-- fail
> >>
> >> git reset HEAD drivers/acpi/acpica/hwregs.c   <-- to unstage
> >>
> >> git checkout -- drivers/acpi/acpica/hwregs.c  <-- discard cherry pick
> wreckage
> >>
> >> Anyhow, I hope I'm being helpful, and not obstructionist, by trying
> >> to follow up on this. Good luck Rafael, I'll definitely try
> >> linux-next tomorrow.
> >>
> >> # git bisect log
> >> git bisect start
> >> # bad: [407aa3ff6f54ea2be7959639d664ae5183e2e9f8] Merge branch
> 'acpica'
> >> git bisect bad 407aa3ff6f54ea2be7959639d664ae5183e2e9f8
> >> # good: [7f9bef9debafcb767d00efb177d0f2edd4940eab] ACPICA /
> Hardware:
> >> Fix old register check in acpi_hw_get_access_bit_width()
> >> git bisect good 7f9bef9debafcb767d00efb177d0f2edd4940eab
> >> # good: [d1ce3bb95511dacf8b9eea899c421f1b18a3ef6a] Merge back
> new
> >> ACPICA material for v4.7.
> >> git bisect good d1ce3bb95511dacf8b9eea899c421f1b18a3ef6a
> >> # good: [d1ce3bb95511dacf8b9eea899c421f1b18a3ef6a] Merge back
> new
> >> ACPICA material for v4.7.
> >> git bisect good d1ce3bb95511dacf8b9eea899c421f1b18a3ef6a
> >> # good: [21a9703de3045cda0b3aaa5bc193d2e1062908d2] Merge
> branch
> >> 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
> >> git bisect good 21a9703de3045cda0b3aaa5bc193d2e1062908d2
> >> # good: [dd287690b0aa4b0d22e8dd7dd2cb3055f5141a27] Merge tag
> >> 'arc-4.6-rc7-fixes' of
> >> git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc
> >> git bisect good dd287690b0aa4b0d22e8dd7dd2cb3055f5141a27
> >> # good: [35cd3f4563c4a0fc99be300afc7b82a822e634c7] Merge
> branch
> >> 'for-4.6-fixes' of
> >> git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata
> >> git bisect good 35cd3f4563c4a0fc99be300afc7b82a822e634c7
> >> # good: [3f8f0cf2eddb558e5ccf9b155e758f4b950d8697] Merge tag
> >> 'usb-4.6-rc7' of
> >> git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
> >> git bisect good 3f8f0cf2eddb558e5ccf9b155e758f4b950d8697
> >> # good: [2b86c4a84377b74a6ec0ec9463feb0803bcb1066] Merge tag
> >> 'iio-fixes-for-4.6d' of
> >> git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into
> >> staging-linus
> >> git bisect good 2b86c4a84377b74a6ec0ec9463feb0803bcb1066
> >> # good: [d1306eb675ad7a9a760b6b8e8e189824b8db89e7] nvmem:
> mxs-ocotp:
> >> fix buffer overflow in read
> >> git bisect good d1306eb675ad7a9a760b6b8e8e189824b8db89e7
> >> # good: [32cf95db22d49cf4a3b421ba9fd156bb5f920ebb] Merge tag
> >> 'char-misc-4.6-rc7' of
> >> git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
> >> git bisect good 32cf95db22d49cf4a3b421ba9fd156bb5f920ebb
> >> # good: [44549e8f5eea4e0a41b487b63e616cb089922b99] Linux 4.6-
> rc7
> >> git bisect good 44549e8f5eea4e0a41b487b63e616cb089922b99
> >> # first bad commit: [407aa3ff6f54ea2be7959639d664ae5183e2e9f8]
> Merge
> >> branch 'acpica'
> >>
> >> On Tue, Jun 7, 2016 at 11:14 AM, Rafael J. Wysocki
> >> <rafael.j.wysocki@xxxxxxxxx> wrote:
> >>> On 6/7/2016 5:08 PM, Mike Marshall wrote:
> >>>> I'm one of the original reporters and testers of that problem/fix...
> >>>> my current problem started after that... I've tested
> >>>> next-20160607 and 4.7.0-rc2-00004-g3613a62 (Linus' tree
> >>>> of the moment) so far today... Linus' tree is still OK (because
> >>>> it has 7f9bef9) and linux-next is still busted (for me).
> >>>>
> >>>> I'll keep on bisecting using the suggestions that Paolo sent...
> >>>
> >>> I see.
> >>>
> >>> I think I'll need to drop the latest ACPICA changes from linux-next then.
> >>>
> >>> Let me try to do that and please test linux-next again tomorrow.
> >>>
> >>> Thanks,
> >>> Rafael
> >>>
> >>>
> >>>
> >>>> On Tue, Jun 7, 2016 at 10:55 AM, Rafael J. Wysocki
> >>>> <rafael.j.wysocki@xxxxxxxxx> wrote:
> >>>>> On 6/6/2016 10:56 PM, Mike Marshall wrote:
> >>>>>> Greetings...
> >>>>>>
> >>>>>> Please keep my email in the loop on this, I'm only subscribed
> >>>>>> to fs-devel...
> >>>>>>
> >>>>>> Linux-next fails to boot properly for me, but Linux 4.7-rc2 from
> >>>>>> Linus' tree boots fine.
> >>>>>>
> >>>>>> I got started bisecting next-20160603 last Friday, but didn't get
> done.
> >>>>>>
> >>>>>> git bisect start '64289ca' '7f9bef9'
> >>>>>>
> >>>>>> I picked 7f9bef9 as the good commit to start with because I knew
> >>>>>> I needed 7f9bef9 or else my QEMU-KVM would crash. Before I
> started
> >>>>>> the bisection, I verified that 7f9bef9 was indeed good by checking
> >>>>>> out a branch from next-20160603 with 7f9bef9 as the HEAD and
> >>>>>> building it: git checkout -b gas 7f9bef9
> >>>>>>
> >>>>>> Today I got next-20160606 and checked to see if the same failure
> >>>>>> occurred - it did. So I continued with the bisection of next-
> 20160603.
> >>>>>>
> >>>>>> I arrived at 407aa3ff6f54ea2be7959639d664ae5183e2e9f8 as the
> bad commit.
> >>>>>>
> >>>>>>
> >>>>>> 407aa3f is a rather complex commit... there is a problem with it,
> >>>>>> but I'm not sure what to do next... both 7f9bef9 and 407aa3f are
> >>>>>> related to ACPICA...
> >>>>>
> >>>>> It looks like this commit
> >>>>>
> >>>>>
> >>>>> https://git.kernel.org/cgit/linux/kernel/git/rafael/linux-
> pm.git/commit/?h=acpica-
> fixes&id=7f9bef9debafcb767d00efb177d0f2edd4940eab
> >>>>>
> >>>>> should fix the problem for you.
> >>>>>
> >>>>> Thanks,
> >>>>> Rafael
> >>>>>

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