Date: Wed, 19 May 2010 04:16:02 +0900 From: Taku YAMAMOTO <taku@tackymt.homeip.net> To: freebsd-acpi@freebsd.org Subject: Re: Kernel panic when unpluggin AC adaptor Message-ID: <20100519041602.2ccd714c.taku@tackymt.homeip.net> In-Reply-To: <AANLkTil5qkn1PFSoss1A7HTuYDh9Dfab7XfxIuBWylNG@mail.gmail.com> References: <4DEBDE2C-C0D2-469D-AC42-DD5027926424@FreeBSD.org> <1273257226.1671.3.camel@malikania.fr> <AANLkTilcNzzLt2GUPbL_Vqjspzx5a-oem1oZpKAYqoN8@mail.gmail.com> <AANLkTilq-j6y4QDwZScs0RVkHoZ9pUDk21quc36VIO1T@mail.gmail.com> <AANLkTimHK_Ho1qfoLO35GuxUFLLUux6CUNnIFxvMywIN@mail.gmail.com> <AANLkTiku4rZ0kuOC2ZWo11Sq_jhZSiMhDJDvLKyR0r4R@mail.gmail.com> <l2w3bbf2fe11005120741h4b3fdafape563a973a939bbe8@mail.gmail.com> <AANLkTim6vVdVFPRwZJk7hRfOSYMjMQyfjbfwG3t9uTsW@mail.gmail.com> <AANLkTin3IucElH1cBEW8uGXRmetLvMeTx5GWzq3fjrz0@mail.gmail.com> <AANLkTin6awXSstytBRuEHxK22YZlGZ_ry5M9oNzhrZ5c@mail.gmail.com> <AANLkTil5qkn1PFSoss1A7HTuYDh9Dfab7XfxIuBWylNG@mail.gmail.com>
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Is it faster to call sched_bind() temporarily in acpi_cpu_notify()
than locking around many places?
If we successfully sched_bind() to the subject CPU, I think we're guaranteed
that the acpi_cpu_idle() is not running on that CPU.
On Tue, 18 May 2010 16:04:07 +0200
Giovanni Trematerra <giovanni.trematerra@gmail.com> wrote:
> On Sat, May 15, 2010 at 9:12 PM, Brandon Gooch
> <jamesbrandongooch@gmail.com> wrote:
> > On Thu, May 13, 2010 at 7:25 PM, Giovanni Trematerra
> > <giovanni.trematerra@gmail.com> wrote:
> >> On Thu, May 13, 2010 at 1:09 AM, Brandon Gooch
> >> <jamesbrandongooch@gmail.com> wrote:
> >>> On Wed, May 12, 2010 at 9:41 AM, Attilio Rao <attilio@freebsd.org> wrote:
> >>>> 2010/5/12 David DEMELIER <demelier.david@gmail.com>:
> >>>>> I remove the patch, and built the kernel (I updated the src this
> >>>>> morning) and it does not panic now. It's really odd. If it reappears
> >>>>> soon I will tell you.
> >>>>
> >>>> I looked at the code with Giovanni and I have the feeling that the
> >>>> race with the idle thread may still be fatal.
> >>>> We need to fix that.
> >>>>
> >>>> Attilio
> >>>>
> >>>
> >>> That seems to be the case, as my laptop shows about an 80-85 % chance
> >>> of experiencing a panic if left idle for long-ish periods of time (2
> >>> to 4 hours). I usually rebuild world or big ports overnight, and more
> >>> often than not I wake up to a panicked machine, same situation every
> >>> time:
> >>>
> >>> ...
> >>> rman_get_bushandle() at rman_get_bushandle+0x1
> >>> sched_idletd() at sched_idletd+0x123
> >>> fork_exit() at fork_exit+0x12a
> >>> fork_trampoline() at fork_trampoline+0xe
> >>> ...
> >>>
> >>> The kernel/userland is rebuilt, the ports are finished compiling --
> >>> it's in the time AFTER the completion of all tasks that the machine
> >>> gets bored and tries to kill itself :)
> >>>
> >>> I have seen the AC adapter plug/unplug "hang" in the past on this
> >>> laptop, but I never made the connection between the events, as
> >>> nowadays my laptop usually stays plugged in :(
> >>>
> >>> Attilio, I hope you can track this one down, let me know if I can do
> >>> anything to help or test...
> >>>
> >>
> >> Attilio and I came up with this patch. It seems ready for stress
> >> testing and review
> >> Please test and report back.
> >>
> >> Thank you
> >>
> >> P.S: all the faults are only mine.
> >
> > I tried the patch, and my kernel panics I panic on boot. I have
> > 8.5MB(!) of JPG images (6 of them) if anyone needs to see them. I'm
> > looking for a place to post them, but if anyone wants, I can send via
> > e-mail...
>
> Hi Brandon,
> Could you please, try this new one? The panic at boot stage should be solved,
> at least I tried on a 8-way machine and all went ok at boot.
> Please, remove WITNESS_SKIPSPIN from your kernel config file.
> This patch might be sub-optimal and contains style(9) error but if it
> works we are
> on the right way.
> Let me know if it works for you.
>
> Thanks
>
> --
> Gianni
>
--
-|-__ 山本 拓 / YAMAMOTO, Taku
| __ < <taku@tackymt.homeip.net>
- A chicken is an egg's way of producing more eggs. -
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