Date: Tue, 18 May 2010 22:47:24 -0500 From: Brandon Gooch <jamesbrandongooch@gmail.com> To: Giovanni Trematerra <giovanni.trematerra@gmail.com> Cc: freebsd-acpi@freebsd.org, freebsd-stable@freebsd.org Subject: Re: Kernel panic when unpluggin AC adaptor Message-ID: <AANLkTik-MdP8EY6-ei4I9FAmLRa2oBWqHxMKdQmy2UbK@mail.gmail.com> In-Reply-To: <AANLkTil5qkn1PFSoss1A7HTuYDh9Dfab7XfxIuBWylNG@mail.gmail.com> References: <4DEBDE2C-C0D2-469D-AC42-DD5027926424@FreeBSD.org> <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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On Tue, May 18, 2010 at 9:04 AM, 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. Applied the patch, built, installed, and booted new kernel: no panic! I will remove WITNESS_SKIPSPIN and build another kernel. Then I'll "try" to trigger the panic (by letting my laptop sit idle after a buildworld session). Thanks for giving this some attention, I hope you and/or others are able to get to the bottom of this... -Brandon
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