Date: Fri, 14 May 2010 02:54:13 +0200 From: Attilio Rao <attilio@freebsd.org> 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: <AANLkTinkS_ELhMdUhXIrsmvN7ydOF6OyuyI2QwLSRoFv@mail.gmail.com> In-Reply-To: <AANLkTin3IucElH1cBEW8uGXRmetLvMeTx5GWzq3fjrz0@mail.gmail.com> References: <4DEBDE2C-C0D2-469D-AC42-DD5027926424@FreeBSD.org> <k2u4e6cba831005070922vfc3bcf18i59551da3b40317a@mail.gmail.com> <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>
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2010/5/14 Giovanni Trematerra <giovanni.trematerra@gmail.com>: > 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. I have still to review it completely, hope to do that asap. Attilio -- Peace can only be achieved by understanding - A. Einstein
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