Date: Wed, 12 May 2010 18:09:02 -0500 From: Brandon Gooch <jamesbrandongooch@gmail.com> To: Attilio Rao <attilio@freebsd.org> Cc: David DEMELIER <demelier.david@gmail.com>, Giovanni Trematerra <giovanni.trematerra@gmail.com>, freebsd-stable@freebsd.org Subject: Re: Kernel panic when unpluggin AC adaptor Message-ID: <AANLkTim6vVdVFPRwZJk7hRfOSYMjMQyfjbfwG3t9uTsW@mail.gmail.com> In-Reply-To: <l2w3bbf2fe11005120741h4b3fdafape563a973a939bbe8@mail.gmail.com> References: <4DEBDE2C-C0D2-469D-AC42-DD5027926424@FreeBSD.org> <i2j4e6cba831005070159qa3df06ccw925073a05a1057f7@mail.gmail.com> <20100507120843.GA1738@Melon.malikania.fr> <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>
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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... -Brandon
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