Date: Thu, 17 Apr 2008 12:33:10 +0300 From: Andriy Gapon <avg@icyb.net.ua> To: Steve Franks <stevefranks@ieee.org>, freebsd-stable@freebsd.org Subject: Re: umass causes panic on 7 amd64 Message-ID: <48071956.2090103@icyb.net.ua> In-Reply-To: <1208373797.00057829.1208362805@10.7.7.3> References: <1207959807.00055755.1207949401@10.7.7.3> <1208046195.00056100.1208036121@10.7.7.3> <539c60b90804141549u6a138ad9u9c77bbfcbbad0ff3@mail.gmail.com> <20080415175347.GA29045@slackbox.xs4all.nl> <539c60b90804151134q7a25a141m1205a1b04d8ffc2c@mail.gmail.com> <20080415192028.GA31706@slackbox.xs4all.nl> <539c60b90804160910q3a242d7amb474b40065d6c9c6@mail.gmail.com> <1208373797.00057829.1208362805@10.7.7.3>
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on 16/04/2008 19:19 Roland Smith said the following: > On Wed, Apr 16, 2008 at 09:10:23AM -0700, Steve Franks wrote: >> Fatal trap 12: page fault while in kernel mode >> cpuid = 0; apic id = 00 >> fault virtual address = 0x0 >> fault code = supervisor read instruction, page not present >> instruction pointer = 0x8:0x0 >> stack pointer = 0x10:0xffffffffa0208570 >> frame pointer = 0x10:0xffffff0001e1ca00 >> code segment = base 0x0, limit 0xfffff, type 0x1b >> = DPL 0, pres 1, long 1, def32 0, gran 1 >> processor eflags = interrupt enabled, resume, IOPL = 0 >> current process = 12 (swi4: clock sio) > > Odd. This doesn't seem to have anything to do with usb. It is in a > kernel thread that runs the clock and serial port. It is not as odd if you consider that "clock" is actually softclock that executes timeouts/callouts and I have no doubts that we do use those in USB subsystem. > > If you give the 'bt' command (backtrace) here, what does it say? I think 'bt' should be a default command in kgdb init or at least there should be a big advice to the users: "if you managed to run kgdb on a core file, then at the very least execute bt command" :-) -- Andriy Gapon
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