Date: Mon, 19 Apr 2004 22:33:42 +0200 From: Bernd Walter <ticso@cicely12.cicely.de> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: panic booting off of a USB key Message-ID: <20040419203341.GV5279@cicely12.cicely.de> In-Reply-To: <200404191352.46793.jhb@FreeBSD.org> References: <20040417153007.GA1885@crodrigues.org> <200404191352.46793.jhb@FreeBSD.org>
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On Mon, Apr 19, 2004 at 01:52:46PM -0400, John Baldwin wrote: > On Saturday 17 April 2004 11:30 am, Craig Rodrigues wrote: > > Hi, > > > > I compiled a -current kernel from a few days ago. > > I put the kernel on a USB key. > > > > When I boot the kernel from the USB key, it starts > > up, but then panics sometime after the umass0 > > reports that it is attaching to the disk: > > > > > > > > > > ========================================================================= > > umass0: at uhub0 port 1 (addr 2) disconnected > > umass0: detached > > [0] f:80 typ:7 s(CHS):0/1/1 e(CHS):1023/254/63 s:63 l:117194112 > > [1] f:00 typ:0 s(CHS):0/0/0 e(CHS):0/0/0 s:0 l:0 > > [2] f:00 typ:0 s(CHS):0/0/0 e(CHS):0/0/0 s:0 l:0 > > [3] f:00 typ:0 s(CHS):0/0/0 e(CHS):0/0/0 s:0 l:0 > > GEOM: Configure ad0s1, start 32256 length 60003385344 end 60003417599 > > umass0: USB Solid state disk, rev 1.10/1.00, addr 2 > > umass0:1:0:-1: Attached to scbus1 > > > > > > Fatal trap 12: page fault while in kernel mode > > cpuid = 0; apic id = 00 > > fault virtual address = 0x0 > > fault code = supervisor read, page not present > > instruction pointer = 0x8:0xc0639e74 > > stack pointer = 0x10:0xdf4baaec > > frame pointer = 0x10:0xdf4baaf8 > > code segment = base 0x0, limit 0xfffff, type 0x1b > > = DPL 0, pres 1, def32 1, gran 1 > > processor eflags = interrupt enabled, resume, IOPL = 0 > > current process = 28 (swi8: tty:sio clock) > > kernel: type 12 trap, code=0 > > Stopped at _mtx_lock_flags+0x34: cmpl $0xc08a47bc,0(%ebx) > > db> t > > _mtx_lock_flags(0,0,c083d456,125,c08e5420,0,c083d456,124) at > > _mtx_lock_flags+0x34 vm_fault(c103b000,deadc000,1,0,c2279150) at > > vm_fault+0x20a > > trap_pfault(df4bac64,0,deadc0fe) at trap_pfault+0x104 > > trap(c08e0018,10,c0450010,c0452a18,0) at trap+0x2d9 > > calltrap() at calltrap+0x5 > > --- trap 0xc, eip = 0xc0451a02, esp = 0xdf4baca4, ebp = 0xdf4baca8 --- > > xpt_schedule_dev(deadc0f2,c64a5c18,1) at xpt_schedule_dev+0x36 > > Something accessed a free'd region of memory (see the references to 0xdeadc0de > or small offsets thereof). This function might be the place to start looking > to see which pointer is stale. It's the detaching of an scbus before cam has probed it what triggers this panic. I guess the detaching is triggered by ehci reprobe, but a detach can happen anytime with USB. Maybe some cam enlighted could tell something more about what we could do with this case. -- B.Walter BWCT http://www.bwct.de bernd@bwct.de info@bwct.de
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