panic booting off of a USB key

[Craig Rodrigues]

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
xpt_release_devq_device(c64a5c00,1,1,df4bad04,c064ea3e) at xpt_release_devq_device+0x99
xpt_release_devq_timeout(c64a5c00) at xpt_release_devq_timeout+0xf
softclock(0) at softclock+0x176
ithread_loop(c615f300,df4bad48,c615f300,c0631c94,0) at ithread_loop+0x11c
fork_exit(c0631c94,c615f300,df4bad48) at fork_exit+0xa8
fork_trampoline() at fork_trampoline+0x8
--- trap 0x1, eip = 0, esp = 0xdf4bad7c, ebp = 0 ---
db> 
=========================================================================


Here is some more info on my USB key, if I stick it into
another running system:


umass0: USB Solid state disk, rev 1.10/1.00, addr 2
umass0:0:0:-1: Attached to scbus0
pass0 at umass-sim0 bus 0 target 0 lun 0ected
pass0: <Memorex ThumbDrive 1.12> Removable Direct Access SCSI-2 device
pass0: Serial Number 0/1/1 e(CHS):1023/254/63 s:63 l:117194112
pass0: 1.000MB/s transfers0 e(CHS):0/0/0 s:0 l:0
GEOM: new disk da0HS):0/0/0 e(CHS):0/0/0 s:0 l:0
da0 at umass-sim0 bus 0 target 0 lun 0/0 s:0 l:0
da0: <Memorex ThumbDrive 1.12> Removable Direct Access SCSI-2 device
da0: Serial Number ate disk, rev 1.10/1.00, addr 2
da0: 1.000MB/s transfersto scbus1
da0: 252MB (516096 512 byte sectors: 64H 32S/T 252C)
[0] f:80 typ:165 s(CHS):0/1/1 e(CHS):251/63/32 s:32 l:516064
[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 da0s1, start 16384 length 264224768 end 264241151
GEOM: Configure da0a, start 8192 length 264232960 end 264241151
GEOM: Configure da0c, start 0 length 264241152 end 264241151
GEOM: Configure da0s1a, start 8192 length 264216576 end 264224767
GEOM: Configure da0s1c, start 0 length 264224768 end 264224767





-- 
Craig Rodrigues        
http://crodrigues.org
rodrigc at crodrigues.org