while trying to upgrade a -current box with an older scsi hd a scsi error
seemed to have triggered a panic (actually the first ever on that box):

(da0:ahc0:0:0:0): READ(10). CDB: 28 0 0 4b 94 df 0 0 20 0
(da0:ahc0:0:0:0): CAM Status: SCSI Status Error
(da0:ahc0:0:0:0): SCSI Status: Check Condition
(da0:ahc0:0:0:0): RECOVERED ERROR info:4b94f5 csi:b,b9,2,a2 asc:18,2
(da0:ahc0:0:0:0): Recovered data - data auto-reallocated field replaceable unit1
(da0:ahc0:0:0:0): No Recovery Action Needed

Fatal trap 12: page fault while in kernel mode
fault virtual address   = 0x3e
fault code              = supervisor write, page not present
instruction pointer     = 0x8:0xc02d3241
stack pointer           = 0x10:0xcfd2d954
frame pointer           = 0x10:0xcfd2d96c
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         = 15268 (cpp0)
kernel: type 12 trap, code=0
Stopped at      vm_object_pip_add+0x21: addw    %si,0x3e(%ebx)
db> Context switches not allowed in the debugger.
db> tr
vm_object_pip_add(0,1,0,0,c1f1e000) at vm_object_pip_add+0x21
vm_fault(c0832000,c88c2000,2,0,c21b2b40) at vm_fault+0x212
trap_pfault(cfd2dab8,0,c88c2001) at trap_pfault+0x131
trap(18,10,10,c88c2001,c5c0add8) at trap+0x3ab
calltrap() at calltrap+0x5
--- trap 0xc, eip = 0xc03025cf, esp = 0xcfd2daf8, ebp = 0xcfd2db44 ---
generic_bzero(cfd2dba0,cfd2dbcc,c02be266,cfd2dba0,4) at generic_bzero+0xf
spec_vnoperate(cfd2dba0) at spec_vnoperate+0x13
ffs_getpages(cfd2dbd8) at ffs_getpages+0x406
vnode_pager_getpages(c1fac708,cfd2dc8c,10,0) at vnode_pager_getpages+0x62
vm_fault(c27883fc,28304000,1,0,c21b2b40) at vm_fault+0x6d6
trap_pfault(cfd2dd48,1,28304000,28304000,0) at trap_pfault+0xed
trap(2f,2f,2f,839e000,83a5008) at trap+0x22b
calltrap() at calltrap+0x5
--- trap 0xc, eip = 0x806e373, esp = 0xbfbfeff0, ebp = 0xbfbff008 ---

i don't know if fbsd is supposed to panic in case of such an error but i
think to remember similar cam/scsi errors under 4-stable that didn't
trigger a panic.
btw, this box is connected via a serial console at 9600 bps and while typing
at the ddb-prompt it swallowed most characters, i.e. i had to type single
characters up to four times.

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