Hi,

I'm having trouble booting a current kernel as of Aug. 1 on a
PowerBook 520.  It freezes right after the "root on sd0a dumps on sd0b"
line.  I can drop into ddb so I took a stack trace:

Panic switch: PC is 0x3804.
Stopped at      _Debugger+0x6:  unlk    a6
db> t
_Debugger(12caf6,3804,1dcdb8,35c0,0) + 6
_nmihand(0,0,0,2704,0) + 26
_lev7intr(?)
_mi_switch(2704,2200,6378d8,1dce78,46ec00) + 12
_tsleep(46d000,11,112bd2,0) + 178
_scsipi_execute_xs(46d000) + 9e
_scsi_scsipi_cmd(43de00,1dce78,6,1f20000,200,4,ea60,6378d8,801) + a0
_sdstart(46ee00,46eeb0,6378d8) + 1d2
_sdstrategy(6378d8,1000,c,401,46ec00) + c4
_readdisklabel(2,11a9d6,46ec00,43ef40) + 6c
_sdgetdisklabel(46ee00) + 5e
_sdopen(401,0,6000,0) + f4
_sdsize(401,2704,1da184,1d2200,60000000) + 56
_cpu_dumpconf(0,0) + 4c
_main(1e00280,11,2ea96,1e0000,1000) + 328
_low() + 2
db> x/i _mi_switch+12
_mi_switch+0x12:        bsrl    _microtime     [addr:0x12c944 ]
db>

"c" command to continue and then dropping into debugger later again
show *exactly* *the* *same* stack trace.

I'm asking this on this list because any of the function names in the
trace doesn't really look like MD.  Does anyone have any idea what
might be broken?  This is a GENERIC kernel.

Thanks,

Ken