ses0 at umass-sim0 bus 0 scbus2 target 0 lun 1 ses0: Fixed Enclosure Services SPC-4 SCSI device ses0: Serial Number 57584A31453233465A574B31 ses0: 400.000MB/s transfers ses0: SCSI-3 ENC Device [ thread pid 0 tid 100805 ] Stopped at pmap_activate+0xc: std r0, r1, 0x10 db> bt Tracing pid 0 tid 100805 td 0xc000000029abd580 KDB: reentering KDB: stack backtrace: 0xc000000003742190: at kdb_backtrace+0x64 0xc0000000037422a0: at kdb_reenter+0x50 0xc000000003742310: at trap+0x130 0xc000000003742420: at powerpc_interrupt+0x128 0xc0000000037424b0: kernel DSI read trap @ 0x64656c706869780a by db_show_mdpcpu+0x1b4: srr1=0x9000000000001032 r1=0xc000000003742760 cr=0x20001234 xer=0x20040000 ctr=0 r2=0xc000000003a7c000 sr=0x40000000 saved LR(0x30383564626135) is invalid. db>