dmesg:

sd1(ahc0:1:0) Check Condition (error 0) on opcode 0x2a
ahc0: target 0 using asynchronous transfers
ahc0: target 1 using asynchronous transfers
panic:  HOST_MSG_LOOP with invalid SCB f6
stopped at Debugger+0x4  leave

trace:

Debugger(d694e000,7,1,0,a0) at Debugger+0x4
Panic(d064c540,f6d0823bd4,d2bbb6bc,d694fb90) at panic+0x63
ahc_handle_seqint(d0a19c00,61,0,d2c5bb08) at ahc_adapter_req_set_xfer_mode+0x650
xrecurse_legacy11() at xrecurse_legacy11+0x61
---interupt---
ufs_rename(d694fe08,d2bb5000,d2b2c700,d2c4b1e0,d07389c0) at ufs_rename+0x8f6
VOP_RENAME(d2bba30c,d2bb5000,d694fedc,d2bba30c,0) at VOP_RENAME+0x40
sys_rename(d2b2c700,d694ff68,d694ff58,cfbe3e40,14) at sys_rename+0x125
syscall() at syscall+0x24a
---syscall (number 128)---
0x33a20e5