What does this mean (after brief freeze)?

sd0(ahc0:0:0): SCB 1a - timed out while idle, SEQADDR == 0xb
SCSIRATE == 0x0
sd0(ahc0:0:0): Queuing a BDR SCB
sd0(ahc0:0:0): Bus Device Reset Message Sent
sd0(ahc0:0:0): no longer in timeout, status = 0
ahc0: Bus Device Reset on A:0. 4 SCBs aborted
ahc0: target 0 synchronous at 20.0MHz, offset = 0xf
sd0(ahc0:0:0): undecodable sense error for opcode 0x2a, data= 0x00 0x00 0x00 0x00

From dmesg:

ahc0 at pci2 dev 10 function 0
ahc0: interrupting at irq 14
ahc0: aic7860 Single Channel A, SCSI Id=7, 3/255 SCBs
scsibus0 at ahc0 channel 0: 8 targets, 8 luns per target
ahc0: target 0 synchronous at 20.0MHz, offset = 0xf
ahc0: target 0 using tagged queuing
sd0 at scsibus0 target 0 lun 0: <IBM, DNES-318350, SA30> SCSI3 0/direct fixed
sd0: 17501 MB, 11474 cyl, 10 head, 312 sec, 512 bytes/sect x 35843670 sectors
ahc0: target 2 synchronous at 20.0MHz, offset = 0xf
ahc0: target 2 using tagged queuing
sd1 at scsibus0 target 2 lun 0: <QUANTUM, XP34550S, LYK8> SCSI2 0/direct fixed
sd1: 4341 MB, 5899 cyl, 10 head, 150 sec, 512 bytes/sect x 8890760 sectors

Could it be related to kern/11180? (Source of Nov 22 18:34 GMT)

(Side note: I had /usr/obj as lfs on sd1 which always froze during make
cleandir. Changing to ffs shows many sd1(ahc0:2:0): queue full)

Cheers,

Patrick