A dmesg warning

[Илья Анохин]

Hi fellows.

I've recently installed FreeBSD-5.3-RELEASE at my 3.0 GHz Intel Pentium 
Server with Adaptec SCSI controllers and a couple of Seagate U-SCSI320 
hard disks. After re-compiling the kernel with support of ipfw and smp, 
dmesg shows the following warnings.

---- begin of dmesg output ----
Waiting 15 seconds for SCSI devices to settle
ahd0: Invalid Sequencer interrupt occurred.
 >>>>>>>>>>>>>>>>>> Dump Card State Begins <<<<<<<<<<<<<<<<<
ahd0: Dumping Card State at program address 0x235 Mode 0x0
Card was paused
INTSTAT[0x0] SELOID[0x1] SELID[0x0] HS_MAILBOX[0x0]
INTCTL[0x80]:(SWTMINTMASK) SEQINTSTAT[0x0] SAVED_MODE[0x11]
DFFSTAT[0x33]:(CURRFIFO_NONE|FIFO0FREE|FIFO1FREE)
SCSISIGI[0x0]:(P_DATAOUT) SCSIPHASE[0x0] SCSIBUS[0x0]
LASTPHASE[0x1]:(P_DATAOUT|P_BUSFREE) SCSISEQ0[0x0]
SCSISEQ1[0x12]:(ENAUTOATNP|ENRSELI) SEQCTL0[0x0] 
SEQINTCTL[0x6]:(INTMASK1|INTMASK2)
SEQ_FLAGS[0x0] SEQ_FLAGS2[0x0] QFREEZE_COUNT[0x2]
KERNEL_QFREEZE_COUNT[0x2] MK_MESSAGE_SCB[0xff00] MK_MESSAGE_SCSIID[0xff]
SSTAT0[0x0] SSTAT1[0x0] SSTAT2[0x0] SSTAT3[0x0] PERRDIAG[0x0]
SIMODE1[0xa4]:(ENSCSIPERR|ENSCSIRST|ENSELTIMO) LQISTAT0[0x0]
LQISTAT1[0x0] LQISTAT2[0x0] LQOSTAT0[0x0] LQOSTAT1[0x0]
LQOSTAT2[0x0]

SCB Count = 16 CMDS_PENDING = 0 LASTSCB 0xffff CURRSCB 0xf NEXTSCB 0xff40
qinstart = 31 qinfifonext = 31
QINFIFO:
WAITING_TID_QUEUES:
Pending list:
Total 0
Kernel Free SCB list: 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 0
Sequencer Complete DMA-inprog list:
Sequencer Complete list:
Sequencer DMA-Up and Complete list:
Sequencer On QFreeze and Complete list:


ahd0: FIFO0 Free, LONGJMP == 0x8000, SCB 0x1
SEQIMODE[0x3f]:(ENCFG4TCMD|ENCFG4ICMD|ENCFG4TSTAT|ENCFG4ISTAT|ENCFG4DATA|ENSAVEPTRS)
SEQINTSRC[0x0] DFCNTRL[0x0] DFSTATUS[0x89]:(FIFOEMP|HDONE|PRELOAD_AVAIL)
SG_CACHE_SHADOW[0x2]:(LAST_SEG) SG_STATE[0x0] DFFSXFRCTL[0x0]
SOFFCNT[0x0] MDFFSTAT[0x5]:(FIFOFREE|DLZERO) SHADDR = 0x00, SHCNT = 0x0
HADDR = 0x00, HCNT = 0x0 CCSGCTL[0x10]:(SG_CACHE_AVAIL)

ahd0: FIFO1 Free, LONGJMP == 0x8063, SCB 0xf
SEQIMODE[0x3f]:(ENCFG4TCMD|ENCFG4ICMD|ENCFG4TSTAT|ENCFG4ISTAT|ENCFG4DATA|ENSAVEPTRS)
SEQINTSRC[0x0] DFCNTRL[0x0] DFSTATUS[0x89]:(FIFOEMP|HDONE|PRELOAD_AVAIL)
SG_CACHE_SHADOW[0x2]:(LAST_SEG) SG_STATE[0x0] DFFSXFRCTL[0x0]
SOFFCNT[0x0] MDFFSTAT[0x5]:(FIFOFREE|DLZERO) SHADDR = 0x00, SHCNT = 0x0
HADDR = 0x00, HCNT = 0x0 CCSGCTL[0x10]:(SG_CACHE_AVAIL)
LQIN: 0x8 0x0 0x0 0x1 0x0 0x4 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 
0x0 0x0 0x0 0x0
ahd0: LQISTATE = 0x0, LQOSTATE = 0x0, OPTIONMODE = 0x42
ahd0: OS_SPACE_CNT = 0x20 MAXCMDCNT = 0x1
ahd0: SAVED_SCSIID = 0x0 SAVED_LUN = 0x0

SIMODE0[0xc]:(ENOVERRUN|ENIOERR)
CCSCBCTL[0x4]:(CCSCBDIR)
ahd0: REG0 == 0xc160, SINDEX = 0x180, DINDEX = 0x104
ahd0: SCBPTR == 0x1, SCB_NEXT == 0xff40, SCB_NEXT2 == 0xff29
CDB 12 80 0 80 88 b1
STACK: 0x230 0x1 0x0 0x0 0x0 0x0 0x0 0x0
<<<<<<<<<<<<<<<<< Dump Card State Ends >>>>>>>>>>>>>>>>>>
Copied 18 bytes of sense data offset 12: 0x70 0x0 0x6 0x0 0x0 0x0 0x0 
0xa 0x0 0x0 0x0 0x0 0x29 0x2 0x2 0x0 0x0 0x0
Copied 18 bytes of sense data offset 12: 0x70 0x0 0x6 0x0 0x0 0x0 0x0 
0xa 0x0 0x0 0x0 0x0 0x29 0x2 0x2 0x0 0x0 0x0
SMP: AP CPU #1 Launched!
da0 at ahd0 bus 0 target 0 lun 0
da0: <SEAGATE ST336607LW 0007> Fixed Direct Access SCSI-3 device
da0: 320.000MB/s transfers (160.000MHz, offset 63, 16bit), Tagged 
Queueing Enabled
da0: 35003MB (71687372 512 byte sectors: 255H 63S/T 4462C)
da1 at ahd0 bus 0 target 1 lun 0
da1: <SEAGATE ST336607LW 0007> Fixed Direct Access SCSI-3 device
da1: 320.000MB/s transfers (160.000MHz, offset 63, 16bit), Tagged 
Queueing Enabled
da1: 35003MB (71687372 512 byte sectors: 255H 63S/T 4462C)
---- end of dmesg output ----

As u can see both of HDD's are launched successfully, and I didn't 
notice any malfunction in system. What is it? May it cause a system 
failure (software or hardware)? Is it possible to get rid of it?


--
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Yours truly, daem0n