5.0.18: "Bad scbptr 255 during SELTO"

[Elgin Lee]

I just installed Linux kernel 2.0.34, updated with the 5.0.18 Adaptec
driver.  This setup seems to work reasonably so far, except that I
often get error messages like

    (scsi0:-1:-1:-1) Bad scbptr 255 during SELTO.
    (scsi0:-1:-1:-1) Referenced SCB 255 not valid during SELTO.
            SCSISEQ = 0x12 SEQADDR = 0xb SSTAT0 = 0x10 SSTAT1 = 0x8a

during startup.  This is not always the case, however--sometimes I
get what looks like a success message:

    (scsi0:-1:-1:-1) Allocating initial 30 SCB structures.

Are the error messages something that I should be concerned about?

Further information:  I'm running two Adaptec 2940UW controllers,
and I use

        append="aic7xxx=reverse_scan,verbose"

in my /etc/lilo.conf.  Please see below for an excerpt from my
startup messages.

--Elgin

--------------------

aic7xxx: <Adaptec AHA-294X Ultra SCSI host adapter> at PCI 11/0
aic7xxx: Please verify driver detected settings are correct.
aic7xxx: If not, then please properly set the device termination
aic7xxx: in the Adaptec SCSI BIOS by hitting CTRL-A when prompted
aic7xxx: during machine bootup.
aic7xxx: Cables present (Int-50 YES, Int-68 NO, Ext-68 YES)
aic7xxx: Termination (Low OFF, High ON)
(scsi0) <Adaptec AHA-294X Ultra SCSI host adapter> found at PCI 15/0
(scsi0) Wide Channel, SCSI ID=7, 16/255 SCBs
(scsi0) BIOS enabled, IO Port 0xfc00, IRQ 10
(scsi0) IO Memory at 0xffbeb000, MMAP Memory at 0x481d000
(scsi0) Resetting channel
(scsi0) Downloading sequencer code... 413 instructions downloaded
(scsi1) <Adaptec AHA-294X Ultra SCSI host adapter> found at PCI 11/0
(scsi1) Wide Channel, SCSI ID=7, 16/255 SCBs
(scsi1) BIOS enabled, IO Port 0xf800, IRQ 3
(scsi1) IO Memory at 0xffbea000, MMAP Memory at 0x481f000
(scsi1) Resetting channel
(scsi1) Downloading sequencer code... 413 instructions downloaded
scsi0 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 5.0.18/3.2.4
       <Adaptec AHA-294X Ultra SCSI host adapter>
scsi1 : Adaptec AHA274x/284x/294x (EISA/VLB/PCI-Fast SCSI) 5.0.18/3.2.4
       <Adaptec AHA-294X Ultra SCSI host adapter>
scsi : 2 hosts.
(scsi0:0:-1:-1) Scanning channel for devices.
  Vendor: SEAGATE   Model: ST32550N          Rev: 0019
  Type:   Direct-Access                      ANSI SCSI revision: 02
Detected scsi disk sda at scsi0, channel 0, id 0, lun 0
  Vendor: IBM       Model: DORS-32160        Rev: S82C
  Type:   Direct-Access                      ANSI SCSI revision: 02
Detected scsi disk sdb at scsi0, channel 0, id 1, lun 0
  Vendor: PLEXTOR   Model: CD-ROM PX-12CS    Rev: 1.00
  Type:   CD-ROM                             ANSI SCSI revision: 02
Detected scsi CD-ROM sr0 at scsi0, channel 0, id 3, lun 0
(scsi1:0:-1:-1) Scanning channel for devices.
  Vendor: QUANTUM   Model: VIKING 4.5 NSE    Rev: 8808
  Type:   Direct-Access                      ANSI SCSI revision: 02
Detected scsi disk sdc at scsi1, channel 0, id 0, lun 0
(scsi0:-1:-1:-1) Bad scbptr 255 during SELTO.
(scsi0:-1:-1:-1) Referenced SCB 255 not valid during SELTO.
        SCSISEQ = 0x12 SEQADDR = 0xb SSTAT0 = 0x10 SSTAT1 = 0x8a
  Vendor: IOMEGA    Model: ZIP 100           Rev: D.09
  Type:   Direct-Access                      ANSI SCSI revision: 02
Detected scsi removable disk sdd at scsi1, channel 0, id 5, lun 0
scsi : detected 1 SCSI cdrom 4 SCSI disks total.
(scsi0:0:0:0) Synchronous at 10.0MHz, offset 15.
SCSI device sda: hdwr sector= 512 bytes. Sectors= 4194058 [2047 MB] [2.0 GB]
(scsi0:0:1:0) Synchronous at 10.0MHz, offset 15.
SCSI device sdb: hdwr sector= 512 bytes. Sectors= 4226725 [2063 MB] [2.1 GB]
(scsi1:0:0:0) Synchronous at 20.0MHz, offset 15.
SCSI device sdc: hdwr sector= 512 bytes. Sectors= 8899737 [4345 MB] [4.3 GB]
sdd : READ CAPACITY failed.
sdd : status = 1, message = 00, host = 0, driver = 28 
sdd : extended sense code = 2 
sdd : block size assumed to be 512 bytes, disk size 1GB.  
PPP: version 2.2.0 (dynamic channel allocation)
TCP compression code copyright 1989 Regents of the University of California
PPP Dynamic channel allocation code copyright 1995 Caldera, Inc.
PPP line discipline registered.
eth0: 3Com 3c595 Vortex 100baseTX at 0xff80, 00:a0:24:95:e2:a6, IRQ 9
  64K word-wide RAM 3:1 Rx:Tx split, autoselect/10baseT interface.
eth0: Overriding PCI latency timer (CFLT) setting of 24, new value is 248.
3c59x.c:v0.99E 5/12/98 Donald Becker http://cesdis.gsfc.nasa.gov/linux/drivers/vortex.html
Partition check:
 sda: sda1 sda2 sda3 sda4 < sda5 sda6 sda7 sda8 >
 sdb: sdb1 < sdb5 sdb6 > sdb2 sdb3
 sdc: sdc1 sdc2 sdc3 < sdc5 sdc6 sdc7 >
 sdd:scsidisk I/O error: dev 08:30, sector 0, absolute sector 0
 unable to read partition table
VFS: Mounted root (ext2 filesystem) readonly.
Adding Swap: 64224k swap-space (priority -1)

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