2.0.34 + aic7xxx = total failure...

[Nicolai Langfeldt]

Vincent Cojot <coyote at step.polymtl.ca> tastet:
> .. then starts an endless loop of messages like this one:
>
> (SCSI1:-1:-1:-1) Bad scbptr 16 during SELTO
> (SCSI1:-1:-1:-1) Referenced SCB 255 not valid during SELTO.
> 	SCSISEQ = 0x5a SEQADDR = 0x8 SSTAT0 = 0x10 SSTAT1 = 0x8a

I'm seeing this too.  But on a production server late yesterday
and I didn't have time to investigate further.  But messages like
that were certainly involved.  Dual Pentium Pro running SMP kernel.
It's dead stable under 2.0.33.

$ cat /proc/pci 
PCI devices found:
  Bus  0, device  14, function  0:
    SCSI storage controller: Adaptec AIC-7881U (rev 0).
      Medium devsel.  Fast back-to-back capable.  IRQ 11.  Master Capable.  Latency=32.  Min Gnt=8.Max Lat=8.
      I/O at 0x6100.
      Non-prefetchable 32 bit memory at 0xe4001000.
  Bus  0, device  12, function  0:
    Ethernet controller: DEC DC21140 (rev 32).
      Medium devsel.  Fast back-to-back capable.  IRQ 10.  Master Capable.  Latency=32.  Min Gnt=20.Max Lat=40.
      I/O at 0x6000.
      Non-prefetchable 32 bit memory at 0xe4000000.
  Bus  0, device  10, function  0:
    VGA compatible controller: S3 Inc. Trio32/Trio64 (rev 84).
      Medium devsel.  IRQ 11.  
      Non-prefetchable 32 bit memory at 0xe0000000.
  Bus  0, device   7, function  1:
    IDE interface: Intel 82371SB Natoma/Triton II PIIX3 (rev 0).
      Medium devsel.  Fast back-to-back capable.  Master Capable.  Latency=32.  
      I/O at 0x3000.
  Bus  0, device   7, function  0:
    ISA bridge: Intel 82371SB Natoma/Triton II PIIX3 (rev 1).
      Medium devsel.  Fast back-to-back capable.  Master Capable.  No bursts.  
  Bus  0, device   0, function  0:
    Host bridge: Intel 82441FX Natoma (rev 2).
      Medium devsel.  Fast back-to-back capable.  Master Capable.  Latency=32. 

$ cat /proc/scsi/scsi      
Attached devices: 
Host: scsi0 Channel: 00 Id: 00 Lun: 00
  Vendor: SEAGATE  Model: ST32155N         Rev: 0532
  Type:   Direct-Access                    ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 02 Lun: 00
  Vendor: SEAGATE  Model: ST32155N         Rev: 0532
  Type:   Direct-Access                    ANSI SCSI revision: 02
Host: scsi0 Channel: 00 Id: 03 Lun: 00
  Vendor: NEC      Model: CD-ROM DRIVE:462 Rev: 1.13
  Type:   CD-ROM                           ANSI SCSI revision: 02


$ cat /proc/scsi/aic7xxx/0 
Adaptec AIC7xxx driver version: 4.1.1/3.2.1
Compile Options:
  AIC7XXX_RESET_DELAY    : 15
  AIC7XXX_TAGGED_QUEUEING: Disabled
  AIC7XXX_PAGE_ENABLE    : Disabled
  AIC7XXX_PROC_STATS     : Enabled

Adapter Configuration:
           SCSI Adapter: Adaptec AHA-294X Ultra SCSI host adapter
                         (AIC-788x chipset)
               Host Bus: Wide
                Base IO: 0x6100
         Base IO Memory: 0xe4001000
                    IRQ: 11
                   SCBs: Used 4, HW 16, Page 16
             Interrupts: 133450
          Serial EEPROM: True
   Extended Translation: Enabled
         SCSI Bus Reset: Enabled
             Ultra SCSI: Enabled
Disconnect Enable Flags: 0xffff

Statistics:
CHAN#A (TGT 0 LUN 0):
nxfers 55913 (10312 read;45601 written)
blks(512) rd=44468; blks(512) wr=113180
        < 512 512-1K   1-2K   2-4K   4-8K  8-16K 16-32K 32-64K 64-128K >128K
 Reads:     1      0   8293    386    837    721     24     34     16      0 
Writes:     0      0  38202   6680    668     37     12      1      1      0 

CHAN#A (TGT 2 LUN 0):
nxfers 77530 (57605 read;19925 written)
blks(512) rd=491536; blks(512) wr=52406
        < 512 512-1K   1-2K   2-4K   4-8K  8-16K 16-32K 32-64K 64-128K >128K
 Reads:     1      0  30383   4870   9308  11206   1075    564    198      0 
Writes:     0      0  17000   2403    379    111     25      4      3      0 



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