From owner-freebsd-scsi  Sat Oct  4 18:21:03 1997
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Date: Sat, 04 Oct 1997 18:20:56 -0700
To: gibbs@plutotech.com (Justin T. Gibbs)
From: Kachun Lee <kachun@zippo.com>
Subject: AHC error messages with 2.2.5-BETA
Cc: freebsd-scsi@freebsd.org
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I has a P6 200mhz system running 2.2-releng to the latest 2.2.5-BETA that
had 2 2740 controllers. I replaced 1 of 2740 with a 3740 when I added an
extra drive to it and splitted 12 drives into 3 channels. The system has
been generating the following errors about twice a day with different
drives/ahc channel...

Oct  4 16:16:39 clark /kernel: ahc1: WARNING no command for scb 99 (cmdcmplt)
Oct  4 16:16:39 clark /kernel: QOUTCNT == 1
Oct  4 16:16:49 clark /kernel: sd9(ahc1:11:0): SCB 0x5 - timed out while
idle, L
ASTPHASE == 0x1, SCSISIGI == 0xe6
Oct  4 16:16:49 clark /kernel: SEQADDR = 0x6 SCSISEQ = 0x12 SSTAT0 = 0x27
SSTAT1
 = 0xb
Oct  4 16:16:49 clark /kernel: Ordered Tag queued
Oct  4 16:16:49 clark /kernel: Ordered Tag sent
Oct  4 16:16:55 clark /kernel: sd9(ahc1:11:0): SCB 0x5 - timed out while
idle, L
ASTPHASE == 0x1, SCSISIGI == 0x0
Oct  4 16:16:55 clark /kernel: SEQADDR = 0x7 SCSISEQ = 0x12 SSTAT0 = 0x5
SSTAT1 
= 0xa
Oct  4 16:16:55 clark /kernel: sd9(ahc1:11:0): Queueing an Abort SCB
Oct  4 16:16:55 clark /kernel: sd9(ahc1:11:0): Abort Message Sent
Oct  4 16:16:55 clark /kernel: sd9(ahc1:11:0): SCB 5 - Abort Tag Completed.
Oct  4 16:16:55 clark /kernel: sd9(ahc1:11:0): no longer in timeout

Beside pause the system for a minute or so, the system kept running. Should
I ignore the errors or something I could do?

Best regards

PS: I has the following options enabled:

options AHC_TAGENABLE                   
options AHC_SCBPAGING_ENABLE            
options AHC_ALLOW_MEMIO