>Number:         17900
>Category:       port-i386
>Synopsis:       panic/system hang with Adaptec aic7889 SCSI controller
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    port-i386-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Aug 09 12:52:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Pascal Renauld
>Release:        NetBSD 1.6_BETA5 - 200208080000
>Organization:
Network Storage Solutions
	
>Environment:
	
	
System: NetBSD johnbsd 1.6_BETA5 NetBSD 1.6_BETA5 (GENERIC) #0: Fri Aug 9 08:59:13 UTC 2002 autobuild@tgm.daemon.org:/autobuild/i386/OBJ/autobuild/src/sys/arch/i386/compile/GENERIC i386
Architecture: i386
Machine: i386
>Description:
See the messages in the system log below.
The Adaptec controller (aic7889) is on the motherboard and controls 2 hard drives.
Whenever there are IO accesses on both drives, the system either hangs or panics. 
It does not happen when only one drive is accessed.
This problem cannot be reproduced with Release 1.5.3 loaded on the same exact system.
See the system log below for more info in the case of a system hang.

Aug  9 07:56:01 johnbsd /netbsd: NetBSD 1.6_BETA5 (GENERIC) #0: Fri Aug  9 08:59:13 UTC 2002
Aug  9 07:56:01 johnbsd /netbsd:     autobuild@tgm.daemon.org:/autobuild/i386/OBJ/autobuild/src/sys/arch/i386/compile/GENERIC
Aug  9 07:56:01 johnbsd /netbsd: cpu0: Intel Pentium III (Coppermine) (686-class), 866.48 MHz
Aug  9 07:56:01 johnbsd /netbsd: cpu0: I-cache 16 KB 32b/line 4-way, D-cache 16 KB 32b/line 2-way
Aug  9 07:56:01 johnbsd /netbsd: cpu0: L2 cache 256 KB 32b/line 8-way
Aug  9 07:56:01 johnbsd /netbsd: cpu0: features 387fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR>
Aug  9 07:56:01 johnbsd /netbsd: cpu0: features 387fbff<PGE,MCA,CMOV,FGPAT,PSE36,PN,MMX>
Aug  9 07:56:01 johnbsd /netbsd: cpu0: features 387fbff<FXSR,SSE>
Aug  9 07:56:01 johnbsd /netbsd: cpu0: serial number 0000-068A-0001-A25C-EB68-D6D2
Aug  9 07:56:01 johnbsd /netbsd: total memory = 767 MB
Aug  9 07:56:01 johnbsd /netbsd: avail memory = 705 MB
Aug  9 07:56:01 johnbsd /netbsd: using 6144 buffers containing 39400 KB of memory
Aug  9 07:56:01 johnbsd /netbsd: BIOS32 rev. 0 found at 0xfd85e
Aug  9 07:56:01 johnbsd /netbsd: mainbus0 (root)
Aug  9 07:56:01 johnbsd /netbsd: pci0 at mainbus0 bus 0: configuration mode 1
Aug  9 07:56:01 johnbsd /netbsd: pci0: i/o space, memory space enabled, rd/line, rd/mult, wr/inv ok
Aug  9 07:56:02 johnbsd /netbsd: pchb0 at pci0 dev 0 function 0
Aug  9 07:56:02 johnbsd /netbsd: pchb0: ServerWorks CNB20LE Host (rev. 0x06)
Aug  9 07:56:02 johnbsd /netbsd: pchb1 at pci0 dev 0 function 1
Aug  9 07:56:02 johnbsd /netbsd: pchb1: ServerWorks CNB20LE Host (rev. 0x06)
Aug  9 07:56:02 johnbsd /netbsd: pci1 at pchb1 bus 1
Aug  9 07:56:02 johnbsd /netbsd: pci1: i/o space, memory space enabled, rd/line, rd/mult, wr/inv ok
Aug  9 07:56:02 johnbsd /netbsd: ahc1 at pci1 dev 4 function 0
Aug  9 07:56:02 johnbsd /netbsd: ahc1: interrupting at irq 9
Aug  9 07:56:02 johnbsd /netbsd: ahc1: aic7899 Wide Channel A, SCSI Id=7, 16/255 SCBs
Aug  9 07:56:02 johnbsd /netbsd: scsibus0 at ahc1: 16 targets, 8 luns per target
Aug  9 07:56:02 johnbsd /netbsd: ahc2 at pci1 dev 4 function 1
Aug  9 07:56:02 johnbsd /netbsd: ahc2: interrupting at irq 11
Aug  9 07:56:02 johnbsd /netbsd: ahc2: aic7899 Wide Channel B, SCSI Id=7, 16/255 SCBs
Aug  9 07:56:02 johnbsd /netbsd: scsibus1 at ahc2: 16 targets, 8 luns per target
Aug  9 07:56:02 johnbsd /netbsd: ti0 at pci1 dev 10 function 0: Alteon AceNIC 1000BASE-SX Ethernet (rev. 0x01)
Aug  9 07:56:02 johnbsd /netbsd: ti0: interrupting at irq 5
Aug  9 07:56:02 johnbsd /netbsd: ti0: Ethernet address: 00:60:cf:20:63:64
Aug  9 07:56:02 johnbsd /netbsd: vga1 at pci0 dev 2 function 0: ATI Technologies 3D Rage IIC (rev. 0x7a)
Aug  9 07:56:02 johnbsd /netbsd: wsdisplay0 at vga1 kbdmux 1: console (80x25, vt100 emulation)
Aug  9 07:56:02 johnbsd /netbsd: wsmux1: connecting to wsdisplay0
Aug  9 07:56:02 johnbsd /netbsd: fxp0 at pci0 dev 3 function 0: i82559 Ethernet, rev 8
Aug  9 07:56:02 johnbsd /netbsd: fxp0: interrupting at irq 10
Aug  9 07:56:02 johnbsd /netbsd: fxp0: Ethernet address 00:d0:b7:b7:89:50
Aug  9 07:56:02 johnbsd /netbsd: inphy0 at fxp0 phy 1: i82555 10/100 media interface, rev. 4
Aug  9 07:56:02 johnbsd /netbsd: inphy0: 10baseT, 10baseT-FDX, 100baseTX, 100baseTX-FDX, auto
Aug  9 07:56:02 johnbsd /netbsd: pcib0 at pci0 dev 15 function 0
Aug  9 07:56:02 johnbsd /netbsd: pcib0: ServerWorks OSB4 SouthBridge (rev. 0x50)
Aug  9 07:56:02 johnbsd /netbsd: pciide0 at pci0 dev 15 function 1: ServerWorks OSB4 IDE Controller (rev. 0x00)
Aug  9 07:56:02 johnbsd /netbsd: pciide0: bus-master DMA support present
Aug  9 07:56:02 johnbsd /netbsd: pciide0: primary channel configured to compatibility mode
Aug  9 07:56:02 johnbsd /netbsd: atapibus0 at pciide0 channel 0: 2 targets
Aug  9 07:56:02 johnbsd /netbsd: cd0 at atapibus0 drive 0: <MATSHITA CR-175, , 5DCJ> type 5 cdrom removable
Aug  9 07:56:02 johnbsd /netbsd: cd0: 32-bit data port
Aug  9 07:56:02 johnbsd /netbsd: cd0: drive supports PIO mode 4, DMA mode 2
Aug  9 07:56:02 johnbsd /netbsd: pciide0: primary channel interrupting at irq 14
Aug  9 07:56:02 johnbsd /netbsd: cd0(pciide0:0:0): using PIO mode 4, DMA mode 2 (using DMA data transfers)
Aug  9 07:56:02 johnbsd /netbsd: pciide0: secondary channel configured to native-PCI mode
Aug  9 07:56:02 johnbsd /netbsd: pciide0: couldn't map native-PCI interrupt
Aug  9 07:56:02 johnbsd /netbsd: isa0 at pcib0
Aug  9 07:56:02 johnbsd /netbsd: com0 at isa0 port 0x3f8-0x3ff irq 4: ns16550a, working fifo
Aug  9 07:56:02 johnbsd /netbsd: com1 at isa0 port 0x2f8-0x2ff irq 3: ns16550a, working fifo
Aug  9 07:56:02 johnbsd /netbsd: pckbc0 at isa0 port 0x60-0x64
Aug  9 07:56:02 johnbsd /netbsd: pckbd0 at pckbc0 (kbd slot)
Aug  9 07:56:02 johnbsd /netbsd: pckbc0: using irq 1 for kbd slot
Aug  9 07:56:02 johnbsd /netbsd: wskbd0 at pckbd0: console keyboard, using wsdisplay0
Aug  9 07:56:02 johnbsd /netbsd: pms0 at pckbc0 (aux slot)
Aug  9 07:56:02 johnbsd /netbsd: pckbc0: using irq 12 for aux slot
Aug  9 07:56:02 johnbsd /netbsd: wsmouse0 at pms0 mux 0
Aug  9 07:56:02 johnbsd /netbsd: wdc1 at isa0 port 0x170-0x177 irq 15
Aug  9 07:56:02 johnbsd /netbsd: lpt0 at isa0 port 0x378-0x37b irq 7
Aug  9 07:56:03 johnbsd /netbsd: pcppi0 at isa0 port 0x61
Aug  9 07:56:03 johnbsd /netbsd: midi0 at pcppi0: PC speaker
Aug  9 07:56:03 johnbsd /netbsd: sysbeep0 at pcppi0
Aug  9 07:56:03 johnbsd /netbsd: isapnp0 at isa0 port 0x279: ISA Plug 'n Play device support
Aug  9 07:56:03 johnbsd /netbsd: npx0 at isa0 port 0xf0-0xff: using exception 16
Aug  9 07:56:03 johnbsd /netbsd: fdc0 at isa0 port 0x3f0-0x3f7 irq 6 drq 2
Aug  9 07:56:03 johnbsd /netbsd: fd0 at fdc0 drive 0: 1.44MB, 80 cyl, 2 head, 18 sec
Aug  9 07:56:03 johnbsd /netbsd: isapnp0: no ISA Plug 'n Play devices found
Aug  9 07:56:03 johnbsd /netbsd: biomask eb45 netmask ef65 ttymask ffe7
Aug  9 07:56:03 johnbsd /netbsd: scsibus0: waiting 2 seconds for devices to settle...
Aug  9 07:56:03 johnbsd /netbsd: sd0 at scsibus0 target 0 lun 0: <QUANTUM, ATLAS10K3_36_SCA, 020K> SCSI3 0/direct fixed
Aug  9 07:56:03 johnbsd /netbsd: sd0: 35074 MB, 31022 cyl, 4 head, 578 sec, 512 bytes/sect x 71833096 sectors
Aug  9 07:56:03 johnbsd /netbsd: sd0: sync (25.0ns offset 127), 16-bit (80.000MB/s) transfers, tagged queueing
Aug  9 07:56:03 johnbsd /netbsd: sd1 at scsibus0 target 1 lun 0: <QUANTUM, ATLAS10K3_36_SCA, 020K> SCSI3 0/direct fixed
Aug  9 07:56:03 johnbsd /netbsd: sd1: 35074 MB, 31022 cyl, 4 head, 578 sec, 512 bytes/sect x 71833096 sectors
Aug  9 07:56:03 johnbsd /netbsd: sd1: sync (25.0ns offset 127), 16-bit (80.000MB/s) transfers, tagged queueing
Aug  9 07:56:03 johnbsd /netbsd: ses0 at scsibus0 target 6 lun 0: <ESG-SHV, SCA HSBP M14, 0.03> SCSI2 3/processor fixed
Aug  9 07:56:03 johnbsd /netbsd: ses0: SAF-TE Compliant Device
Aug  9 07:56:03 johnbsd /netbsd: ses0: async, 8-bit transfers
Aug  9 07:56:03 johnbsd /netbsd: scsibus1: waiting 2 seconds for devices to settle...
Aug  9 07:56:03 johnbsd /netbsd: Kernelized RAIDframe activated
Aug  9 07:56:03 johnbsd /netbsd: boot device: sd0
Aug  9 07:56:03 johnbsd /netbsd: root on sd0a dumps on sd0b
Aug  9 07:56:03 johnbsd /netbsd: root file system type: ffs
Aug  9 07:56:03 johnbsd /netbsd: wsdisplay0: screen 1 added (80x25, vt100 emulation)
Aug  9 07:56:03 johnbsd /netbsd: wsdisplay0: screen 2 added (80x25, vt100 emulation)
Aug  9 07:56:03 johnbsd /netbsd: wsdisplay0: screen 3 added (80x25, vt100 emulation)
Aug  9 07:56:03 johnbsd /netbsd: wsdisplay0: screen 4 added (80x25, vt100 emulation)
Aug  9 07:56:01 johnbsd savecore: no core dump
Aug  9 08:00:01 johnbsd syslogd: restart
Aug  9 08:00:11 johnbsd syslogd: restart
Aug  9 08:18:06 johnbsd /netbsd: ahc1: WARNING no command for scb 15 (cmdcmplt)
Aug  9 08:18:06 johnbsd /netbsd: QOUTPOS = 38
Aug  9 08:19:06 johnbsd /netbsd: sd1(ahc1:0:1:0): SCB f - timed out while idle, SEQADDR == 0xb
Aug  9 08:19:08 johnbsd /netbsd: SCSIRATE == 0x0
Aug  9 08:19:08 johnbsd /netbsd: sd1(ahc1:0:1:0): Queuing a BDR SCB
Aug  9 08:19:08 johnbsd /netbsd: sd1(ahc1:0:1:0):  Check Condition on CDB: 0x2a 00 02 1d d8 7f 00 00 10 00
Aug  9 08:19:08 johnbsd /netbsd:     SENSE KEY:  Aborted Command
Aug  9 08:19:08 johnbsd /netbsd:      ASC/ASCQ:  Overlapped Commands Attempted
Aug  9 08:19:08 johnbsd /netbsd: 
Aug  9 08:19:08 johnbsd /netbsd: sd1(ahc1:0:1:0): SCB f - timed out while idle, SEQADDR == 0x9
Aug  9 08:19:08 johnbsd /netbsd: SCSIRATE == 0x0
Aug  9 08:19:08 johnbsd /netbsd: sd1(ahc1:0:1:0): no longer in timeout, status = 0
Aug  9 08:19:08 johnbsd /netbsd: sd0: async, 8-bit transfers, tagged queueing
Aug  9 08:19:08 johnbsd /netbsd: sd1: async, 8-bit transfers, tagged queueing
Aug  9 08:19:08 johnbsd /netbsd: ahc1: Issued Channel A Bus Reset. 3 SCBs aborted
Aug  9 08:19:08 johnbsd /netbsd: sd0: sync (25.0ns offset 127), 16-bit (80.000MB/s) transfers, tagged queueing
Aug  9 08:19:08 johnbsd /netbsd: sd1: sync (25.0ns offset 127), 16-bit (80.000MB/s) transfers, tagged queueing
Aug  9 08:19:08 johnbsd /netbsd: ahc1: Interrupted for status of 0???
Aug  9 08:19:08 johnbsd /netbsd: ahc1: WARNING no command for scb 15 (cmdcmplt)
Aug  9 08:19:08 johnbsd /netbsd: QOUTPOS = 1
Aug  9 08:20:08 johnbsd /netbsd: sd1(ahc1:0:1:0): SCB f - timed out while idle, SEQADDR == 0xc
Aug  9 08:20:10 johnbsd /netbsd: SCSIRATE == 0x0
Aug  9 08:20:10 johnbsd /netbsd: sd1(ahc1:0:1:0): Queuing a BDR SCB
Aug  9 08:20:10 johnbsd /netbsd: ahc1: WARNING no command for scb 15 (cmdcmplt)
Aug  9 08:20:10 johnbsd /netbsd: QOUTPOS = 57
Aug  9 08:20:10 johnbsd /netbsd: sd1(ahc1:0:1:0): SCB f - timed out while idle, SEQADDR == 0xb
Aug  9 08:20:10 johnbsd /netbsd: SCSIRATE == 0x0
Aug  9 08:20:10 johnbsd /netbsd: sd1(ahc1:0:1:0): no longer in timeout, status = 0
Aug  9 08:20:10 johnbsd /netbsd: sd0: async, 8-bit transfers, tagged queueing
Aug  9 08:20:10 johnbsd /netbsd: sd1: async, 8-bit transfers, tagged queueing
Aug  9 08:20:10 johnbsd /netbsd: ahc1: Issued Channel A Bus Reset. 1 SCBs aborted
Aug  9 08:20:10 johnbsd /netbsd: sd0: sync (25.0ns offset 127), 16-bit (80.000MB/s) transfers, tagged queueing
Aug  9 08:21:59 johnbsd /netbsd: sd1: sync (25.0ns offset 127), 16-bit (80.000MB/s) transfers, tagged queueing
Aug  9 08:21:59 johnbsd /netbsd: ahc1:A:1: ahc_intr - referenced scb not valid during seqint 0x71 scb(15)
Aug  9 08:21:59 johnbsd /netbsd: ahc1: WARNING no command for scb 15 (cmdcmplt)
Aug  9 08:21:59 johnbsd /netbsd: QOUTPOS = 29
Aug  9 08:22:59 johnbsd /netbsd: sd0(ahc1:0:0:0): SCB f - timed out while idle, SEQADDR == 0x9
Aug  9 08:23:01 johnbsd /netbsd: SCSIRATE == 0x0
Aug  9 08:23:01 johnbsd /netbsd: sd0(ahc1:0:0:0): Queuing a BDR SCB
Aug  9 08:23:01 johnbsd /netbsd: ahc1: WARNING no command for scb 15 (cmdcmplt)
Aug  9 08:23:01 johnbsd /netbsd: QOUTPOS = 57
Aug  9 08:23:01 johnbsd /netbsd: sd0(ahc1:0:0:0): SCB f - timed out while idle, SEQADDR == 0x9
Aug  9 08:23:01 johnbsd /netbsd: SCSIRATE == 0x0
Aug  9 08:23:01 johnbsd /netbsd: sd0(ahc1:0:0:0): no longer in timeout, status = 0
Aug  9 08:23:01 johnbsd /netbsd: sd0: async, 8-bit transfers, tagged queueing
Aug  9 08:23:01 johnbsd /netbsd: sd1: async, 8-bit transfers, tagged queueing
Aug  9 08:23:01 johnbsd /netbsd: ahc1: Issued Channel A Bus Reset. 1 SCBs aborted
Aug  9 08:23:01 johnbsd /netbsd: sd0: sync (25.0ns offset 127), 16-bit (80.000MB/s) transfers, tagged queueing
Aug  9 08:23:01 johnbsd /netbsd: sd1: sync (25.0ns offset 127), 16-bit (80.000MB/s) transfers, tagged queueing
Aug  9 08:23:01 johnbsd /netbsd: ahc1:A:1: ahc_intr - referenced scb not valid during seqint 0x71 scb(15)
Aug  9 08:23:01 johnbsd /netbsd: ahc1: WARNING no command for scb 15 (cmdcmplt)
Aug  9 08:23:01 johnbsd /netbsd: QOUTPOS = 0
Aug  9 08:24:01 johnbsd /netbsd: sd0(ahc1:0:0:0): SCB f - timed out while idle, SEQADDR == 0xc
Aug  9 08:24:03 johnbsd /netbsd: SCSIRATE == 0x0
Aug  9 08:24:03 johnbsd /netbsd: sd0(ahc1:0:0:0): Queuing a BDR SCB
Aug  9 08:24:03 johnbsd /netbsd: ahc1: WARNING no command for scb 15 (cmdcmplt)
Aug  9 08:24:03 johnbsd /netbsd: QOUTPOS = 35
Aug  9 08:24:03 johnbsd /netbsd: sd0(ahc1:0:0:0): SCB f - timed out while idle, SEQADDR == 0xb
Aug  9 08:24:03 johnbsd /netbsd: SCSIRATE == 0x0
Aug  9 08:24:03 johnbsd /netbsd: sd0(ahc1:0:0:0): no longer in timeout, status = 0
Aug  9 08:24:03 johnbsd /netbsd: sd0: async, 8-bit transfers, tagged queueing
Aug  9 08:24:03 johnbsd /netbsd: sd1: async, 8-bit transfers, tagged queueing
Aug  9 08:24:03 johnbsd /netbsd: ahc1: Issued Channel A Bus Reset. 1 SCBs aborted
Aug  9 08:24:03 johnbsd /netbsd: sd0: sync (25.0ns offset 127), 16-bit (80.000MB/s) transfers, tagged queueing
Aug  9 08:24:03 johnbsd /netbsd: sd1: sync (25.0ns offset 127), 16-bit (80.000MB/s) transfers, tagged queueing
Aug  9 08:24:03 johnbsd /netbsd: ahc1:A:1: ahc_intr - referenced scb not valid during seqint 0x71 scb(15)
Aug  9 08:24:03 johnbsd /netbsd: ahc1: WARNING no command for scb 15 (cmdcmplt)
Aug  9 08:24:03 johnbsd /netbsd: QOUTPOS = 0
Aug  9 08:25:03 johnbsd /netbsd: sd0(ahc1:0:0:0): SCB f - timed out while idle, SEQADDR == 0xa
Aug  9 08:25:05 johnbsd /netbsd: SCSIRATE == 0x0
Aug  9 08:25:05 johnbsd /netbsd: sd0(ahc1:0:0:0): Queuing a BDR SCB
Aug  9 08:25:05 johnbsd /netbsd: ahc1: WARNING no command for scb 15 (cmdcmplt)
Aug  9 08:25:05 johnbsd /netbsd: QOUTPOS = 34
Aug  9 08:25:05 johnbsd /netbsd: sd0(ahc1:0:0:0): SCB f - timed out while idle, SEQADDR == 0x9
Aug  9 08:25:05 johnbsd /netbsd: SCSIRATE == 0x0
Aug  9 08:25:05 johnbsd /netbsd: sd0(ahc1:0:0:0): no longer in timeout, status = 0
Aug  9 08:25:05 johnbsd /netbsd: sd0: async, 8-bit transfers, tagged queueing
Aug  9 08:25:05 johnbsd /netbsd: sd1: async, 8-bit transfers, tagged queueing
Aug  9 08:25:05 johnbsd /netbsd: ahc1: Issued Channel A Bus Reset. 1 SCBs aborted
Aug  9 08:25:05 johnbsd /netbsd: sd0: sync (25.0ns offset 127), 16-bit (80.000MB/s) transfers, tagged queueing
Aug  9 08:25:05 johnbsd /netbsd: sd1: sync (25.0ns offset 127), 16-bit (80.000MB/s) transfers, tagged queueing
Aug  9 08:25:05 johnbsd /netbsd: ahc1:A:1: ahc_intr - referenced scb not valid during seqint 0x71 scb(15)
Aug  9 08:25:05 johnbsd /netbsd: ahc1: WARNING no command for scb 15 (cmdcmplt)
Aug  9 08:25:05 johnbsd /netbsd: QOUTPOS = 0
Aug  9 08:26:05 johnbsd /netbsd: sd0(ahc1:0:0:0): SCB f - timed out while idle, SEQADDR == 0xb
Aug  9 08:26:07 johnbsd /netbsd: SCSIRATE == 0x0
Aug  9 08:26:07 johnbsd /netbsd: sd0(ahc1:0:0:0): Queuing a BDR SCB
Aug  9 08:26:07 johnbsd /netbsd: ahc1: WARNING no command for scb 15 (cmdcmplt)
Aug  9 08:26:07 johnbsd /netbsd: QOUTPOS = 34
Aug  9 08:26:07 johnbsd /netbsd: sd0(ahc1:0:0:0): SCB f - timed out while idle, SEQADDR == 0xb
Aug  9 08:26:07 johnbsd /netbsd: SCSIRATE == 0x0
Aug  9 08:26:07 johnbsd /netbsd: sd0(ahc1:0:0:0): no longer in timeout, status = 0
Aug  9 08:26:07 johnbsd /netbsd: sd0: async, 8-bit transfers, tagged queueing
Aug  9 08:26:07 johnbsd /netbsd: sd1: async, 8-bit transfers, tagged queueing
Aug  9 08:26:07 johnbsd /netbsd: ahc1: Issued Channel A Bus Reset. 1 SCBs aborted
Aug  9 08:26:07 johnbsd /netbsd: sd0: sync (25.0ns offset 127), 16-bit (80.000MB/s) transfers, tagged queueing
Aug  9 08:26:07 johnbsd /netbsd: sd1: sync (25.0ns offset 127), 16-bit (80.000MB/s) transfers, tagged queueing
Aug  9 08:26:07 johnbsd /netbsd: ahc1:A:1: ahc_intr - referenced scb not valid during seqint 0x71 scb(15)
Aug  9 08:26:07 johnbsd /netbsd: ahc1: WARNING no command for scb 15 (cmdcmplt)
Aug  9 08:26:07 johnbsd /netbsd: QOUTPOS = 0
Aug  9 08:27:07 johnbsd /netbsd: sd0(ahc1:0:0:0): SCB f - timed out while idle, SEQADDR == 0xa
Aug  9 08:27:09 johnbsd /netbsd: SCSIRATE == 0x0
Aug  9 08:27:09 johnbsd /netbsd: sd0(ahc1:0:0:0): Queuing a BDR SCB
Aug  9 08:27:09 johnbsd /netbsd: ahc1: WARNING no command for scb 15 (cmdcmplt)
Aug  9 08:27:09 johnbsd /netbsd: QOUTPOS = 34
Aug  9 08:27:09 johnbsd /netbsd: sd0(ahc1:0:0:0): SCB f - timed out while idle, SEQADDR == 0x9
Aug  9 08:27:09 johnbsd /netbsd: SCSIRATE == 0x0
Aug  9 08:27:09 johnbsd /netbsd: sd0(ahc1:0:0:0): no longer in timeout, status = 0
Aug  9 08:27:09 johnbsd /netbsd: sd0: async, 8-bit transfers, tagged queueing
Aug  9 08:27:09 johnbsd /netbsd: sd1: async, 8-bit transfers, tagged queueing
Aug  9 08:27:09 johnbsd /netbsd: ahc1: Issued Channel A Bus Reset. 1 SCBs aborted
Aug  9 08:27:09 johnbsd /netbsd: sd0: sync (25.0ns offset 127), 16-bit (80.000MB/s) transfers, tagged queueing
Aug  9 09:57:35 johnbsd /netbsd: sd1: sync (25.0ns offset 127), 16-bit (80.000MB/s) transfers, tagged queueing
Aug  9 09:57:35 johnbsd /netbsd: ahc1:A:1: ahc_intr - referenced scb not valid during seqint 0x71 scb(15)
Aug  9 09:57:35 johnbsd /netbsd: ahc1: WARNING no command for scb 15 (cmdcmplt)
Aug  9 09:57:35 johnbsd /netbsd: QOUTPOS = 39


See the log below for a system panic:

sd1(ahc1:0:1:0) : Other SCB Timeout
kernel: page fault trap, code = 0
Stopped at ahc_timeout + 0x3b9 : movl 0x40(%edx),%eax
> trace 
 ahc_timeout at ahc_timeout+0x3b9
 softclock at softclock+0x161
 softintr_dispatch+0x99
 Xsoftclock+0x11
 ---interrupt---
 idle at idle+0x1b
 bpendtsleep
 uvm_schedule at uvm_scheduler+0x78
 main at main+0x6ea

	
>How-To-Repeat:
Several 'cp -r' from one disk to another will produce after a while a system hang.
I usually mount /dev/sd1g on /home and do several 'dd if=/dev/rsd0e of=/home/TESTFILExx bs=32k count=1000' and this will usually produce a panic in a few seconds.
	
>Fix:
	Problem is not present with Release 1.5.3
	
>Release-Note:
>Audit-Trail:
>Unformatted: