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zilog oops with bad scsi

Subject: zilog oops with bad scsi
From: Damian Dimmich <>
Date: Tue, 9 May 2006 15:16:24 +0100
Original-recipient: rfc822;
User-agent: KMail/1.8.3

I have, what I think is a badly set-up scsi system.  I think there is an issue 
with the termination, the attached drives are wide-scsi and I think there is 
some issue with the termination.  

That isn't the interesting bit though.  When booting with a freshly compiled kernel, running headless with the output coming in on ttyS1, I can 
get the kernel to oops by pressing any key (sending a keypress down the 
serial line) while it is trying to figure out what is going on with the scsi 
subsystem.  With the external scsi it boots fine.  

Interestingly, this did not happen with the debian-rolled 2.4.27 kernel (as 
in, it would complain about the scis, but not crash when i pressed keys).

Thought this may be useful to someone. Please let me know if you need any 
further information.


Linux version (ddimmich@indigo) (gcc version 4.0.3 20051201 
PROMLIB: ARC firmware Version 1 Revision 10
CPU revision is: 00000460
FPU revision is: 00000500
MC: SGI memory controller Revision 3
MC: Probing memory configuration:
 bank0:  64M @ 10000000
 bank1:  32M @ 14000000
 bank2: 128M @ 08000000
Determined physical RAM map:
 memory: 0e000000 @ 08000000 (usable)
Built 1 zonelists
Kernel command line: root=/dev/sda1 console=ttyS0 auto
Primary instruction cache 16kB, physically tagged, direct mapped, linesize 16 
Primary data cache 16kB, direct mapped, linesize 16 bytes.
Unified secondary cache 1024kB direct mapped, linesize 128 bytes.
Synthesized TLB refill handler (21 instructions).
Synthesized TLB load handler fastpath (33 instructions).
Synthesized TLB store handler fastpath (33 instructions).
Synthesized TLB modify handler fastpath (32 instructions).
EISA: Probing bus...
EISA: Detected 0 card.
ISA support compiled in.
PID hash table entries: 2048 (order: 11, 32768 bytes)
Calibrating system timer... 100500 [201.0000 MHz CPU]
Using 100.500 MHz high precision timer.
Console: colour dummy device 80x25
Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
Memory: 222688k/229376k available (2385k kernel code, 6556k reserved, 518k 
Mount-cache hash table entries: 512
Checking for 'wait' instruction...  unavailable.
NET: Registered protocol family 16
EISA bus registered
SCSI subsystem initialized
VFS: Disk quotas dquot_6.5.1
Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
Initializing Cryptographic API
io scheduler noop registered
io scheduler anticipatory registered (default)
io scheduler deadline registered
io scheduler cfq registered
serio: i8042 AUX port at 0xbfbd9843,0xbfbd9847 irq 44
serio: i8042 KBD port at 0xbfbd9843,0xbfbd9847 irq 44
Serial: IP22 Zilog driver (1 chips).
ttyS0 at MMIO 0xc001a830 (irq = 45) is a IP22-Zilog
Console: ttyS0 (IP22-Zilog)
ttyS1 at MMIO 0xc001c838 (irq = 45) is a IP22-Zilog
eth0: SGI Seeq8003 08:00:69:08:43:b2
wd33c93-0: chip=WD33c93B/13 no_sync=0xff no_dma=0 debug_flags=0x00
           Version 1.26 - 22/Feb/2003, Compiled Apr 15 2006 at 10:15:46
wd33c93-1: chip=unknown/255 no_sync=0xff no_dma=0 debug_flags=0x00
           Version 1.26 - 22/Feb/2003, Compiled Apr 15 2006 at 10:15:46
--UNKNOWN INTERRUPT:80:01:00--<6>scsi0 : SGI WD93
 sending SDTR 0103013f0csync_xfer=2c<5>  Vendor: SEAGATE   Model: ST34501W     
  Type:   Direct-Access                      ANSI SCSI revision: 02
scsi1 : SGI WD93
scsi1: warning : SCSI command probably completed successfully         before 
Cpu 0
$ 0   : 00000000 1000cc01 01470000 00000000
$ 4   : 95e5dc00 bfbd9830 882a1ee0 1000cc00
$ 8   : 1000cc00 1000001f 00000000 89364000
$12   : 00000002 88310000 ffffffff 00000001
$16   : 00000004 95e5dc00 bfbd9830 0147ae13
$20   : 882a1ee0 88310000 00000038 887fe594
$24   : 00000000 00000000
$28   : 882a0000 882a1df8 00000001 8819b784
Hi    : 000000f7
Lo    : ae135c80
epc   : 8819b254 ip22zilog_receive_chars+0x38/0x3cc     Not tainted
ra    : 8819b784 ip22zilog_interrupt+0x19c/0x1a4
Status: 1000cc03    KERNEL EXL IE
Cause : 30000008
BadVA : 00000000
PrId  : 00000460
Modules linked in:
Process swapper (pid: 0, threadinfo=882a0000, task=882a2000)
Stack : 00200200 882a1e68 0000001a 01baa080 00000000 883142dc 00000004 
        bfbd9830 0147ae13 882a1ee0 88310000 00000038 887fe594 00000001 
        0000000a 88310000 00000001 88315dd0 95e58300 00000000 00000000 
        882a1ee0 0000002d 88810000 8804bd88 882a1e68 882a1e68 00000000 
        882d75e0 95e58300 0000002d fffffffb 88310000 882a1ee0 8804beb0 
Call Trace:
 [<8819b784>] ip22zilog_interrupt+0x19c/0x1a4
 [<8804bd88>] handle_IRQ_event+0x80/0xf8
 [<8804beb0>] __do_IRQ+0xb0/0x140
 [<8804bf24>] __do_IRQ+0x124/0x140
 [<882d9000>] kernel_entry+0x0/0x7c
 [<882d9000>] kernel_entry+0x0/0x7c
 [<880067cc>] do_IRQ+0x1c/0x34
 [<8802ee88>] do_softirq+0x90/0xbc
 [<88003620>] indyIRQ+0x120/0x180
 [<88003608>] indyIRQ+0x108/0x180
 [<882d9000>] kernel_entry+0x0/0x7c
 [<88006e6c>] cpu_idle+0x48/0x50

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