2.5.25: spurious 8259A interrupt: IRQ7

This is my first time trying to report a kernel problem, so I have no idea if I'm doing it the right way or not. I also don't understand the problem; maybe it's my own fault. Here it goes, though:

[1.] One line summary of the problem:

spurious 8259A interrupt: IRQ7. (during heavy disk reads)

[2.] Full description of the problem/report:

I was experimenting with kernel 2.5.25 with 2.4 IDE forward port and Toshiba ACPI extensions. I was running find and part way through I got this message on the console:
spurious 8259A interrupt: IRQ7.
It doesn't seem to be reproducible.

[3.] Keywords (i.e., modules, networking, kernel):

spurious, interrupt, IRQ7

[4.] Kernel version (from /proc/version):

Linux version 2.5.25 (root@zigoku) (gcc version 2.96 20000731 (Red Hat Linux 7.3 2.96-110)) #1 Tue Jul 30 01:31:34 PDT 2002

[5.] Output of Oops.. message (if applicable) with symbolic information
resolved (see Documentation/oops-tracing.txt)

No oops.

[6.] A small shell script or example program which triggers the
problem (if possible)

Haven't replicated it yet.

[7.] Environment
[7.1.] Software (add the output of the ver_linux script here)

Linux zigoku 2.5.25 #1 Tue Jul 30 01:31:34 PDT 2002 i586 unknown

Gnu C                  2.96
Gnu make               3.79.1
util-linux             2.11n
mount                  2.11n
modutils               2.4.14
e2fsprogs              1.27
reiserfsprogs          3.x.0j
pcmcia-cs              3.1.22
PPP                    2.4.1
isdn4k-utils           3.1pre1
Linux C Library        2.2.5
Dynamic linker (ldd)   2.2.5
Procps                 2.0.7
Net-tools              1.60
Console-tools          0.3.3
Sh-utils               2.0.11
Modules Loaded         vfat fat

[7.2.] Processor information (from /proc/cpuinfo):

processor : 0
vendor_id : GenuineTMx86
cpu family : 5
model : 4
model name : Transmeta(tm) Crusoe(tm) Processor TM5600
stepping : 3
cpu MHz : 597.628
cache size : 512 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr cx8 sep cmov mmx longrun lrti
bogomips : 1150.97

[7.3.] Module information (from /proc/modules):

vfat                   11360   2 (autoclean)
fat                    37688   0 (autoclean) [vfat]

[7.4.] Loaded driver and hardware information (/proc/ioports, /proc/iomem)

0000-001f : dma1
0020-003f : pic1
0040-005f : timer
0060-006f : keyboard
0080-008f : dma page reg
00a0-00bf : pic2
00c0-00df : dma2
00f0-00ff : fpu
01f0-01f7 : ide0
03c0-03df : vga+
03f6-03f6 : ide0
0cf8-0cff : PCI conf1
1000-10ff : Acer Laboratories Inc. [ALi] M5451 PCI South Bridge Audio
1000-10ff : ALI 5451
4000-40ff : PCI CardBus #01
4400-44ff : PCI CardBus #01
edb0-edbf : Acer Laboratories Inc. [ALi] M5229 IDE edc0-edff : Intel Corp. 82557 [Ethernet Pro 100]
edc0-edff : e100
ee00-ee3f : Acer Laboratories Inc. [ALi] M7101 PMU ef00-ef1f : Acer Laboratories Inc. [ALi] M7101 PMU

00000000-0009fbff : System RAM
0009fc00-0009ffff : reserved
000a0000-000bffff : Video RAM area
000c0000-000c7fff : Video ROM
000e0000-000effff : Extension ROM
000f0000-000fffff : System ROM
00100000-0ef5bfff : System RAM
00100000-002369cc : Kernel code
002369cd-0028d5bb : Kernel data
0ef5c000-0ef5ffff : reserved
0ef60000-0ef6ffff : ACPI Tables
0ef70000-0f06ffff : reserved
10000000-10000fff : Acer Laboratories Inc. [ALi] M5451 PCI South Bridge Audio
10001000-10001fff : Toshiba America Info Systems ToPIC95 PCI to Cardbus Bridge with ZV Support
10400000-107fffff : PCI CardBus #01
10800000-10bfffff : PCI CardBus #01
dfdfe000-dfdfefff : Acer Laboratories Inc. [ALi] M5237 USB dfe00000-dfefffff : Intel Corp. 82557 [Ethernet Pro 100]
dfe00000-dfefffff : e100
dffff000-dfffffff : Intel Corp. 82557 [Ethernet Pro 100]
dffff000-dfffffff : e100
e0000000-e7ffffff : S3 Inc. 86C270-294 Savage/IX-MV efd00000-efdfffff : Transmeta Corporation LongRun Northbridge ffe00000-ffffffff : reserved

[7.5.] PCI information ('lspci -vvv' as root)

00:00.0 Host bridge: Transmeta Corporation LongRun Northbridge (rev
01)
Subsystem: Transmeta Corporation: Unknown device 0295
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort+ >SERR- <PERR-

	Latency: 0
	Region 0: Memory at efd00000 (32-bit, non-prefetchable) [size=1M]

00:00.1 RAM memory: Transmeta Corporation SDRAM controller
Subsystem: Transmeta Corporation: Unknown device 0295
Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR-

00:00.2 RAM memory: Transmeta Corporation BIOS scratchpad
Subsystem: Transmeta Corporation: Unknown device 0295
Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
<TAbort- <MAbort- >SERR- <PERR-

00:04.0 VGA compatible controller: S3 Inc. 86C270-294 Savage/IX-MV (rev 13) (prog-if 00 [VGA])
Subsystem: Toshiba America Info Systems: Unknown device 0001
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-

	Latency: 248 (1000ns min, 63750ns max), cache line size 08
	Interrupt: pin A routed to IRQ 11
	Region 0: Memory at e0000000 (32-bit, non-prefetchable) [size=128M]
	Expansion ROM at 000c0000 [disabled] [size=64K]
	Capabilities: [dc] Power Management version 1
		Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA 

PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:06.0 Multimedia audio controller: Acer Laboratories Inc. [ALi] M5451 PCI AC-Link Controller Audio Device (rev 01)
Subsystem: Toshiba America Info Systems: Unknown device 0001
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR+ <PERR+

	Latency: 64 (500ns min, 6000ns max)
	Interrupt: pin A routed to IRQ 11
	Region 0: I/O ports at 1000 [size=256]
	Region 1: Memory at 10000000 (32-bit, non-prefetchable) [size=4K]
	Capabilities: [dc] Power Management version 2
		Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA 

PME(D0-,D1-,D2+,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:07.0 ISA bridge: Acer Laboratories Inc. [ALi] M1533 PCI to ISA Bridge [Aladdin IV]
Subsystem: Toshiba America Info Systems: Unknown device 0004
Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Capabilities: [a0] Power Management version 1
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:0e.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] (rev 08)
Subsystem: Toshiba America Info Systems: Unknown device 0003
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 64 (2000ns min, 14000ns max), cache line size 08
Interrupt: pin A routed to IRQ 10
Region 0: Memory at dffff000 (32-bit, non-prefetchable) [size=4K] Region 1: I/O ports at edc0 [size=64]
Region 2: Memory at dfe00000 (32-bit, non-prefetchable) [size=1M]
Capabilities: [dc] Power Management version 2
Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA
PME(D0+,D1+,D2+,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=2 PME-

00:10.0 IDE interface: Acer Laboratories Inc. [ALi] M5229 IDE (rev c3) (prog-if e0)
Subsystem: Toshiba America Info Systems: Unknown device 0004
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 64 (500ns min, 1000ns max)
Interrupt: pin A routed to IRQ 255
Region 4: I/O ports at edb0 [size=16]
Capabilities: [60] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

00:11.0 Bridge: Acer Laboratories Inc. [ALi] M7101 PMU
Subsystem: Toshiba America Info Systems: Unknown device 0001
Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-

00:12.0 CardBus bridge: Toshiba America Info Systems ToPIC95 PCI to Cardbus Bridge with ZV Support (rev 32)
Subsystem: Toshiba America Info Systems: Unknown device 0001
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=slow >TAbort-
<TAbort- <MAbort- >SERR- <PERR-

	Latency: 168
	Interrupt: pin A routed to IRQ 5
	Region 0: Memory at 10001000 (32-bit, non-prefetchable) [size=4K]
	Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
	Memory window 0: 10400000-107ff000 (prefetchable)
	Memory window 1: 10800000-10bff000
	I/O window 0: 00004000-000040ff
	I/O window 1: 00004400-000044ff
	BridgeCtl: Parity- SERR- ISA- VGA- MAbort- >Reset- 16bInt+ PostWrite+
	16-bit legacy interface ports at 0001

00:14.0 USB Controller: Acer Laboratories Inc. [ALi] USB 1.1 Controller (rev 03) (prog-if 10 [OHCI])
Subsystem: Toshiba America Info Systems: Unknown device 0004
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-
<TAbort- <MAbort- >SERR- <PERR-
Latency: 64 (20000ns max), cache line size 08
Interrupt: pin A routed to IRQ 7
Region 0: Memory at dfdfe000 (32-bit, non-prefetchable) [size=4K]
Capabilities: [60] Power Management version 2
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

[7.6.] SCSI information (from /proc/scsi/scsi)

No SCSI in this kernel. :-)

[7.7.] Other information that might be relevant to the problem
(please look in /proc and include all information that you think to be relevant):

This is my first time trying to answer to a kernel report problem :)

There were a discussion about this warning some time ago. As far as I remember, it's just a interrupt which is not registered by any peripheral.
this is not a kernel bug, just a buggy hardware.

Tab

OK -- I'll take that explanation. I mentioned it because it happened in the first half hour of using this kernel specifically, and I'd never seen it before.

Thanks,

Eric

"First they ignore you.  Then they laugh at you.
 Then they fight you.  And then you win."             -Gandhi

I only see this if I have IO-APIC turned on for a uniprocessor system.

FWIW, I don't have IO-APIC turned on (and didn't before either)

eric

"First they ignore you.  Then they laugh at you.
 Then they fight you.  And then you win."             -Gandhi