1. Memory corruption tied to use of agpgart module with variant of
Intel i815
2. Loading the agpgart module causes memory corruption in presence of
an Intel i815 AGP Bridge (PCI ID 0x1131, specifically). Command
"memtest all" reports failures in writing to addresses throughout
entire memory space, filesystem opertions start to fail, albeit in
limited manner, memory intensive applications eventually generate
oopses lamenting NULL pointer exceptions, invalid pages, invalid EIP
in apparently unrelated sections of the kernel (VM, VFS, networking
layer, SMP, et cetera)
3. AGP, modules, kernel, memory, corruption, instability
4. Version currently under test:
Linux version 2.4.19-pre8-ac5 (root@anduril) (gcc version 2.95.4 20010810 (Debian prerelease)) #1 Tue May 21 11:24:29 CEST 2002
5. N/A. Oopses were seen in non-exactly-repeatable conditions
(although memory intensive tasks increased frequency)
6. Not really applicable, however...
modprobe agpgart
7. Machine under test: ASUS L8400L
7.1
Linux palantir 2.4.19-pre8-ac5 #1 Tue May 21 11:24:29 CEST 2002 i686 unknown
Gnu C 2.95.4
Gnu make 3.79.1
util-linux 2.11h
mount 2.10q
modutils 2.4.11
e2fsprogs 1.27
reiserprogs 3.x.0j
PPP 2.4.0
Linux C Library 2.2.5
Dynamic linker (ldd) 2.2.5
Procps 2.0.6
Net-tools 1.54
Console-tools 0.2.3
Sh-utils 2.0
Modules Loaded agpgart pcmcia_core lp irnet ppp_generic slhc irlan irtty irport i2c-philips-par parport i2c-velleman i2c-proc i2c-dev i2c-algo-pcf i2c-algo-bit i2c-core ircomm-tty ircomm irda ospm_processor ospm_button ospm_battery ospm_ac_adapter ospm_system ospm_busmgr 8139too mii rtc
7.2
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 11
model name : Intel(R) Pentium(R) III CPU 1133MHz
stepping : 1
cpu MHz : 1135.944
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 mmx fxsr sse
bogomips : 2267.54
7.3
agpgart 29632 0 (unused)
pcmcia_core 35392 0
lp 6976 0 (autoclean) (unused)
irnet 27360 0 (unused)
ppp_generic 19820 0 [irnet]
slhc 4368 0 [ppp_generic]
irlan 18560 0 (unused)
irtty 5472 0 (unused)
irport 4664 0 (unused)
i2c-philips-par 1928 0 (unused)
parport 22944 0 [lp i2c-philips-par]
i2c-velleman 1408 0 (unused)
i2c-proc 6240 0 (unused)
i2c-dev 3840 0 (unused)
i2c-algo-pcf 4864 0 (unused)
i2c-algo-bit 7084 1 [i2c-philips-par i2c-velleman]
i2c-core 12800 0 [i2c-proc i2c-dev i2c-algo-pcf i2c-algo-bit]
ircomm-tty 18880 0 (unused)
irlan 18560 0 (unused)
irtty 5472 0 (unused)
irport 4664 0 (unused)
i2c-philips-par 1928 0 (unused)
parport 22944 0 [lp i2c-philips-par]
i2c-velleman 1408 0 (unused)
i2c-proc 6240 0 (unused)
i2c-dev 3840 0 (unused)
i2c-algo-pcf 4864 0 (unused)
i2c-algo-bit 7084 1 [i2c-philips-par i2c-velleman]
i2c-core 12800 0 [i2c-proc i2c-dev i2c-algo-pcf i2c-algo-bit]
ircomm-tty 18880 0 (unused)
ircomm 7068 0 [ircomm-tty]
irda 80396 0 [irnet irlan irtty irport ircomm-tty ircomm]
ospm_processor 5464 0 (unused)
ospm_button 3136 0 (unused)
ospm_battery 5540 0 (unused)
ospm_ac_adapter 2004 0 (unused)
ospm_system 5836 0 (unused)
ospm_busmgr 11392 0 [ospm_processor ospm_button ospm_battery ospm_ac_adapter ospm_system]
8139too 14816 1
mii 1088 0 [8139too]
rtc 5916 0 (autoclean)
7.4
0000-001f : dma1
0020-003f : pic1
0040-005f : timer
0060-006f : keyboard
0070-007f : rtc
0080-008f : dma page reg
00a0-00bf : pic2
00c0-00df : dma2
00f0-00ff : fpu
01f0-01f7 : ide0
0290-0297 : PnPBIOS PNP0c02
02f8-02ff : serial(set)
0378-037f : i2c (Vellemann adapter)
03c0-03df : vga+
03f0-03f1 : PnPBIOS PNP0c02
03f6-03f6 : ide0
03f8-03ff : serial(set)
0cf8-0cff : PCI conf1
a400-a41f : Intel Corp. 82801BA/BAM USB (Hub #1)
a400-a41f : usb-uhci
a800-a80f : Intel Corp. 82801BA IDE U100
a800-a807 : ide0
a808-a80f : ide1
b000-bfff : PCI Bus #02
b000-b0ff : Realtek Semiconductor Co., Ltd. RTL-8139/8139C
b000-b0ff : 8139too
b400-b4ff : ESS Technology ESS Modem
b800-b8ff : ESS Technology ES1988 Allegro-1
d000-dfff : PCI Bus #01
d800-d8ff : ATI Technologies Inc Radeon Mobility M6 LY
e400-e47f : PnPBIOS PNP0c02
ec00-ec3f : PnPBIOS PNP0c02
00000000-0009fbff : System RAM
0009fc00-0009ffff : reserved
000a0000-000bffff : Video RAM area
000c0000-000c7fff : Video ROM
000f0000-000fffff : System ROM
00100000-0ffebfff : System RAM
00100000-002c18ba : Kernel code
002c18bb-0036509f : Kernel data
0ffec000-0ffeefff : ACPI Tables
0ffef000-0fffefff : reserved
0ffff000-0fffffff : ACPI Non-volatile Storage
ee800000-eeffffff : PCI Bus #02
ee800000-ee8000ff : Realtek Semiconductor Co., Ltd. RTL-8139/8139C
ee800000-ee8000ff : 8139too
ee801000-ee801fff : Ricoh Co Ltd RL5c476 II
ee802000-ee802fff : Ricoh Co Ltd RL5c476 II (#2)
ef000000-efefffff : PCI Bus #01
ef000000-ef00ffff : ATI Technologies Inc Radeon Mobility M6 LY
eff00000-f7ffffff : PCI Bus #01
f0000000-f7ffffff : ATI Technologies Inc Radeon Mobility M6 LY
f8000000-fbffffff : Intel Corp. 82815 815 Chipset Host Bridge and Memory Controller Hub
fffc0000-ffffffff : reserved
7.5
00:00.0 Host bridge: Intel Corp. 82815 815 Chipset Host Bridge and Memory Controller Hub (rev 04)
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-
Latency: 0
Region 0: Memory at f8000000 (32-bit, prefetchable) [size=64M]
Capabilities: [88] #09 [e104]
Capabilities: [a0] AGP version 2.0
Status: RQ=31 SBA+ 64bit- FW- Rate=x1,x2
Command: RQ=0 SBA- AGP- 64bit- FW- Rate=<none>
00:01.0 PCI bridge: Intel Corp.: Unknown device 1131 (rev 04) (prog-if 00 [Normal decode])
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-
Latency: 0
Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
I/O behind bridge: 0000d000-0000dfff
Memory behind bridge: ef000000-efefffff
Prefetchable memory behind bridge: eff00000-f7ffffff
BridgeCtl: Parity- SERR- NoISA- VGA+ MAbort- >Reset- FastB2B-
00:1e.0 PCI bridge: Intel Corp. 82820 820 (Camino 2) Chipset PCI (rev 05) (prog-if 00 [Normal decode])
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-
Latency: 0
Bus: primary=00, secondary=02, subordinate=02, sec-latency=32
I/O behind bridge: 0000b000-0000bfff
Memory behind bridge: ee800000-eeffffff
Prefetchable memory behind bridge: eff00000-efefffff
BridgeCtl: Parity- SERR+ NoISA+ VGA- MAbort- >Reset- FastB2B-
00:1f.0 ISA bridge: Intel Corp. 82820 820 (Camino 2) Chipset ISA Bridge (ICH2) (rev 05)
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
00:1f.1 IDE interface: Intel Corp. 82820 820 (Camino 2) Chipset IDE U100 (rev 05) (prog-if 80 [Master])
Subsystem: Asustek Computer, Inc.: Unknown device 1567
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: [virtual] I/O ports at 01f0
Region 1: [virtual] I/O ports at 03f4
Region 2: [virtual] I/O ports at 0170
Region 3: [virtual] I/O ports at 0374
Region 4: I/O ports at a800 [size=16]
00:1f.2 USB Controller: Intel Corp. 82820 820 (Camino 2) Chipset USB (Hub A) (rev 05) (prog-if 00 [UHCI])
Subsystem: Asustek Computer, Inc.: Unknown device 1567
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
Interrupt: pin D routed to IRQ 9
Region 4: I/O ports at a400 [size=32]
01:00.0 VGA compatible controller: ATI Technologies Inc Radeon Mobility M6 LY (prog-if 00 [VGA])
Subsystem: Asustek Computer, Inc.: Unknown device 1491
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), cache line size 08
Interrupt: pin A routed to IRQ 11
Region 0: Memory at f0000000 (32-bit, prefetchable) [size=128M]
Region 1: I/O ports at d800 [size=256]
Region 2: Memory at ef000000 (32-bit, non-prefetchable) [size=64K]
Expansion ROM at effe0000 [disabled] [size=128K]
Capabilities: [58] AGP version 2.0
Status: RQ=47 SBA+ 64bit- FW- Rate=x1,x2
Command: RQ=0 SBA+ AGP- 64bit- FW- Rate=<none>
Capabilities: [50] 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-
02:01.0 Multimedia audio controller: ESS Technology ES1988 Allegro-1 (rev 12)
Subsystem: Asustek Computer, Inc.: Unknown device 1049
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: 32 (500ns min, 6000ns max)
Interrupt: pin A routed to IRQ 5
Region 0: I/O ports at b800 [size=256]
Capabilities: [c0] 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-
02:01.1 Communication controller: ESS Technology ESS Modem (rev 12)
Subsystem: Asustek Computer, Inc.: Unknown device 1049
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-
Interrupt: pin A routed to IRQ 5
Region 0: I/O ports at b400 [size=256]
Capabilities: [c0] Power Management version 2
Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=100mA PME(D0-,D1+,D2+,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
02:03.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139 (rev 10)
Subsystem: Asustek Computer, Inc.: Unknown device 1045
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: 32 (8000ns min, 16000ns max)
Interrupt: pin A routed to IRQ 9
Region 0: I/O ports at b000 [size=256]
Region 1: Memory at ee800000 (32-bit, non-prefetchable) [size=256]
Capabilities: [50] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA PME(D0-,D1+,D2+,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-
02:05.0 CardBus bridge: Ricoh Co Ltd RL5c476 II (rev 80)
Subsystem: Asustek Computer, Inc.: Unknown device 1564
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-
Interrupt: pin A routed to IRQ 11
Region 0: Memory at ee801000 (32-bit, non-prefetchable) [disabled] [size=4K]
Bus: primary=02, secondary=03, subordinate=06, sec-latency=0
Memory window 0: 00000000-00000000 [disabled] (prefetchable)
Memory window 1: 00000000-00000000 [disabled] (prefetchable)
I/O window 0: 00000000-00000003 [disabled]
I/O window 1: 00000000-00000003 [disabled]
BridgeCtl: Parity- SERR- ISA- VGA- MAbort- >Reset- 16bInt- PostWrite+
16-bit legacy interface ports at 0001
02:05.1 CardBus bridge: Ricoh Co Ltd RL5c476 II (rev 80)
Subsystem: Asustek Computer, Inc.: Unknown device 1564
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-
Interrupt: pin B routed to IRQ 11
Region 0: Memory at ee802000 (32-bit, non-prefetchable) [disabled] [size=4K]
Bus: primary=02, secondary=07, subordinate=0a, sec-latency=0
Memory window 0: 00000000-00000000 [disabled] (prefetchable)
Memory window 1: 00000000-00000000 [disabled] (prefetchable)
I/O window 0: 00000000-00000003 [disabled]
I/O window 1: 00000000-00000003 [disabled]
BridgeCtl: Parity- SERR- ISA- VGA- MAbort- >Reset- 16bInt- PostWrite+
16-bit legacy interface ports at 0001
7.6 N/A
7.7 None
8. Graphic card has 16MB of memory: Region 0 is reported to be 128M
(AFAIK, it could be correct).
ASUS has used the i815 chipset without the CGC, using a Radeon
Mobility M6 LY instead. All problems seem to stem from the agpgart
module: since at least 2.4.9 (after the VM change, IIRC) the kernel
has shown fundamental instability on this machine.
The problem has somewhat diminished during kernel evolution, from fast
death to slow death (i.e., with this kernel in particular, kernel
oopses are rare, compared to previous kernels, which were most
efficient in producing oopses).
Without agpgart module, kernel seems stable. A naive (totally naive,
I admit it) interpretation suggests a problem in setting the AGP aperture.
Good work to all,
Alessandro Morelli
AlphaC srl
P.S.: Feel free to contact me anytime
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