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Date:	Sun, 04 Mar 2007 23:03:25 +0000
From:	Nix <nix@...eri.org.uk>
To:	Corey Hickey <bugfood-ml@...ooh.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: CONFIG_PREEMPT -> crash under load in 2.6.20?

On 4 Mar 2007, Corey Hickey told this:
> Nix wrote:
>> I can't tell if magic sysrq dies, because as far as I know there's no
>> way to get magic sysrq to do much visible when you're in X, and I can't
>> get anything to go over the network kernel syslog because the network is
>> dead.
>
> You should still be able to use SysRQ even in X. I tested right now.
> 1. Have X running already and then start X in another VT
>    $ X :2 vt10
> 2. Hit Alt+SysRQ+K
>    ---> X dies, display gets corrupted, and keyboard input ignored
> 3. ssh in from another machine and switch back to the running X instance
>    # chvt 7

The network's dead; that's impossible.

However, I'll try SAK followed by a reg-and-flags dump: I'd entirely
forgotten about SAK. If that doesn't work I'll try to get a kexec dump.
(This is all moot if, as seems likely, the system's too dead to respond
to the keyboard: we shall see.)

>> I could begin a (really laborious, ~1 day per iteration) bisection to
>> try to track this down, but before I start, has anyone seen this before? 
>> Is its cause known?
>
> I've been seeing the same behavior under different circumstances; I
> don't know if it's related.
>
> http://www.uwsg.iu.edu/hypermail/linux/kernel/0703.0/1147.html

That's using _VOLUNTARY, so I sort of doubt that it's the *same*
problem, but I suppose it might be related. (But this is hypothesis in
the absence of data :) )

> For me, though, CONFIG_PREEMPT doesn't seem to have an effect. One thing
> I had noticed, however, is that with the problem I'm experiencing,
> changing some config options inexplicably delayed the onset of the
> lockup, but the lockup occurred nonetheless. Have you been running with
> CONFIG_PREEMPT_VOLUNTARY for a while now and not seen any problems at all?

 22:58:47 up 10 days, 22:20, 37 users,  load average: 12.71, 11.14, 18.22

No problems, and I've been loading the system really rather hard today
(as that line makes clear). I think the problem I'm seeing really *is*
tied to _PREEMPT.

> It might be helpful if you reported your hardware information; I'd be
> interested in seeing if there's much in common with my own machine.

Athlon 4 (UP), 768Mb RAM. No ACPI (to rule out a large nasty spot as
soon as possible). Random info starting with loaded modules:

loop 11080 0 - Live 0xf0a56000
radeon 107808 2 - Live 0xf0a5c000
drm 62356 3 radeon, Live 0xf0a2f000

processor	: 0
vendor_id	: AuthenticAMD
cpu family	: 6
model		: 6
model name	: AMD Athlon(tm) Processor
stepping	: 2
cpu MHz		: 1250.178
cache size	: 256 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 pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow ts
bogomips	: 2501.59
clflush size	: 32

           CPU0       
  0:  944756984   IO-APIC-edge      timer
  1:    1397516   IO-APIC-edge      i8042
  2:          0    XT-PIC-XT        cascade
  6:          5   IO-APIC-edge      floppy
  7:          0   IO-APIC-edge      parport0
  8:          1   IO-APIC-edge      rtc
 12:    2877936   IO-APIC-edge      i8042
 14:   20262275   IO-APIC-edge      ide2
 16:  330856361   IO-APIC-fasteoi   EMU10K1, radeon@pci:0000:01:00.0
 18:  115648745   IO-APIC-fasteoi   gordianet
 19:   11059053   IO-APIC-fasteoi   ide0, ide1
 21:          0   IO-APIC-fasteoi   uhci_hcd:usb1, uhci_hcd:usb2
NMI:          0 
LOC:  944792893 
ERR:          0
MIS:         49


0000-001f : dma1
0020-0021 : pic1
0040-0043 : timer0
0050-0053 : timer1
0060-006f : keyboard
0070-0077 : rtc
0080-008f : dma page reg
00a0-00a1 : pic2
00c0-00df : dma2
00f0-00ff : fpu
0170-0177 : 0000:00:11.1
01f0-01f7 : 0000:00:11.1
  01f0-01f7 : ide2
0295-0296 : w83627hf
0376-0376 : 0000:00:11.1
0378-037a : parport0
037b-037f : parport0
03c0-03df : vga+
03f2-03f5 : floppy
03f6-03f6 : 0000:00:11.1
  03f6-03f6 : ide2
03f7-03f7 : floppy DIR
03f8-03ff : serial
0400-0407 : vt596_smbus
0cf8-0cff : PCI conf1
b000-bfff : PCI Bus #01
  b800-b8ff : 0000:01:00.0
c800-c81f : 0000:00:11.2
  c800-c81f : uhci_hcd
cc00-cc1f : 0000:00:11.3
  cc00-cc1f : uhci_hcd
d000-d07f : 0000:00:07.0
d400-d41f : 0000:00:05.0
  d400-d41f : EMU10K1
d800-d80f : 0000:00:0c.0
  d800-d807 : ide0
  d808-d80f : ide1
dc00-dc03 : 0000:00:0c.0
  dc02-dc02 : ide1
e000-e007 : 0000:00:0c.0
  e000-e007 : ide1
e400-e403 : 0000:00:0c.0
  e402-e402 : ide0
e800-e807 : 0000:00:0c.0
  e800-e807 : ide0
ec00-ec07 : 0000:00:05.1
  ec00-ec07 : emu10k1-gp
fc00-fc0f : 0000:00:11.1
  fc00-fc07 : ide2
  fc08-fc0f : ide3


Here's some lspci output:

00:00.0 Host bridge: VIA Technologies, Inc. VT8366/A/7 [Apollo KT266/A/333]
	Subsystem: VIA Technologies, Inc. Unknown device 0000
	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 e0000000 (32-bit, prefetchable) [size=128M]
	Capabilities: [a0] AGP version 2.0
		Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW+ AGP3- Rate=x1,x2,x4
		Command: RQ=1 ArqSz=0 Cal=0 SBA+ AGP+ GART64- 64bit- FW- Rate=x4
	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-

00:01.0 PCI bridge: VIA Technologies, Inc. VT8366/A/7 [Apollo KT266/A/333 AGP] (prog-if 00 [Normal decode])
	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
	Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
	I/O behind bridge: 0000b000-0000bfff
	Memory behind bridge: dfe00000-dfefffff
	Prefetchable memory behind bridge: bfc00000-dfcfffff
	Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
	BridgeCtl: Parity- SERR- NoISA+ VGA+ MAbort- >Reset- FastB2B-
	Capabilities: [80] 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-

00:05.0 Multimedia audio controller: Creative Labs SB Live! EMU10k1 (rev 04)
	Subsystem: Creative Labs CT4620 SBLive!
	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, 5000ns max)
	Interrupt: pin A routed to IRQ 16
	Region 0: I/O ports at d400 [size=32]
	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-

00:05.1 Input device controller: Creative Labs SB Live! Game Port (rev 01)
	Subsystem: Creative Labs Gameport Joystick
	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
	Region 0: I/O ports at ec00 [size=8]
	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-

00:07.0 Ethernet controller: 3Com Corporation 3c905B 100BaseTX [Cyclone] (rev 30)
	Subsystem: 3Com Corporation 3C905B Fast Etherlink XL 10/100
	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 (2500ns min, 2500ns max), Cache Line Size: 32 bytes
	Interrupt: pin A routed to IRQ 18
	Region 0: I/O ports at d000 [size=128]
	Region 1: Memory at dfff7f80 (32-bit, non-prefetchable) [size=128]
	Expansion ROM at dffc0000 [disabled] [size=128K]
	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-

00:0b.0 USB Controller: NEC Corporation USB (rev 41) (prog-if 10 [OHCI])
	Subsystem: NEC Corporation Hama USB 2.0 CardBus
	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 (250ns min, 10500ns max), Cache Line Size: 32 bytes
	Interrupt: pin A routed to IRQ 18
	Region 0: Memory at dfff5000 (32-bit, non-prefetchable) [size=4K]
	Capabilities: [40] 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-

00:0b.1 USB Controller: NEC Corporation USB (rev 41) (prog-if 10 [OHCI])
	Subsystem: NEC Corporation Hama USB 2.0 CardBus
	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 (250ns min, 10500ns max), Cache Line Size: 32 bytes
	Interrupt: pin B routed to IRQ 19
	Region 0: Memory at dfff6000 (32-bit, non-prefetchable) [size=4K]
	Capabilities: [40] 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-

00:0b.2 USB Controller: NEC Corporation USB 2.0 (rev 02) (prog-if 20 [EHCI])
	Subsystem: Micro-Star International Co., Ltd. Unknown device 3504
	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 (4000ns min, 8500ns max), Cache Line Size: 32 bytes
	Interrupt: pin C routed to IRQ 16
	Region 0: Memory at dfff7e00 (32-bit, non-prefetchable) [size=256]
	Capabilities: [40] 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-

00:0c.0 RAID bus controller: Promise Technology, Inc. PDC20276 (MBFastTrak133 Lite) (rev 01) (prog-if 85)
	Subsystem: Promise Technology, Inc. MBFastTrak133 Lite (tm) Controller (RAID mode)
	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: 32 (1000ns min, 4500ns max), Cache Line Size: 32 bytes
	Interrupt: pin A routed to IRQ 19
	Region 0: I/O ports at e800 [size=8]
	Region 1: I/O ports at e400 [size=4]
	Region 2: I/O ports at e000 [size=8]
	Region 3: I/O ports at dc00 [size=4]
	Region 4: I/O ports at d800 [size=16]
	Region 5: Memory at dfffc000 (32-bit, non-prefetchable) [size=16K]
	Capabilities: [60] 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-

00:11.0 ISA bridge: VIA Technologies, Inc. VT8233A ISA Bridge
	Subsystem: VIA Technologies, Inc. Unknown device 0000
	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: [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-

00:11.1 IDE interface: VIA Technologies, Inc. VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06) (prog-if 8a [Master SecP PriP])
	Subsystem: VIA Technologies, Inc. VT82C586/B/VT82C686/A/B/VT8233/A/C/VT8235 PIPC Bus Master IDE
	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
	Interrupt: pin A routed to IRQ 16
	Region 0: [virtual] Memory at 000001f0 (32-bit, non-prefetchable) [size=8]
	Region 1: [virtual] Memory at 000003f0 (type 3, non-prefetchable) [size=1]
	Region 2: [virtual] Memory at 00000170 (32-bit, non-prefetchable) [size=8]
	Region 3: [virtual] Memory at 00000370 (type 3, non-prefetchable) [size=1]
	Region 4: I/O ports at fc00 [size=16]
	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-

00:11.2 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 23) (prog-if 00 [UHCI])
	Subsystem: VIA Technologies, Inc. (Wrong ID) USB Controller
	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, Cache Line Size: 32 bytes
	Interrupt: pin D routed to IRQ 21
	Region 4: I/O ports at c800 [size=32]
	Capabilities: [80] 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-

00:11.3 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 23) (prog-if 00 [UHCI])
	Subsystem: VIA Technologies, Inc. (Wrong ID) USB Controller
	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, Cache Line Size: 32 bytes
	Interrupt: pin D routed to IRQ 21
	Region 4: I/O ports at cc00 [size=32]
	Capabilities: [80] 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-

01:00.0 VGA compatible controller: ATI Technologies Inc RV280 [Radeon 9200 PRO] (rev 01) (prog-if 00 [VGA])
	Subsystem: ATI Technologies Inc RV280 [Radeon 9200 PRO]
	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 (2000ns min), Cache Line Size: 32 bytes
	Interrupt: pin A routed to IRQ 16
	Region 0: Memory at d0000000 (32-bit, prefetchable) [size=128M]
	Region 1: I/O ports at b800 [size=256]
	Region 2: Memory at dfef0000 (32-bit, non-prefetchable) [size=64K]
	Expansion ROM at dfec0000 [disabled] [size=128K]
	Capabilities: [58] AGP version 2.0
		Status: RQ=80 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW+ AGP3- Rate=x1,x2,x4
		Command: RQ=32 ArqSz=0 Cal=0 SBA+ AGP+ GART64- 64bit- FW- Rate=x4
	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-

01:00.1 Display controller: ATI Technologies Inc RV280 [Radeon 9200 PRO] (Secondary) (rev 01)
	Subsystem: ATI Technologies Inc Unknown device 5961
	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 (2000ns min), Cache Line Size: 32 bytes
	Region 0: Memory at c8000000 (32-bit, prefetchable) [size=128M]
	Region 1: Memory at dfee0000 (32-bit, non-prefetchable) [size=64K]
	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-



-- 
`In the future, company names will be a 32-character hex string.'
  --- Bruce Schneier on the shortage of company names
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