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, [EMAIL PROTECTED]: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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
