Public bug reported: I am trying to unbind a PCI device I received a kernel Oops.
I was following instructions described in this KVM document: http://www.linux-kvm.org/page/How_to_assign_devices_with_VT-d_in_KVM When I get to the unbind step: echo 0000:01:00.0 > /sys/bus/pci/devices/0000:01:00.0/driver/unbind I get a kernel Oops. Please note at this point I am not running the kvm guest, just trying to unbind the PCI device. I do have VT-d enabled in the bios and a processor that supports IOMMU. This problem is repeatable and appears to be isolated to the unbind command. Ubuntu 3.8.0-23.34-generic 3.8.11 01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GK106 [GeForce GTX 660] [10de:11c0] (rev a1) (prog-if 00 [VGA controller]) Subsystem: eVga.com. Corp. Device [3842:2660] Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Step ping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0, Cache Line Size: 64 bytes Interrupt: pin A routed to IRQ 16 Region 0: Memory at ea000000 (32-bit, non-prefetchable) [size=16M] Region 1: Memory at e0000000 (64-bit, prefetchable) [size=128M] Region 3: Memory at e8000000 (64-bit, prefetchable) [size=32M] Region 5: I/O ports at e000 [size=128] Expansion ROM at eb000000 [disabled] [size=512K] Capabilities: [60] Power Management version 3 Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot -,D3cold-) Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME- Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+ Address: 0000000000000000 Data: 0000 Capabilities: [78] Express (v2) Endpoint, MSI 00 DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s unlimited , L1 <64us ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset- DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupporte d- RlxdOrd- ExtTag+ PhantFunc- AuxPwr- NoSnoop+ MaxPayload 256 bytes, MaxReadReq 512 bytes DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPe nd- LnkCap: Port #0, Speed 8GT/s, Width x16, ASPM L0s L1, Latency L0 <512ns, L1 <4us ClockPM+ Surprise- LLActRep- BwNot- LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk+ ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- LnkSta: Speed 2.5GT/s, Width x16, TrErr- Train- SlotClk+ DLActiv e- BWMgmt- ABWMgmt- DevCap2: Completion Timeout: Range AB, TimeoutDis+ DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis- LnkCtl2: Target Link Speed: 8GT/s, EnterCompliance- SpeedDis-, S electable De-emphasis: -6dB Transmit Margin: Normal Operating Range, EnterModifiedC ompliance- ComplianceSOS- Compliance De-emphasis: -6dB LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete +, EqualizationPhase1+ EqualizationPhase2+, EqualizationPhase3+, LinkEqualizat ionRequest+ Capabilities: [b4] Vendor Specific Information: Len=14 <?> Capabilities: [100 v1] Virtual Channel Caps: LPEVC=0 RefClk=100ns PATEntryBits=1 Arb: Fixed- WRR32- WRR64- WRR128- Ctrl: ArbSelect=Fixed Status: InProgress- VC0: Caps: PATOffset=00 MaxTimeSlots=1 RejSnoopTrans- Arb: Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256- Ctrl: Enable+ ID=0 ArbSelect=Fixed TC/VC=ff Status: NegoPending- InProgress- Capabilities: [128 v1] Power Budgeting <?> Capabilities: [600 v1] Vendor Specific Information: ID=0001 Rev=1 Len=02 4 <?> Capabilities: [900 v1] #19 Kernel driver in use: nouveau ProblemType: Bug DistroRelease: Ubuntu 13.04 Package: linux-image-3.8.0-23-generic 3.8.0-23.34 ProcVersionSignature: Ubuntu 3.8.0-23.34-generic 3.8.11 Uname: Linux 3.8.0-23-generic x86_64 ApportVersion: 2.9.2-0ubuntu8.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC2: bruzer 2169 F.... pulseaudio /dev/snd/controlC1: bruzer 2169 F.... pulseaudio CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found. Date: Tue Jun 11 21:43:14 2013 HibernationDevice: RESUME=UUID=4b6b5242-2b8c-46e6-9d91-3168bcee1249 InstallationDate: Installed on 2013-06-07 (4 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424) IwConfig: eth0 no wireless extensions. lo no wireless extensions. virbr0 no wireless extensions. MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M. MarkForUpload: True ProcEnviron: TERM=xterm PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb 1 nouveaufb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-23-generic root=UUID=3ee858ac-5064-4c88-b187-2629fedf6f9c ro intel_iommu=on quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.8.0-23-generic N/A linux-backports-modules-3.8.0-23-generic N/A linux-firmware 1.106 RfKill: SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 05/03/2013 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: P1.20 dmi.board.name: Z87M Extreme4 dmi.board.vendor: ASRock dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: To Be Filled By O.E.M. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP1.20:bd05/03/2013:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnZ87MExtreme4:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.: dmi.product.name: To Be Filled By O.E.M. dmi.product.version: To Be Filled By O.E.M. dmi.sys.vendor: To Be Filled By O.E.M. ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug raring ** Attachment added: "lspci -vnvn output" https://bugs.launchpad.net/bugs/1190120/+attachment/3701261/+files/lspci-vnvn.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1190120 Title: Kernel Oops - unable to handle kernel NULL pointer dereference; after unbind of a PCI device To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1190120/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
