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Date: Mon, 4 Jul 2016 18:45:56 +0300 From: Mathias Nyman <mathias.nyman@...ux.intel.com> To: Lukas Wunner <lukas@...ner.de> Cc: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, Bjorn Helgaas <bhelgaas@...gle.com>, Andrew Morton <akpm@...ux-foundation.org>, Linux Memory Management List <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>, Linux PCI <linux-pci@...r.kernel.org>, ACPI Devel Maling List <linux-acpi@...r.kernel.org>, "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>, USB <linux-usb@...r.kernel.org>, acelan@...il.com Subject: Re: kmem_cache_alloc fail with unable to handle paging request after pci hotplug remove. On 04.07.2016 18:21, Lukas Wunner wrote: > On Mon, Jul 04, 2016 at 06:04:42PM +0300, Mathias Nyman wrote: >> On 04.07.2016 17:25, Rafael J. Wysocki wrote: >>> On Mon, Jul 4, 2016 at 4:26 PM, Mathias Nyman <mathias.nyman@...ux.intel.com> wrote: >>>> AceLan Kao can get his DELL XPS 13 laptop to hang by plugging/un-plugging >>>> a USB 3.1 key via thunderbolt port. >>>> >>>> Allocating memory fails after this, always pointing to NULL pointer or >>>> page request failing in get_freepointer() called by >>>> kmalloc/kmem_cache_alloc. >>>> >>>> Unplugging a usb type-c device from the thunderbolt port on Alpine Ridge >>>> based systems like this one will hotplug remove PCI bridges together >>>> with the USB xhci controller behind them. > > Yes, that matches with the lspci output you've posted, the whole > Thunderbolt controller is gone after unplug. Perhaps it's powered > down? What does "lspci -vvvv -s 00:1d.6" say? (Does the root port > still have a link to the Thunderbolt controller?) > "lspci -vvvv -s 00:1d.6" after unplug (on my working DELL XPS) 00:1d.6 PCI bridge: Intel Corporation Sunrise Point-H PCI Express Root Port #15 (rev f1) (prog-if 00 [Normal decode]) Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin C routed to IRQ 18 Bus: primary=00, secondary=06, subordinate=3e, sec-latency=0 I/O behind bridge: 00002000-00002fff Memory behind bridge: c4000000-da0fffff Prefetchable memory behind bridge: 0000000080000000-00000000a1ffffff Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ <SERR- <PERR- BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B- PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn- Capabilities: [40] Express (v2) Root Port (Slot+), MSI 00 DevCap: MaxPayload 256 bytes, PhantFunc 0 ExtTag- RBE+ DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported- RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop- MaxPayload 128 bytes, MaxReadReq 128 bytes DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend- LnkCap: Port #15, Speed 8GT/s, Width x2, ASPM L0s L1, Exit Latency L0s <1us, L1 <16us ClockPM- Surprise- LLActRep+ BwNot+ ASPMOptComp+ LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+ ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- LnkSta: Speed 2.5GT/s, Width x2, TrErr- Train- SlotClk+ DLActive- BWMgmt+ ABWMgmt- SltCap: AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd- HotPlug+ Surprise+ Slot #18, PowerLimit 25.000W; Interlock- NoCompl+ SltCtl: Enable: AttnBtn- PwrFlt- MRL- PresDet+ CmdCplt- HPIrq- LinkChg- Control: AttnInd Unknown, PwrInd Unknown, Power- Interlock- SltSta: Status: AttnBtn- PowerFlt- MRL- CmdCplt- PresDet- Interlock- Changed: MRL- PresDet- LinkState+ RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna- CRSVisible- RootCap: CRSVisible- RootSta: PME ReqID 0000, PMEStatus- PMEPending- DevCap2: Completion Timeout: Range ABC, TimeoutDis+, LTR+, OBFF Not Supported ARIFwd+ DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled ARIFwd- LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis- Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS- Compliance De-emphasis: -6dB LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete-, EqualizationPhase1- EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest- Capabilities: [80] MSI: Enable- Count=1/1 Maskable- 64bit- Address: 00000000 Data: 0000 Capabilities: [90] Subsystem: Dell Sunrise Point-H PCI Express Root Port Capabilities: [a0] 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: [100 v1] Advanced Error Reporting UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol- UEMsk: DLP- SDES- TLP- FCP- CmpltTO+ CmpltAbrt- UnxCmplt+ RxOF- MalfTLP- ECRC- UnsupReq- ACSViol- UESvrt: DLP+ SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol- CESta: RxErr+ BadTLP- BadDLLP- Rollover+ Timeout+ NonFatalErr+ CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+ AERCap: First Error Pointer: 00, GenCap- CGenEn- ChkCap- ChkEn- Capabilities: [140 v1] Access Control Services ACSCap: SrcValid+ TransBlk+ ReqRedir+ CmpltRedir+ UpstreamFwd- EgressCtrl- DirectTrans- ACSCtl: SrcValid- TransBlk- ReqRedir- CmpltRedir- UpstreamFwd- EgressCtrl- DirectTrans- Capabilities: [200 v1] L1 PM Substates L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ PortCommonModeRestoreTime=40us PortTPowerOnTime=10us Capabilities: [220 v1] #19 Kernel driver in use: pcieport Kernel modules: shpchp AceLan Kao, can you confirm your lspci output looks similar on the failing DELL XPS? -Mathias
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