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Groups > linux.kernel > #1436203 > unrolled thread

Re: kmem_cache_alloc fail with unable to handle paging request after pci hotplug remove.

Started byLukas Wunner <lukas@wunner.de>
First post2016-07-04 17:20 +0200
Last post2016-07-05 09:50 +0200
Articles 4 — 3 participants

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  Re: kmem_cache_alloc fail with unable to handle paging request after  pci hotplug remove. Lukas Wunner <lukas@wunner.de> - 2016-07-04 17:20 +0200
    Re: kmem_cache_alloc fail with unable to handle paging request after  pci hotplug remove. Mathias Nyman <mathias.nyman@linux.intel.com> - 2016-07-04 17:40 +0200
      Re: kmem_cache_alloc fail with unable to handle paging request after  pci hotplug remove. AceLan Kao <acelan@gmail.com> - 2016-07-05 05:10 +0200
        Re: kmem_cache_alloc fail with unable to handle paging request after  pci hotplug remove. Lukas Wunner <lukas@wunner.de> - 2016-07-05 09:50 +0200

#1436203 — Re: kmem_cache_alloc fail with unable to handle paging request after pci hotplug remove.

FromLukas Wunner <lukas@wunner.de>
Date2016-07-04 17:20 +0200
SubjectRe: kmem_cache_alloc fail with unable to handle paging request after pci hotplug remove.
Message-ID<rRdPc-7gk-27@gated-at.bofh.it>
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@linux.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?)

Best regards,

Lukas

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#1436269

FromMathias Nyman <mathias.nyman@linux.intel.com>
Date2016-07-04 17:40 +0200
Message-ID<rRe8y-7mI-17@gated-at.bofh.it>
In reply to#1436203
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@linux.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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#1436617

FromAceLan Kao <acelan@gmail.com>
Date2016-07-05 05:10 +0200
Message-ID<rRoUh-5HL-7@gated-at.bofh.it>
In reply to#1436269
Hi,

These are logs from my machine.

*** Before plug-in the USB key

u@u-XPS-13-9xxx:~$ sudo lspci -vvvv -s 00:1c.0
00:1c.0 PCI bridge: Intel Corporation Device 9d10 (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 A routed to IRQ 16
        Bus: primary=00, secondary=01, subordinate=39, sec-latency=0
        I/O behind bridge: 00002000-00002fff
        Memory behind bridge: c4000000-da0fffff
        Prefetchable memory behind bridge: 00000000a0000000-00000000c1ffffff
        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 128 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 #1, Speed 8GT/s, Width x2, ASPM L1, Exit
Latency L0s unlimited, L1 <16us
                        ClockPM- Surprise- LLActRep+ BwNot+ ASPMOptComp+
                LnkCtl: ASPM L1 Enabled; RCB 64 bytes Disabled- CommClk-
                        ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 2.5GT/s, Width x0, TrErr- Train-
SlotClk+ DLActive- BWMgmt- ABWMgmt-
                SltCap: AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd-
HotPlug+ Surprise+
                        Slot #4, 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-
                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: 8GT/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 Device 075b
        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: [220 v1] #19
        Kernel driver in use: pcieport
        Kernel modules: shpchp

*** Plug-in the USB key

u@u-XPS-13-9xxx:~$ lspci -t
-[0000:00]-+-00.0
           +-02.0
           +-04.0
           +-14.0
           +-14.2
           +-15.0
           +-15.1
           +-16.0
           +-17.0
           +-1c.0-[01-39]----00.0-[02-39]--+-00.0-[03]--
           |                               +-01.0-[04-38]--
           |                               \-02.0-[39]----00.0
           +-1c.4-[3a]----00.0
           +-1c.5-[3b]----00.0
           +-1f.0
           +-1f.2
           +-1f.3
           \-1f.4

u@u-XPS-13-9xxx:~$ lspci
00:00.0 Host bridge: Intel Corporation Device 5904 (rev 02)
00:02.0 VGA compatible controller: Intel Corporation Device 5916 (rev 02)
00:04.0 Signal processing controller: Intel Corporation Skylake
Processor Thermal Subsystem (rev 02)
00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0
xHCI Controller (rev 21)
00:14.2 Signal processing controller: Intel Corporation Sunrise
Point-LP Thermal subsystem (rev 21)
00:15.0 Signal processing controller: Intel Corporation Sunrise
Point-LP Serial IO I2C Controller (rev 21)
00:15.1 Signal processing controller: Intel Corporation Sunrise
Point-LP Serial IO I2C Controller (rev 21)
00:16.0 Communication controller: Intel Corporation Sunrise Point-LP
CSME HECI (rev 21)
00:17.0 SATA controller: Intel Corporation Sunrise Point-LP SATA
Controller [AHCI mode] (rev 21)
00:1c.0 PCI bridge: Intel Corporation Device 9d10 (rev f1)
00:1c.4 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express
Root Port (rev f1)
00:1c.5 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express
Root Port (rev f1)
00:1f.0 ISA bridge: Intel Corporation Device 9d58 (rev 21)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)
00:1f.3 Audio device: Intel Corporation Device 9d71 (rev 21)
00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)
01:00.0 PCI bridge: Intel Corporation Device 1576
02:00.0 PCI bridge: Intel Corporation Device 1576
02:01.0 PCI bridge: Intel Corporation Device 1576
02:02.0 PCI bridge: Intel Corporation Device 1576
39:00.0 USB controller: Intel Corporation Device 15b5
3a:00.0 Network controller: Qualcomm Atheros QCA6174 802.11ac Wireless
Network Adapter (rev 32)
3b:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd.
RTS525A PCI Express Card Reader (rev 01)

*** Remove the USB key

u@u-XPS-13-9xxx:~$ lspci -t
-[0000:00]-+-00.0
           +-02.0
           +-04.0
           +-14.0
           +-14.2
           +-15.0
           +-15.1
           +-16.0
           +-17.0
           +-1c.0-[01-39]--
           +-1c.4-[3a]----00.0
           +-1c.5-[3b]----00.0
           +-1f.0
           +-1f.2
           +-1f.3
           \-1f.4

u@u-XPS-13-9xxx:~$ lspci
00:00.0 Host bridge: Intel Corporation Device 5904 (rev 02)
00:02.0 VGA compatible controller: Intel Corporation Device 5916 (rev 02)
00:04.0 Signal processing controller: Intel Corporation Skylake
Processor Thermal Subsystem (rev 02)
00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0
xHCI Controller (rev 21)
00:14.2 Signal processing controller: Intel Corporation Sunrise
Point-LP Thermal subsystem (rev 21)
00:15.0 Signal processing controller: Intel Corporation Sunrise
Point-LP Serial IO I2C Controller (rev 21)
00:15.1 Signal processing controller: Intel Corporation Sunrise
Point-LP Serial IO I2C Controller (rev 21)
00:16.0 Communication controller: Intel Corporation Sunrise Point-LP
CSME HECI (rev 21)
00:17.0 SATA controller: Intel Corporation Sunrise Point-LP SATA
Controller [AHCI mode] (rev 21)
00:1c.0 PCI bridge: Intel Corporation Device 9d10 (rev f1)
00:1c.4 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express
Root Port (rev f1)
00:1c.5 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express
Root Port (rev f1)
00:1f.0 ISA bridge: Intel Corporation Device 9d58 (rev 21)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)
00:1f.3 Audio device: Intel Corporation Device 9d71 (rev 21)
00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)
3a:00.0 Network controller: Qualcomm Atheros QCA6174 802.11ac Wireless
Network Adapter (rev 32)
3b:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd.
RTS525A PCI Express Card Reader (rev 01)

u@u-XPS-13-9xxx:~$ sudo lspci -vvvv -s 00:1c.0
00:1c.0 PCI bridge: Intel Corporation Device 9d10 (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 A routed to IRQ 16
        Bus: primary=00, secondary=01, subordinate=39, sec-latency=0
        I/O behind bridge: 00002000-00002fff
        Memory behind bridge: c4000000-da0fffff
        Prefetchable memory behind bridge: 00000000a0000000-00000000c1ffffff
        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 128 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 #1, Speed 8GT/s, Width x2, ASPM 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 #4, 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: 8GT/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 Device 075b
        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: [220 v1] #19
        Kernel driver in use: pcieport
        Kernel modules: shpchp

2016-07-04 23:45 GMT+08:00 Mathias Nyman <mathias.nyman@linux.intel.com>:
> 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@linux.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



-- 
Chia-Lin Kao(AceLan)
http://blog.acelan.idv.tw/
E-Mail: acelan.kaoATcanonical.com (s/AT/@/)

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#1436826

FromLukas Wunner <lukas@wunner.de>
Date2016-07-05 09:50 +0200
Message-ID<rRthg-8dT-17@gated-at.bofh.it>
In reply to#1436617
On Tue, Jul 05, 2016 at 11:00:21AM +0800, AceLan Kao wrote:
> These are logs from my machine.
> 
> *** Before plug-in the USB key
> 
> u@u-XPS-13-9xxx:~$ sudo lspci -vvvv -s 00:1c.0
> 00:1c.0 PCI bridge: Intel Corporation Device 9d10 (rev f1) (prog-if 00
> [Normal decode])
[...]
>                 LnkSta: Speed 2.5GT/s, Width x0, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
>                 SltCap: AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd- HotPlug+ Surprise+

The link is down (DLActive-), but the root port is a hotplug port,
so apparently with Alpine Ridge the controller is powered down if
nothing is plugged in and this results in the controller being
"unplugged" from the root port.

This looks less fishy than I originally thought, it's just very
different from the power management of pre Alpine Ridge controllers
on Macs (which is the only thing I'm really familiar with), where
the root port is not a hotplug port and the controller does not
disappear from the system when powered down. (It's config space
just becomes inaccessible.)

Best regards,

Lukas

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