3.6.10: Intel: ixgbe 0000:01:00.0 eth4: Detected Tx Unit Hang

["Justin Piszcz" <jpiszcz@lucidpixels.com>]

Hello,

Kernel 3.6.10, first time I have seen this that I can remember (on 10GbE)
anyway, is this a known issue with 3.6.10?

When the link went down is when I rebooted/etc the remote host attached on
the other end.
I've not changed anything physically with the hardware and have been on
3.6.0-3.6.9 and noticed this when I moved to 3.6.10.

[10270.229200] ixgbe 0000:01:00.0 eth4: NIC Link is Down
[10276.124937] ixgbe 0000:01:00.0 eth4: NIC Link is Up 10 Gbps, Flow
Control: RX/TX
[24529.430997] ixgbe 0000:01:00.0 eth4: Detected Tx Unit Hang
[24529.430997]   Tx Queue             <10>
[24529.430997]   TDH, TDT             <4e>, <51>
[24529.430997]   next_to_use          <51>
[24529.430997]   next_to_clean        <4e>
[24529.430997] tx_buffer_info[next_to_clean]
[24529.430997]   time_stamp           <10172668f>
[24529.430997]   jiffies              <101726ea4>
[24529.431011] ixgbe 0000:01:00.0 eth4: tx hang 1 detected on queue 10,
resetting adapter
[24529.431028] ixgbe 0000:01:00.0 eth4: Reset adapter

Thoughts?

lspci -vvxx

01:00.0 Ethernet controller: Intel Corporation 82598EB 10-Gigabit AT2 Server
Adapter (rev 01)
  Subsystem: Intel Corporation 82598EB 10-Gigabit AT2 Server Adapter
  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, Cache Line Size: 64 bytes
  Interrupt: pin A routed to IRQ 26
  Region 0: Memory at fbe40000 (32-bit, non-prefetchable) [size=128K]
  Region 1: Memory at fbe00000 (32-bit, non-prefetchable) [size=256K]
  Region 2: I/O ports at e000 [size=32]
  Region 3: Memory at fbe60000 (32-bit, non-prefetchable) [size=16K]
  Capabilities: [40] 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=1 PME-
  Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit+
    Address: 0000000000000000  Data: 0000
  Capabilities: [60] MSI-X: Enable+ Count=18 Masked-
    Vector table: BAR=3 offset=00000000
    PBA: BAR=3 offset=00002000
  Capabilities: [a0] Express (v2) Endpoint, MSI 00
    DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s <512ns, L1 <64us
      ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
    DevCtl: Report errors: Correctable+ Non-Fatal+ Fatal+ Unsupported+
      RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop+
      MaxPayload 256 bytes, MaxReadReq 512 bytes
    DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend-
    LnkCap: Port #0, Speed 2.5GT/s, Width x8, ASPM L0s L1, Latency L0 <4us,
L1 <64us
      ClockPM- Surprise- LLActRep- BwNot-
    LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk+
      ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
    LnkSta: Speed 2.5GT/s, Width x8, TrErr- Train- SlotClk+ DLActive-
BWMgmt- ABWMgmt-
    DevCap2: Completion Timeout: Range ABCD, TimeoutDis+
    DevCtl2: Completion Timeout: 16ms to 55ms, TimeoutDis-
    LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-,
Selectable De-emphasis: -6dB
       Transmit Margin: Normal Operating Range, EnterModifiedCompliance-
ComplianceSOS-
       Compliance De-emphasis: -6dB
    LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete-,
EqualizationPhase1-
       EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-
  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] Device Serial Number XX-XX-XX-XX-XX-XX-XX-XX
(masked)
  Kernel driver in use: ixgbe
00: 86 80 0b 15 07 04 10 00 01 00 00 02 10 00 00 00
10: 00 00 e4 fb 00 00 e0 fb 01 e0 00 00 00 00 e6 fb
20: 00 00 00 00 00 00 00 00 00 00 00 00 86 80 2c a1
30: 00 00 00 00 40 00 00 00 00 00 00 00 0b 01 00 00

Justin.