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    Subject[REGRESSION] 2.6.24-rc7: e1000: Detected Tx Unit Hang
    Date
    After compiling v2.6.24-rc7-163-g1a1b285 (x86_64) yesterday I suddenly see this error
    repeatedly:
    kernel: e1000: eth0: e1000_clean_tx_irq: Detected Tx Unit Hang
    kernel: Tx Queue <0>
    kernel: TDH <a>
    kernel: TDT <a>
    kernel: next_to_use <a>
    kernel: next_to_clean <ff>
    kernel: buffer_info[next_to_clean]
    kernel: time_stamp <10002738a>
    kernel: next_to_watch <ff>
    kernel: jiffies <1000275b4>
    kernel: next_to_watch.status <1>

    My previous kernel was v2.6.24-rc7 and with that this error did not occur. I
    have also never seen it with earlier kernels.

    The values for "TX Queue" and "next_to_watch.status" are constant, the
    others vary.

    My NIC is:
    01:00.0 Ethernet controller [0200]: Intel Corporation 82573E Gigabit Ethernet Controller (Copper) (rev 03)

    01:00.0 0200: 8086:108c (rev 03)
    Subsystem: 8086:3096
    Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
    Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
    Latency: 0, Cache Line Size: 64 bytes
    Interrupt: pin A routed to IRQ 1273
    Region 0: Memory at 90200000 (32-bit, non-prefetchable) [size=128K]
    Region 1: Memory at 90100000 (32-bit, non-prefetchable) [size=1M]
    Region 2: I/O ports at 1000 [size=32]
    Capabilities: [c8] Power Management version 2
    Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
    Status: D0 PME-Enable- DSel=0 DScale=1 PME-
    Capabilities: [d0] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable+
    Address: 00000000fee0300c Data: 41a9
    Capabilities: [e0] Express Endpoint IRQ 0
    Device: Supported: MaxPayload 256 bytes, PhantFunc 0, ExtTag-
    Device: Latency L0s <512ns, L1 <64us
    Device: AtnBtn- AtnInd- PwrInd-
    Device: Errors: Correctable- Non-Fatal- Fatal- Unsupported-
    Device: RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+
    Device: MaxPayload 128 bytes, MaxReadReq 512 bytes
    Link: Supported Speed 2.5Gb/s, Width x1, ASPM unknown, Port 0
    Link: Latency L0s <128ns, L1 <64us
    Link: ASPM Disabled RCB 64 bytes CommClk+ ExtSynch-
    Link: Speed 2.5Gb/s, Width x1

    The system is an Intel D945GCZ main board with
    Intel(R) Pentium(R) D CPU 3.20GHz (dual core) processor.

    Cheers,
    FJP


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