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前提背景：
生产环境上，服务器网络突然断链，ssh连接失败。
问题初步定位：
查找内核日志，得到网卡异常信息
Jan 24 11:52:43 localhost kernel: ixgbe 0000:84:00.0: eth0: RXDCTL.ENABLE on Rx queue 14 not cleared within the polling period
Jan 24 11:52:43 localhost kernel: ixgbe 0000:84:00.0: eth0: RXDCTL.ENABLE on Rx queue 15 not cleared within the polling period
Jan 24 11:52:43 localhost kernel: bonding: bond5: link status definitely down for interface eth0, disabling it
Jan 24 11:52:43 localhost kernel: ixgbe 0000:84:00.0: eth0: detected SFP+: 5
Jan 24 11:52:43 localhost kernel: ixgbe 0000:84:00.0: eth0: NIC Link is Up 10 Gbps, Flow Control: RX/TX
Jan 24 11:52:43 localhost kernel: bond5: link status definitely up for interface eth0, 10000 Mbps full duplex.
Jan 24 11:52:47 localhost kernel: ixgbe 0000:84:00.0: eth0: Detected Tx Unit Hang
Jan 24 11:52:47 localhost kernel: ixgbe 0000:84:00.0: eth0: tx_buffer_info[next_to_clean]
Jan 24 11:52:47 localhost kernel: ixgbe 0000:84:00.0: eth0: tx hang 448 detected on queue 6, resetting adapter
Jan 24 11:52:47 localhost kernel: ixgbe 0000:84:00.0: eth0: Reset adapter
Jan 24 11:52:47 localhost kernel: ixgbe 0000:84:00.0: eth0: RXDCTL.ENABLE on Rx queue 0 not cleared within the polling period
Jan 24 11:52:47 localhost kernel: ixgbe 0000:84:00.0: eth0: RXDCTL.ENABLE on Rx queue 1 not cleared within the polling period
Jan 24 11:52:47 localhost kernel: ixgbe 0000:84:00.0: eth0: RXDCTL.ENABLE on Rx queue 2 not cleared within the polling period
Jan 24 11:52:47 localhost kernel: ixgbe 0000:84:00.0: eth0: RXDCTL.ENABLE on Rx queue 3 not cleared within the polling period
网卡PCI信息：
# lspci -vvv -s 84:00.0
84:00.0 Ethernet controller: Intel Corporation 82599EB 10-Gigabit SFI/SFP+ Network Connection (rev 01)
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-
Interrupt: pin A routed to IRQ 16
Region 0: Memory at f7e20000 (64-bit, non-prefetchable) [disabled] [size=128K]
Region 2: I/O ports at f020 [disabled] [size=32]
Region 4: Memory at f7e44000 (64-bit, non-prefetchable) [disabled] [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
Masking: 00000000 Pending: 00000000
Capabilities: [70] MSI-X: Enable- Count=64 Masked-
&nbs
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