有线网络间隔断开,查看系统日志pcie端口存在错误打印
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| kernel: pcieport 0000:00:1c.0: AER: Multiple Corrected error received: 0000:00:1c.0
kernel: pcieport 0000:00:1c.0: AER: PCIe Bus Error: severity=Corrected, type=Data Link Layer, (Transmitter ID)
kernel: pcieport 0000:00:1c.0: AER: device [8086:a115] error status/mask=00001000/00002000
kernel: pcieport 0000:00:1c.0: AER: [12] Timeout
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错误信息
在错误信息中指出PCIE总线0000:00:1c.0的设备[8086:a115]存在错误
确定出错设备
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| $lspci -nn | grep "8086:a115"
00:1c.0 PCI bridge [0604]: Intel Corporation 100 Series/C230 Series Chipset Family PCI Express Root Port #6 [8086:a115] (rev f1)
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获取出错总线的具体信息
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| $lspci -s 00:1c.0 -v
00:1c.0 PCI bridge: Intel Corporation 100 Series/C230 Series Chipset Family PCI Express Root Port #6 (rev f1) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0, IRQ 121
Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
I/O behind bridge: 0000d000-0000dfff [size=4K]
Memory behind bridge: dfd00000-dfdfffff [size=1M]
Prefetchable memory behind bridge: 00000000d0000000-00000000d00fffff [size=1M]
Capabilities: <access denied>
Kernel driver in use: pcieport
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跟踪端口
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| $lspci -t
-[0000:00]-+-00.0
+-01.0-[01]--+-00.0
| \-00.1
+-14.0
+-16.0
+-17.0
+-1c.0-[02]----00.0
+-1f.0
+-1f.2
+-1f.3
\-1f.4
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pci的树状接口图，这里可以看到1c.0接到02设备
查找设备
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| =====>$lspci -nn | grep "02"
02:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 0c)
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出错设备应该是网卡,设备型号RTL8111/8168/8411
原因分析
其实类型的错误都可以分析为cpu寻址错误，
部分类型设备可以通过在grub.cfg里面给引导内核时添加参数pci=nocer, pci=nomsi之类解决，
实际上在正式运行的系统里面不应该有此错误，因为理论上驱动都是经测试正常的
那我们就只能得出一个结论，驱动不适合此设备
一般情况下得先确认设备驱动是否合适
查看网卡驱动
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| $sudo lshw -C network
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:02:00.0
logical name: enp2s0
version: 0c
serial: c8:5b:76:dc:a4:80
size: 1Gbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8168 driverversion=8.048.02-NAPI duplex=full ip=172.16.200.52 latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s
resources: irq:124 ioport:d000(size=256) memory:dfd00000-dfd00fff memory:d0000000-d0003fff
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网卡驱动为r8168,但是网卡设备是RTL8111/8168/8411,出现的错误应该是设备驱动不匹配造成的
更换网卡驱动
apt安装
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| sudo apt install r8168-dkms
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源码手动安装
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| wget https://codeload.github.com/mtorromeo/r8168/tar.gz/8.048.02
tar zxvf r8168-8.048.02.tar.gz && r8168-8.048.02
sudo ./autorun.sh
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更新完设备驱动后,网络连接正常,系统日志不再出现pcie错误打印
r8169驱动模块加入黑名单
在/etc/modprobe.d/下添加文件blacklist-r8169.conf内容：