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Subjectkernel 4.18.5 Realtek 8111G network adapter stops responding under high system load

When using kernel 4.18.5 the Realtek 8111G network adapter stops
responding under high system load.

Dmesg is showing no errors.

Sometimes an ifconfig enp3s0 down followed by an ifconfig enp3s0 up is
enough for the network adapter to restart responding. Sometimes a reboot
is necessary.

When copying r8169.c from 4.17.14 to the 4.18.5 kernel, networking works
perfectly stable on 4.18.5 so the problem seems r8169.c related.

Here the output from lshw:

             description: PCI bridge
             product: 8 Series/C220 Series Chipset Family PCI Express
Root Port #3
             vendor: Intel Corporation
             physical id: 1c.2
             bus info: pci@0000:00:1c.2
             version: d5
             width: 32 bits
             clock: 33MHz
             capabilities: pci pciexpress msi pm normal_decode
bus_master cap_list
             configuration: driver=pcieport
             resources: irq:18 ioport:d000(size=4096)
memory:f7300000-f73fffff ioport:f2100000(size=1048576)
                description: Ethernet interface
                product: RTL8111/8168/8411 PCI Express Gigabit Ethernet
                vendor: Realtek Semiconductor Co., Ltd.
                physical id: 0
                bus info: pci@0000:03:00.0
                logical name: enp3s0
                version: 0c
                serial: <hidden>
                size: 1Gbit/s
                capacity: 1Gbit/s
                width: 64 bits
                clock: 33MHz
                capabilities: pm msi pciexpress msix vpd bus_master
cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt
1000bt-fd autonegotiation
                configuration: autonegotiation=on broadcast=yes
driver=r8169 driverversion=2.3LK-NAPI duplex=full
firmware=rtl8168g-2_0.0.1 02/06/13 latency=0 link=yes multicast=yes
port=MII speed=1Gbit/s
                resources: irq:18 ioport:d000(size=256)
memory:f7300000-f7300fff memory:f2100000-f2103fff

Thanks in advance for looking into this,

David Arendt

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