Dear Linux folks,


I optimized the Linux kernel configuration on my ASRock E350M1, and it now
boots really fast.

Unfortunately, that seems to cause the network driver to hit some corner
case, so that the link is supposedly down, although it should be up. The
cable is plugged in the whole time.

```
[    2.990757] libphy: r8169: probed
[    2.992661] r8169 0000:03:00.0 eth0: RTL8168e/8111e, bc:5f:f4:c8:d3:98, XID 2c2, IRQ 28
[    2.992669] r8169 0000:03:00.0 eth0: jumbo features [frames: 9200 bytes, tx checksumming: ko]
[    3.294484] usb 5-2: new low-speed USB device number 2 using ohci-pci
[    3.458711] usb 5-2: New USB device found, idVendor=1241, idProduct=1122, bcdDevice= 1.00
[    3.458718] usb 5-2: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    3.485065] input: HID 1241:1122 as /devices/pci0000:00/0000:00:12.0/usb5/5-2/5-2:1.0/0003:1241:1122.0001/input/input14
[    3.485320] hid-generic 0003:1241:1122.0001: input,hidraw0: USB HID v1.00 Mouse [HID 1241:1122] on usb-0000:00:12.0-2/input0
[    3.967622] random: crng init done
[    3.967628] random: 7 urandom warning(s) missed due to ratelimiting
[    4.323449] r8169 0000:03:00.0 enp3s0: renamed from eth0
[    4.363774] RTL8211DN Gigabit Ethernet r8169-300:00: attached PHY driver [RTL8211DN Gigabit Ethernet] (mii_bus:phy_addr=r8169-300:00, irq=IGNORE)
[    4.576887] r8169 0000:03:00.0 enp3s0: Link is Down
[    4.577167] A link change request failed with some changes committed already. Interface enp3s0 may have been left with an inconsistent configuration, please check.
[   16.377520] r8169 0000:03:00.0 enp3s0: Link is Up - 100Mbps/Full - flow control rx/tx
[   16.377553] IPv6: ADDRCONF(NETDEV_CHANGE): enp3s0: link becomes ready
```

It happens with all Linux kernels I tried. Please find all Linux
messages attached.

Could you please tell me, how this can be debugged and solved?


Kind regards,

Paul