could this be related ?

https://www.spinics.net/lists/linux-rdma/msg57490.html

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https://bugs.launchpad.net/bugs/1736947

Title:
  Very long boot time with Chelsio T320 10GBASE-R RNIC adapter

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I have a Chelsio T320 10GBASE-R RNIC in my machine apparently
  triggering a very long boot time.

  I initially thought about a USB problem as I wrote in ticket #1704614
  but new tests showed me otherwise.

  booting with this parameters yield some interesting things:
  GRUB_CMDLINE_LINUX_DEFAULT="--verbose nosplash debug"

  
  [    4.772733] hid-generic 0003:046D:C22D.0009: input,hiddev0,hidraw8: USB 
HID v1.11 Device [Logitech G510 Gaming Keyboard] on 
usb-0000:00:1d.0-1.8.1.2.2/input1
  [    4.877277] usb 2-1.8.1.3.4: New USB device found, idVendor=046d, 
idProduct=c069
  [    4.877360] usb 2-1.8.1.3.4: New USB device strings: Mfr=1, Product=2, 
SerialNumber=0
  [    4.877440] usb 2-1.8.1.3.4: Product: USB Laser Mouse
  [    4.877504] usb 2-1.8.1.3.4: Manufacturer: Logitech
  [    4.883052] input: Logitech USB Laser Mouse as 
/devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.8/2-1.8.1/2-1.8.1.3/2-1.8.1.3.4/2-1.8.1.3.4:1.0/0003:046D:C069.000A/input/input12
  [    4.883391] hid-generic 0003:046D:C069.000A: input,hidraw9: USB HID v1.10 
Mouse [Logitech USB Laser Mouse] on usb-0000:00:1d.0-1.8.1.3.4/input0
  [   62.501496] systemd-udevd[110]: seq 1103 
'/devices/pci0000:00/0000:00:01.1/0000:02:00.0/net/eth0' is taking a long time
  [   91.836493] systemd-udevd[131]: error changing net interface name 'eth0' 
to 'enp2s0': File exists
  [   91.836583] systemd-udevd[131]: could not rename interface '3' from 'eth0' 
to 'enp2s0': File exists
  [   91.908818] raid6: sse2x1   gen()  5176 MB/s
  [   91.976808] raid6: sse2x1   xor()  5202 MB/s
  [   92.044810] raid6: sse2x2   gen() 10397 MB/s
  [   92.112810] raid6: sse2x2   xor()  8718 MB/s
  [   92.180800] raid6: sse2x4   gen() 15554 MB/s
  [   92.248797] raid6: sse2x4   xor() 11584 MB/s
  [   92.248872] raid6: using algorithm sse2x4 gen() 15554 MB/s

  
  systemd-udevd seems to get stuck quite a long time here.

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