I could see this issue with same Call trace pasted above with ubuntu 
20.04/20.10/21.04.
Had a look at relevant kernel code and found all of them disable only ASPM L1.1 
rather than ASPM completely.Rebuilt the kernel by disabling whole ASPM feature 
this NETDEV WATCHDOG call trace disappears.
code hacked was like below:
pci_disable_link_state(pdev, PCIE_LINK_STATE_L1_1);//issue appears
 
pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S |
                                           PCIE_LINK_STATE_L1);//issue 
disappears

I believe the experiment shows there is ASPM issue with r8169 driver.Can
anyone share your view  on this problem which may shed some light on the
way forward.Is there a Realtek contact window we could reach out
ot.Thanks for anyone who can help.

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https://bugs.launchpad.net/bugs/1874464

Title:
  NETDEV WATCHDOG: enp5s0 (r8169): transmit queue 0 timed out

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