Happens for both TX and RX on Ubuntu 24.04.2 with kernel
6.11.0-21-generic and mainline kernel build 6.14.2-061402-generic. It
appears to be related to hangs at reboots and poweroffs.

The TX and RX warning happens,
- On suspension (s2idle)
- On reboot/poweroff
- After boot (if nvidia driver blacklisted)

Tests:
blacklist nvidia => happens after boot, reboot hangs
blacklist nvidia + immediate reboot => does not hang
not blacklist + reboot => does not hang
not blacklist + suspend => happens after suspend, reboot hangs
blacklist thunderbolt => does not hang regardless of suspension

Abnormal reboot behaviour is,
1. Same TX and RX warnings again
2. NX-protected page execution OR kernel NULL dereference
3. recursive fault (scheduling while atomic)
4. hanging there with cursor blinking; not responding to SysRq and no WDT 
warning but not panicking either.

Kernel logs from netconsole are attached below. Tails of logs are
truncated depending on the timing r8168 gets unloaded, but on screen it
always ends with the same recursive fault as shutdown-dmesg.txt.

** Attachment added: "shutdown-dmesg.txt"
   
https://bugs.launchpad.net/ubuntu/+source/linux-signed/+bug/2052411/+attachment/5871067/+files/shutdown-dmesg.txt

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https://bugs.launchpad.net/bugs/2052411

Title:
  thunderbolt: interrupt for TX ring 0 is already enabled

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