Hi,

I have compiled Linux v5.5-rc1 and thought all was good until I 
hot-removed a Gigabyte Aorus eGPU from Thunderbolt. The driver for the 
GPU was not loaded (blacklisted) so the crash is nothing to do with the 
GPU driver.

We had:
- kernel NULL pointer dereference
- refcount_t: underflow; use-after-free.

Attaching dmesg for now; will bisect and come back with results.

I am not sure why only this eGPU causes the issue - all my other devices 
do not trigger the bug.

I will shortly re-post my 4-patch series with some trivial alterations for v5.5.

Kind regards,
Nicholas