Call trace after unbind of dGPU

Brief summary of the problem:

Unbinding my 5600 XT from the host cause a call trace to appear in dmesg without any real consequences or lockups

Hardware description:

• CPU: AMD Ryzen 5 3600 (12) @ 3.600GHz
• GPU: AMD Radeon RX 5600 XT

System information:

• Distro name: Arch Linux
• Kernel version: 5.14.5.arch1
• Custom kernel: Kernel from https://cgit.freedesktop.org/~agrodzov/linux, commit: "drm/amdgpu: Fix MMIO access page fault" + patch: 0001-drm-amdkfd-handle-svm-migrate-init-error.patch

How to reproduce the issue:

1. Boot one of the two kernels
2. From tty or graphical environment and as root issue the unbind command to your GPU: echo -n "xxxx:xx:xx.x" > /sys/bus/pci/drivers/amdgpu/unbind
3. Wait for the call trace in dmesg

Attached files:

• dmesg from 5.14.5.arch1: dm_arch_kernel
• dmesg from custom kernel: dm_custom_kernel