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My video card crashes from time to time. It's quite annoying but I live with it -- usually I just restart the graphics with sudo systemctl restart lightdm.service, or if needed reboot the whole system.

In this particular instance the systemctl call hangs, and I don't want to reboot since I have a long-running job on the machine.

The crash is logged in dmesg as

[944520.212254] Call Trace:
[944520.212256]  [<ffffffff818384d5>] schedule+0x35/0x80
[944520.212257]  [<ffffffff8183b625>] schedule_timeout+0x1b5/0x270
[944520.212280]  [<ffffffffc0235244>] ? dce_v6_0_program_watermarks+0x514/0x720 [amdgpu]
[944520.212282]  [<ffffffffc0196d2c>] kcl_fence_default_wait+0x1cc/0x260 [amdkcl]
[944520.212287]  [<ffffffff815b4f50>] ? fence_free+0x20/0x20

Clearly the amdgpu module crashed. I would like to restart it, so I tried

sudo modprobe -r amdgpu
modprobe: FATAL: Module amdgpu is in use.

And when I try to find out who is using amdgpu I get

lsmod | grep amdgpu
amdgpu               2129920  7
amdttm                102400  1 amdgpu
amdkcl                 32768  1 amdgpu
i2c_algo_bit           16384  1 amdgpu
drm_kms_helper        155648  1 amdgpu
drm                   364544  10 drm_kms_helper,amdgpu,amdkcl,amdttm

Basically there is 7 "things" using the module and I have no idea how to find them and remove the amdgpu module.

Question: Is there any reasonable way to reload the module, without rebooting the system? Or is there a better way to get my video back?

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