Kernel panic

I have provided manual upgrade in a remote machine as in https://www.openbsd.org/faq/upgrade77.html

I did it for several times before. After the first reboot I have got a kernel panic on bsd(.mp) and bsd(.sp). Older kernel (o)bsd 7.6 works fine, but it is mix up now. I have got a picture of the screen so it is not a full dmesg:

...

radeondrm0: RS880

r600_cp: Failed to load firmware "radeon/RS780_pfp.bin"

panic: pool_destroy: pool busy: still out: 2

...

ddb>

I did this upgrade a few times to be sure that I didn't an error.

Same result.

Please suggest what to do in that situation.

Regards

Zbigniew Kossowski