As I wrote, I made new test on kernel Linux version 5.1.0-050100-generic amd64:
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.1/
Same problem, system crash after a few seconds. Full kern.log: https://paste.ee/p/EmLsw

Unfortunately, I can't judge if the patch is there, but I found, that this patch was added to kernel 5.0.2:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/iommu/amd_iommu.c?id=4e50ce03976fbc8ae995a000c4b10c737467beaa
Can I somehow verify that the patch is in this ubuntu kernel 5.1.0?

starosta

Dne 15.5.2019 v 11:17 Oliver Neukum napsal(a):

On Mi, 2019-05-15 at 09:54 +0200,  StarostaCZ@gmail.com  wrote:

Hello,
can I still help with this problem? It's very important for us. Thank you.

Your first step would be t verify whether your kernel has the
fix coming in the patch Joerg mentioned.

	Regards
		Oliver