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Device on 04:00.0 has IRQ 16, and the remaining are on 255 Maybe that means something.

I have a hard nut to crack with starting the VM where 2 (the same type) PCIe network cards are connected with PCI passthrough. VM is running fine with one card, even if the second card is inserted in the PCIe slot. dmesg shows: [ 198.679707] vfio-pci 0000:0b:00.0: enabling device (0140 ->...

I have noticed that the problem occurs also on other VMs. Host machine specification: CPU(s) 48 x Intel(R) Xeon(R) CPU E7-4860 v2 @ 2.60GHz (2 Sockets) Kernel Version Linux 5.4.78-1-pve #1 SMP PVE 5.4.78-1 (Mon, 30 Nov 2020 10:57:47 +0100) Below logs from PBS and kernel messages from VM...

I have the same issue when the snapshot is created. This VM runs MongoDB server and I am pretty sure that crushes during the snapshot. [Wed Dec 9 23:53:17 2020] INFO: rcu_sched detected stalls on CPUs/tasks: [Wed Dec 9 23:53:17 2020] 9-...: (15 GPs behind) idle=5d3/1/0...