On Thu, Dec 28, 2023 at 01:03:10PM +1100, Steven Haigh wrote: > At some point in kernel 6.6.x, SCSI hotplug in qemu VMs broke. This was > mostly fixed in the following commit to release 6.6.8: > commit 5cc8d88a1b94b900fd74abda744c29ff5845430b > Author: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> > Date: Thu Dec 14 09:08:56 2023 -0600 > Revert "PCI: acpiphp: Reassign resources on bridge if necessary" > > After this commit, the SCSI block device is hotplugged correctly, and a device node as /dev/sdX appears within the qemu VM. > > New problem: > > When the same SCSI block device is hot-unplugged, the QEMU KVM process will > spin at 100% CPU usage. The guest shows no CPU being used via top, but the > host will continue to spin in the KVM thread until the VM is rebooted. Find out the PID of the qemu process on the host, then cat /proc/$PID/stack to see where the CPU time is spent.
