* Dr. David Alan Gilbert (dgilb...@redhat.com) wrote: > * Dr. David Alan Gilbert (dgilb...@redhat.com) wrote: > > Hi, > > I'm seeing a breakage on q35 migration on head (and possibly older > > but certainly head; it's also on a 2.5.0 world I've got with a bunch > > of patches but I've not tried a clean 2.5.0 yet). > > > > It looks like some type of interrupt screwup; with a virtio-net device > > I get a: > > BUG: soft lockup - CPU#0 stuck for 22s! > > ... virtnet_config_changed_work > > > > but if I swap that out for an e1000 I get: > > Disabling IRQ #22 > > > > and various timeouts on e1000 and cdrom (scsi). > > The guest kind of limps along with an existing terminal scrolling dmesg -w > > output. > > > > This is an f23 guest on a rhel7.2-ish host; with the guest sitting an idle > > (MATE) Gui. > > Also broken with 2.4.1 and 2.5.1 (with pc-q35-2.4 machine type); > see a screen shot attached; note: > a) The large count on irq 22 (enp2s1) on cpu1 > b) The large count on virtio2-config on cpu1 > c) The count of 'Deferred Error APIC interrupts'.
OK, this seems to be the i82801b11-bridge; if I remove it from the config it all works. My minimum config that fails so far is: /opt/qemu-head/bin/qemu-system-x86_64 -nographic -machine pc-q35-2.6,accel=kvm,usb=off,vmport=off -cpu SandyBridge -m 4096 -realtime mlock=off -smp 4,sockets=4,cores=1,threads=1 \ -device i82801b11-bridge,id=pci.1,bus=pcie.0,addr=0x1e \ -drive id=image,file=/home/vms/f23-serial.qcow2,if=none,cache=none \ -device virtio-blk-pci,scsi=off,bus=pci.1,addr=0x5,drive=image,id=virtio-disk0,bootindex=1 \ $* if I flip the i82801b11-bridge for a pci-bridge then it works. Dave -- Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK
