Hello David, Problem is our host is hangs for good and only ipmi reset can help in this case. We tried several kernels (upstream, mainline, old stable) even tested other distributions to no avail. Do you know if I can look at anything particular in debug logs to more closely identify problem? Regards, Alex. On Sun, 20 Jan 2019 10:50:35 -0500 David Hill <dhill@xxxxxxxxxx> wrote: > I'm having a similar issue these days... host machine networking hangs > for a little while when shutting down guests but connectivity resumes > once the guests are down. > > On 2019-01-10 7:11 a.m., Alex K wrote: > > Good day! > > > > We are using Ubuntu + KVM (via qemu and libvirt) and we've run into some difficulties. > > Host OS: > > Distributor ID: Ubuntu > > Description: Ubuntu 18.04.1 LTS > > Release: 18.04 > > Codename: bionic > > Spec server: > > Supermicro SYS-5017GR-TF > > CPU 1*Xeon E5-2690v2 > > RAM 6*8GB ECC > > SSD 2*1TB Samsung EVO860 > > GPU 2*GTX1070 > > Network HP523SFP 10G > > PSU 1200W > > VM guest: > > vCPU 8 threads > > RAM 16GB > > GPU 1*GTX1070 (using vfio-pci) > > netowrking - vepa with macvtap > > > > When the guest is receiving 'virsh destroy $vmname' command, the host machine hangs with > > "NMI Watchdog BUG: soft lockup - CPU # 2 stuck for 22s". > > > > How we tried to fix this issue: > > > > Update bios to latest version > > Updating to previous distro version, using alternatives (centos, debian) > > Replace hardware components (CPU, RAM, Network Card, HDD and SSD) > > Change some BIOS settings: > > > > Tried adjusting: > > PERR# Generation > > SERR# Generation > > Above 4G Decoding > > Cpu max performance > > Disabling internal NIC > > Removing excessive boot devices > > Power technology: various parameters > > enegry/performace bias: various parameters > > Pcie port: gen2 and gen3. > > > > Problems occur only when guests are going down and new ones are created. > > > > Attached files (console screenshots) > > > > https://drive.google.com/open?id=1AHCabWEy88A9pBK26D40LXFMWZMehejX > > https://drive.google.com/open?id=17VvCPVSWOJjEm-7nF9mrGNmd7vYNtR9x > > https://drive.google.com/open?id=1RBkBcCnTCRLGDwf59Lh8s0yeGvCiYhw7 > > > > > > > > Regards, Alex.
