Package: qemu Version: 1:2.8+dfsg-6+deb9u1 Severity: important Dear Maintainer,
after the latest qemu update (to 1:2.8+dfsg-6+deb9u1) I started observing instabilities in my x86_64 guest VMs. - A Centos 6.4 guest reliably locks up not more than 10 minutes after being booted. - A Ubuntu 14.10 occasionally hangs for a few seconds and the log contains the string "Clocksource tsc unstable (delta = 62606051 ns)". I have not observed any of these symptoms before the qemu update. A possible workaround for the Centos lock-up is to add the kernel option "no-kvmclock" to the kernel boot parameters in the guest. This seems to have stabilised the Centos VM for me. Please let me know if you need further description of my host or guest setup. Thanks, Thomas -- System Information: Debian Release: 9.1 APT prefers stable APT policy: (500, 'stable') Architecture: amd64 (x86_64) Kernel: Linux 4.12.3.tp (SMP w/8 CPU cores) Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_GB:en (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) Versions of packages qemu depends on: ii qemu-system 1:2.8+dfsg-6+deb9u1 ii qemu-user 1:2.8+dfsg-6+deb9u1 ii qemu-utils 1:2.8+dfsg-6+deb9u1 qemu recommends no packages. Versions of packages qemu suggests: pn qemu-user-static <none> -- no debconf information
