[libvirt-users] "virsh list" ahngs

[Martin Kletzander]

On Sat, Feb 18, 2017 at 12:21:31AM +0800, Yunchih Chen wrote:
>
>`virsh list` hangs on my server that hosts a bunch of VMs.
>This might be due to the Debian upgrade I did on Feb 15, which upgrades
>`libvirt` from 2.4.0-1 to 3.0.0-2.
>I have tried restarting libvirtd for a few times, without luck.
>
>Attached below are some relevant logs; let me know if you need some more
>for debugging.
>Thanks for your help!!
>
>root at vm-host:~# uname -a
>Linux vm-host 4.6.0-1-amd64 #1 SMP Debian 4.6.4-1 (2016-07-18) x86_64
>GNU/Linux
>
>root at vm-host:~# apt-cache policy libvirt-daemon
>libvirt-daemon:
>   Installed: 3.0.0-2
>   Candidate: 3.0.0-2
>   Version table:
>  *** 3.0.0-2 500
>         500 http://debian.csie.ntu.edu.tw/debian testing/main amd64
>Packages
>         100 /var/lib/dpkg/status
>
>root at vm-host:~# strace -o /tmp/trace -e trace=network,file,poll virsh
>list  # hangs forever .....
>^C
>root at vm-host:~# tail -10 /tmp/trace
>access("/etc/libvirt/libvirt.conf", F_OK) = 0
>open("/etc/libvirt/libvirt.conf", O_RDONLY) = 5
>access("/proc/vz", F_OK)                = -1 ENOENT (No such file or
>directory)
>socket(AF_UNIX, SOCK_STREAM, 0)         = 5
>connect(5, {sa_family=AF_UNIX,
>sun_path="/var/run/libvirt/libvirt-sock"}, 110) = 0
>getsockname(5, {sa_family=AF_UNIX}, [128->2]) = 0
>poll([{fd=5, events=POLLOUT}, {fd=6, events=POLLIN}], 2, -1) = 1
>([{fd=5, revents=POLLOUT}])
>poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, -1) = ?
>ERESTART_RESTARTBLOCK (Interrupted by signal)
>--- SIGINT {si_signo=SIGINT, si_code=SI_KERNEL} ---
>+++ killed by SIGINT +++
>
>root at vm-host:~# lsof /var/run/libvirt/libvirt-sock # hangs too ...
>^C
>

This is weird =)  Can you attach to libvirtd using gdb (with installed
debuginfo) and run 't a a bt' to see where the daemon hangs?  I think
it's not accepting connections and that's what virsh is waiting for.
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