Re: [libvirt-users] "virsh list" hangs

On 02/24/2017 11:30 PM, Daniel P. Berrange wrote: > On Tue, Feb 21, 2017 at 12:07:41PM +0800, Yunchih Chen wrote: > > On 02/20/2017 09:10 PM, Michal Privoznik wrote: > > > On 17.02.2017 17:18, 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@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@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@vm-host:~# strace -o /tmp/trace -e trace=network,file,poll virsh > > > > list # hangs forever ..... > > > > ^C > > > > root@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@vm-host:~# lsof /var/run/libvirt/libvirt-sock # hangs too ... > > > This is very suspicious. Looks like the daemon is in some weird state > > > and hence virsh is unable to get list of domains. > > > > > > # ps axf | grep libvirtd > > > # gdb -p $(pgrep libvirtd) > > > (gdb) t a a bt > > > > > > if you could run those commands and share the output that might shed > > > more light. > > > > > > Michal > > Unfortunately, gdb also hangs when attaching to libvirt .... > > > > root@vm-host:~# gdb -q -p $(pgrep libvirtd) > > Attaching to process 9556 > > [New LWP 9557] > > [New LWP 9558] > > [New LWP 9559] > > [New LWP 9560] > > [New LWP 9561] > > [New LWP 9562] > > [New LWP 9563] > > [New LWP 9564] > > [New LWP 9565] > > [New LWP 9566] > > [New LWP 9567] > > [New LWP 9568] > > [New LWP 9569] > > [New LWP 9570] > > [New LWP 9571] > > [New LWP 9572] > > ^C^C^C^C^C^C^C^C^C^C^C > > > > It must be killed with SIGKILL, and libvirtd will die with gdb. > > > > Here[1] is the output of the following command: > > > > strace -o /tmp/gdb-full-trace.txt -s 1024 -f gdb -q -p $(pgrep libvirtd) > Err, that is useless - you've just straced GDB, not libvirtd > > You need to strace libvirtd as it starts > > strace -o libvirt.log -f -s 1000 /usr/sbin/libvirtd > Here[1] is the output of the above command. [1] https://www.csie.ntu.edu.tw/~yunchih/s/libvirtd-strace.log