[libvirt-users] "virsh list" ahngs

[Yunchih Chen]

On 02/20/2017 09:07 PM, Martin Kletzander wrote:
> 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.

Thanks for your help!  Please refer to the previous thread.
https://www.redhat.com/archives/libvirt-users/2017-February/msg00057.html

-- 
--
Yun-Chih Chen 陳耘志
Network/Workstation Assistant
Dept. of Computer Science and Information Engineering
National Taiwan University
Tel: +886-2-33664888 ext. 217/204
Email: ta217 at csie.ntu.edu.tw
Website: http://wslab.csie.ntu.edu.tw/