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Yunchih Chen

2017-Feb-17 16:18 UTC

[libvirt-users] "virsh list" hangs

`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 ...
^C

root@vm-host:~# LIBVIRT_DEBUG=1 virsh list
2017-02-17 15:58:36.126+0000: 18505: info : libvirt version: 3.0.0, 
package: 2 (Guido Günther <agx@sigxcpu.org> Wed, 25 Jan 2017 07:04:08
+0100)
2017-02-17 15:58:36.126+0000: 18505: info : hostname: vm-host
2017-02-17 15:58:36.126+0000: 18505: debug : virGlobalInit:386 : 
register drivers
2017-02-17 15:58:36.127+0000: 18505: debug : 
virRegisterConnectDriver:684 : driver=0x7f1e5aca2c40 name=Test
2017-02-17 15:58:36.127+0000: 18505: debug : 
virRegisterConnectDriver:695 : registering Test as driver 0
2017-02-17 15:58:36.127+0000: 18505: debug : 
virRegisterConnectDriver:684 : driver=0x7f1e5aca4ac0 name=OPENVZ
2017-02-17 15:58:36.127+0000: 18505: debug : 
virRegisterConnectDriver:695 : registering OPENVZ as driver 1
2017-02-17 15:58:36.127+0000: 18505: debug : 
virRegisterConnectDriver:684 : driver=0x7f1e5aca5260 name=VMWARE
2017-02-17 15:58:36.127+0000: 18505: debug : 
virRegisterConnectDriver:695 : registering VMWARE as driver 2
2017-02-17 15:58:36.127+0000: 18505: debug : 
virRegisterConnectDriver:684 : driver=0x7f1e5aca3720 name=remote
2017-02-17 15:58:36.127+0000: 18505: debug : 
virRegisterConnectDriver:695 : registering remote as driver 3
2017-02-17 15:58:36.127+0000: 18505: debug : 
virEventRegisterDefaultImpl:267 : registering default event implementation
2017-02-17 15:58:36.127+0000: 18505: debug : virEventPollAddHandle:115 : 
Used 0 handle slots, adding at least 10 more
2017-02-17 15:58:36.127+0000: 18505: debug : 
virEventPollInterruptLocked:722 : Skip interrupt, 0 0
2017-02-17 15:58:36.127+0000: 18505: info : virEventPollAddHandle:140 : 
EVENT_POLL_ADD_HANDLE: watch=1 fd=3 events=1 cb=0x7f1e5a7fc140 
opaque=(nil) ff=(nil)
2017-02-17 15:58:36.127+0000: 18505: debug : virEventRegisterImpl:234 : 
addHandle=0x7f1e5a7fc860 updateHandle=0x7f1e5a7fcb90 
removeHandle=0x7f1e5a7fc1a0 addTimeout=0x7f1e5a7fc310 
updateTimeout=0x7f1e5a7fc510 removeTimeout=0x7f1e5a7fc6e0
2017-02-17 15:58:36.127+0000: 18505: debug : virEventPollAddTimeout:230 
: Used 0 timeout slots, adding at least 10 more
2017-02-17 15:58:36.127+0000: 18505: debug : 
virEventPollInterruptLocked:722 : Skip interrupt, 0 0
2017-02-17 15:58:36.127+0000: 18505: info : virEventPollAddTimeout:253 : 
EVENT_POLL_ADD_TIMEOUT: timer=1 frequency=-1 cb=0x563a29758360 
opaque=0x7fff70941380 ff=(nil)
2017-02-17 15:58:36.127+0000: 18505: debug : virConnectOpenAuth:1245 : 
name=<null>, auth=0x7f1e5aca2a00, flags=0
2017-02-17 15:58:36.127+0000: 18505: info : virObjectNew:202 : 
OBJECT_NEW: obj=0x563a2a7f5f50 classname=virConnect
2017-02-17 15:58:36.127+0000: 18505: debug : virConfLoadConfig:1604 : 
Loading config file '/etc/libvirt/libvirt.conf'
2017-02-17 15:58:36.127+0000: 18505: debug : virConfReadFile:778 : 
filename=/etc/libvirt/libvirt.conf
2017-02-17 15:58:36.127+0000: 18506: debug : virThreadJobSet:99 : Thread 
18506 is now running job vshEventLoop
2017-02-17 15:58:36.127+0000: 18506: debug : virEventRunDefaultImpl:311 
: running default event implementation
2017-02-17 15:58:36.127+0000: 18505: debug : virFileClose:108 : Closed fd 5
2017-02-17 15:58:36.127+0000: 18506: debug : 
virEventPollCleanupTimeouts:525 : Cleanup 1
2017-02-17 15:58:36.127+0000: 18506: debug : 
virEventPollCleanupHandles:574 : Cleanup 1
2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add 
entry (null) (nil)
2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add 
entry (null) (nil)
2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add 
entry (null) (nil)
2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollMakePollFDs:401 
: Prepare n=0 w=1, f=3 e=1 d=0
2017-02-17 15:58:36.127+0000: 18506: debug : 
virEventPollCalculateTimeout:338 : Calculate expiry of 1 timers
2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add 
entry (null) (nil)
2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add 
entry (null) (nil)
2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add 
entry (null) (nil)
2017-02-17 15:58:36.127+0000: 18506: debug : 
virEventPollCalculateTimeout:371 : No timeout is pending
2017-02-17 15:58:36.127+0000: 18506: info : virEventPollRunOnce:640 : 
EVENT_POLL_RUN: nhandles=1 timeout=-1
2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add 
entry (null) (nil)
2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add 
entry (null) (nil)
2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add 
entry (null) (nil)
2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add 
entry (null) (nil)
2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add 
entry (null) (nil)
2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add 
entry (null) (nil)
2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add 
entry (null) (nil)
2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add 
entry (null) (nil)
2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add 
entry (null) (nil)
2017-02-17 15:58:36.127+0000: 18505: debug : virConfAddEntry:241 : Add 
entry (null) (nil)
2017-02-17 15:58:36.127+0000: 18505: debug : virConfGetValueString:932 : 
Get value string (nil) 0
2017-02-17 15:58:36.127+0000: 18505: debug : virConnectOpenInternal:1040 
: no name, allowing driver auto-select
2017-02-17 15:58:36.127+0000: 18505: debug : virConnectOpenInternal:1083 
: trying driver 0 (Test) ...
2017-02-17 15:58:36.127+0000: 18505: debug : virConnectOpenInternal:1098 
: driver 0 Test returned DECLINED
2017-02-17 15:58:36.127+0000: 18505: debug : virConnectOpenInternal:1083 
: trying driver 1 (OPENVZ) ...
2017-02-17 15:58:36.127+0000: 18505: debug : virConnectOpenInternal:1098 
: driver 1 OPENVZ returned DECLINED
2017-02-17 15:58:36.127+0000: 18505: debug : virConnectOpenInternal:1083 
: trying driver 2 (VMWARE) ...
2017-02-17 15:58:36.127+0000: 18505: debug : virConnectOpenInternal:1098 
: driver 2 VMWARE returned DECLINED
2017-02-17 15:58:36.127+0000: 18505: debug : virConnectOpenInternal:1083 
: trying driver 3 (remote) ...
2017-02-17 15:58:36.127+0000: 18505: debug : remoteConnectOpen:1343 : 
Auto-probe remote URI
2017-02-17 15:58:36.127+0000: 18505: debug : doRemoteOpen:907 : 
proceeding with name 2017-02-17 15:58:36.127+0000: 18505: debug :
doRemoteOpen:916 :
Connecting with transport 1
2017-02-17 15:58:36.127+0000: 18505: debug : doRemoteOpen:1051 : 
Proceeding with sockname /var/run/libvirt/libvirt-sock
2017-02-17 15:58:36.127+0000: 18505: debug : 
virNetSocketNewConnectUNIX:639 : path=/var/run/libvirt/libvirt-sock 
spawnDaemon=0 binary=<null>
2017-02-17 15:58:36.127+0000: 18505: debug : 
virNetSocketNewConnectUNIX:703 : connect() succeeded
2017-02-17 15:58:36.127+0000: 18505: debug : virNetSocketNew:235 : 
localAddr=0x7fff70940d00 remoteAddr=0x7fff70940d90 fd=5 errfd=-1 pid=0
2017-02-17 15:58:36.127+0000: 18505: info : virObjectNew:202 : 
OBJECT_NEW: obj=0x563a2a7f7980 classname=virNetSocket
2017-02-17 15:58:36.127+0000: 18505: info : virNetSocketNew:291 : 
RPC_SOCKET_NEW: sock=0x563a2a7f7980 fd=5 errfd=-1 pid=0 
localAddr=127.0.0.1;0, remoteAddr=127.0.0.1;0
2017-02-17 15:58:36.127+0000: 18505: info : virObjectNew:202 : 
OBJECT_NEW: obj=0x563a2a7f7d80 classname=virNetClient
2017-02-17 15:58:36.127+0000: 18505: info : virNetClientNew:328 : 
RPC_CLIENT_NEW: client=0x563a2a7f7d80 sock=0x563a2a7f7980
2017-02-17 15:58:36.127+0000: 18505: info : virObjectRef:296 : 
OBJECT_REF: obj=0x563a2a7f7d80
2017-02-17 15:58:36.127+0000: 18505: info : virObjectRef:296 : 
OBJECT_REF: obj=0x563a2a7f7980
2017-02-17 15:58:36.127+0000: 18505: debug : 
virEventPollInterruptLocked:726 : Interrupting
2017-02-17 15:58:36.127+0000: 18505: info : virEventPollAddHandle:140 : 
EVENT_POLL_ADD_HANDLE: watch=2 fd=5 events=1 cb=0x7f1e5a96cd10 
opaque=0x563a2a7f7980 ff=0x7f1e5a96ccc0
2017-02-17 15:58:36.127+0000: 18505: debug : virKeepAliveNew:199 : 
client=0x563a2a7f7d80, interval=-1, count=0
2017-02-17 15:58:36.127+0000: 18505: info : virObjectNew:202 : 
OBJECT_NEW: obj=0x563a2a7f8080 classname=virKeepAlive
2017-02-17 15:58:36.127+0000: 18505: info : virKeepAliveNew:218 : 
RPC_KEEPALIVE_NEW: ka=0x563a2a7f8080 client=0x563a2a7f7d80
2017-02-17 15:58:36.127+0000: 18505: info : virObjectRef:296 : 
OBJECT_REF: obj=0x563a2a7f7d80
2017-02-17 15:58:36.127+0000: 18505: info : virObjectNew:202 : 
OBJECT_NEW: obj=0x563a2a7f6740 classname=virConnectCloseCallbackData
2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollRunOnce:650 : 
Poll got 1 event(s)
2017-02-17 15:58:36.127+0000: 18506: debug : 
virEventPollDispatchTimeouts:432 : Dispatch 1
2017-02-17 15:58:36.127+0000: 18505: info : virObjectRef:296 : 
OBJECT_REF: obj=0x563a2a7f6740
2017-02-17 15:58:36.127+0000: 18506: debug : 
virEventPollDispatchHandles:478 : Dispatch 1
2017-02-17 15:58:36.127+0000: 18505: info : virObjectNew:202 : 
OBJECT_NEW: obj=0x563a2a7f7fa0 classname=virNetClientProgram
2017-02-17 15:58:36.127+0000: 18505: info : virObjectNew:202 : 
OBJECT_NEW: obj=0x563a2a7f7b60 classname=virNetClientProgram
2017-02-17 15:58:36.127+0000: 18505: info : virObjectNew:202 : 
OBJECT_NEW: obj=0x563a2a7f7910 classname=virNetClientProgram
2017-02-17 15:58:36.127+0000: 18506: debug : 
virEventPollDispatchHandles:492 : i=0 w=1
2017-02-17 15:58:36.127+0000: 18505: info : virObjectRef:296 : 
OBJECT_REF: obj=0x563a2a7f7fa0
2017-02-17 15:58:36.127+0000: 18506: info : 
virEventPollDispatchHandles:506 : EVENT_POLL_DISPATCH_HANDLE: watch=1 
events=1
2017-02-17 15:58:36.127+0000: 18505: info : virObjectRef:296 : 
OBJECT_REF: obj=0x563a2a7f7b60
2017-02-17 15:58:36.127+0000: 18506: debug : 
virEventPollCleanupTimeouts:525 : Cleanup 1
2017-02-17 15:58:36.127+0000: 18505: info : virObjectRef:296 : 
OBJECT_REF: obj=0x563a2a7f7910
2017-02-17 15:58:36.127+0000: 18506: debug : 
virEventPollCleanupHandles:574 : Cleanup 2
2017-02-17 15:58:36.127+0000: 18505: debug : doRemoteOpen:1170 : Trying 
authentication
2017-02-17 15:58:36.127+0000: 18506: debug : virEventRunDefaultImpl:311 
: running default event implementation
2017-02-17 15:58:36.127+0000: 18505: debug : virNetMessageNew:46 : 
msg=0x563a2a7fa470 tracked=0
2017-02-17 15:58:36.127+0000: 18506: debug : 
virEventPollCleanupTimeouts:525 : Cleanup 1
2017-02-17 15:58:36.127+0000: 18506: debug : 
virEventPollCleanupHandles:574 : Cleanup 2
2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollMakePollFDs:401 
: Prepare n=0 w=1, f=3 e=1 d=0
2017-02-17 15:58:36.127+0000: 18505: debug : 
virNetMessageEncodePayload:386 : Encode length as 28
2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollMakePollFDs:401 
: Prepare n=1 w=2, f=5 e=1 d=0
2017-02-17 15:58:36.127+0000: 18505: info : 
virNetClientSendInternal:2104 : RPC_CLIENT_MSG_TX_QUEUE: 
client=0x563a2a7f7d80 len=28 prog=536903814 vers=1 proc=66 type=0 
status=0 serial=0
2017-02-17 15:58:36.127+0000: 18506: debug : 
virEventPollCalculateTimeout:338 : Calculate expiry of 1 timers
2017-02-17 15:58:36.127+0000: 18505: debug : virNetClientCallNew:2057 : 
New call 0x563a2a7f7340: msg=0x563a2a7fa470, expectReply=1, nonBlock=0
2017-02-17 15:58:36.127+0000: 18506: debug : 
virEventPollCalculateTimeout:371 : No timeout is pending
2017-02-17 15:58:36.127+0000: 18505: debug : virNetClientIO:1866 : 
Outgoing message prog=536903814 version=1 serial=0 proc=66 type=0 
length=28 dispatch=(nil)
2017-02-17 15:58:36.127+0000: 18506: info : virEventPollRunOnce:640 : 
EVENT_POLL_RUN: nhandles=2 timeout=-1
2017-02-17 15:58:36.127+0000: 18505: debug : virNetClientIO:1925 : We 
have the buck head=0x563a2a7f7340 call=0x563a2a7f7340
2017-02-17 15:58:36.127+0000: 18505: info : virEventPollUpdateHandle:152 
: EVENT_POLL_UPDATE_HANDLE: watch=2 events=0
2017-02-17 15:58:36.127+0000: 18505: debug : 
virEventPollInterruptLocked:726 : Interrupting
2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollRunOnce:650 : 
Poll got 1 event(s)
2017-02-17 15:58:36.127+0000: 18506: debug : 
virEventPollDispatchTimeouts:432 : Dispatch 1
2017-02-17 15:58:36.127+0000: 18506: debug : 
virEventPollDispatchHandles:478 : Dispatch 2
2017-02-17 15:58:36.127+0000: 18506: debug : 
virEventPollDispatchHandles:492 : i=0 w=1
2017-02-17 15:58:36.127+0000: 18506: info : 
virEventPollDispatchHandles:506 : EVENT_POLL_DISPATCH_HANDLE: watch=1 
events=1
2017-02-17 15:58:36.127+0000: 18506: debug : 
virEventPollCleanupTimeouts:525 : Cleanup 1
2017-02-17 15:58:36.127+0000: 18506: debug : 
virEventPollCleanupHandles:574 : Cleanup 2
2017-02-17 15:58:36.127+0000: 18506: debug : virEventRunDefaultImpl:311 
: running default event implementation
2017-02-17 15:58:36.127+0000: 18506: debug : 
virEventPollCleanupTimeouts:525 : Cleanup 1
2017-02-17 15:58:36.127+0000: 18506: debug : 
virEventPollCleanupHandles:574 : Cleanup 2
2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollMakePollFDs:401 
: Prepare n=0 w=1, f=3 e=1 d=0
2017-02-17 15:58:36.127+0000: 18506: debug : virEventPollMakePollFDs:401 
: Prepare n=1 w=2, f=5 e=0 d=0
2017-02-17 15:58:36.128+0000: 18506: debug : 
virEventPollCalculateTimeout:338 : Calculate expiry of 1 timers
2017-02-17 15:58:36.128+0000: 18506: debug : 
virEventPollCalculateTimeout:371 : No timeout is pending
2017-02-17 15:58:36.128+0000: 18506: info : virEventPollRunOnce:640 : 
EVENT_POLL_RUN: nhandles=1 timeout=-1
^C


-- 
--
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@csie.ntu.edu.tw
Website: http://wslab.csie.ntu.edu.tw/

Michal Privoznik

2017-Feb-20 13:10 UTC

head link

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

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

Yunchih Chen

2017-Feb-21 04:07 UTC

head link

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

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)

Thanks for your help : )

[1] https://www.csie.ntu.edu.tw/~yunchih/s/gdb-full-trace.txt

-- 
--
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@csie.ntu.edu.tw
Website: http://wslab.csie.ntu.edu.tw/

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