For anyone who might find this thread from online searching, I was able to
determine this commit fixes the above issue:

https://libvirt.org/git/?p=libvirt.git;a=commitdiff;h=dddcb601ebf97ef222a03bb27b2357e831e8a0cc


On Tue, Oct 2, 2018 at 8:42 AM Scott Sullivan <
scottgregorysulli...@gmail.com> wrote:

> I'm trying the following command on the source machine:
>
> virsh migrate --live --copy-storage-all  --verbose TEST qemu+ssh://
> 10.30.76.66/system
>
> If I ssh into the destination machine when this command is running, I can
> see NBD copying data as expected, and if I wait long enough it completes
> and succeeds.
>
> However if I ctrl+c this command above before it completes, it causes
> virsh commands (like virsh list) to just hang seemingly forever on the
> destination machine.
>
> Here's the libvirt debug entries when I run virsh list in this state:
>
> [root@host ~]# export LIBVIRT_DEBUG=1
> [root@host ~]# virsh list
> 2018-10-02 05:14:05.053+0000: 16207: debug : virGlobalInit:359 : register
> drivers
> 2018-10-02 05:14:05.054+0000: 16207: debug : virRegisterConnectDriver:657
> : driver=0x7f70c1ddbb60 name=Test
> 2018-10-02 05:14:05.054+0000: 16207: debug : virRegisterConnectDriver:668
> : registering Test as driver 0
> 2018-10-02 05:14:05.054+0000: 16207: debug : virRegisterConnectDriver:657
> : driver=0x7f70c1ddc660 name=ESX
> 2018-10-02 05:14:05.054+0000: 16207: debug : virRegisterConnectDriver:668
> : registering ESX as driver 12018-10-02 05:14:05.054+0000: 16207: debug :
> virRegisterConnectDriver:657 : driver=0x7f70c1ddd560 name=remote
>
> 2018-10-02 05:14:05.054+0000: 16207: debug : virRegisterConnectDriver:668
> : registering remote as driver 2
> 2018-10-02 05:14:05.054+0000: 16207: debug :
> virEventRegisterDefaultImpl:280 : registering default event implementation
> 2018-10-02 05:14:05.054+0000: 16207: debug : virEventPollAddHandle:115 :
> Used 0 handle slots, adding at least 10 more
> 2018-10-02 05:14:05.054+0000: 16207: debug :
> virEventPollInterruptLocked:722 : Skip interrupt, 0 0
>
> 2018-10-02 05:14:05.054+0000: 16207: info : virEventPollAddHandle:140 :
> EVENT_POLL_ADD_HANDLE: watch=1 fd=4 events=1 cb=0x7f70c18791c0 opaque=(nil)
> ff=(nil)
> 2018-10-02 05:14:05.054+0000: 16207: debug : virEventRegisterImpl:241 :
> addHandle=0x7f70c187a8a0 updateHandle=0x7f70c1879500
> removeHandle=0x7f70c1879360 addTimeout=0x7f70c187a660
> updateTimeout=0x7f70c1879690 removeTimeout=0x7f70c1879220
> 2018-10-02 05:14:05.054+0000: 16207: debug : virEventPollAddTimeout:230 :
> Used 0 timeout slots, adding at least 10 more2018-10-02 05:14:05.054+0000:
> 16207: debug : virEventPollInterruptLocked:722 : Skip interrupt, 0 0
> 2018-10-02 05:14:05.054+0000: 16207: info : virEventPollAddTimeout:253 :
> EVENT_POLL_ADD_TIMEOUT: timer=1 frequency=-1 cb=0x5559f8dba380
> opaque=0x7ffe5b15e700 ff=(nil)
> 2018-10-02 05:14:05.054+0000: 16207: debug : virConnectOpenAuth:1218 :
> name=<null>, auth=0x7f70c1ddea00, flags=0x0
> 2018-10-02 05:14:05.054+0000: 16207: info : virObjectNew:254 : OBJECT_NEW:
> obj=0x5559fa83a3f0 classname=virConnect
>                           2018-10-02 05:14:05.054+0000: 16208: debug :
> virThreadJobSet:99 : Thread 16208 is now running job vshEventLoop
> 2018-10-02 05:14:05.054+0000: 16208: debug : virEventRunDefaultImpl:324 :
> running default event implementation
> 2018-10-02 05:14:05.054+0000: 16207: debug : virConfLoadConfig:1576 :
> Loading config file '/etc/libvirt/libvirt.conf'
> 2018-10-02 05:14:05.054+0000: 16208: debug :
> virEventPollCleanupTimeouts:525 : Cleanup 1
> 2018-10-02 05:14:05.054+0000: 16208: debug :
> virEventPollCleanupHandles:574 : Cleanup 1
> 2018-10-02 05:14:05.054+0000: 16207: debug : virConfReadFile:752 :
> filename=/etc/libvirt/libvirt.conf
> 2018-10-02 05:14:05.054+0000: 16208: debug : virEventPollMakePollFDs:401 :
> Prepare n=0 w=1, f=4 e=1 d=0
> 2018-10-02 05:14:05.054+0000: 16208: debug :
> virEventPollCalculateTimeout:338 : Calculate expiry of 1 timers
> 2018-10-02 05:14:05.054+0000: 16208: debug :
> virEventPollCalculateTimeout:371 : No timeout is pending
> 2018-10-02 05:14:05.054+0000: 16208: info : virEventPollRunOnce:640 :
> EVENT_POLL_RUN: nhandles=1 timeout=-1
> 2018-10-02 05:14:05.054+0000: 16207: debug : virFileClose:110 : Closed fd 6
> 2018-10-02 05:14:05.054+0000: 16207: debug : virConfGetValueString:897 :
> Get value string (nil) 0
> 2018-10-02 05:14:05.054+0000: 16207: debug : virConnectOpenInternal:1013 :
> no name, allowing driver auto-select
> 2018-10-02 05:14:05.054+0000: 16207: debug : virConnectOpenInternal:1056 :
> trying driver 0 (Test) ...
> 2018-10-02 05:14:05.054+0000: 16207: debug : virConnectOpenInternal:1071 :
> driver 0 Test returned DECLINED
> 2018-10-02 05:14:05.054+0000: 16207: debug : virConnectOpenInternal:1056 :
> trying driver 1 (ESX) ...
> 2018-10-02 05:14:05.054+0000: 16207: debug : virConnectOpenInternal:1071 :
> driver 1 ESX returned DECLINED
> 2018-10-02 05:14:05.054+0000: 16207: debug : virConnectOpenInternal:1056 :
> trying driver 2 (remote) ...
> 2018-10-02 05:14:05.054+0000: 16207: debug : remoteConnectOpen:1350 :
> Auto-probe remote URI
> 2018-10-02 05:14:05.054+0000: 16207: debug : doRemoteOpen:916 : proceeding
> with name =
> 2018-10-02 05:14:05.054+0000: 16207: debug : doRemoteOpen:925 : Connecting
> with transport 1
> 2018-10-02 05:14:05.054+0000: 16207: debug : doRemoteOpen:1060 :
> Proceeding with sockname /var/run/libvirt/libvirt-sock
> 2018-10-02 05:14:05.054+0000: 16207: debug :
> virNetSocketNewConnectUNIX:641 : path=/var/run/libvirt/libvirt-sock
> spawnDaemon=0 binary=<null>
> 2018-10-02 05:14:05.054+0000: 16207: debug :
> virNetSocketNewConnectUNIX:705 : connect() succeeded
> 2018-10-02 05:14:05.054+0000: 16207: debug : virNetSocketNew:237 :
> localAddr=0x7ffe5b15dd80 remoteAddr=0x7ffe5b15dcf0 fd=6 errfd=-1 pid=0
> 2018-10-02 05:14:05.054+0000: 16207: info : virObjectNew:254 : OBJECT_NEW:
> obj=0x5559fa83aa20 classname=virNetSocket
> 2018-10-02 05:14:05.054+0000: 16207: info : virNetSocketNew:293 :
> RPC_SOCKET_NEW: sock=0x5559fa83aa20 fd=6 errfd=-1 pid=0
> localAddr=127.0.0.1;0, remoteAddr=127.0.0.1;0
> 2018-10-02 05:14:05.054+0000: 16207: info : virObjectNew:254 : OBJECT_NEW:
> obj=0x5559fa83ae20 classname=virNetClient
> 2018-10-02 05:14:05.055+0000: 16207: info : virNetClientNew:328 :
> RPC_CLIENT_NEW: client=0x5559fa83ae20 sock=0x5559fa83aa20
> 2018-10-02 05:14:05.055+0000: 16207: info : virObjectRef:388 : OBJECT_REF:
> obj=0x5559fa83ae20
> 2018-10-02 05:14:05.055+0000: 16207: info : virObjectRef:388 : OBJECT_REF:
> obj=0x5559fa83aa20
> 2018-10-02 05:14:05.055+0000: 16207: debug :
> virEventPollInterruptLocked:726 : Interrupting
> 2018-10-02 05:14:05.055+0000: 16207: info : virEventPollAddHandle:140 :
> EVENT_POLL_ADD_HANDLE: watch=2 fd=6 events=1 cb=0x7f70c19b4df0
> opaque=0x5559fa83aa20 ff=0x7f70c19b5320
> 2018-10-02 05:14:05.055+0000: 16207: debug : virKeepAliveNew:196 :
> client=0x5559fa83ae20, interval=-1, count=0
> 2018-10-02 05:14:05.055+0000: 16207: info : virObjectNew:254 : OBJECT_NEW:
> obj=0x5559fa83b120 classname=virKeepAlive
> 2018-10-02 05:14:05.055+0000: 16208: debug : virEventPollRunOnce:650 :
> Poll got 1 event(s)
> 2018-10-02 05:14:05.055+0000: 16207: info : virKeepAliveNew:215 :
> RPC_KEEPALIVE_NEW: ka=0x5559fa83b120 client=0x5559fa83ae20
> 2018-10-02 05:14:05.055+0000: 16208: debug :
> virEventPollDispatchTimeouts:432 : Dispatch 1
> 2018-10-02 05:14:05.055+0000: 16207: info : virObjectRef:388 : OBJECT_REF:
> obj=0x5559fa83ae20
> 2018-10-02 05:14:05.055+0000: 16208: debug :
> virEventPollDispatchHandles:478 : Dispatch 1
> 2018-10-02 05:14:05.055+0000: 16207: info : virObjectNew:254 : OBJECT_NEW:
> obj=0x5559fa83b340 classname=virConnectCloseCallbackData
> 2018-10-02 05:14:05.055+0000: 16208: debug :
> virEventPollDispatchHandles:492 : i=0 w=1
> 2018-10-02 05:14:05.055+0000: 16207: info : virObjectRef:388 : OBJECT_REF:
> obj=0x5559fa83b340
> 2018-10-02 05:14:05.055+0000: 16208: info :
> virEventPollDispatchHandles:506 : EVENT_POLL_DISPATCH_HANDLE: watch=1
> events=1
> 2018-10-02 05:14:05.055+0000: 16207: info : virObjectNew:254 : OBJECT_NEW:
> obj=0x5559fa83b040 classname=virNetClientProgram
> 2018-10-02 05:14:05.055+0000: 16208: debug :
> virEventPollCleanupTimeouts:525 : Cleanup 1
> 2018-10-02 05:14:05.055+0000: 16207: info : virObjectNew:254 : OBJECT_NEW:
> obj=0x5559fa83ac00 classname=virNetClientProgram
> 2018-10-02 05:14:05.055+0000: 16208: debug :
> virEventPollCleanupHandles:574 : Cleanup 2
> 2018-10-02 05:14:05.055+0000: 16207: info : virObjectNew:254 : OBJECT_NEW:
> obj=0x5559fa83a9b0 classname=virNetClientProgram
> 2018-10-02 05:14:05.055+0000: 16208: debug : virEventRunDefaultImpl:324 :
> running default event implementation
> 2018-10-02 05:14:05.055+0000: 16207: info : virObjectRef:388 : OBJECT_REF:
> obj=0x5559fa83b040
> 2018-10-02 05:14:05.055+0000: 16208: debug :
> virEventPollCleanupTimeouts:525 : Cleanup 1
> 2018-10-02 05:14:05.055+0000: 16207: info : virObjectRef:388 : OBJECT_REF:
> obj=0x5559fa83ac00
> 2018-10-02 05:14:05.055+0000: 16208: debug :
> virEventPollCleanupHandles:574 : Cleanup 2
> 2018-10-02 05:14:05.055+0000: 16207: info : virObjectRef:388 : OBJECT_REF:
> obj=0x5559fa83a9b0
> 2018-10-02 05:14:05.055+0000: 16207: debug : doRemoteOpen:1179 : Trying
> authentication
> 2018-10-02 05:14:05.055+0000: 16208: debug : virEventPollMakePollFDs:401 :
> Prepare n=0 w=1, f=4 e=1 d=0
> 2018-10-02 05:14:05.055+0000: 16208: debug : virEventPollMakePollFDs:401 :
> Prepare n=1 w=2, f=6 e=1 d=0
> 2018-10-02 05:14:05.055+0000: 16207: debug : virNetMessageNew:46 :
> msg=0x5559fa83b720 tracked=0
> 2018-10-02 05:14:05.055+0000: 16208: debug :
> virEventPollCalculateTimeout:338 : Calculate expiry of 1 timers
> 2018-10-02 05:14:05.055+0000: 16208: debug :
> virEventPollCalculateTimeout:371 : No timeout is pending
> 2018-10-02 05:14:05.055+0000: 16207: debug :
> virNetMessageEncodePayload:389 : Encode length as 28
> 2018-10-02 05:14:05.055+0000: 16208: info : virEventPollRunOnce:640 :
> EVENT_POLL_RUN: nhandles=2 timeout=-1
> 2018-10-02 05:14:05.055+0000: 16207: info : virNetClientSendInternal:2121
> : RPC_CLIENT_MSG_TX_QUEUE: client=0x5559fa83ae20 len=28 prog=536903814
> vers=1 proc=66 type=0 status=0 serial=0
> 2018-10-02 05:14:05.055+0000: 16207: debug : virNetClientCallNew:2074 :
> New call 0x5559fa83b6a0: msg=0x5559fa83b720, expectReply=1, nonBlock=0
> 2018-10-02 05:14:05.055+0000: 16207: debug : virNetClientIO:1880 :
> Outgoing message prog=536903814 version=1 serial=0 proc=66 type=0 length=28
> dispatch=(nil)
> 2018-10-02 05:14:05.055+0000: 16207: debug : virNetClientIO:1939 : We have
> the buck head=0x5559fa83b6a0 call=0x5559fa83b6a0
> 2018-10-02 05:14:05.055+0000: 16207: info : virEventPollUpdateHandle:152 :
> EVENT_POLL_UPDATE_HANDLE: watch=2 events=0
> 2018-10-02 05:14:05.055+0000: 16207: debug :
> virEventPollInterruptLocked:726 : Interrupting
> 2018-10-02 05:14:05.055+0000: 16208: debug : virEventPollRunOnce:650 :
> Poll got 1 event(s)
> 2018-10-02 05:14:05.055+0000: 16208: debug :
> virEventPollDispatchTimeouts:432 : Dispatch 1
> 2018-10-02 05:14:05.055+0000: 16208: debug :
> virEventPollDispatchHandles:478 : Dispatch 2
> 2018-10-02 05:14:05.055+0000: 16208: debug :
> virEventPollDispatchHandles:492 : i=0 w=1
> 2018-10-02 05:14:05.055+0000: 16208: info :
> virEventPollDispatchHandles:506 : EVENT_POLL_DISPATCH_HANDLE: watch=1
> events=1
> 2018-10-02 05:14:05.055+0000: 16208: debug :
> virEventPollCleanupTimeouts:525 : Cleanup 1
> 2018-10-02 05:14:05.055+0000: 16208: debug :
> virEventPollCleanupHandles:574 : Cleanup 2
> 2018-10-02 05:14:05.055+0000: 16208: debug : virEventRunDefaultImpl:324 :
> running default event implementation
> 2018-10-02 05:14:05.055+0000: 16208: debug :
> virEventPollCleanupTimeouts:525 : Cleanup 1
> 2018-10-02 05:14:05.055+0000: 16208: debug :
> virEventPollCleanupHandles:574 : Cleanup 2
> 2018-10-02 05:14:05.055+0000: 16208: debug : virEventPollMakePollFDs:401 :
> Prepare n=0 w=1, f=4 e=1 d=0
> 2018-10-02 05:14:05.055+0000: 16208: debug : virEventPollMakePollFDs:401 :
> Prepare n=1 w=2, f=6 e=0 d=0
> 2018-10-02 05:14:05.055+0000: 16208: debug :
> virEventPollCalculateTimeout:338 : Calculate expiry of 1 timers
> 2018-10-02 05:14:05.055+0000: 16208: debug :
> virEventPollCalculateTimeout:371 : No timeout is pending
> 2018-10-02 05:14:05.055+0000: 16208: info : virEventPollRunOnce:640 :
> EVENT_POLL_RUN: nhandles=1 timeout=-1
>
> And here's some information from gbd when its in this state:
>
> [root@host ~]# ps axf | grep libvirtd
> 17010 pts/2    S+     0:00          \_ grep libvirtd
> 15555 ?        Sl     0:00 libvirtd --daemon
> [root@host ~]# gdb -p $(pgrep libvirtd)
>
> (gdb) t a a bt
>
>
> Thread 17 (Thread 0x2ae648a10700 (LWP 15559)):
>
> #0  0x00002ae63d97b68c in pthread_cond_wait@@GLIBC_2.3.2 () from
> /lib64/libpthread.so.0
> #1  0x00002ae63b2c01ba in virCondWait (c=<value optimized out>, m=<value
> optimized out>) at util/virthread.c:154
> #2  0x00002ae63b2c13fb in virThreadPoolWorker (opaque=<value optimized
> out>) at util/virthreadpool.c:124
> #3  0x00002ae63b2c0036 in virThreadHelper (data=<value optimized out>) at
> util/virthread.c:206
> #4  0x00002ae63d977aa1 in start_thread () from /lib64/libpthread.so.0
> #5  0x00002ae63e4d893d in clone () from /lib64/libc.so.6
>
>
> Thread 16 (Thread 0x2ae648c11700 (LWP 15560)):
>
> #0  0x00002ae63d97b68c in pthread_cond_wait@@GLIBC_2.3.2 () from
> /lib64/libpthread.so.0
> #1  0x00002ae63b2c01ba in virCondWait (c=<value optimized out>, m=<value
> optimized out>) at util/virthread.c:154
> #2  0x00002ae63b2c13fb in virThreadPoolWorker (opaque=<value optimized
> out>) at util/virthreadpool.c:124
> #3  0x00002ae63b2c0036 in virThreadHelper (data=<value optimized out>) at
> util/virthread.c:206
> ---Type <return> to continue, or q <return> to quit---
> #4  0x00002ae63d977aa1 in start_thread () from /lib64/libpthread.so.0
>
> #5  0x00002ae63e4d893d in clone () from /lib64/libc.so.6
>
> Thread 15 (Thread 0x2ae648e12700 (LWP 15561)):
> #0  0x00002ae63d97b68c in pthread_cond_wait@@GLIBC_2.3.2 () from
> /lib64/libpthread.so.0
> #1  0x00002ae63b2c01ba in virCondWait (c=<value optimized out>, m=<value
> optimized out>) at util/virthread.c:154
> #2  0x00002ae63b2c13fb in virThreadPoolWorker (opaque=<value optimized
> out>) at util/virthreadpool.c:124
> #3  0x00002ae63b2c0036 in virThreadHelper (data=<value optimized out>) at
> util/virthread.c:206
> #4  0x00002ae63d977aa1 in start_thread () from /lib64/libpthread.so.0
> #5  0x00002ae63e4d893d in clone () from /lib64/libc.so.6
>
> Thread 14 (Thread 0x2ae649013700 (LWP 15562)):
> #0  0x00002ae63d97b68c in pthread_cond_wait@@GLIBC_2.3.2 () from
> /lib64/libpthread.so.0
> #1  0x00002ae63b2c01ba in virCondWait (c=<value optimized out>, m=<value
> optimized out>) at util/virthread.c:154
> ---Type <return> to continue, or q <return> to quit---
> #2  0x00002ae63b2c13fb in virThreadPoolWorker (opaque=<value optimized
> out>) at util/virthreadpool.c:124
> #3  0x00002ae63b2c0036 in virThreadHelper (data=<value optimized out>) at
> util/virthread.c:206
> #4  0x00002ae63d977aa1 in start_thread () from /lib64/libpthread.so.0
> #5  0x00002ae63e4d893d in clone () from /lib64/libc.so.6
>
>
> Thread 13 (Thread 0x2ae649214700 (LWP 15563)):
> #0  0x00002ae63d97b68c in pthread_cond_wait@@GLIBC_2.3.2 () from
> /lib64/libpthread.so.0
> #1  0x00002ae63b2c01ba in virCondWait (c=<value optimized out>, m=<value
> optimized out>) at util/virthread.c:154
> #2  0x00002ae63b2c13fb in virThreadPoolWorker (opaque=<value optimized
> out>) at util/virthreadpool.c:124
> #3  0x00002ae63b2c0036 in virThreadHelper (data=<value optimized out>) at
> util/virthread.c:206
> #4  0x00002ae63d977aa1 in start_thread () from /lib64/libpthread.so.0
>
> #5  0x00002ae63e4d893d in clone () from /lib64/libc.so.6
>
>
> Thread 12 (Thread 0x2ae649415700 (LWP 15564)):
> ---Type <return> to continue, or q <return> to quit---
>
> #0  0x00002ae63d97b68c in pthread_cond_wait@@GLIBC_2.3.2 () from
> /lib64/libpthread.so.0
> #1  0x00002ae63b2c01ba in virCondWait (c=<value optimized out>, m=<value
> optimized out>) at util/virthread.c:154
> #2  0x00002ae63b2c13a8 in virThreadPoolWorker (opaque=<value optimized
> out>) at util/virthreadpool.c:124
> #3  0x00002ae63b2c0036 in virThreadHelper (data=<value optimized out>) at
> util/virthread.c:206
> #4  0x00002ae63d977aa1 in start_thread () from /lib64/libpthread.so.0
> #5  0x00002ae63e4d893d in clone () from /lib64/libc.so.6
>
>
> Thread 11 (Thread 0x2ae649616700 (LWP 15565)):
>
> #0  0x00002ae63d97b68c in pthread_cond_wait@@GLIBC_2.3.2 () from
> /lib64/libpthread.so.0
> #1  0x00002ae63b2c01ba in virCondWait (c=<value optimized out>, m=<value
> optimized out>) at util/virthread.c:154
> #2  0x00002ae63b2c13a8 in virThreadPoolWorker (opaque=<value optimized
> out>) at util/virthreadpool.c:124
> #3  0x00002ae63b2c0036 in virThreadHelper (data=<value optimized out>) at
> util/virthread.c:206
> #4  0x00002ae63d977aa1 in start_thread () from /lib64/libpthread.so.0
> #5  0x00002ae63e4d893d in clone () from /lib64/libc.so.6
>
> ---Type <return> to continue, or q <return> to quit---
>
>
> Thread 10 (Thread 0x2ae649817700 (LWP 15566)):
> #0  0x00002ae63d97b68c in pthread_cond_wait@@GLIBC_2.3.2 () from
> /lib64/libpthread.so.0
> #1  0x00002ae63b2c01ba in virCondWait (c=<value optimized out>, m=<value
> optimized out>) at util/virthread.c:154
> #2  0x00002ae63b2c13a8 in virThreadPoolWorker (opaque=<value optimized
> out>) at util/virthreadpool.c:124
> #3  0x00002ae63b2c0036 in virThreadHelper (data=<value optimized out>) at
> util/virthread.c:206
> #4  0x00002ae63d977aa1 in start_thread () from /lib64/libpthread.so.0
>
> #5  0x00002ae63e4d893d in clone () from /lib64/libc.so.6
>
>
> Thread 9 (Thread 0x2ae649a18700 (LWP 15567)):
> #0  0x00002ae63d97b68c in pthread_cond_wait@@GLIBC_2.3.2 () from
> /lib64/libpthread.so.0
> #1  0x00002ae63b2c01ba in virCondWait (c=<value optimized out>, m=<value
> optimized out>) at util/virthread.c:154
> #2  0x00002ae63b2c13a8 in virThreadPoolWorker (opaque=<value optimized
> out>) at util/virthreadpool.c:124
> #3  0x00002ae63b2c0036 in virThreadHelper (data=<value optimized out>) at
> util/virthread.c:206
> ---Type <return> to continue, or q <return> to quit---
>
> #4  0x00002ae63d977aa1 in start_thread () from /lib64/libpthread.so.0
> #5  0x00002ae63e4d893d in clone () from /lib64/libc.so.6
>
>
> Thread 8 (Thread 0x2ae649c19700 (LWP 15568)):
>
> #0  0x00002ae63d97b68c in pthread_cond_wait@@GLIBC_2.3.2 () from
> /lib64/libpthread.so.0
> #1  0x00002ae63b2c01ba in virCondWait (c=<value optimized out>, m=<value
> optimized out>) at util/virthread.c:154
> #2  0x00002ae63b2c13a8 in virThreadPoolWorker (opaque=<value optimized
> out>) at util/virthreadpool.c:124
> #3  0x00002ae63b2c0036 in virThreadHelper (data=<value optimized out>) at
> util/virthread.c:206
> #4  0x00002ae63d977aa1 in start_thread () from /lib64/libpthread.so.0
> #5  0x00002ae63e4d893d in clone () from /lib64/libc.so.6
>
>
> Thread 7 (Thread 0x2ae64d0aa700 (LWP 15588)):
>
> #0  0x00002ae63d97b68c in pthread_cond_wait@@GLIBC_2.3.2 () from
> /lib64/libpthread.so.0
> #1  0x00002ae63b2c01ba in virCondWait (c=<value optimized out>, m=<value
> optimized out>) at util/virthread.c:154
> ---Type <return> to continue, or q <return> to quit---
> #2  0x00002ae63b2c13fb in virThreadPoolWorker (opaque=<value optimized
> out>) at util/virthreadpool.c:124
> #3  0x00002ae63b2c0036 in virThreadHelper (data=<value optimized out>) at
> util/virthread.c:206
> #4  0x00002ae63d977aa1 in start_thread () from /lib64/libpthread.so.0
>
> #5  0x00002ae63e4d893d in clone () from /lib64/libc.so.6
>
>
> Thread 6 (Thread 0x2ae64d2ab700 (LWP 15589)):
> #0  0x00002ae63d97b68c in pthread_cond_wait@@GLIBC_2.3.2 () from
> /lib64/libpthread.so.0
> #1  0x00002ae63b2c01ba in virCondWait (c=<value optimized out>, m=<value
> optimized out>) at util/virthread.c:154
> #2  0x00002ae63b2c13fb in virThreadPoolWorker (opaque=<value optimized
> out>) at util/virthreadpool.c:124
> #3  0x00002ae63b2c0036 in virThreadHelper (data=<value optimized out>) at
> util/virthread.c:206
> #4  0x00002ae63d977aa1 in start_thread () from /lib64/libpthread.so.0
>
> #5  0x00002ae63e4d893d in clone () from /lib64/libc.so.6
>
>
> Thread 5 (Thread 0x2ae64d4ac700 (LWP 15590)):
> ---Type <return> to continue, or q <return> to quit---
>
> #0  0x00002ae63d97b68c in pthread_cond_wait@@GLIBC_2.3.2 () from
> /lib64/libpthread.so.0
> #1  0x00002ae63b2c01ba in virCondWait (c=<value optimized out>, m=<value
> optimized out>) at util/virthread.c:154
> #2  0x00002ae63b2c13fb in virThreadPoolWorker (opaque=<value optimized
> out>) at util/virthreadpool.c:124
> #3  0x00002ae63b2c0036 in virThreadHelper (data=<value optimized out>) at
> util/virthread.c:206
> #4  0x00002ae63d977aa1 in start_thread () from /lib64/libpthread.so.0
> #5  0x00002ae63e4d893d in clone () from /lib64/libc.so.6
>
>
> Thread 4 (Thread 0x2ae64d6ad700 (LWP 15591)):
>
> #0  0x00002ae63d97b68c in pthread_cond_wait@@GLIBC_2.3.2 () from
> /lib64/libpthread.so.0
> #1  0x00002ae63b2c01ba in virCondWait (c=<value optimized out>, m=<value
> optimized out>) at util/virthread.c:154
> #2  0x00002ae63b2c13fb in virThreadPoolWorker (opaque=<value optimized
> out>) at util/virthreadpool.c:124
> #3  0x00002ae63b2c0036 in virThreadHelper (data=<value optimized out>) at
> util/virthread.c:206
> #4  0x00002ae63d977aa1 in start_thread () from /lib64/libpthread.so.0
> #5  0x00002ae63e4d893d in clone () from /lib64/libc.so.6
>
> ---Type <return> to continue, or q <return> to quit---
>
>
> Thread 3 (Thread 0x2ae64d8ae700 (LWP 15592)):
> #0  0x00002ae63d97b68c in pthread_cond_wait@@GLIBC_2.3.2 () from
> /lib64/libpthread.so.0
> #1  0x00002ae63b2c01ba in virCondWait (c=<value optimized out>, m=<value
> optimized out>) at util/virthread.c:154
> #2  0x00002ae63b2c13fb in virThreadPoolWorker (opaque=<value optimized
> out>) at util/virthreadpool.c:124
> #3  0x00002ae63b2c0036 in virThreadHelper (data=<value optimized out>) at
> util/virthread.c:206
> #4  0x00002ae63d977aa1 in start_thread () from /lib64/libpthread.so.0
> #5  0x00002ae63e4d893d in clone () from /lib64/libc.so.6
>
> Thread 2 (Thread 0x2ae64dec8700 (LWP 15632)):
> #0  0x00002ae63d97ed0d in recvmsg () from /lib64/libpthread.so.0
> #1  0x00002ae63e9caef0 in udev_monitor_receive_device () from
> /lib64/libudev.so.0
> #2  0x00002ae64be26864 in udevEventHandleThread (opaque=<value optimized
> out>) at node_device/node_device_udev.c:1623
> #3  0x00002ae63b2c0075 in virThreadHelper (data=<value optimized out>) at
> util/virthread.c:206
> ---Type <return> to continue, or q <return> to quit---
> #4  0x00002ae63d977aa1 in start_thread () from /lib64/libpthread.so.0
> #5  0x00002ae63e4d893d in clone () from /lib64/libc.so.6
>
> Thread 1 (Thread 0x2ae6429759e0 (LWP 15555)):
> #0  0x00002ae63d97e334 in __lll_lock_wait () from /lib64/libpthread.so.0
> #1  0x00002ae63d9795d8 in _L_lock_854 () from /lib64/libpthread.so.0
> #2  0x00002ae63d9794a7 in pthread_mutex_lock () from /lib64/libpthread.so.0
> #3  0x00002ae64be2364b in udevEventHandleCallback (watch=<value optimized
> out>, fd=19, events=<value optimized out>, data=<value optimized out>) at
> node_device/node_device_udev.c:1666
> #4  0x00002ae63b257564 in virEventPollDispatchHandles () at
> util/vireventpoll.c:508
> #5  virEventPollRunOnce () at util/vireventpoll.c:657
> #6  0x00002ae63b255eb0 in virEventRunDefaultImpl () at util/virevent.c:327
> #7  0x00002ae63b3a338d in virNetDaemonRun (dmn=0x55b1d39818d0) at
> rpc/virnetdaemon.c:858
> #8  0x000055b1d2a4d60b in main (argc=<value optimized out>, argv=<value
> optimized out>) at remote/remote_daemon.c:1475
> (gdb)
>
> This issue I know is fixed in 4.7.0 because I run this version on my
> CentOS 7 machines and don't have this issue. However on my CentOS 6
> machines I have 4.2.0, and do experience this issue. Upgrading to 4.7.0 on
> CentOS 6 is troublesome though, because of the requirement of gnutls >= 3.2.
>
> I'm hoping with the above output someone might be able to point me in the
> right direction to a commit that resolved this between 4.2.0 and 4.7.0, or
> a possible way to prevent this hang in 4.2.0 as described above ?
>
> Thanks in advance
>
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