[libvirt] Call to virDomainIsActive hangs forever

Daniel P. Berrangé berrange at redhat.com
Tue Mar 27 12:45:38 UTC 2018 

On Tue, Mar 27, 2018 at 03:30:14PM +0300, Mathieu Tarral wrote:
> I have installed the following debug symbols:
> 
> - libvirt-daemon-dbgsym_3.0.0-4+deb9u3_amd64.deb
> - libvirt-daemon-system-dbgsym_3.0.0-4+deb9u3_amd64.deb
> - libvirt-clients-dbgsym_3.0.0-4+deb9u3_amd64.deb
> - libvirt0-dbgsym_3.0.0-4+deb9u3_amd64.deb
> - python3-libvirt-dbgsym_3.0.0-2_amd64.deb
> 
> And i was able to reproduce my bug.
> 
> In my Python application, i had 2 threads hanging on a libvirt call.
> (sorry for the verbosity)
> Thread 1:
> 
> (gdb) py-bt
> Traceback (most recent call first):
>   <built-in method virDomainGetState of module object at remote 0x7f508e6b1278>
>   File "/usr/lib/python3/dist-packages/libvirt.py", line 2551, in state
>     ret = libvirtmod.virDomainGetState(self._o, flags)
> 
> (gdb) bt
> pthread_cond_wait@@GLIBC_2.3.2 () at
> ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
> #1  0x00007f508dfe2b86 in virCondWait (c=c at entry=0x55a1fe420728,
> m=m at entry=0x55a1fde4d2c0) at ../../../src/util/virthread.c:154
> #2  0x00007f508e0f5bbb in virNetClientIO (thiscall=0x55a1fe420710,
> client=0x55a1fde4d2b0) at ../../../src/rpc/virnetclient.c:1894
> #3  virNetClientSendInternal (client=client at entry=0x55a1fde4d2b0,
> msg=msg at entry=0x55a1fdd798f0, expectReply=expectReply at entry=true,
> nonBlock=nonBlock at entry=false) at ../../../src/rpc/virnetclient.c:2116
> #4  0x00007f508e0f7443 in virNetClientSendWithReply
> (client=client at entry=0x55a1fde4d2b0, msg=msg at entry=0x55a1fdd798f0) at
> ../../../src/rpc/virnetclient.c:2144
> #5  0x00007f508e0f7bf2 in virNetClientProgramCall
> (prog=prog at entry=0x55a1fdff0f90, client=client at entry=0x55a1fde4d2b0,
> serial=serial at entry=108, proc=proc at entry=212, noutfds=noutfds at entry=0,
> outfds=outfds at entry=0x0, ninfds=0x0,
>     infds=0x0, args_filter=0x7f508e0f13e0
> <xdr_remote_domain_get_state_args>, args=0x7ffd1518cfd0,
> ret_filter=0x7f508e0f1410 <xdr_remote_domain_get_state_ret>,
> ret=0x7ffd1518cfc8) at ../../../src/rpc/virnetclientprogram.c:329
> #6  0x00007f508e0cdeb4 in callFull (priv=priv at entry=0x55a1fe5ac460,
> flags=flags at entry=0, fdin=fdin at entry=0x0, fdinlen=fdinlen at entry=0,
> fdout=fdout at entry=0x0, fdoutlen=fdoutlen at entry=0x0, proc_nr=212,
>     args_filter=0x7f508e0f13e0 <xdr_remote_domain_get_state_args>,
> args=0x7ffd1518cfd0 "`k.\376\241U", ret_filter=0x7f508e0f1410
> <xdr_remote_domain_get_state_ret>, ret=0x7ffd1518cfc8 "",
> conn=<optimized out>)
>     at ../../../src/remote/remote_driver.c:6636
> #7  0x00007f508e0d7f90 in call (conn=<optimized out>,
> ret=0x7ffd1518cfc8 "", ret_filter=<optimized out>, args=0x7ffd1518cfd0
> "`k.\376\241U", args_filter=<optimized out>, proc_nr=212, flags=0,
> priv=0x55a1fe5ac460)
>     at ../../../src/remote/remote_driver.c:6658
> #8  remoteDomainGetState (domain=0x55a1fe212da0, state=0x7ffd1518d0a4,
> reason=0x7ffd1518d0a8, flags=0) at
> ../../../src/remote/remote_driver.c:2458
> #9  0x00007f508e08e248 in virDomainGetState
> (domain=domain at entry=0x55a1fe212da0, state=state at entry=0x7ffd1518d0a4,
> reason=reason at entry=0x7ffd1518d0a8, flags=0) at
> ../../../src/libvirt-domain.c:2495
> #10 0x00007f508e466f28 in libvirt_virDomainGetState (self=<optimized
> out>, args=<optimized out>) at libvirt-override.c:2539
> #11 0x000055a1fb4cb6df in PyCFunction_Call () at ../Objects/methodobject.c:109


That's pretty much as expected - just remote client waiting for a reply
from the daemon.

> And Thread 2:
> 
> (gdb) py-bt
>   <built-in method virDomainIsActive of module object at remote 0x7f508e6b1278>
>   File "/usr/lib/python3/dist-packages/libvirt.py", line 1340, in isActive
>     ret = libvirtmod.virDomainIsActive(self._o)
> 
> (gdb) bt

Are you sure this isa  different thread ? It looks identical to the first
stack trace you give above.

> #0  pthread_cond_wait@@GLIBC_2.3.2 () at
> ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
> #1  0x00007f508dfe2b86 in virCondWait (c=c at entry=0x7f4ff051fdc8,
> m=m at entry=0x55a1fde4d2c0) at ../../../src/util/virthread.c:154
> #2  0x00007f508e0f5bbb in virNetClientIO (thiscall=0x7f4ff051fdb0,
> client=0x55a1fde4d2b0) at ../../../src/rpc/virnetclient.c:1894
> #3  virNetClientSendInternal (client=client at entry=0x55a1fde4d2b0,
> msg=msg at entry=0x7f4ff051fa10, expectReply=expectReply at entry=true,
> nonBlock=nonBlock at entry=false) at ../../../src/rpc/virnetclient.c:2116
> #4  0x00007f508e0f7443 in virNetClientSendWithReply
> (client=client at entry=0x55a1fde4d2b0, msg=msg at entry=0x7f4ff051fa10) at
> ../../../src/rpc/virnetclient.c:2144
> #5  0x00007f508e0f7bf2 in virNetClientProgramCall
> (prog=prog at entry=0x55a1fdff0f90, client=client at entry=0x55a1fde4d2b0,
> serial=serial at entry=107, proc=proc at entry=150, noutfds=noutfds at entry=0,
> outfds=outfds at entry=0x0, ninfds=0x0,
>     infds=0x0, args_filter=0x7f508e0efe70
> <xdr_remote_domain_is_active_args>, args=0x7f4fff7fd040,
> ret_filter=0x7f508e0efe90 <xdr_remote_domain_is_active_ret>,
> ret=0x7f4fff7fd03c) at ../../../src/rpc/virnetclientprogram.c:329
> #6  0x00007f508e0cdeb4 in callFull (priv=priv at entry=0x55a1fe5ac460,
> flags=flags at entry=0, fdin=fdin at entry=0x0, fdinlen=fdinlen at entry=0,
> fdout=fdout at entry=0x0, fdoutlen=fdoutlen at entry=0x0, proc_nr=150,
>     args_filter=0x7f508e0efe70 <xdr_remote_domain_is_active_args>,
> args=0x7f4fff7fd040 "`k.\376\241U", ret_filter=0x7f508e0efe90
> <xdr_remote_domain_is_active_ret>, ret=0x7f4fff7fd03c "",
> conn=<optimized out>)
>     at ../../../src/remote/remote_driver.c:6636
> #7  0x00007f508e0d71cb in call (conn=<optimized out>,
> ret=0x7f4fff7fd03c "", ret_filter=<optimized out>, args=0x7f4fff7fd040
> "`k.\376\241U", args_filter=<optimized out>, proc_nr=150, flags=0,
> priv=0x55a1fe5ac460)
>     at ../../../src/remote/remote_driver.c:6658
> #8  remoteDomainIsActive (dom=0x55a1fe212da0) at
> ../../../src/remote/remote_client_bodies.h:2842
> #9  0x00007f508e09df03 in virDomainIsActive
> (dom=dom at entry=0x55a1fe212da0) at ../../../src/libvirt-domain.c:8467
> #10 0x00007f508e46cbd0 in libvirt_virDomainIsActive (self=<optimized
> out>, args=<optimized out>) at build/libvirt.c:1288
> #11 0x000055a1fb4cb6df in PyCFunction_Call () at ../Objects/methodobject.c:109


Interesting. This is an identical stack trace - so we have 2 python
threads both calling virDomainIsActive(). Nothing wrong with that
per-se - we support multithreaded usage like this.

Curious why it would break.

Can you confirm there are no other threads running libvirt code
in your python app ?  Did you have any thread running the libvirt
event loop perhaps ?

> So i ran GDB on /usr/sbin/libvirtd to know what was happening:
> 
> (gdb) thread all apply bt
> Thread 17 (Thread 0x7f241dd40700 (LWP 5100)):
> #0  pthread_cond_wait@@GLIBC_2.3.2 () at
> ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
> #1  0x00007f2448240b86 in virCondWait (c=c at entry=0x7f24183eeba8,
> m=m at entry=0x7f24183eeb80) at ../../../src/util/virthread.c:154
> #2  0x00007f24482416d3 in virThreadPoolWorker
> (opaque=opaque at entry=0x55705071a350) at
> ../../../src/util/virthreadpool.c:124
> #3  0x00007f2448240928 in virThreadHelper (data=<optimized out>) at
> ../../../src/util/virthread.c:206
> #4  0x00007f2444b1a494 in start_thread (arg=0x7f241dd40700) at
> pthread_create.c:333
> #5  0x00007f244485cacf in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
> 
> Thread 16 (Thread 0x7f241fdfd700 (LWP 3518)):
> #0  pthread_cond_wait@@GLIBC_2.3.2 () at
> ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
> #1  0x00007f2448240b86 in virCondWait (c=c at entry=0x55705073e728,
> m=m at entry=0x55705073e700) at ../../../src/util/virthread.c:154
> #2  0x00007f24482416d3 in virThreadPoolWorker
> (opaque=opaque at entry=0x55705073e4b0) at
> ../../../src/util/virthreadpool.c:124
> #3  0x00007f2448240928 in virThreadHelper (data=<optimized out>) at
> ../../../src/util/virthread.c:206
> #4  0x00007f2444b1a494 in start_thread (arg=0x7f241fdfd700) at
> pthread_create.c:333
> #5  0x00007f244485cacf in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
> 
> Thread 15 (Thread 0x7f24205fe700 (LWP 3517)):
> #0  pthread_cond_wait@@GLIBC_2.3.2 () at
> ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
> #1  0x00007f2448240b86 in virCondWait (c=c at entry=0x55705073e728,
> m=m at entry=0x55705073e700) at ../../../src/util/virthread.c:154
> #2  0x00007f24482416d3 in virThreadPoolWorker
> (opaque=opaque at entry=0x55705071e310) at
> ../../../src/util/virthreadpool.c:124
> #3  0x00007f2448240928 in virThreadHelper (data=<optimized out>) at
> ../../../src/util/virthread.c:206
> #4  0x00007f2444b1a494 in start_thread (arg=0x7f24205fe700) at
> pthread_create.c:333
> #5  0x00007f244485cacf in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
> 
> Thread 14 (Thread 0x7f2420dff700 (LWP 3516)):
> #0  pthread_cond_wait@@GLIBC_2.3.2 () at
> ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
> #1  0x00007f2448240b86 in virCondWait (c=c at entry=0x55705073e728,
> m=m at entry=0x55705073e700) at ../../../src/util/virthread.c:154
> #2  0x00007f24482416d3 in virThreadPoolWorker
> (opaque=opaque at entry=0x55705073e4b0) at
> ../../../src/util/virthreadpool.c:124
> #3  0x00007f2448240928 in virThreadHelper (data=<optimized out>) at
> ../../../src/util/virthread.c:206
> #4  0x00007f2444b1a494 in start_thread (arg=0x7f2420dff700) at
> pthread_create.c:333
> #5  0x00007f244485cacf in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
> 
> Thread 13 (Thread 0x7f2421600700 (LWP 3515)):
> #0  pthread_cond_wait@@GLIBC_2.3.2 () at
> ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
> #1  0x00007f2448240b86 in virCondWait (c=c at entry=0x55705073e728,
> m=m at entry=0x55705073e700) at ../../../src/util/virthread.c:154
> #2  0x00007f24482416d3 in virThreadPoolWorker
> (opaque=opaque at entry=0x55705071e250) at
> ../../../src/util/virthreadpool.c:124
> #3  0x00007f2448240928 in virThreadHelper (data=<optimized out>) at
> ../../../src/util/virthread.c:206
> #4  0x00007f2444b1a494 in start_thread (arg=0x7f2421600700) at
> pthread_create.c:333
> #5  0x00007f244485cacf in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
> 
> Thread 12 (Thread 0x7f2421e01700 (LWP 3514)):
> #0  pthread_cond_wait@@GLIBC_2.3.2 () at
> ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
> #1  0x00007f2448240b86 in virCondWait (c=c at entry=0x55705073e728,
> m=m at entry=0x55705073e700) at ../../../src/util/virthread.c:154
> #2  0x00007f24482416d3 in virThreadPoolWorker
> (opaque=opaque at entry=0x55705073e4b0) at
> ../../../src/util/virthreadpool.c:124
> #3  0x00007f2448240928 in virThreadHelper (data=<optimized out>) at
> ../../../src/util/virthread.c:206
> #4  0x00007f2444b1a494 in start_thread (arg=0x7f2421e01700) at
> pthread_create.c:333
> #5  0x00007f244485cacf in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
> 
> Thread 11 (Thread 0x7f2439e14700 (LWP 3513)):
> #0  pthread_cond_wait@@GLIBC_2.3.2 () at
> ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
> #1  0x00007f2448240b86 in virCondWait (c=c at entry=0x557050729358,
> m=m at entry=0x557050729290) at ../../../src/util/virthread.c:154
> #2  0x00007f2448241694 in virThreadPoolWorker
> (opaque=opaque at entry=0x55705071b8d0) at
> ../../../src/util/virthreadpool.c:124
> #3  0x00007f2448240928 in virThreadHelper (data=<optimized out>) at
> ../../../src/util/virthread.c:206
> #4  0x00007f2444b1a494 in start_thread (arg=0x7f2439e14700) at
> pthread_create.c:333
> #5  0x00007f244485cacf in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
> 
> Thread 10 (Thread 0x7f243a615700 (LWP 3512)):
> #0  pthread_cond_wait@@GLIBC_2.3.2 () at
> ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
> #1  0x00007f2448240b86 in virCondWait (c=c at entry=0x557050729358,
> m=m at entry=0x557050729290) at ../../../src/util/virthread.c:154
> #2  0x00007f2448241694 in virThreadPoolWorker
> (opaque=opaque at entry=0x55705071bb10) at
> ../../../src/util/virthreadpool.c:124
> #3  0x00007f2448240928 in virThreadHelper (data=<optimized out>) at
> ../../../src/util/virthread.c:206
> #4  0x00007f2444b1a494 in start_thread (arg=0x7f243a615700) at
> pthread_create.c:333
> #5  0x00007f244485cacf in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
> 
> Thread 9 (Thread 0x7f243ae16700 (LWP 3511)):
> #0  pthread_cond_wait@@GLIBC_2.3.2 () at
> ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
> #1  0x00007f2448240b86 in virCondWait (c=c at entry=0x557050729358,
> m=m at entry=0x557050729290) at ../../../src/util/virthread.c:154
> #2  0x00007f2448241694 in virThreadPoolWorker
> (opaque=opaque at entry=0x55705071b810) at
> ../../../src/util/virthreadpool.c:124
> #3  0x00007f2448240928 in virThreadHelper (data=<optimized out>) at
> ../../../src/util/virthread.c:206
> #4  0x00007f2444b1a494 in start_thread (arg=0x7f243ae16700) at
> pthread_create.c:333
> #5  0x00007f244485cacf in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
> 
> Thread 8 (Thread 0x7f243b617700 (LWP 3510)):
> #0  pthread_cond_wait@@GLIBC_2.3.2 () at
> ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
> #1  0x00007f2448240b86 in virCondWait (c=c at entry=0x557050729358,
> m=m at entry=0x557050729290) at ../../../src/util/virthread.c:154
> #2  0x00007f2448241694 in virThreadPoolWorker
> (opaque=opaque at entry=0x55705071b8d0) at
> ../../../src/util/virthreadpool.c:124
> #3  0x00007f2448240928 in virThreadHelper (data=<optimized out>) at
> ../../../src/util/virthread.c:206
> #4  0x00007f2444b1a494 in start_thread (arg=0x7f243b617700) at
> pthread_create.c:333
> #5  0x00007f244485cacf in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
> 
> Thread 7 (Thread 0x7f243be18700 (LWP 3509)):
> #0  pthread_cond_wait@@GLIBC_2.3.2 () at
> ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
> #1  0x00007f2448240b86 in virCondWait (c=c at entry=0x557050729358,
> m=m at entry=0x557050729290) at ../../../src/util/virthread.c:154
> #2  0x00007f2448241694 in virThreadPoolWorker
> (opaque=opaque at entry=0x55705071bb10) at
> ../../../src/util/virthreadpool.c:124
> #3  0x00007f2448240928 in virThreadHelper (data=<optimized out>) at
> ../../../src/util/virthread.c:206
> #4  0x00007f2444b1a494 in start_thread (arg=0x7f243be18700) at
> pthread_create.c:333
> #5  0x00007f244485cacf in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
> 
> Thread 6 (Thread 0x7f243c619700 (LWP 3508)):
> #0  pthread_cond_wait@@GLIBC_2.3.2 () at
> ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
> #1  0x00007f2448240b86 in virCondWait (c=c at entry=0x5570507292b8,
> m=m at entry=0x557050729290) at ../../../src/util/virthread.c:154
> #2  0x00007f24482416d3 in virThreadPoolWorker
> (opaque=opaque at entry=0x55705071b810) at
> ../../../src/util/virthreadpool.c:124
> #3  0x00007f2448240928 in virThreadHelper (data=<optimized out>) at
> ../../../src/util/virthread.c:206
> #4  0x00007f2444b1a494 in start_thread (arg=0x7f243c619700) at
> pthread_create.c:333
> #5  0x00007f244485cacf in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
> 
> Thread 5 (Thread 0x7f243ce1a700 (LWP 3507)):
> #0  pthread_cond_wait@@GLIBC_2.3.2 () at
> ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
> #1  0x00007f2448240b86 in virCondWait (c=c at entry=0x5570507292b8,
> m=m at entry=0x557050729290) at ../../../src/util/virthread.c:154
> #2  0x00007f24482416d3 in virThreadPoolWorker
> (opaque=opaque at entry=0x55705071b8d0) at
> ../../../src/util/virthreadpool.c:124
> #3  0x00007f2448240928 in virThreadHelper (data=<optimized out>) at
> ../../../src/util/virthread.c:206
> #4  0x00007f2444b1a494 in start_thread (arg=0x7f243ce1a700) at
> pthread_create.c:333
> #5  0x00007f244485cacf in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
> 
> Thread 4 (Thread 0x7f243d61b700 (LWP 3506)):
> #0  pthread_cond_wait@@GLIBC_2.3.2 () at
> ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
> #1  0x00007f2448240b86 in virCondWait (c=c at entry=0x5570507292b8,
> m=m at entry=0x557050729290) at ../../../src/util/virthread.c:154
> #2  0x00007f24482416d3 in virThreadPoolWorker
> (opaque=opaque at entry=0x55705071b990) at
> ../../../src/util/virthreadpool.c:124
> #3  0x00007f2448240928 in virThreadHelper (data=<optimized out>) at
> ../../../src/util/virthread.c:206
> #4  0x00007f2444b1a494 in start_thread (arg=0x7f243d61b700) at
> pthread_create.c:333
> #5  0x00007f244485cacf in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
> 
> Thread 3 (Thread 0x7f243de1c700 (LWP 3505)):
> #0  pthread_cond_wait@@GLIBC_2.3.2 () at
> ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
> #1  0x00007f2448240b86 in virCondWait (c=c at entry=0x5570507292b8,
> m=m at entry=0x557050729290) at ../../../src/util/virthread.c:154
> #2  0x00007f24482416d3 in virThreadPoolWorker
> (opaque=opaque at entry=0x55705071ba50) at
> ../../../src/util/virthreadpool.c:124
> #3  0x00007f2448240928 in virThreadHelper (data=<optimized out>) at
> ../../../src/util/virthread.c:206
> #4  0x00007f2444b1a494 in start_thread (arg=0x7f243de1c700) at
> pthread_create.c:333
> #5  0x00007f244485cacf in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
> 
> Thread 2 (Thread 0x7f243e61d700 (LWP 3504)):
> #0  pthread_cond_wait@@GLIBC_2.3.2 () at
> ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
> #1  0x00007f2448240b86 in virCondWait (c=c at entry=0x5570507292b8,
> m=m at entry=0x557050729290) at ../../../src/util/virthread.c:154
> #2  0x00007f24482416d3 in virThreadPoolWorker
> (opaque=opaque at entry=0x55705071bb10) at
> ../../../src/util/virthreadpool.c:124
> #3  0x00007f2448240928 in virThreadHelper (data=<optimized out>) at
> ../../../src/util/virthread.c:206
> #4  0x00007f2444b1a494 in start_thread (arg=0x7f243e61d700) at
> pthread_create.c:333
> #5  0x00007f244485cacf in clone () at
> ../sysdeps/unix/sysv/linux/x86_64/clone.S:97
> 
> Thread 1 (Thread 0x7f24489f3940 (LWP 3502)):
> #0  0x00007f244485367d in poll () at ../sysdeps/unix/syscall-template.S:84
> #1  0x00007f24481f304f in poll (__timeout=-1, __nfds=50,
> __fds=<optimized out>) at
> /usr/include/x86_64-linux-gnu/bits/poll2.h:46
> #2  virEventPollRunOnce () at ../../../src/util/vireventpoll.c:641
> #3  0x00007f24481f1c21 in virEventRunDefaultImpl () at
> ../../../src/util/virevent.c:314
> #4  0x00007f244835837d in virNetDaemonRun (dmn=0x55705072a330) at
> ../../../src/rpc/virnetdaemon.c:818
> #5  0x000055704f773b87 in main (argc=<optimized out>, argv=<optimized
> out>) at ../../../daemon/libvirtd.c:1547
> 
> 
> But this doesn't really help me understand why it hangs,
> or which threads is processing the client requests that are hanging.

This shows that libvirtd is entirely idle. Thread 1 is the event loop
and waiting for I/O. All the other threads are API workers waiting for
any API call to process.  So all completely normal.


Regards,
Daniel
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