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@entry=0x55a1fe420728, m=m@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@entry=0x55a1fde4d2b0, msg=msg@entry=0x55a1fdd798f0, expectReply=expectReply@entry=true, nonBlock=nonBlock@entry=false) at ../../../src/rpc/virnetclient.c:2116 #4 0x00007f508e0f7443 in virNetClientSendWithReply (client=client@entry=0x55a1fde4d2b0, msg=msg@entry=0x55a1fdd798f0) at ../../../src/rpc/virnetclient.c:2144 #5 0x00007f508e0f7bf2 in virNetClientProgramCall (prog=prog@entry=0x55a1fdff0f90, client=client@entry=0x55a1fde4d2b0, serial=serial@entry=108, proc=proc@entry=212, noutfds=noutfds@entry=0, outfds=outfds@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@entry=0x55a1fe5ac460, flags=flags@entry=0, fdin=fdin@entry=0x0, fdinlen=fdinlen@entry=0, fdout=fdout@entry=0x0, fdoutlen=fdoutlen@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@entry=0x55a1fe212da0, state=state@entry=0x7ffd1518d0a4, reason=reason@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 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 #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@entry=0x7f4ff051fdc8, m=m@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@entry=0x55a1fde4d2b0, msg=msg@entry=0x7f4ff051fa10, expectReply=expectReply@entry=true, nonBlock=nonBlock@entry=false) at ../../../src/rpc/virnetclient.c:2116 #4 0x00007f508e0f7443 in virNetClientSendWithReply (client=client@entry=0x55a1fde4d2b0, msg=msg@entry=0x7f4ff051fa10) at ../../../src/rpc/virnetclient.c:2144 #5 0x00007f508e0f7bf2 in virNetClientProgramCall (prog=prog@entry=0x55a1fdff0f90, client=client@entry=0x55a1fde4d2b0, serial=serial@entry=107, proc=proc@entry=150, noutfds=noutfds@entry=0, outfds=outfds@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@entry=0x55a1fe5ac460, flags=flags@entry=0, fdin=fdin@entry=0x0, fdinlen=fdinlen@entry=0, fdout=fdout@entry=0x0, fdoutlen=fdoutlen@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@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 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@entry=0x7f24183eeba8, m=m@entry=0x7f24183eeb80) at ../../../src/util/virthread.c:154 #2 0x00007f24482416d3 in virThreadPoolWorker (opaque=opaque@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@entry=0x55705073e728, m=m@entry=0x55705073e700) at ../../../src/util/virthread.c:154 #2 0x00007f24482416d3 in virThreadPoolWorker (opaque=opaque@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@entry=0x55705073e728, m=m@entry=0x55705073e700) at ../../../src/util/virthread.c:154 #2 0x00007f24482416d3 in virThreadPoolWorker (opaque=opaque@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@entry=0x55705073e728, m=m@entry=0x55705073e700) at ../../../src/util/virthread.c:154 #2 0x00007f24482416d3 in virThreadPoolWorker (opaque=opaque@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@entry=0x55705073e728, m=m@entry=0x55705073e700) at ../../../src/util/virthread.c:154 #2 0x00007f24482416d3 in virThreadPoolWorker (opaque=opaque@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@entry=0x55705073e728, m=m@entry=0x55705073e700) at ../../../src/util/virthread.c:154 #2 0x00007f24482416d3 in virThreadPoolWorker (opaque=opaque@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@entry=0x557050729358, m=m@entry=0x557050729290) at ../../../src/util/virthread.c:154 #2 0x00007f2448241694 in virThreadPoolWorker (opaque=opaque@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@entry=0x557050729358, m=m@entry=0x557050729290) at ../../../src/util/virthread.c:154 #2 0x00007f2448241694 in virThreadPoolWorker (opaque=opaque@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@entry=0x557050729358, m=m@entry=0x557050729290) at ../../../src/util/virthread.c:154 #2 0x00007f2448241694 in virThreadPoolWorker (opaque=opaque@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@entry=0x557050729358, m=m@entry=0x557050729290) at ../../../src/util/virthread.c:154 #2 0x00007f2448241694 in virThreadPoolWorker (opaque=opaque@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@entry=0x557050729358, m=m@entry=0x557050729290) at ../../../src/util/virthread.c:154 #2 0x00007f2448241694 in virThreadPoolWorker (opaque=opaque@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@entry=0x5570507292b8, m=m@entry=0x557050729290) at ../../../src/util/virthread.c:154 #2 0x00007f24482416d3 in virThreadPoolWorker (opaque=opaque@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@entry=0x5570507292b8, m=m@entry=0x557050729290) at ../../../src/util/virthread.c:154 #2 0x00007f24482416d3 in virThreadPoolWorker (opaque=opaque@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@entry=0x5570507292b8, m=m@entry=0x557050729290) at ../../../src/util/virthread.c:154 #2 0x00007f24482416d3 in virThreadPoolWorker (opaque=opaque@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@entry=0x5570507292b8, m=m@entry=0x557050729290) at ../../../src/util/virthread.c:154 #2 0x00007f24482416d3 in virThreadPoolWorker (opaque=opaque@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@entry=0x5570507292b8, m=m@entry=0x557050729290) at ../../../src/util/virthread.c:154 #2 0x00007f24482416d3 in virThreadPoolWorker (opaque=opaque@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. Does this information provides you any help ? If i should run other commands, please, let me know, libvirt will be hanging forever. Best regards, 2018-03-26 13:16 GMT+03:00 Daniel P. Berrangé <berrange@redhat.com>:
On Fri, Mar 23, 2018 at 01:24:46PM +0100, Erik Skultety wrote:
On Thu, Mar 22, 2018 at 06:10:49PM +0200, Mathieu Tarral wrote:
Hi !
I'm submitting my messages on this mailing list to request a bit of help on a case that I have where a Python application makes a call to virDomainIsActive, and the call never returns.
I have tried to investigate, but as there are no debug symbols for libvirt on Debian Stretch, i can only have the following GDB backtrace:
(gdb) bt #0 pthread_cond_wait@@GLIBC_2.3.2 () at ../sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185 #1 0x00007f49026f5b76 in virCondWait () from /usr/lib/libvirt.so.0 #2 0x00007f4902808bab in ?? () from /usr/lib/libvirt.so.0 #3 0x00007f490280a433 in virNetClientSendWithReply () from /usr/lib/libvirt.so.0 #4 0x00007f490280abe2 in virNetClientProgramCall () from /usr/lib/libvirt.so.0 #5 0x00007f49027e0ea4 in ?? () from /usr/lib/libvirt.so.0 #6 0x00007f49027ea1bb in ?? () from /usr/lib/libvirt.so.0 #7 0x00007f49027b0ef3 in virDomainIsActive () from /usr/lib/libvirt.so.0 #8 0x00007f4902b7fbd0 in libvirt_virDomainIsActive () from /usr/lib/python3/dist-packages/libvirtmod.cpython-35m-x86_64-linux-gnu.so #9 0x0000558eeec696df in PyCFunction_Call () at ../Objects/methodobject.c:109
The libvirt driver used is QEMU, and i have a specific monitoring in place using virtual machine introspection: https://github.com/KVM-VMI/kvm-vmi
Now this specific monitoring somehow triggers this bug, and at this point, i don't know if it's a corner case in the libvirt QEMU driver or not. That's why i would like to have your lights on this.
libvirt version: 3.0.0-4
-> Could you tell me where i should look in the code ?
You're probably looking at virLogManagerDomain* methods located in src/logging/log_manager.c and the wait call is issued from virNetClientIO.
-> Do you have more information about this virCondWait ? Which condition is it waiting for ? -> How can i get the symbols without having the recompile libvirt and install it system wide, erasing the binaries installed by the package ?
To be honest, I think it's always worth debugging a custom built binary from sources, since the debug symbols shipped via distro package are most likely generated with optimizations which makes any kind of interactive debugging painful. The problem is that you're going to built v3.0.0 tag on a new distro, since new GCCs will complain about a lot of stuff, I looked at the code, tried a few things, but honestly I didn't see a path where you could get to virNetClientProgrammCall from virDomainIsActive (since I don't know what the original call was), so unless you post a full backtrace, we can't help you much here.
That's easy - virDomainIsActive() calls into the driver APIs. This is client side trace, so will get into the remote driver client, which will then call virNetClientProgramCall.
Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
-- Mathieu Tarral