Libvirtd termination can crash. One can use [2] patch to trigger it. Call
domstats function and send TERM to libvirtd. You'd probably see stacktrace [1].
The problem is that threads with clients requests are joined after drivers
cleanup. This patch series address this issue.
[1] Crash stacktrace
Program received signal SIGSEGV, Segmentation fault.
Thread 5 (Thread 0x7fffe6a4d700 (LWP 921916)):
#0 0x00007fffd9cb3f14 in qemuDomainObjBeginJobInternal (driver=driver@entry=0x7fffcc103e40,
obj=obj@entry=0x7fffcc1a6ca0, job=job@entry=QEMU_JOB_QUERY, asyncJob=asyncJob@entry=QEMU_ASYNC_JOB_NONE)
at qemu/qemu_domain.c:4114
#1 0x00007fffd9cb82ab in qemuDomainObjBeginJob (driver=driver@entry=0x7fffcc103e40, obj=obj@entry=0x7fffcc1a6ca0,
job=job@entry=QEMU_JOB_QUERY) at qemu/qemu_domain.c:4240
#2 0x00007fffd9d23094 in qemuConnectGetAllDomainStats (conn=0x7fffcc1bc140, doms=<optimized out>,
ndoms=<optimized out>, stats=127, retStats=0x7fffe6a4cb10, flags=<optimized out>) at qemu/qemu_driver.c:20116
#3 0x00007ffff744a166 in virDomainListGetStats (doms=0x7fffa8000a10, stats=0,
retStats=retStats@entry=0x7fffe6a4cb10, flags=0) at libvirt-domain.c:11592
#4 0x000055555557af15 in remoteDispatchConnectGetAllDomainStats (server=<optimized out>, msg=<optimized out>,
ret=0x7fffa80008e0, args=0x7fffa80008c0, rerr=0x7fffe6a4cc50, client=<optimized out>) at remote.c:6532
#5 remoteDispatchConnectGetAllDomainStatsHelper (server=<optimized out>, client=<optimized out>,
msg=<optimized out>, rerr=0x7fffe6a4cc50, args=0x7fffa80008c0, ret=0x7fffa80008e0) at remote_dispatch.h:615
#6 0x00007ffff74abba2 in virNetServerProgramDispatchCall (msg=0x55555583bf50, client=0x55555583c580,
server=0x555555810f40, prog=0x55555583a140) at rpc/virnetserverprogram.c:437
#7 virNetServerProgramDispatch (prog=0x55555583a140, server=server@entry=0x555555810f40, client=0x55555583c580,
msg=0x55555583bf50) at rpc/virnetserverprogram.c:307
#8 0x00005555555ae10d in virNetServerProcessMsg (msg=<optimized out>, prog=<optimized out>, client=<optimized out>,
srv=0x555555810f40) at rpc/virnetserver.c:148
#9 virNetServerHandleJob (jobOpaque=<optimized out>, opaque=0x555555810f40) at rpc/virnetserver.c:169
#10 0x00007ffff7390fd1 in virThreadPoolWorker (opaque=opaque@entry=0x5555558057a0) at util/virthreadpool.c:167
#11 0x00007ffff7390358 in virThreadHelper (data=<optimized out>) at util/virthread.c:206
#12 0x00007ffff457be25 in start_thread () from /lib64/libpthread.so.0
#13 0x00007ffff42a934d in clone () from /lib64/libc.so.6
Thread 1 (Thread 0x7ffff7fae880 (LWP 921909)):
#0 0x00007ffff457f945 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1 0x00007ffff73905c6 in virCondWait (c=<optimized out>, m=<optimized out>) at util/virthread.c:154
#2 0x00007ffff73911e0 in virThreadPoolFree (pool=0x555555811030) at util/virthreadpool.c:290
#3 0x00005555555adb44 in virNetServerDispose (obj=0x555555810f40) at rpc/virnetserver.c:767
#4 0x00007ffff736f62b in virObjectUnref (anyobj=<optimized out>) at util/virobject.c:356
#5 0x00007ffff7343e19 in virHashFree (table=0x55555581ba40) at util/virhash.c:318
#6 0x00007ffff74a46b5 in virNetDaemonDispose (obj=0x555555812c50) at rpc/virnetdaemon.c:105
#7 0x00007ffff736f62b in virObjectUnref (anyobj=anyobj@entry=0x555555812c50) at util/virobject.c:356
#8 0x0000555555570479 in main (argc=<optimized out>, argv=<optimized out>) at libvirtd.c:1539
[2] patch to trigger crash
# diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
# index cf5e4ad..39a57aa 100644
# --- a/src/qemu/qemu_driver.c
# +++ b/src/qemu/qemu_driver.c
# @@ -20144,6 +20144,8 @@ qemuConnectGetAllDomainStats(virConnectPtr conn,
# domflags = 0;
# vm = vms[i];
#
# + sleep(5);
# +
# virObjectLock(vm);
#
# if (HAVE_JOB(privflags) &&
Nikolay Shirokovskiy (3):
daemon: finish threads on close
qemu: monitor: check monitor not closed on send
qemu: implement state driver shutdown function
daemon/libvirtd.c | 2 ++
src/driver-state.h | 4 ++++
src/libvirt.c | 18 ++++++++++++++++++
src/libvirt_internal.h | 1 +
src/libvirt_private.syms | 1 +
src/qemu/qemu_driver.c | 39 +++++++++++++++++++++++++++++++++++++++
src/qemu/qemu_monitor.c | 27 +++++++++++++--------------
src/rpc/virnetserver.c | 5 +++--
8 files changed, 81 insertions(+), 16 deletions(-)
--
1.8.3.1
--
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