Build libvirt from git (ccf7567329f).
Using the libvirt ‘run’ script, run something like
libguestfs-test-tool. I think basically any command which runs a
guest will do. NB These commands are all run as NON-root:
killall libvirtd lt-libvirtd virtlogd lt-virtlogd
./build/run libguestfs-test-tool
Now there will be a lt-virtlogd process using 100% of CPU:
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2572972 rjones 20 0 47880 16256 14516 R 100.0 0.1 0:19.27 lt-virt+
$ ls /proc/2572972/fd -l
total 0
lrwx------. 1 rjones rjones 64 Feb 17 17:45 0 -> /dev/null
lrwx------. 1 rjones rjones 64 Feb 17 17:45 1 -> /dev/null
lr-x------. 1 rjones rjones 64 Feb 17 17:45 11 -> /var/lib/sss/mc/passwd
lr-x------. 1 rjones rjones 64 Feb 17 17:45 12 -> /var/lib/sss/mc/group
lrwx------. 1 rjones rjones 64 Feb 17 17:45 13 -> 'socket:[48299994]'
lr-x------. 1 rjones rjones 64 Feb 17 17:45 14 -> 'pipe:[48299995]'
l-wx------. 1 rjones rjones 64 Feb 17 17:45 16 -> /home/rjones/.cache/libvirt/qemu/log/guestfs-xllxycje1blj4nmd.log
l-wx------. 1 rjones rjones 64 Feb 17 17:45 17 -> /run/systemd/inhibit/1620.ref
lrwx------. 1 rjones rjones 64 Feb 17 17:45 2 -> /dev/null
lrwx------. 1 rjones rjones 64 Feb 17 17:45 3 -> 'socket:[48299981]'
l-wx------. 1 rjones rjones 64 Feb 17 17:45 4 -> /run/user/1000/libvirt/virtlogd.pid
lrwx------. 1 rjones rjones 64 Feb 17 17:45 5 -> 'socket:[48299984]'
lrwx------. 1 rjones rjones 64 Feb 17 17:45 6 -> 'socket:[48299986]'
lr-x------. 1 rjones rjones 64 Feb 17 17:45 7 -> 'pipe:[48299988]'
l-wx------. 1 rjones rjones 64 Feb 17 17:45 8 -> 'pipe:[48299988]'
lrwx------. 1 rjones rjones 64 Feb 17 17:45 9 -> 'anon_inode:[eventfd]'
$ ls -ltr /home/rjones/.cache/libvirt/qemu/log/guestfs-xllxycje1blj4nmd.log
-rw-------. 1 rjones rjones 4003 Feb 17 17:44 /home/rjones/.cache/libvirt/qemu/log/guestfs-xllxycje1blj4nmd.log
Only one thread running with this stack trace:
Thread 1 (Thread 0x7fa51f219b40 (LWP 2572972)):
#0 virObjectGetLockableObj (anyobj=0x55fb2896c200) at ../../src/util/virobject.c:393
#1 virObjectLock (anyobj=0x55fb2896c200) at ../../src/util/virobject.c:427
#2 0x00007fa520fda48f in virNetServerHasClients (srv=0x55fb2896c200) at ../../src/rpc/virnetserver.c:966
#3 0x00007fa520fd7b69 in daemonServerHasClients (payload=<optimized out>, key=<optimized out>, opaque=0x7ffc8adb5a47) at ../../src/rpc/virnetdaemon.c:916
#4 0x00007fa520ea7140 in virHashForEach (data=<optimized out>, iter=<optimized out>, table=<optimized out>) at ../../src/util/virhash.c:639
#5 virHashForEach (table=0x55fb289571a0, iter=iter@entry=0x7fa520fd7b60 <daemonServerHasClients>, data=data@entry=0x7ffc8adb5a47) at ../../src/util/virhash.c:627
#6 0x00007fa520fd89ee in virNetDaemonHasClients (dmn=<optimized out>) at ../../src/rpc/virnetdaemon.c:927
#7 0x00007fa520fd8aa5 in virNetDaemonRun (dmn=0x55fb28957110) at ../../src/rpc/virnetdaemon.c:842
#8 0x000055fb27b5c8e9 in main (argc=<optimized out>, argv=0x7ffc8adb6188) at ../../src/logging/log_daemon.c:1153
pstack shows it's fairly busy and the stack trace is not very
consistent, eg:
#0 0x00007fa52032aaed in g_free () at /lib64/libglib-2.0.so.0
#1 0x00007fa520e73d1b in virFree (ptrptr=ptrptr@entry=0x55fb2896c1a8) at ../../src/util/viralloc.c:348
#2 0x00007fa520e982d2 in virResetError (err=0x55fb2896c1a0) at ../../src/util/virerror.c:472
#3 virResetError (err=0x55fb2896c1a0) at ../../src/util/virerror.c:468
#4 0x00007fa520e9963c in virEventRunDefaultImpl () at ../../src/util/virevent.c:341
#5 0x00007fa520fd8abd in virNetDaemonRun (dmn=0x55fb28957110) at ../../src/rpc/virnetdaemon.c:858
#6 0x000055fb27b5c8e9 in main (argc=<optimized out>, argv=0x7ffc8adb6188) at ../../src/logging/log_daemon.c:1153
#0 0x00007fa520184a37 in poll () at /lib64/libc.so.6
#1 0x00007fa520324e3e in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#2 0x00007fa520324f73 in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#3 0x00007fa520e9a4f0 in virEventGLibRunOnce () at ../../src/util/vireventglib.c:496
#4 0x00007fa520e99645 in virEventRunDefaultImpl () at ../../src/util/virevent.c:343
#5 0x00007fa520fd8abd in virNetDaemonRun (dmn=0x55fb28957110) at ../../src/rpc/virnetdaemon.c:858
#6 0x000055fb27b5c8e9 in main (argc=<optimized out>, argv=0x7ffc8adb6188) at ../../src/logging/log_daemon.c:1153
#0 0x00007fa520322d9d in g_source_ref () at /lib64/libglib-2.0.so.0
#1 0x00007fa520322e71 in g_source_iter_next () at /lib64/libglib-2.0.so.0
#2 0x00007fa52032479f in g_main_context_check () at /lib64/libglib-2.0.so.0
#3 0x00007fa520324de2 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#4 0x00007fa520324f73 in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#5 0x00007fa520e9a4f0 in virEventGLibRunOnce () at ../../src/util/vireventglib.c:496
#6 0x00007fa520e99645 in virEventRunDefaultImpl () at ../../src/util/virevent.c:343
#7 0x00007fa520fd8abd in virNetDaemonRun (dmn=0x55fb28957110) at ../../src/rpc/virnetdaemon.c:858
#8 0x000055fb27b5c8e9 in main (argc=<optimized out>, argv=0x7ffc8adb6188) at ../../src/logging/log_daemon.c:1153
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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