mirror of
https://gitlab.com/libvirt/libvirt.git
synced 2025-03-20 07:59:00 +00:00
fe8f1c8b86
Based upon an idea and some research by Wang King <king.wang@huawei.com>
and xinhua.Cao <caoxinhua@huawei.com>.
Since we're assigning the 'client' to our callback event lookaside list,
it's imperative that we grab a reference to the object; otherwise, when
the object is unref'd during virNetServerProcessClients when it's determined
that the virNetServerClientIsClosed and the memory is free'd before perhaps
the object event state callbacks are run. When a virObjectLock() is run,
before sending the message the following trace occurs;
#0 0x00007fda223d66d8 in virClassIsDerivedFrom
(klass=0xdeadbeef, parent=0x7fda24c81b40)
at util/virobject.c:169
#1 0x00007fda223d6a1e in virObjectIsClass
(anyobj=anyobj@entry=0x7fd9e575b400, klass=<optimized out>)
at util/virobject.c:365
#2 0x00007fda223d6a44 in virObjectLock
(anyobj=0x7fd9e575b400)
at util/virobject.c:317
#3 0x00007fda22507f71 in virNetServerClientSendMessage
(client=client@entry=0x7fd9e575b400, msg=msg@entry=0x7fd9ec30de90)
at rpc/virnetserverclient.c:1422
#4 0x00007fda230d714d in remoteDispatchObjectEventSend
(client=0x7fd9e575b400, program=0x7fda24c844e0, procnr=348,
proc=0x7fda2310e5e0 <xdr_remote_domain_event_callback_tunable_msg>,
data=0x7ffc3857fdb0)
at remote.c:3803
#5 0x00007fda230dd71b in remoteRelayDomainEventTunable
(conn=<optimized out>, dom=0x7fda27cd7660, params=0x7fda27f3aae0,
nparams=1,opaque=0x7fd9e6c99e00)
at remote.c:1033
#6 0x00007fda224484cb in virDomainEventDispatchDefaultFunc
(conn=0x7fda27cd0120, event=0x7fda2736ea00, cb=0x7fda230dd610
<remoteRelayDomainEventTunable>, cbopaque=0x7fd9e6c99e00)
at conf/domain_event.c:1910
#7 0x00007fda22446871 in virObjectEventStateDispatchCallbacks
(callbacks=<optimized out>, callbacks=<optimized out>,
event=0x7fda2736ea00,state=0x7fda24ca3960)
at conf/object_event.c:722
#8 virObjectEventStateQueueDispatch
(callbacks=0x7fda24c65800, queue=0x7ffc3857fe90, state=0x7fda24ca3960)
at conf/object_event.c:736
#9 virObjectEventStateFlush (state=0x7fda24ca3960)
at conf/object_event.c:814
#10 virObjectEventTimer (timer=<optimized out>, opaque=0x7fda24ca3960)
at conf/object_event.c:560
#11 0x00007fda223ae8b9 in virEventPollDispatchTimeouts ()
at util/vireventpoll.c:458
#12 virEventPollRunOnce ()
at util/vireventpoll.c:654
#13 0x00007fda223ad1d2 in virEventRunDefaultImpl ()
at util/virevent.c:314
#14 0x00007fda225046cd in virNetDaemonRun (dmn=0x7fda24c775c0)
at rpc/virnetdaemon.c:818
#15 0x00007fda230d6351 in main (argc=<optimized out>, argv=<optimized out>)
at libvirtd.c:1623
Signed-off-by: John Ferlan <jferlan@redhat.com>
LibVirt : simple API for virtualization Libvirt is a C toolkit to interact with the virtualization capabilities of recent versions of Linux (and other OSes). It is free software available under the GNU Lesser General Public License. Virtualization of the Linux Operating System means the ability to run multiple instances of Operating Systems concurrently on a single hardware system where the basic resources are driven by a Linux instance. The library aim at providing long term stable C API initially for the Xen paravirtualization but should be able to integrate other virtualization mechanisms if needed. Daniel Veillard <veillard@redhat.com>