[PATCH v2] Add VM info to improve error log message for qemu monitor

[Peter Krempa]

On Tue, Jan 04, 2022 at 15:30:00 +0530, Ani Sinha wrote:
> On Tue, 4 Jan 2022, Rohit Kumar wrote:
> > On 03/01/22 7:12 pm, Ani Sinha wrote:
> > > On Wed, 22 Dec 2021, Rohit Kumar wrote:

[...]

> > > > @@ -694,6 +702,7 @@ qemuMonitorOpenInternal(virDomainObj *vm,
> > > >       mon->fd = fd;
> > > >       mon->context = g_main_context_ref(context);
> > > >       mon->vm = virObjectRef(vm);
> > > > +    mon->domainName = g_strdup(vm->def->name);
> > > do not forget to g_free() this during cleanup in the same function.
> > So, in cleanup: qemuMonitorDispose is called. And there I have added g_free()
> > to clean mon->domainName.
> 
> No, in cleanup, I see qemuMonitorClose() is called where do you do not add
> any additional code to free the allocation.
> 
> This is what I see in cleanup code:
> 
> ```
> cleanup:
>     /* We don't want the 'destroy' callback invoked during
>      * cleanup from construction failure, because that can
>      * give a double-unref on virDomainObj *in the caller,
>      * so kill the callbacks now.
>      */
>     mon->cb = NULL;
>     /* The caller owns 'fd' on failure */
>     mon->fd = -1;
>     qemuMonitorClose(mon);

qemuMonitorClose() eventually calls virObjectUnref(mon). Once the last
reference on the monitor object is removed the object is freed via
qemuMonitorDispose().

This patch has:

@@ -243,6 +244,7 @@ qemuMonitorDispose(void *obj)
     virCondDestroy(&mon->notify);
     g_free(mon->buffer);
     g_free(mon->balloonpath);
+    g_free(mon->domainName);
 }