[libvirt-users] No way to stop virStream error after guest stop

[JosÉ Luis Valencia Gutierrez]

I just tried removing the callback before calling virStreamFinish and it
worked right, I thought by simply finish the stream would stop the events
and close it, the example I was based on only calls virStreamFinish on EOF
event.


Em qua, 17 de mai de 2017 às 12:49, Martin Kletzander <mkletzan at redhat.com>
escreveu:

> On Wed, May 17, 2017 at 09:08:14AM +0200, Martin Kletzander wrote:
> >On Wed, May 17, 2017 at 01:01:39AM +0000, JosÉ Luis Valencia Gutierrez
> wrote:
> >>I get just _READABLE events repeatedly, virStreamAbort() doesn't work, it
> >>gets out of control after the target domain stops and the unix scocket is
> >>deleted. I ended connecting directly to the unix socket. I just wanted to
> >>ask if it certainly is a bug or perhaps someone went through this before
> >>and have a workaround.
> >>
> >
> >It's OK workaround if you are on the same host and you can connect to
> >the unix socket directly.  But I think this is a bug and we need to fix
> >it for others who need to call this remotely.
> >
> >Thanks for letting us know.  Would you mind filing a bug so that we can
> >track this issue properly?  I'm currently trying to reproduce the issue,
> >although I wasn't successful yet.
> >
>
> So I played around with this for a while now and I can partially
> reproduce what you are seeing, but with the correct usage it goes away.
> So my guess is there is a stray call in your program somewhere or I
> didn't reproduce exactly what you meant.
>
> After receiving the _READABLE event and doing virStreamRecv() that
> returns 0 bytes read, did you try immediatelly removing the callback and
> calling virStreamFinish() on the stream?
>
> What you see happening is something that is possible by not removing the
> callback and then aborting the stream, for example.
>
> >>Jose V.
> >>Em ter, 16 de mai de 2017 às 05:28, Martin Kletzander <
> mkletzan at redhat.com>
> >>escreveu:
> >>
> >>> On Fri, Apr 28, 2017 at 11:01:18PM +0000, JosÉ Luis Valencia Gutierrez
> >>> wrote:
> >>> >Hello everyone,
> >>> >I am opening a virChannel(unix) to a domain and receiving data with a
> >>> >non-blocking virStream using events, when the connected domain gets
> >>> >stopped(which deletes the channel unix socket) by calling destroy,
> >>> >shutdown, pause or migrate on that domain, with the stream open the
> read
> >>> >event is triggered repeatedly, and virStreamRecv returns 0 bytes
> >>> indicating
> >>> > EOF but neither  virStreamFinish nor virStreamFinish is working to
> stop
> >>> >the stream to trigger the event . Each time the event is called I got
> this
> >>> >errors.
> >>> >
> >>> >libvirt: I/O Stream Utils error : this function is not supported by
> >>> >the connection driver: virStreamRecv
> >>> >
> >>> >libvirt: I/O Stream Utils error : this function is not supported by
> >>> >the connection driver: virStreamFinish
> >>> >
> >>> >libvirt: I/O Stream Utils error : this function is not supported by
> >>> >the connection driver: virStreamEventRemoveCallback
> >>> >
> >>> >
> >>> >Is there other way to stop getting this errors? or perhaps this is a
> bug.
> >>> >
> >>>
> >>> This sounds like a bug.  Do you get no other event than just _READABLE?
> >>> No _HANGUP or _ERROR?  Does virStreamAbort() work, even though it's
> >>> probably not what you are looking for?
> >>>
> >>> >Thanks in advance.
> >>> >
> >>> >Jose Valencia
> >>>
> >>> >_______________________________________________
> >>> >libvirt-users mailing list
> >>> >libvirt-users at redhat.com
> >>> >https://www.redhat.com/mailman/listinfo/libvirt-users
> >>>
>
>
>
> >_______________________________________________
> >libvirt-users mailing list
> >libvirt-users at redhat.com
> >https://www.redhat.com/mailman/listinfo/libvirt-users
>
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