Re: [Xen-devel] vTPM detaching issue

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Tue, Jun 14, 2016 at 12:32:19PM +0200, Andrea Genuise wrote:
[...]
> libxl: debug: libxl_aoutils.c:88:xswait_timeout_callback: backend
> /local/domain/748/backend/vtpm/749/0/state (hoping for state change to 6):
> xswait timeout (path=/local/domain/748/backend/vtpm/749/0/state)
> libxl: debug: libxl_event.c:677:libxl__ev_xswatch_deregister: watch
> w=0x1c4c1f0 wpath=/local/domain/748/backend/vtpm/749/0/state token=3/0:
> deregister slotnum=3
> libxl: debug: libxl_event.c:867:devstate_callback: backend
> /local/domain/748/backend/vtpm/749/0/state wanted state 6  timed out

This. The toolstack is waiting for the state to change to 6. But that
never happened.

> libxl: debug: libxl_event.c:691:libxl__ev_xswatch_deregister: watch
> w=0x1c4c1f0: deregister unregistered
> libxl: debug: libxl_device.c:937:device_backend_callback: calling
> device_backend_cleanup
> libxl: debug: libxl_event.c:691:libxl__ev_xswatch_deregister: watch
> w=0x1c4c1f0: deregister unregistered
> libxl: debug: libxl_device.c:943:device_backend_callback: Timeout reached,
> initiating forced remove

I think this is due to interaction between frontend and backend, but I'm
not an expert on vtpm so I don't have further comment.

Wei.

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