Re: [BUG]: when using `xl restore`，xc_evtchn_alloc_unbound will raise this error

[马磊 <aware.why@gmail.com>]

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On Fri, Jan 4, 2013 at 7:42 PM, Ian Campbell <Ian.Campbell@citrix.com>wrote:

> On Fri, 2013-01-04 at 11:34 +0000, 马磊 wrote:
>
> > you said -1 only told there was an error occurring and 3 is the real
> > reason?!
>
> That is correct.
>
> Ian.
>
>
> The excution path is like this:
xl_cmdimpl.c:create_domain() -->
libxl_create.c:libxl_domain_create_restore()
-->  libxl_create.c:do_domain_create() -->  libxl_create.c:domain_restore()
--> libxl_create.c:libxl__build_pre() -->
libxc/xc_evtchn.c:xc_evtchn_alloc_unbound()
-->  libxc/xc_evtchn.c:do_evtchn_op() -->
libxc/xc_private.c:do_xen_hypercall()

so far, it raised an error and do_xen_hypercall return -1 and errno set to
be 3.

You mean that 3 which is the real error code is set by ioctl() and   -1 has
no value of reference!
But -1 is the return value of
src/xen/common/event_channel.c:do_event_channel_op(), we can trace it to
find that it was returned by
src/xen/common/domain.c:rcu_lock_target_domain_by_id() and so it failed at
this point.
Why did it fail there, I can't understand that and that blocked me. I'm
greateful to be helped.

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