Re: [Xen-devel] Xen 4.7 crash

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Aaron Cornelius writes ("Re: [Xen-devel] Xen 4.7 crash"):
> We realized that we had forgotten to remove the domain from the 
> permissions list when the domain is deleted (which would cause the error 
> we saw).  The application was updated to remove the domain from the 
> permissions list:
> 1. retrieve the permissions with xs_get_permissions()
> 2. find the domain ID that is being deleted
> 3. memmove() the remaining domains down by 1 to "delete" the old domain 
> from the permissions list
> 4. update the permissions with xs_set_permissions()
> 
> After we made that change, a load test over the weekend confirmed that 
> the Xen crash no longer happens.  We checked this morning first thing 
> and confirmed that without this change the crash reliably occurs.

This is rather odd behaviour.  I don't think xenstored should hang
onto the domain's xs ring page just because the domain is still
mentioned in a permission list.

But it may do.  I haven't checked the code.  Are you using the
ocaml xenstored (oxenstored) or the C one ?

Ian.

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