Re: [Libguestfs] [PATCH 0/3] ruby: Fix event handler failure

I won't pretend I really understand what's going on here. I've CC'd this message to Chris since he might have a better idea. https://bugzilla.redhat.com/show_bug.cgi?id=733297 In this bug, it appears that the event log callback goes out of scope and is garbage collected. (This is despite the fact we registered it as a global root). When we invoke the callback later, rb_funcall raises this exception: wrong argument type Proc (expected Data) I checked the type of the callback, and indeed it changes from T_DATA (normal) to T_NONE (raises this exception). My workaround simply checks that the type != T_NONE before calling.