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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,

--- generator/ruby.ml | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/generator/ruby.ml b/generator/ruby.ml index 97ccfdc..0f71ccc 100644 --- a/generator/ruby.ml +++ b/generator/ruby.ml @@ -404,15 +404,17 @@ event_callback_wrapper_wrapper (VALUE argvv) return Qnil; } +/* Callbacks aren't supposed to throw exceptions. We just print the + * exception on stderr and hope for the best. + */ static VALUE event_callback_handle_exception (VALUE not_used, VALUE exn) { - /* Callbacks aren't supposed to throw exceptions. */ - fprintf (s...