[erlang-questions] cth_log_redirect crashes with timeout in application_controller?

[Roger Lipscombe]

I'm seeing the following when I run Common Test (via ct:run_test/1) .
How can I diagnose/fix it?

...stuff...

=ERROR REPORT==== 7-May-2014::15:59:15 ===
** gen_event handler cth_log_redirect crashed.
** Was installed in error_logger
** Last event was: {info_report,<0.30.0>,
                                {<0.7.0>,std_info,
                                 [{application,asn1},
                                  {exited,stopped},
                                  {type,temporary}]}}
** When handler state == {eh_state,tc_log_async,imp_os_upgrade_SUITE,
                                   undefined,factory_imp_upgrades,false,false}
** Reason == {timeout,{gen_server,call,
                                  [application_controller,
                                   which_applications]}}

=INFO REPORT==== 7-May-2014::15:59:15 ===
    application: sasl
    exited: stopped
    type: temporary

...more normal-looking stuff...

...scary error report stuff, which I assume is caused by the crash in
cth_log_redirect, rather than the cause of same...

What would be causing application_controller:which_applications to timeout?

Erlang R16B03, by the way.

Thanks,
Roger.