[erlang-bugs] Bug: anonymous gen_event process + format_status.

Raimo Niskanen <>
Wed Jul 7 16:46:28 CEST 2010

On Sun, Jun 13, 2010 at 02:02:12PM -0700, Geoff Cant wrote:
> Hi all, it seems during the last round of format_status improvements a
> bug was introduced for anonymous gen_event processes.
> Repro:
> {ok, Pid} = gen_event:start(), sys:get_status(Pid).
> Expected: Status report
> Actual: Crash due to calling lists:concat on a list containing a pid()
> I've done some work on format_status here:
> git fetch git://github.com/archaelus/otp.git format_status_improvements

Thank you! It will be included in 'pu' as gc/gen-format-status-improvements.

I have squashed the commits and reformatted/reworded the commit comment
according to our standards.

Sorry I missed this one when it was posted. It was on the wrong
list (erlang-bugs) so my radar was on low effect... or something.
Sorry about that. Instead I did some more work on the commit formatting.

> I've fixed the bug by porting the gen_fsm StatusHdr code into gen_event
> at 00b032608c3ad3573d2b. Then I refactored the StatusHdr code out of
> gen_server, gen_fsm and gen_event into 'gen' at 9103fa5136d360839aad,
> and extended the test suite to test for the anon gen_event format status
> bug at 480f1282d9bcdd7d40c3.
> Cheers,
> -- 
> Geoff Cant


/ Raimo Niskanen, Erlang/OTP, Ericsson AB

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