Re: [Libevent-users] infinite loop in evmap_io_active

[Nick Mathewson <nickm@xxxxxxxxxxxxx>]

On Mon, Apr 11, 2011 at 6:34 AM, Mike Cui <cuicui@xxxxxxxxx> wrote:
> I'm also seeing an infinite loop in evmap_io_active:
>
>        TAILQ_FOREACH(ev, &ctx->events, ev_io_next) {
>                if (ev->ev_events & events)
>                        event_active_nolock(ev, ev->ev_events & events, 1);
>        }
>
> It looks like the ev_io_next pointer points back to itself :(

So, the likeliest reason for this to happen is a corrupt event, as I
just mentioned in my email to Sherif:

"One reason that can happen
is if you add an event, then re-assign it and re-add it without first
deleting it.  To debug that, try enabling debug mode by calling
    event_enable_debug_mode();
near the start of your program (before you construct any event_bases).

It should detect any attempts to modify an event that's currently pending."

HTH,
-- 
Nick
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