Re: [Vala] Need help in debugging async code

["marcin saepia net" <marcin saepia net>]

Felipe, it's non threaded.

Michele, good hint! I will check that.

m.

2016-03-18 6:47 GMT+01:00 <michele dionisio gmail com>:

> A crash can happes if you call the callback to wakeup before the yield.
> Are you completly sure that your code is completly asyncrounous in any
> condition.
>
> Il ven mar 18 01:05:05 2016 GMT+0100, Felipe Lavratti scrive:
> > Hey Marcin,
> >
> > Just wondering,
> > Is your program using threading or any threaded object that is handled in
> > this part of code?
> >
> >
> >
> >
> > On Thu, Mar 17, 2016 at 20:44 marcin saepia net <marcin saepia net>
> wrote:
> > > Hi all,
> > >
> > > I encounter random crashes in my app, which (it's my guess) is
> triggered
> > > when I call callback in async method.
> > >
> > > Such as
> > >
> > > public async void something() {
> > >   SourceFunc callback_ref = something.callback;
> > >
> > >   do_something_that_calls_another_callback(() => {
> > >     callback_ref(); // here's crash happening. approximately 1/10000
> calls
> > >   });
> > >
> > >   yield;
> > > }
> > >
> > > The chain of async calls is nested.
> > >
> > > I get stack traces like this:
> https://gist.githubusercontent.com/mspanc/9ca4795f48e56149a9a2/raw/9be534c66409b26820a66d54f8610f2aa6306e1e/gistfile1.txt
> > > It's rather hard to believe that such basic thing as memory allocation
> is
> > > broken in GLib.
> > >
> > > Crash happens totally randomly, once per 1-3 days. You can imagine how
> hard
> > > is to collect test cases. I am trying to hunt more stack traces in
> order to
> > > find a pattern, but maybe in the meantime anyone here can share
> experience
> > > in debugging such issues?
> > >
> > > Or maybe there are some well-known bugs or antipatterns related to
> async
> > > functions that should be avoided?
> > >
> > > I use GLib 2.44 & Vala 0.30.0. I will try to upgrade to 2.46 but I see
> > > nothing related in the changelog.
> > >
> > > m.
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