[erlang-questions] Erlang 18.0, hanging erlang:memory(total)?

[Nico Kruber]

On Thursday 02 Jul 2015 14:23:01 Rickard Green wrote:
> On Thu, Jul 2, 2015 at 12:29 AM, Nico Kruber <nico.kruber@REDACTED> wrote:
> > Hi folks,
> > is it possible that erlang:memory/1 can hang?
> > 
> > Today I had a unit test failing in the middle of its execution (it runs
> > the
> > same test over and over again and it was like the 20th time it was run).
> > There was a timeout (>50s) in one process not being able to finish its
> > message handling and erlang:process_info(Pid, current_stacktrace) is
> > repeatedly showing the following stacktrace during these 50s:
> > 
> > {current_stacktrace,
> > 
> >              [{erlang,receive_emd,3,[]},
> >              
> >               {erlang,get_mem_data,3,[]},
> >               {erlang,memory,1,[]},
> >               {dht_node_state,details,1,
> >               
> >                   [{file,"src/dht_node_state.erl"},{line,510}]},
> >               
> >               {dht_node,on,2,[{file,"src/dht_node.erl"},{line,384}]},
> >               {mockup_dht_node,on,2,
> >               
> >                   [{file,"test/mockup_dht_node.erl"},{line,67}]},
> >               
> >               {gen_component,on,3,
> >               
> >                   [{file,"src/gen_component.erl"},{line,614}]}]}
> > 
> > The line in the dht_node_state module literally only calls
> > erlang:memory(total) and creates a record with this info. Apparently, it
> > never gets out of erlang:memory/1 :(
> > 
> > 
> > Thanks for your help
> > Nico
> > _______________________________________________
> > erlang-questions mailing list
> > erlang-questions@REDACTED
> > http://erlang.org/mailman/listinfo/erlang-questions
> 
> The bug fixed in OTP-18.0.1 (and OTP-17.5.6.1) can cause such a hang.
> 
> Regards,
> Rickard

ok, I'll keep an eye on 18.0.1 on our test systems
-> note however, that I encountered the bug not "just after emulator start" as 
stated in the release log. Also since I ran several tests before the failing 
one, several calls to erlang:memory/1 succeeded before the hang!


Nico
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