nlp-parse is not working with child atomspace

[andre-senna]

The following SCM script crashes or hangs after +- 10 cycles.

If I comment the call to cog-set-atomspace! it works ok. If I comment the call to r2l-parse (inside nlp-parse) it will also work ok.

`(add-to-load-path "/usr/local/share/opencog/scm")
(add-to-load-path "/opencog/build/opencog/scm/opencog/")
(add-to-load-path ".")

(use-modules (ice-9 readline))
(activate-readline)

(use-modules (opencog))
(use-modules (opencog nlp) (opencog nlp lg-dict) (opencog nlp relex2logic) (opencog nlp chatbot))

(set-relex-server-host)
(cog-set-atomspace! (cog-new-atomspace (cog-atomspace)))
(while #t (begin
(display ".")
(nlp-parse "What is engineered hardwood flooring?")))
`

[leungmanhin]

This is strange, I can reproduce this issue and it hangs after 5 or 6 cycles on my computer, not sure why yet... But if it's about running with a child atomspace, it might have something with the forward chainer, as the main operation r2l-parse does is to call forward chainer to apply the r2l rules. @ngeiswei any quick thoughts?

[linas]

I assume that "hangs" == 0% cpu use, and not 100% cpu use ... I assume that stack traces show a bunch of threads in deadlock. Does it hang if you put a sleep in the nlp-parse?

[linas]

The idea of the atomspace is that it should be impossible to make it hang, no matter how buggy r2l-parse or the forward chainer is. ...

[leungmanhin]

I don't get any stack traces, it just stop doing anything after 6 cycles, and putting a sleep in nlp-parse doesn't help...