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bug#30626: 26.0.91; Crash when traversing a `stream-of-directory-files'


From: Eli Zaretskii
Subject: bug#30626: 26.0.91; Crash when traversing a `stream-of-directory-files'
Date: Tue, 27 Feb 2018 20:08:56 +0200

> From: Michael Heerdegen <address@hidden>
> Cc: address@hidden,  address@hidden
> Date: Tue, 27 Feb 2018 13:08:59 +0100
> 
> #+begin_src emacs-lisp
> (seq-doseq (_ (stream-range 1 1000000)) nil)
> #+end_src
> 
> Note that this is executed as a loop due how to streams are implemented,
> although the definition of `seq-doseq' looks recursive.  But it seems
> that gc has a problem with the large number of conses created when
> processing that.

What can we do instead in such cases?  Stack-overflow protection
cannot work in GC, so you are shooting yourself in the foot by
creating such large recursive structures.  By the time we get to GC,
where the problem will happen, it's too late, because the memory was
already allocated.

Does anyone has a reasonable idea for avoiding the crash in such
programs?





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