From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark H Weaver <mhw@netris.org>
Subject: bug#28211: Grafting code triggers GC/thread-safety issue on Guile
	2.2.2
Date: Thu, 10 May 2018 12:01:15 -0400
Message-ID: <874ljfebzo.fsf@netris.org>
References: <877exuj58y.fsf@gnu.org> <87d0yo1tie.fsf@gnu.org>
	<87fu3124nt.fsf@gnu.org> <878t8reckg.fsf@netris.org>
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To: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@gnu.org>
Cc: Andy Wingo <wingo@igalia.com>, 28211@debbugs.gnu.org

Mark H Weaver <mhw@netris.org> writes:
> From these facts, I believe we can conclude that the error is happening
> within the body of 'begin-thread' in 'n-par-for-each', but outside of
> the body of 'proc' passed to 'n-par-for-each'.

It could also be happening within the 'call-with-backtrace', used here:

  https://git.savannah.gnu.org/cgit/guile.git/tree/module/ice-9/threads.scm?h=v2.2.3#n159

More investigation is needed, but it's unlikely that I'll be able to
spend more time on this today.

       Mark