Here is my guess so far: It seems this is a subtle issue in the interplay between ecls and boehm-gc. The GC initializes as soon as a thread is started, but ecls seems to assume it manually needs to initialize. This generates the error, since the initialization can be done only once. To further add to the subtility, so far the problem doesn't seem to be reproducible with other programs using ecls or sage on other machines, for that matter. For a similar problem, see https://lists.opendylan.org/pipermail/bdwgc/2011-March/004445.html. Since this doesn't seem to have anything to do with sage in particular, I guess I will take this issue to the ecls developers.
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