ludo@gnu.org (Ludovic Courtès) skribis: > #0 0x00007fbb34bf794d in __GI___pthread_timedjoin_ex (threadid=140441961314048, thread_return=thread_return@entry=0x0, abstime=abstime@entry=0x0, block=block@entry=true) > at pthread_join_common.c:89 > #1 0x00007fbb34bf773c in __pthread_join (threadid=, thread_return=thread_return@entry=0x0) at pthread_join.c:24 > #2 0x00007fbb350d7548 in stop_finalization_thread () at finalizers.c:265 > #3 0x00007fbb350d7759 in scm_i_finalizer_pre_fork () at finalizers.c:290 > #4 0x00007fbb3514f256 in scm_fork () at posix.c:1222 Here’s a reproducer that works quite well (it hangs within a couple of minutes):