Panic when running t/spec/S32-io/out-buffering.t

gistfile1.txt

Thread 1 "moar" hit Breakpoint 1, MVM_panic (exitCode=1, messageFormat=0x7ffff7697ec8 "Invalid owner in item added to GC worklist") at src/core/exceptions.c:830
830	MVM_NO_RETURN void MVM_panic(MVMint32 exitCode, const char *messageFormat, ...) {
(gdb) bt
#0  MVM_panic (exitCode=1, messageFormat=0x7ffff7697ec8 "Invalid owner in item added to GC worklist") at src/core/exceptions.c:830
#1  0x00007ffff74f304a in MVM_gc_root_add_temps_to_worklist (tc=0x555555758cc0, worklist=0x555558e632f0, snapshot=0x0) at src/gc/roots.c:272
#2  0x00007ffff74f603e in MVM_gc_collect (tc=0x555555758cc0, what_to_do=0 '\000', gen=0 '\000') at src/gc/collect.c:145
#3  0x00007ffff74eb1a2 in run_gc (tc=0x555555758cc0, what_to_do=0 '\000') at src/gc/orchestrate.c:414
#4  0x00007ffff74eb612 in MVM_gc_enter_from_allocator (tc=0x555555758cc0) at src/gc/orchestrate.c:531
#5  0x00007ffff74ebe89 in MVM_gc_allocate_nursery (tc=0x555555758cc0, size=48) at src/gc/allocation.c:35
#6  0x00007ffff74ebc84 in MVM_gc_allocate (tc=0x555555758cc0, size=48) at src/gc/allocation.h:18
#7  0x00007ffff74ebf12 in MVM_gc_allocate_zeroed (tc=0x555555758cc0, size=48) at src/gc/allocation.c:52
#8  0x00007ffff74ec2b5 in MVM_gc_allocate_object (tc=0x555555758cc0, st=0x5555557d1aa0) at src/gc/allocation.c:89
#9  0x00007ffff75ce25c in MVM_string_utf8_decode (tc=0x555555758cc0, result_type=0x5555557de2d0, utf8=0x7fffffffbff0 "x86_64", bytes=6) at src/strings/utf8.c:174
#10 0x00007ffff762b405 in MVM_platform_uname (tc=0x555555758cc0) at src/platform/sys.c:31
#11 0x00007ffff74a0657 in MVM_interp_run (tc=0x555555758cc0, initial_invoke=0x7ffff762e1b5 <toplevel_initial_invoke>, invoke_data=0x555555836188) at src/core/interp.c:5606
#12 0x00007ffff762e31a in MVM_vm_run_file (instance=0x555555758260, filename=0x7fffffffe31f "/home/dogbert/repos/rakudo/perl6.moarvm") at src/moar.c:444
#13 0x000055555555581a in main (argc=10, argv=0x7fffffffde98) at src/main.c:302