Problem when process gets killed in MasterDukes example

gistfile1.txt

...
Proc finished: exitcode=1 signal=0
line 6: sleep(25)
==14914== Invalid write of size 8
==14914==    at 0x5162473: uv__finish_close (core.c:276)
==14914==    by 0x5162473: uv__run_closing_handles (core.c:293)
==14914==    by 0x5162473: uv_run (core.c:363)
==14914==    by 0x503AA70: thread_initial_invoke (threads.c:59)
==14914==    by 0x50146BD: MVM_interp_run (interp.c:128)
==14914==    by 0x503AAF5: start_thread (threads.c:87)
==14914==    by 0x5EE26B9: start_thread (pthread_create.c:333)
==14914==  Address 0xdd1e3d0 is 48 bytes inside a block of size 176 free'd
==14914==    at 0x4C2EDEB: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==14914==    by 0x505C80C: MVM_gc_collect_free_nursery_uncopied (collect.c:626)
==14914==    by 0x5057EF9: finish_gc (orchestrate.c:241)
==14914==    by 0x5057EF9: run_gc (orchestrate.c:413)
==14914==    by 0x5058A2D: MVM_gc_enter_from_allocator (orchestrate.c:526)
==14914==    by 0x5058D35: MVM_gc_allocate_nursery (allocation.c:35)
==14914==    by 0x5058F4A: MVM_gc_allocate_object (allocation.c:89)
==14914==    by 0x5034028: MVM_frame_takeclosure (frame.c:1192)
==14914==    by 0x5017492: MVM_interp_run (interp.c:1220)
==14914==    by 0x503AAF5: start_thread (threads.c:87)
==14914==    by 0x5EE26B9: start_thread (pthread_create.c:333)
==14914==  Block was alloc'd at
==14914==    at 0x4C2DB8F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==14914==    by 0x5068B31: MVM_malloc (alloc.h:2)
==14914==    by 0x5068B31: MVM_io_signal_handle (signals.c:320)
==14914==    by 0x50212EB: MVM_interp_run (interp.c:4146)
==14914==    by 0x5128453: MVM_vm_run_file (moar.c:444)
==14914==    by 0x4011DE: main (main.c:302)
==14914== 
==14914== Invalid write of size 8
==14914==    at 0x5162468: uv__finish_close (core.c:276)
==14914==    by 0x5162468: uv__run_closing_handles (core.c:293)
==14914==    by 0x5162468: uv_run (core.c:363)
==14914==    by 0x503AA70: thread_initial_invoke (threads.c:59)
==14914==    by 0x50146BD: MVM_interp_run (interp.c:128)
==14914==    by 0x503AAF5: start_thread (threads.c:87)
==14914==    by 0x5EE26B9: start_thread (pthread_create.c:333)
==14914==  Address 0x7560f98 is 40 bytes inside a block of size 176 free'd
==14914==    at 0x4C2EDEB: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==14914==    by 0x505C80C: MVM_gc_collect_free_nursery_uncopied (collect.c:626)
==14914==    by 0x5057EF9: finish_gc (orchestrate.c:241)
==14914==    by 0x5057EF9: run_gc (orchestrate.c:413)
==14914==    by 0x5058A2D: MVM_gc_enter_from_allocator (orchestrate.c:526)
==14914==    by 0x5058D35: MVM_gc_allocate_nursery (allocation.c:35)
==14914==    by 0x5058F4A: MVM_gc_allocate_object (allocation.c:89)
==14914==    by 0x5034028: MVM_frame_takeclosure (frame.c:1192)
==14914==    by 0x5017492: MVM_interp_run (interp.c:1220)
==14914==    by 0x503AAF5: start_thread (threads.c:87)
==14914==    by 0x5EE26B9: start_thread (pthread_create.c:333)
==14914==  Block was alloc'd at
==14914==    at 0x4C2DB8F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==14914==    by 0x5068B31: MVM_malloc (alloc.h:2)
==14914==    by 0x5068B31: MVM_io_signal_handle (signals.c:320)
==14914==    by 0x50212EB: MVM_interp_run (interp.c:4146)
==14914==    by 0x5128453: MVM_vm_run_file (moar.c:444)
==14914==    by 0x4011DE: main (main.c:302)
==14914== 
Timeout. Asking the process to stop
Proc finished: exitcode=0 signal=1
Program finished
==14914== 
==14914== HEAP SUMMARY:
==14914==     in use at exit: 72,815,270 bytes in 219,553 blocks
==14914==   total heap usage: 399,671 allocs, 180,118 frees, 201,101,085 bytes allocated
==14914== 
==14914== LEAK SUMMARY:
==14914==    definitely lost: 848 bytes in 4 blocks
==14914==    indirectly lost: 0 bytes in 0 blocks
==14914==      possibly lost: 440,288 bytes in 7,856 blocks
==14914==    still reachable: 72,374,134 bytes in 211,693 blocks
==14914==         suppressed: 0 bytes in 0 blocks
==14914== Rerun with --leak-check=full to see details of leaked memory
==14914== 
==14914== For counts of detected and suppressed errors, rerun with: -v
==14914== ERROR SUMMARY: 52 errors from 3 contexts (suppressed: 0 from 0)