Stuck in doghost()

This is for the branch newTimeDefinition, commit eeb72b2e. I run ./swift -r 10 -t 1 -f UniformBox/uniformBox.hdf5 -m 0.1

There is indeed something strange going on with the links. We use previously freed memory. Here is the address sanitizer output:

=================================================================
==10302==ERROR: AddressSanitizer: heap-use-after-free on address 0x7ff0c56ec918 at pc 0x00000044df17 bp 0x7ff0c845fb50 sp 0x7ff0c845fb40
READ of size 8 at 0x7ff0c56ec918 thread T1
    #0 0x44df16 in runner_doghost /home/matthieu/Desktop/Swift-git/multiTimeStep/swiftsim/src/runner.c:721
    #1 0x44fd1f in runner_main /home/matthieu/Desktop/Swift-git/multiTimeStep/swiftsim/src/runner.c:1150
    #2 0x7ff0cf3e36a9 in start_thread (/lib/x86_64-linux-gnu/libpthread.so.0+0x76a9)
    #3 0x7ff0cf118eec in clone (/lib/x86_64-linux-gnu/libc.so.6+0x106eec)

0x7ff0c56ec918 is located 274712 bytes inside of 864000-byte region [0x7ff0c56a9800,0x7ff0c577c700)
freed by thread T0 here:
    #0 0x7ff0cfe636aa in __interceptor_free (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x986aa)
    #1 0x45c2b7 in engine_maketasks /home/matthieu/Desktop/Swift-git/multiTimeStep/swiftsim/src/engine.c:1049
    #2 0x460007 in engine_step /home/matthieu/Desktop/Swift-git/multiTimeStep/swiftsim/src/engine.c:1919
    #3 0x403901 in main /home/matthieu/Desktop/Swift-git/multiTimeStep/swiftsim/examples/main.c:397
    #4 0x7ff0cf032a3f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x20a3f)

previously allocated by thread T0 here:
    #0 0x7ff0cfe639aa in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x989aa)
    #1 0x45c2fa in engine_maketasks /home/matthieu/Desktop/Swift-git/multiTimeStep/swiftsim/src/engine.c:1050
    #2 0x460007 in engine_step /home/matthieu/Desktop/Swift-git/multiTimeStep/swiftsim/src/engine.c:1919
    #3 0x4038aa in main /home/matthieu/Desktop/Swift-git/multiTimeStep/swiftsim/examples/main.c:397
    #4 0x7ff0cf032a3f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x20a3f)

Thread T1 created by T0 here:
    #0 0x7ff0cfe016a3 in pthread_create (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x366a3)
    #1 0x461ebf in engine_init /home/matthieu/Desktop/Swift-git/multiTimeStep/swiftsim/src/engine.c:2201
    #2 0x40377e in main /home/matthieu/Desktop/Swift-git/multiTimeStep/swiftsim/examples/main.c:320
    #3 0x7ff0cf032a3f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x20a3f)

SUMMARY: AddressSanitizer: heap-use-after-free /home/matthieu/Desktop/Swift-git/multiTimeStep/swiftsim/src/runner.c:721 runner_doghost
Shadow bytes around the buggy address:
  0x0ffe98ad58d0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0ffe98ad58e0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0ffe98ad58f0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0ffe98ad5900: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0ffe98ad5910: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
=>0x0ffe98ad5920: fd fd fd[fd]fd fd fd fd fd fd fd fd fd fd fd fd
  0x0ffe98ad5930: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0ffe98ad5940: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0ffe98ad5950: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0ffe98ad5960: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0ffe98ad5970: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
==10302==ABORTING