$ factor
fatal_error: Memory protection fault during gc: 0x17ffc

Nursery   : [0x7f71ca300000 -> 0x7f71ca500000]    2097152 bytes
Aging     : [0x7f71c9f00000 -> 0x7f71ca300000]    4194304 bytes
Tenured   : [0x7f71b7c00000 -> 0x7f71c9b00000]  300941312 bytes
Cards     : [0x7f71b7ab1010 -> 0x7f71b7bda410]    1217536 bytes

Contexts:

  Datastack   : [0x7f71caab6000 -> 0x7f71caaf6000]     262144 bytes
  Retainstack : [0x7f71caa74000 -> 0x7f71caab4000]     262144 bytes
  Callstack   : [0x7f71ca51e000 -> 0x7f71ca61e000]    1048576 bytes

  Datastack   : [0x7f71967be000 -> 0x7f71967fe000]     262144 bytes
  Retainstack : [0x7f719677c000 -> 0x7f71967bc000]     262144 bytes
  Callstack   : [0x7f719667a000 -> 0x7f719677a000]    1048576 bytes

  Datastack   : [0x7f7196638000 -> 0x7f7196678000]     262144 bytes
  Retainstack : [0x7f71965f6000 -> 0x7f7196636000]     262144 bytes
  Callstack   : [0x7f71964f4000 -> 0x7f71965f4000]    1048576 bytes

  Datastack   : [0x7f719ffbf000 -> 0x7f719ffff000]     262144 bytes
  Retainstack : [0x7f719ff7d000 -> 0x7f719ffbd000]     262144 bytes
  Callstack   : [0x7f719fe7b000 -> 0x7f719ff7b000]    1048576 bytes

  Datastack   : [0x7f71a4171000 -> 0x7f71a41b1000]     262144 bytes
  Retainstack : [0x7f71a412f000 -> 0x7f71a416f000]     262144 bytes
  Callstack   : [0x7f71a402d000 -> 0x7f71a412d000]    1048576 bytes

  Active:
  Datastack   : [0x7f71aed4c000 -> 0x7f71aed8c000]     262144 bytes
  Retainstack : [0x7f71aed0a000 -> 0x7f71aed4a000]     262144 bytes
  Callstack   : [0x7f71aec08000 -> 0x7f71aed08000]    1048576 bytes

  Datastack   : [0x7f71ad5a1000 -> 0x7f71ad5e1000]     262144 bytes
  Retainstack : [0x7f71ad55f000 -> 0x7f71ad59f000]     262144 bytes
  Callstack   : [0x7f71ad45d000 -> 0x7f71ad55d000]    1048576 bytes

  Datastack   : [0x7f71ad41b000 -> 0x7f71ad45b000]     262144 bytes
  Retainstack : [0x7f71ad3d9000 -> 0x7f71ad419000]     262144 bytes
  Callstack   : [0x7f71ad2d7000 -> 0x7f71ad3d7000]    1048576 bytes

  Datastack   : [0x7f71ad295000 -> 0x7f71ad2d5000]     262144 bytes
  Retainstack : [0x7f71ad253000 -> 0x7f71ad293000]     262144 bytes
  Callstack   : [0x7f71ad151000 -> 0x7f71ad251000]    1048576 bytes

  Datastack   : [0x7f71ad10f000 -> 0x7f71ad14f000]     262144 bytes
  Retainstack : [0x7f71ad0cd000 -> 0x7f71ad10d000]     262144 bytes
  Callstack   : [0x7f71acfcb000 -> 0x7f71ad0cb000]    1048576 bytes

  Datastack   : [0x7f71acf89000 -> 0x7f71acfc9000]     262144 bytes
  Retainstack : [0x7f71acf47000 -> 0x7f71acf87000]     262144 bytes
  Callstack   : [0x7f71ace45000 -> 0x7f71acf45000]    1048576 bytes

  Datastack   : [0x7f71ace03000 -> 0x7f71ace43000]     262144 bytes
  Retainstack : [0x7f71acdc1000 -> 0x7f71ace01000]     262144 bytes
  Callstack   : [0x7f71accbf000 -> 0x7f71acdbf000]    1048576 bytes

  Datastack   : [0x7f71acc7d000 -> 0x7f71accbd000]     262144 bytes
  Retainstack : [0x7f71acc3b000 -> 0x7f71acc7b000]     262144 bytes
  Callstack   : [0x7f71acb39000 -> 0x7f71acc39000]    1048576 bytes

  Datastack   : [0x7f71acaf7000 -> 0x7f71acb37000]     262144 bytes
  Retainstack : [0x7f71acab5000 -> 0x7f71acaf5000]     262144 bytes
  Callstack   : [0x7f71ac9b3000 -> 0x7f71acab3000]    1048576 bytes

  Datastack   : [0x7f71ac971000 -> 0x7f71ac9b1000]     262144 bytes
  Retainstack : [0x7f71ac92f000 -> 0x7f71ac96f000]     262144 bytes
  Callstack   : [0x7f71ac82d000 -> 0x7f71ac92d000]    1048576 bytes

  Datastack   : [0x7f71ac7eb000 -> 0x7f71ac82b000]     262144 bytes
  Retainstack : [0x7f71ac7a9000 -> 0x7f71ac7e9000]     262144 bytes
  Callstack   : [0x7f71ac6a7000 -> 0x7f71ac7a7000]    1048576 bytes

  Datastack   : [0x7f71a447d000 -> 0x7f71a44bd000]     262144 bytes
  Retainstack : [0x7f71a443b000 -> 0x7f71a447b000]     262144 bytes
  Callstack   : [0x7f71a4339000 -> 0x7f71a4439000]    1048576 bytes

  Datastack   : [0x7f71a5e39000 -> 0x7f71a5e79000]     262144 bytes
  Retainstack : [0x7f71a45c1000 -> 0x7f71a4601000]     262144 bytes
  Callstack   : [0x7f71a44bf000 -> 0x7f71a45bf000]    1048576 bytes

  Datastack   : [0x7f71a42f7000 -> 0x7f71a4337000]     262144 bytes
  Retainstack : [0x7f71a42b5000 -> 0x7f71a42f5000]     262144 bytes
  Callstack   : [0x7f71a41b3000 -> 0x7f71a42b3000]    1048576 bytes

  Datastack   : [0x7f719282e000 -> 0x7f719286e000]     262144 bytes
  Retainstack : [0x7f71905c0000 -> 0x7f7190600000]     262144 bytes
  Callstack   : [0x7f71904be000 -> 0x7f71905be000]    1048576 bytes

  Datastack   : [0x7f71645b5000 -> 0x7f71645f5000]     262144 bytes
  Retainstack : [0x7f7164573000 -> 0x7f71645b3000]     262144 bytes
  Callstack   : [0x7f7164471000 -> 0x7f7164571000]    1048576 bytes

  Datastack   : [0x7f71a5fbf000 -> 0x7f71a5fff000]     262144 bytes
  Retainstack : [0x7f71a5f7d000 -> 0x7f71a5fbd000]     262144 bytes
  Callstack   : [0x7f71a5e7b000 -> 0x7f71a5f7b000]    1048576 bytes

Aborted