# Pastebin jcM5517k
==11340== Memcheck, a memory error detector
==11340== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==11340== Using Valgrind-3.13.0 and LibVEX; rerun with -h for copyright info
==11340== Command: /usr/bin/utop
==11340== Parent PID: 10051
==11340== 
==11340== Invalid read of size 8
==11340==    at 0x6DE49C5: lwt_unix_not_available (lwt_unix_stubs.c:133)
==11340==    by 0x6DE822F: lwt_libev_init (lwt_libev_stubs.c:256)
==11340==    by 0x136238: caml_interprete (in /usr/bin/ocamlrun)
==11340==    by 0x138D90: caml_main (in /usr/bin/ocamlrun)
==11340==    by 0x11B31B: main (in /usr/bin/ocamlrun)
==11340==  Address 0x0 is not stack'd, malloc'd or (recently) free'd
==11340== 
==11340== 
==11340== Process terminating with default action of signal 11 (SIGSEGV)
==11340==  Access not within mapped region at address 0x0
==11340==    at 0x6DE49C5: lwt_unix_not_available (lwt_unix_stubs.c:133)
==11340==    by 0x6DE822F: lwt_libev_init (lwt_libev_stubs.c:256)
==11340==    by 0x136238: caml_interprete (in /usr/bin/ocamlrun)
==11340==    by 0x138D90: caml_main (in /usr/bin/ocamlrun)
==11340==    by 0x11B31B: main (in /usr/bin/ocamlrun)
==11340==  If you believe this happened as a result of a stack
==11340==  overflow in your program's main thread (unlikely but
==11340==  possible), you can try to increase the size of the
==11340==  main thread stack using the --main-stacksize= flag.
==11340==  The main thread stack size used in this run was 8388608.
==11340== 
==11340== HEAP SUMMARY:
==11340==     in use at exit: 11,106,142 bytes in 72 blocks
==11340==   total heap usage: 670 allocs, 598 frees, 11,972,945 bytes allocated
==11340== 
==11340== LEAK SUMMARY:
==11340==    definitely lost: 32 bytes in 2 blocks
==11340==    indirectly lost: 0 bytes in 0 blocks
==11340==      possibly lost: 3,936,288 bytes in 1 blocks
==11340==    still reachable: 7,169,822 bytes in 69 blocks
==11340==         suppressed: 0 bytes in 0 blocks
==11340== Rerun with --leak-check=full to see details of leaked memory
==11340== 
==11340== For counts of detected and suppressed errors, rerun with: -v
==11340== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)