=================================================================
==406==ERROR: AddressSanitizer: heap-use-after-free on address 0x607000004d20 at pc 0x7f67626fa643 bp 0x7f67547e6b70 sp 0x7f67547e6b68
READ of size 4 at 0x607000004d20 thread T327
    #0 0x7f67626fa642 in onion_poller_poll /home/zack/contribute/onion/src/onion/poller.c:472:32
    #1 0x7f67626ab93f in onion_poller_poll_start /home/zack/contribute/onion/src/onion/onion.c:401:3
    #2 0x7f6761421609 in start_thread /usr/src/debug/glibc-2.22/nptl/pthread_create.c:334
    #3 0x7f676033ca4c in __clone (/lib64/libc.so.6+0x102a4c)

0x607000004d20 is located 0 bytes inside of 72-byte region [0x607000004d20,0x607000004d68)
freed by thread T322 here:
    #0 0x4ba4c0 in __interceptor_cfree.localalias.0 /home/zack/llvm/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:45
    #1 0x7f67626f7db5 in onion_poller_remove /home/zack/contribute/onion/src/onion/poller.c:310:4
    #2 0x7f67626f9fe0 in onion_poller_poll /home/zack/contribute/onion/src/onion/poller.c:472:5
    #3 0x7f67626ab93f in onion_poller_poll_start /home/zack/contribute/onion/src/onion/onion.c:401:3
    #4 0x7f6761421609 in start_thread /usr/src/debug/glibc-2.22/nptl/pthread_create.c:334

previously allocated by thread T321 here:
    #0 0x4ba7d0 in calloc /home/zack/llvm/projects/compiler-rt/lib/asan/asan_malloc_linux.cc:66
    #1 0x7f67626ba276 in onion_low_calloc /home/zack/contribute/onion/src/onion/low.c:122:11
    #2 0x7f67626f5ad2 in onion_poller_slot_new /home/zack/contribute/onion/src/onion/poller.c:108:44
    #3 0x7f67626ce445 in onion_listen_point_accept /home/zack/contribute/onion/src/onion/listen_point.c:107:28
    #4 0x7f67626f9d11 in onion_poller_poll /home/zack/contribute/onion/src/onion/poller.c:463:10
    #5 0x7f67626aa7a8 in onion_listen /home/zack/contribute/onion/src/onion/onion.c:501:4
    #6 0x7f67626ab05f in onion_listen_start /home/zack/contribute/onion/src/onion/onion.c:366:3
    #7 0x7f6761421609 in start_thread /usr/src/debug/glibc-2.22/nptl/pthread_create.c:334

Thread T327 created by T321 here:
    #0 0x42c259 in pthread_create /home/zack/llvm/projects/compiler-rt/lib/asan/asan_interceptors.cc:239
    #1 0x7f67626aa6bb in onion_listen /home/zack/contribute/onion/src/onion/onion.c:497:5
    #2 0x7f67626ab05f in onion_listen_start /home/zack/contribute/onion/src/onion/onion.c:366:3
    #3 0x7f6761421609 in start_thread /usr/src/debug/glibc-2.22/nptl/pthread_create.c:334

Thread T321 created by T0 here:
    #0 0x42c259 in pthread_create /home/zack/llvm/projects/compiler-rt/lib/asan/asan_interceptors.cc:239
    #1 0x4f40f8 in t06_timeouts /home/zack/contribute/onion/tests/01-internal/06-onion.c:385:3
    #2 0x4f4856 in main /home/zack/contribute/onion/tests/01-internal/06-onion.c:416:3
    #3 0x7f676025a57f in __libc_start_main (/lib64/libc.so.6+0x2057f)

Thread T322 created by T321 here:
    #0 0x42c259 in pthread_create /home/zack/llvm/projects/compiler-rt/lib/asan/asan_interceptors.cc:239
    #1 0x7f67626aa6bb in onion_listen /home/zack/contribute/onion/src/onion/onion.c:497:5
    #2 0x7f67626ab05f in onion_listen_start /home/zack/contribute/onion/src/onion/onion.c:366:3
    #3 0x7f6761421609 in start_thread /usr/src/debug/glibc-2.22/nptl/pthread_create.c:334

SUMMARY: AddressSanitizer: heap-use-after-free /home/zack/contribute/onion/src/onion/poller.c:472:32 in onion_poller_poll
Shadow bytes around the buggy address:
  0x0c0e7fff8950: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c0e7fff8960: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c0e7fff8970: fa fa fa fa fa fa fa fa fa fa 00 00 00 00 00 00
  0x0c0e7fff8980: 00 00 00 fa fa fa fa fa 00 00 00 00 00 00 00 00
  0x0c0e7fff8990: 00 fa fa fa fa fa 00 00 00 00 00 00 00 00 00 fa
=>0x0c0e7fff89a0: fa fa fa fa[fd]fd fd fd fd fd fd fd fd fa fa fa
  0x0c0e7fff89b0: fa fa 00 00 00 00 00 00 00 00 00 fa fa fa fa fa
  0x0c0e7fff89c0: 00 00 00 00 00 00 00 00 00 fa fa fa fa fa 00 00
  0x0c0e7fff89d0: 00 00 00 00 00 00 00 fa fa fa fa fa 00 00 00 00
  0x0c0e7fff89e0: 00 00 00 00 00 fa fa fa fa fa 00 00 00 00 00 00
  0x0c0e7fff89f0: 00 00 00 fa fa fa fa fa 00 00 00 00 00 00 00 00
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
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==406==ABORTING