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First observed on freebsd, reproduced on osx:

[532]$ ./src/test/test channelpadding/..
channelpadding/channelpadding_decide_to_pad_channel: [forking] [warn] kevent: Bad file descriptor

  FAIL src/test/test_channelpadding.c:759: assert(tried_to_write_cell OP_EQ 1): 0 vs 1May 09 13:07:08.604 [err] tor_assertion_failed_: Bug: src/or/scheduler.c:398: scheduler_release_channel__real: Assertion channels_pending failed; aborting. (on Tor 0.3.1.0-alpha-dev 9f5b71a7cafbaf14)
May 09 13:07:08.612 [err] Bug: Assertion channels_pending failed in scheduler_release_channel__real at src/or/scheduler.c:398. Stack trace: (on Tor 0.3.1.0-alpha-dev 9f5b71a7cafbaf14)
May 09 13:07:08.612 [err] Bug:     0   test                                0x000000010f350f49 log_backtrace + 73 (on Tor 0.3.1.0-alpha-dev 9f5b71a7cafbaf14)
May 09 13:07:08.612 [err] Bug:     1   test                                0x000000010f3b600e tor_assertion_failed_ + 318 (on Tor 0.3.1.0-alpha-dev 9f5b71a7cafbaf14)
May 09 13:07:08.612 [err] Bug:     2   test                                0x000000010f2de166 scheduler_release_channel__real + 310 (on Tor 0.3.1.0-alpha-dev 9f5b71a7cafbaf14)
May 09 13:07:08.612 [err] Bug:     3   test                                0x000000010ee2b4bc channel_change_state + 1180 (on Tor 0.3.1.0-alpha-dev 9f5b71a7cafbaf14)
May 09 13:07:08.612 [err] Bug:     4   test                                0x000000010ee2ac52 channel_mark_for_close + 386 (on Tor 0.3.1.0-alpha-dev 9f5b71a7cafbaf14)
May 09 13:07:08.612 [err] Bug:     5   test                                0x000000010ee3b0e4 channel_free_list + 2308 (on Tor 0.3.1.0-alpha-dev 9f5b71a7cafbaf14)
May 09 13:07:08.612 [err] Bug:     6   test                                0x000000010ee3a4ef channel_free_all + 223 (on Tor 0.3.1.0-alpha-dev 9f5b71a7cafbaf14)
May 09 13:07:08.612 [err] Bug:     7   test                                0x000000010ea8a673 test_channelpadding_decide_to_pad_channel + 1283 (on Tor 0.3.1.0-alpha-dev 9f5b71a7cafbaf14)
May 09 13:07:08.612 [err] Bug:     8   test                                0x000000010edf25d9 testcase_run_bare_ + 329 (on Tor 0.3.1.0-alpha-dev 9f5b71a7cafbaf14)
May 09 13:07:08.612 [err] Bug:     9   test                                0x000000010edf2374 testcase_run_one + 2932 (on Tor 0.3.1.0-alpha-dev 9f5b71a7cafbaf14)
May 09 13:07:08.612 [err] Bug:     10  test                                0x000000010edf3861 tinytest_main + 1553 (on Tor 0.3.1.0-alpha-dev 9f5b71a7cafbaf14)
May 09 13:07:08.612 [err] Bug:     11  test                                0x000000010edf0397 main + 1703 (on Tor 0.3.1.0-alpha-dev 9f5b71a7cafbaf14)
May 09 13:07:08.612 [err] Bug:     12  libdyld.dylib                       0x00007fffa1660235 start + 1 (on Tor 0.3.1.0-alpha-dev 9f5b71a7cafbaf14)
May 09 13:07:08.612 [err] Bug:     13  ???                                 0x0000000000000002 0x0 + 2 (on Tor 0.3.1.0-alpha-dev 9f5b71a7cafbaf14)
[Lost connection!] 
  [channelpadding_decide_to_pad_channel FAILED]
channelpadding/channelpadding_negotiation: [forking] OK
channelpadding/channelpadding_consensus: [forking] [warn] kevent: Bad file descriptor

  FAIL src/test/test_channelpadding.c:398: assert(tried_to_write_cell OP_EQ 1): 0 vs 1
  [channelpadding_consensus FAILED]
channelpadding/channelpadding_timers: [forking] [warn] kevent: Bad file descriptor

  FAIL src/test/test_channelpadding.c:324: assert(tried_to_write_cell OP_EQ CHANNELS_TO_TEST): 0 vs 100
  [channelpadding_timers FAILED]
3/4 TESTS FAILED. (0 skipped)

The problem might be because of the "kevent: bad file descriptor" thing; there might be a libevent mainloop that is not surviving across fork(), or is getting closed somewhere.