$ git bisect good
8a5bc37a8a2abf96de69dc01fe2ccdca32e940bd is the first bad commit
commit 8a5bc37a8a2abf96de69dc01fe2ccdca32e940bd
Author: Norbert Thiebaud <nthiebaud@gmail.com>
Date:   Wed Aug 3 04:49:28 2016 -0700

    source sha:403eefe81b8a0afe888c60452c17d6b2c5d8343f
    
    source sha:403eefe81b8a0afe888c60452c17d6b2c5d8343f

:040000 040000 ae3ba9defefc620fbb69a821e23a087825bf22b5 f78046bc43b4ad1e697af42ccd91a477ede515be M	instdir
$ git bisect log
# bad: [d1443e16cfb22239988bd4bd2e0218cf419d003d] source sha:ce95e39f8e952159844e9dc04a1df402bb103634
# good: [defb73f1c6e2a66dbd21ba89e684f57427e8bc4b] source sha:5b168b3fa568e48e795234dc5fa454bf24c9805e
git bisect start 'origin/master' 'oldest'
# good: [ec8e59ce9cd8538ea131e8d847e2d8ce5532c07f] source sha:5198c98337882319fae176135dcce1ad375ed2f6
git bisect good ec8e59ce9cd8538ea131e8d847e2d8ce5532c07f
# good: [92071ff7213990c7e906cc3f75370e7702f9862e] source sha:27aac319ca9f2d580aea45542c5d0428616f7e0b
git bisect good 92071ff7213990c7e906cc3f75370e7702f9862e
# good: [fa9e5b9cedceea767601989df4994ed84156405b] source sha:55859becb87816aac0170f0f22d5d748fc022612
git bisect good fa9e5b9cedceea767601989df4994ed84156405b
# bad: [364c7cd4b6179984e8c342f042f610b0433bb315] source sha:05c89af876fc7bb2e02e7de84df0cfc2869b0071
git bisect bad 364c7cd4b6179984e8c342f042f610b0433bb315
# bad: [d21a0e2bb89ed7be8952159c08d46e245c9f3ec1] source sha:a04ccc9417bf1997d03e9863f321c1b1535fba8a
git bisect bad d21a0e2bb89ed7be8952159c08d46e245c9f3ec1
# good: [4bd133161f076a90c29e218205cd40a7b785a4db] source sha:40c889105ff758ae09c7d9f423fbc3b85d5e2a53
git bisect good 4bd133161f076a90c29e218205cd40a7b785a4db
# bad: [6769751f59fc285d80ff6cb03dfa2898cc228d04] source sha:569825ea2b64f3682932cd07dae2b244854f4157
git bisect bad 6769751f59fc285d80ff6cb03dfa2898cc228d04
# good: [5b029c97b5a8f9b68e50fb19780297c9f011fb7f] source sha:405db7afbdba02eed9a9a4c4f22000fe623b029c
git bisect good 5b029c97b5a8f9b68e50fb19780297c9f011fb7f
# bad: [235892e99687ff2b263440afdca18e1497a6bb55] source sha:700bcdbd467e5f116e967f7ab6657fdbc7933e56
git bisect bad 235892e99687ff2b263440afdca18e1497a6bb55
# bad: [8a5bc37a8a2abf96de69dc01fe2ccdca32e940bd] source sha:403eefe81b8a0afe888c60452c17d6b2c5d8343f
git bisect bad 8a5bc37a8a2abf96de69dc01fe2ccdca32e940bd
# good: [f76ed2d701bc6f2d0b70b9709a2fa8d738ee89a3] source sha:4acac00df5a85ff006ecead06c4018e88caaf401
git bisect good f76ed2d701bc6f2d0b70b9709a2fa8d738ee89a3
# first bad commit: [8a5bc37a8a2abf96de69dc01fe2ccdca32e940bd] source sha:403eefe81b8a0afe888c60452c17d6b2c5d8343f