~/bibisect-win32-6.1
$ git bisect bad
0c74725f5b066492e52cc0c81e09992127104f55 is the first bad commit
commit 0c74725f5b066492e52cc0c81e09992127104f55
Author: Norbert Thiebaud <nthiebaud@gmail.com>
Date:   Sat Mar 17 15:58:34 2018 -0700

    source sha:d1027af3c74529827d53e8cf7b0d42a0ee47d1ba

    source sha:d1027af3c74529827d53e8cf7b0d42a0ee47d1ba

:040000 040000 3e419b1a1dc95a7f964a338e6107aaa847ee2ccb b6632785c902150747716eed90dc423e24835bf5 M      instdir

~/bibisect-win32-6.1
$ git bisect log
# bad: [cef8d89a77c3ca1d87bb52ae1d898271bd2689d1] source sha:da49f4aeb8d5e9a7d2cba8855d911e7cc1d2f1e2
# good: [29d08f54c2f71ffee4fe12dbb24c5f5cbedecfd2] source sha:6eeac3539ea4cac32d126c5e24141f262eb5a4d9
git bisect start 'origin/master' 'oldest'
# good: [f7a09816fd0c3b0433d1315de59cc22373e1627e] source sha:965527d76bc233b65795a5203029a65e28773e3b
git bisect good f7a09816fd0c3b0433d1315de59cc22373e1627e
# bad: [31ca4c9973bd7a4084c31506f82c223902610f96] source sha:fe28b80dfc315dfa7f190b808f144cef6c664a29
git bisect bad 31ca4c9973bd7a4084c31506f82c223902610f96
# good: [a7fa1d149358544133fa94355eaee286623bda28] source sha:9549f0708eb0284de38290631cb46838144274ca
git bisect good a7fa1d149358544133fa94355eaee286623bda28
# bad: [783f442a996985ad866336f6690d1c8602549e16] source sha:5b348b1a8ca3c5ba1049aacba1ac2e3c43ed26b7
git bisect bad 783f442a996985ad866336f6690d1c8602549e16
# good: [e13204a58aec76256dcf01e59ae5db860bf5fb95] source sha:d2f95590f478a68a4de6ef05018785523e46506b
git bisect good e13204a58aec76256dcf01e59ae5db860bf5fb95
# bad: [b243f4c069b2025be375cefc1ec7907ff8ce7876] source sha:d414befa3f837aed3d80a77756a154e30dc6cb37
git bisect bad b243f4c069b2025be375cefc1ec7907ff8ce7876
# bad: [140b5391b1dede81aafcc4ed2ce05eee383ac743] source sha:2980e65d9728cfee73c1c49d64e19af50f756521
git bisect bad 140b5391b1dede81aafcc4ed2ce05eee383ac743
# bad: [31ec4f12b8387c9e41364c0efbac2b3247afa9dd] source sha:86c4672f4600daf19238ef25377406f445d9453a
git bisect bad 31ec4f12b8387c9e41364c0efbac2b3247afa9dd
# good: [f4d56913769eba598f148a12e9863403eab67583] source sha:e673a47767cbd272d206ac50f2ac879d5ba71176
git bisect good f4d56913769eba598f148a12e9863403eab67583
# good: [a4153a2191563de2b7b00f5d456039083e460036] source sha:a57bda77c3094558e8dae6ecec761ee4b98e5af3
git bisect good a4153a2191563de2b7b00f5d456039083e460036
# good: [7402c133cc8e3207614ffcc4d018c78f5961b379] source sha:b9cf7da2907f759c98b801939e7c04cf0b80388f
git bisect good 7402c133cc8e3207614ffcc4d018c78f5961b379
# good: [0d4ded6398a342f06fd8193f8a39123e21ae3119] source sha:9886a69c472f212d88f11cfa0f3835e5dcf485b2
git bisect good 0d4ded6398a342f06fd8193f8a39123e21ae3119
# bad: [0c74725f5b066492e52cc0c81e09992127104f55] source sha:d1027af3c74529827d53e8cf7b0d42a0ee47d1ba
git bisect bad 0c74725f5b066492e52cc0c81e09992127104f55
# first bad commit: [0c74725f5b066492e52cc0c81e09992127104f55] source sha:d1027af3c74529827d53e8cf7b0d42a0ee47d1ba