~/win32-6.2
$ git bisect bad
ffe2eb373b695a4f777c1d9cc0d54b92a07ca62d is the first bad commit
commit ffe2eb373b695a4f777c1d9cc0d54b92a07ca62d
Author: Norbert Thiebaud <nthiebaud@gmail.com>
Date:   Mon Aug 20 00:50:10 2018 -0700

    source sha:401cba4c20fbc930f034168872642428d7459218

    source sha:401cba4c20fbc930f034168872642428d7459218

:040000 040000 6b6bb7624369e18ebb14aaf62f4f90fb1a96fe90 414d32b64e5d5b31fb76425403d129e5bca666da M      instdir

 ~/win32-6.2
$ git bisect log
# bad: [32300ab0da959bbff1f09736ff655937319e7e3e] source sha:5f01fe15eb2661f1f9ce12d1d99dc2a705b462ee
# good: [b0a56ec98b1368cb5e3e531e0b3f69565af91609] source sha:3a801799536e6870f2fb111b1cc00b9575a35a39
git bisect start 'origin/master' 'oldest'
# bad: [696d8ce3656c1a7018e3647f381d01de8432cb19] source sha:43125f3b0b18b8d9bac9bd459fa234cb5ff9ddb4
git bisect bad 696d8ce3656c1a7018e3647f381d01de8432cb19
# good: [1218427eb9ce1e9def4adec61f2385296191725c] source sha:2bc84658cce1df5050fe788dd0c8a0906a1ca2c3
git bisect good 1218427eb9ce1e9def4adec61f2385296191725c
# good: [f0b79c2ea8f3062276078e770a58ad705092ef1f] source sha:9d31badc81c5044269a50ee2bc16f757f258d617
git bisect good f0b79c2ea8f3062276078e770a58ad705092ef1f
# bad: [ca19e40b065be097fecf7c0915796d042e11993f] source sha:339795d6bd064f57ef33c7cbd5e90433c179e72e
git bisect bad ca19e40b065be097fecf7c0915796d042e11993f
# bad: [49a33538149ad7589dc2362200311e3f47931657] source sha:9952486c71446002e3df89d092d5b31fa841bee4
git bisect bad 49a33538149ad7589dc2362200311e3f47931657
# good: [c761db3f7ec69033b603c4fed4f5cacc2323e99e] source sha:b576ab5073a8cdf5ca2db04838d255e142f5a896
git bisect good c761db3f7ec69033b603c4fed4f5cacc2323e99e
# bad: [7143f16d248dc43d0ba971aba4d62090835a5f56] source sha:a83dee1310c6fd7f7e2b62b3b2640d97a8d0270e
git bisect bad 7143f16d248dc43d0ba971aba4d62090835a5f56
# bad: [0f3fd7fd4ad0d86e3e2c59e57daf0071fcc443f9] source sha:0281aa380a20672d55d1d672fd4a43bdcb6c224d
git bisect bad 0f3fd7fd4ad0d86e3e2c59e57daf0071fcc443f9
# good: [81cc5569d5ce5c50301c4a22564dcd3aae00383a] source sha:f05b0a6aaf8af5d78f9cad8bb953228cb0ce09f1
git bisect good 81cc5569d5ce5c50301c4a22564dcd3aae00383a
# bad: [0857b7fd0f32c52a40960d107756354b7b637983] source sha:7fe7805f0fe7924bb0e190207d8ea320353d2810
git bisect bad 0857b7fd0f32c52a40960d107756354b7b637983
# good: [516e80d360acfa8b8647d1e5de309e76294817b0] source sha:35a254750392dcd738481f5d6e8719cee9fb41b3
git bisect good 516e80d360acfa8b8647d1e5de309e76294817b0
# bad: [fdc1f44c7b9a6b7a0f0b9d370453c7d90349f872] source sha:7d44fb6d97f629839bb896142ccb4ce0c55db707
git bisect bad fdc1f44c7b9a6b7a0f0b9d370453c7d90349f872
# bad: [ffe2eb373b695a4f777c1d9cc0d54b92a07ca62d] source sha:401cba4c20fbc930f034168872642428d7459218
git bisect bad ffe2eb373b695a4f777c1d9cc0d54b92a07ca62d
# first bad commit: [ffe2eb373b695a4f777c1d9cc0d54b92a07ca62d] source sha:401cba4c20fbc930f034168872642428d7459218