~/win64-6.5
$ git bisect good
3f2f24d6de4c50e6e3f833296c3e0ff9ccda7409 is the first bad commit
commit 3f2f24d6de4c50e6e3f833296c3e0ff9ccda7409
Author: Norbert Thiebaud <nthiebaud@gmail.com>
Date:   Tue Nov 26 17:38:05 2019 -0800

    source sha:5efa7d4605c8c683bb54a1723d0916e6f0166b52

    source sha:5efa7d4605c8c683bb54a1723d0916e6f0166b52

:040000 040000 d4b096f6eba2d3a3ec88a91440a11263616cc71a c99d8cc6cc269db5b25c8c14f199649c0a07fa9a M      instdir

 ~/win64-6.5
$ git bisect log
# bad: [e81dce33f9408b434377713b586fbfde2925762b] source sha:2891e91a513520d68ea2b8c59c14335861a15253
# good: [832184dd45effc3d2a68e9010c4b8f1d0a70623a] source sha:9bc848cf0d301aa57eabcffa101a1cf87bad6470
git bisect start 'origin/master' 'oldest'
# bad: [8769a12f2f4cc34c9780be6940faa0008491e8bf] source sha:f15d67442972c5f69c71925a6bfa5aa1a39d54eb
git bisect bad 8769a12f2f4cc34c9780be6940faa0008491e8bf
# bad: [8769a12f2f4cc34c9780be6940faa0008491e8bf] source sha:f15d67442972c5f69c71925a6bfa5aa1a39d54eb
git bisect bad 8769a12f2f4cc34c9780be6940faa0008491e8bf
# bad: [77b373998be9e3add6ac24bde56a8d6e727fbf79] source sha:f8e29707df8ebb6acf33ac4e32033252953bc7ef
git bisect bad 77b373998be9e3add6ac24bde56a8d6e727fbf79
# bad: [77b373998be9e3add6ac24bde56a8d6e727fbf79] source sha:f8e29707df8ebb6acf33ac4e32033252953bc7ef
git bisect bad 77b373998be9e3add6ac24bde56a8d6e727fbf79
# bad: [6192c062509a3a3fc2036469cdaca1a4d3a624c8] source sha:141722374d026d783bc1d2ab5656568105017d87
git bisect bad 6192c062509a3a3fc2036469cdaca1a4d3a624c8
# bad: [ee9bcef5720c46ee89d64d4da9cd51aac974ff72] source sha:e01df3488abe6d319c6874ca870afb82a3ad9b1e
git bisect bad ee9bcef5720c46ee89d64d4da9cd51aac974ff72
# bad: [ee9bcef5720c46ee89d64d4da9cd51aac974ff72] source sha:e01df3488abe6d319c6874ca870afb82a3ad9b1e
git bisect bad ee9bcef5720c46ee89d64d4da9cd51aac974ff72
# good: [62a70d58d006ec90127824e882172db704c86e7f] source sha:7c4b5c46dd1679d93a21f015e5a09f3428eb3d2c
git bisect good 62a70d58d006ec90127824e882172db704c86e7f
# good: [a669f042ec9141712643f2f0da5af81e204dd472] source sha:2c4218069429df3e5cb26edc6ec3163f71a942ed
git bisect good a669f042ec9141712643f2f0da5af81e204dd472
# good: [87d494908cb04588e258df50586430383a74c627] source sha:aca2e4d270f472b2cbdb9084a55f1855529ea705
git bisect good 87d494908cb04588e258df50586430383a74c627
# bad: [2ca69c199deb505242bc39e3a1152b6090b9e8a1] source sha:4e1ae2a9a0d2d9185b49677fa4ea2a2b1fe8bab2
git bisect bad 2ca69c199deb505242bc39e3a1152b6090b9e8a1
# good: [1b74620a34787ed507b8c1d32337fb18db9c43cc] source sha:c9c19fed241d678671c485247a34c399ff212228
git bisect good 1b74620a34787ed507b8c1d32337fb18db9c43cc
# good: [79619ce877317835cb387c7159c66e9df0beb315] source sha:51061b780ba42d2b7673de76a729a4084da5ed2b
git bisect good 79619ce877317835cb387c7159c66e9df0beb315
# good: [d738ac700a0dc6abc6b5a0167ff10f18ddfc6fc5] source sha:352966952641eed80ae94de57065b0e0896116a6
git bisect good d738ac700a0dc6abc6b5a0167ff10f18ddfc6fc5
# bad: [3f2f24d6de4c50e6e3f833296c3e0ff9ccda7409] source sha:5efa7d4605c8c683bb54a1723d0916e6f0166b52
git bisect bad 3f2f24d6de4c50e6e3f833296c3e0ff9ccda7409
# good: [1ac7a56f9d4d7e4320414e9097e3ece27b73ef82] source sha:4549de73090284f149ed6ba62818e27739bdaf19
git bisect good 1ac7a56f9d4d7e4320414e9097e3ece27b73ef82
# first bad commit: [3f2f24d6de4c50e6e3f833296c3e0ff9ccda7409] source sha:5efa7d4605c8c683bb54a1723d0916e6f0166b52