~/win64-7.1
$ git bisect good
7f3bcfd33aead329f9fd8cb967345706591d2783 is the first bad commit
commit 7f3bcfd33aead329f9fd8cb967345706591d2783
Author: Norbert Thiebaud <nthiebaud@gmail.com>
Date:   Fri Jun 19 10:00:15 2020 -0700

    source sha:a60dd9ef1361c5925803acaa5292e99277d1faf3

    source sha:a60dd9ef1361c5925803acaa5292e99277d1faf3

:040000 040000 f6ada982f8b7d5bfc14500b00a52209483e0e84b eec630d66c5cd2afb1189bd5853512db72a02a38 M      instdir

 ~/win64-7.1
$ git bisect log
# bad: [75227c95b3bf328358b01ba54183881af474a7bd] source sha:acbe57481e0a10be287aad59201873a0799a94f0
# good: [5dda870d87685eced00ca4ba6d5ceb48aff3c19e] source sha:574c57090642347980d2395e1e183cc7b5c171ad
git bisect start 'origin/master' 'oldest'
# good: [04204113dcef4013b1adadb4055c5bb91fa514c1] source sha:c43e62f26f8d51c2ad97f6c93877ce9d3ae9639e
git bisect good 04204113dcef4013b1adadb4055c5bb91fa514c1
# bad: [1ee8f74a03aac7f0e2fb8f20834221274e9a27f0] source sha:3e4d77a6cbdb40e587dedc0045beced5f006da0a
git bisect bad 1ee8f74a03aac7f0e2fb8f20834221274e9a27f0
# good: [d4ea038f38328629aa674eb4a82b89d9a717966f] source sha:a60a5e769a407fa13b087a111123ceff5a96bc03
git bisect good d4ea038f38328629aa674eb4a82b89d9a717966f
# good: [c826473916cff46a5a9a1daf3ee0b1dd5f3c2aa3] source sha:7cd5cddce02a6e005c0fcd45b9b720c2ca877cfc
git bisect good c826473916cff46a5a9a1daf3ee0b1dd5f3c2aa3
# bad: [e1a0121a53cd1d6d6da6881d17eda7dec11cd26f] source sha:e3dd6e882566c57d27ba5ea4bc623f2b79076530
git bisect bad e1a0121a53cd1d6d6da6881d17eda7dec11cd26f
# bad: [833eb33a4a210f7cd5304048a3d882ea4f8e9e05] source sha:fb8f0ef26d57986bd27c6c5088939c32453e6b06
git bisect bad 833eb33a4a210f7cd5304048a3d882ea4f8e9e05
# bad: [7f3bcfd33aead329f9fd8cb967345706591d2783] source sha:a60dd9ef1361c5925803acaa5292e99277d1faf3
git bisect bad 7f3bcfd33aead329f9fd8cb967345706591d2783
# good: [9e50c654c263d6ff352af7901e846b3d3b4e5872] source sha:8df7447139b1171d8fd29f5d682b053df5936006
git bisect good 9e50c654c263d6ff352af7901e846b3d3b4e5872
# good: [fb5ff525087a1bcc012ecad266d5b1b37b304a36] source sha:8e4c79472644452431381733a5e4b21f98fcdcf3
git bisect good fb5ff525087a1bcc012ecad266d5b1b37b304a36
# first bad commit: [7f3bcfd33aead329f9fd8cb967345706591d2783] source sha:a60dd9ef1361c5925803acaa5292e99277d1faf3