~/bibisect-win32-6.1
$ git bisect good
938ca80b3aa3635b5a126b9c45fa5f6502f591c6 is the first bad commit
commit 938ca80b3aa3635b5a126b9c45fa5f6502f591c6
Author: Norbert Thiebaud <nthiebaud@gmail.com>
Date:   Wed Feb 7 02:39:01 2018 -0800

    source sha:e5012e53b919ae4921d6d35660bde323a6f28417

    source sha:e5012e53b919ae4921d6d35660bde323a6f28417

:040000 040000 95ab76b6387986a3e100cc6ad21058fdda7767c1 ab859b5de4e9a37d011d5f058f8e283946e26be1 M      instdir

 ~/bibisect-win32-6.1
$ git bisect log
# bad: [88d02ac2590a28a1d9867e7c75609a28b840b499] source sha:97d44109949a45e5022aa8ca1e51f6b54562a002
# good: [29d08f54c2f71ffee4fe12dbb24c5f5cbedecfd2] source sha:6eeac3539ea4cac32d126c5e24141f262eb5a4d9
git bisect start 'origin/master' 'oldest'
# good: [3a21a91626d246521745fccc77c074c36c2f521d] source sha:42b80f4ed300b08074ed3a6dd48679afd5af760a
git bisect good 3a21a91626d246521745fccc77c074c36c2f521d
# bad: [51d90825decc9edf986acf03a0a322c6daf89c47] source sha:51cb2e66897a9dd5676b33d35a5683a8f8e56ef5
git bisect bad 51d90825decc9edf986acf03a0a322c6daf89c47
# good: [2e037f3054a407f5718aa938e1aa6a9c1d893a89] source sha:8512f13c42ae3fbb287a555616fe10ff04295616
git bisect good 2e037f3054a407f5718aa938e1aa6a9c1d893a89
# good: [49132340b7d55683f13d34385ca09fcbdc2ba3e4] source sha:36114476faf4952a70e4e422cbafaa7125ea6cc6
git bisect good 49132340b7d55683f13d34385ca09fcbdc2ba3e4
# bad: [c8953f085e4d279192d3ed04715101f54eaf5456] source sha:765c98d89fb5b682cc6fb106baec32295a4aabca
git bisect bad c8953f085e4d279192d3ed04715101f54eaf5456
# good: [2851986975a88642dd999c77de8daf1c49ee097e] source sha:951dd781743c975a7d29cc30e88e1b4a56c0b176
git bisect good 2851986975a88642dd999c77de8daf1c49ee097e
# good: [829802e2fcf3c577b72bf4a901567f54800d9c13] source sha:1db745d9342599caad23f1bdc451ed1d1251203b
git bisect good 829802e2fcf3c577b72bf4a901567f54800d9c13
# good: [cad7e02b2d7c3c03e94803e678c96ce52222d95a] source sha:d4e1802c620e3cddb2e7a9f6a573a5a4770bc7a4
git bisect good cad7e02b2d7c3c03e94803e678c96ce52222d95a
# bad: [e6aea9eeb9d45b4b3818fe1dc85f95d5a148e2be] source sha:b64bf854909ce72fa6ea2db05c3aef8995cf32d6
git bisect bad e6aea9eeb9d45b4b3818fe1dc85f95d5a148e2be
# bad: [ce9ae0a2f3f18c4a663d410dc129cdc5c217ed3a] source sha:e89964ebb3ba3bd7d694695c004c5f976d8d9616
git bisect bad ce9ae0a2f3f18c4a663d410dc129cdc5c217ed3a
# bad: [938ca80b3aa3635b5a126b9c45fa5f6502f591c6] source sha:e5012e53b919ae4921d6d35660bde323a6f28417
git bisect bad 938ca80b3aa3635b5a126b9c45fa5f6502f591c6
# good: [4b3fa475cb6381231778bba95cbaec54ed6e932d] source sha:c99527385acf367c748b3dcf3e6a3bb8103f5eee
git bisect good 4b3fa475cb6381231778bba95cbaec54ed6e932d
# first bad commit: [938ca80b3aa3635b5a126b9c45fa5f6502f591c6] source sha:e5012e53b919ae4921d6d35660bde323a6f28417