~/win64-6.5
$ git bisect good
5dca5309207b6b3cd5bed68da47223e08a3ac3f8 is the first bad commit
commit 5dca5309207b6b3cd5bed68da47223e08a3ac3f8
Author: Norbert Thiebaud <nthiebaud@gmail.com>
Date:   Tue Mar 17 16:44:48 2020 -0700

    source sha:6a05f8810684024303047ac9105be4ff5ae8c536

    source sha:6a05f8810684024303047ac9105be4ff5ae8c536
    source sha:4e755e622f2d782d657626b6234fb3acd3d08e15
    source sha:7af11e2e051eedd790e0ed8c8ac0e1e667c1001b
    source sha:d1a4f95def7d65165a992613784564c02b1c76bb
    source sha:9323307d675b71c501534ee98872a2f00b465bc2
    source sha:d08d5c1857482cb3789ed2896921abeb83f4d217
    source sha:8d9d6d43a9d895eb781a7fb7f47b7e4342883829
    source sha:0c225c7c2b47d7ec57ab7f3f2a900aaac78031d0
    source sha:b389b5958787b142a42d95744f46ccc9b94cf0a9
    source sha:7520e2b2126c05aadb738256313d2f250b9ded62
    source sha:24973523ba59087185d434396fd614e73d72107f

:040000 040000 efa20e4ea7d57e8ac619cba4d6eda7c2780e6df1 4aedbd447717e30be15a582a4be69ff3a1dc14a5 M      instdir

~/win64-6.5
$ git bisect log
# bad: [e81dce33f9408b434377713b586fbfde2925762b] source sha:2891e91a513520d68ea2b8c59c14335861a15253
# good: [832184dd45effc3d2a68e9010c4b8f1d0a70623a] source sha:9bc848cf0d301aa57eabcffa101a1cf87bad6470
git bisect start 'origin/master' 'oldest'
# good: [8769a12f2f4cc34c9780be6940faa0008491e8bf] source sha:f15d67442972c5f69c71925a6bfa5aa1a39d54eb
git bisect good 8769a12f2f4cc34c9780be6940faa0008491e8bf
# good: [8769a12f2f4cc34c9780be6940faa0008491e8bf] source sha:f15d67442972c5f69c71925a6bfa5aa1a39d54eb
git bisect good 8769a12f2f4cc34c9780be6940faa0008491e8bf
# bad: [98515bf62171d4eb9e62d70a69c176a7928b240a] source sha:4102c4df3ae0446c9cdd55d64459d975ed18103f
git bisect bad 98515bf62171d4eb9e62d70a69c176a7928b240a
# bad: [98515bf62171d4eb9e62d70a69c176a7928b240a] source sha:4102c4df3ae0446c9cdd55d64459d975ed18103f
git bisect bad 98515bf62171d4eb9e62d70a69c176a7928b240a
# bad: [a4b2cd84ba5ae8153ca46c0b1d347f87191793b7] source sha:b7d10989d6d7bdbd156288a3773e2da94c97a77e
git bisect bad a4b2cd84ba5ae8153ca46c0b1d347f87191793b7
# good: [6574737d22b84cf7923327870a9282862f8726d8] source sha:64ad7b44e3b36f538a23a851b0e9df7ee0df52b7
git bisect good 6574737d22b84cf7923327870a9282862f8726d8
# good: [f63e666e165cb81f8bb41ce9b65e684f96cdd5ee] source sha:63ea1e811a3b3806b6b2408d759a449f4e086eb3
git bisect good f63e666e165cb81f8bb41ce9b65e684f96cdd5ee
# good: [f63e666e165cb81f8bb41ce9b65e684f96cdd5ee] source sha:63ea1e811a3b3806b6b2408d759a449f4e086eb3
git bisect good f63e666e165cb81f8bb41ce9b65e684f96cdd5ee
# bad: [1163face9920b5e814bfa96e09001496f07cd5f0] source sha:c430eee5ac5caaab7e3fc7e5cd7e39d6e38a84fb
git bisect bad 1163face9920b5e814bfa96e09001496f07cd5f0
# good: [f3ac92d32e27b8a66a6637041fdfc3cd234a7c11] source sha:497f0766c8b9578b125eaa1db68a21308d6e9396
git bisect good f3ac92d32e27b8a66a6637041fdfc3cd234a7c11
# good: [0b185f9938b87d6a779a12bd660cfa45f6b69ae9] source sha:84d361425c23b5010e276ddfde5079693081ff28
git bisect good 0b185f9938b87d6a779a12bd660cfa45f6b69ae9
# bad: [311210615731598f31e4bf73338d9113c78b1c51] source sha:3305d1a02084eff73a4c50db5dc8c6c45241173a
git bisect bad 311210615731598f31e4bf73338d9113c78b1c51
# bad: [f6c31e3d1c60ad1da2c5cb0b370a80bfa10adfa0] source sha:9f6ae57d6a60d54a72243095a6e4c0fc8f6bda07
git bisect bad f6c31e3d1c60ad1da2c5cb0b370a80bfa10adfa0
# bad: [0a6da0abd9b443d832af4b5578e177104d0d8425] source sha:368e9a829e07b3f8624898d69d2c00ec3bc590ec
git bisect bad 0a6da0abd9b443d832af4b5578e177104d0d8425
# bad: [5dca5309207b6b3cd5bed68da47223e08a3ac3f8] source sha:6a05f8810684024303047ac9105be4ff5ae8c536
git bisect bad 5dca5309207b6b3cd5bed68da47223e08a3ac3f8
# good: [6c8a9dbce563fe065d27adb79cf2ab5711fba155] source sha:b07d429f8610c4df93dffa72552f4f759ec0b74f
git bisect good 6c8a9dbce563fe065d27adb79cf2ab5711fba155
# first bad commit: [5dca5309207b6b3cd5bed68da47223e08a3ac3f8] source sha:6a05f8810684024303047ac9105be4ff5ae8c536