~/bibisect-win32-6.1
$ git bisect good
bb0a665d52b9a1d93fbcfa758c2cf953d2db29f9 is the first bad commit
commit bb0a665d52b9a1d93fbcfa758c2cf953d2db29f9
Author: Norbert Thiebaud <nthiebaud@gmail.com>
Date:   Tue Jan 23 09:20:45 2018 -0800

    source sha:57991f885e60d04e93bf5004d4fdceee7d29f3d8

    source sha:57991f885e60d04e93bf5004d4fdceee7d29f3d8

:040000 040000 3b02362a23385f14c65eacf27696172ded6d42d8 cb8a5bf30499a1b71a4db09e30d2749d7909213d M      instdir

~/bibisect-win32-6.1
$ git bisect log
# bad: [8dda4c6f8524f4e7b90d498be94ab4a6200d9ef9] source sha:06cfd5a962f9d8d9462fc270f1b1f730c90bddfe
# good: [29d08f54c2f71ffee4fe12dbb24c5f5cbedecfd2] source sha:6eeac3539ea4cac32d126c5e24141f262eb5a4d9
git bisect start 'origin/master' 'oldest'
# good: [74d1a50a53c6b1175d2ee604a8a542af05efb052] source sha:cc949585d51f5fdbd1a4d5b29c38a03d0c637caa
git bisect good 74d1a50a53c6b1175d2ee604a8a542af05efb052
# good: [be481fb4cb484449318c72495a87ac3b691eb98f] source sha:1099ae1c16cd8323d877e894d8ce213ef8e1c349
git bisect good be481fb4cb484449318c72495a87ac3b691eb98f
# good: [919feb4ee594c4c00fe8bc35e4dd35d16498c64c] source sha:80799ed83b5ba4b803224966737d7c040f17f5d9
git bisect good 919feb4ee594c4c00fe8bc35e4dd35d16498c64c
# good: [fbc85b8b3dd3d69cb0b7b0c07d456cba7398be80] source sha:430a56228ad50dde9399af30d638411380f93258
git bisect good fbc85b8b3dd3d69cb0b7b0c07d456cba7398be80
# good: [808364c225901b17653f601e527e292c8b5d57e5] source sha:3f161c012dd68ff08ff3538ef69f2800bd84640d
git bisect good 808364c225901b17653f601e527e292c8b5d57e5
# bad: [dfb1103060429471c645698ab72478ce54c6c6d6] source sha:f8aca037896ce7085f0be0ab524b524bae57d38c
git bisect bad dfb1103060429471c645698ab72478ce54c6c6d6
# bad: [e8783be945eabc00e604ae868398ff61aa64eed1] source sha:5b9d0d4a999ffeec47cedb09599e458a632a4946
git bisect bad e8783be945eabc00e604ae868398ff61aa64eed1
# good: [90de99ddeceef4dcd50585236e86852d4e164988] source sha:f16fdfa559ab62ccde2c2c0cbe1fc9e5ca2f3630
git bisect good 90de99ddeceef4dcd50585236e86852d4e164988
# bad: [bb0a665d52b9a1d93fbcfa758c2cf953d2db29f9] source sha:57991f885e60d04e93bf5004d4fdceee7d29f3d8
git bisect bad bb0a665d52b9a1d93fbcfa758c2cf953d2db29f9
# good: [8eede829d9e1e79bdcbbc76abf25ad5f259944bc] source sha:e3ee065312e295300fb25457e18344225eeffbd4
git bisect good 8eede829d9e1e79bdcbbc76abf25ad5f259944bc
# good: [958ca0caaeaa860b9765d71889d0f3872bb87ba6] source sha:c73f88de8bc6f892ff1215c5f634ff0bfca04553
git bisect good 958ca0caaeaa860b9765d71889d0f3872bb87ba6
# first bad commit: [bb0a665d52b9a1d93fbcfa758c2cf953d2db29f9] source sha:57991f885e60d04e93bf5004d4fdceee7d29f3d8