kinnunen@Kimmos-iMac-Pro OpenSource % tools/Scripts/check-webkit-style -g HEAD Traceback (most recent call last): File "tools/Scripts/check-webkit-style", line 46, in <module> sys.exit(CheckWebKitStyle().main()) File "/Users/kkinnunen/WebKit/OpenSource/Tools/Scripts/webkitpy/style/main.py", line 159, in main patch_checker.check(patch) File "/Users/kkinnunen/WebKit/OpenSource/Tools/Scripts/webkitpy/style/patchreader.py", line 60, in check patch_string = string_utils.decode(patch_string, target_type=str) File "/Users/kkinnunen/WebKit/OpenSource/Tools/Scripts/libraries/webkitcorepy/webkitcorepy/string_utils.py", line 44, in decode return data.decode(encoding, errors=errors) UnicodeDecodeError: 'utf-8' codec can't decode byte 0x82 in position 3450534: invalid start byte The patch is relatively big patch in bug 222964. One can try to simulate the patch also by moving LayoutTests/webgl/{1.0.3,2.0.0} directories around -- unsure if it repros because of lot of files moved, or if there was a particular piece of content that triggers the problem.