https://logs.chromium.org/v/?s=infra%2Fbuildbucket%2Fcr-buildbucket.appspot.com%2F8960756209148222784%2F%2B%2Fsteps%2Fgo_tests%2F0%2Fstdout

happened during roll
https://chromium-review.googlesource.com/c/infra/infra/+/817676

Relevant part:
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PACKAGE: infra/appengine/sheriff-o-matic/som/testexpectations
--------------------------------------------------------------------------------
.
1 total assertion
.......
8 total assertions
......
14 total assertions
......
20 total assertions
.......
27 total assertions
.......
34 total assertions
...
37 total assertions
....matches: [[ Mac ] /third_party/test_dir/foo_bar/baz.html [ FAIL ] /third_party/test_dir/foo_bar [ PASS ]]......
47 total assertions
..
49 total assertions
......................................
87 total assertions
--- FAIL: ExampleParser_Parse (57.34s)
got:
ASANExpectations line count match? true
LeakExpectations line count match? true
MSANExpectations line count match? true
NeverFixTests line count match? true
SlowTests line count match? true
SmokeTests line count match? true
Error reading: illegal base64 data at input byte 0
want:
ASANExpectations line count match? true
LeakExpectations line count match? true
MSANExpectations line count match? true
NeverFixTests line count match? true
SlowTests line count match? true
SmokeTests line count match? true
StaleTestExpectations line count match? true
TestExpectations line count match? true
W3CImportExpectations line count match? true
FAIL
coverage: 83.8% of statements
FAIL	infra/appengine/sheriff-o-matic/som/testexpectations	57.419s