On a proprietary test ThreadSanitizer says:
WARNING: DATA RACE
Write by goroutine 4:
time.initLocal()
src/pkg/time/zoneinfo_unix.go:49 +0x11f
sync.(*Once).Do()
src/pkg/sync/once.go:40 +0x7a
time.(*Location).lookup()
src/pkg/time/zoneinfo.go:102 +0x46
time.Time.abs()
src/pkg/time/time.go:253 +0xf9
time.Time.date()
src/pkg/time/time.go:647 +0x31
time.Time.Date()
src/pkg/time/time.go:286 +0x36
[stripped]
Previous read by goroutine 57:
time.Time.abs()
src/pkg/time/time.go:250 +0x6b
time.Time.date()
src/pkg/time/time.go:647 +0x31
time.Time.Date()
src/pkg/time/time.go:286 +0x36
[stripped]
One goroutine reads local Location while another mutates it.
