Currently observed only on linux/arm and netbsd/arm:
http://build.golang.org/log/85e18a65c0f1489a9fa56a4a62c5c4f686cf7852
http://build.golang.org/log/57eb8c7e2d3a85925b2691b4d5c648c1eae9266b
http://build.golang.org/log/74e4aabf174b4c5ac5fac6150f58ef567c9f7845
The profiles are completely empty:
pprof_test.go:174: Bad chan entry, expect:
[0-9]+ [0-9]+ @ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+ 0x[0-9,a-f]+
# 0x[0-9,a-f]+ runtime/pprof_test\.produceChanContention\+0x[0-9,a-f]+ .*/src/pkg/runtime/pprof/pprof_test.go:[0-9]+
# 0x[0-9,a-f]+ runtime/pprof_test\.TestBlockProfile\+0x[0-9,a-f]+ .*/src/pkg/runtime/pprof/pprof_test.go:[0-9]+
got:
--- contention:
cycles/second=999990014
FAIL
FAIL runtime/pprof 10.826s
