x/sys/cpu: cpu_linux.go:31 /proc/self/auxv: permission denied on android/arm

[rayvbr]

What version of Go are you using (go version)?

Go 1.12

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

Using 'gomobile bind' to compile to android/arm

What did you do?

Compile arbitrary library (hello world) to android/arm using 'gomobile bind' (Android NDK 19b). Include in Android Java app.

Note: used git head of golang.org/x/sys (golang/sys@cc5685c)

What did you expect to see?

Running application

What did you see instead?

2019-02-26 19:12:32.502 8053-0/? E/Go: panic: read proc auxv failed: open /proc/self/auxv: permission denied
2019-02-26 19:12:32.502 8053-8094/? E/GoLog: panic: read proc auxv failed: open /proc/self/auxv: permission denied
2019-02-26 19:12:32.502 8053-0/? E/Go: goroutine 1 [running]:
2019-02-26 19:12:32.502 8053-0/? E/Go: <redacted>vendor/golang.org/x/sys/cpu.init.0()
2019-02-26 19:12:32.502 8053-0/? E/Go: 	<redacted>/vendor/golang.org/x/sys/cpu/cpu_linux.go:31 +0x1ac
2019-02-26 19:12:32.503 8053-8090/? E/CRASH: signal 6 (SIGABRT), code -6 (?), fault addr --------
2019-02-26 19:12:32.503 8053-8090/? E/CRASH: *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

[rayvbr]

Go 1.11.4 with golang.org/x/sys golang/sys@4d1cda0 works fine

[rayvbr]

Possibly related to #9229

Note that not all chipsets seem affected. Crash above was on Snapdragon 821. Exynos 8890 seems unaffected

[gopherbot]

Change https://golang.org/cl/164057 mentions this issue: cpu: don't panic on error reading /proc/self/auxv

[rayvbr]

Problem resolved! Thanks guys!