Macrobenchmark fails to pull trace on Android 12

[mrmike]

Steps to reproduce issue

1. Clone performance-samples project
2. Open MacrobenchmarkSample in Android Studio. I'm using Bumblebee 2021.1.1 Beta 1.
3. Run TrivialStartupBenchmark on physical device with Android 12 (Pixel 5 in my case)

Expected output

• Tests are passing

Actual output

• Macrobenchmark fails to pull trace file

java.io.FileNotFoundException: /storage/emulated/0/Android/data/com.example.macrobenchmark/cache/TrivialStartupBenchmark_startup[mode=COLD]_iter000_2021-10-26-07-09-40.perfetto-trace: open failed: EACCES (Permission denied)
	at libcore.io.IoBridge.open(IoBridge.java:575)
	at java.io.FileOutputStream.<init>(FileOutputStream.java:236)
	at kotlin.io.FilesKt__FileReadWriteKt.appendBytes(FileReadWrite.kt:115)
	at androidx.benchmark.perfetto.UiStateKt.appendUiState(UiState.kt:45)
	at androidx.benchmark.macro.MacrobenchmarkKt.macrobenchmark(Macrobenchmark.kt:200)
	at androidx.benchmark.macro.MacrobenchmarkKt.macrobenchmarkWithStartupMode(Macrobenchmark.kt:273)
	at androidx.benchmark.macro.junit4.MacrobenchmarkRule.measureRepeated(MacrobenchmarkRule.kt:68)
	at androidx.benchmark.macro.junit4.MacrobenchmarkRule.measureRepeated$default(MacrobenchmarkRule.kt:58)
	at com.example.macrobenchmark.StartupUtilsKt.measureStartup(StartupUtils.kt:32)
	at com.example.macrobenchmark.TrivialStartupBenchmark.startup(TrivialStartupBenchmark.kt:34)
	... 37 trimmed
Caused by: android.system.ErrnoException: open failed: EACCES (Permission denied)
	at libcore.io.Linux.open(Native Method)
	at libcore.io.ForwardingOs.open(ForwardingOs.java:567)
	at libcore.io.BlockGuardOs.open(BlockGuardOs.java:273)
	at libcore.io.ForwardingOs.open(ForwardingOs.java:567)
	at android.app.ActivityThread$AndroidOs.open(ActivityThread.java:7728)
	at libcore.io.IoBridge.open(IoBridge.java:561)
	... 47 more

It looks like the file exists cause I can pull it using adb pull

adb pull /storage/emulated/0/Android/data/com.example.macrobenchmark/cache/TrivialStartupBenchmark_startup[mode=COLD]_iter000_2021-10-26-07-09-40.perfetto-trace

/storage/emulated/0/Android/data/com.example.macrobenchmark/... file pulled, 0 skipped. 38.0 MB/s (6161528 bytes in 0.155s)

[mrmike]

Ok I found that this issue is already fixed and will be released in the next alpha version - https://issuetracker.google.com/issues/203598149.