art::ConditionVariable::WaitHoldingLocks(art::Thread*)

Question

Our mobile app is published in the Google play store. The Crashes and ANR report is generated in Firebase Crashlytics. There is an ANR shown as below.

0 libc.so (syscall+28)
1 libart.so(art::ConditionVariable::WaitHoldingLocks(art::Thread*)+140)
2 libart.so(art::ThreadList::WaitForOtherNonDaemonThreadsToExit(bool)+336)
3 libart.so(art::JII::DestroyJavaVM(_JavaVM*)+32)
4 libandroid_runtime.so(android::AndroidRuntime::start(char const*, android::Vector<android::String8> const&, bool)+1032)
5 app_process64(main+1368)
6 libc.so(__libc_init+96) 

What does this ANR mean?
Thank you in advance.

Answer 1

I believe it has a connection with some routine added in mobile app which is preventing screen from sleep. For example: If your mobile app used the following code to prevent the screen from sleep "getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);" This issue is not device specific, I also experience this on Samsung Galaxy active tab with Android 11 running on it. You should give it a try by removing any screen prevention code. Thank you.