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Type: Bug
Resolution: Duplicate
Priority: P1: Critical
Fix Version/s: 5.15, 6.2
Affects Version/s: 5.12.8, 5.13.2, 5.14.2, 5.15.0
Component/s: Core: Threads
Labels:
Environment:
Huawei FLA-AL20, Android 9
Huawei nova 3i (HWINE), 3840MB RAM, Android 9
Huawei FIG-LX1 (HWFIG-H), 2816MB RAM, Android 9
Huawei HUAWEI Y9 Prime 2019 (HWSTK-HF), 3840MB RAM, Android 9
Android 10*

Platform/s:

Android

Description

QT application periodically crashes at the destructors of std::thread and std::mutex when it is closed with 'back button' on the device with the following call stack:

 #00 /apex/com.android.runtime/lib64/bionic/libc.so (abort+160)
 #01 /system/lib64/libc++.so (abort_message+232)
 #02 /system/lib64/libc++.so (demangling_terminate_handler()+44)
 #03 /system/lib64/libc++.so (std::__terminate(void ())+12)
 #04 /system/lib64/libc++.so (std::terminate()+52)
 #05 /system/lib64/libc++.so (std::__1::thread::~thread()+20)
 #06 /apex/com.android.runtime/lib64/bionic/libc.so (__cxa_finalize+212)
 #07 /apex/com.android.runtime/lib64/bionic/libc.so (exit+24)
 #08 /data/app/com.domain.myapp-Rs_sm5VrLR1Jj8QW6oYByA==/lib/arm64/libplugins_platforms_qtforandroid_arm64-v8a.so

 #00 /apex/com.android.runtime/lib64/bionic/libc.so (abort+176)
 #01 /apex/com.android.runtime/lib64/bionic/libc.so (__fortify_fatal(char const*, ...)+116)
 #02 /apex/com.android.runtime/lib64/bionic/libc.so (HandleUsingDestroyedMutex(pthread_mutex_t*, char const*)+52)
 #03 /apex/com.android.runtime/lib64/bionic/libc.so (pthread_mutex_destroy+148)
 #04 /system/lib64/libc++.so (std::__1::mutex::~mutex()+8)
 #05 /apex/com.android.runtime/lib64/bionic/libc.so (__cxa_finalize+212)
 #06 /apex/com.android.runtime/lib64/bionic/libc.so (exit+24)
 #07 /data/app/com.domain.myapp-hLEaSANDEatnCiV7f2wbeg==/lib/arm64/libplugins_platforms_qtforandroid_arm64-v8a.so

and there are some other crashes, see [my blog post|https://developernote.com/2020/04/qt-app-crashes-at-the-destructor-of-std-thread-on-android-10/] for more information.

I discussed this on [stackoverflow.com|https://stackoverflow.com/questions/61321845/qt-app-crashes-at-the-destructor-of-stdthread-on-android-10-devices] and another developer confirmed that he has the same crashes in his app and found a workaround.

The workaround is to call System.exit(0) in Java code when 'back button' is pressed on the device (to prevent C++ deinitialization)

These crashes are hard to reproduce, so theoretically there can be some kind of a data race.

QT: 5.14 and 5.15

Android: 10 (lesser 9, but not previous versions)