Not Evaluated reproducable deadlock of a program that does nothing else but qDebug() << "hello world" (see attached main.cpp).
Affects currently approx. < 5% of our relevant computers/users - affected environments cannot be fixed, not even with qInstallMessageHandler(), QT_FORCE_STDERR_LOGGING etc.
stack trace:
Attaching to program `C:\Users\trn7rt\AppData\Local\CCS\libnetfile-1.15.7-0\bin\loggingDeadlock.exe', process 6776
[New Thread 6776.0x4c7c]
[New Thread 6776.0x4758]
[New Thread 6776.0x4c64]
[New Thread 6776.0x4fcc]
[New Thread 6776.0x5818]
(gdb) bt
#0 0x00007ffc874f0b11 in ntdll!DbgBreakPoint () from C:\WINDOWS\SYSTEM32\ntdll.dll
#1 0x00007ffc8751cbae in ntdll!DbgUiRemoteBreakin () from C:\WINDOWS\SYSTEM32\ntdll.dll
#2 0x00007ffc87087614 in KERNEL32!BaseThreadInitThunk () from C:\WINDOWS\System32\kernel32.dll
#3 0x00007ffc874a26b1 in ntdll!RtlUserThreadStart () from C:\WINDOWS\SYSTEM32\ntdll.dll
#4 0x0000000000000000 in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
(gdb) info thread
Id Target Id Frame
1 Thread 6776.0x4c7c 0x00007ffc874edb34 in ntdll!ZwWaitForMultipleObjects () from C:\WINDOWS\SYSTEM32\ntdll.dll
2 Thread 6776.0x4758 0x00007ffc874f0a74 in ntdll!ZwWaitForWorkViaWorkerFactory () from C:\WINDOWS\SYSTEM32\ntdll.dll
3 Thread 6776.0x4c64 0x00007ffc874f0a74 in ntdll!ZwWaitForWorkViaWorkerFactory () from C:\WINDOWS\SYSTEM32\ntdll.dll
4 Thread 6776.0x4fcc 0x00007ffc874f0a74 in ntdll!ZwWaitForWorkViaWorkerFactory () from C:\WINDOWS\SYSTEM32\ntdll.dll
5 Thread 6776.0x5818 0x00007ffc874f0b11 in ntdll!DbgBreakPoint () from C:\WINDOWS\SYSTEM32\ntdll.dll
(gdb) thread 1
[Switching to thread 1 (Thread 6776.0x4c7c)]
#0 0x00007ffc874edb34 in ntdll!ZwWaitForMultipleObjects () from C:\WINDOWS\SYSTEM32\ntdll.dll
(gdb) bt
#0 0x00007ffc874edb34 in ntdll!ZwWaitForMultipleObjects () from C:\WINDOWS\SYSTEM32\ntdll.dll
#1 0x00007ffc84de1b40 in WaitForMultipleObjectsEx () from C:\WINDOWS\System32\KernelBase.dll
#2 0x00007ffc84de1a3e in WaitForMultipleObjects () from C:\WINDOWS\System32\KernelBase.dll
#3 0x0000000064941ead in pthread_cond_init () from C:\Users\trn7rt\AppData\Local\CCS\libnetfile-1.15.7-0\bin\libwinpthread-1.dll
#4 0x00000000649421a0 in pthread_cond_init () from C:\Users\trn7rt\AppData\Local\CCS\libnetfile-1.15.7-0\bin\libwinpthread-1.dll
#5 0x0000000064942721 in pthread_cond_wait () from C:\Users\trn7rt\AppData\Local\CCS\libnetfile-1.15.7-0\bin\libwinpthread-1.dll
#6 0x000000006fd07a37 in libstdc+{+}-6!.cxa_guard_acquire () from C:\Users\trn7rt\AppData\Local\CCS\libnetfile-1.15.7-0\bin\libstdc{+}+-6.dll
#7 0x0000000068a08d5c in QLoggingCategory::defaultCategory() () from C:\Users\trn7rt\AppData\Local\CCS\libnetfile-1.15.7-0\bin\Qt5Core.dll
#8 0x000000006889afa8 in qt_message(QtMsgType, QMessageLogContext const&, char const*, char*) () from C:\Users\trn7rt\AppData\Local\CCS\libnetfile-1.15.7-0\bin\Qt5Core.dll
#9 0x0000000068c3910d in QMessageLogger::warning(char const*, ...) const () from C:\Users\trn7rt\AppData\Local\CCS\libnetfile-1.15.7-0\bin\Qt5Core.dll
#10 0x0000000068931ca4 in updateSystemPrivate() () from C:\Users\trn7rt\AppData\Local\CCS\libnetfile-1.15.7-0\bin\Qt5Core.dll
#11 0x0000000068931d75 in systemData() () from C:\Users\trn7rt\AppData\Local\CCS\libnetfile-1.15.7-0\bin\Qt5Core.dll
#12 0x00000000689364f5 in QLocale::QLocale() () from C:\Users\trn7rt\AppData\Local\CCS\libnetfile-1.15.7-0\bin\Qt5Core.dll
#13 0x00000000689ea476 in QResourceFileEngine::QResourceFileEngine(QString const&) () from C:\Users\trn7rt\AppData\Local\CCS\libnetfile-1.15.7-0\bin\Qt5Core.dll
#14 0x0000000068a060dd in _q_resolveEntryAndCreateLegacyEngine_recursive(QFileSystemEntry&, QFileSystemMetaData&, QAbstractFileEngine*&, bool) () from C:\Users\trn7rt\AppData\Local\CCS\libnetfile-1.15.7-0\bin\Qt5Core.dll
#15 0x0000000068a06216 in QFileSystemEngine::resolveEntryAndCreateLegacyEngine(QFileSystemEntry&, QFileSystemMetaData&) () from C:\Users\trn7rt\AppData\Local\CCS\libnetfile-1.15.7-0\bin\Qt5Core.dll
#16 0x00000000689d2739 in QFileInfo::exists(QString const&) () from C:\Users\trn7rt\AppData\Local\CCS\libnetfile-1.15.7-0\bin\Qt5Core.dll
#17 0x00000000688989c1 in QLibraryInfoPrivate::findConfiguration() () from C:\Users\trn7rt\AppData\Local\CCS\libnetfile-1.15.7-0\bin\Qt5Core.dll
#18 0x0000000068898e90 in QLibrarySettings::load() () from C:\Users\trn7rt\AppData\Local\CCS\libnetfile-1.15.7-0\bin\Qt5Core.dll
#19 0x000000006889977b in QLibraryInfo::location(QLibraryInfo::LibraryLocation) () from C:\Users\trn7rt\AppData\Local\CCS\libnetfile-1.15.7-0\bin\Qt5Core.dll
#20 0x0000000068a0b09d in QLoggingRegistry::initializeRules() () from C:\Users\trn7rt\AppData\Local\CCS\libnetfile-1.15.7-0\bin\Qt5Core.dll
#21 0x0000000068a0ca26 in QLoggingRegistry::instance() () from C:\Users\trn7rt\AppData\Local\CCS\libnetfile-1.15.7-0\bin\Qt5Core.dll
#22 0x0000000068a08d88 in QLoggingCategory::defaultCategory() () from C:\Users\trn7rt\AppData\Local\CCS\libnetfile-1.15.7-0\bin\Qt5Core.dll
#23 0x000000000040157d in main () at main.cpp:7