I cloned latest code from 4.17 branch, compiled and ran my project few times (each time without any changes). About 1 out of 4 times it crashed on startup, I think whenever I tried to push its window in background. Below is the call stack from Crashes folder which seem to come entirely from Unreal code. Also here’s whole crash folder
OS version Linux 4.10.0-27-generic (network name: shitalspitchlx)
Running 4 x86_64 processors (4 logical cores)
Exception was "SIGSEGV: invalid attempt to read memory at address 0x00000000000001f5"
<SOURCE START>
<SOURCE END>
<CALLSTACK START>
Unknown!FLinuxPlatformStackWalk::CaptureStackBackTrace(unsigned long long*, unsigned int, void*) + some bytes
Unknown!FGenericPlatformStackWalk::StackWalkAndDump(char*, unsigned long, int, void*) + some bytes
Unknown!FLinuxCrashContext::CaptureStackTrace() + some bytes
Unknown!CommonLinuxCrashHandler(FGenericCrashContext const&) + some bytes
Unknown!PlatformCrashHandler(int, siginfo_t*, void*) + some bytes
Unknown!/lib/x86_64-linux-gnu/libpthread.so.0(+0x11390) [0x7fc373eb2390] + some bytes
Unknown!FLinuxApplication::FindWindowBySDLWindow(SDL_Window*) + some bytes
Unknown!FLinuxWindow::HitTest(SDL_Window*, SDL_Point const*, void*) + some bytes
Unknown!/home//GitHubSrc/UnrealEngine/Engine/Binaries/Linux/libUE4Editor-Core.so(+0x7a9ad5) [0x7fc36d7aead5] + some bytes
Unknown!/home//GitHubSrc/UnrealEngine/Engine/Binaries/Linux/libUE4Editor-Core.so(+0x7aa478) [0x7fc36d7af478] + some bytes
Unknown!/home//GitHubSrc/UnrealEngine/Engine/Binaries/Linux/libUE4Editor-Core.so(+0x759063) [0x7fc36d75e063] + some bytes
Unknown!FLinuxPlatformMisc::PumpMessages(bool) + some bytes
/home//GitHubSrc/UnrealEngine/Engine/Binaries/Linux/UE4Editor!FEngineLoop::Tick() + some bytes [Runtime/Core/Public/UObject/NameTypes.h:642]
/home//GitHubSrc/UnrealEngine/Engine/Binaries/Linux/UE4Editor!GuardedMain(wchar_t const*) + some bytes [/home//GitHubSrc/UnrealEngine/Engine/Source/Runtime/Launch/Private/Launch.cpp:62]
Unknown!CommonLinuxMain(int, char**, int (*)(wchar_t const*)) + some bytes
Unknown!/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0) [0x7fc3618cc830] + some bytes
Unknown!/home//GitHubSrc/UnrealEngine/Engine/Binaries/Linux/UE4Editor(_start+0x29) [0x416f79] + some bytes
<CALLSTACK END>