Segmentation Fault in NativeInputSystem:IOCTL on Ubuntu 18.04

[blair1618]

My project uses Unity 2020.2.1f1 with a local copy of the InputSystem repo at the 1.1.0-preview.2 release.

We run Unity tests on a build machine running Ubuntu 18.04 using the command line interface:

$UNITY_EXE -batchmode -nographics -testPlatform playmode -testResults results.xml -runTests -projectPath $MAIN_PROJECT_PATH

When the test runner reaches a section of our code that sets InputSystem.settings.updateMode the process consistently crashes with this stack trace:

Caught fatal signal - signo:11 code:1 errno:0 addr:0x88
Obtained 36 stack frames.
#0 0x0056450495563e in burst_signal_handler(int, siginfo_t*, void*)
#1 0x007f2c08673980 in funlockfile
#2 0x007f2c0a347069 in gdk_x11_get_default_xdisplay
#3 0x00564506984969 in GtkGetKeyboardLayoutName()
#4 0x00564506962fb0 in NewInput::KeyboardCallbacks::IOCTL(int, void*, int)
#5 0x0000004076653f in (wrapper managed-to-native) UnityEngineInternal.Input.NativeInputSystem:IOCTL (int,int,intptr,int)
#6 0x000000407ab278 in Core.Input.ClockworkInputSystem:Awake ()
#7 0x0000004078277a in (wrapper runtime-invoke) object:runtime_invoke_void__this__ (object,intptr,intptr,intptr)
#8 0x007f2bf00cdaf5 in mono_print_method_from_ip
#9 0x007f2bf023d7cc in mono_perfcounter_foreach
#10 0x007f2bf023e679 in mono_runtime_invoke
#11 0x005645051bbed3 in scripting_method_invoke(ScriptingMethodPtr, ScriptingObjectPtr, ScriptingArguments&, ScriptingExceptionPtr*, bool)
#12 0x005645051b6170 in ScriptingInvocation::Invoke(ScriptingExceptionPtr*, bool)
#13 0x005645051b5f31 in ScriptingInvocation::InvokeChecked(ScriptingExceptionPtr*)
#14 0x00564505253ec2 in SerializableManagedRef::CallMethod(Object&, ScriptingMethodPtr)
#15 0x0056450516bbb3 in MonoBehaviour::CallAwake()
#16 0x0056450516c4f6 in MonoBehaviour::AddToManager()
#17 0x005645052f3d4d in AwakeFromLoadQueue::InvokePersistentManagerAwake(AwakeFromLoadQueue::Item*, unsigned int, AwakeFromLoadMode, bool)
#18 0x005645052f33fa in AwakeFromLoadQueue::PersistentManagerAwakeFromLoad()
#19 0x00564504a8b593 in LoadSceneOperation::CompleteAwakeSequence()
#20 0x00564504a8a519 in LoadSceneOperation::PostLoadSceneAdditive()
#21 0x00564504a8a08d in LoadSceneOperation::IntegrateMainThread()
#22 0x00564504a8cafa in PreloadManager::UpdatePreloadingSingleStep(PreloadManager::UpdatePreloadingFlags, int)
#23 0x00564504a8d7ba in PreloadManager::UpdatePreloading()
#24 0x00564504a58b91 in InitPlayerLoopCallbacks()::EarlyUpdateUpdatePreloadingRegistrator::Forward()
#25 0x00564504a46557 in ExecutePlayerLoop(NativePlayerLoopSystem*)
#26 0x00564504a46513 in ExecutePlayerLoop(NativePlayerLoopSystem*)
#27 0x00564504a46888 in PlayerLoop()
#28 0x00564505e56573 in PlayerLoopController::UpdateScene(bool)
#29 0x00564505e4be14 in PlayerLoopController::UpdateSceneIfNeeded()
#30 0x00564505e4934e in Application::TickTimer()
#31 0x0056450696e77c in MainMessageIteration(void*)
#32 0x0056450696e56c in InitializeUnity(void*)
#33 0x0056450696dccb in main
#34 0x007f2c08291bf7 in __libc_start_main
#35 0x005645036c4029 in _start

This same test process had been running reliably on Unity 2020.1, the crash only started occurring after we upgraded to 2020.2.

Has anyone else encountered this crash? Any guesses about how I can resolve it? Thanks in advance.

[JohnPontoco]

This issue is currently blocking our CI pipeline, which is a major pain (we’ve been running without testing for the last month).

Just a hail mary, in case you have a quick thought for a workaround.
@Rene-Damm

Perfectly fine if there isn’t an immediate fix, just trying to find a way to get it functioning again.