Bug Unity crashes after I stop player

After upgrade to 5.6.0f3 Unity crashes when I stop playing a scene (hitting play button when it is pressed).
In Editor.log following error is present:

[xcb] Unknown sequence number while processing queue
[xcb] Most likely this is a multi-threaded client and XInitThreads has not been called
[xcb] Aborting, sorry about that.
Unity: ../../src/xcb_io.c:274: poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost' failed.
/home/builduser/buildslave/unity/build/Editor/Platform/Linux/UsbDevices.cpp:UsbDevicesQuery
/home/builduser/buildslave/unity/build/Editor/Platform/Linux/UndoPlatformDependent.cpp:SetUndoMenuNamePlatformDependent
/home/builduser/buildslave/unity/build/Editor/Platform/Linux/UndoPlatformDependent.cpp:SetUndoMenuNamePlatformDependent
Stacktrace:

at (wrapper managed-to-native) UnityEditor.ContainerWindow.DisplayAllViews () <IL 0x00018, 0x000ed>
at (wrapper managed-to-native) UnityEditor.ContainerWindow.DisplayAllViews () <IL 0x00018, 0x000ed>
at UnityEditor.WindowLayout.Unmaximize (UnityEditor.EditorWindow) [0x001d1] in /home/builduser/buildslave/unity/build/Editor/Mono/GUI/WindowLayout.cs:329
at UnityEditor.WindowLayout.ShowAppropriateViewOnEnterExitPlaymode (bool) [0x00080] in /home/builduser/buildslave/unity/build/Editor/Mono/GUI/WindowLayout.cs:168
at UnityEditor.EditorApplicationLayout.SetStopmodeLayout () [0x00002] in /home/builduser/buildslave/unity/build/Editor/Mono/GUI/EditorApplicationLayout.cs:39
at (wrapper runtime-invoke) object.runtime_invoke_void (object,intptr,intptr,intptr) <IL 0x0001b, 0x000f5>

Native stacktrace:

/opt/Unity/Editor/Data/MonoEmbedRuntime/libmono.so(+0x91be1) [0x7ff667b6abe1]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x1138f) [0x7ff67d30f38f]
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0x38) [0x7ff674c82428]
/lib/x86_64-linux-gnu/libc.so.6(abort+0x169) [0x7ff674c84029]
/lib/x86_64-linux-gnu/libc.so.6(+0x2dbd6) [0x7ff674c7abd6]
/lib/x86_64-linux-gnu/libc.so.6(__assert_fail+0x41) [0x7ff674c7ac81]
/usr/lib/x86_64-linux-gnu/libX11.so.6(+0x3d198) [0x7ff67db71198]
/usr/lib/x86_64-linux-gnu/libX11.so.6(+0x3d24a) [0x7ff67db7124a]
/usr/lib/x86_64-linux-gnu/libX11.so.6(_XEventsQueued+0x5c) [0x7ff67db7155c]
/usr/lib/x86_64-linux-gnu/libX11.so.6(_XGetRequest+0x54) [0x7ff67db74384]
/usr/lib/x86_64-linux-gnu/libX11.so.6(+0x4049e) [0x7ff67db7449e]
/usr/lib/x86_64-linux-gnu/libX11.so.6(_XError+0x130) [0x7ff67db73c60]
/usr/lib/x86_64-linux-gnu/mesa/libGL.so.1(+0x1d401) [0x7ff67de8b401]
/usr/lib/x86_64-linux-gnu/mesa/libGL.so.1(+0x19513) [0x7ff67de87513]
./Unity() [0x1966b1f]
./Unity() [0x254280c]
./Unity() [0x2542abb]
./Unity() [0x2572a38]
./Unity() [0x2572a81]
./Unity() [0x1952e19]
./Unity() [0x1955b9a]
[0x4150080c]
[0x41c673b2]
[0x4113f997]
[0x41c661d0]
[0x40b59915]
/opt/Unity/Editor/Data/MonoEmbedRuntime/libmono.so(+0x38b5d) [0x7ff667b11b5d]
/opt/Unity/Editor/Data/MonoEmbedRuntime/libmono.so(mono_runtime_invoke+0x67) [0x7ff667c0d610]
./Unity() [0xda3f9b]
./Unity() [0xda49fb]
./Unity() [0xda4ad3]
./Unity() [0x1682ad4]
./Unity() [0x1684ac7]
./Unity() [0x1689cee]
./Unity() [0x1960a2c]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x4aab2) [0x7ff67e71dab2]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_dispatch+0x159) [0x7ff67e71d049]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x4a3ef) [0x7ff67e71d3ef]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_loop_run+0xc1) [0x7ff67e71d711]
/usr/lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0(gtk_main+0xb6) [0x7ff67f7ce6a6]
./Unity() [0x4c0bde]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xef) [0x7ff674c6d82f]
./Unity() [0x4db418]

Has someone encountered the issue?

 

I have the same issue. Unity doesn't crash every time I exit play mode, but maybe about 1 out of 4 times. I'm not sure what the fix is. Maybe downgrade to an older version of Unity? I might try doing that.

 

I got the same error kinda annoying now

 

Any progress?
I saw the bug was reported more than year ago and Unity team or Mesa creators do nothing with this.
So, can anyone know how to fix this?

Mesa bug https://bugs.freedesktop.org/show_bug.cgi?id=99781

 

This problem is bad. The latest editor crashes if you try to maximize any tab.

 

If it is Mesa bug, can't Unity Team create a workaround this bug?
And I would like to thank to Unity Team if they would fix it earlier my main engine wasn't be Godot Engine.