Reproduction steps:
1. Open a 2D platformer microgame tutorial project
2. Advance to Change Colors step
3. Press “F” to find Player
Or
1. Open the attached “SaveCrash project
2. Create a new file in Assets folder
3. Save the project using Ctrl + S

Expected result: Unity Editor focuses on Player or saves the project
Actual result: Unity Editor crashes

Reproducible with: 2021.3.11f1, 2021.3.31f1

Reproducible on: Ubuntu 22.04, SteamOS, Fedora 37, Arch

First lines of the stack trace:
#0 0x0055cd97237b9c in burst_signal_handler(int, siginfo_t, void)
#1 0x007fb294dcee70 in funlockfile
#2 0x007fb295b722fd in g_type_check_instance
#3 0x007fb295b67e7c in g_signal_handlers_disconnect_matched
#4 0x0055cd9882afe3 in DisconnectGtkSignal(void, GtkCallbackResponse ()(), void)
#5 0x0055cd98810ea3 in OSOnRemoveMenuItem(MenuItem)
#6 0x0055cd980d4b7f in RemoveItemFromMenu(std::list<MenuItem, std::allocator<MenuItem> >, core::basic_string_ref<char>)
#7 0x0055cd980d4bd3 in RemoveItemFromMenu(std::list<MenuItem, std::allocator<MenuItem> >, core::basic_string_ref<char>)
#8 0x0055cd980d4a13 in MenuController::RemoveMenuItem(core::basic_string_ref<char>)
#9 0x0055cd985896c6 in RecentScenesMenu::Build()
#10 0x0055cd9858962e in RecentScenesMenu::Update()
#11 0x0055cd980d0bda in MenuController::UpdateAllMenus(bool)
#12 0x0055cd980d13a8 in MenuController::ExecuteMainMenuItem(core::basic_string<char, core::StringStorageDefault<char> > const&, MenuController::ExecutionCause)
#13 0x0055cd96d54d51 in EditorApplication_CUSTOM_ExecuteMenuItem(ScriptingBackendNativeStringPtrOpaque*)
#14 0x0000004175f212 in (wrapper managed-to-native) UnityEditor.EditorApplication:ExecuteMenuItem (string)
#15 0x0000004175f173 in UnityEditor.ShortcutManagement.MenuItemEntryDiscoveryInfo:<.ctor>b__7_0 (UnityEditor.ShortcutManagement.ShortcutArguments)
#16 0x000000415f2573 in UnityEditor.ShortcutManagement.Trigger:HandleKeyEvent (UnityEngine.Event,UnityEditor.ShortcutManagement.IContextManager)
#17 0x000000415f1b27 in UnityEditor.ShortcutManagement.ShortcutController:HandleKeyEvent (UnityEngine.Event)
#18 0x000000415f1a33 in UnityEditor.ShortcutManagement.ShortcutIntegration:EventHandler ()
#19 0x000000415f1938 in UnityEditor.EditorApplication:Internal_CallGlobalEventHandler ()
#20 0x000000411d3c4e in (wrapper runtime-invoke) object:runtime_invoke_void (object,intptr,intptr,intptr)

Notes:

1. Crashes with this stack trace were only reported in the 2021.3 LTS stream
2. CQA couldn’t reproduce this crash on any of their Linux machines