docs: file the Hyprland layoutmsg crash with preserved evidence

SIGSEGV via uncaught bad_variant_access in Layout::CAlgorithm::layoutMsg on a layoutmsg mfact dispatch. Upstream bug, seen on v0.54.1 (March) and v0.55.4 (today), both times from the layout-resize binds. Crash reports and tmpfs log excerpts land in working/hyprland-layoutmsg-crash/ so the evidence survives a reboot; graded [#B] (Critical x rare) in todo.org.

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diff --git a/working/hyprland-layoutmsg-crash/crash-report-2026-03-07-pid1812.txt b/working/hyprland-layoutmsg-crash/crash-report-2026-03-07-pid1812.txt
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+--------------------------------------------
+   Hyprland Crash Report
+--------------------------------------------
+All these computers...
+
+Hyprland received signal 11(SEGV)
+Version: 4b07770b9ef1cceb2e6f56d33538aaffb9186b9c
+Tag: v0.54.1
+Date: Tue Mar 3 21:06:41 2026
+Flags:
+
+System info:
+	System name: Linux
+	Node name: ratio
+	Release: 6.18.16-1-lts
+	Version: #1 SMP PREEMPT_DYNAMIC Wed, 04 Mar 2026 18:09:01 +0000
+
+GPU:
+	c3:00.0 Display controller [0380]: Advanced Micro Devices, Inc. [AMD/ATI] Strix Halo [Radeon Graphics / Radeon 8050S Graphics / Radeon 8060S Graphics] [1002:1586] (rev c1)
+
+
+os-release:
+	NAME="Arch Linux"
+	PRETTY_NAME="Arch Linux"
+	ID=arch
+	BUILD_ID=rolling
+	ANSI_COLOR="38;2;23;147;209"
+	HOME_URL="https://archlinux.org/"
+	DOCUMENTATION_URL="https://wiki.archlinux.org/"
+	SUPPORT_URL="https://bbs.archlinux.org/"
+	BUG_REPORT_URL="https://gitlab.archlinux.org/groups/archlinux/-/issues"
+	PRIVACY_POLICY_URL="https://terms.archlinux.org/docs/privacy-policy/"
+	LOGO=archlinux-logo
+
+Libraries:
+Hyprgraphics: built against 0.5.0, system has 0.5.0
+Hyprutils: built against 0.11.0, system has 0.11.0
+Hyprcursor: built against 0.1.13, system has 0.1.13
+Hyprlang: built against 0.6.8, system has 0.6.8
+Aquamarine: built against 0.10.0, system has 0.10.0
+
+Backtrace:
+	# | Hyprland(_Z12getBacktracev+0x61) [0x5610bf4fa961]
+		getBacktrace()
+		??:?
+	#1 | Hyprland(_ZN13CrashReporter18createAndSaveCrashEi+0xcd6) [0x5610bf45b666]
+		CrashReporter::createAndSaveCrash(int)
+		??:?
+	#2 | Hyprland(+0x27d31e) [0x5610bf3a931e]
+		std::__format::_Formatting_scanner<std::__format::_Sink_iter<char>, char>::_M_format_arg(unsigned long)
+		??:?
+	#3 | /usr/lib/libc.so.6(+0x3e2d0) [0x7f7a8be4d2d0]
+		??
+		??:0
+	#4 | Hyprland(+0x1f62fe) [0x5610bf3222fe]
+		std::__throw_bad_variant_access(unsigned int)
+		??:?
+	#5 | Hyprland(_ZN6Layout10CAlgorithm9layoutMsgB5cxx11ERKSt17basic_string_viewIcSt11char_traitsIcEE+0x85) [0x5610bf575df5]
+		Layout::CAlgorithm::layoutMsg[abi:cxx11](std::basic_string_view<char, std::char_traits<char> > const&)
+		??:?
+	#6 | Hyprland(_ZN6Layout6CSpace9layoutMsgB5cxx11ERKSt17basic_string_viewIcSt11char_traitsIcEE+0x37) [0x5610bf57aa07]
+		Layout::CSpace::layoutMsg[abi:cxx11](std::basic_string_view<char, std::char_traits<char> > const&)
+		??:?
+	#7 | Hyprland(_ZN6Layout14CLayoutManager9layoutMsgB5cxx11ERKSt17basic_string_viewIcSt11char_traitsIcEE+0xce) [0x5610bf57275e]
+		Layout::CLayoutManager::layoutMsg[abi:cxx11](std::basic_string_view<char, std::char_traits<char> > const&)
+		??:?
+	#8 | Hyprland(_ZN15CKeybindManager9layoutmsgENSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE+0x4f) [0x5610bf5a1cbf]
+		CKeybindManager::layoutmsg(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)
+		??:?
+	#9 | Hyprland(_ZNSt17_Function_handlerIF15SDispatchResultNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEPS7_E9_M_invokeERKSt9_Any_dataOS6_+0x63) [0x5610bf5ceed3]
+		std::_Function_handler<SDispatchResult (std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >), SDispatchResult (*)(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)>::_M_invoke(std::_Any_data const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&&)
+		??:?
+	#1 | Hyprland(+0x306750) [0x5610bf432750]
+		CHyprCtl::CHyprCtl()
+		??:?
+	#11 | Hyprland(_ZNSt17_Function_handlerIFNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE20eHyprCtlOutputFormatS5_EPS7_E9_M_invokeERKSt9_Any_dataOS6_OS5_+0x6b) [0x5610bf44f17b]
+		std::_Function_handler<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > (eHyprCtlOutputFormat, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >), std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > (*)(eHyprCtlOutputFormat, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)>::_M_invoke(std::_Any_data const&, eHyprCtlOutputFormat&&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&&)
+		??:?
+	#12 | Hyprland(_ZN8CHyprCtl8getReplyENSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE+0x57e) [0x5610bf42d4de]
+		CHyprCtl::getReply(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)
+		??:?
+	#13 | Hyprland(+0x308772) [0x5610bf434772]
+		CHyprCtl::CHyprCtl()
+		??:?
+	#14 | /usr/lib/libwayland-server.so.0(wl_event_loop_dispatch+0x1d2) [0x7f7a8cafa182]
+		??
+		??:0
+	#15 | /usr/lib/libwayland-server.so.0(wl_display_run+0x37) [0x7f7a8cafc297]
+		??
+		??:0
+	#16 | Hyprland(_ZN17CEventLoopManager9enterLoopEv+0x2c1) [0x5610bf631811]
+		CEventLoopManager::enterLoop()
+		??:?
+	#17 | Hyprland(main+0x1476) [0x5610bf32b756]
+		main
+		??:?
+	#18 | /usr/lib/libc.so.6(+0x276c1) [0x7f7a8be366c1]
+		??
+		??:0
+	#19 | /usr/lib/libc.so.6(__libc_start_main+0x89) [0x7f7a8be367f9]
+		??
+		??:0
+	#2 | Hyprland(_start+0x25) [0x5610bf393d35]
+		_start
+		??:?
+
+
+Log tail:
+DEBUG ]: Hyprctl: new connection from pid 6904
+DEBUG ]: Hyprctl: new connection from pid 6918
+DEBUG ]: Hyprctl: new connection from pid 6920
+DEBUG ]: Hyprctl: new connection from pid 6923
+DEBUG ]: CConfigManager: file /home/cjennings/.config/hypr/hyprland.conf modified, reloading
+DEBUG ]: Using config: /home/cjennings/.config/hypr/hyprland.conf
+DEBUG ]: ApplyConfigToKeyboard for "video-bus", hasconfig: 0
+DEBUG ]: Not applying config to keyboard, it did not change.
+DEBUG ]: ApplyConfigToKeyboard for "power-button", hasconfig: 0
+DEBUG ]: Not applying config to keyboard, it did not change.
+DEBUG ]: ApplyConfigToKeyboard for "keychron-q6-pro-keyboard", hasconfig: 0
+DEBUG ]: Not applying config to keyboard, it did not change.
+DEBUG ]: Applied config to mouse keychron-q6-pro-mouse, sens 0.00
+DEBUG ]: Applied config to mouse keychron-q6-pro-keyboard-1, sens 0.00
+WARN ]: No rule found for DP-4, trying to use the first.
+DEBUG ]: Applying monitor rule for DP-4
+DEBUG ]: Monitor DP-4: requested preferred, using preferred mode 3440x1440@59.97Hz
+DEBUG ]: output DP-4 succeeded basic test on format DRM_FORMAT_XRGB8888
+DEBUG from aquamarine ]: drm: Modesetting DP-4 with 3440x1440@59.97Hz
+DEBUG ]: Monitor DP-4 data dump: res 3440x1440@59.97Hz, scale 1.00, transform 0, pos 0x0, 10b 0
+DEBUG ]: [CXDGOutputProtocol] updating all xdg_output heads
+WARN ]: FIXME: color management protocol is enabled and outputs changed, check preferred image description changes
+DEBUG ]: [CXDGOutputProtocol] updating all xdg_output heads
+WARN ]: No rule found for DP-4, trying to use the first.
+DEBUG ]: [CXDGOutputProtocol] updating all xdg_output heads
+DEBUG ]: arrangeMonitors: 1 to arrange
+DEBUG ]: arrangeMonitors: DP-4 auto [0, 0]
+DEBUG ]: arrangeMonitors: DP-4 xwayland [0, 0]
+DEBUG ]: [CXDGOutputProtocol] updating all xdg_output heads
+DEBUG ]: [CXDGOutputProtocol] updating all xdg_output heads
+DEBUG from aquamarine ]: drm: Cursor buffer imported into KMS with id 170
+ERR ]: CConfigWatcher: got an event for wd 1 which we don't have?!
+DEBUG ]: Hyprctl: new connection from pid 2089
+DEBUG ]: Hyprctl: new connection from pid 1894
+DEBUG ]: Hyprctl: new connection from pid 2089
+DEBUG ]: Hyprctl: new connection from pid 2089
+DEBUG ]: Hyprctl: new connection from pid 2089
+DEBUG ]: Hyprctl: new connection from pid 2089
+DEBUG ]: Hyprctl: new connection from pid 2089
+DEBUG ]: Hyprctl: new connection from pid 2089
+DEBUG ]: Hyprctl: new connection from pid 2089
+DEBUG ]: Hyprctl: new connection from pid 2089
+DEBUG ]: Hyprctl: new connection from pid 2089
+DEBUG ]: Hyprctl: new connection from pid 2089
+DEBUG ]: Hyprctl: new connection from pid 2089
+DEBUG ]: Hyprctl: new connection from pid 2089
+DEBUG ]: [CGammaControl] setGamma for DP-4
+DEBUG ]: [CGammaControl] setting to monitor DP-4
+DEBUG ]: Hyprctl: new connection from pid 6946
+DEBUG ]: Hyprctl: new connection from pid 6948
+DEBUG ]: Hyprctl: new connection from pid 6951
+DEBUG ]: Hyprctl: new connection from pid 6959
+DEBUG ]: Hyprctl: new connection from pid 6961
+DEBUG ]: Hyprctl: new connection from pid 6964
+DEBUG ]: Hyprctl: new connection from pid 6978
+DEBUG ]: Hyprctl: new connection from pid 6980
+DEBUG ]: Hyprctl: new connection from pid 6983
+DEBUG ]: Hyprctl: new connection from pid 7006
+DEBUG ]: Hyprctl: new connection from pid 7008
+DEBUG ]: Hyprctl: new connection from pid 7011
+DEBUG ]: Hyprctl: new connection from pid 7016
+DEBUG ]: Hyprctl: new connection from pid 7018
+DEBUG ]: Hyprctl: new connection from pid 7021
+DEBUG ]: [CGammaControl] setGamma for DP-4
+DEBUG ]: [CGammaControl] setting to monitor DP-4
+DEBUG ]: Hyprctl: new connection from pid 7033
+DEBUG ]: Hyprctl: new connection from pid 7035
+DEBUG ]: Hyprctl: new connection from pid 7038
+DEBUG ]: Keybind triggered, calling dispatcher (64, , 108, exec)
+DEBUG ]: Executing layout-resize grow
+DEBUG ]: Process Created with pid 7052
+DEBUG ]: Keybind triggered, calling dispatcher (64, , 108, exec)
+DEBUG ]: Executing hyprlock
+DEBUG ]: Process Created with pid 7053
+DEBUG ]: Hyprctl: new connection from pid 7055
+DEBUG ]: Hyprctl: new connection from pid 7057
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