最近 Vivaldi とか Slack が Linux と GNOME でよく刺さる [一応解決?]

先一昨日にカーネルアップデートをして ArchLinux のカーネルが 4.13.2-1-zen になった。
一昨日と昨日はあんまり触ってなくて,今日触ってたら,Vivaldi とか Slack でよく刺さるようになってしまった。
メモリ不足で Wayland のセッションが OOM かなんかに回収されて再起動するときの挙動に似てたので最初は気にしなかったのだが,
なんか復活したセッションがまたクラッシュした上にリカバリできなくなって X に fallback するようになった。

これはマズい挙動なのでは?
とりあえず journalctl をみてみる。

9月 21 12:57:06 Susanowo kernel: DMAR: DRHD: handling fault status reg 2
9月 21 12:57:06 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr 1327000 [fault reason 23] Unknown
9月 21 12:57:06 Susanowo kernel: DMAR: DRHD: handling fault status reg 2
9月 21 12:57:06 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr 132d000 [fault reason 23] Unknown
9月 21 12:57:06 Susanowo kernel: DMAR: DRHD: handling fault status reg 2
9月 21 12:57:06 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr 50000 [fault reason 23] Unknown
9月 21 12:57:06 Susanowo kernel: DMAR: DRHD: handling fault status reg 2
9月 21 12:57:06 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr 53000 [fault reason 23] Unknown
9月 21 12:57:06 Susanowo kernel: DMAR: DRHD: handling fault status reg 2
9月 21 12:57:06 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr 55000 [fault reason 23] Unknown
9月 21 12:57:06 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr 56000 [fault reason 23] Unknown
9月 21 12:57:06 Susanowo kernel: DMAR: DRHD: handling fault status reg 2
9月 21 12:57:06 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr 58000 [fault reason 23] Unknown
9月 21 12:57:06 Susanowo kernel: DMAR: DRHD: handling fault status reg 2
9月 21 12:57:06 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr 5b000 [fault reason 23] Unknown
9月 21 12:57:06 Susanowo kernel: DMAR: DRHD: handling fault status reg 2
9月 21 12:57:06 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr 5e000 [fault reason 23] Unknown
9月 21 12:57:06 Susanowo kernel: DMAR: DRHD: handling fault status reg 2
9月 21 12:57:06 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr 13a7000 [fault reason 23] Unknown
9月 21 12:57:15 Susanowo kernel: drm/i915: Resetting chip after gpu hang
9月 21 12:57:15 Susanowo kernel: dmar_fault: 4 callbacks suppressed
9月 21 12:57:15 Susanowo kernel: DMAR: DRHD: handling fault status reg 3
9月 21 12:57:15 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr 13af000 [fault reason 23] Unknown
9月 21 12:57:16 Susanowo kernel: asynchronous wait on fence i915:gnome-shell[7267]/1:cd5 timed out
9月 21 12:57:23 Susanowo kernel: drm/i915: Resetting chip after gpu hang
9月 21 12:57:23 Susanowo kernel: DMAR: DRHD: handling fault status reg 3
9月 21 12:57:23 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr 1367000 [fault reason 23] Unknown
9月 21 12:57:23 Susanowo kernel: DMAR: DRHD: handling fault status reg 3
9月 21 12:57:23 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr 2b0a000 [fault reason 23] Unknown
9月 21 12:57:31 Susanowo kernel: drm/i915: Resetting chip after gpu hang
9月 21 12:57:31 Susanowo kernel: DMAR: DRHD: handling fault status reg 3
9月 21 12:57:31 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr 2c3a000 [fault reason 23] Unknown
9月 21 12:57:41 Susanowo kernel: drm/i915: Resetting chip after gpu hang
9月 21 12:57:41 Susanowo kernel: DMAR: DRHD: handling fault status reg 3
9月 21 12:57:41 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr 50000 [fault reason 23] Unknown
9月 21 12:57:49 Susanowo kernel: drm/i915: Resetting chip after gpu hang
9月 21 12:57:52 Susanowo kernel: asynchronous wait on fence i915:gnome-shell[7267]/1:cd6 timed out
9月 21 12:57:57 Susanowo kernel: drm/i915: Resetting chip after gpu hang
9月 21 12:57:57 Susanowo kernel: DMAR: DRHD: handling fault status reg 3
9月 21 12:57:57 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr 13a7000 [fault reason 23] Unknown
9月 21 12:57:57 Susanowo org.gnome.Shell.desktop[7267]: libinput error: libinput bug: timer: offset negative (-2549704)
9月 21 12:57:57 Susanowo org.gnome.Shell.desktop[7267]: libinput error: libinput bug: timer: offset negative (-2008876)
9月 21 12:57:57 Susanowo org.gnome.Shell.desktop[7267]: libinput error: libinput bug: timer: offset negative (-1845024)
9月 21 12:58:07 Susanowo kernel: asynchronous wait on fence i915:gnome-shell[7267]/1:cd7 timed out
9月 21 12:58:13 Susanowo kernel: drm/i915: Resetting chip after gpu hang
9月 21 12:58:21 Susanowo kernel: drm/i915: Resetting chip after gpu hang
9月 21 12:58:21 Susanowo vivaldi-snapshot.desktop[8300]: intel_do_flush_locked failed: Input/output error
9月 21 12:58:21 Susanowo vivaldi-snapshot.desktop[8300]: [8300:8300:0921/125821.885119:ERROR:gpu_process_transport_factory.cc(930)] Lost UI shared context.
9月 21 12:58:21 Susanowo kernel: DMAR: DRHD: handling fault status reg 3
9月 21 12:58:21 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr 6b88000 [fault reason 23] Unknown
9月 21 12:58:22 Susanowo kernel: DMAR: DRHD: handling fault status reg 3
9月 21 12:58:22 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr 2198000 [fault reason 23] Unknown
9月 21 12:58:29 Susanowo kernel: drm/i915: Resetting chip after gpu hang
9月 21 12:58:29 Susanowo kernel: DMAR: DRHD: handling fault status reg 3
9月 21 12:58:29 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr 6b88000 [fault reason 23] Unknown
9月 21 12:58:37 Susanowo kernel: drm/i915: Resetting chip after gpu hang
9月 21 12:58:37 Susanowo kernel: DMAR: DRHD: handling fault status reg 3
9月 21 12:58:37 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr be5000 [fault reason 23] Unknown
9月 21 12:58:45 Susanowo kernel: drm/i915: Resetting chip after gpu hang
9月 21 12:58:45 Susanowo kernel: DMAR: DRHD: handling fault status reg 3
9月 21 12:58:45 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr 1145000 [fault reason 23] Unknown
9月 21 12:58:45 Susanowo kernel: DMAR: DRHD: handling fault status reg 2
9月 21 12:58:45 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr 114c000 [fault reason 23] Unknown
9月 21 12:58:48 Susanowo kernel: asynchronous wait on fence i915:gnome-shell[7267]/1:ce3 timed out
9月 21 12:58:53 Susanowo kernel: drm/i915: Resetting chip after gpu hang
9月 21 12:58:53 Susanowo kernel: DMAR: DRHD: handling fault status reg 3
9月 21 12:58:53 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr 118e000 [fault reason 23] Unknown
9月 21 12:59:01 Susanowo kernel: drm/i915: Resetting chip after gpu hang
9月 21 12:59:01 Susanowo kernel: DMAR: DRHD: handling fault status reg 2
9月 21 12:59:01 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr 1359000 [fault reason 23] Unknown
9月 21 12:59:01 Susanowo kernel: DMAR: DRHD: handling fault status reg 2
9月 21 12:59:01 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr 135f000 [fault reason 23] Unknown
9月 21 12:59:09 Susanowo kernel: drm/i915: Resetting chip after gpu hang
9月 21 12:59:17 Susanowo kernel: drm/i915: Resetting chip after gpu hang
9月 21 12:59:25 Susanowo kernel: drm/i915: Resetting chip after gpu hang
9月 21 12:59:25 Susanowo kernel: DMAR: DRHD: handling fault status reg 3
9月 21 12:59:25 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr d3d000 [fault reason 23] Unknown
9月 21 12:59:25 Susanowo kernel: DMAR: DRHD: handling fault status reg 2
9月 21 12:59:25 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr d43000 [fault reason 23] Unknown
9月 21 12:59:33 Susanowo kernel: drm/i915: Resetting chip after gpu hang
9月 21 12:59:41 Susanowo kernel: drm/i915: Resetting chip after gpu hang
9月 21 12:59:41 Susanowo kernel: DMAR: DRHD: handling fault status reg 3
9月 21 12:59:41 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr e11000 [fault reason 23] Unknown
9月 21 12:59:41 Susanowo kernel: DMAR: DRHD: handling fault status reg 2
9月 21 12:59:41 Susanowo kernel: DMAR: [DMA Write] Request device [00:02.0] fault addr e18000 [fault reason 23] Unknown
9月 21 12:59:49 Susanowo kernel: drm/i915: Resetting chip after gpu hang
9月 21 12:59:52 Susanowo kernel: asynchronous wait on fence i915:gnome-shell[7267]/1:ce6 timed out
9月 21 12:59:57 Susanowo kernel: drm/i915: Resetting chip after gpu hang
9月 21 13:00:05 Susanowo kernel: drm/i915: Resetting chip after gpu hang
9月 21 13:00:05 Susanowo kernel: [drm:i915_reset [i915]] *ERROR* GPU recovery failed
9月 21 13:00:05 Susanowo org.gnome.Shell.desktop[7267]: intel_do_flush_locked failed: Input/output error
9月 21 13:00:05 Susanowo gnome-calendar[8214]: Error reading events from display: Broken pipe
9月 21 13:00:05 Susanowo python3[8230]: Error reading events from display: Broken pipe
9月 21 13:00:05 Susanowo evolution-alarm[7515]: Error reading events from display: Broken pipe
9月 21 13:00:05 Susanowo gnome-session[7233]: gnome-session-binary[7233]: WARNING: App 'org.gnome.Shell.desktop' exited with code 1
9月 21 13:00:05 Susanowo pulseaudio[7302]: ICE default IO error handler doing an exit(), pid = 7302, errno = 11
9月 21 13:00:05 Susanowo dropbox.desktop[7530]: ICE default IO error handler doing an exit(), pid = 7699, errno = 11
9月 21 13:00:05 Susanowo mendeleydesktop.desktop[8936]: ICE default IO error handler doing an exit(), pid = 8956, errno = 11
9月 21 13:00:05 Susanowo gnome-session-binary[7233]: Unrecoverable failure in required component org.gnome.Shell.desktop
9月 21 13:00:05 Susanowo gnome-session-binary[7233]: WARNING: App 'org.gnome.Shell.desktop' exited with code 1
9月 21 13:00:05 Susanowo polkitd[589]: Unregistered Authentication Agent for unix-session:c4 (system bus name :1.626, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8) (disconnected from bus)
9月 21 13:00:05 Susanowo systemd[7216]: pulseaudio.service: Main process exited, code=exited, status=1/FAILURE
9月 21 13:00:05 Susanowo systemd[7216]: pulseaudio.service: Unit entered failed state.
9月 21 13:00:05 Susanowo systemd[7216]: pulseaudio.service: Failed with result 'exit-code'.
9月 21 13:00:05 Susanowo bluetoothd[747]: Endpoint unregistered: sender=:1.628 path=/MediaEndpoint/A2DPSource
9月 21 13:00:05 Susanowo bluetoothd[747]: Endpoint unregistered: sender=:1.628 path=/MediaEndpoint/A2DPSink
9月 21 13:00:05 Susanowo mendeleydesktop.desktop[8936]: virtual HtmlLocalStorageFactory::~HtmlLocalStorageFactory() 4 storages not deleted
9月 21 13:00:05 Susanowo org.a11y.atspi.Registry[7296]: XIO: fatal IO error 11 (Resource temporarily unavailable) on X server ":0"
9月 21 13:00:05 Susanowo org.a11y.atspi.Registry[7296]: after 499 requests (499 known processed) with 0 events remaining.
9月 21 13:00:05 Susanowo gdm-password][7213]: pam_unix(gdm-password:session): session closed for user orumin
9月 21 13:00:05 Susanowo ibus-daemon[7331]: GChildWatchSource: Exit status of a child process was requested but ECHILD was received by waitpid(). Most likely the process is ignoring SIGCHLD, or some other thread is invoking waitpid() with a nonpositive first argument; either behavior can break applications that use g_child_watch_add()/g_spawn_sync() either directly or indirectly.
9月 21 13:00:05 Susanowo ibus-daemon[7331]: GChildWatchSource: Exit status of a child process was requested but ECHILD was received by waitpid(). Most likely the process is ignoring SIGCHLD, or some other thread is invoking waitpid() with a nonpositive first argument; either behavior can break applications that use g_child_watch_add()/g_spawn_sync() either directly or indirectly.
9月 21 13:00:05 Susanowo ibus-daemon[7331]: GChildWatchSource: Exit status of a child process was requested but ECHILD was received by waitpid(). Most likely the process is ignoring SIGCHLD, or some other thread is invoking waitpid() with a nonpositive first argument; either behavior can break applications that use g_child_watch_add()/g_spawn_sync() either directly or indirectly.
9月 21 13:00:05 Susanowo ibus-daemon[7331]: GChildWatchSource: Exit status of a child process was requested but ECHILD was received by waitpid(). Most likely the process is ignoring SIGCHLD, or some other thread is invoking waitpid() with a nonpositive first argument; either behavior can break applications that use g_child_watch_add()/g_spawn_sync() either directly or indirectly.
9月 21 13:00:05 Susanowo org.gnome.Shell.desktop[7267]: could not connect to wayland server
9月 21 13:00:05 Susanowo org.gnome.Shell.desktop[7267]: (EE)
9月 21 13:00:05 Susanowo org.gnome.Shell.desktop[7267]: Fatal server error:
9月 21 13:00:05 Susanowo org.gnome.Shell.desktop[7267]: (EE) Couldn't add screen
9月 21 13:00:05 Susanowo org.gnome.Shell.desktop[7267]: (EE)
9月 21 13:00:06 Susanowo systemd[7216]: pulseaudio.service: Service hold-off time over, scheduling restart.
9月 21 13:00:06 Susanowo systemd[7216]: Stopped Sound Service.
9月 21 13:00:06 Susanowo systemd[7216]: Starting Sound Service...
9月 21 13:00:06 Susanowo rtkit-daemon[814]: Successfully made thread 9769 of process 9769 (/usr/bin/pulseaudio) owned by '1000' high priority at nice level -11.
9月 21 13:00:06 Susanowo rtkit-daemon[814]: Supervising 1 threads of 1 processes of 1 users.
9月 21 13:00:06 Susanowo pulseaudio[9769]: W: [pulseaudio] pid.c: Stale PID file, overwriting.
9月 21 13:00:06 Susanowo systemd[7216]: Started Sound Service.
9月 21 13:00:06 Susanowo bluetoothd[747]: Endpoint registered: sender=:1.1021 path=/MediaEndpoint/A2DPSource
9月 21 13:00:06 Susanowo bluetoothd[747]: Endpoint registered: sender=:1.1021 path=/MediaEndpoint/A2DPSink
9月 21 13:00:06 Susanowo bluetoothd[747]: RFCOMM server failed for Headset Voice gateway: rfcomm_bind: Address already in use (98)
9月 21 13:00:06 Susanowo pulseaudio[9769]: E: [pulseaudio] backend-ofono.c: Failed to register as a handsfree audio agent with ofono: org.freedesktop.DBus.Error.ServiceUnknown: The name org.ofono was not provided by any .service files
9月 21 13:00:06 Susanowo bluetoothd[747]: RFCOMM server failed for :1.1021/Profile/HSPHSProfile/00001108-0000-1000-8000-00805f9b34fb: rfcomm_bind: Address already in use (98)
9月 21 13:00:06 Susanowo dbus[444]: [system] Rejected send message, 0 matched rules; type="error", sender=":1.2" (uid=0 pid=441 comm="/usr/lib/systemd/systemd-logind ") interface="(unset)" member="(unset)" error name="org.freedesktop.DBus.Error.UnknownMethod" requested_reply="0" destination=":1.31" (uid=120 pid=726 comm="/usr/bin/gnome-shell ")
9月 21 13:00:06 Susanowo systemd-logind[441]: Removed session c4.
9月 21 13:00:06 Susanowo systemd[1]: Stopping User Manager for UID 1000...
9月 21 13:00:06 Susanowo systemd[7216]: Stopping Virtual filesystem service...
9月 21 13:00:06 Susanowo systemd[7216]: Stopping Virtual filesystem service - Apple File Conduit monitor...
9月 21 13:00:06 Susanowo gpg-agent[8409]: SIGTERM received - shutting down ...
9月 21 13:00:06 Susanowo systemd[7216]: Stopping Evolution source registry...
9月 21 13:00:06 Susanowo systemd[7216]: Stopped target Default.
9月 21 13:00:06 Susanowo systemd[7216]: Stopping GnuPG cryptographic agent and passphrase cache...
9月 21 13:00:06 Susanowo systemd[7216]: Stopping Evolution calendar service...
9月 21 13:00:06 Susanowo systemd[7216]: Stopping Accessibility services bus...
9月 21 13:00:06 Susanowo systemd[7216]: Stopping Virtual filesystem service - GNOME Online Accounts monitor...
9月 21 13:00:06 Susanowo systemd[7216]: Stopping Virtual filesystem service - disk device monitor...
9月 21 13:00:06 Susanowo systemd[7216]: Stopping D-Bus User Message Bus...
9月 21 13:00:06 Susanowo systemd[7216]: Stopping Tracker metadata database store and lookup manager...
9月 21 13:00:06 Susanowo systemd[7216]: Stopping Virtual filesystem service - digital camera monitor...
9月 21 13:00:06 Susanowo systemd[7216]: Stopping Virtual filesystem service - Media Transfer Protocol monitor...
9月 21 13:00:06 Susanowo systemd[7216]: Stopping Sound Service...
9月 21 13:00:06 Susanowo systemd[7216]: Stopping sandboxed app permission store...
9月 21 13:00:06 Susanowo systemd[7216]: Stopping Evolution address book service...
9月 21 13:00:06 Susanowo systemd[7216]: Stopping Virtual filesystem metadata service...
9月 21 13:00:06 Susanowo systemd[7216]: Stopped sandboxed app permission store.
9月 21 13:00:06 Susanowo systemd[7216]: Stopped Virtual filesystem metadata service.
9月 21 13:00:06 Susanowo systemd[7216]: Stopped Virtual filesystem service - Media Transfer Protocol monitor.
9月 21 13:00:06 Susanowo systemd[7216]: Stopped Virtual filesystem service - digital camera monitor.
9月 21 13:00:06 Susanowo systemd[7216]: Stopped Virtual filesystem service - GNOME Online Accounts monitor.
9月 21 13:00:06 Susanowo dbus[444]: [system] Rejected send message, 0 matched rules; type="error", sender=":1.2" (uid=0 pid=441 comm="/usr/lib/systemd/systemd-logind ") interface="(unset)" member="(unset)" error name="org.freedesktop.DBus.Error.UnknownMethod" requested_reply="0" destination=":1.31" (uid=120 pid=726 comm="/usr/bin/gnome-shell ")
9月 21 13:00:06 Susanowo dbus[444]: [system] Rejected send message, 0 matched rules; type="error", sender=":1.2" (uid=0 pid=441 comm="/usr/lib/systemd/systemd-logind ") interface="(unset)" member="(unset)" error name="org.freedesktop.DBus.Error.UnknownMethod" requested_reply="0" destination=":1.31" (uid=120 pid=726 comm="/usr/bin/gnome-shell ")
9月 21 13:00:06 Susanowo tracker-store[7531]: Received signal:15->'Terminated'
9月 21 13:00:06 Susanowo tracker-store[7531]: OK
9月 21 13:00:06 Susanowo dbus[444]: [system] Rejected send message, 0 matched rules; type="error", sender=":1.2" (uid=0 pid=441 comm="/usr/lib/systemd/systemd-logind ") interface="(unset)" member="(unset)" error name="org.freedesktop.DBus.Error.UnknownMethod" requested_reply="0" destination=":1.31" (uid=120 pid=726 comm="/usr/bin/gnome-shell ")
9月 21 13:00:06 Susanowo gpg-agent[8409]: gpg-agent (GnuPG) 2.2.0 stopped
9月 21 13:00:06 Susanowo systemd[7216]: Stopped D-Bus User Message Bus.
9月 21 13:00:06 Susanowo systemd[7216]: Stopped Evolution calendar service.
9月 21 13:00:06 Susanowo systemd[7216]: Stopped Evolution source registry.
9月 21 13:00:06 Susanowo systemd[7216]: Stopped Virtual filesystem service - disk device monitor.
9月 21 13:00:06 Susanowo systemd[7216]: Stopped Virtual filesystem service - Apple File Conduit monitor.
9月 21 13:00:06 Susanowo systemd[7216]: Stopped Tracker metadata database store and lookup manager.
9月 21 13:00:06 Susanowo systemd[7216]: Stopped Evolution address book service.
9月 21 13:00:06 Susanowo bluetoothd[747]: Endpoint unregistered: sender=:1.1021 path=/MediaEndpoint/A2DPSource
9月 21 13:00:06 Susanowo systemd[7216]: Stopped GnuPG cryptographic agent and passphrase cache.
9月 21 13:00:06 Susanowo bluetoothd[747]: Endpoint unregistered: sender=:1.1021 path=/MediaEndpoint/A2DPSink
9月 21 13:00:06 Susanowo systemd[7216]: Stopped Accessibility services bus.
9月 21 13:00:06 Susanowo dbus[444]: [system] Rejected send message, 0 matched rules; type="error", sender=":1.2" (uid=0 pid=441 comm="/usr/lib/systemd/systemd-logind ") interface="(unset)" member="(unset)" error name="org.freedesktop.DBus.Error.UnknownMethod" requested_reply="0" destination=":1.31" (uid=120 pid=726 comm="/usr/bin/gnome-shell ")
9月 21 13:00:06 Susanowo dbus[444]: [system] Rejected send message, 0 matched rules; type="error", sender=":1.2" (uid=0 pid=441 comm="/usr/lib/systemd/systemd-logind ") interface="(unset)" member="(unset)" error name="org.freedesktop.DBus.Error.UnknownMethod" requested_reply="0" destination=":1.31" (uid=120 pid=726 comm="/usr/bin/gnome-shell ")
9月 21 13:00:06 Susanowo systemd[7216]: Stopped Sound Service.
9月 21 13:00:06 Susanowo dbus[444]: [system] Rejected send message, 0 matched rules; type="error", sender=":1.2" (uid=0 pid=441 comm="/usr/lib/systemd/systemd-logind ") interface="(unset)" member="(unset)" error name="org.freedesktop.DBus.Error.UnknownMethod" requested_reply="0" destination=":1.31" (uid=120 pid=726 comm="/usr/bin/gnome-shell ")
9月 21 13:00:06 Susanowo dbus[444]: [system] Rejected send message, 0 matched rules; type="error", sender=":1.2" (uid=0 pid=441 comm="/usr/lib/systemd/systemd-logind ") interface="(unset)" member="(unset)" error name="org.freedesktop.DBus.Error.UnknownMethod" requested_reply="0" destination=":1.31" (uid=120 pid=726 comm="/usr/bin/gnome-shell ")
9月 21 13:00:06 Susanowo dbus[444]: [system] Rejected send message, 0 matched rules; type="error", sender=":1.2" (uid=0 pid=441 comm="/usr/lib/systemd/systemd-logind ") interface="(unset)" member="(unset)" error name="org.freedesktop.DBus.Error.UnknownMethod" requested_reply="0" destination=":1.31" (uid=120 pid=726 comm="/usr/bin/gnome-shell ")
9月 21 13:00:06 Susanowo systemd[7216]: Stopped Virtual filesystem service.
9月 21 13:00:06 Susanowo systemd[7216]: Stopped target Basic System.
9月 21 13:00:06 Susanowo systemd[7216]: Stopped target Sockets.
9月 21 13:00:06 Susanowo systemd[7216]: Closed GnuPG cryptographic agent and passphrase cache (restricted).
9月 21 13:00:06 Susanowo systemd[7216]: Closed GnuPG cryptographic agent and passphrase cache.
9月 21 13:00:06 Susanowo systemd[7216]: Closed Sound System.
9月 21 13:00:06 Susanowo systemd[7216]: Closed GnuPG cryptographic agent (ssh-agent emulation).
9月 21 13:00:06 Susanowo systemd[7216]: Closed D-Bus User Message Bus Socket.
9月 21 13:00:06 Susanowo systemd[7216]: Closed GnuPG network certificate management daemon.
9月 21 13:00:06 Susanowo systemd[7216]: Closed GnuPG cryptographic agent and passphrase cache (access for web browsers).
9月 21 13:00:06 Susanowo systemd[7216]: Stopped target Timers.
9月 21 13:00:06 Susanowo systemd[7216]: Stopped target Paths.
9月 21 13:00:06 Susanowo systemd[7216]: Reached target Shutdown.
9月 21 13:00:06 Susanowo systemd[7216]: Starting Exit the Session...
9月 21 13:00:06 Susanowo systemd[7216]: Received SIGRTMIN+24 from PID 9777 (kill).
9月 21 13:00:06 Susanowo systemd[7217]: pam_unix(systemd-user:session): session closed for user orumin
9月 21 13:00:06 Susanowo systemd[1]: Stopped User Manager for UID 1000.
9月 21 13:00:06 Susanowo systemd[1]: Removed slice User Slice of orumin.
9月 21 13:00:06 Susanowo dbus[444]: [system] Rejected send message, 0 matched rules; type="error", sender=":1.2" (uid=0 pid=441 comm="/usr/lib/systemd/systemd-logind ") interface="(unset)" member="(unset)" error name="org.freedesktop.DBus.Error.UnknownMethod" requested_reply="0" destination=":1.31" (uid=120 pid=726 comm="/usr/bin/gnome-shell ")
9月 21 13:00:06 Susanowo dbus[444]: [system] Rejected send message, 0 matched rules; type="error", sender=":1.2" (uid=0 pid=441 comm="/usr/lib/systemd/systemd-logind ") interface="(unset)" member="(unset)" error name="org.freedesktop.DBus.Error.UnknownMethod" requested_reply="0" destination=":1.31" (uid=120 pid=726 comm="/usr/bin/gnome-shell ")
9月 21 13:00:06 Susanowo dbus[444]: [system] Rejected send message, 0 matched rules; type="error", sender=":1.2" (uid=0 pid=441 comm="/usr/lib/systemd/systemd-logind ") interface="(unset)" member="(unset)" error name="org.freedesktop.DBus.Error.UnknownMethod" requested_reply="0" destination=":1.31" (uid=120 pid=726 comm="/usr/bin/gnome-shell ")
9月 21 13:00:06 Susanowo dbus[444]: [system] Rejected send message, 0 matched rules; type="error", sender=":1.2" (uid=0 pid=441 comm="/usr/lib/systemd/systemd-logind ") interface="(unset)" member="(unset)" error name="org.freedesktop.DBus.Error.UnknownMethod" requested_reply="0" destination=":1.31" (uid=120 pid=726 comm="/usr/bin/gnome-shell ")
9月 21 13:00:06 Susanowo dbus[444]: [system] Rejected send message, 0 matched rules; type="error", sender=":1.2" (uid=0 pid=441 comm="/usr/lib/systemd/systemd-logind ") interface="(unset)" member="(unset)" error name="org.freedesktop.DBus.Error.UnknownMethod" requested_reply="0" destination=":1.31" (uid=120 pid=726 comm="/usr/bin/gnome-shell ")
9月 21 13:00:06 Susanowo dbus[444]: [system] Rejected send message, 0 matched rules; type="error", sender=":1.2" (uid=0 pid=441 comm="/usr/lib/systemd/systemd-logind ") interface="(unset)" member="(unset)" error name="org.freedesktop.DBus.Error.UnknownMethod" requested_reply="0" destination=":1.31" (uid=120 pid=726 comm="/usr/bin/gnome-shell ")
9月 21 13:00:06 Susanowo dbus[444]: [system] Rejected send message, 0 matched rules; type="error", sender=":1.2" (uid=0 pid=441 comm="/usr/lib/systemd/systemd-logind ") interface="(unset)" member="(unset)" error name="org.freedesktop.DBus.Error.UnknownMethod" requested_reply="0" destination=":1.31" (uid=120 pid=726 comm="/usr/bin/gnome-shell ")
9月 21 13:00:06 Susanowo org.gnome.Shell.desktop[726]: intel_do_flush_locked failed: Input/output error
9月 21 13:00:06 Susanowo gnome-shell[726]: g_dbus_connection_signal_unsubscribe: assertion 'G_IS_DBUS_CONNECTION (connection)' failed
9月 21 13:00:06 Susanowo gnome-shell[726]: g_dbus_connection_signal_unsubscribe: assertion 'G_IS_DBUS_CONNECTION (connection)' failed
9月 21 13:00:06 Susanowo gnome-shell[726]: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
9月 21 13:00:06 Susanowo gnome-shell[726]: g_dbus_connection_signal_unsubscribe: assertion 'G_IS_DBUS_CONNECTION (connection)' failed
9月 21 13:00:06 Susanowo gnome-shell[726]: g_dbus_connection_signal_unsubscribe: assertion 'G_IS_DBUS_CONNECTION (connection)' failed
9月 21 13:00:06 Susanowo gnome-shell[726]: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
9月 21 13:00:06 Susanowo gnome-shell[726]: g_dbus_connection_signal_unsubscribe: assertion 'G_IS_DBUS_CONNECTION (connection)' failed
9月 21 13:00:06 Susanowo gnome-shell[726]: g_dbus_connection_signal_unsubscribe: assertion 'G_IS_DBUS_CONNECTION (connection)' failed
9月 21 13:00:06 Susanowo gnome-shell[726]: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
9月 21 13:00:06 Susanowo org.gnome.Shell.desktop[726]: (EE)
9月 21 13:00:06 Susanowo org.gnome.Shell.desktop[726]: Fatal server error:
9月 21 13:00:06 Susanowo org.gnome.Shell.desktop[726]: (EE) failed to read Wayland events: Broken pipe
9月 21 13:00:06 Susanowo org.gnome.Shell.desktop[726]: (EE)
盛大に壊れてる。

で,エラーメッセージで調べたところ(調べようとして Vivaldi を起動してまた刺してしまって,最終的に reboot してから Windows で調べた),
89360 – [bdw-u iommu] DMAR error -> GPU hang https://bugs.freedesktop.org/show_bug.cgi?id=89360
はい,バグですね。
そういえば使ってるマシンは VAIO Pro 13 | mk2 の,Core i5 モデルなので,Broadwell であり,GPU は Intel HD Graphics 5500 だ。
ビンゴである。

Slack のほうも /usr/share/applications/slack.desktop の起動コマンドから --disable-gpu フラグを外してたりしました。はい……。

とりあえず Bugzilla にあった通り,ブートローダーのカーネルコマンドラインに,
intel_iommu=igfx_off
を追加してみたところ,今のところまだ刺さらずにこのブログ記事が Vivaldi で書けている。