i3: Chromium-based applications periodically "freeze"

I’m submitting a…

[x] Bug
[ ] Feature Request
[ ] Documentation Request
[ ] Other (Please describe in detail)

Current Behavior

For the past 2–3 months (but never before then, so perhaps this issue began with the i3 upgrade to 4.16.1 on 27 Jan 2019), Chromium-based applications such as qutebrowser and Slack will periodically “freeze”, requiring a SIGKILL and restart. I’ll be able to move my cursor across the application window, but it won’t respond to input from the keyboard or mouse. If I switch to another workspace and then back again, the frozen application’s window won’t be redrawn—that window will simply continue to display whatever was on the last workspace I just switched from. Affected applications tend to display this behavior at the same time. I’ve been monitoring application-specific logs without finding any clues to the root cause. This issue appears to be related to #1720.

Expected Behavior

Applications should not freeze.

Reproduction Instructions

I’ve not been able to trigger this issue manually. It’s quite unpredictable. I can go days without it happening—but sometimes, it’ll occur several times back-to-back with no apparent cause.

Environment

Output of i3 --moreversion 2>&-:

i3 version: 4.16.1 (2019-01-27)

set $mod Mod4
font pango:monospace 8
floating_modifier $mod
bindsym $mod+Return exec "$HOME/.config/i3/cwd.sh"
bindsym $mod+Shift+q kill
bindsym $mod+d exec dmenu_run
bindsym $mod+h focus left
bindsym $mod+j focus down
bindsym $mod+k focus up
bindsym $mod+l focus right
bindsym $mod+Left focus left
bindsym $mod+Down focus down
bindsym $mod+Up focus up
bindsym $mod+Right focus right
bindsym $mod+Shift+h move left
bindsym $mod+Shift+j move down
bindsym $mod+Shift+k move up
bindsym $mod+Shift+l move right
bindsym $mod+Shift+Left move left
bindsym $mod+Shift+Down move down
bindsym $mod+Shift+Up move up
bindsym $mod+Shift+Right move right
bindsym $mod+g split h
bindsym $mod+v split v
bindsym $mod+f fullscreen toggle
bindsym $mod+s layout stacking
bindsym $mod+w layout tabbed
bindsym $mod+e layout toggle split
bindsym $mod+Shift+space floating toggle
bindsym $mod+space focus mode_toggle
bindsym $mod+a focus parent
set $ws1 "term"
set $ws2 "web"
set $ws3 "chat"
set $ws4 "edit"
set $ws5 "read"
set $ws6 "vm"
set $ws7 "vnc"
set $ws8 "8"
set $ws9 "9"
set $ws10 "10"
bindsym $mod+1 workspace $ws1
bindsym $mod+2 workspace $ws2
bindsym $mod+3 workspace $ws3
bindsym $mod+4 workspace $ws4
bindsym $mod+5 workspace $ws5
bindsym $mod+6 workspace $ws6
bindsym $mod+7 workspace $ws7
bindsym $mod+8 workspace $ws8
bindsym $mod+9 workspace $ws9
bindsym $mod+0 workspace $ws10
bindsym $mod+Shift+1 move container to workspace $ws1
bindsym $mod+Shift+2 move container to workspace $ws2
bindsym $mod+Shift+3 move container to workspace $ws3
bindsym $mod+Shift+4 move container to workspace $ws4
bindsym $mod+Shift+5 move container to workspace $ws5
bindsym $mod+Shift+6 move container to workspace $ws6
bindsym $mod+Shift+7 move container to workspace $ws7
bindsym $mod+Shift+8 move container to workspace $ws8
bindsym $mod+Shift+9 move container to workspace $ws9
bindsym $mod+Shift+0 move container to workspace $ws10
bindsym $mod+Shift+c reload
bindsym $mod+Shift+r restart
bindsym $mod+Shift+t exec "$HOME/.config/i3blocks/update.sh"
bindsym $mod+Shift+e exec "i3-nagbar -t warning -m 'You pressed the exit shortcut. Do you really want to exit i3? This will end your X session.' -b 'Yes, exit i3' 'i3-msg exit'"
mode "resize" {
        bindsym h resize shrink width 10 px or 10 ppt
        bindsym j resize grow height 10 px or 10 ppt
        bindsym k resize shrink height 10 px or 10 ppt
        bindsym l resize grow width 10 px or 10 ppt
        bindsym Left resize shrink width 10 px or 10 ppt
        bindsym Down resize grow height 10 px or 10 ppt
        bindsym Up resize shrink height 10 px or 10 ppt
        bindsym Right resize grow width 10 px or 10 ppt
        bindsym Return mode "default"
        bindsym Escape mode "default"
        bindsym $mod+r mode "default"
}
bindsym $mod+r mode "resize"
bar {
        status_command i3blocks
	      tray_output none
        font pango:source code pro, 9
}
gaps inner 10
gaps outer 5
bindsym XF86AudioMute         exec amixer -q set Master toggle;      exec pkill -RTMIN+10 i3blocks
bindsym XF86AudioRaiseVolume  exec amixer -q set Master 2dB+ unmute; exec pkill -RTMIN+10 i3blocks
bindsym XF86AudioLowerVolume  exec amixer -q set Master 2dB- unmute; exec pkill -RTMIN+10 i3blocks
bindsym XF86AudioMicMute      exec amixer set Capture toggle;        exec pkill -RTMIN+9 i3blocks
bindsym XF86MonBrightnessDown exec xbacklight -dec 5;                exec pkill -RTMIN+9 i3blocks
bindsym XF86MonBrightnessUp   exec xbacklight -inc 5;                exec pkill -RTMIN+9 i3blocks
exec --no-startup-id feh --bg-fill $HOME/.config/img.png
new_window 1pixel
bindsym $mod+shift+z exec i3lock -tfi $HOME/.config/img.png
exec --no-startup-id redshift -l `cat $HOME/.config/i3blocks/coord.txt | tr -d '\n'` &
exec --no-startup-id $HOME/.dropbox-dist/dropboxd &
bindsym Shift+$mod+bracketright move workspace to output right
bindsym Shift+$mod+bracketleft move workspace to output left

- Linux Distribution & Version: 5.0.7-arch1-1-ARCH x86_64
- Are you using a compositor (e.g., xcompmgr or compton): No