This bug bit again friday evening. Same symptoms, was watching video, screen
froze, mouse can move cursor but cursor shape and window borders do not change
as they should as the cursor is moved in and out of windows, mouse clicks and
keystrokes including ctl-alt-F2 and ctl-alt-F3 are ineffective, i logged in via
ssh, attached to tmux, htop (sorted by TIME+) shows Xorg stuck consuming lots
of CPU:
0 [|||||||||||||||||||||||||||||| 61.9%] Tasks: 54; 2 running
1 [||||||||||||||||||||||| 45.2%] Load average: 1.27 1.14
1.11
Mem[||||||||||||||||||||||||||||||||||||1.51G/1.90G] Time: 22:04:23
Swp[||||| 176M/1.86G]
PID START USER VIRT RES NI CPU% TIME+ S Command
1816 20:53 g 3310M 1050M 0 0.0 49:17.71 S
/usr/lib/firefox-esr/plugin-container -greomni /usr/
1713 20:53 g 2507M 405M 0 0.7 27:41.71 S
/usr/lib/firefox-esr/firefox-esr
1214 20:53 g 372M 57148 0 93.5 24:07.23 R /usr/lib/xorg/Xorg
-nolisten tcp :0 vt1 -keeptty -au
1342 20:53 root 27164 1736 0 0.0 6:26.18 S htop
1404 20:53 g 1127M 26564 -11 0.7 3:29.47 S /usr/bin/pulseaudio
--start --log-target=syslog
1410 20:53 g 679M 22360 0 0.0 2:01.45 S pavucontrol
1398 20:53 g 833M 26828 0 0.7 1:21.49 S /usr/bin/python3
/usr/bin/blueman-manager
12728 21:46 root 27020 4224 0 0.7 0:07.77 R htop
1983 06:41 g 97G 26972 0 0.0 0:07.30 S gthumb /home/greg
1439 20:53 g 70772 232 0 0.0 0:06.49 S xclock -geometry --1+-4
-fg green -bg black -update
1253 20:53 g 86452 1764 0 0.0 0:05.13 S xterm
1346 20:53 g 30200 2840 0 0.0 0:04.45 S tmux new -d
1 05:21 root 220M 5236 0 0.0 0:03.61 S /sbin/init
1426 20:53 g 48512 3860 0 0.0 0:03.08 S vncviewer compresslevel=9
qualitylevel=9 ZlibLevel=9
1522 20:53 root 32192 2424 0 0.0 0:01.36 S /bin/bash
1396 20:53 g 48244 156 0 0.0 0:01.29 S ssh
-oHostKeyAlgorithms=ssh-rsa -p38134 -e! 209.240.
601 20:53 root 4632 36 0 0.0 0:01.23 S /usr/sbin/gpm -m
/dev/input/mice -t exps2
1287 20:53 g 86660 2140 0 0.0 0:00.77 S xterm -bg black -fg white
-rightbar -xrm *charClass:
1220 20:53 g 46332 1644 0 0.0 0:00.67 S x-window-manager
F1Help F2Setup F3SearchF4FilterF5Tree F6SortByF7Nice -F8Nice +F9Kill F10Quit
Via htop i killed (signal 15) pulseaudio, pavucontrol, bluetooth-manager,
gthumb, xclock, an xterm, vncviewer, ssh(-client), gpm, and the other xterm,
which all immediately disappeared from htop. When i killed x-window-manager
(twm) it remained showing in htop with Z in the S column. i continued killing,
bluetooth-applet and rtkit disappeared upon kill, ssh-agent remained with Z,
timesyncd and resolved respawned, cron, bluetoothd, polkitd, dhclient, sd-pam,
obexd, and dconf-service all disappeared, i gave signal 9 to x-window-manager
and it disappeared, and signal 15 to firefox-esr/plugin-container and
firefox-esr/firefox-esr and they disappeared. it remained thus all weekend.
this morning htop (sorted by PID) shows Xorg still consuming cpu:
0 [| 0.7%] Tasks: 30; 2 running
1 [|||||||||||||||||||||||||||||||||||||||||100.0%] Load average: 1.07 1.02
1.00
Mem[||||||||||||||||||| 164M/1.90G] Time: 07:50:59
Swp[| 31.5M/1.86G]
PID START USER VIRT RES NI CPU% TIME+ S Command
1 Apr27 root 220M 5444 0 0.0 0:04.09 S /sbin/init
259 Apr27 root 86588 11976 -1 0.0 0:00.41 S
/lib/systemd/systemd-journald
288 Apr27 root 46272 1880 0 0.0 0:00.31 S /lib/systemd/systemd-udevd
570 Apr27 messagebu 50188 948 0 0.0 0:00.14 S /usr/bin/dbus-daemon
--system --address=systemd: --n
572 Apr27 root 70580 1968 0 0.0 0:00.21 S
/lib/systemd/systemd-logind
575 Apr27 syslog 252M 660 0 0.0 0:00.03 S /usr/sbin/rsyslogd -n
702 Apr27 root 76688 20 0 0.0 0:00.02 S /bin/login -p --
703 Apr27 root 72296 5732 0 0.0 0:00.01 S /usr/sbin/sshd -D
1176 Apr27 g 76756 2312 0 0.0 0:00.03 S /lib/systemd/systemd
--user
1187 Apr27 g 22516 0 0 0.0 0:00.03 S -bash
1191 Apr27 g 4628 4 0 0.0 0:00.00 S /bin/sh /usr/bin/startx
1213 Apr27 g 22628 112 0 0.0 0:00.00 S xinit
/etc/X11/xinit/xinitrc -- /etc/X11/xinit/xserv
1214 Apr27 g 372M 75892 0 88.1 30h15:12 R /usr/lib/xorg/Xorg
-nolisten tcp :0 vt1 -keeptty -au
1241 Apr27 g 45704 4 0 0.0 0:00.00 S /usr/bin/dbus-launch
--exit-with-session --sh-syntax
1242 Apr27 g 50028 1408 0 0.0 0:00.05 S /usr/bin/dbus-daemon
--syslog --fork --print-pid 5 -
1346 Apr27 g 30200 3012 0 0.7 0:36.11 S tmux new -d
1347 Apr27 g 29904 4648 0 0.0 0:00.27 S -bash
1373 Apr27 g 28724 2756 0 0.0 0:00.08 S -bash
1499 Apr27 root 61440 20 0 0.0 0:00.08 S sudo -H -uG -s
1522 Apr27 root 32192 2992 0 0.0 0:01.36 S /bin/bash
12741 Apr27 g 55456 9008 0 0.0 0:00.28 S vim
12775 Apr27 systemd-t 138M 3088 0 0.0 0:00.15 S
/lib/systemd/systemd-timesyncd
12779 Apr27 systemd-r 70608 5196 0 0.0 0:00.13 S
/lib/systemd/systemd-resolved
14014 19:31 root 74672 6356 0 0.0 0:00.01 S sshd: g [priv]
14016 19:31 g 74672 3388 0 0.7 0:00.43 S sshd: g@pts/0
14017 19:31 g 28656 6920 0 0.0 0:00.07 S -bash
14053 19:31 g 21220 3456 0 0.0 0:00.00 S tmux set status 0; set
visual-b on; set display-t 99
14054 19:32 g 48136 5768 0 0.0 0:00.08 S ssh
-oHostKeyAlgorithms=ssh-rsa -p38134 -e! 209.240.
14105 20:44 g 28724 7076 0 0.0 0:00.10 S -bash
14930 07:19 root 26700 3924 0 0.0 0:07.49 R htop
F1Help F2Setup F3SearchF4FilterF5Tree F6SortByF7Nice -F8Nice +F9Kill F10Quit
of course there's nothing in /var/crash because it hasn't crashed, it's
hung. how might i invoke apport or xdiagnose or ubuntu-bug to capture
useful information from a hang? i went searching but didn't find an
answer. i did find bug #1575878 which looks likely to be a duplicate of
this issue.
so i checked again thst ctl-alt-F2 and ctl-alt-F3 still didn't work,
sent Xorg signals 15, 2, 1, and 3, it finally disappeared, ctl-alt-F2
and ctl-alt-F3 work now, and i find
/var/crash/_usr_lib_xorg_Xorg.444.crash, attached.
does that contain anything useful?
do please let me know if there's a way to gether more useful information
the next time this bug bites.
** Attachment added: "/var/crash/_usr_lib_xorg_Xorg.444.crash"
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1757299/+attachment/5131194/+files/_usr_lib_xorg_Xorg.444.crash
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https://bugs.launchpad.net/bugs/1757299
Title:
[Dell OptiPlex 755] Intermittently GUI hangs with high xorg CPU% after
launching applications
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