Today's "hang" involved a zombie compiz consuming 100% of a cpu, along
with an emacs instance consuming another 100%. Load average around 11,
and climbing. Only 22 zombies currently, but it was 4 when I managed to
get on with ssh.
I was in the process of installing software updates, using the GUI tool
(rather than direct use of apt-get from the shell) when this happened.
Parts of the update still seem to be running.
arlie@ansuz$ ps -Fa -p1 -www
UID PID PPID C SZ RSS PSR STIME TTY TIME CMD
root 1 0 0 30034 4656 2 Apr28 ? 00:00:08 /sbin/init
splash
root 25826 25775 0 1127 1712 0 07:57 pts/18 00:00:00 /bin/sh -e
/var/lib/dpkg/info/udev.postrm upgrade 229-4ubuntu17
root 25843 25826 0 6542 1352 0 07:57 pts/18 00:00:00 systemctl
--system daemon-reload
arlie 25846 22284 0 9342 3232 2 07:57 pts/4 00:00:00 ps -Fa -p1 -www
I'm wondering now whether my first guess of a kernel issue is dead wrong, and
the root cause is actually compiz. Or perhaps we have multiple causes, for the
same basic symptom.
Here's the current crop of defunct processes
arlie@ansuz$ ps aux | grep defunct
arlie 2488 0.0 0.0 0 0 ? Z<l Apr28 0:00 [pulseaudio]
<defunct>
arlie 2503 0.8 0.0 0 0 ? Zsl Apr28 55:08 [compiz]
<defunct>
arlie 2692 0.0 0.0 0 0 ? Z Apr28 0:00 [gconf-helper]
<defunct>
root 22212 0.0 0.0 0 0 ? Z 07:42 0:00
[check-new-relea] <defunct>
sshd 24480 0.0 0.0 0 0 ? Z 07:52 0:00 [sshd]
<defunct>
sshd 24489 0.0 0.0 0 0 ? Z 07:52 0:00 [sshd]
<defunct>
sshd 24491 0.0 0.0 0 0 ? Z 07:52 0:00 [sshd]
<defunct>
sshd 24494 0.0 0.0 0 0 ? Z 07:53 0:00 [sshd]
<defunct>
sshd 24496 0.0 0.0 0 0 ? Z 07:53 0:00 [sshd]
<defunct>
sshd 24500 0.0 0.0 0 0 ? Z 07:53 0:00 [sshd]
<defunct>
sshd 24504 0.0 0.0 0 0 ? Z 07:53 0:00 [sshd]
<defunct>
sshd 24508 0.0 0.0 0 0 ? Z 07:53 0:00 [sshd]
<defunct>
sshd 24510 0.0 0.0 0 0 ? Z 07:54 0:00 [sshd]
<defunct>
sshd 24514 0.0 0.0 0 0 ? Z 07:54 0:00 [sshd]
<defunct>
sshd 24518 0.0 0.0 0 0 ? Z 07:54 0:00 [sshd]
<defunct>
sshd 24523 0.0 0.0 0 0 ? Z 07:54 0:00 [sshd]
<defunct>
sshd 24532 0.0 0.0 0 0 ? Z 07:54 0:00 [sshd]
<defunct>
sshd 24538 0.0 0.0 0 0 ? Z 07:55 0:00 [sshd]
<defunct>
sshd 24541 0.0 0.0 0 0 ? Z 07:55 0:00 [sshd]
<defunct>
sshd 24543 0.0 0.0 0 0 ? Z 07:55 0:00 [sshd]
<defunct>
sshd 25708 0.0 0.0 0 0 ? Z 07:55 0:00 [sshd]
<defunct>
sshd 25711 0.0 0.0 0 0 ? Z 07:56 0:00 [sshd]
<defunct>
arlie 26946 0.0 0.0 14228 964 pts/4 S+ 08:00 0:00 grep defunct
Systemd is in top's state "D" - just like last time. That's an
uninterruptable sleep. It does not appear to have accumulated any cpu
time since I got in via ssh.
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2503 arlie 20 0 0 0 0 Z 100.0 0.0 61:12.34 compiz
7 root 20 0 0 0 0 S 0.3 0.0 0:57.09 rcu_sched
1 root 20 0 120136 4656 3204 D 0.0 0.1 0:08.94 systemd
2 root 20 0 0 0 0 S 0.0 0.0 0:00.02 kthreadd
So the root cause might be systemd blocking on something.
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1680502
Title:
Hang after upgrade to 16.04
Status in linux package in Ubuntu:
Incomplete
Status in linux source package in Xenial:
Incomplete
Bug description:
Last week I upgraded from 12.04 LTS to 14.04 LTS and then immediately
to 16.04 LTS.
12.04 was not entirely stable; something was crashing regularly, and
the Ubuntu tools make it hard for a user to determine what. The
upgrade went moderately well; I now get error messages during system
startup (about an unnamed file not being found) and a couple of other
bits of flakiness, but I counted it as a success and the system as
functional.
This morning I tried to wake up my screen, and nothing much happened.
I then attempted to ssh to the ubuntu box from another system. This
requested my password almost instantly, as normal - but then nothing
else happened, and the connection eventually dropped.
I conclude that IP and TCP are functional, and it's possible for some
processes to respond, but not many. So it's not a complete kernel
hang. (In particular, I'm seeing evidence that it's getting beyond
things done at interrupt level.)
I don't have any debugging aids installed, so I don't believe I can
get a kernel crash dump, which is what I'd want if I were debugging
this. I *can* potentially retrieve and attach logs, but you'll have to
tell me which ones are relevant, and do so before they rollover.
(Also, logging will have to be functioning; IIRC, there were syslog
issues in 12.04, and while I'd implemented whatever fix was
reccommended at the time, I haven't looked at my logs since the
upgrade.)
This is a desk top system originally from System 76 - i.e. built for
linux - that's also running a bunch of server software (postfix,
apache, ...) I was not (knowingly) running anythign unusual at the
time - probably Unity, a few shells, firefox, maybe guncash and/or
emacs - and all the usual demons.
IIRC, I was not at the very latest versions of all software installed
- some new versions ahd come out since I upgraded, and I was going to
deal with installing them on the weekend.
I'm going to hard reboot the system now. I can then gather identifying info.
If I have time this AM before work, I'll check for standard things you want in
all bugs, and add them. (Right now I'm posting from my Mac laptop ;-))
---
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: arlie 2507 F.... pulseaudio
/dev/snd/controlC0: arlie 2507 F.... pulseaudio
CurrentDesktop: Unity
DistroRelease: Ubuntu 16.04
HibernationDevice: RESUME=UUID=e206b01d-6cec-4b56-b469-25b106536f09
InstallationDate: Installed on 2012-04-26 (1811 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64
(20120425)
MachineType: System76, Inc. Wild Dog Performance
NonfreeKernelModules: nvidia
Package: linux (not installed)
ProcFB:
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-72-generic
root=UUID=96551326-e461-4071-ab9c-0e81ad7015d7 ro quiet splash
ProcVersionSignature: Ubuntu 4.4.0-72.93-generic 4.4.49
RelatedPackageVersions:
linux-restricted-modules-4.4.0-72-generic N/A
linux-backports-modules-4.4.0-72-generic N/A
linux-firmware 1.157.8
RfKill:
0: phy0: Wireless LAN
Soft blocked: yes
Hard blocked: no
Tags: xenial
Uname: Linux 4.4.0-72-generic x86_64
UpgradeStatus: Upgraded to xenial on 2017-03-31 (11 days ago)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 02/24/2012
dmi.bios.vendor: Intel Corp.
dmi.bios.version: KCH7710H.86A.0069.2012.0224.1825
dmi.board.name: DH77KC
dmi.board.vendor: Intel Corporation
dmi.board.version: AAG39641-400
dmi.chassis.type: 3
dmi.chassis.vendor: System76, Inc.
dmi.chassis.version: WilP9
dmi.modalias:
dmi:bvnIntelCorp.:bvrKCH7710H.86A.0069.2012.0224.1825:bd02/24/2012:svnSystem76,Inc.:pnWildDogPerformance:pvrwilp9:rvnIntelCorporation:rnDH77KC:rvrAAG39641-400:cvnSystem76,Inc.:ct3:cvrWilP9:
dmi.product.name: Wild Dog Performance
dmi.product.version: wilp9
dmi.sys.vendor: System76, Inc.
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