Hmm - 73 zombies?! And systemd is in an uninterruptible sleep. It moreover has
not accumulated any time since I first ran top, so I'd say it's still in the
*same* uninterruptible sleep... for at least 14 minutes. Also, the number of
zombies has been increasing, as of right now, it's 187.
I don't have the ability to live debug this kernel, but I'm morally convinced
that if we could trace the resource systemd is waiting on,
---
top - 08:34:16 up 3 days, 11:44, 2 users, load average: 10.00, 9.99, 8.69
Tasks: 472 total, 5 running, 280 sleeping, 0 stopped, 187 zombie
%Cpu(s): 1.2 us, 0.4 sy, 0.1 ni, 98.1 id, 0.2 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem : 8140712 total, 1037684 free, 336272 used, 6766756 buff/cache
KiB Swap: 7781712 total, 7495516 free, 286196 used. 7137692 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2527 arlie 20 0 0 0 0 Z 106.7 0.0 60:36.87 compiz
1 root 20 0 120072 3980 2132 D 0.0 0.0 0:06.37 systemd
2 root 20 0 0 0 0 S 0.0 0.0 0:00.02 kthreadd
---
And look at this, we have a defunct pager!!
arlie@ansuz$ ps -Fa -p1
UID PID PPID C SZ RSS PSR STIME TTY TIME CMD
root 1 0 0 30018 3980 3 Apr15 ? 00:00:06 /sbin/init
splash
arlie 24386 1 0 0 0 3 08:15 pts/2 00:00:00 [pager]
<defunct>
arlie 24859 24139 0 9342 3284 3 08:37 pts/2 00:00:00 ps -Fa -p1
--
I can't get the WCHAN for systemd out of ps. Sorry.
--
arlie@ansuz$ ps -e -o pid,wchan=WIDE-WCHAN-COLUMN -o comm | head
PID WIDE-WCHAN-COLUMN COMMAND
1 - systemd
2 - kthreadd
3 - ksoftirqd/0
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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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