Public bug reported:
This bug may be a duplicate of
https://bugs.launchpad.net/ubuntu/+source/dnsmasq/+bug/1688364 but I'm
not sure, hence this new entry.
It hits while I wanted systemd to resolve the lxc domain to my internal
lxc hosts.
Step to (maybe) reproduce:
- having lxc installed
- make some user space lxc container
- uncomment the line LXC_DOMAIN="lxc" in /etc/default/lxc-net
- restart lxc-net service
Now the dnsmasq on 10.0.3.1 should be a dns resolving lxc names.
- add a file /etc/systemd/resolved.conf.d/lxc.conf
[Resolve]
DNS=10.0.3.1
Domains=~.lxc
DNSSEC=false
- restart systemd-resolved service
Now systemd knows it should ask .lxc names to dnsmasq
- start an lxc container, let assume it's called my-container
- ping it using my-container.lxc it should work
After some times, systemd-resolved should use 100% CPU.
Commenting the /etc/systemd/resolved.conf.d/lxc.conf file and restarting
it makes systemd-resolved never eating resources again.
ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: systemd 232-21ubuntu5
Uname: Linux 4.10.16-041016-generic x86_64
ApportVersion: 2.20.4-0ubuntu4.5
Architecture: amd64
CurrentDesktop: GNOME
Date: Tue Oct 3 18:18:56 2017
InstallationDate: Installed on 2015-11-10 (692 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
MachineType: Intel Corporation Skylake Platform
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.16-041016-generic
root=UUID=6814e3c1-8cea-4ecc-964d-535fd18782e9 ro quiet splash
crashkernel=384M-:128M vt.handoff=7
SourcePackage: systemd
UpgradeStatus: Upgraded to zesty on 2017-02-25 (219 days ago)
dmi.bios.date: 11/06/2015
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 5.11
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: WhiteTip Mountain1 Fab2
dmi.board.vendor: Topstar
dmi.board.version: RVP7
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 9
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr5.11:bd11/06/2015:svnIntelCorporation:pnSkylakePlatform:pvr0.1:rvnTopstar:rnWhiteTipMountain1Fab2:rvrRVP7:cvnDefaultstring:ct9:cvrDefaultstring:
dmi.product.name: Skylake Platform
dmi.product.version: 0.1
dmi.sys.vendor: Intel Corporation
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug zesty
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https://bugs.launchpad.net/bugs/1721092
Title:
systemd-resolved and dns-masq make CPU 100% when using lxc name
resolution
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