[Bug 1313393] [NEW] dnsmasq lockup at 100% cpu

[Dave Gilbert]

Public bug reported:

I hit a case where dnsmasq was running at 100% cpu and not responding to requests.
This is a freshly installed and updated trusty VM which has just been dist-upgraded to utopic.

At boot/login it seemed OK, but then I bought up firefox and it couldn't get to it's home page, top showed dnsmasq eating cpu.
strace'ing dnsmasq showed it doing:

select(8, [0 3 6 7], [], [6], NULL)     = 1 (in [0])
recvmsg(0, 0x7ffffba98110, 0)           = -1 ENOTSOCK (Socket operation on non-socket)
accept(0, 0, NULL)                      = -1 ENOTSOCK (Socket operation on non-socket)
select(8, [0 3 6 7], [], [6], NULL)     = 1 (in [0])

constantly.

fd 8 is a pipe (not sure where to - back to another thread?)

This is the dnsmasq kicked off by a default network manager setup; not
changed any networking settings.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: dnsmasq-base 2.70-1
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
CurrentDesktop: Unity
Date: Sun Apr 27 17:58:21 2014
InstallationDate: Installed on 2014-04-27 (0 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Daily amd64 (20140412)
SourcePackage: dnsmasq
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: dnsmasq (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug utopic

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Title:
  dnsmasq lockup at 100% cpu

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