icmp response flapping during CPU load

[AlexanderYT]

ICMP response flapping detected when CPU is high utilization in a quest system.

It is log ICMP response. 54916 - PID of guest OS.
# while true ; do pidstat -p 54916 1 1 | grep -v -e Linux -e Average; ping -c1 10.11.110.213 | grep ttl=64; done

05:06:19 PM UID PID %usr %system %guest %CPU CPU Command
05:06:20 PM 109 54916 0.00 18.00 25.00 30.00 5 qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.939 ms

05:06:20 PM UID PID %usr %system %guest %CPU CPU Command
05:06:21 PM 109 54916 0.00 72.00 31.00 72.00 5 qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.166 ms

05:06:21 PM UID PID %usr %system %guest %CPU CPU Command
05:06:22 PM 109 54916 47.00 55.00 6.00 108.00 0 qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.086 ms

05:06:22 PM UID PID %usr %system %guest %CPU CPU Command
05:06:23 PM 109 54916 0.00 149.00 3.00 149.00 0 qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=3406 ms

05:06:27 PM UID PID %usr %system %guest %CPU CPU Command
05:06:28 PM 109 54916 50.00 0.00 86.00 136.00 0 qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.312 ms

05:06:28 PM UID PID %usr %system %guest %CPU CPU Command
05:06:29 PM 109 54916 0.00 0.00 43.00 22.00 0 qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.338 ms

05:06:29 PM UID PID %usr %system %guest %CPU CPU Command
05:06:30 PM 109 54916 0.00 0.00 32.00 16.00 0 qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.134 ms

05:06:30 PM UID PID %usr %system %guest %CPU CPU Command
05:06:31 PM 109 54916 0.00 26.00 43.00 47.00 0 qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.296 ms

05:06:31 PM UID PID %usr %system %guest %CPU CPU Command
05:06:32 PM 109 54916 61.00 0.00 70.00 131.00 5 qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.139 ms

05:06:32 PM UID PID %usr %system %guest %CPU CPU Command
05:06:33 PM 109 54916 0.00 102.00 28.00 102.00 5 qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.153 ms

05:06:33 PM UID PID %usr %system %guest %CPU CPU Command
05:06:34 PM 109 54916 24.00 49.00 0.00 73.00 6 qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=3205 ms

05:06:37 PM UID PID %usr %system %guest %CPU CPU Command
05:06:38 PM 109 54916 0.00 0.00 148.00 123.00 7 qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.097 ms

05:06:38 PM UID PID %usr %system %guest %CPU CPU Command
05:06:39 PM 109 54916 0.00 23.00 55.00 52.00 0 qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.323 ms

05:06:39 PM UID PID %usr %system %guest %CPU CPU Command
05:06:40 PM 109 54916 50.00 52.00 3.00 105.00 0 qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=4260 ms

05:06:44 PM UID PID %usr %system %guest %CPU CPU Command
05:06:45 PM 109 54916 0.00 54.00 85.00 96.00 12 qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.306 ms

05:06:45 PM UID PID %usr %system %guest %CPU CPU Command
05:06:46 PM 109 54916 0.00 38.00 71.00 74.00 7 qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.143 ms

05:06:46 PM UID PID %usr %system %guest %CPU CPU Command
05:06:47 PM 109 54916 60.00 0.00 78.00 138.00 11 qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.188 ms

05:06:47 PM UID PID %usr %system %guest %CPU CPU Command
05:06:48 PM 109 54916 0.00 0.00 78.00 42.00 11 qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.140 ms

05:06:48 PM UID PID %usr %system %guest %CPU CPU Command
05:06:49 PM 109 54916 0.00 14.00 44.00 37.00 11 qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.234 ms

05:06:49 PM UID PID %usr %system %guest %CPU CPU Command
05:06:50 PM 109 54916 0.00 4.00 4.00 5.00 11 qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.185 ms

05:06:50 PM UID PID %usr %system %guest %CPU CPU Command
05:06:51 PM 109 54916 0.00 1.00 1.00 2.00 11 qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.274 ms
^C64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.144 ms

05:06:52 PM UID PID %usr %system %guest %CPU CPU Command
05:06:53 PM 109 54916 81.00 0.00 38.00 119.00 7 qemu-system-x86
64 bytes from 10.11.110.213: icmp_seq=1 ttl=64 time=0.102 ms

[Serge Hallyn (serge-hallyn)]

Thanks for reporting this bug.

To give us some more information about your host, could you please do

apport-collect 1347684

Please show the results of

dpkg -l | grep qemu
uname -a
cat /etc/*-release

[AlexanderYT (arcam)]

I have trouble with run apport-collect from shell

# dpkg -l | grep qemu
ii ipxe-qemu 1.0.0+git-20131111.c3d1e78-2ubuntu1 all PXE boot firmware - ROM images for qemu
ii qemu-common 2.0.0+dfsg-2ubuntu1.1 all dummy transitional package from qemu-common to qemu-keymaps
ii qemu-keymaps 2.0.0+dfsg-2ubuntu1.1 all QEMU keyboard maps
ii qemu-kvm 2.0.0+dfsg-2ubuntu1.1 amd64 QEMU Full virtualization on x86 hardware (transitional package)
ii qemu-system-common 2.0.0+dfsg-2ubuntu1.1 amd64 QEMU full system emulation binaries (common files)
ii qemu-system-x86 2.0.0+dfsg-2ubuntu1.1 amd64 QEMU full system emulation binaries (x86)
ii qemu-utils 2.0.0+dfsg-2ubuntu1.1 amd64 QEMU utilities

# uname -a
Linux g8-4 3.13.0-31-generic #55-Ubuntu SMP Tue Jul 1 15:51:53 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

# cat /etc/*-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION="Ubuntu 14.04 LTS"
NAME="Ubuntu"
VERSION="14.04, Trusty Tahr"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 14.04 LTS"
VERSION_ID="14.04"
HOME_URL="http://www.ubuntu.com/"
SUPPORT_URL="http://help.ubuntu.com/"
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"

[Serge Hallyn (serge-hallyn)]

This sort of result is not unexpected when the guest is under high load, depending on your setup and whether the nics are emulated.

Can you show your kvm command line?

[Launchpad Janitor (janitor)]

[Expired for qemu-kvm (Ubuntu) because there has been no activity for 60 days.]