apport information
** Attachment added: "WifiSyslog.txt"
https://bugs.launchpad.net/bugs/1811226/+attachment/5228267/+files/WifiSyslog.txt
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1811226
Title:
ipvsadm --ops causes CPU soft lockup on traffic
Status in linux package in Ubuntu:
Confirmed
Bug description:
Using IPVS with One-Packet Scheduling on UDP causes CPU soft lockup on
traffic.
Steps to reproduce:
1. Install ipvsadm and netcat-openbsd
2. Execute `ipvsadm -a -u 127.0.0.1:1234 -s rr --ops && ipvsadm -A -u
127.0.0.1:1234 -r 127.0.0.1:1235 -m -w 1`
3. Execute `nc -l -k -u 1235` to actually have a listening service
4. In another terminal, generate traffic `while sleep 0.01; do date | nc -u
-w 0 127.0.0.1 1234; done`
In only takes several packets (around 100 in my tests) to cause the
soft lockup to appear. Even with lower packet rates (sleep 1 for
example), the bug occurs.
This problem is already fixed in the current 4.20 vanilla kernel but
is present in the 4.15 vanilla kernel (tested packages from the
kernel-ppa). So basically, this would be a backport.
Ubuntu release: Ubuntu 18.04.1 LTS
Kernel version: Ubuntu 4.15.0-43.46-generic 4.15.18
---
ProblemType: Bug
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Jan 10 11:37 seq
crw-rw---- 1 root audio 116, 33 Jan 10 11:37 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.9-0ubuntu7.5
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord':
'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq',
'/dev/snd/timer'] failed with exit code 1:
DistroRelease: Ubuntu 18.04
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
Lsusb:
Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd
Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: QEMU Standard PC (i440FX + PIIX, 1996)
Package: linux (not installed)
PciMultimedia:
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-43-generic
root=UUID=27723a0b-84b7-4d41-ac73-d96bb9bc770a ro
ProcVersionSignature: Ubuntu 4.15.0-43.46-generic 4.15.18
RelatedPackageVersions:
linux-restricted-modules-4.15.0-43-generic N/A
linux-backports-modules-4.15.0-43-generic N/A
linux-firmware 1.173.2
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
Tags: bionic
Uname: Linux 4.15.0-43-generic x86_64
UnreportableReason: This report is about a package that is not installed.
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:
_MarkForUpload: False
dmi.bios.date: 04/01/2014
dmi.bios.vendor: SeaBIOS
dmi.bios.version: rel-1.11.1-0-g0551a4be2c-prebuilt.qemu-project.org
dmi.chassis.type: 1
dmi.chassis.vendor: QEMU
dmi.chassis.version: pc-i440fx-2.12
dmi.modalias:
dmi:bvnSeaBIOS:bvrrel-1.11.1-0-g0551a4be2c-prebuilt.qemu-project.org:bd04/01/2014:svnQEMU:pnStandardPC(i440FX+PIIX,1996):pvrpc-i440fx-2.12:cvnQEMU:ct1:cvrpc-i440fx-2.12:
dmi.product.name: Standard PC (i440FX + PIIX, 1996)
dmi.product.version: pc-i440fx-2.12
dmi.sys.vendor: QEMU
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