This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:
apport-collect 1811226 and then change the status of the bug to 'Confirmed'. If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'. This change has been made by an automated script, maintained by the Ubuntu Kernel Team. ** Changed in: linux (Ubuntu) Status: New => Incomplete -- 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/1811226 Title: ipvsadm --ops causes CPU soft lockup on traffic Status in linux package in Ubuntu: Incomplete 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1811226/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp