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 1925026 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/1925026 Title: Timer of 100us causes 64-bit app spin on Pi4 Status in linux package in Ubuntu: Incomplete Bug description: This problem happens with 64-bit 20.04 LTS or 20.10 on a Raspberry Pi 4 w/4GB (I am using the official Ubuntu Pi versions). It does NOT happen with either version when running on a standard x86 machine or VM. Also, it does NOT happen when using the 64-bit Raspberry Pi OS (https://downloads.raspberrypi.org/raspios_arm64/images/). So this issue is specific to the official 64-bit Ubuntu on Raspberry Pi version. When a 100us timer is started (via setitimer) the app will spin at 100%. With values slightly higher (150, 200, 1000) this does not happen. I've included the source for a small timer test program that I found reproduces the issue that broke my larger formal app. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1925026/+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