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 1824864 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 ** Changed in: linux (Ubuntu Bionic) Status: New => Incomplete ** Changed in: linux (Ubuntu Cosmic) Status: New => Incomplete ** Changed in: linux (Ubuntu Xenial) 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/1824864 Title: CONFIG_LOG_BUF_SHIFT set to 14 is too low on arm64 Status in linux package in Ubuntu: Incomplete Status in linux source package in Xenial: Incomplete Status in linux source package in Bionic: Incomplete Status in linux source package in Cosmic: Incomplete Status in linux source package in Disco: Incomplete Status in linux source package in EE-Series: New Bug description: CONFIG_LOG_BUF_SHIFT policy<{ 'amd64' : '18', 'arm64' : '14', 'armhf' : '17', 'i386' : '17', 'ppc64el': '17', 's390x' : '17'}> Please set CONFIG_LOG_BUF_SHIFT to at least 17 on arm64. Potentially bump all 64-bit arches to 18 (or higher!) as was done on amd64, meaning set 18 on arm64 s390x ppc64el. I have a systemd autopkgtest test that asserts that we see Linux kernel command line in the dmesg (journalctl -k -b). And it is consistently failing on arm64 scalingstack KVM EFI machines with messages of "missing 81 kernel messages". config LOG_BUF_SHIFT int "Kernel log buffer size (16 => 64KB, 17 => 128KB)" range 12 25 default 17 depends on PRINTK help Select the minimal kernel log buffer size as a power of 2. The final size is affected by LOG_CPU_MAX_BUF_SHIFT config parameter, see below. Any higher size also might be forced by "log_buf_len" boot parameter. Examples: 17 => 128 KB 16 => 64 KB 15 => 32 KB 14 => 16 KB 13 => 8 KB 12 => 4 KB 14 sounds like redictiously low for arm64. given that 17 is default across 32-bit arches, and 18 is default on amd64. Please backport this to xenial and up. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1824864/+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