@TJ I share your disbelief that led me to checking this 3 times.
I came to this conclusion by 3 times git bisecting mainline kernel between different tags. Took me good 2 weeks to come to this conclusion but I could be wrong. To confirm this I tested this fix with mainline kernel with 24.04 and 22.04 ( 6.8 HWE Next ). Compiled mainline 6.8 Added a test param to command line with grub testparam=f081c381e7b54edcba27e5f790d47911a4cc3e726d8d256878d3df9175c020e0f081c381e7b54edcba27e5f790d47911a4cc3e726d8d256878d3df9175c020e0f081c381e7b5 Kernel fails to boot. Recomplied mainline 6.8 with reverting dc3f5aae0638 Kernel boots fine. -- WTH --- Agreed. -- 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/2069534 Title: linux 6.8 fails to boot on arm64 if any param is more than 140 chars Status in linux package in Ubuntu: Fix Released Status in linux source package in Noble: Confirmed Bug description: Hi, Linux 6.8 kernel fails to boot on ARM64 when any Linux command line param is more than 140 characters. Test Machine ============= Rockchip RK3399 based RockPro64 with latest u-boot 2024.07-rc3 in EFI mode booting grubaa64.efi Reproduced on ============== Ubuntu 22.04.4 with Linux HWE Proposed 6.8 Ubuntu 24.04 with Linux 6.8 Works on ========= Ubuntu 22.04.4 with Linux 5.15, 6.6, 6.7, 6.9 Steps to reproduce ==================== 1. Install Ubuntu 24.04 which comes with Linux 6.8 by default or Ubuntu 22.04.4 install Linux HWE 6.8 from https://launchpad.net/~canonical-kernel- team/+archive/ubuntu/proposed?field.series_filter=jammy 2. Edit /boot/grub/grub.cfg and add the following param to any boot entry with Linux 6.8 testparam=f081c381e7b54edcba27e5f790d47911a4cc3e726d8d256878d3df9175c020e0f081c381e7b54edcba27e5f790d47911a4cc3e726d8d256878d3df9175c020e0f081c381e7b5 3. Reboot the machine and select the boot entry in grub with the testparam as above. 4. Observe kernel never boots. Cause ======== After bisecting the kernel, I found that the bug was introduced in Linux 6.8-rc1 ( and released in Linux 6.8 ) with commit commit dc3f5aae06381b43bc9d0d416bd15ee1682940e9 Author: Ard Biesheuvel <a...@kernel.org> Date: Wed Nov 29 12:16:12 2023 +0100 arm64: idreg-override: Avoid parameq() and parameqn() This got fixed with Linux 6.9-rc1 and released in Linux 6.9 as part of rework commit e223a449125571daa62debd8249fa4fc2da0a961 Author: Ard Biesheuvel <a...@kernel.org> Date: Wed Feb 14 13:28:50 2024 +0100 arm64: idreg-override: Move to early mini C runtime That got merged to Linux 6.9-rc1 with commit commit 6d75c6f40a03c97e1ecd683ae54e249abb9d922b Merge: fe46a7dd189e 1ef21fcd6a50 Author: Linus Torvalds <torva...@linux-foundation.org> Date: Thu Mar 14 15:35:42 2024 -0700 Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux Fix Options ============= Option 1. For Linux 6.8 the safest fix would be to revert commit dc3f5aae06381b43bc9d0d416bd15ee1682940e9 Author: Ard Biesheuvel <a...@kernel.org> Date: Wed Nov 29 12:16:12 2023 +0100 arm64: idreg-override: Avoid parameq() and parameqn() Option 2. Unless Ubuntu Team is interested in bringing the whole Mini C Runtime rework to Linux 6.8 with commit 6d75c6f40a03c97e1ecd683ae54e249abb9d922b Merge: fe46a7dd189e 1ef21fcd6a50 Author: Linus Torvalds <torva...@linux-foundation.org> Date: Thu Mar 14 15:35:42 2024 -0700 Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux Please revert the change in Linux 6.8 Thanks To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2069534/+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
