Hi, please review the news item below:
- I am not 100% happy with the title but the 50 char limit doesn't allow any more details. - No Display-If condition because it is neither a genkernel nor kexec-tools issue. We maybe even have additional packages which are appending to kernel command-line I am not aware of. - In theory this shouldn't be a news for anyone: If you don't use a persistent device name, you are basically asking for troubles like that. However, people just using kexec from kexec-tools package maybe unaware that auto-detection of ROOT device which is the default might cause trouble like that because it won't use persistent names. - Experiencing a boot failure is always bad -- especially for headless/remote systems so a warning shouldn't hurt. - Latest kexec-tools ebuild in repository now also warns user in pkg_postinst, see https://gitweb.gentoo.org/repo/gentoo.git/tree/sys-apps/kexec-tools/kexec-tools-2.0.20-r3.ebuild?id=61c03ffab76740c0420e3c8a3185d047d461f7a7#n111 --- Title: Multiple root kernel command-line arguments Author: Thomas Deutschmann <whi...@gentoo.org> Posted: 2020-08-05 Revision: 1 News-Item-Format: 2.0 Due to genkernel-4.1 development which is changing device manager from MDEV to (E)UDEV it was noticed that some tools like kexec append an additional root argument to kernel command-line. If these tools will set root to a non-persistent device name like root=/dev/dm-3, the next boot might fail if there is *no* root device named like that in start environment (i.e. initramfs). While kexec's runscript was changed in >=sys-apps/kexec-tools-2.0.20-r2 to no longer append root kernel command-line argument when an option like "--reuse-cmdline" (default) is used, a cold reboot *without* kexec maybe needed to restore kernel command-line. NOTE: This issue is *not* specific to kexec or genkernel usage. Kernel will always use last set root kernel command-line argument. Any tool which might be appending root argument without a persistent device name might cause a boot failure if system cannot find that referenced root device during boot. To avoid boot problems user should revise their current kernel command-line (/proc/cmdline) to ensure that only *one* root kernel command-line argument is set. The usage of persistent device names like root=UUID=<...> is highly recommended. -- Regards, Thomas Deutschmann / Gentoo Linux Developer C4DD 695F A713 8F24 2AA1 5638 5849 7EE5 1D5D 74A5
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