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Bug
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Resolution: Unresolved
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Undefined
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None
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rhel-10.0
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Yes
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None
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rhel-bootloader
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ssg_core_services
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3
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False
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False
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None
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Red Hat Enterprise Linux
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None
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None
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None
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x86_64
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None
What were you trying to do that didn't work?
Setting either the default kernel or the boot_next kernel using the index value shown by grubby might not boot the selected kernel.
It appears that in some cases grub can sort the kernels in a different order than grubby does. So the index selected by a root user based on grubby output could result in the booting of a different kernel.
Please provide the package NVR for which the bug is seen:
grubby-8.40-77.el10.x86_64
grub2-efi-x64-2.12-1.el10.x86_64
How reproducible is this bug?:
It's 100% reproducible with kernels that have a particular local version suffix, e.g.
root@dell-per640-02:~# rpm -qa kernel kernel-6.12.0-35.el10.x86_64 kernel-6.12.0-35.99_1592504161.el10.x86_64 root@dell-per640-02:~#
Steps to reproduce
root@dell-per640-02:~# grubby --info=ALL index=0 kernel="/boot/vmlinuz-6.12.0-35.el10.x86_64" args="ro crashkernel=1G-4G:192M,4G-64G:256M,64G-:512M resume=UUID=24f31251-2e86-448b-b735-42f22d3c89c6 rd.lvm.lv=rhel_dell-per640-02/root rd.lvm.lv=rhel_dell-per640-02/swap console=tty0 console=ttyS0,115200n81 $tuned_params" root="/dev/mapper/rhel_dell--per640--02-root" initrd="/boot/initramfs-6.12.0-35.el10.x86_64.img $tuned_initrd" title="Red Hat Enterprise Linux (6.12.0-35.el10.x86_64) 10.0 (Coughlan)" id="89d201451f76424ea97479f9ffbce602-6.12.0-35.el10.x86_64" index=1 kernel="/boot/vmlinuz-6.12.0-35.99_1592504161.el10.x86_64" args="ro crashkernel=1G-4G:192M,4G-64G:256M,64G-:512M resume=UUID=24f31251-2e86-448b-b735-42f22d3c89c6 rd.lvm.lv=rhel_dell-per640-02/root rd.lvm.lv=rhel_dell-per640-02/swap console=tty0 console=ttyS0,115200n81 $tuned_params" root="/dev/mapper/rhel_dell--per640--02-root" initrd="/boot/initramfs-6.12.0-35.99_1592504161.el10.x86_64.img $tuned_initrd" title="Red Hat Enterprise Linux (6.12.0-35.99_1592504161.el10.x86_64) 10.0 (Coughlan)" id="89d201451f76424ea97479f9ffbce602-6.12.0-35.99_1592504161.el10.x86_64" index=2 kernel="/boot/vmlinuz-0-rescue-89d201451f76424ea97479f9ffbce602" args="ro crashkernel=1G-4G:192M,4G-64G:256M,64G-:512M resume=UUID=24f31251-2e86-448b-b735-42f22d3c89c6 rd.lvm.lv=rhel_dell-per640-02/root rd.lvm.lv=rhel_dell-per640-02/swap console=ttyS0,115200n81" root="/dev/mapper/rhel_dell--per640--02-root" initrd="/boot/initramfs-0-rescue-89d201451f76424ea97479f9ffbce602.img" title="Red Hat Enterprise Linux (0-rescue-89d201451f76424ea97479f9ffbce602) 10.0 (Coughlan)" id="89d201451f76424ea97479f9ffbce602-0-rescue" root@dell-per640-02:~#
Set the default to the 6.12.0-25.el10 kernel using its index=0.
root@dell-per640-02:~# grub2-set-default 0 root@dell-per640-02:~# grub2-editenv list saved_entry=0 menu_auto_hide=1 boot_success=0 boot_indeterminate=0 root@dell-per640-02:~# grubby --info=DEFAULT index=0 kernel="/boot/vmlinuz-6.12.0-35.el10.x86_64" args="ro crashkernel=1G-4G:192M,4G-64G:256M,64G-:512M resume=UUID=24f31251-2e86-448b-b735-42f22d3c89c6 rd.lvm.lv=rhel_dell-per640-02/root rd.lvm.lv=rhel_dell-per640-02/swap console=tty0 console=ttyS0,115200n81 $tuned_params" root="/dev/mapper/rhel_dell--per640--02-root" initrd="/boot/initramfs-6.12.0-35.el10.x86_64.img $tuned_initrd" title="Red Hat Enterprise Linux (6.12.0-35.el10.x86_64) 10.0 (Coughlan)" id="89d201451f76424ea97479f9ffbce602-6.12.0-35.el10.x86_64" root@dell-per640-02:~#
But with index=0, grub boots the other kernel, 6.12.0-35.99_1592504161.el10.
GRUB version 2.12 /----------------------------------------------------------------------------\ |*Red Hat Enterprise Linux (6.12.0-35.99_1592504161.el10.x86_64) 10.0 (Cough>| | Red Hat Enterprise Linux (6.12.0-35.el10.x86_64) 10.0 (Coughlan) | | Red Hat Enterprise Linux (0-rescue-89d201451f76424ea97479f9ffbce602) 10.0 >| | UEFI Firmware Settings | | | | | | | | | | | | | | | | | \----------------------------------------------------------------------------/
The exact same problem affects boot_next when set via grub2-reboot using an index value.
Expected results
grubby and grub should index the kernels (i.e. boot loader entries) in the same order.
They do in this case in RHEL 9.
