Description of problem:

Running "grub2-mkconfig" will remove all options from the BLS entries in /boot/loader/entries and /etc/kernel/cmdline.

Version-Release number of selected component (if applicable):
grub2-tools-2.06-60.el9.x86_64

How reproducible:
Always

Steps to Reproduce:

1. cat /boot/loader/entries/* | grep ^options
   options root=UUID=b862bc8d-e44f-44be-95f8-93ccdcaa6b35 console=tty0 console=ttyS0,115200n8 no_timer_check net.ifnames=0 crashkernel=1G-4G:192M,4G-64G:256M,64G-:512M $tuned_params

1. cat /etc/kernel/cmdline
   root=UUID=b862bc8d-e44f-44be-95f8-93ccdcaa6b35 console=tty0 console=ttyS0,115200n8 no_timer_check net.ifnames=0<no newline at end>

1. cat /proc/cmdline
   BOOT_IMAGE=(hd0,gpt3)/vmlinuz-5.14.0-268.el9.x86_64 root=UUID=b862bc8d-e44f-44be-95f8-93ccdcaa6b35 console=tty0 console=ttyS0,115200n8 no_timer_check net.ifnames=0 crashkernel=1G-4G:192M,4G-64G:256M,64G-:512M

1. grub2-mkconfig -o /dev/null
   Generating grub configuration file ...
   Adding boot menu entry for UEFI Firmware Settings ...
   done

1. cat /boot/loader/entries/* | grep ^options
   options root=UUID=b862bc8d-e44f-44be-95f8-93ccdcaa6b35 ro

1. cat /etc/kernel/cmdline
   root=UUID=b862bc8d-e44f-44be-95f8-93ccdcaa6b35 ro

Actual results:

As above.

Expected results:

Running grub2-mkconfig should not change the BLS entries or /etc/kernel/cmdline.

(My expectation is that grub2-mkconfig should never change any files itself, it should only gather information and output a config file that I then might or might not install for real. But maybe that is a wrong expectation.)

Additional info:

I think this has started to happen for two reasons:

• GRUB_CMDLINE_LINUX in /etc/default/grub is empty in RHEL 9, probably since the beginning. In RHEL 8 and Fedora, it matches the BLS entries.

• The 10_linux part of grub2-mkconfig used to only look at BLS entries that match the machine id and would miss the one that is actually present, which looks like this:

1. ls /boot/loader/entries
   ffffffffffffffffffffffffffffffff-5.14.0-268.el9.x86_64.conf

This is why grub2-mkconfig would not clobber BLS entries before RHEL 9.2, I think. It would probably clobber /etc/kernel/cmdline.

Now 10_linux processes all files in /boot/loader/entries.

Also note that /etc/kernel/cmdline does not contain the crashkernel option that is in the BLS entries.