kexec fails to load a kernel if we add rhgb, quiet parameters to the kernel stanza

Issue

• Current grub configuration and check that quiet and rhgb are present :

#cat /proc/cmdline 
ro root=/dev/mapper/myvg-rootvol rd_NO_LUKS  KEYBOARDTYPE=pc KEYTABLE=fr LANG=en_US.UTF-8 rd_NO_MD quiet SYSFONT=latarcyrheb-sun16 rhgb  rd_LVM_LV=myvg/rootvol rd_NO_DM

• Try this :

#kexec -l /boot/vmlinuz-`uname -r` --initrd=/boot/initramfs-`uname -r`.img --command-line=\"`cat /proc/cmdline`\"

It will crash.

• Try this :

#kexec -l /boot/vmlinuz-`uname -r` --initrd=/boot/initramfs-`uname -r`.img --command-line="`sed 's/ rhgb\| quiet//g' /proc/cmdline`"

It works !