insmod: error inserting '../../../kernel/crypto/twofish_common.ko': -1 Invalid module format
 

I am getting errors related to insmod of few modules during the boot-up of my system. It was working fine in my previous image. The only difference between my current image and the previous one is the change in kernel config file. I enabled the CONFIG_DEBUG_RCU_HEAD.

dmesg shows the following
twofish_common: disagrees about version of symbol module_layout


Note: insmod is successful after the system completes the boot-up

likely your gcc compiling wasn't successfull. I would recheck the compiling, maybe there was some errors.

check maybe also lsinitramfs which looks into initrd.img

As I commented in another thread, I always reset everything before compiling so that I know that I have, in fact, recompiled everything. It sounds to me like one or more of the modules were not recompiled. The Linux module-insertion logic contains aggressive module-compatibility tests, for obvious reasons.