Kernel panic caused when flashing images to an imx6 board

I'm using an imx6sll board with yocto bsp, and mfg tool to flash images.

The kernel and u-boot seem to flash without any issue but on flashing rootfs I get an error saying:

Writing inode tables: Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b

---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b

The ucl script which is used for flashing had run upto this command

UTP: received command '$ mkfs.ext3 -F -E nodiscard /dev/mmcblk1p2'

I can't seem to figure out what caused the panic. I ran ddr callibration test and it passed. Does anyone have any idea why this may be?