Problem while running stack in Linux kernel space

Hello All, I have got my own IPv6 stack (not the Linux native IPv6). Legend: NUT - Node Under Test - Where my stack runs TN - Testing Node - Where Linux native IPv6 stack runs When i insert IPv6 stack (compiled as a module) in to the NUT kernel, it gets inserted in very smoothly. However, when i do ping6 from TN with -f (FLOOD) option to NUT, the NUT's kernel seems to be hanging. But, i observed that IPv4 part of the NUT's kernel still working (because ping from TN to NUT still works). I am controlling NUT's kernel with KGDB (through serial cable). If i see 'bt' in gdb, it shows that it is waiting in sys_read. PS : I skipped the KGDB back trace in the above description for clarity.