You got a situation whereby the current version of the kernel does not match the current version of the symbol table (symtab) in /stand/dlkm. DLKM is the dynamic loadable kernel module used in 11.x onwards. What you can do is "match" 'em and the error will go away. The steps are :- # cd /stand/build # /usr/lbin/sysadm/system_prep -s system # mk_kernel -s system # kmupdate /stand/build/vmunix_test # shutdown -ry 0