Hello Dave,
While I was investigating ARM support for CONFIG_SPARSEMEM,
I noticed
read_module_unwind_table in unwind_arm.c would call free(tbl->idx) twice
if(!readmem(idx_start, KVADDR, tbl->idx, idx, size,
"module unwind index table", RETURN_ON_ERROR))
I think you can remove free(tbl->idx) which just before "return FALSE".
Takuo