Macros 'lookup2_stage0_with_odd_support' can call rte_ctz with zero value
(pkt_mask), which is undefined behaviour based on the GCC manual:
 https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html

Quote: "
Built-in Function: int __builtin_ctz (unsigned int x)
Returns the number of trailing 0-bits in x, starting at the least significant
bit position. If x is 0, the result is undefined.
"

It is confirmed by checking this code in GCC-13 with ASAN.