BUILD_EXIT=0
-rwxr-xr-x  1 maxx  maxx  9936 Jul 18 18:07 df0513
DF-0513: racing ip6_fw_chk against chain mutation for 20s (needs ip6fw module loaded)
[sender] sent 0 pkts, errors 28325
[mutator] add=21446 del=21446 err=0 (iters 21446)
DF-0513: done.  If the kernel panicked during the race window (check serial console / dmesg), the lock-free chain walk + kfree-after-crit_exit UAF is reproduced.