--- vmstat -m (pfrktable) before ---
[1] DIOCRADDTABLES([leakdup1,leakdup1]) rc=0 errno=0 nadd=1
[2] DIOCRADDTABLES(dummy,[leakdup2,leakdup2]) rc=0 errno=0 nadd=1
[3] DIOCRGETTABLES rc=-1 errno=25 (ENOTTY -- corruption detected, table listing broken) size=16
--- vmstat -m (pfrktable) after (leaked ktable + heads stay) ---
          pfrktable       3   4.12K       0    390M        4
--- pfctl sees the breakage too ---
pfctl: Inappropriate ioctl for device.
--- dmesg ---
HAMMER2: VOLDATA DUMP
HAMMER2: INITIATE SPANs
swap low/high-water marks set to 41940/62910
pfr_get_tables: corruption detected (2).
pfr_get_tables: corruption detected (2).