Hello, This a witness report I got on boot with snapshot Jun 1st amd64
root on sd0a (9b49e3196b9bfae8.a) swap on sd0b dump on sd0b lock order reversal: 1st 0xffffff021cdac180 vmmaplk (&map->lock) @ /usr/src/sys/uvm/uvm_map.c:4433 2nd 0xffffff01dc5f71a8 inode (&ip->i_lock) @ /usr/src/sys/ufs/ufs/ufs_vnops.c:1559 lock order "&ip->i_lock"(rrwlock) -> "&map->lock"(rwlock) first seen at: #0 witness_checkorder+0x494 #1 _rw_enter_read+0x49 #2 uvmfault_lookup+0x7d #3 uvm_fault+0x65 #4 trap+0x509 #5 Xalltraps_untramp+0xec #6 copyout+0x48 #7 ffs_read+0x1e0 #8 VOP_READ+0x3c #9 vn_read+0xba #10 dofilereadv+0x21c #11 sys_read+0x75 #12 syscall+0x31d #13 Xsyscall_untramp+0xc0 lock order "&map->lock"(rwlock) -> "&ip->i_lock"(rrwlock) first seen at: #0 witness_checkorder+0x494 #1 _rw_enter+0x56 #2 _rrw_enter+0x32 #3 VOP_LOCK+0x30 #4 vn_lock+0x24 #5 uvn_io+0x1a5 #6 uvm_pager_put+0xf9 #7 uvn_flush+0x414 #8 uvm_map_clean+0x3c7 #9 syscall+0x31d #10 Xsyscall_untramp+0xc0 -- Christophe Prévotaux
