DragonFlyBSD

panic: assertion: (m->flags & PG_MAPPED) == 0 in vm_page_free_toq
cpuid = 0
Trace beginning at frame 0x5a353a3c
panic(ffffffff,0,82aca08,5a353a70,59e225e0) at 0x80ece4d
panic(82aca08,82f40e2,82f4611,5c17f0bc,b8aa3b29) at 0x80ece4d
vm_page_free_toq(506f4b28,5a28306c,5a353aa4,506f4b28,506f4b28) at 0x8281544
vm_object_deallocate(506f4b28,0,0,0,0) at 0x827ea1d
vm_page_rb_tree_RB_SCAN(5a411aa0,827f1e0,827e9b4,0,59e225e0) at 0x827f2e6
vm_object_terminate(5a411a8c,5a353b0c,80f9b91,83cf7c0,59e226f4) at 0x827d45c
vm_object_deallocate_locked(5a411a8c,5a353b88,8279076,5a411a8c,843db0c) at 0x827e7e2
vm_object_deallocate(5a411a8c,843db0c,28238000,5a353b68,82a7a9c) at 0x827e855
vm_map_delete(5721e1b8,0,bfc00000,5a353ba0,12) at 0x8279076
vm_map_remove(5721e1b8,0,bfc00000,59b99f60,59aea648) at 0x8279109
vm_map_remove(5721e1b8,59b99f60,5a353bf0,5721e2bc,59e225e0) at 0x827918d
_sysref_put(5721e2bc,0,82a54d6,50458248,59b99f60) at 0x80c3872
exit1(0,5a353cc0,82a2365,5a353c7c,5a353c8c) at 0x80d997b
sys_exit(5a353c7c,5a353c8c,4,571a5305,5721e1b8) at 0x80d9d30
syscall2(5a353d40,40400bf4,5a353cf0,0,0) at 0x82a2365
user_trap(5a353d40,1,5a353d40,59e2280c,28338360) at 0x82a25d9
go_user(5a353d38,0,0,7b,0) at 0x82a2ad7

Panic with most recent vm_object token fixes on a vkernel (so no kernel
core/dump). Running vm stress program: http://leaf.dragonflybsd.org/~vsrinivas/vm.c