panic: vm_phys_free_pages: page 0x... has unexpected order 0

FreeBSD 12.0-CURRENT amd64 r332472
Does this panic ring a bell to anyone?
Has it already been fixed?
Thank you!

panic: vm_phys_free_pages: page 0xfffff80cbfb71958 has unexpected order 0
cpuid = 3
time = 1526822662
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe017547c340
vpanic() at vpanic+0x18d/frame 0xfffffe017547c3a0
doadump() at doadump/frame 0xfffffe017547c420
vm_phys_free_pages() at vm_phys_free_pages+0x253/frame 0xfffffe017547c450
vm_page_free_phys_pglist() at vm_page_free_phys_pglist+0x37/frame 0xfffffe017547c470
vm_object_terminate() at vm_object_terminate+0x405/frame 0xfffffe017547c4d0
vm_object_deallocate() at vm_object_deallocate+0x45c/frame 0xfffffe017547c530
vm_map_process_deferred() at vm_map_process_deferred+0x99/frame 0xfffffe017547c560
vm_map_remove() at vm_map_remove+0xc6/frame 0xfffffe017547c590
exec_new_vmspace() at exec_new_vmspace+0x185/frame 0xfffffe017547c5f0
exec_elf64_imgact() at exec_elf64_imgact+0x907/frame 0xfffffe017547c6e0
kern_execve() at kern_execve+0x82c/frame 0xfffffe017547ca40
sys_execve() at sys_execve+0x4c/frame 0xfffffe017547cac0
amd64_syscall() at amd64_syscall+0x79b/frame 0xfffffe017547cbf0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe017547cbf0

-- 
Andriy Gapon