panic: MNT_DEFERRED requires MNT_RECURSE | MNT_FORCE
cpuid = 1
time = 6
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0xc6/frame 0xfffffe0057065610
kdb_backtrace() at kdb_backtrace+0xd0/frame 0xfffffe0057065770
vpanic() at vpanic+0x257/frame 0xfffffe0057065930
panic() at panic+0xb5/frame 0xfffffe00570659f0
dounmount() at dounmount+0x1783/frame 0xfffffe0057065b30
kern_unmount() at kern_unmount+0x648/frame 0xfffffe0057065d10
amd64_syscall() at amd64_syscall+0x4e2/frame 0xfffffe0057065f30
fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe0057065f30
--- syscall (198, FreeBSD ELF64, __syscall), rip = 0x3a817a, rsp = 0x825c17f08, rbp = 0x825c17f80 ---
KDB: enter: panic
[ thread pid 1056 tid 100445 ]
Stopped at      kdb_enter+0x6e: movq    $0,0x2587a77(%rip)
db> 
db> set $lines = 0
db> set $maxwidth = 0
db> show registers
cs                        0x20
ds                        0x3b
es                        0x3b
fs                        0x13
gs                        0x1b
ss                        0x28
rax                       0x12
rcx         0xfffffe006ec00000
rdx                    0x7ffff
rbx         0xffffffff8283c160  .str.27
rsp         0xfffffe0057065750
rbp         0xfffffe0057065770
rsi                    0x80001
rdi         0xffffffff81664139  printf+0x149
r8                           0
r9                  0xffffffff
r10                          0
r11                       0x7f
r12         0xfffffe0058b2a780
r13         0xfffffffffffffffd
r14         0xffffffff8283c160  .str.27
r15                          0
rip         0xffffffff8164d41e  kdb_enter+0x6e
rflags                    0x46
k