panic: MNT_DEFERRED requires MNT_RECURSE | MNT_FORCE
cpuid = 0
time = 1769334054
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0xc6/frame 0xfffffe0057352610
kdb_backtrace() at kdb_backtrace+0xd0/frame 0xfffffe0057352770
vpanic() at vpanic+0x257/frame 0xfffffe0057352930
panic() at panic+0xb5/frame 0xfffffe00573529f0
dounmount() at dounmount+0x1783/frame 0xfffffe0057352b30
kern_unmount() at kern_unmount+0x648/frame 0xfffffe0057352d10
amd64_syscall() at amd64_syscall+0x4e2/frame 0xfffffe0057352f30
fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe0057352f30
--- syscall (198, FreeBSD ELF64, __syscall), rip = 0x3a817a, rsp = 0x82580af08, rbp = 0x82580af80 ---
KDB: enter: panic
[ thread pid 1382 tid 100882 ]
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         0xfffffe0078a00000
rdx                    0x7ffff
rbx         0xffffffff8283c160  .str.27
rsp         0xfffffe0057352750
rbp         0xfffffe0057352770
rsi                    0x80001
rdi         0xffffffff81664139  printf+0x149
r8                           0
r9                  0xffffffff
r10                          0
r11                       0x7f
r12         0xfffffe0058b85000
r13         0xfffffffffffffffe
r14         0xffffffff8283c160  .str.27
r15                          0
rip         0xffffffff8164d41e  kdb_enter+0x6e
rflags                    0x46
kdb_enter+0x6e: movq    $0,0x2587a77(%rip)
db> show proc
Process 1382 (syz-executor) at 0xfffffe0058b2b570:
 state: NORMAL
 uid: 0 gid: 0 supp gids: 0, 5
 parent: pid 1313 at 0xfffffe0058af2558
 ABI: FreeBSD ELF64
 flag: 0x10000080  flag2: 0
 arguments: ./syz-executor exec
 reaper: 0xfffffe0007809010 reapsubtree: 1
 sigparent: 20
 vmspace: 0xfffffe0058b58248
   (map 0xfffffe0058b58248)
   (map.pmap 0xfffffe0058b582e8)
   (pmap 0xfffffe0058b58358)
 threads: 2
100549                   RunQ                                syz-executor
100882                   Run     CPU 0                       syz-executor
db>