login: panic: _mtx_lock_sleep: recursed on non-recursive mutex process lock @ /syzkaller/managers/main/kernel/sys/kern/kern_fork.c:325

cpuid = 0
time = 1660142936
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0xc7/frame 0xfffffe0092c4c5d0
kdb_backtrace() at kdb_backtrace+0xd3/frame 0xfffffe0092c4c730
vpanic() at vpanic+0x254/frame 0xfffffe0092c4c810
panic() at panic+0xb5/frame 0xfffffe0092c4c8d0
__mtx_lock_sleep() at __mtx_lock_sleep+0xa10/frame 0xfffffe0092c4ca10
__mtx_lock_flags() at __mtx_lock_flags+0x231/frame 0xfffffe0092c4caf0
fork1() at fork1+0x6de/frame 0xfffffe0092c4cc10
sys_rfork() at sys_rfork+0x1c2/frame 0xfffffe0092c4cd30
amd64_syscall() at amd64_syscall+0x410/frame 0xfffffe0092c4cf30
fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe0092c4cf30
--- syscall (0, FreeBSD ELF64, nosys), rip = 0x2b43fa, rsp = 0x828841f68, rbp = 0x828841f70 ---
KDB: enter: panic
[ thread pid 3914 tid 103252 ]
Stopped at      kdb_enter+0x6b: movq    $0,0x276046a(%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         0xfffffe00033eee30
rdx         0xdffff7c000000000
rbx                          0
rsp         0xfffffe0092c4c710
rbp         0xfffffe0092c4c730
rsi                        0x1
rdi                          0
r8                         0x3
r9                  0xffffffff
r10                          0
r11                          0
r12                          0
r13         0xfffffe0058da9720
r14         0xffffffff82b67860  .str.26
r15         0xffffffff82b67860  .str.26
rip         0xffffffff8171ddab  kdb_enter+0x6b
rflags                    0x46
kdb_enter+0x6b: movq    $0,0x276046a(%rip)
db> show proc
Process 3914 (syz-executor1172346) at 0xfffffe008fe61000:
 state: NORMAL
 uid: 0  gids: 0, 0, 5
 parent: pid 779 at 0xfffffe0056f67a90
 ABI: FreeBSD ELF64
 flag: 0x10000080  flag2: 0
 arguments: ./syz-executor1172346391
 reaper: 0xfffffe0053ddd000 reapsubtree: 1
 sigparent: 20
 vmspace: 0xfffffe009242da00
   (map 0xfffffe009242da00)
   (map.pmap 0xfffffe009242dac0)
   (pmap 0xfffffe009242db30)
 threads: 3
100101                   Run     CPU 1                       syz-executor1172346
103251                   S       uwait   0xfffffe0057447800  syz-executor1172346
103252                   Run     CPU 0                       syz-executor1172346
db>