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>