witness: lock order reversal:
 1st 0xffff8000015ac1f8 sbufsnd (&so->so_snd.sb_lock)
 2nd 0xfffffa00656eaec8 inode (&ip->i_lock)
lock order [1] sbufsnd (&so->so_snd.sb_lock) -> [2] inode (&ip->i_lock)
lock order data 0xffffffff8352ec32 -> 0xffffffff834a7428 is missing
lock order [2] inode (&ip->i_lock) -> [3] sbufrcv (&so->so_rcv.sb_lock)
#0  rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234
#1  sblock+0xb6 sys/kern/uipc_socket2.c:536
#2  soreceive+0x27d sys/kern/uipc_socket.c:890
#3  fifo_read+0x117 sys/miscfs/fifofs/fifo_vnops.c:264
#4  VOP_READ+0x101 sys/kern/vfs_vops.c:227
#5  vn_rdwr+0x15b sys/kern/vfs_vnops.c:-1
#6  vndsetcred+0xa1 sys/dev/vnd.c:685
#7  vndioctl+0xdfc sys/dev/vnd.c:486
#8  VOP_IOCTL+0xac sys/kern/vfs_vops.c:264
#9  vn_ioctl+0xf8 sys/kern/vfs_vnops.c:537
#10 sys_ioctl+0x674 sys/kern/sys_generic.c:-1
#11 syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#11 syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791
#12 Xsyscall+0x128
lock order [3] sbufrcv (&so->so_rcv.sb_lock) -> [1] sbufsnd (&so->so_snd.sb_lock)
#0  rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234
#1  sblock+0xb6 sys/kern/uipc_socket2.c:536
#2  sosplice+0x32b sys/kern/uipc_socket.c:1352
#3  sys_setsockopt+0x2ce sys/kern/uipc_syscalls.c:1234
#4  syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#4  syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791
#5  Xsyscall+0x128
Stopped at      db_enter+0x25:  addq    $0x8,%rsp
ddb{0}> 
ddb{0}> set $lines = 0
ddb{0}> set $maxwidth = 0
ddb{0}> show panic
the kernel did not panic
ddb{0}> show kasan
No such command
ddb{0}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
witness_checkorder(fffffa00656eaec8,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1
rw_do_enter_write(fffffa00656eaeb0,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234
rrw_enter(fffffa00656eaeb0,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
VOP_LOCK(fffffa0060578448,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
vn_lock(fffffa0060578448,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:576
vfs_lookup(ffff80002e38c2b0) at vfs_lookup+0x12b sys/kern/vfs_lookup.c:431
namei(ffff80002e38c2b0) at namei+0x7c1 sys/kern/vfs_lookup.c:250
unp_connect(ffff8000015ac010,fffffa0064a45100,ffff80002a22da00) at unp_connect+0x29d sys/kern/uipc_usrreq.c:875
uipc_dgram_send(ffff8000015ac010,fffffa0064a45800,fffffa0064a45100,fffffa0064a46100) at uipc_dgram_send+0x163 sys/kern/uipc_usrreq.c:609
sosend(ffff8000015ac010,fffffa0064a45100,ffff80002e38c538,0,fffffa0064a46100,c) at sosend+0x804 sys/kern/uipc_socket.c:-1
sendit(ffff80002a22da00,3,ffff80002e38c6b8,c,ffff80002e38c770) at sendit+0x5a5 sys/kern/uipc_syscalls.c:785
sys_sendmsg(ffff80002a22da00,ffff80002e38c820,ffff80002e38c770) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:603
syscall(ffff80002e38c820) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff80002e38c820) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xe50fe045640, count: -15
ddb{0}> show registers
rdi                                0
rsi                                0
rbp               0xffff80002e38bf20
rbx                                0
rdx                                0
rcx               0xffff80002a22da00
rax               0xffffffff839b6ff0    cpu_info_full_primary+0x1ff0
r8                0xffff80002e38be00
r9                0x8080808080808080
r10               0xd54bc1fd9673a522
r11               0xe5a9bb3c48ffd8e8
r12               0xfffffa00040de980
r13               0xfffffa00048c74d8
r14                              0x3
r15               0xffffffff83538532    substchar+0x194d
rip               0xffffffff82ea4935    db_enter+0x25
cs                               0x8
rflags                         0x246
rsp               0xffff80002e38bf10
ss                              0x10
db_enter+0x25:  addq    $0x8,%rsp
ddb{0}> show proc
PROC (syz-executor) tid=423159 pid=84373 tcnt=2 stat=onproc
    flags process=0 proc=4000000<THREAD>
    runpri=32, usrpri=75, slppri=32, nice=20
    wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
    forw=0xffffffffffffffff, list=0xffff80002a22c010,0xffff80002a22c2b8
    process=0xffff800045fed378 user=0xffff80002e387000, vmspace=0xfffffa006ced19a0
    estcpu=25, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0
ddb{0}>