witness: lock order reversal:
 1st 0xffff8000015b9130 sbufsnd (&so->so_snd.sb_lock)
 2nd 0xfffff3806d16d1e8 inode (&ip->i_lock)
lock order [1] sbufsnd (&so->so_snd.sb_lock) -> [2] inode (&ip->i_lock)
lock order data 0xffffffff8351f5d2 -> 0xffffffff83494977 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+0x2ba sys/kern/uipc_syscalls.c:1226
#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{1}> 
ddb{1}> set $lines = 0
ddb{1}> set $maxwidth = 0
ddb{1}> show panic
the kernel did not panic
ddb{1}> show kasan
No such command
ddb{1}> trace
db_enter() at db_enter+0x25 sys/arch/amd64/amd64/db_interface.c:438
witness_checkorder(fffff3806d16d1e8,9,0) at witness_checkorder+0x10d1 sys/kern/subr_witness.c:-1
rw_do_enter_write(fffff3806d16d1d0,1) at rw_do_enter_write+0xba sys/kern/kern_rwlock.c:234
rrw_enter(fffff3806d16d1d0,1) at rrw_enter+0xc6 sys/kern/kern_rwlock.c:621
VOP_LOCK(fffff38068c2e208,2001) at VOP_LOCK+0xbd sys/kern/vfs_vops.c:527
vn_lock(fffff38068c2e208,2001) at vn_lock+0xa4 sys/kern/vfs_vnops.c:576
vfs_lookup(ffff800033393f60) at vfs_lookup+0x12b sys/kern/vfs_lookup.c:431
namei(ffff800033393f60) at namei+0x7c5 sys/kern/vfs_lookup.c:250
unp_connect(ffff8000015b8f48,fffff3806f091e00,ffff800045fe54e8) at unp_connect+0x29d sys/kern/uipc_usrreq.c:872
uipc_dgram_send(ffff8000015b8f48,fffff3806da78f00,fffff3806f091e00,fffff3806d56c700) at uipc_dgram_send+0x163 sys/kern/uipc_usrreq.c:609
sosend(ffff8000015b8f48,fffff3806f091e00,ffff8000333941e8,0,fffff3806d56c700,c) at sosend+0x804 sys/kern/uipc_socket.c:-1
sendit(ffff800045fe54e8,3,ffff800033394368,c,ffff800033394420) at sendit+0x5a5 sys/kern/uipc_syscalls.c:785
sys_sendmsg(ffff800045fe54e8,ffff8000333944d0,ffff800033394420) at sys_sendmsg+0x246 sys/kern/uipc_syscalls.c:603
syscall(ffff8000333944d0) at syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
syscall(ffff8000333944d0) at syscall+0xbd4 sys/arch/amd64/amd64/trap.c:791
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x1cf481084e0, count: -15
ddb{1}> show registers
rdi                                0
rsi                          0x80000    acpi_pdirpa+0x6be71
rbp               0xffff800033393bd0
rbx                                0
rdx               0xffff8000015fd6c0
rcx               0xffff800045fe54e8
rax                          0x7ffff    acpi_pdirpa+0x6be70
r8                0xffff800033393ab0
r9                0x8080808080808080
r10                0x5054c75fe7c2fbb
r11               0xd48eaa981a45b871
r12               0xfffff380040cd980
r13               0xfffff380048b5240
r14                              0x3
r15               0xffffffff835305d4    substchar+0xacc9
rip               0xffffffff827fe5f5    db_enter+0x25
cs                               0x8
rflags                         0x246
rsp               0xffff800033393bc0
ss                              0x10
db_enter+0x25:  addq    $0x8,%rsp
ddb{1}> show proc
PROC (syz-executor) tid=303970 pid=699 tcnt=2 stat=onproc
    flags process=0 proc=4000000<THREAD>
    runpri=50, usrpri=50, slppri=32, nice=20
    wchan=0x0, wmesg=, ps_single=0x0 scnt=0 ecnt=0
    forw=0xffffffffffffffff, list=0xffff800045fe4028,0xffffffff83ae7090
    process=0xffff800045fdeb80 user=0xffff80003338f000, vmspace=0xfffff3806ced85d0
    estcpu=36, cpticks=0, pctcpu=0.0, user=0, sys=0, intr=0
ddb{1}>