witness: lock order reversal:
 1st 0xfffffd806e12a2c0 inode (&ip->i_lock)
 2nd 0xfffffd8079772dc0 fdlock (&newfdp->fd_fd.fd_lock)
lock order "&newfdp->fd_fd.fd_lock"(rwlock) -> "&ip->i_lock"(rrwlock) first seen at:
#0  witness_checkorder+0x6a7 sys/kern/subr_witness.c:879
#1  rw_enter+0xd1 sys/kern/kern_rwlock.c:247
#2  rrw_enter+0x4f sys/kern/kern_rwlock.c:435
#3  VOP_LOCK+0x4b sys/kern/vfs_vops.c:602
#4  vn_closefile+0x119 vn_lock sys/kern/vfs_vnops.c:561 [inline]
#4  vn_closefile+0x119 vn_close sys/kern/vfs_vnops.c:288 [inline]
#4  vn_closefile+0x119 sys/kern/vfs_vnops.c:587
#5  fdrop+0xc9 sys/kern/kern_descrip.c:1273
#6  closef+0x11d sys/kern/kern_descrip.c:1257
#7  finishdup+0x2b6 sys/kern/kern_descrip.c:686
#8  dodup3+0x5c5 sys/kern/kern_descrip.c:377
#9  syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#9  syscall+0x552 sys/arch/amd64/amd64/trap.c:555
#10 Xsyscall+0x128
lock order "&ip->i_lock"(rrwlock) -> "&newfdp->fd_fd.fd_lock"(rwlock) first seen at:
#0  witness_checkorder+0x6a7 sys/kern/subr_witness.c:879
#1  rw_enter_write+0x5b sys/kern/kern_rwlock.c:125
#2  diskmapioctl+0x237 sys/dev/diskmap.c:106
#3  VOP_IOCTL+0x88 sys/kern/vfs_vops.c:290
#4  vn_ioctl+0xb7 sys/kern/vfs_vnops.c:524
#5  sys_ioctl+0x5b8
#6  syscall+0x552 mi_syscall sys/sys/syscall_mi.h:92 [inline]
#6  syscall+0x552 sys/arch/amd64/amd64/trap.c:555
#7  Xsyscall+0x128
Stopped at      db_enter+0x18:  addq    $0x8,%rsp