witness: lock order reversal:
 1st 0xffffffff837a9e08 &cq->cq_mtx (&cq->cq_mtx)
 2nd 0xffffffff83871f10 &sched_lock (&sched_lock)
lock order [1] &cq->cq_mtx (&cq->cq_mtx) -> [2] &sched_lock (&sched_lock)
#0  mtx_enter+0x4a sys/kern/kern_lock.c:260
#1  sleep_setup+0xc6 sys/kern/kern_synch.c:302
#2  msleep_nsec+0x10b sys/kern/kern_synch.c:217
#3  dt_ioctl_record_stop+0xbc sys/dev/dt/dt_dev.c:582
#4  dtclose+0x109 dt_pcb_purge sys/dev/dt/dt_dev.c:-1 [inline]
#4  dtclose+0x109 sys/dev/dt/dt_dev.c:232
#5  spec_close+0x466 sys/kern/spec_vnops.c:-1
#6  VOP_CLOSE+0x132 sys/kern/vfs_vops.c:156
#7  vn_closefile+0x12b vn_close sys/kern/vfs_vnops.c:292 [inline]
#7  vn_closefile+0x12b sys/kern/vfs_vnops.c:615
#8  fdrop+0x121 sys/kern/kern_descrip.c:1280
#9  closef+0x192 sys/kern/kern_descrip.c:1264
#10 fdfree+0x116 sys/kern/kern_descrip.c:1195
#11 exit1+0x576 sys/kern/kern_exit.c:215
#12 sys_exit+0x1a sys/kern/kern_exit.c:-1
#13 syscall+0xb17 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#13 syscall+0xb17 sys/arch/amd64/amd64/trap.c:748
#14 Xsyscall+0x128
lock order [2] &sched_lock (&sched_lock) -> [1] &cq->cq_mtx (&cq->cq_mtx)
#0  mtx_enter+0x4a sys/kern/kern_lock.c:260
#1  clockintr_cancel+0x2f sys/kern/kern_clockintr.c:323
#2  mi_switch+0x16f sys/kern/sched_bsd.c:378
#3  sleep_finish+0x2d8 sys/kern/kern_synch.c:367
#4  sys_futex+0xa99 futex_wait sys/kern/sys_futex.c:301 [inline]
#4  sys_futex+0xa99 sys/kern/sys_futex.c:151
#5  syscall+0xbd4 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#5  syscall+0xbd4 sys/arch/amd64/amd64/trap.c:748
#6  Xsyscall+0x128
Stopped at      db_enter+0x25:  addq    $0x8,%rsp