witness: thread 0xffff80002a3a6558 exiting with the following locks held:
shared rwlock netlock r = 0 (0xffffffff83867110)
#0  witness_lock+0x5bb stacktrace_save sys/sys/stacktrace.h:37 [inline]
#0  witness_lock+0x5bb sys/kern/subr_witness.c:1160
#1  rw_do_enter_read+0x36e sys/kern/kern_rwlock.c:397
#2  sysctl_file+0xb13 sys/kern/kern_sysctl.c:1767
#3  kern_sysctl+0x251 sys/kern/kern_sysctl.c:526
#4  sys_sysctl+0x3f2 sys/kern/kern_sysctl.c:-1
#5  syscall+0xbc6 mi_syscall sys/sys/syscall_mi.h:176 [inline]
#5  syscall+0xbc6 sys/arch/amd64/amd64/trap.c:579
#6  Xsyscall+0x128
panic: thread 0xffff80002a3a6558 cannot exit while holding sleeplocks
Starting stack trace...
panic(ffffffff83356683) at panic+0x1d0 sys/kern/subr_prf.c:229
witness_thread_exit(ffff80002a3a6558) at witness_thread_exit+0x426 sys/kern/subr_witness.c:1408
reaper(ffff8000ffffd1f8) at reaper+0x1ba sys/kern/kern_exit.c:492
end trace frame: 0x0, count: 254
End of stack trace.