[Bug 265795] panic: vm_page_dequeue_deferred: page has unexpected queue state

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265795

--- Comment #9 from John F. Carr <jfc@mit.edu> ---
(kgdb) p/x * m
$2 = {plinks = {q = {tqe_next = 0xffffa09ebafa1750, tqe_prev =
0xffffa09f01180128}, s = {ss = {
        sle_next = 0xffffa09ebafa1750}}, memguard = {p = 0xffffa09ebafa1750, 
      v = 0xffffa09f01180128}, uma = {slab = 0xffffa09ebafa1750, zone =
0xffffa09f01180128}}, 
  listq = {tqe_next = 0xffffa09ebafa1750, tqe_prev = 0xffffa08b72e10048},
object = 0x0, 
  pindex = 0x79, phys_addr = 0x8f0e5c8000, md = {pv_list = {tqh_first = 0x0, 
      tqh_last = 0xffffa09ef59d3778}, pv_gen = 0x6ba, pv_memattr = 0x2},
ref_count = 0x0, 
  busy_lock = 0xfffffffe, a = {{flags = 0x10, queue = 0xff, act_count = 0x0},
_bits = 0xff0010}, 
  order = 0xd, pool = 0x0, flags = 0x1, oflags = 0x0, psind = 0x0, segind =
0x3, valid = 0xff, 
  dirty = 0x0}


And in the vm_page_dequeue_deferred frame,

(kgdb) p/x old
$11 = {{flags = 0x4bdc, queue = <optimized out>, act_count = 0x0}, _bits =
<optimized out>}

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