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Message-ID: <660d8a0d-d490-ab0b-0bd1-e497fc7df1fc@quicinc.com>
Date:   Wed, 13 Dec 2023 21:15:27 +0530
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Content-Language: en-US
From:   Mukesh Ojha <quic_mojha@quicinc.com>
To:     <sdonthineni@nvidia.com>, <tglx@linutronix.de>,
        <Liam.Howlett@oracle.com>,
        Andrew Morton <akpm@linux-foundation.org>
CC:     <maple-tree@lists.infradead.org>, <linux-kernel@vger.kernel.org>
Subject: Maple tree implementation for irq descriptor management
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Content-Transfer-Encoding: 7bit
Precedence: bulk

Hi All,

We are facing an issue in maple tree implementation for irq descriptor
where while allocating a new descriptor in irq_create_mapping(index=300) 
it gets interrupted and get stuck in infinite loop inside
mtree_lookup_walk()=>ma_dead_node(index=287) due to dead node 
(0xFFFFFF8819DECF00) and it is the same node where earlier call
for creating descriptor is about to added.


   (struct maple_node *)0xFFFFFF8819DECF00 = 0xFFFFFF8819DECF00 -> (
     parent = 0xFFFFFF8819DECF00,
     slot = (0x0, 0x011E, 0x011F, 0x0120, 0x0121, 0x0122, 0x0123, 
0x0124, 0x0125, 0x0126, 0x0127, 0x0128, 0x0129, 0x012A, 0x012B, 
0xFFFFFF8813125600, 0xFFFFFF8828BC6E00, 0xFFFFFF8821A4C800, 0x
     pad = 0xFFFFFF8819DECF00,
     rcu = (next = 0x0, func = 0x011E),
     piv_parent = 0x011F,
     parent_slot = 32,
     type = maple_dense = 0,
     slot_len = 33,
     ma_flags = 0,
     mr64 = (
       parent = 0xFFFFFF8819DECF00,
       pivot = (0, 286, 287, 288, 289, 290, 291, 292, 293, 294, 295, 
296, 297, 298, 299),
       slot = (0xFFFFFF8813125600, 0xFFFFFF8828BC6E00, 
0xFFFFFF8821A4C800, 0xFFFFFF8815595A00, 0xFFFFFF8815594400, 
0xFFFFFF8815596800, 0xFFFFFF8815597E00, 0xFFFFFF88155B7C00, 
0xFFFFFF881559400
       pad = (0xFFFFFF8813125600, 0xFFFFFF8828BC6E00, 
0xFFFFFF8821A4C800, 0xFFFFFF8815595A00, 0xFFFFFF8815594400, 
0xFFFFFF8815596800, 0xFFFFFF8815597E00, 0xFFFFFF88155B7C00, 
0xFFFFFF8815594000
       meta = (end = 0, gap = 0)),
     ma64 = (
       parent = 0xFFFFFF8819DECF00,
       pivot = (0, 286, 287, 288, 289, 290, 291, 292, 293),
       slot = (0x0126, 0x0127, 0x0128, 0x0129, 0x012A, 0x012B, 
0xFFFFFF8813125600, 0xFFFFFF8828BC6E00, 0xFFFFFF8821A4C800, 
0xFFFFFF8815595A00),
       gap = (18446743558671647744, 18446743558671656960, 
18446743558671662592, 18446743558671793152, 18446743558671646720, 
18446743558671650304, 18446743558800159744, 18446743558759686144, 18
       meta = (end = 0, gap = 118)),
     alloc = (total = 18446743558747508480, node_count = 0, 
request_count = 0, slot = (0x011E, 0x011F, 0x0120, 0x0121, 0x0122, 
0x0123, 0x0124, 0x0125, 0x0126, 0x0127, 0x0128, 0x0129, 0x012A, 0

Backtrace:

-000|mtree_lookup_walk(inline)
     |  max = 18446744073709551615
     |  next = 0xFFFFFF881B197C1C
     |  offset = 2
     |  node = 0xFFFFFF881B197C00
     |  type = maple_arange_64
-000|mtree_load(mt = ?, index = 287)
     |  index = 287
     |  mas = (tree = 0xFFFFFFC081EB3EC0, index = 287, last = 287, node 
= 0xFFFFFF881B197C1C, min = 0, max = 18446744073709551615, alloc = 0x0, 
depth = 1, offset = 0, mas_flags = 0)
     |  entry = 0x0
-001|irq_to_desc(inline)
-001|generic_handle_irq(irq = ?)
     |  irq = ?
-002|NSX:0x0::0xFFFFFFC07A0E0500(asm)
-003|__handle_irq_event_percpu(:desc = 0xFFFFFF8807D18600)
     |  desc = 0xFFFFFF8807D18600
     |  __already_done = FALSE
     |  irq = 17
     |  retval = IRQ_NONE
     |  res = IRQ_NONE
-004|handle_irq_event_percpu(inline)
     |  desc = 0xFFFFFF8807D18600
     |  retval = IRQ_NONE
-004|handle_irq_event(:desc = 0xFFFFFF8807D18600)
     |  desc = 0xFFFFFF8807D18600
     |  ret = IRQ_NONE
-005|handle_fasteoi_irq(desc = 0xFFFFFF8807D18600)
     |  desc = 0xFFFFFF8807D18600
     |  chip = 0xFFFFFFC081F21288
-006|generic_handle_irq_desc(inline)
-006|handle_irq_desc(inline)
-006|generic_handle_domain_irq(domain = ?, :hwirq = 261)
     |  domain = ?
     |  hwirq = 261
-007|__gic_handle_irq(inline)
     |  irqnr = 261
-007|__gic_handle_irq_from_irqson(inline)
     |  is_nmi = FALSE
     |  irqnr = 261
-007|gic_handle_irq()
-008|call_on_irq_stack(asm)
-009|do_interrupt_handler(inline)
     |  regs = 0xFFFFFFC082142DB0
     |  old_regs = 0x0
-009|__el1_irq(inline)
     |  regs = 0xFFFFFFC082142DB0
-009|el1_interrupt(regs = 0xFFFFFFC082142DB0, handler = 0xFFFFFFC0800100F8)
     |  regs = 0xFFFFFFC082142DB0
     |  handler = 0xFFFFFFC0800100F8
-010|el1h_64_irq_handler(regs = ?)
     |  regs = ?
-011|el1h_64_irq(asm)
  -->|exception
-012|__memcpy(asm)
-013|mas_mab_cp(:mas = 0xFFFFFFC0821434A8, :mas_start = 80, mas_end = ?, 
b_node = 0xFFFFFFC082143108, :mab_start = 80)
     |  mas = 0xFFFFFFC0821434A8
     |  mas_start = 0
     |  b_node = 0xFFFFFFC082143108
     |  mab_start = 0
     |  gaps = 0x0
     |  node = 0xFFFFFF88118A8900
     |  mt = maple_arange_64
     |  __fortify_size = 32
     |  __p_size = 18446744073709551615
     |  __p_size_field = 18446744073709551615
     |  __q_size = 0
-014|mast_fill_bnode(:mast = 0xFFFFFFC0821430C8, :mas = 
0xFFFFFFC0821434A8, :skip = 1)
     |  mast = 0xFFFFFFC0821430C8 -> (
     |    orig_l = 0xFFFFFFC082143000,
     |    orig_r = 0xFFFFFFC082142FC0,
     |    l = 0xFFFFFFC082143080 -> (
     |      tree = 0xFFFFFFC081EB3EC0,
     |      index = 300,
     |      last = 300,
     |      node = 0xFFFFFF881409570C,
     |      min = 285,
     |      max = 293,
     |      alloc = 0xFFFFFF8814094600,
     |      depth = 3,
     |      offset = 4,
     |      mas_flags = 0),
     |    m = 0x0,
     |    r = 0xFFFFFFC082143040 -> (
     |      tree = 0xFFFFFFC081EB3EC0,
     |      index = 300,
     |      last = 300,
     |      node = 0xFFFFFF881409510C,
     |      min = 294,
     |      max = 18446744073709551615,
     |      alloc = 0xFFFFFF8814094600,
     |      depth = 3,
     |      offset = 15,
     |      mas_flags = 0),
     |    free = 0xFFFFFFC082142FA8,
     |    destroy = 0x0,
     |    bn = 0xFFFFFFC082143108)
     |  mas = 0xFFFFFFC0821434A8
     |  skip = 1
     |  split = 0
     |  old = 0x0
-015|mas_split(inline)
     |  mas = 0xFFFFFFC0821434A8
     |  mast = (orig_l = 0xFFFFFFC082143000, orig_r = 
0xFFFFFFC082142FC0, l = 0xFFFFFFC082143080, m = 0x0, r = 
0xFFFFFFC082143040, free = 0xFFFFFFC082142FA8, destroy = 0x0, bn = 
0xFFFFFFC082143108)
     |  l_mas = (tree = 0xFFFFFFC081EB3EC0, index = 300, last = 300, 
node = 0xFFFFFF881409570C, min = 285, max = 293, alloc = 
0xFFFFFF8814094600, depth = 3, offset = 4, mas_flags = 0)
     |  r_mas = (tree = 0xFFFFFFC081EB3EC0, index = 300, last = 300, 
node = 0xFFFFFF881409510C, min = 294, max = 18446744073709551615, alloc 
= 0xFFFFFF8814094600, depth = 3, offset = 15, mas_flags = 0)
     |  prev_l_mas = (tree = 0xFFFFFFC081EB3EC0, index = 300, last = 
300, node = 0x1, min = 0, max = 18446744073709551615, alloc = 0x0, depth 
= 0, offset = 0, mas_flags = 0)
     |  prev_r_mas = (tree = 0xFFFFFFC081EB3EC0, index = 300, last = 
300, node = 0x1, min = 0, max = 18446744073709551615, alloc = 0x0, depth 
= 0, offset = 0, mas_flags = 0)
     |  mat = (head = 0xFFFFFF8819DECF0C, tail = 0xFFFFFF8819DECF0C, 
mtree = 0xFFFFFFC081EB3EC0)
     |  mid_split = 0
-015|mas_commit_b_node(inline)
     |  b_type = maple_leaf_64
     |  node = 0x0
-015|mas_wr_bnode(inline)
     |  b_node = (
     |    parent = 0x0,
     |    pivot = (239, 254, 269, 284, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0),
     |    slot = (0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 
0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0),
     |    padding = (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
0, 0, 0, 0),
     |    gap = (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 
0, 0, 0),
     |    b_end = 4,
     |    type = maple_leaf_64)
-015|mas_wr_modify(:wr_mas = 0xFFFFFFC082143408)
-016|mas_wr_store_entry(:wr_mas = 0xFFFFFFC082143408)
     |  wr_mas = 0xFFFFFFC082143408 -> (
     |    mas = 0xFFFFFFC0821434A8 -> (
     |      tree = 0xFFFFFFC081EB3EC0,
     |      index = 300,
     |      last = 300,
     |      node = 0xFFFFFF88118A891C,
     |      min = 225,
     |      max = 18446744073709551615,
     |      alloc = 0xFFFFFF8814094600,
     |      depth = 3,
     |      offset = 2,
     |      mas_flags = 0),
     |    node = 0xFFFFFF8819DECF00,
     |    r_min = 300,
     |    r_max = 0xFFFFFFFFFFFFFFFF,
     |    type = maple_leaf_64,
     |    offset_end = 15,
     |    node_end = 15,
     |    pivots = 0xFFFFFF8819DECF08 -> 0,
     |    end_piv = 0xFFFFFFFFFFFFFFFF,
     |    slots = 0xFFFFFF8819DECF80 -> 0xFFFFFF8813125600 -> ,
     |    entry = 0xFFFFFF8848A27A00,
     |    content = 0x0)
     |  mas = 0x0
-017|mas_store_gfp(:mas = 0xFFFFFFC0821434A8, :entry = 
0xFFFFFF8848A27A00, :gfp = 3264)
     |  mas = 0xFFFFFFC0821434A8
     |  entry = 0xFFFFFF8848A27A00
     |  gfp = 3264
     |  wr_mas = (mas = 0xFFFFFFC0821434A8, node = 0xFFFFFF8819DECF00, 
r_min = 300, r_max = 18446744073709551615, type = maple_leaf_64, 
offset_end = 15, node_end = 15, pivots = 0xFFFFFF8819DECF08, end_piv = 
18446744073709551615, slots = 0xFFFFFF8819DECF80, entry = 
0xFFFFFF8848A27A00, content = 0x0)
-018|irq_insert_desc(inline)
     |  desc = 0xFFFFFF8848A27A00
     |  mas = (tree = 0xFFFFFFC081EB3EC0, index = 300, last = 300, node 
= 0xFFFFFF88118A891C, min = 225, max = 18446744073709551615, alloc = 
0xFFFFFF8814094600, depth = 3, offset = 2, mas_flags = 0)
-018|alloc_descs(inline)
     |  start = 300
     |  node = -1
     |  affinity = 0x0
     |  owner = 0x0
     |  desc = 0xFFFFFF8848A27A00
-018|__irq_alloc_descs(irq = ?, from = ?, :cnt = 1, node = ?, owner = 
0x0, :affinity = 0x0)
     |  cnt = 1
     |  owner = 0x0
     |  start = 300
-019|irq_domain_alloc_descs(inline)
     |  virq = -1
     |  cnt = 1
     |  hwirq = 0
     |  node = -1
     |  affinity = 0x0
-019|irq_create_mapping_affinity_locked(inline)
     |  domain = 0xFFFFFF885BFF6840
     |  hwirq = 0
     |  affinity = 0x0
     |  virq = 0
-019|irq_create_mapping_affinity(domain = 0xFFFFFF885BFF6840, hwirq = 0, 
affinity = 0x0)
     |  domain = 0xFFFFFF885BFF6840
     |  hwirq = 0
     |  affinity = 0x0
-020|NSX:0x0::0xFFFFFFC07AE32720(asm)
-021|NSX:0x0::0xFFFFFFC07AC9AB38(asm)
-022|NSX:0x0::0xFFFFFFC07B3E49F4(asm)
-023|call_driver_probe(inline)
     |  dev = 0xFFFFFF8848951848
     |  drv = 0xFFFFFFC07AFD90C0
     |  ret = 0
-023|really_probe(:dev = 0xFFFFFF8848951848, :drv = 0xFFFFFFC07AFD90C0)
     |  dev = 0xFFFFFF8848951848
     |  drv = 0xFFFFFFC07AFD90C0
     |  link_ret = 0
     |  test_remove = FALSE
-024|__driver_probe_device(drv = 0xFFFFFFC07AFD90C0, :dev = 
0xFFFFFF8848951848)
     |  drv = 0xFFFFFFC07AFD90C0
     |  dev = 0xFFFFFF8848951848
     |  ret = 0
-025|driver_probe_device(drv = 0xFFFFFFC07AFD90C0, :dev = 
0xFFFFFF8848951848)
     |  drv = 0xFFFFFFC07AFD90C0
     |  dev = 0xFFFFFF8848951848
     |  trigger_count = 783
     |  ret = 0
-026|__device_attach_driver(drv = 0xFFFFFFC07AFD90C0, :_data = 
0xFFFFFFC0821437E8)
     |  drv = 0xFFFFFFC07AFD90C0
     |  _data = 0xFFFFFFC0821437E8
     |  data = 0xFFFFFFC0821437E8
     |  dev = 0xFFFFFF8848951848
     |  ret = ???
-027|bus_for_each_drv(bus = ?, :start = 0xFFFFFFC0821437E0, :data = 
0xFFFFFFC0821437E8, fn = 0xFFFFFFC08089C798)
     |  data = 0xFFFFFFC0821437E8
     |  fn = 0xFFFFFFC08089C798
     |  i = (i_klist = 0xFFFFFF881ED5C6C8, i_cur = 0xFFFFFF8823649968)
     |  sp = 0xFFFFFF881ED5C600
     |  error = 0
-028|__device_attach(dev = 0xFFFFFF8848951848)
     |  dev = 0xFFFFFF8848951848
     |  async = FALSE
     |  ret = 0
     |  data = (dev = 0xFFFFFF8848951848, check_async = TRUE, want_async 
= FALSE, have_async = FALSE)
-029|device_initial_probe(dev = 0xFFFFFF8848951848)
     |  dev = 0xFFFFFF8848951848
-030|bus_probe_device(:dev = 0xFFFFFF8848951848)
     |  dev = 0xFFFFFF8848951848
     |  sp = 0xFFFFFF881ED5C600
     |  sif = 0x0
-031|device_add(:dev = 0xFFFFFF8848951848)
     |  dev = 0xFFFFFF8848951848
     |  sp = 0x0
     |  parent = 0xFFFFFF8851B70080
     |  class_intf = 0x0
     |  error = 0
     |  glue_dir = 0x0
-032|device_register(dev = 0xFFFFFF8848951848)
     |  dev = 0xFFFFFF8848951848
-033|NSX:0x0::0xFFFFFFC07B3E3944(asm)
-034|NSX:0x0::0xFFFFFFC07B3E3C20(asm)
-035|NSX:0x0::0xFFFFFFC07B6B5148(asm)
-036|platform_probe(:_dev = 0xFFFFFF8848956010)
     |  _dev = 0xFFFFFF8848956010
     |  drv = 0xFFFFFFC07B299648
     |  ret = 0
-037|call_driver_probe(inline)
     |  dev = 0xFFFFFF8848956010
     |  drv = 0xFFFFFFC07B299678
     |  ret = 0
-037|really_probe(:dev = 0xFFFFFF8848956010, :drv = 0xFFFFFFC07B299678)
     |  dev = 0xFFFFFF8848956010
     |  drv = 0xFFFFFFC07B299678
     |  link_ret = 0
     |  test_remove = FALSE
-038|__driver_probe_device(drv = 0xFFFFFFC07B299678, :dev = 
0xFFFFFF8848956010)
     |  drv = 0xFFFFFFC07B299678
     |  dev = 0xFFFFFF8848956010
     |  ret = 0
-039|driver_probe_device(drv = 0xFFFFFFC07B299678, :dev = 
0xFFFFFF8848956010)
     |  drv = 0xFFFFFFC07B299678
     |  dev = 0xFFFFFF8848956010
     |  trigger_count = 781
     |  ret = 0
-040|__device_attach_driver(drv = 0xFFFFFFC07B299678, :_data = 
0xFFFFFFC082143BA8)
     |  drv = 0xFFFFFFC07B299678
     |  _data = 0xFFFFFFC082143BA8
     |  data = 0xFFFFFFC082143BA8
     |  dev = 0xFFFFFF8848956010
     |  ret = ???
-041|bus_for_each_drv(bus = ?, :start = 0xFFFFFFC082143BA0, :data = 
0xFFFFFFC082143BA8, fn = 0xFFFFFFC08089C798)
     |  data = 0xFFFFFFC082143BA8
     |  fn = 0xFFFFFFC08089C798
     |  i = (i_klist = 0xFFFFFF8804034AC8, i_cur = 0xFFFFFF8821B45068)
     |  sp = 0xFFFFFF8804034A00
     |  error = 0
-042|__device_attach(dev = 0xFFFFFF8848956010)
     |  dev = 0xFFFFFF8848956010
     |  async = FALSE
     |  ret = 0
     |  data = (dev = 0xFFFFFF8848956010, check_async = TRUE, want_async 
= FALSE, have_async = FALSE)
-043|device_initial_probe(dev = 0xFFFFFF8848956010)
     |  dev = 0xFFFFFF8848956010
-044|bus_probe_device(:dev = 0xFFFFFF8848956010)
     |  dev = 0xFFFFFF8848956010
     |  sp = 0xFFFFFF8804034A00
     |  sif = 0x0
-045|device_add(:dev = 0xFFFFFF8848956010)
     |  dev = 0xFFFFFF8848956010
     |  sp = 0x0
     |  parent = 0xFFFFFF8851BCE410
     |  class_intf = 0x0
     |  error = 0
     |  glue_dir = 0x0
-046|platform_device_add(pdev = 0xFFFFFF8848956000)
     |  pdev = 0xFFFFFF8848956000
-047|NSX:0x0::0xFFFFFFC07B73DD48(asm)
-048|process_one_work(:worker = 0xFFFFFF880300AF00, work = 
0xFFFFFF8833434930)
     |  worker = 0xFFFFFF880300AF00
     |  work = 0xFFFFFF8833434930
     |  pool = 0xFFFFFF8B7DCAA180
     |  pwq = 0xFFFFFF8B7DCAE600
     |  collision = 0x0
     |  work_data = 18446743573308827141
-049|worker_thread(:__worker = 0xFFFFFF880300AF00)
     |  __worker = 0xFFFFFF880300AF00
     |  worker = 0x0
     |  pool = 0xFFFFFF8B7DCAA180
-050|kthread(_create = 0xFFFFFF8803290240)
     |  _create = 0xFFFFFF8803290240
     |  param = (sched_priority = 0)
     |  create = 0x0
     |  data = 0xFFFFFF880300AF00
     |  threadfn = 0x0
     |  ret = ???
     |  self = 0xFFFFFF88030D8180
     |  done = 0xFFFFFFC082133CB8
-051|ret_from_fork(asm)
  ---|end of frame

-Mukesh