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Date:   Wed, 13 Dec 2023 14:35:58 -0500
From:   "Liam R. Howlett" <Liam.Howlett@Oracle.com>
To:     Mukesh Ojha <quic_mojha@quicinc.com>
Cc:     sdonthineni@nvidia.com, tglx@linutronix.de,
        Andrew Morton <akpm@linux-foundation.org>,
        maple-tree@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: Maple tree implementation for irq descriptor management
Message-ID: <20231213193558.zwqppxa4ap7xvrfr@revolver>
References: <660d8a0d-d490-ab0b-0bd1-e497fc7df1fc@quicinc.com>
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* Mukesh Ojha <quic_mojha@quicinc.com> [231213 10:46]:
> 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.

What kernel version?

There was an issue with the tree a while back which could result in this
happening [1], although I was never successful in causing it or seeing
it before now.

Looking though the dump below, it appears that you do not have the
patches in [1] as they should prevent the node from being marked dead
until the new node exists in the tree.  Note that this occurs in your
case in splitting of the node which should be fixed in the last patch of
the series.

[1] https://lore.kernel.org/all/20230804165951.2661157-3-Liam.Howlett@oracle.com/T/#u

Thanks,
Liam

> 
> 
>   (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