linux-kernel - [WARN] LOCKDEP: MAX_LOCKDEP_CHAIN

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Message-ID: <20250527020252.43684-1-lance.yang@linux.dev>
Date: Tue, 27 May 2025 10:02:52 +0800
From: Lance Yang <ioworker0@...il.com>
To: peterz@...radead.org
Cc: mingo@...hat.com,
	will@...nel.org,
	boqun.feng@...il.com,
	longman@...hat.com,
	linux-kernel@...r.kernel.org
Subject: [WARN] LOCKDEP: MAX_LOCKDEP_CHAIN_HLOCKS too low

From: Lance Yang <lance.yang@...ux.dev>

Hi all,

With CONFIG_LOCKDEP on, I got this warning during kernel builds:

[Tue May 27 00:22:59 2025] BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low!
[Tue May 27 00:22:59 2025] turning off the locking correctness validator.
[Tue May 27 00:22:59 2025] CPU: 56 UID: 0 PID: 3362352 Comm: cc1 Kdump: loaded Tainted: G S                  6.15.0-rc6 #5 PREEMPT(voluntary)
[Tue May 27 00:22:59 2025] Tainted: [S]=CPU_OUT_OF_SPEC
[Tue May 27 00:22:59 2025] Hardware name: New H3C Technologies Co., Ltd. H3C UniServer R4900 G5/RS35M2C16SB, BIOS 5.69 10/18/2023
[Tue May 27 00:22:59 2025] Call Trace:
[Tue May 27 00:22:59 2025]  <TASK>
[Tue May 27 00:22:59 2025]  show_stack+0x4d/0x60
[Tue May 27 00:22:59 2025]  dump_stack_lvl+0x72/0xa0
[Tue May 27 00:22:59 2025]  dump_stack+0x14/0x1a
[Tue May 27 00:22:59 2025]  add_chain_cache+0x304/0x330
[Tue May 27 00:22:59 2025]  __lock_acquire+0x7d3/0xfd0
[Tue May 27 00:22:59 2025]  lock_acquire.part.0+0xb4/0x210
[Tue May 27 00:22:59 2025]  ? bad_range+0xa6/0x320
[Tue May 27 00:22:59 2025]  ? mark_usage+0x68/0x130
[Tue May 27 00:22:59 2025]  lock_acquire+0x62/0x120
[Tue May 27 00:22:59 2025]  ? bad_range+0xa6/0x320
[Tue May 27 00:22:59 2025]  seqcount_lockdep_reader_access+0x3d/0xa0
[Tue May 27 00:22:59 2025]  ? bad_range+0xa6/0x320
[Tue May 27 00:22:59 2025]  bad_range+0xa6/0x320
[Tue May 27 00:22:59 2025]  ? __kasan_check_write+0x18/0x20
[Tue May 27 00:22:59 2025]  expand+0x91/0x3c0
[Tue May 27 00:22:59 2025]  ? __del_page_from_free_list+0x82/0x4b0
[Tue May 27 00:22:59 2025]  rmqueue_bulk+0x13a/0xc00
[Tue May 27 00:22:59 2025]  ? lock_acquire.part.0+0xb4/0x210
[Tue May 27 00:22:59 2025]  __rmqueue_pcplist+0x4a7/0x8f0
[Tue May 27 00:22:59 2025]  rmqueue_pcplist+0xcc/0x2a0
[Tue May 27 00:22:59 2025]  rmqueue.isra.0+0xd26/0x1470
[Tue May 27 00:22:59 2025]  ? stack_trace_save+0x96/0xd0
[Tue May 27 00:22:59 2025]  ? __pfx_stack_trace_save+0x10/0x10
[Tue May 27 00:22:59 2025]  ? stack_depot_save_flags+0x41/0x6a0
[Tue May 27 00:22:59 2025]  ? lock_acquire.part.0+0xb4/0x210
[Tue May 27 00:22:59 2025]  get_page_from_freelist+0x262/0x11a0
[Tue May 27 00:22:59 2025]  ? kasan_save_stack+0x3e/0x50
[Tue May 27 00:22:59 2025]  ? kasan_save_stack+0x2f/0x50
[Tue May 27 00:22:59 2025]  ? __call_rcu_common.constprop.0+0xc4/0x950
[Tue May 27 00:22:59 2025]  ? commit_merge+0x634/0x1100
[Tue May 27 00:22:59 2025]  __alloc_frozen_pages_noprof+0x30e/0x6c0
[Tue May 27 00:22:59 2025]  ? __pfx___alloc_frozen_pages_noprof+0x10/0x10
[Tue May 27 00:22:59 2025]  ? __lock_acquire+0x3dc/0xfd0
[Tue May 27 00:22:59 2025]  ? mark_usage+0x68/0x130
[Tue May 27 00:22:59 2025]  ? policy_nodemask+0x21d/0x350
[Tue May 27 00:22:59 2025]  alloc_pages_mpol+0x163/0x460
[Tue May 27 00:22:59 2025]  ? __pfx_alloc_pages_mpol+0x10/0x10
[Tue May 27 00:22:59 2025]  ? ___slab_alloc+0xe3/0x10f0
[Tue May 27 00:22:59 2025]  ? find_held_lock+0x31/0x90
[Tue May 27 00:22:59 2025]  alloc_frozen_pages_noprof+0x4b/0x130
[Tue May 27 00:22:59 2025]  allocate_slab+0x23a/0x380
[Tue May 27 00:22:59 2025]  ___slab_alloc+0x985/0x10f0
[Tue May 27 00:22:59 2025]  ? find_held_lock+0x31/0x90
[Tue May 27 00:22:59 2025]  ? xfs_buf_item_init+0x7b/0x660 [xfs]
[Tue May 27 00:22:59 2025]  ? xfs_buf_item_init+0x7b/0x660 [xfs]
[Tue May 27 00:22:59 2025]  ? lock_release.part.0+0x20/0x60
[Tue May 27 00:22:59 2025]  ? fs_reclaim_acquire+0x83/0x120
[Tue May 27 00:22:59 2025]  ? xfs_buf_item_init+0x7b/0x660 [xfs]
[Tue May 27 00:22:59 2025]  kmem_cache_alloc_noprof+0x1ed/0x430
[Tue May 27 00:22:59 2025]  ? kmem_cache_alloc_noprof+0x1ed/0x430
[Tue May 27 00:22:59 2025]  xfs_buf_item_init+0x7b/0x660 [xfs]
[Tue May 27 00:22:59 2025]  ? xfs_imap_to_bp+0x10b/0x2b0 [xfs]
[Tue May 27 00:22:59 2025]  ? __pfx_xfs_buf_read_map+0x10/0x10 [xfs]
[Tue May 27 00:22:59 2025]  ? xfs_file_buffered_write+0x14c/0xa50 [xfs]
[Tue May 27 00:22:59 2025]  _xfs_trans_bjoin+0x45/0x130 [xfs]
[Tue May 27 00:22:59 2025]  xfs_trans_read_buf_map+0x38c/0x840 [xfs]
[Tue May 27 00:22:59 2025]  ? __pfx_xfs_trans_read_buf_map+0x10/0x10 [xfs]
[Tue May 27 00:22:59 2025]  ? lock_acquire.part.0+0xb4/0x210
[Tue May 27 00:22:59 2025]  xfs_imap_to_bp+0x10b/0x2b0 [xfs]
[Tue May 27 00:22:59 2025]  ? __pfx_xfs_imap_to_bp+0x10/0x10 [xfs]
[Tue May 27 00:22:59 2025]  ? __kasan_check_read+0x15/0x20
[Tue May 27 00:22:59 2025]  ? do_raw_spin_unlock+0x5d/0x1f0
[Tue May 27 00:22:59 2025]  xfs_inode_item_precommit+0x538/0xc10 [xfs]
[Tue May 27 00:22:59 2025]  ? __pfx_xfs_inode_item_precommit+0x10/0x10 [xfs]
[Tue May 27 00:22:59 2025]  __xfs_trans_commit+0x2a3/0xba0 [xfs]
[Tue May 27 00:22:59 2025]  ? __pfx___xfs_trans_commit+0x10/0x10 [xfs]
[Tue May 27 00:22:59 2025]  ? ktime_get_coarse_real_ts64_mg+0x61/0x1d0
[Tue May 27 00:22:59 2025]  ? __kasan_check_read+0x15/0x20
[Tue May 27 00:22:59 2025]  xfs_trans_commit+0xce/0x150 [xfs]
[Tue May 27 00:22:59 2025]  ? xfs_trans_ijoin+0xcf/0x170 [xfs]
[Tue May 27 00:22:59 2025]  ? __pfx_xfs_trans_commit+0x10/0x10 [xfs]
[Tue May 27 00:22:59 2025]  xfs_vn_update_time+0x1fc/0x440 [xfs]
[Tue May 27 00:22:59 2025]  ? __pfx_xfs_vn_update_time+0x10/0x10 [xfs]
[Tue May 27 00:22:59 2025]  ? __kasan_check_read+0x15/0x20
[Tue May 27 00:22:59 2025]  kiocb_modified+0x1a6/0x240
[Tue May 27 00:22:59 2025]  xfs_file_write_checks.constprop.0+0x451/0x860 [xfs]
[Tue May 27 00:22:59 2025]  xfs_file_buffered_write+0x14c/0xa50 [xfs]
[Tue May 27 00:22:59 2025]  ? __pfx_xfs_file_buffered_write+0x10/0x10 [xfs]
[Tue May 27 00:22:59 2025]  ? ovl_other_xattr_get+0xee/0x160 [overlay]
[Tue May 27 00:22:59 2025]  ? find_held_lock+0x31/0x90
[Tue May 27 00:22:59 2025]  ? __pfx_ovl_other_xattr_get+0x10/0x10 [overlay]
[Tue May 27 00:22:59 2025]  ? mark_usage+0x68/0x130
[Tue May 27 00:22:59 2025]  xfs_file_write_iter+0x553/0x830 [xfs]
[Tue May 27 00:22:59 2025]  do_iter_readv_writev+0x422/0x910
[Tue May 27 00:22:59 2025]  ? lock_acquire.part.0+0xb4/0x210
[Tue May 27 00:22:59 2025]  ? backing_file_write_iter.part.0+0x4ee/0x7e0
[Tue May 27 00:22:59 2025]  ? __pfx_do_iter_readv_writev+0x10/0x10
[Tue May 27 00:22:59 2025]  ? selinux_file_permission+0x389/0x470
[Tue May 27 00:22:59 2025]  ? lock_is_held_type+0xa8/0x120
[Tue May 27 00:22:59 2025]  vfs_iter_write+0x17b/0x7a0
[Tue May 27 00:22:59 2025]  backing_file_write_iter.part.0+0x4ee/0x7e0
[Tue May 27 00:22:59 2025]  ? ovl_real_file+0x16a/0x1b0 [overlay]
[Tue May 27 00:22:59 2025]  backing_file_write_iter+0xc8/0x110
[Tue May 27 00:22:59 2025]  ovl_write_iter+0x2cc/0x450 [overlay]
[Tue May 27 00:22:59 2025]  ? __pfx_ovl_write_iter+0x10/0x10 [overlay]
[Tue May 27 00:22:59 2025]  ? __pfx_ovl_file_end_write+0x10/0x10 [overlay]
[Tue May 27 00:22:59 2025]  ? lock_is_held_type+0xa8/0x120
[Tue May 27 00:22:59 2025]  vfs_write+0x5c1/0x1050
[Tue May 27 00:22:59 2025]  ? __pfx_vfs_write+0x10/0x10
[Tue May 27 00:22:59 2025]  ? ktime_get_coarse_real_ts64+0x44/0xd0
[Tue May 27 00:22:59 2025]  ? lockdep_hardirqs_on_prepare.part.0+0xa3/0x140
[Tue May 27 00:22:59 2025]  ksys_write+0x109/0x200
[Tue May 27 00:22:59 2025]  ? __lock_release.isra.0+0x60/0x160
[Tue May 27 00:22:59 2025]  ? __pfx_ksys_write+0x10/0x10
[Tue May 27 00:22:59 2025]  ? __audit_syscall_entry+0x2ef/0x540
[Tue May 27 00:22:59 2025]  ? irqentry_exit_to_user_mode+0x7d/0x290
[Tue May 27 00:22:59 2025]  ? irqentry_exit+0x6f/0xa0
[Tue May 27 00:22:59 2025]  __x64_sys_write+0x76/0xb0
[Tue May 27 00:22:59 2025]  x64_sys_call+0x28a/0x1d70
[Tue May 27 00:22:59 2025]  do_syscall_64+0x77/0x180
[Tue May 27 00:22:59 2025]  entry_SYSCALL_64_after_hwframe+0x76/0x7e
[Tue May 27 00:22:59 2025] RIP: 0033:0x7f56cbac9687
[Tue May 27 00:22:59 2025] Code: 48 89 fa 4c 89 df e8 58 b3 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
[Tue May 27 00:22:59 2025] RSP: 002b:00007ffe65c16880 EFLAGS: 00000202 ORIG_RAX: 0000000000000001
[Tue May 27 00:22:59 2025] RAX: ffffffffffffffda RBX: 00007f56cba39440 RCX: 00007f56cbac9687
[Tue May 27 00:22:59 2025] RDX: 0000000000001000 RSI: 0000000004735f60 RDI: 0000000000000003
[Tue May 27 00:22:59 2025] RBP: 0000000004735f60 R08: 0000000000000000 R09: 0000000000000000
[Tue May 27 00:22:59 2025] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000001000
[Tue May 27 00:22:59 2025] R13: 00000000046ecad0 R14: 00007f56cbc1fe80 R15: 0000000000000028
[Tue May 27 00:22:59 2025]  </TASK>

$ cat .config|grep CONFIG_LOCKDEP
CONFIG_LOCKDEP_SUPPORT=y
CONFIG_LOCKDEP=y
CONFIG_LOCKDEP_BITS=15
CONFIG_LOCKDEP_CHAINS_BITS=16
CONFIG_LOCKDEP_STACK_TRACE_BITS=19
CONFIG_LOCKDEP_STACK_TRACE_HASH_BITS=14
CONFIG_LOCKDEP_CIRCULAR_QUEUE_BITS=12

Is it safe? Or could this be a real locking issue?

Thanks,
Lance