FYI, we noticed the below changes on

https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git x86/entry_compat
commit 21e1317765f4e19c6bfe63a148d41cc665aa0977 ("x86/entry/64: Fix irqflag tracing wrt context tracking")


+----------------------------------------------------+------------+------------+
|                                                    | 7df46d0040 | 21e1317765 |
+----------------------------------------------------+------------+------------+
| boot_successes                                     | 15         | 0          |
| boot_failures                                      | 0          | 13         |
| WARNING:at_kernel/locking/lockdep.c:#check_flags() | 0          | 13         |
| backtrace:async_page_fault                         | 0          | 13         |
| backtrace:futex_init                               | 0          | 13         |
| backtrace:kernel_init_freeable                     | 0          | 13         |
| BUG:kernel_boot_hang                               | 0          | 3          |
+----------------------------------------------------+------------+------------+


[    3.845227] futex hash table entries: 256 (order: 3, 32768 bytes)
[    3.846772] ------------[ cut here ]------------
[    3.846772] ------------[ cut here ]------------
[    3.847933] WARNING: CPU: 0 PID: 1 at kernel/locking/lockdep.c:3519 check_flags+0x1f6/0x200()
[    3.847933] WARNING: CPU: 0 PID: 1 at kernel/locking/lockdep.c:3519 check_flags+0x1f6/0x200()
[    3.848019] DEBUG_LOCKS_WARN_ON(current->hardirqs_enabled)
[    3.848019] DEBUG_LOCKS_WARN_ON(current->hardirqs_enabled)

[    3.848019] Modules linked in:
[    3.848019] Modules linked in:

[    3.848019] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.3.0-rc4-00078-g21e1317 #1
[    3.848019] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.3.0-rc4-00078-g21e1317 #1
[    3.848019]  ffffffff817321b8
[    3.848019]  ffffffff817321b8 ffff8800001f7bb8 ffff8800001f7bb8 ffffffff812a0eeb ffffffff812a0eeb ffff8800001f7c00 ffff8800001f7c00

[    3.848019]  ffff8800001f7bf0
[    3.848019]  ffff8800001f7bf0 ffffffff810858e2 ffffffff810858e2 ffff8800001f0000 ffff8800001f0000 ffffffff81811c40 ffffffff81811c40

[    3.848019]  0000000000000086
[    3.848019]  0000000000000086 0000000000000000 0000000000000000 0000000000000000 0000000000000000 ffff8800001f7c50 ffff8800001f7c50

[    3.848019] Call Trace:
[    3.848019] Call Trace:
[    3.848019]  [<ffffffff812a0eeb>] dump_stack+0x4b/0x70
[    3.848019]  [<ffffffff812a0eeb>] dump_stack+0x4b/0x70
[    3.848019]  [<ffffffff810858e2>] warn_slowpath_common+0x82/0xc0
[    3.848019]  [<ffffffff810858e2>] warn_slowpath_common+0x82/0xc0
[    3.848019]  [<ffffffff8108596c>] warn_slowpath_fmt+0x4c/0x50
[    3.848019]  [<ffffffff8108596c>] warn_slowpath_fmt+0x4c/0x50
[    3.848019]  [<ffffffff810e534c>] ? do_raw_spin_unlock+0x10c/0x170
[    3.848019]  [<ffffffff810e534c>] ? do_raw_spin_unlock+0x10c/0x170
[    3.848019]  [<ffffffff810dd8d6>] check_flags+0x1f6/0x200
[    3.848019]  [<ffffffff810dd8d6>] check_flags+0x1f6/0x200
[    3.848019]  [<ffffffff810de34c>] lock_is_held+0x4c/0xa0
[    3.848019]  [<ffffffff810de34c>] lock_is_held+0x4c/0xa0
[    3.848019]  [<ffffffff8104c800>] ? native_write_cr0+0x10/0x10
[    3.848019]  [<ffffffff8104c800>] ? native_write_cr0+0x10/0x10
[    3.848019]  [<ffffffff810f6e29>] rcu_read_lock_sched_held+0x79/0xc0
[    3.848019]  [<ffffffff810f6e29>] rcu_read_lock_sched_held+0x79/0xc0
[    3.848019]  [<ffffffff8104c800>] ? native_write_cr0+0x10/0x10
[    3.848019]  [<ffffffff8104c800>] ? native_write_cr0+0x10/0x10
[    3.848019]  [<ffffffff81052e63>] trace_do_page_fault+0x213/0x280
[    3.848019]  [<ffffffff81052e63>] trace_do_page_fault+0x213/0x280
[    3.848019]  [<ffffffff8104c02c>] do_async_page_fault+0x1c/0x100
[    3.848019]  [<ffffffff8104c02c>] do_async_page_fault+0x1c/0x100
[    3.848019]  [<ffffffff814ea4b8>] async_page_fault+0x28/0x30
[    3.848019]  [<ffffffff814ea4b8>] async_page_fault+0x28/0x30
[    3.848019]  [<ffffffff8111b5f0>] ? cmpxchg_futex_value_locked+0x90/0x110
[    3.848019]  [<ffffffff8111b5f0>] ? cmpxchg_futex_value_locked+0x90/0x110
[    3.848019]  [<ffffffff81949c23>] ? tk_debug_sleep_time_init+0x3c/0x3c
[    3.848019]  [<ffffffff81949c23>] ? tk_debug_sleep_time_init+0x3c/0x3c
[    3.848019]  [<ffffffff81949ca8>] futex_init+0x85/0xe7
[    3.848019]  [<ffffffff81949ca8>] futex_init+0x85/0xe7
[    3.848019]  [<ffffffff81000369>] do_one_initcall+0x99/0x260
[    3.848019]  [<ffffffff81000369>] do_one_initcall+0x99/0x260
[    3.848019]  [<ffffffff810abe00>] ? parse_args+0x1d0/0x420
[    3.848019]  [<ffffffff810abe00>] ? parse_args+0x1d0/0x420
[    3.848019]  [<ffffffff81930390>] kernel_init_freeable+0x1dd/0x25e
[    3.848019]  [<ffffffff81930390>] kernel_init_freeable+0x1dd/0x25e
[    3.848019]  [<ffffffff814d8360>] ? rest_init+0x140/0x140
[    3.848019]  [<ffffffff814d8360>] ? rest_init+0x140/0x140
[    3.848019]  [<ffffffff814d836e>] kernel_init+0xe/0xe0
[    3.848019]  [<ffffffff814d836e>] kernel_init+0xe/0xe0
[    3.848019]  [<ffffffff814e88ef>] ret_from_fork+0x3f/0x70
[    3.848019]  [<ffffffff814e88ef>] ret_from_fork+0x3f/0x70
[    3.848019]  [<ffffffff814d8360>] ? rest_init+0x140/0x140
[    3.848019]  [<ffffffff814d8360>] ? rest_init+0x140/0x140
[    3.848019] ---[ end trace fa4c3b1b8f084d8c ]---
[    3.848019] ---[ end trace fa4c3b1b8f084d8c ]---





Thanks,
Ying Huang