FYI, we noticed the below changes on

git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
commit 80ca8c3a84c74a87977558861bb8eef650732912 ("rhashtable: Lower/upper bucket may map to same lock while shrinking")


+--------------------------------------------------------+------------+------------+
|                                                        | df8a39defa | 80ca8c3a84 |
+--------------------------------------------------------+------------+------------+
| boot_successes                                         | 0          | 0          |
| boot_failures                                          | 240        | 20         |
| BUG:spinlock_trylock_failure_on_UP_on_CPU              | 240        |            |
| backtrace:rhashtable_shrink                            | 240        |            |
| backtrace:test_rht_init                                | 240        |            |
| backtrace:kernel_init_freeable                         | 240        |            |
| WARNING:at_kernel/locking/mutex.c:#mutex_lock_nested() | 0          | 20         |
| PANIC:double_fault                                     | 0          | 20         |
| RIP:device_create                                      | 0          | 20         |
| Kernel_panic-not_syncing:Machine_halted                | 0          | 20         |
| backtrace:rht_deferred_worker                          | 0          | 20         |
+--------------------------------------------------------+------------+------------+



[    0.346236] ------------[ cut here ]------------
[    0.346236] ------------[ cut here ]------------
[    0.347000] WARNING: CPU: 0 PID: 11 at kernel/locking/mutex.c:570 mutex_lock_nested+0x425/0x570()
[    0.347000] WARNING: CPU: 0 PID: 11 at kernel/locking/mutex.c:570 mutex_lock_nested+0x425/0x570()
[    0.347000] DEBUG_LOCKS_WARN_ON(l->magic != l)
[    0.347000] DEBUG_LOCKS_WARN_ON(l->magic != l)

[    0.347000] Modules linked in:
[    0.347000] Modules linked in:

[    0.347000] CPU: 0 PID: 11 Comm: kworker/0:1 Not tainted 3.19.0-rc4-ge888419 #667
[    0.347000] CPU: 0 PID: 11 Comm: kworker/0:1 Not tainted 3.19.0-rc4-ge888419 #667
[    0.347000] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    0.347000] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    0.347000] Workqueue: events rht_deferred_worker
[    0.347000] Workqueue: events rht_deferred_worker

[    0.347000]  ffff88007695fc28
[    0.347000]  ffff88007695fc28 ffff88007695fbd8 ffff88007695fbd8 ffffffff8149dd9b ffffffff8149dd9b ffff88007695fc18 ffff88007695fc18

[    0.347000]  ffffffff8109b0bc
[    0.347000]  ffffffff8109b0bc ffff88007695fc58 ffff88007695fc58 ffffffff814a32f4 ffffffff814a32f4 ffff880076883d90 ffff880076883d90

[    0.347000]  0000000000000246
[    0.347000]  0000000000000246 ffff88007695fca8 ffff88007695fca8 ffff8800769022a0 ffff8800769022a0 ffff88007695fc78 ffff88007695fc78

[    0.347000] Call Trace:
[    0.347000] Call Trace:
[    0.347000]  [<ffffffff8149dd9b>] dump_stack+0x19/0x1b
[    0.347000]  [<ffffffff8149dd9b>] dump_stack+0x19/0x1b
[    0.347000]  [<ffffffff8109b0bc>] warn_slowpath_common+0xca/0xe3
[    0.347000]  [<ffffffff8109b0bc>] warn_slowpath_common+0xca/0xe3
[    0.347000]  [<ffffffff814a32f4>] ? mutex_lock_nested+0x425/0x570
[    0.347000]  [<ffffffff814a32f4>] ? mutex_lock_nested+0x425/0x570
[    0.347000]  [<ffffffff8109b11b>] warn_slowpath_fmt+0x46/0x48
[    0.347000]  [<ffffffff8109b11b>] warn_slowpath_fmt+0x46/0x48
[    0.347000]  [<ffffffff814a32f4>] mutex_lock_nested+0x425/0x570
[    0.347000]  [<ffffffff814a32f4>] mutex_lock_nested+0x425/0x570
[    0.347000]  [<ffffffff812928a2>] rht_deferred_worker+0x23/0x94
[    0.347000]  [<ffffffff812928a2>] rht_deferred_worker+0x23/0x94
[    0.347000]  [<ffffffff810b6c3b>] process_one_work+0x361/0x558
[    0.347000]  [<ffffffff810b6c3b>] process_one_work+0x361/0x558
[    0.347000]  [<ffffffff810b7759>] worker_thread+0x496/0x5e6
[    0.347000]  [<ffffffff810b7759>] worker_thread+0x496/0x5e6
[    0.347000]  [<ffffffff810b72c3>] ? rescuer_thread+0x462/0x462
[    0.347000]  [<ffffffff810b72c3>] ? rescuer_thread+0x462/0x462
[    0.347000]  [<ffffffff810b72c3>] ? rescuer_thread+0x462/0x462
[    0.347000]  [<ffffffff810b72c3>] ? rescuer_thread+0x462/0x462
[    0.347000]  [<ffffffff810bbfad>] kthread+0x118/0x120
[    0.347000]  [<ffffffff810bbfad>] kthread+0x118/0x120
[    0.347000]  [<ffffffff810c8189>] ? local_clock+0x2b/0x34
[    0.347000]  [<ffffffff810c8189>] ? local_clock+0x2b/0x34
[    0.347000]  [<ffffffff810bbe95>] ? init_completion+0x24/0x24
[    0.347000]  [<ffffffff810bbe95>] ? init_completion+0x24/0x24
[    0.347000]  [<ffffffff814a6c3a>] ret_from_fork+0x7a/0xb0
[    0.347000]  [<ffffffff814a6c3a>] ret_from_fork+0x7a/0xb0
[    0.347000]  [<ffffffff810bbe95>] ? init_completion+0x24/0x24
[    0.347000]  [<ffffffff810bbe95>] ? init_completion+0x24/0x24
[    0.347000] ---[ end trace e632e964ce5a24c7 ]---
[    0.347000] ---[ end trace e632e964ce5a24c7 ]---



Thanks,
Huang, Ying