FYI, we noticed the below changes on

git://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git x86/entry
commit fbca3588d325bf1803ce0eecb35b27705f95ef7c ("x86: Switch all C consumers of kernel_stack to this_cpu_sp0")


+------------------------------------------+------------+------------+
|                                          | 173dfe42d9 | fbca3588d3 |
+------------------------------------------+------------+------------+
| boot_successes                           | 99         | 0          |
| boot_failures                            | 1          | 30         |
| BUG:kernel_test_crashed                  | 1          |            |
| BUG:unable_to_handle_kernel              | 0          | 30         |
| Oops                                     | 0          | 30         |
| EIP_is_at__queue_work                    | 0          | 30         |
| Kernel_panic-not_syncing:Fatal_exception | 0          | 30         |
| backtrace:do_exit                        | 0          | 30         |
+------------------------------------------+------------+------------+


[    0.095002] ---------------------------------
[    0.096003] smpboot: Total of 2 processors activated (10774.22 BogoMIPS)
[    0.098207] devtmpfs: unable to create devtmpfs -14
[    0.102790] BUG: unable to handle kernel NULL pointer dereference at 00000080
[    0.103000] IP: [<c10577ff>] __queue_work+0x1f/0x270
[    0.103000] *pdpt = 0000000000000000 *pde = f000ff53f000ff53 
[    0.103000] Oops: 0000 [#1] SMP 
[    0.103000] Modules linked in:
[    0.103000] CPU: 0 PID: 17 Comm: kdevtmpfs Not tainted 4.0.0-rc2-00085-g8880ab4 #14
[    0.103000] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    0.103000] task: d2c8f0b0 ti: d2cafff8 task.ti: d2cb0000
[    0.103000] EIP: 0060:[<c10577ff>] EFLAGS: 00010046 CPU: 0
[    0.103000] EIP is at __queue_work+0x1f/0x270
[    0.103000] EAX: 00000082 EBX: 00000296 ECX: c18e0b4c EDX: 00000000
[    0.103000] ESI: c18e0b4c EDI: 00000000 EBP: d2cb1edc ESP: d2cb1eb0
[    0.103000]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[    0.103000] CR0: 8005003b CR2: 00000080 CR3: 01982000 CR4: 000006b0
[    0.103000] Stack:
[    0.103000]  d2c8f0b0 c1075370 d2cb1eb8 d2cb1eb8 d2c37c00 d2cb1ed8 d2c37c00 00000020
[    0.103000]  00000296 00000020 00000000 d2cb1ef0 c1057a81 c18e0b80 00000292 00000000
[    0.103000]  d2cb1f00 c158950e d2c94330 00000000 d2cb1f0c c105da1d d2c8f0b0 d2cb1f1c
[    0.103000] Call Trace:
[    0.103000]  [<c1075370>] ? wait_woken+0x90/0x90
[    0.103000]  [<c1057a81>] queue_work_on+0x31/0x60
[    0.103000]  [<c158950e>] __put_net+0x4e/0x60
[    0.103000]  [<c105da1d>] free_nsproxy+0x4d/0x70
[    0.103000]  [<c105db45>] switch_task_namespaces+0x65/0x70
[    0.103000]  [<c105db5a>] exit_task_namespaces+0xa/0x10
[    0.103000]  [<c104691e>] do_exit+0x2ae/0x970
[    0.103000]  [<c160e37f>] ? __schedule+0x25f/0x900
[    0.103000]  [<c145dcf0>] ? handle_remove+0x290/0x290
[    0.103000]  [<c105cf69>] kthread+0xa9/0xd0
[    0.103000]  [<c1612e21>] ret_from_kernel_thread+0x21/0x30
[    0.103000]  [<c105cec0>] ? kthread_create_on_node+0x110/0x110
[    0.103000] Code: 4d ec c6 05 90 65 8e c1 01 eb 95 90 55 89 e5 57 89 d7 56 89 ce 53 83 ec 20 89 45 f0 9c 58 8d 74 26 00 f6 c4 02 0f 85 41 01 00 00 <8b> 87 80 00 00 00 a9 00 00 01 00 0f 85 60 01 00 00 8b 55 f0 83
[    0.103000] EIP: [<c10577ff>] __queue_work+0x1f/0x270 SS:ESP 0068:d2cb1eb0
[    0.103000] CR2: 0000000000000080
[    0.103000] ---[ end trace 3982df2909746188 ]---
[    0.103000] Kernel panic - not syncing: Fatal exception



Thanks,
Ying Huang


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