linux-kernel - [lkp] [regression] 9bd5b8dffd: BUG: unable to handle kernel NULL pointer dereference at (null)

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Date:	Mon, 23 Nov 2015 16:24:51 +0800
From:	kernel test robot <ying.huang@...ux.intel.com>
TO:	Amir Vadai <amirv@...lanox.com>
CC:	Alaa Hleihel <alaa@...lanox.com>
Subject: [lkp] [regression] 9bd5b8dffd: BUG: unable to handle kernel NULL
 pointer dereference at           (null)

FYI, we noticed the below changes on

https://github.com/alaahl/linux.git for-upstream
commit 9bd5b8dffd77ec3d258425e9f4dd4f31c41a30b0 ("regression: Disable FENTRY")


+------------------------------------------+------------+------------+
|                                          | e2f9dc3bd2 | 9bd5b8dffd |
+------------------------------------------+------------+------------+
| boot_successes                           | 68         | 0          |
| boot_failures                            | 2          | 26         |
| BUG:kernel_test_oversize                 | 2          |            |
| BUG:unable_to_handle_kernel              | 0          | 26         |
| Oops                                     | 0          | 26         |
| RIP:copy_process                         | 0          | 26         |
| Kernel_panic-not_syncing:Fatal_exception | 0          | 26         |
| backtrace:_do_fork                       | 0          | 26         |
+------------------------------------------+------------+------------+



[   78.786803] Running tests again, along with the function tracer
[   78.788785] Running tests on trace events:
[   78.790384] Testing event sys_exit: 
[   78.791562] BUG: unable to handle kernel NULL pointer dereference at           (null)
[   78.795018] IP: [<ffffffff810963c5>] copy_process+0x1f/0x1826
[   78.796916] PGD 0 
[   78.798172] Oops: 0000 [#1] SMP 
[   78.799768] CPU: 0 PID: 2 Comm: kthreadd Not tainted 4.4.0-rc1-00163-g9bd5b8d #1
[   78.802492] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[   78.805397] task: ffff880013f0e9c0 ti: ffff880013f24000 task.ti: ffff880013f24000
[   78.818230] RIP: 0010:[<ffffffff810963c5>]  [<ffffffff810963c5>] copy_process+0x1f/0x1826
[   78.821196] RSP: 0000:ffff880013f27db0  EFLAGS: 00010282
[   78.822776] RAX: ffffffff810b23a7 RBX: ffff8800154f44c0 RCX: 0000000000000000
[   78.824760] RDX: ffff8800154f4498 RSI: ffffffff810b23a7 RDI: 0000000000800711
[   78.834825] RBP: ffff880013f27e80 R08: 0000000000000000 R09: 0000000000000000
[   78.838880] R10: 0000000000000000 R11: ffffffff8202854a R12: ffffffff810b23a7
[   78.840819] R13: 0000000000000000 R14: 0000000000800711 R15: ffff8800154f4498
[   78.842683] FS:  0000000000000000(0000) GS:ffff880014a00000(0000) knlGS:0000000000000000
[   78.845266] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[   78.855092] CR2: 0000000000000000 CR3: 0000000001e08000 CR4: 00000000000006f0
[   78.859161] Stack:
[   78.860224]  0000000000000000 ffff8800154f4498 ffff880013f27e78 ffffffff819c0ffe
[   78.863239]  0000000000000800 ffffffff820287ce 0000000000000000 ffffffff810b2b7c
[   78.874384]  ffff880013f27ef8 ffffffff8110a90f ffffffff81098026 ffff8800154f44c0
[   78.879410] Call Trace:
[   78.880440]  [<ffffffff819c0ffe>] ? trace+0x5f/0x93
[   78.881843]  [<ffffffff820287ce>] ? event_trace_self_tests_init+0x149/0x149
[   78.883582]  [<ffffffff810b2b7c>] ? kthreadd+0xf4/0x13a
[   78.885041]  [<ffffffff8110a90f>] ? ftrace_ops_no_ops+0x151/0x191
[   78.894861]  [<ffffffff81098026>] ? kernel_thread+0x4/0x2b
[   78.898665]  [<ffffffff810b23a7>] ? __kthread_parkme+0x87/0x87
[   78.900426]  [<ffffffff810b23a7>] ? __kthread_parkme+0x87/0x87
[   78.902183]  [<ffffffff810b23a7>] ? __kthread_parkme+0x87/0x87
[   78.903943]  [<ffffffff81097d69>] _do_fork+0xa8/0x361
[   78.913773]  [<ffffffff810b23a7>] ? __kthread_parkme+0x87/0x87
[   78.915511]  [<ffffffff8109802b>] ? kernel_thread+0x9/0x2b
[   78.919281]  [<ffffffff8109804b>] kernel_thread+0x29/0x2b
[   78.920931]  [<ffffffff810b2b7c>] kthreadd+0xf4/0x13a
[   78.922538]  [<ffffffff810b2a88>] ? kthread_stop+0x10c/0x10c
[   78.924251]  [<ffffffff819bf35f>] ret_from_fork+0x3f/0x70
[   78.933953]  [<ffffffff810b2a88>] ? kthread_stop+0x10c/0x10c
[   78.937784] Code: 01 48 89 de e8 dd 84 0e 00 5b 5d c3 55 48 89 e5 41 57 41 56 41 55 41 54 41 52 53 4c 8d 55 10 48 81 ec a0 00 00 00 e8 cb ab 92 00 <49> 8b 02 48 89 7d b8 48 89 b5 50 ff ff ff 48 89 95 48 ff ff ff 
[   78.959947] RIP  [<ffffffff810963c5>] copy_process+0x1f/0x1826
[   78.961807]  RSP <ffff880013f27db0>
[   78.963149] CR2: 0000000000000000
[   78.964464] ---[ end trace bce589f6b0fc4786 ]---
[   78.974094] Kernel panic - not syncing: Fatal exception





Thanks,
Ying Huang

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