linux-kernel - [lkp] [loop] 1d5ab0e98c: BUG: unable to handle kernel NULL pointer dereference at 0000000000000008

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Date:	Fri, 13 Nov 2015 14:24:34 +0800
From:	kernel test robot <ying.huang@...ux.intel.com>
TO:	Seth Forshee <seth.forshee@...onical.com>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: [lkp] [loop] 1d5ab0e98c: BUG: unable to handle kernel NULL pointer
 dereference at 0000000000000008

FYI, we noticed the below changes on

git://kernel.ubuntu.com/sforshee/linux.git userns-mounts
commit 1d5ab0e98cf0282077fc1ac2b261d5237b26073e ("loop: Add loop filesystem")


+------------------------------------------+------------+------------+
|                                          | 87cad79097 | 1d5ab0e98c |
+------------------------------------------+------------+------------+
| boot_successes                           | 12         | 0          |
| boot_failures                            | 0          | 12         |
| BUG:unable_to_handle_kernel              | 0          | 12         |
| Oops                                     | 0          | 12         |
| RIP:loopfs_sb_from_inode                 | 0          | 12         |
| Kernel_panic-not_syncing:Fatal_exception | 0          | 12         |
| backtrace:loop_add                       | 0          | 12         |
| backtrace:loop_init                      | 0          | 12         |
| backtrace:kernel_init_freeable           | 0          | 12         |
+------------------------------------------+------------+------------+


[    3.923208] Floppy drive(s): fd0 is 1.44M
[    3.935689] FDC 0 is a S82078B
[    3.973524] brd: module loaded
[    3.980099] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
[    3.981035] IP: [<ffffffff816de9e0>] loopfs_sb_from_inode+0x23/0x29
[    3.981035] PGD 0 
[    3.981035] Oops: 0000 [#1] SMP 
[    3.981035] Modules linked in:
[    3.981035] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.3.0-rc1-00034-g1d5ab0e #413
[    3.981035] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[    3.981035] task: ffff8800130a0000 ti: ffff8800130a8000 task.ti: ffff8800130a8000
[    3.981035] RIP: 0010:[<ffffffff816de9e0>]  [<ffffffff816de9e0>] loopfs_sb_from_inode+0x23/0x29
[    3.981035] RSP: 0018:ffff8800130abdc8  EFLAGS: 00010246
[    3.981035] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff880013c0ce06
[    3.981035] RDX: 0000000000000000 RSI: 0000000000700000 RDI: 0000000000000000
[    3.981035] RBP: ffff8800130abdc8 R08: 00000000be164353 R09: 0000000000000006
[    3.981035] R10: ffff8800130abc10 R11: 00000000001db1f8 R12: 0000000000000000
[    3.981035] R13: ffff8800001cdce0 R14: ffff8800150f6618 R15: 0000000000700000
[    3.981035] FS:  0000000000000000(0000) GS:ffff880013c00000(0000) knlGS:0000000000000000
[    3.981035] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[    3.981035] CR2: 0000000000000008 CR3: 000000000220f000 CR4: 00000000000006f0
[    3.981035] Stack:
[    3.981035]  ffff8800130abe18 ffffffff816dea08 ffff8800150f6618 0000000000000000
[    3.981035]  0000000000000000 ffff8800130abc10 0000000000000000 ffff8800001cdce0
[    3.981035]  ffff8800150f6618 ffff8800001cda68 ffff8800130abe60 ffffffff816dc9d2
[    3.981035] Call Trace:
[    3.981035]  [<ffffffff816dea08>] loopfs_new_dev+0x22/0x1a0
[    3.981035]  [<ffffffff816dc9d2>] loop_add+0x270/0x2e5
[    3.981035]  [<ffffffff825df45e>] loop_init+0x10c/0x162
[    3.981035]  [<ffffffff825df352>] ? brd_init+0x128/0x128
[    3.981035]  [<ffffffff81000312>] do_one_initcall+0xe7/0x177
[    3.981035]  [<ffffffff825930ec>] kernel_init_freeable+0x1c2/0x24a
[    3.981035]  [<ffffffff81c0f989>] ? rest_init+0x140/0x140
[    3.981035]  [<ffffffff81c0f997>] kernel_init+0xe/0xd4
[    3.981035]  [<ffffffff81c1db2f>] ret_from_fork+0x3f/0x70
[    3.981035]  [<ffffffff81c0f989>] ? rest_init+0x140/0x140
[    3.981035] Code: 41 5f 5d 49 8d 62 f8 c3 0f 1f 44 00 00 55 48 85 ff 48 89 e5 74 0e 48 8b 47 28 48 81 78 60 70 6f 6f 6c 74 0b 48 8b 05 18 e3 f7 01 <48> 8b 40 08 5d c3 0f 1f 44 00 00 55 48 89 e5 41 57 41 89 f7 41 
[    3.981035] RIP  [<ffffffff816de9e0>] loopfs_sb_from_inode+0x23/0x29
[    3.981035]  RSP <ffff8800130abdc8>
[    3.981035] CR2: 0000000000000008
[    3.981035] ---[ end trace 58d15d1469c4ff12 ]---
[    3.981035] Kernel panic - not syncing: Fatal exception





Thanks,
Ying Huang

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