linux-kernel - [LKP] [userns] BUG: unable to handle kernel NULL pointer dereference at (null)

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Date:	Mon, 15 Dec 2014 11:21:01 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, LKP ML <lkp@...org>
Subject: [LKP] [userns] BUG: unable to handle kernel NULL pointer
 dereference at (null)

FYI, we noticed the below changes on

git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace.git for-testing
commit bbea5f5532501fdd67f46442ba7b1122d7ff3123 ("userns: Add a knob to disable setgroups on a per user namespace basis")


+------------------------------------------+------------+------------+
|                                          | f0d62aec93 | bbea5f5532 |
+------------------------------------------+------------+------------+
| boot_successes                           | 24         | 11         |
| boot_failures                            | 1          | 27         |
| BUG:kernel_boot_hang                     | 1          | 8          |
| BUG:unable_to_handle_kernel              | 0          | 19         |
| Oops                                     | 0          | 19         |
| Kernel_panic-not_syncing:Fatal_exception | 0          | 19         |
| backtrace:do_sys_open                    | 0          | 19         |
| backtrace:SyS_open                       | 0          | 19         |
+------------------------------------------+------------+------------+


[    4.182286] init: Failed to create pty - disabling logging for job
[    4.185260] init: Failed to create pty - disabling logging for job
[    4.187855] init: Failed to create pty - disabling logging for job
[   14.400216] BUG: unable to handle kernel NULL pointer dereference at           (null)
[   14.401009] IP: [<          (null)>]           (null)
[   14.401009] PGD 15db4067 PUD 15852067 PMD 0 
[   14.401009] Oops: 0010 [#1] SMP 
[   14.401009] Modules linked in:
[   14.401009] CPU: 1 PID: 311 Comm: trinity-main Not tainted 3.18.0-00702-g696484a #3
[   14.401009] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   14.401009] task: ffff88001581d8b0 ti: ffff8800158c0000 task.ti: ffff8800158c0000
[   14.401009] RIP: 0010:[<0000000000000000>]  [<          (null)>]           (null)
[   14.401009] RSP: 0018:ffff8800158c3d80  EFLAGS: 00010246
[   14.401009] RAX: ffffffff818ebc00 RBX: ffff8800158c3e38 RCX: ffff880014b44f00
[   14.401009] RDX: 0000000000000000 RSI: ffff8800158c3e38 RDI: ffff880014b44f00
[   14.401009] RBP: ffff8800158c3e28 R08: 0000000000000000 R09: 0000000000000000
[   14.401009] R10: 0000000000000000 R11: ffff880014b44f00 R12: ffff880014cbd800
[   14.401009] R13: ffff8800158c3de8 R14: 0000000000000000 R15: 0000000000000041
[   14.401009] FS:  00007ff618590700(0000) GS:ffff880013700000(0000) knlGS:0000000000000000
[   14.401009] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   14.401009] CR2: 0000000000000000 CR3: 0000000015e83000 CR4: 00000000000006e0
[   14.401009] Stack:
[   14.401009]  ffffffff811f2398 ffff880015e59000 ffff88001581d8b0 ffff88001581d8b0
[   14.401009]  ffff880014b44f00 ffff8800158c3f24 ffff880015e59000 ffff88001581d8b0
[   14.401009]  ffff88001581d8b0 00000000df9a5ea7 0000000000000000 ffff8800132adb60
[   14.401009] Call Trace:
[   14.401009]  [<ffffffff811f2398>] ? path_openat+0x538/0x680
[   14.401009]  [<ffffffff811f449a>] do_filp_open+0x3a/0xb0
[   14.401009]  [<ffffffff81201717>] ? __alloc_fd+0xa7/0x130
[   14.401009]  [<ffffffff811e13bc>] do_sys_open+0x12c/0x220
[   14.401009]  [<ffffffff811e14ce>] SyS_open+0x1e/0x20
[   14.401009]  [<ffffffff8189f829>] system_call_fastpath+0x12/0x17
[   14.401009] Code:  Bad RIP value.
[   14.401009] RIP  [<          (null)>]           (null)
[   14.401009]  RSP <ffff8800158c3d80>
[   14.401009] CR2: 0000000000000000
[   14.428875] ---[ end trace cd2f260044a49852 ]---
[   14.429656] Kernel panic - not syncing: Fatal exception



Thanks,
Fengguang


View attachment "config-3.18.0-rc6-00015-gbbea5f5" of type "text/plain" (126510 bytes)

View attachment ".dmesg" of type "text/plain" (36049 bytes)

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