linux-kernel - [lkp] [nfs] 148558a301: BUG: unable to handle kernel NULL pointer dereference at 0000000000000028

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Date:	Fri, 04 Mar 2016 16:34:12 +0800
From:	kernel test robot <ying.huang@...ux.intel.com>
TO:	Goldwyn Rodrigues <rgoldwyn@...e.com>
CC:	0day robot <fengguang.wu@...el.com>
Subject: [lkp] [nfs] 148558a301: BUG: unable to handle kernel NULL pointer
 dereference at 0000000000000028

FYI, we noticed the below changes on

https://github.com/0day-ci/linux Goldwyn-Rodrigues/ovl-Add-d_select_inode-to-reval-dentry-operations/20160302-021629
commit 148558a301d260972086b6c321d6341d3740cccf ("nfs: Store and use inode in nfs_open_context")


+------------------------------------------+------------+------------+
|                                          | dc366564ea | 148558a301 |
+------------------------------------------+------------+------------+
| boot_successes                           | 16         | 20         |
| boot_failures                            | 1          | 11         |
| invoked_oom-killer:gfp_mask=0x           | 1          |            |
| Mem-Info                                 | 1          |            |
| Out_of_memory:Kill_process               | 1          |            |
| backtrace:_do_fork                       | 1          |            |
| backtrace:SyS_clone                      | 1          |            |
| backtrace:do_execveat_common             | 1          |            |
| backtrace:compat_SyS_execve              | 1          |            |
| BUG:unable_to_handle_kernel              | 0          | 11         |
| Oops                                     | 0          | 11         |
| RIP:alloc_nfs_open_context               | 0          | 11         |
| Kernel_panic-not_syncing:Fatal_exception | 0          | 11         |
| backtrace:do_sys_open                    | 0          | 11         |
| backtrace:SyS_open                       | 0          | 11         |
+------------------------------------------+------------+------------+



[   13.554531] NFS: Registering the id_resolver key type
[   13.555827] Key type id_resolver registered
[   13.556857] Key type id_legacy registered
[   13.835351] BUG: unable to handle kernel NULL pointer dereference at 0000000000000028
[   13.836041] IP: [<ffffffff812e3f31>] alloc_nfs_open_context+0x51/0x100
[   13.836041] PGD 0 
[   13.836041] Oops: 0000 [#1] SMP 
[   13.836041] Modules linked in: rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver sg sr_mod cdrom ata_generic pata_acpi ppdev snd_pcm snd_timer snd soundcore serio_raw pcspkr parport_pc parport floppy ata_piix acpi_cpufreq libata i2c_piix4
[   13.844812] CPU: 0 PID: 343 Comm: wrapper Not tainted 4.5.0-rc6-00003-g148558a #1
[   13.854820] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[   13.854820] task: ffff88003f870000 ti: ffff88003f420000 task.ti: ffff88003f420000
[   13.854820] RIP: 0010:[<ffffffff812e3f31>]  [<ffffffff812e3f31>] alloc_nfs_open_context+0x51/0x100
[   13.865228] RSP: 0018:ffff88003f423c38  EFLAGS: 00010282
[   13.867037] RAX: ffff88003f4f4840 RBX: ffff88003f4f4840 RCX: 0000000000001c3c
[   13.867037] RDX: 0000000000001c3b RSI: 0000000000000509 RDI: ffffffff81bea1b4
[   13.867037] RBP: ffff88003f423c60 R08: 000000000001a660 R09: ffff880035801800
[   13.867037] R10: ffff88003f4f4840 R11: 0000000000008241 R12: ffff88003f1926c0
[   13.867037] R13: ffff88003f4f4780 R14: 0000000000000000 R15: 0000000000000002
[   13.867037] FS:  00007f2e1fcba700(0000) GS:ffff880037200000(0000) knlGS:0000000000000000
[   13.867037] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   13.867037] CR2: 0000000000000028 CR3: 000000003f636000 CR4: 00000000000006f0
[   13.867037] Stack:
[   13.867037]  0000000000008241 ffff88003f1926c0 ffff88003f189d48 ffff88003f423c88
[   13.867037]  00000000000081b4 ffff88003f423d00 ffffffff812dee74 ffff88003f423d88
[   13.867037]  ffff88003e813000 ffff88003f1926c0 000081b400008009 0000000000000000
[   13.867037] Call Trace:
[   13.867037]  [<ffffffff812dee74>] nfs_atomic_open+0x124/0x3f0
[   13.867037]  [<ffffffff81202c38>] path_openat+0x8f8/0x1360
[   13.867037]  [<ffffffff8120471e>] do_filp_open+0x7e/0xe0
[   13.867037]  [<ffffffff81203876>] ? getname_flags+0x56/0x1f0
[   13.867037]  [<ffffffff811d0d65>] ? kmem_cache_alloc+0x1a5/0x200
[   13.867037]  [<ffffffff81212366>] ? __alloc_fd+0x46/0x180
[   13.867037]  [<ffffffff811f2de6>] do_sys_open+0x116/0x1f0
[   13.867037]  [<ffffffff811f2ede>] SyS_open+0x1e/0x20
[   13.867037]  [<ffffffff818e4eee>] entry_SYSCALL_64_fastpath+0x12/0x6d
[   13.867037] Code: 49 89 c5 0f 87 b5 00 00 00 48 8b 3d 3a 2a f3 00 ba 88 00 00 00 be c0 00 40 02 e8 9b ce ee ff 48 85 c0 48 89 c3 0f 84 9e 00 00 00 <49> 8b 7e 28 e8 06 4e 00 00 4d 85 e4 74 0a 49 8d 7c 24 58 e8 87 
[   13.867037] RIP  [<ffffffff812e3f31>] alloc_nfs_open_context+0x51/0x100
[   13.867037]  RSP <ffff88003f423c38>
[   13.867037] CR2: 0000000000000028
[   13.936306] ---[ end trace 497d6290b4a58a55 ]---
[   13.938047] Kernel panic - not syncing: Fatal exception





Thanks,
Kernel Test Robot

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