linux-kernel - [lkp] [mtd] e0460264db: BUG: unable to handle kernel NULL pointer dereference at 000005c4

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Date:	Tue, 15 Dec 2015 08:55:16 +0800
From:	kernel test robot <ying.huang@...ux.intel.com>
TO:	Boris Brezillon <boris.brezillon@...e-electrons.com>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: [lkp] [mtd] e0460264db: BUG: unable to handle kernel NULL pointer
 dereference at 000005c4

FYI, we noticed the below changes on

https://github.com/bbrezillon/linux-0day nand/ecclayout-squashed
commit e0460264db239f81a05a0f116efc84b9c650e0df ("mtd: use mtd_eccpos() and mtd_oobfree() where appropriate")


+-----------------------------------------------------+------------+------------+
|                                                     | eb02008ffd | e0460264db |
+-----------------------------------------------------+------------+------------+
| boot_successes                                      | 0          | 0          |
| boot_failures                                       | 12         | 12         |
| BUG:scheduling_while_atomic                         | 12         |            |
| WARNING:at_kernel/sched/core.c:#preempt_count_sub() | 12         |            |
| INFO:lockdep_is_turned_off                          | 12         |            |
| backtrace:lcd_write_cmd_p8                          | 12         |            |
| backtrace:lcd_init_display                          | 12         |            |
| backtrace:__parport_register_driver                 | 12         |            |
| backtrace:panel_init_module                         | 12         |            |
| backtrace:kernel_init_freeable                      | 12         | 12         |
| backtrace:lcd_clear_display                         | 12         |            |
| BUG:unable_to_handle_kernel                         | 0          | 12         |
| Oops                                                | 0          | 12         |
| EIP_is_at_nand_transfer_oob                         | 0          | 12         |
| Kernel_panic-not_syncing:Fatal_exception            | 0          | 12         |
| backtrace:nand_default_bbt                          | 0          | 12         |
| backtrace:ns_init_module                            | 0          | 12         |
+-----------------------------------------------------+------------+------------+



[    6.803737] sector address bytes: 3
[    6.804161] options: 0x42
[    6.805299] Scanning device for bad blocks
[    6.808905] BUG: unable to handle kernel NULL pointer dereference at 000005c4
[    6.809844] IP: [<7e09a74d>] nand_transfer_oob+0x3d/0x160
[    6.810593] *pde = 00000000 
[    6.811006] Oops: 0000 [#1] PREEMPT 
[    6.811477] CPU: 0 PID: 1 Comm: swapper Not tainted 4.4.0-rc1-00168-ge046026 #1
[    6.812363] task: 7802ecc0 ti: 78030000 task.ti: 78030000
[    6.813032] EIP: 0060:[<7e09a74d>] EFLAGS: 00010297 CPU: 0
[    6.813684] EIP is at nand_transfer_oob+0x3d/0x160
[    6.814361] EAX: 00000000 EBX: 78031e7c ECX: 00000010 EDX: 00000000
[    6.815118] ESI: 8131ac2c EDI: 00000010 EBP: 78031dec ESP: 78031dc8
[    6.826907]  DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068
[    6.827558] CR0: 8005003b CR2: 000005c4 CR3: 0698b000 CR4: 00000690
[    6.828317] Stack:
[    6.828566]  8130d000 00000000 00000010 8131ac2c 8130d000 00000010 78031e7c 8130d000
[    6.829633]  00000010 78031e38 7e09b6c3 78031e90 00000010 00000000 00000000 00000010
[    6.830687]  00000000 78031e90 00000000 8131ac2c 00000000 00000010 00000000 00000000
[    6.835827] Call Trace:
[    6.836139]  [<7e09b6c3>] nand_read_oob+0x223/0x320
[    6.836730]  [<7e09b4a0>] ? nand_do_read_ops+0x4f0/0x4f0
[    6.837391]  [<7e077f83>] mtd_read_oob+0x23/0x60
[    6.841249]  [<7e09dcd8>] create_bbt+0x118/0x250
[    6.841812]  [<7e09f7a1>] nand_default_bbt+0x641/0x720
[    6.842446]  [<7dafe16e>] ? __kmalloc+0xbe/0x1e0
[    6.843021]  [<7e93f947>] ns_init_module+0xc8f/0xd6f
[    6.843609]  [<7e910b3a>] ? do_one_initcall+0x79/0x14c
[    6.844238]  [<7e93ecb8>] ? init_nanddoc+0xa4/0xa4
[    6.856895]  [<7e910b8f>] do_one_initcall+0xce/0x14c
[    6.857502]  [<7e9104b3>] ? initcall_blacklist+0x7c/0x7c
[    6.858150]  [<7da5886a>] ? parse_args+0x26a/0x3f0
[    6.858718]  [<7e910cc1>] ? kernel_init_freeable+0xb4/0x151
[    6.859408]  [<7e910ce1>] kernel_init_freeable+0xd4/0x151
[    6.860069]  [<7e485f68>] kernel_init+0x8/0xc0
[    6.860599]  [<7e48ea48>] ret_from_kernel_thread+0x20/0x34
[    6.871322]  [<7e485f60>] ? rest_init+0x110/0x110
[    6.871893] Code: 83 f9 01 89 55 e8 8b 7d 0c 89 45 e0 74 40 72 0e 83 f9 02 74 09 0f 0b 8d b4 26 00 00 00 00 8b 45 08 8b 75 e8 89 f9 8b 10 8b 45 e0 <03> 90 c4 05 00 00 89 f0 e8 66 de db ff 83 c4 18 89 f0 5b 01 f8
[    6.875193] EIP: [<7e09a74d>] nand_transfer_oob+0x3d/0x160 SS:ESP 0068:78031dc8
[    6.876180] CR2: 00000000000005c4
[    6.876607] ---[ end trace 6b773ed9ac0183e7 ]---
[    6.877173] Kernel panic - not syncing: Fatal exception



Thanks,
Ying Huang

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