linux-kernel - [dgrp_register_proc] BUG: unable to handle kernel NULL pointer dereference at 0000000000000040

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Date:	Tue, 15 Jan 2013 13:10:05 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Bill Pemberton <wfp5p@...ginia.edu>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [dgrp_register_proc] BUG: unable to handle kernel NULL pointer
 dereference at 0000000000000040

7b6d45c211a401a9bdeebfa96f8a4c811bd3eeaf is the first bad commit

commit 7b6d45c211a401a9bdeebfa96f8a4c811bd3eeaf
Author: Bill Pemberton <wfp5p@...ginia.edu>
Date:   Thu Sep 20 16:55:28 2012 -0400

    staging: dgrp: add dgrp to the build

    Kconfig and Makefile changes to add dgrp to the build system.

    Signed-off-by: Bill Pemberton <wfp5p@...ginia.edu>
    Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

[    7.904899] i2c-core: driver [isl29018] registered
[    7.906424] i2c-core: driver [tsl2583] registered
[    7.908289] BUG: unable to handle kernel NULL pointer dereference at 0000000000000040
[    7.909055] IP: [<ffffffff814f5147>] register_proc_table+0xe0/0x26f
[    7.909055] PGD 0 
[    7.909055] Oops: 0000 [#1] SMP 
[    7.909055] CPU 0 
[    7.909055] Pid: 1, comm: swapper/0 Not tainted 3.8.0-rc3-00051-gc83dcb9 #16  
[    7.909055] RIP: 0010:[<ffffffff814f5147>]  [<ffffffff814f5147>] register_proc_table+0xe0/0x26f
[    7.909055] RSP: 0000:ffff88000d0c1e78  EFLAGS: 00010246
[    7.909055] RAX: 0000000000000003 RBX: 0000000000000000 RCX: 0000000000000003
[    7.909055] RDX: 0000000000000002 RSI: 0000000000000000 RDI: ffffffff81989648
[    7.909055] RBP: ffff88000d0c1eb8 R08: 0000000000000000 R09: 0000000000000000
[    7.909055] R10: ffff88000f4fed68 R11: ffff88000f4fecb8 R12: ffffffff81a9f008
[    7.909055] R13: 0000000000000000 R14: ffffffff82b3a710 R15: ffffffff81989644
[    7.909055] FS:  0000000000000000(0000) GS:ffff88000da00000(0000) knlGS:0000000000000000
[    7.909055] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[    7.909055] CR2: 0000000000000040 CR3: 00000000019a4000 CR4: 00000000000006f0
[    7.909055] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    7.927424] tsc: Refined TSC clocksource calibration: 2666.662 MHz

Thanks,
Fengguang

View attachment "dmesg-kvm-bens-3414-2013-01-14-23-08-47-3.8.0-rc3-00051-gc83dcb9-16" of type "text/plain" (45352 bytes)

View attachment "c83dcb9-bisect.log" of type "text/plain" (9103 bytes)

View attachment ".config-bisect" of type "text/plain" (59235 bytes)