linux-kernel - [cgroup] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080

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Date:	Fri, 7 Feb 2014 10:33:33 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	cgroups@...r.kernel.org,
	Linux Memory Management List <linux-mm@...ck.org>,
	linux-kernel@...r.kernel.org
Subject: [cgroup] BUG: unable to handle kernel NULL pointer dereference at
 0000000000000080

Tejun,

Here is another bisect.

The first bad commit could be any of:
5a87728c4502d0a99f53346545605360fce1e91e cgroup: factor out cgroup_setup_root() from cgroup_mount()
6a9fc7f859a24754999ff9096015583b70dfa162 cgroup: update cgroup name handling
bb7a2fa01329b0afc2307011d634c4bde5ef10f1 cgroup: restructure locking and error handling in cgroup_mount()
0571b870aa584093000cc9a2925db1463813212f cgroup: make cgroup_subsys->base_cftypes use cgroup_add_cftypes()
4e6a3a2aae35039751d88a567a0346660f01a1a1 cgroup: release cgroup_mutex over file removals
43b48e8041f0bfaf295e796d9157b40dfac798f0 cgroup: update the meaning of cftype->max_write_len
9c92986924852946840aa265c66325790e926a36 cgroup: introduce cgroup_tree_mutex
0be500347039f5ef658fd3045ca42afa72583e2d cgroup: improve css_from_dir() into css_tryget_from_dir()
ed6d28fc60daadf1f445ab439e4da86fd363f2bb cgroup: introduce cgroup_init/exit_cftypes()
80f9567b80a645d67f332bc6707ac4d859f05e19 Merge branch 'review-kernfs-cgroup-prep' into review-kernfs-conversion
c48b4c28016fdf927148616940279291d028cbc2 cgroup: introduce cgroup_ino()
455447a2486bc982c7aae2bb0cf93c810da5faae cgroup: misc preps for kernfs conversion
7bac9560a270d2fca5b65893851aa29676db2f4e kernfs: add CONFIG_KERNFS
8d4bee55479f18cbbcbdd3a1c9a3331b90932f05 cgroup: relocate functions in preparation of kernfs conversion
ad1521d8543336ac7acf14f918f467ec27e765b9 kernfs: implement kernfs_get_parent(), kernfs_name/path() and friends
7c87a9de3197667e64401fdba77cb641b93d9d90 cgroup: convert to kernfs
We cannot bisect more!

+------------------------------------------------------------+----+
|                                                            |    |
+------------------------------------------------------------+----+
| boot_successes                                             | 0  |
| boot_failures                                              | 19 |
| BUG:unable_to_handle_kernel_NULL_pointer_dereference_at    | 19 |
| Oops:SMP_DEBUG_PAGEALLOC                                   | 19 |
| RIP:kobject_add_internal                                   | 19 |
| WARNING:CPU:PID:at_kernel/smp.c:smp_call_function_single() | 19 |
| Kernel_panic-not_syncing:Attempted_to_kill_init_exitcode=  | 19 |
| backtrace:__class_register                                 | 10 |
| backtrace:netdev_kobject_init                              | 10 |
| backtrace:net_dev_init                                     | 10 |
| backtrace:kernel_init_freeable                             | 10 |
+------------------------------------------------------------+----+

[    0.413902] PCI: pci_cache_line_size set to 64 bytes
[    0.415027] e820: reserve RAM buffer [mem 0x0009fc00-0x0009ffff]
[    0.416023] e820: reserve RAM buffer [mem 0x0fffe000-0x0fffffff]
[    0.417267] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
[    0.418531] IP: [<ffffffff81437700>] kobject_add_internal+0x720/0x940
[    0.419632] PGD 0 
[    0.419998] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
[    0.420000] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.14.0-rc1-wl-ath-00981-g4f030e0 #2
[    0.420000] task: ffff88000035c010 ti: ffff88000035e000 task.ti: ffff88000035e000
[    0.420000] RIP: 0010:[<ffffffff81437700>]  [<ffffffff81437700>] kobject_add_internal+0x720/0x940
[    0.420000] RSP: 0000:ffff88000035fdb8  EFLAGS: 00010202
[    0.420000] RAX: 0000000000000001 RBX: ffff88000dc6ec48 RCX: 0000000000000001
[    0.420000] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff82df90f8
[    0.420000] RBP: ffff88000035fde8 R08: 0000000000000001 R09: 0000000000000000
[    0.420000] R10: ffffffff81436fa0 R11: ffffffff826015a1 R12: 0000000000000000
[    0.420000] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[    0.420000] FS:  0000000000000000(0000) GS:ffff88000f800000(0000) knlGS:0000000000000000
[    0.420000] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[    0.420000] CR2: 0000000000000080 CR3: 000000000280b000 CR4: 00000000000006f0
[    0.420000] Stack:
[    0.420000]  ffffffff8117d402 ffff88000dc6ec48 ffff88000dc6ec00 ffffffff83c0fae8
[    0.420000]  0000000000000000 0000000000000000 ffff88000035fe08 ffffffff81437958
[    0.420000]  ffffffff82d0dec0 ffff88000dc6ec00 ffff88000035fe38 ffffffff8190473f
[    0.420000] Call Trace:
[    0.420000]  [<ffffffff8117d402>] ? __raw_spin_lock_init+0x42/0x70
[    0.420000]  [<ffffffff81437958>] kset_register+0x38/0x80
[    0.420000]  [<ffffffff8190473f>] __class_register+0x1cf/0x390
[    0.420000]  [<ffffffff82ede361>] ? netdev_init+0x9a/0x9a
[    0.420000]  [<ffffffff82edebcc>] netdev_kobject_init+0x31/0x3a
[    0.420000]  [<ffffffff82ede3d8>] net_dev_init+0x77/0x292
[    0.420000]  [<ffffffff82ede361>] ? netdev_init+0x9a/0x9a
[    0.420000]  [<ffffffff82e787c5>] do_one_initcall+0x14f/0x27b
[    0.420000]  [<ffffffff8112d2d7>] ? parameq+0x17/0xc0
[    0.420000]  [<ffffffff8112d695>] ? parse_args+0x315/0x660
[    0.420000]  [<ffffffff82e78c02>] kernel_init_freeable+0x311/0x404
[    0.420000]  [<ffffffff82e77aad>] ? do_early_param+0xd7/0xd7
[    0.420000]  [<ffffffff81fa6b00>] ? rest_init+0x140/0x140
[    0.420000]  [<ffffffff81fa6b16>] kernel_init+0x16/0x1e0
[    0.420000]  [<ffffffff81fd817c>] ret_from_fork+0x7c/0xb0
[    0.420000]  [<ffffffff81fa6b00>] ? rest_init+0x140/0x140
[    0.420000] Code: ff e9 33 fe ff ff b8 fe ff ff ff e9 29 fe ff ff 48 83 05 b3 1c 42 02 01 48 c7 c7 f8 90 df 82 4c 8b 63 30 48 83 05 60 16 42 02 01 <41> 0f b7 84 24 80 00 00 00 83 e0 0f 66 83 e8 01 41 0f 95 c5 31 
[    0.420000] RIP  [<ffffffff81437700>] kobject_add_internal+0x720/0x940
[    0.420000]  RSP <ffff88000035fdb8>
[    0.420000] CR2: 0000000000000080
[    0.420000] ---[ end trace ec833e17e878915c ]---
[    0.420000] swapper/0 (1) used greatest stack depth: 4760 bytes left

git bisect start 4f030e0534a17070336d1d1e12698da355c344b0 38dbfb59d1175ef458d006556061adeaa8751b72 --
git bisect good 59ad03776650d10cf461d6cdf32e3716baa9ffda  # 17:04     20+     20  Merge 'mac80211-next/master' into devel-hourly-2014020518
git bisect  bad bf541a8b7b445952193b3f25f70158804032b3d4  # 17:21      0-      6  Merge 'usb/usb-linus' into devel-hourly-2014020518
git bisect good 5fd14ed3636ec4bccf69003079c64556660cff1c  # 18:02     20+     20  Merge 'stericsson/ux500-devicetree-cleanup' into devel-hourly-2014020518
git bisect good 8a9b207c1dc7eebc51981b036e60d04153e3233f  # 18:29     20+     20  Merge 'arm-perf/cacheflush' into devel-hourly-2014020518
git bisect  bad 16f9c9e4362d02b34cfce98346a0667f6bfb0db1  # 18:59      0-      1  Merge 'asoc/for-next' into devel-hourly-2014020518
git bisect  bad 52cef3770aefaf7b8d39ea53423533e50286a774  # 19:08      0-      8  Merge 'cgroup/review-post-kernfs-conversion' into devel-hourly-2014020518
git bisect good 7911ad279cf6b3311cfbe44ac437f2b9d5c4318a  # 20:41     20+     20  sysfs, driver-core: remove unused {sysfs|device}_schedule_callback_owner()
git bisect good 36b08489bf55244735cd2f85fedd368434982c14  # 21:52     20+     20  kernfs: rename kernfs_dir_ops to kernfs_syscall_ops
git bisect good 9b9fbc2cbda740628f415261e28aed5fecb6f754  # 22:47     20+     20  kernfs: allow nodes to be created in the deactivated state
git bisect  bad 0f23a4ecfbef2a707ddfd9d8359ae5220c8d76c1  # 23:58      0-     20  cgroup: remove cgroup->name
git bisect  bad 044c79a581aa54cd9ba306f74d92fda6621a8ec1  # 00:45      0-      6  cgroup: remove cftype_set
git bisect good 246bc9304252810e16bd02358c3e6928a74c8f62  # 01:51     20+     20  kernfs: implement kernfs_node_from_dentry(), kernfs_root_from_sb() and kernfs_rename()
git bisect  bad 7c87a9de3197667e64401fdba77cb641b93d9d90  # 02:38      0-     20  cgroup: convert to kernfs
git bisect good ef42c58a5b4b8060a3931aab36bf2b4f81b44afc  # 04:10     20+     20  Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect good 0cc2aa51be9d2f2b001c0e070b2e5cdde89b39f4  # 04:37     20+     20  Add linux-next specific files for 20140206

Thanks,
Fengguang

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