linux-kernel - [cgroup] BUG: unable to handle kernel NULL pointer dereference at 0000001c

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Date:	Wed, 19 Feb 2014 20:25:37 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [cgroup] BUG: unable to handle kernel NULL pointer dereference at
 0000001c

Greetings,

I got the below dmesg and the first bad commit is

git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git for-next

commit ace2bee8135a3dc725958b8d08c55ee9df813d39
Author:     Tejun Heo <tj@...nel.org>
AuthorDate: Tue Feb 11 11:52:47 2014 -0500
Commit:     Tejun Heo <tj@...nel.org>
CommitDate: Tue Feb 11 11:52:47 2014 -0500

    cgroup: introduce cgroup_tree_mutex
    
    Signed-off-by: Tejun Heo <tj@...nel.org>
    Acked-by: Li Zefan <lizefan@...wei.com>

[   97.464167] BUG: unable to handle kernel NULL pointer dereference at 0000001c
[   97.464897] IP: [<8130f33d>] kernfs_path_locked+0x7d/0xc0
[   97.465519] *pde = 00000000
[   97.465960] Oops: 0000 [#1] SMP
[   97.466936] CPU: 0 PID: 24 Comm: kworker/0:1 Tainted: G S      W    3.14.0-rc2-01592-g97162c1 #6
[   97.467818] Workqueue: events_freezable_power_ disk_events_workfn
[   97.468342] task: 801c7560 ti: 801d6000 task.ti: 801d6000
[   97.468836] EIP: 0060:[<8130f33d>] EFLAGS: 00000046 CPU: 0
[   97.469291] EIP is at kernfs_path_locked+0x7d/0xc0
[   97.469636] EAX: 00000000 EBX: 00000000 ECX: 801d7c34 EDX: 801d7bb4
[   97.470024] ESI: 00000046 EDI: 801d7c33 EBP: 801d7b68 ESP: 801d7b58
[   97.470505]  DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
[   97.470929] CR0: 8005003b CR2: 0000001c CR3: 03b92000 CR4: 00300690
[   97.471550] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[   97.472155] DR6: 00000000 DR7: 00000000
[   97.472397] Stack:
[   97.472397]  801d7bb4 00000000 00000046 801d7bb4 801d7b80 8130fe59 00000080 929c0ce0
[   97.472397]  929ae498 00000018 801d7c40 8199b88a 00000002 00000001 00000000 8199b650
[   97.472397]  929ae498 00000000 00000001 801c7560 929ae5e4 929b46f8 929c0ca0 819978d0
[   97.472397] Call Trace:
[   97.472397]  [<8130fe59>] kernfs_path+0x49/0x80
[   97.472397]  [<8199b88a>] cfq_find_alloc_queue+0x3fa/0x620
[   97.472397]  [<8199b650>] ? cfq_find_alloc_queue+0x1c0/0x620
[   97.472397]  [<819978d0>] ? cfq_put_request+0x220/0x220
[   97.472397]  [<8199bca5>] ? cfq_set_request+0x85/0x740
[   97.472397]  [<8111e5ce>] ? do_raw_spin_lock+0xe/0x2e0
[   97.472397]  [<8199bb35>] cfq_get_queue+0x85/0x170
[   97.472397]  [<8199bff7>] cfq_set_request+0x3d7/0x740

git bisect start 97162c1b407ab8dbcc637c316b772dd0572deddc b28a960c42fcd9cfc987441fa6d1c1a471f0f9ed --
git bisect good fac377044fb04ec759db1dd84fab3312b718541a  # 12:52     20+      2  Merge 'asoc/topic/io' into devel-hourly-2014021619
git bisect good e4a1d2bc3960c559a130db3ca999521c8120fbfb  # 13:00     20+      1  Merge 'lunn/v3.14-rc1-synology-v2' into devel-hourly-2014021619
git bisect  bad df2a05d9d2e5ec7aaa7f2912bf531955525f6155  # 13:02      0-      7  Merge 'cgroup/review-post-kernfs-conversion' into devel-hourly-2014021619
git bisect good 542b836903f8aa533efc48c0d4b269303f14885e  # 13:06     20+      7  Merge 'input/for-linus' into devel-hourly-2014021619
git bisect good 3a24395f59305e7995690e65e5593082ae8d9c1b  # 13:09     20+      5  Merge 'target/master' into devel-hourly-2014021619
git bisect  bad ace2bee8135a3dc725958b8d08c55ee9df813d39  # 13:13      1-      2  cgroup: introduce cgroup_tree_mutex
git bisect good 0ab02ca8f887908152d1a96db5130fc661d36a1e  # 13:19     25+      7  cgroup: protect modifications to cgroup_idr with cgroup_mutex
git bisect good 69e943b7d3c2dcca1087e03e556ac6cb0d4433b4  # 13:23     25+      8  cgroup: update locking in cgroup_show_options()
git bisect good f7cef064aa01a1ac682c1945cc168b878cb118ff  # 13:30     25+      9  Merge branch 'driver-core-next' into cgroup/for-3.15
git bisect good 5a17f543ed6808e9085063277fe46795dea484bd  # 13:35     25+     11  cgroup: improve css_from_dir() into css_tryget_from_dir()
# first bad commit: [ace2bee8135a3dc725958b8d08c55ee9df813d39] cgroup: introduce cgroup_tree_mutex
git bisect good 5a17f543ed6808e9085063277fe46795dea484bd  # 13:39     75+     20  cgroup: improve css_from_dir() into css_tryget_from_dir()
git bisect  bad 97162c1b407ab8dbcc637c316b772dd0572deddc  # 13:39      0-     19  0day head guard for 'devel-hourly-2014021619'
git bisect good 6d0abeca3242a88cab8232e4acd7e2bf088f3bc2  # 13:48     75+     15  Linux 3.14-rc3

Thanks,
Fengguang

View attachment "dmesg-quantal-waimea-7:20140217000627:i386-randconfig-nh0-02162347:3.14.0-rc2-01592-g97162c1:6" of type "text/plain" (52609 bytes)

Download attachment "i386-randconfig-nh0-02162347-97162c1b407ab8dbcc637c316b772dd0572deddc-WARNING:----at----smp_call_function_single+-x-37158.log" of type "application/octet-stream" (26086 bytes)

View attachment "config-3.14.0-rc2-01592-g97162c1" of type "text/plain" (91349 bytes)

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