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SubjectRe: [lockdep] BUG: init/1242 still has locks held!
From
On Sun, Mar 3, 2013 at 5:02 AM, Fengguang Wu <fengguang.wu@intel.com> wrote:
> Greetings,
>
> I got the below oops and the first bad commit is
>
> commit 6aa9707099c4b25700940eb3d016f16c4434360d
> Author: Mandeep Singh Baines <msb@chromium.org>
> Date: Wed Feb 27 17:03:18 2013 -0800
>
> lockdep: check that no locks held at freeze time
>
> We shouldn't try_to_freeze if locks are held. Holding a lock can cause a
> deadlock if the lock is later acquired in the suspend or hibernate path
> (e.g. by dpm). Holding a lock can also cause a deadlock in the case of
> cgroup_freezer if a lock is held inside a frozen cgroup that is later
> acquired by a process outside that group.
>
> [akpm@linux-foundation.org: export debug_check_no_locks_held]
> Signed-off-by: Mandeep Singh Baines <msb@chromium.org>
> Cc: Ben Chan <benchan@chromium.org>
> Cc: Oleg Nesterov <oleg@redhat.com>
> Cc: Tejun Heo <tj@kernel.org>
> Cc: Rafael J. Wysocki <rjw@sisk.pl>
> Cc: Ingo Molnar <mingo@redhat.com>
> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
>

Hi,

Thanks for the bug report.

This issue is being discussed here:

http://lkml.org/lkml/2013/3/4/221

Regards,
Mandeep

> [ 71.089828]
> [ 71.090356] =====================================
> [ 71.091041] [ BUG: init/1242 still has locks held! ]
> [ 71.091987] 3.8.0-10734-ga7c1120 #1 Not tainted
> [ 71.093135] -------------------------------------
> [ 71.093884] 1 lock held by init/1242:
> [ 71.094437] #0: (&sig->cred_guard_mutex){+.+.+.}, at: [<ffffffff81123a13>] prepare_bprm_creds+0x2d/0x6b
> [ 71.097355]
> [ 71.097355] stack backtrace:
> [ 71.098125] Pid: 1242, comm: init Not tainted 3.8.0-10734-ga7c1120 #1
> [ 71.099011] Call Trace:
> [ 71.099621] [<ffffffff8108628d>] debug_check_no_locks_held+0x8f/0x93
> [ 71.101004] [<ffffffff818bbb1d>] rpc_wait_bit_killable+0x31/0x9f
> [ 71.101882] [<ffffffff81911a18>] __wait_on_bit+0x48/0x7f
> [ 71.102635] [<ffffffff81089b9b>] ? mark_held_locks+0xbe/0xea
> [ 71.103441] [<ffffffff81911ac1>] out_of_line_wait_on_bit+0x72/0x7d
> [ 71.104755] [<ffffffff818bbaec>] ? rpc_queue_empty+0x31/0x31
> [ 71.105582] [<ffffffff818bcc67>] ? __rpc_execute+0x118/0x2b5
> [ 71.106397] [<ffffffff810585cd>] ? autoremove_wake_function+0x3d/0x3d
> [ 71.107286] [<ffffffff818bcc8b>] __rpc_execute+0x13c/0x2b5
> [ 71.108492] [<ffffffff810581eb>] ? bit_waitqueue+0x1b/0x6e
> [ 71.109331] [<ffffffff81058296>] ? wake_up_bit+0x25/0x2a
> [ 71.110116] [<ffffffff818bceb8>] rpc_execute+0x6b/0x92
> [ 71.110876] [<ffffffff818b61eb>] rpc_run_task+0x78/0x80
> [ 71.111627] [<ffffffff818b6329>] rpc_call_sync+0x88/0x9e
> [ 71.112873] [<ffffffff8124ad18>] nfs3_rpc_wrapper.constprop.9+0x36/0xc1
> [ 71.113814] [<ffffffff8124b016>] nfs3_proc_access+0xb8/0x110
> [ 71.114613] [<ffffffff8123a94f>] nfs_do_access+0x14d/0x1f9
> [ 71.115412] [<ffffffff818be3d0>] ? generic_lookup_cred+0x15/0x17
> [ 71.116702] [<ffffffff8123aabc>] nfs_permission+0xc1/0x12f
> [ 71.117505] [<ffffffff81068b80>] ? local_clock+0x41/0x5a
> [ 71.118304] [<ffffffff81127221>] __inode_permission+0x37/0x71
> [ 71.119125] [<ffffffff811272a0>] inode_permission+0x45/0x47
> [ 71.119976] [<ffffffff81129713>] may_open+0x88/0xeb
> [ 71.121096] [<ffffffff81129f79>] do_last.isra.53+0x803/0x9d6
> [ 71.121990] [<ffffffff8112a458>] path_openat.isra.54+0x30c/0x3ce
> [ 71.122834] [<ffffffff81906809>] ? __slab_alloc.constprop.64+0x37c/0x3a9
> [ 71.123807] [<ffffffff81162b18>] ? bm_status_write+0xef/0xef
> [ 71.127338] [<ffffffff8112a826>] do_filp_open+0x38/0x86
> [ 71.128655] [<ffffffff81115e3d>] ? __kmalloc_track_caller+0xa8/0x184
> [ 71.129620] [<ffffffff8112252f>] ? bprm_change_interp+0x34/0x49
> [ 71.130507] [<ffffffff8112273d>] open_exec+0x3d/0xde
> [ 71.131282] [<ffffffff81162ca3>] load_script+0x18b/0x1c0
> [ 71.132520] [<ffffffff81085206>] ? lock_release_holdtime.part.6+0x91/0x96
> [ 71.133554] [<ffffffff8112227a>] ? search_binary_handler+0xf6/0x332
> [ 71.134485] [<ffffffff81915179>] ? _raw_read_unlock+0x28/0x3b
> [ 71.135362] [<ffffffff81122289>] search_binary_handler+0x105/0x332
> [ 71.136718] [<ffffffff811221ae>] ? search_binary_handler+0x2a/0x332
> [ 71.137653] [<ffffffff81123eee>] do_execve_common.isra.27+0x43c/0x56e
> [ 71.138597] [<ffffffff81123bb6>] ? do_execve_common.isra.27+0x104/0x56e
> [ 71.139563] [<ffffffff81124038>] do_execve+0x18/0x1a
> [ 71.140782] [<ffffffff81124281>] sys_execve+0x3b/0x50
> [ 71.141574] [<ffffffff8191d2c9>] stub_execve+0x69/0xa0
>
> git bisect start a7c1120d2dcc83691bafa034d98f70285757e826 3298a3511f1e73255a8dc023efd909e569eea037 --
> git bisect good 69086a78bdc973ec0b722be790b146e84ba8a8c4 # 30 2013-03-03 15:03:33 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
> git bisect good d895cb1af15c04c522a25c79cc429076987c089b # 30 2013-03-03 15:32:27 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
> git bisect bad 7307c00f335a4e986586b12334696098d2fc2bcd # 0 2013-03-03 15:36:44 Merge tag 'late-omap' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
> git bisect bad ee89f81252179dcbf6cd65bd48299f5e52292d88 # 0 2013-03-03 15:40:06 Merge branch 'for-3.9/core' of git://git.kernel.dk/linux-block
> git bisect bad b67bfe0d42cac56c512dd5da4b1b347a23f4b70a # 0 2013-03-03 15:43:46 hlist: drop the node parameter from iterators
> git bisect bad 3b069c5d857a5f1b8cb6bb74c70d9446089f5077 # 0 2013-03-03 15:47:16 IB/core: convert to idr_alloc()
> git bisect bad fe88f2ee33731f0934e8fb26f762b6715e43ff6f # 0 2013-03-03 15:50:03 kexec: prevent double free on image allocation failure
> git bisect good 3e05ca20fb570b456bd9841b5ff489d865e8c563 # 30 2013-03-03 16:03:02 hfsplus: add functionality of manipulating by records in attributes tree
> git bisect good e579d2c259be42b6f29458327e5153b22414b031 # 32 2013-03-03 16:17:47 coredump: remove redundant defines for dumpable states
> git bisect bad 80de7f7ae013b1e287059f39eaba2a12219681cf # 0 2013-03-03 16:22:14 seq-file: use SEEK_ macros instead of hardcoded numbers
> git bisect good c2c1b089b44b783bd50fae4bccaa6f367f92e492 # 30 2013-03-03 16:35:16 fs/proc/vmcore.c: put if tests in the top of the while loop to reduce duplication
> git bisect bad 80d26af89a7249aa5475467000322163c60cdd72 # 0 2013-03-03 16:38:48 coredump: use a freezable_schedule for the coredump_finish wait
> git bisect bad 6aa9707099c4b25700940eb3d016f16c4434360d # 0 2013-03-03 16:40:38 lockdep: check that no locks held at freeze time
> git bisect good c2c1b089b44b783bd50fae4bccaa6f367f92e492 # 90 2013-03-03 17:12:12 fs/proc/vmcore.c: put if tests in the top of the while loop to reduce duplication
> git bisect bad a7c1120d2dcc83691bafa034d98f70285757e826 # 0 2013-03-03 17:16:24 Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
> git bisect good 49f1881cedf9d871c4a55e670b9397dd4b84faef # 90 2013-03-03 17:47:58 Revert "lockdep: check that no locks held at freeze time"
> git bisect bad 106edea2fe051df65a1a6231e9ffa2876cc391cc # 0 2013-03-03 17:53:48 Add linux-next specific files for 20130301
>
> Thanks,
> Fengguang


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