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Date: Tue, 05 Jan 2016 08:46:31 +0800
From: kernel test robot <ying.huang@...ux.intel.com>
TO: Aditya Kali <adityakali@...gle.com>
CC: Serge Hallyn <serge.hallyn@...ntu.com>
Subject: [lkp] [cgroup] 2f37bb12d3: INFO: suspicious RCU usage. ]
FYI, we noticed the below changes on
https://git.kernel.org/pub/scm/linux/kernel/git/sergeh/linux-security 2016-01-04/cgroupns
commit 2f37bb12d30f69cd692933c4646dee73fc58eb43 ("cgroup: introduce cgroup namespaces")
+-----------------------------------------------------------------------------+------------+------------+
| | f2a74e2f95 | 2f37bb12d3 |
+-----------------------------------------------------------------------------+------------+------------+
| boot_successes | 10 | 0 |
| boot_failures | 0 | 4 |
| INFO:suspicious_RCU_usage | 0 | 4 |
| BUG:sleeping_function_called_from_invalid_context_at_kernel/locking/mutex.c | 0 | 4 |
| INFO:lockdep_is_turned_off | 0 | 4 |
| WARNING:at_kernel/softirq.c:#__local_bh_enable_ip() | 0 | 4 |
| backtrace:do_mount | 0 | 4 |
| backtrace:SyS_mount | 0 | 4 |
+-----------------------------------------------------------------------------+------------+------------+
[ 24.723231] Freeing unused kernel memory: 3412K (ffffffff823d1000 - ffffffff82726000)
[ 29.889139]
[ 29.890258] ===============================
[ 29.894865] [ INFO: suspicious RCU usage. ]
[ 29.896444] 4.4.0-rc1-00024-g2f37bb1 #1 Not tainted
[ 29.903005] -------------------------------
[ 29.904342] include/linux/rcupdate.h:560 Illegal context switch in RCU read-side critical section!
[ 29.913573]
[ 29.913573] other info that might help us debug this:
[ 29.913573]
[ 29.929253]
[ 29.929253] rcu_scheduler_active = 1, debug_locks = 0
[ 29.931806] 5 locks held by mount/2358:
[ 29.939337] #0: (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff812042cb>] __blkdev_get+0xa3/0x3dc
[ 29.942861] #1: (floppy_mutex){+.+.+.}, at: [<ffffffff816f1afa>] floppy_open+0x38/0x315
[ 29.946213] #2: (open_lock){+.+.+.}, at: [<ffffffff816f1b08>] floppy_open+0x46/0x315
[ 29.967575] #3: (floppy_lock){......}, at: [<ffffffff814ffc70>] cfq_set_request+0x5c/0x31e
[ 29.970999] #4: (rcu_read_lock){......}, at: [<ffffffff814ff57a>] cfq_get_queue+0x5/0x480
[ 29.992419]
[ 29.992419] stack backtrace:
[ 29.994609] CPU: 0 PID: 2358 Comm: mount Not tainted 4.4.0-rc1-00024-g2f37bb1 #1
[ 30.015336] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[ 30.018272] 0000000000000000 ffff88000b4c3670 ffffffff81505649 ffff88000ba90000
[ 30.021369] ffff88000b4c36a0 ffffffff810d85d6 ffffffff82079d47 0000000000000269
[ 30.076584] 0000000000000000 0000000000000000 ffff88000b4c36c8 ffffffff810b83de
[ 30.079859] Call Trace:
[ 30.102171] [<ffffffff81505649>] dump_stack+0x4b/0x63
[ 30.103881] [<ffffffff810d85d6>] lockdep_rcu_suspicious+0xf7/0x100
[ 30.105797] [<ffffffff810b83de>] ___might_sleep+0x58/0x200
[ 30.107581] [<ffffffff810b85fb>] __might_sleep+0x75/0x7c
[ 30.109284] [<ffffffff81c24fb1>] mutex_lock_nested+0x3e/0x35f
[ 30.111037] [<ffffffff810d7415>] ? __lock_is_held+0x3c/0x57
[ 30.130858] [<ffffffff814ff827>] ? cfq_get_queue+0x2b2/0x480
[ 30.132710] [<ffffffff81124658>] cgroup_path_ns+0x2c/0x72
[ 30.134475] [<ffffffff81124658>] ? cgroup_path_ns+0x2c/0x72
[ 30.136232] [<ffffffff811246b3>] cgroup_path+0x15/0x17
[ 30.150820] [<ffffffff814ff8dd>] cfq_get_queue+0x368/0x480
[ 30.152607] [<ffffffff810dc60e>] ? lock_acquire+0x113/0x1a1
[ 30.154395] [<ffffffff814ffc70>] ? cfq_set_request+0x5c/0x31e
[ 30.156149] [<ffffffff814ffc70>] ? cfq_set_request+0x5c/0x31e
[ 30.157899] [<ffffffff814ffd48>] cfq_set_request+0x134/0x31e
[ 30.159750] [<ffffffff810da0f4>] ? mark_held_locks+0x5e/0x74
[ 30.161524] [<ffffffff81c28bde>] ? _raw_spin_unlock_irq+0x2c/0x3d
[ 30.163320] [<ffffffff810da287>] ? trace_hardirqs_on_caller+0x17d/0x199
[ 30.165231] [<ffffffff810da2b0>] ? trace_hardirqs_on+0xd/0xf
[ 30.166978] [<ffffffff81c28bde>] ? _raw_spin_unlock_irq+0x2c/0x3d
[ 30.168768] [<ffffffff814d9336>] elv_set_request+0x1c/0x21
[ 30.170555] [<ffffffff814dd2eb>] get_request+0x516/0x933
[ 30.198310] [<ffffffff810d1374>] ? wake_up_bit+0x2a/0x2a
[ 30.200009] [<ffffffff814e077a>] blk_queue_bio+0x19c/0x3c6
[ 30.201711] [<ffffffff814de8d5>] generic_make_request+0xc0/0x15e
[ 30.203530] [<ffffffff814dea7c>] submit_bio+0x109/0x114
[ 30.205177] [<ffffffff816f1795>] __floppy_read_block_0+0xcb/0x116
[ 30.206959] [<ffffffff810da0f4>] ? mark_held_locks+0x5e/0x74
[ 30.208701] [<ffffffff81c28b9c>] ? _raw_spin_unlock_irqrestore+0x47/0x5d
[ 30.214879] [<ffffffff810da287>] ? trace_hardirqs_on_caller+0x17d/0x199
[ 30.216775] [<ffffffff816f1685>] ? floppy_resume+0x3f/0x3f
[ 30.218558] [<ffffffff816f1935>] floppy_revalidate+0x155/0x18b
[ 30.220221] [<ffffffff812039e7>] check_disk_change+0x52/0x5e
[ 30.221972] [<ffffffff816f1d68>] floppy_open+0x2a6/0x315
[ 30.223641] [<ffffffff8120433d>] __blkdev_get+0x115/0x3dc
[ 30.225392] [<ffffffff812048c0>] ? blkdev_get+0x2bc/0x2fd
[ 30.240248] [<ffffffff812047ca>] blkdev_get+0x1c6/0x2fd
[ 30.241977] [<ffffffff811ed4bf>] ? mntput_no_expire+0xdd/0x34d
[ 30.243742] [<ffffffff811ed75c>] ? mntput+0x2d/0x2f
[ 30.245364] [<ffffffff811d8308>] ? path_put+0x1e/0x21
[ 30.247008] [<ffffffff81204b1f>] blkdev_get_by_path+0x38/0x71
[ 30.260842] [<ffffffff811d230e>] mount_bdev+0x48/0x19f
[ 30.262569] [<ffffffff812811a7>] ? ext4_calculate_overhead+0x2bd/0x2bd
[ 30.264552] [<ffffffff8127da09>] ext4_mount+0x15/0x17
[ 30.266201] [<ffffffff811d2f39>] mount_fs+0x14/0x8c
[ 30.267820] [<ffffffff811ec988>] vfs_kern_mount+0x6c/0x13a
[ 30.281895] [<ffffffff811efb3e>] do_mount+0xa45/0xbcf
[ 30.283599] [<ffffffff8119374c>] ? strndup_user+0x3f/0x8c
[ 30.285307] [<ffffffff811efef3>] SyS_mount+0x75/0xa1
[ 30.286895] [<ffffffff81c294f2>] entry_SYSCALL_64_fastpath+0x12/0x76
[ 30.288636] BUG: sleeping function called from invalid context at kernel/locking/mutex.c:617
[ 30.291763] in_atomic(): 1, irqs_disabled(): 1, pid: 2358, name: mount
[ 30.302833] INFO: lockdep is turned off.
[ 30.304377] irq event stamp: 2146
[ 30.305789] hardirqs last enabled at (2145): [<ffffffff81c28bde>] _raw_spin_unlock_irq+0x2c/0x3d
[ 30.308833] hardirqs last disabled at (2146): [<ffffffff81c28a03>] _raw_spin_lock_irq+0x1b/0x77
[ 30.325015] softirqs last enabled at (2096): [<ffffffff8109828a>] __do_softirq+0x2ce/0x3bc
[ 30.328158] softirqs last disabled at (2015): [<ffffffff810985a0>] irq_exit+0x47/0x9b
[ 30.331157] CPU: 0 PID: 2358 Comm: mount Not tainted 4.4.0-rc1-00024-g2f37bb1 #1
[ 30.333870] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[ 30.349550] 0000000000000000 ffff88000b4c36a0 ffffffff81505649 ffff88000ba90000
[ 30.352376] ffff88000b4c36c8 ffffffff810b857f ffffffff82079d47 0000000000000269
[ 30.355309] 0000000000000000 ffff88000b4c36f0 ffffffff810b85fb ffffffff8227c4a0
[ 30.358186] Call Trace:
[ 30.359444] [<ffffffff81505649>] dump_stack+0x4b/0x63
[ 30.360947] [<ffffffff810b857f>] ___might_sleep+0x1f9/0x200
[ 30.374649] [<ffffffff810b85fb>] __might_sleep+0x75/0x7c
[ 30.376366] [<ffffffff81c24fb1>] mutex_lock_nested+0x3e/0x35f
[ 30.377975] [<ffffffff810d7415>] ? __lock_is_held+0x3c/0x57
[ 30.392669] [<ffffffff814ff827>] ? cfq_get_queue+0x2b2/0x480
[ 30.394349] [<ffffffff81124658>] cgroup_path_ns+0x2c/0x72
[ 30.395795] [<ffffffff81124658>] ? cgroup_path_ns+0x2c/0x72
[ 30.397342] [<ffffffff811246b3>] cgroup_path+0x15/0x17
[ 30.399137] [<ffffffff814ff8dd>] cfq_get_queue+0x368/0x480
[ 30.400768] [<ffffffff810dc60e>] ? lock_acquire+0x113/0x1a1
[ 30.402242] [<ffffffff814ffc70>] ? cfq_set_request+0x5c/0x31e
[ 30.412934] [<ffffffff814ffc70>] ? cfq_set_request+0x5c/0x31e
[ 30.414461] [<ffffffff814ffd48>] cfq_set_request+0x134/0x31e
[ 30.416314] [<ffffffff810da0f4>] ? mark_held_locks+0x5e/0x74
[ 30.418029] [<ffffffff81c28bde>] ? _raw_spin_unlock_irq+0x2c/0x3d
[ 30.419557] [<ffffffff810da287>] ? trace_hardirqs_on_caller+0x17d/0x199
[ 30.421169] [<ffffffff810da2b0>] ? trace_hardirqs_on+0xd/0xf
[ 30.433999] [<ffffffff81c28bde>] ? _raw_spin_unlock_irq+0x2c/0x3d
[ 30.435841] [<ffffffff814d9336>] elv_set_request+0x1c/0x21
[ 30.437539] [<ffffffff814dd2eb>] get_request+0x516/0x933
[ 30.439329] [<ffffffff810d1374>] ? wake_up_bit+0x2a/0x2a
[ 30.441085] [<ffffffff814e077a>] blk_queue_bio+0x19c/0x3c6
[ 30.442784] [<ffffffff814de8d5>] generic_make_request+0xc0/0x15e
[ 30.444593] [<ffffffff814dea7c>] submit_bio+0x109/0x114
[ 30.459403] [<ffffffff816f1795>] __floppy_read_block_0+0xcb/0x116
[ 30.461273] [<ffffffff810da0f4>] ? mark_held_locks+0x5e/0x74
[ 30.462849] [<ffffffff81c28b9c>] ? _raw_spin_unlock_irqrestore+0x47/0x5d
[ 30.464706] [<ffffffff810da287>] ? trace_hardirqs_on_caller+0x17d/0x199
[ 30.466616] [<ffffffff816f1685>] ? floppy_resume+0x3f/0x3f
[ 30.468094] [<ffffffff816f1935>] floppy_revalidate+0x155/0x18b
[ 30.469713] [<ffffffff812039e7>] check_disk_change+0x52/0x5e
[ 30.484430] [<ffffffff816f1d68>] floppy_open+0x2a6/0x315
[ 30.486076] [<ffffffff8120433d>] __blkdev_get+0x115/0x3dc
[ 30.487619] [<ffffffff812048c0>] ? blkdev_get+0x2bc/0x2fd
[ 30.489073] [<ffffffff812047ca>] blkdev_get+0x1c6/0x2fd
[ 30.490473] [<ffffffff811ed4bf>] ? mntput_no_expire+0xdd/0x34d
[ 30.492040] [<ffffffff811ed75c>] ? mntput+0x2d/0x2f
[ 30.493508] [<ffffffff811d8308>] ? path_put+0x1e/0x21
[ 30.494967] [<ffffffff81204b1f>] blkdev_get_by_path+0x38/0x71
[ 30.496443] [<ffffffff811d230e>] mount_bdev+0x48/0x19f
[ 30.497838] [<ffffffff812811a7>] ? ext4_calculate_overhead+0x2bd/0x2bd
[ 30.499568] [<ffffffff8127da09>] ext4_mount+0x15/0x17
[ 30.514205] [<ffffffff811d2f39>] mount_fs+0x14/0x8c
[ 30.515769] [<ffffffff811ec988>] vfs_kern_mount+0x6c/0x13a
[ 30.517471] [<ffffffff811efb3e>] do_mount+0xa45/0xbcf
[ 30.519125] [<ffffffff8119374c>] ? strndup_user+0x3f/0x8c
[ 30.520873] [<ffffffff811efef3>] SyS_mount+0x75/0xa1
[ 30.522380] [<ffffffff81c294f2>] entry_SYSCALL_64_fastpath+0x12/0x76
[ 30.523969] ------------[ cut here ]------------
[ 30.525353] WARNING: CPU: 0 PID: 2358 at kernel/softirq.c:150 __local_bh_enable_ip+0x45/0xb4()
[ 30.541542] Modules linked in:
[ 30.542882] CPU: 0 PID: 2358 Comm: mount Not tainted 4.4.0-rc1-00024-g2f37bb1 #1
[ 30.545260] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[ 30.547707] 0000000000000000 ffff88000b4c36e8 ffffffff81505649 0000000000000000
[ 30.550543] ffff88000b4c3720 ffffffff810939e9 ffffffff81098485 0000000000000201
[ 30.553777] ffffffff81124687 ffff88000b4f6000 0000000000000000 ffff88000b4c3730
[ 30.570022] Call Trace:
[ 30.571191] [<ffffffff81505649>] dump_stack+0x4b/0x63
[ 30.572786] [<ffffffff810939e9>] warn_slowpath_common+0x99/0xb2
[ 30.574587] [<ffffffff81098485>] ? __local_bh_enable_ip+0x45/0xb4
[ 30.576425] [<ffffffff81124687>] ? cgroup_path_ns+0x5b/0x72
[ 30.578230] [<ffffffff81093ab5>] warn_slowpath_null+0x1a/0x1c
[ 30.580107] [<ffffffff81098485>] __local_bh_enable_ip+0x45/0xb4
[ 30.595125] [<ffffffff81c28b52>] _raw_spin_unlock_bh+0x35/0x38
[ 30.597009] [<ffffffff81124687>] cgroup_path_ns+0x5b/0x72
[ 30.611039] [<ffffffff811246b3>] cgroup_path+0x15/0x17
[ 30.612817] [<ffffffff814ff8dd>] cfq_get_queue+0x368/0x480
[ 30.614661] [<ffffffff810dc60e>] ? lock_acquire+0x113/0x1a1
[ 30.616302] [<ffffffff814ffc70>] ? cfq_set_request+0x5c/0x31e
[ 30.617786] [<ffffffff814ffc70>] ? cfq_set_request+0x5c/0x31e
[ 30.619521] [<ffffffff814ffd48>] cfq_set_request+0x134/0x31e
[ 30.621283] [<ffffffff810da0f4>] ? mark_held_locks+0x5e/0x74
[ 30.632111] [<ffffffff81c28bde>] ? _raw_spin_unlock_irq+0x2c/0x3d
[ 30.633862] [<ffffffff810da287>] ? trace_hardirqs_on_caller+0x17d/0x199
[ 30.635700] [<ffffffff810da2b0>] ? trace_hardirqs_on+0xd/0xf
[ 30.637368] [<ffffffff81c28bde>] ? _raw_spin_unlock_irq+0x2c/0x3d
[ 30.639112] [<ffffffff814d9336>] elv_set_request+0x1c/0x21
[ 30.640741] [<ffffffff814dd2eb>] get_request+0x516/0x933
[ 30.654149] [<ffffffff810d1374>] ? wake_up_bit+0x2a/0x2a
[ 30.655765] [<ffffffff814e077a>] blk_queue_bio+0x19c/0x3c6
[ 30.657479] [<ffffffff814de8d5>] generic_make_request+0xc0/0x15e
[ 30.659366] [<ffffffff814dea7c>] submit_bio+0x109/0x114
[ 30.661102] [<ffffffff816f1795>] __floppy_read_block_0+0xcb/0x116
[ 30.662903] [<ffffffff810da0f4>] ? mark_held_locks+0x5e/0x74
[ 30.664513] [<ffffffff81c28b9c>] ? _raw_spin_unlock_irqrestore+0x47/0x5d
[ 30.679590] [<ffffffff810da287>] ? trace_hardirqs_on_caller+0x17d/0x199
[ 30.681598] [<ffffffff816f1685>] ? floppy_resume+0x3f/0x3f
[ 30.683253] [<ffffffff816f1935>] floppy_revalidate+0x155/0x18b
[ 30.684989] [<ffffffff812039e7>] check_disk_change+0x52/0x5e
[ 30.686809] [<ffffffff816f1d68>] floppy_open+0x2a6/0x315
[ 30.688465] [<ffffffff8120433d>] __blkdev_get+0x115/0x3dc
[ 30.690014] [<ffffffff812048c0>] ? blkdev_get+0x2bc/0x2fd
[ 30.704620] [<ffffffff812047ca>] blkdev_get+0x1c6/0x2fd
[ 30.706161] [<ffffffff811ed4bf>] ? mntput_no_expire+0xdd/0x34d
[ 30.707903] [<ffffffff811ed75c>] ? mntput+0x2d/0x2f
[ 30.738650] [<ffffffff811d8308>] ? path_put+0x1e/0x21
[ 30.740474] [<ffffffff81204b1f>] blkdev_get_by_path+0x38/0x71
[ 30.742381] [<ffffffff811d230e>] mount_bdev+0x48/0x19f
[ 30.757122] [<ffffffff812811a7>] ? ext4_calculate_overhead+0x2bd/0x2bd
[ 30.759164] [<ffffffff8127da09>] ext4_mount+0x15/0x17
[ 30.760866] [<ffffffff811d2f39>] mount_fs+0x14/0x8c
[ 30.775089] [<ffffffff811ec988>] vfs_kern_mount+0x6c/0x13a
[ 30.776919] [<ffffffff811efb3e>] do_mount+0xa45/0xbcf
[ 30.778657] [<ffffffff8119374c>] ? strndup_user+0x3f/0x8c
[ 30.780462] [<ffffffff811efef3>] SyS_mount+0x75/0xa1
[ 30.782210] [<ffffffff81c294f2>] entry_SYSCALL_64_fastpath+0x12/0x76
[ 30.797259] ---[ end trace 7afed05606c6b402 ]---
[ 30.859656] blk_update_request: I/O error, dev fd0, sector 0
Thanks,
Kernel Test Robot
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