Free swap  = 0kB
Total swap = 0kB
1965969 pages RAM
0 pages HighMem/MovableOnly
321064 pages reserved
INFO: task loop5:7825 blocked for more than 120 seconds.
      Not tainted 4.9.106-g8b94b87 #46
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
loop5           D26952  7825      2 0x00000000
 ffff880191bee000 0000000000000000 ffff8801a32f4a80 ffffffff84629800
 ffff8801db221c18 ffff8801d518edf0 ffffffff839e8c0d 0000000041b58ab3
 ffffffff843c21d0 ffffffff812366a0 0000000000000000 ffff8801db2224e8
Call Trace:
 [<ffffffff839ea20f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839f6621>] schedule_timeout+0x861/0xf70 kernel/time/timer.c:1768
 [<ffffffff839e83ea>] io_schedule_timeout+0x1ba/0x390 kernel/sched/core.c:5180
 [<ffffffff81e522ec>] io_schedule include/linux/sched.h:460 [inline]
 [<ffffffff81e522ec>] bt_get.isra.8+0x27c/0x780 block/blk-mq-tag.c:141
 [<ffffffff81e531fc>] __blk_mq_get_tag block/blk-mq-tag.c:163 [inline]
 [<ffffffff81e531fc>] blk_mq_get_tag+0xac/0x220 block/blk-mq-tag.c:192
 [<ffffffff81e4292a>] __blk_mq_alloc_request+0x2a/0xaa0 block/blk-mq.c:196
 [<ffffffff81e44d2b>] blk_mq_map_request.isra.38+0x3ab/0x900 block/blk-mq.c:1207
 [<ffffffff81e4d176>] blk_sq_make_request+0x1d6/0x1220 block/blk-mq.c:1374
 [<ffffffff81e200ae>] generic_make_request+0x20e/0x9b0 block/blk-core.c:2055
 [<ffffffff81e20900>] submit_bio+0xb0/0x460 block/blk-core.c:2126
 [<ffffffff81643d1a>] dio_bio_submit fs/direct-io.c:420 [inline]
 [<ffffffff81643d1a>] do_blockdev_direct_IO+0x35da/0x5a80 fs/direct-io.c:1301
 [<ffffffff81646265>] __blockdev_direct_IO+0xa5/0xd0 fs/direct-io.c:1360
 [<ffffffff8162fe10>] blkdev_direct_IO+0xa0/0xd0 fs/block_dev.c:183
 [<ffffffff8143ebd0>] generic_file_read_iter+0x660/0x1a90 mm/filemap.c:1951
 [<ffffffff81632a15>] blkdev_read_iter+0x105/0x170 fs/block_dev.c:1738
 [<ffffffff825ce263>] lo_rw_aio+0x6b3/0x8a0 drivers/block/loop.c:506
 [<ffffffff825ce827>] do_req_filebacked drivers/block/loop.c:543 [inline]
 [<ffffffff825ce827>] loop_handle_cmd drivers/block/loop.c:1698 [inline]
 [<ffffffff825ce827>] loop_queue_work+0x3d7/0x2320 drivers/block/loop.c:1710
 [<ffffffff8119d429>] kthread_worker_fn+0x249/0x6b0 kernel/kthread.c:627
 [<ffffffff8119d04d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f9cdc>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373

Showing all locks held in the system:
2 locks held by khungtaskd/519:
 #0:  (rcu_read_lock){......}, at: [<ffffffff81366b6c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81366b6c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81426150>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/3769:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f7cb2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff821200c2>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133
2 locks held by syz-executor6/13548:
 #0:  (&sb->s_type->i_mutex_key#14){++++++}, at: [<ffffffff815e1b0c>] inode_lock include/linux/fs.h:766 [inline]
 #0:  (&sb->s_type->i_mutex_key#14){++++++}, at: [<ffffffff815e1b0c>] lock_mount+0x8c/0x2c0 fs/namespace.c:2077
 #1:  (namespace_sem){++++++}, at: [<ffffffff815e1b4a>] namespace_lock fs/namespace.c:1423 [inline]
 #1:  (namespace_sem){++++++}, at: [<ffffffff815e1b4a>] lock_mount+0xca/0x2c0 fs/namespace.c:2082

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.106-g8b94b87 #46
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8ec7d08 ffffffff81eb4209 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810b96a0 ffff8801d8ec7d40
 ffffffff81ebf507 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb4209>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb4209>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebf507>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebf49a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b97a4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81367104>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81367104>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81367104>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81367104>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119d04d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f9cdc>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 13549 Comm: syz-executor6 Not tainted 4.9.106-g8b94b87 #46
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff880190c46000 task.stack: ffff88018d860000
RIP: 0010:[<ffffffff8123762b>] 
c [<ffffffff8123762b>] lookup_chain_cache kernel/locking/lockdep.c:2139 [inline]
RIP: 0010:[<ffffffff8123762b>] 
c [<ffffffff8123762b>] validate_chain kernel/locking/lockdep.c:2236 [inline]
RIP: 0010:[<ffffffff8123762b>] 
c [<ffffffff8123762b>] __lock_acquire+0xf8b/0x4070 kernel/locking/lockdep.c:3345
RSP: 0018:ffff8801db3079c0  EFLAGS: 00000096
RAX: dffffc0000000000 RBX: ffff880190c46968 RCX: 00000000b244fa0c
RDX: 1ffffffff09f9a57 RSI: ffff880190c46968 RDI: ffffffff84fcd2b8
RBP: ffff8801db307b68 R08: ffff880190c46988 R09: 0000000000000000
R10: ffff880190c46000 R11: 1ffff10032188d2c R12: ffffffff84fcd2a8
R13: 0000000000000000 R14: 00000000eeea1bd5 R15: d95ee19846340a52
FS:  0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f574eb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000000811c2d4 CR3: 00000001d0755000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801d9913f60
c 0000000041b58ab3
c ffffffff843bb66f
c ffffffff811fdff0
c
 ffffed0032188d18
c 0000000000001193
c 0000000000000a1c
c 0000000000000a1c
c
 00000000000000b8
c 000000000000024d
c ffffffff8558c640
c 000000000000000e
c
Call Trace:
 [<ffffffff8123b180>] lock_acquire+0x130/0x3e0 kernel/locking/lockdep.c:3756
 [<ffffffff839f9a2e>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:112 [inline]
 [<ffffffff839f9a2e>] _raw_spin_lock_irqsave+0x4e/0x62 kernel/locking/spinlock.c:159
 [<ffffffff812033da>] load_balance+0x6ea/0x2fa0 kernel/sched/fair.c:9504
 [<ffffffff8120817e>] rebalance_domains+0x6be/0xbc0 kernel/sched/fair.c:10114
 [<ffffffff81208979>] run_rebalance_domains+0x2f9/0x510 kernel/sched/fair.c:10332
 [<ffffffff83a006fb>] __do_softirq+0x20b/0x937 kernel/softirq.c:284
 [<ffffffff8114b227>] invoke_softirq kernel/softirq.c:364 [inline]
 [<ffffffff8114b227>] irq_exit+0x147/0x190 kernel/softirq.c:405
 [<ffffffff839ff2e1>] exiting_irq arch/x86/include/asm/apic.h:659 [inline]
 [<ffffffff839ff2e1>] smp_apic_timer_interrupt+0x81/0xa0 arch/x86/kernel/apic/apic.c:960
 [<ffffffff839fb470>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:648
 <EOI> 
d [<ffffffff839f920f>] ? arch_local_irq_restore arch/x86/include/asm/paravirt.h:768 [inline]
 <EOI> 
d [<ffffffff839f920f>] ? __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:162 [inline]
 <EOI> 
d [<ffffffff839f920f>] ? _raw_spin_unlock_irqrestore+0x5f/0x70 kernel/locking/spinlock.c:191
 [<ffffffff814a3a5d>] spin_unlock_irqrestore include/linux/spinlock.h:362 [inline]
 [<ffffffff814a3a5d>] pcpu_alloc+0x2ed/0xad0 mm/percpu.c:987
 [<ffffffff814a4294>] __alloc_percpu+0x24/0x30 mm/percpu.c:1079
 [<ffffffff815dca2a>] alloc_vfsmnt+0x12a/0x7f0 fs/namespace.c:221
 [<ffffffff815de4d4>] clone_mnt+0x74/0xb40 fs/namespace.c:1031
 [<ffffffff815e33af>] copy_tree+0x32f/0x810 fs/namespace.c:1793
 [<ffffffff8160f904>] propagate_one+0x434/0x7e0 fs/pnode.c:267
 [<ffffffff81610bfa>] propagate_mnt+0x18a/0x3d0 fs/pnode.c:317
 [<ffffffff815e42bd>] attach_recursive_mnt+0x4ed/0x8f0 fs/namespace.c:2022
 [<ffffffff815e482f>] graft_tree+0x16f/0x1f0 fs/namespace.c:2122
 [<ffffffff815e71ef>] do_loopback fs/namespace.c:2243 [inline]
 [<ffffffff815e71ef>] do_mount+0x1f5f/0x2740 fs/namespace.c:2829
 [<ffffffff8168c72c>] C_SYSC_mount fs/compat.c:810 [inline]
 [<ffffffff8168c72c>] compat_SyS_mount+0x4fc/0xff0 fs/compat.c:775
 [<ffffffff81006da7>] do_syscall_32_irqs_on arch/x86/entry/common.c:325 [inline]
 [<ffffffff81006da7>] do_fast_syscall_32+0x2f7/0x870 arch/x86/entry/common.c:387
 [<ffffffff839fb210>] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137
Code: 
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c