INFO: task kworker/u4:4:2340 blocked for more than 140 seconds.
      Not tainted 4.9.135+ #61
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u4:4    D25880  2340      2 0x80000000
Workqueue: writeback wb_workfn (flush-8:0)
 ffff8801d9f597c0 ffff88019e840b00 ffff8801d0b67900 ffff8801ca9017c0
 ffff8801db621018 ffff8801ce45f190 ffffffff827fa982 ffff8801ce45f168
 ffffffff81206ab7 0000000000000000 00ff8801d9f5a068 ffff8801db6218f0
Call Trace:
 [<ffffffff827fbeaf>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff82805c6a>] __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:526 [inline]
 [<ffffffff82805c6a>] rwsem_down_write_failed+0x39a/0x730 kernel/locking/rwsem-xadd.c:555
 [<ffffffff81b69177>] call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
 [<ffffffff82804a9c>] __down_write arch/x86/include/asm/rwsem.h:125 [inline]
 [<ffffffff82804a9c>] down_write+0x5c/0xa0 kernel/locking/rwsem.c:54
 [<ffffffff816c8d63>] ext4_map_blocks+0x6d3/0x16d0 fs/ext4/inode.c:605
 [<ffffffff816d5ee1>] mpage_map_one_extent fs/ext4/inode.c:2387 [inline]
 [<ffffffff816d5ee1>] mpage_map_and_submit_extent fs/ext4/inode.c:2443 [inline]
 [<ffffffff816d5ee1>] ext4_writepages+0x1551/0x2e00 fs/ext4/inode.c:2783
 [<ffffffff81433c8f>] do_writepages+0xef/0x1d0 mm/page-writeback.c:2331
 [<ffffffff8159eaa9>] __writeback_single_inode+0xd9/0x1020 fs/fs-writeback.c:1320
 [<ffffffff8159fe9c>] writeback_sb_inodes+0x4ac/0xe70 fs/fs-writeback.c:1584
 [<ffffffff815a0d0f>] wb_writeback+0x2cf/0xbd0 fs/fs-writeback.c:1760
 [<ffffffff815a401e>] wb_do_writeback fs/fs-writeback.c:1894 [inline]
 [<ffffffff815a401e>] wb_workfn+0x20e/0xe90 fs/fs-writeback.c:1930
 [<ffffffff81130d61>] process_one_work+0x831/0x1530 kernel/workqueue.c:2092
 [<ffffffff81131b36>] worker_thread+0xd6/0x1140 kernel/workqueue.c:2226
 [<ffffffff811428dd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff8280addc>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373

Showing all locks held in the system:
2 locks held by khungtaskd/24:
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131bb4c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131bb4c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.?..}, at: [<ffffffff813fe314>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/2024:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff82808cd2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81d2b032>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
4 locks held by kworker/u4:4/2340:
 #0:  ("writeback"){++++.+}, at: [<ffffffff81130c6c>] process_one_work+0x73c/0x1530 kernel/workqueue.c:2085
 #1:  ((&(&wb->dwork)->work)){+.+.+.}, at: [<ffffffff81130ca4>] process_one_work+0x774/0x1530 kernel/workqueue.c:2089
 #2:  (&sbi->s_journal_flag_rwsem){.+.+.+}, at: [<ffffffff81433c8f>] do_writepages+0xef/0x1d0 mm/page-writeback.c:2331
 #3:  (&ei->i_data_sem){++++..}, at: [<ffffffff816c8d63>] ext4_map_blocks+0x6d3/0x16d0 fs/ext4/inode.c:605
4 locks held by syz-executor5/8451:
 #0:  (&mm->mmap_sem){++++++}, at: [<ffffffff810b2902>] __do_page_fault+0x272/0xa60 arch/x86/mm/fault.c:1335
 #1:  (sb_pagefaults){.+.+..}, at: [<ffffffff816e67b4>] sb_start_pagefault include/linux/fs.h:1602 [inline]
 #1:  (sb_pagefaults){.+.+..}, at: [<ffffffff816e67b4>] ext4_page_mkwrite+0x154/0xfe0 fs/ext4/inode.c:5764
 #2:  (&ei->i_mmap_sem){++++.+}, at: [<ffffffff816e67ee>] ext4_page_mkwrite+0x18e/0xfe0 fs/ext4/inode.c:5767
 #3:  (&type->s_umount_key#32){++++++}, at: [<ffffffff815a1b49>] try_to_writeback_inodes_sb_nr+0x29/0x70 fs/fs-writeback.c:2358
2 locks held by syz-executor1/8496:
 #0:  (sb_writers#4){.+.+.+}, at: [<ffffffff815755df>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#4){.+.+.+}, at: [<ffffffff815755df>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#9){++++++}, at: [<ffffffff81503368>] inode_lock include/linux/fs.h:766 [inline]
 #1:  (&sb->s_type->i_mutex_key#9){++++++}, at: [<ffffffff81503368>] do_truncate2+0x128/0x1f0 fs/open.c:61
2 locks held by syz-executor1/8505:
 #0:  (sb_writers#4){.+.+.+}, at: [<ffffffff815755df>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#4){.+.+.+}, at: [<ffffffff815755df>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#9){++++++}, at: [<ffffffff81503368>] inode_lock include/linux/fs.h:766 [inline]
 #1:  (&sb->s_type->i_mutex_key#9){++++++}, at: [<ffffffff81503368>] do_truncate2+0x128/0x1f0 fs/open.c:61
2 locks held by syz-executor1/8529:
 #0:  (sb_writers#4){.+.+.+}, at: [<ffffffff815012de>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#4){.+.+.+}, at: [<ffffffff815012de>] vfs_fallocate+0x2fe/0x620 fs/open.c:328
 #1:  (&sb->s_type->i_mutex_key#9){++++++}, at: [<ffffffff8178a4bb>] inode_lock include/linux/fs.h:766 [inline]
 #1:  (&sb->s_type->i_mutex_key#9){++++++}, at: [<ffffffff8178a4bb>] ext4_fallocate+0x1eb/0x1e80 fs/ext4/extents.c:4974
3 locks held by syz-executor1/8531:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff8156cc6c>] __fdget_pos+0xac/0xd0 fs/file.c:781
 #1:  (sb_writers#4){.+.+.+}, at: [<ffffffff8150adeb>] file_start_write include/linux/fs.h:2640 [inline]
 #1:  (sb_writers#4){.+.+.+}, at: [<ffffffff8150adeb>] vfs_write+0x3eb/0x520 fs/read_write.c:556
 #2:  (&sb->s_type->i_mutex_key#9){++++++}, at: [<ffffffff816b2d02>] inode_lock include/linux/fs.h:766 [inline]
 #2:  (&sb->s_type->i_mutex_key#9){++++++}, at: [<ffffffff816b2d02>] ext4_file_write_iter+0x122/0xd70 fs/ext4/file.c:100
2 locks held by syz-executor1/8532:
 #0:  (sb_writers#4){.+.+.+}, at: [<ffffffff815012de>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#4){.+.+.+}, at: [<ffffffff815012de>] vfs_fallocate+0x2fe/0x620 fs/open.c:328
 #1:  (&sb->s_type->i_mutex_key#9){++++++}, at: [<ffffffff8178a636>] inode_lock include/linux/fs.h:766 [inline]
 #1:  (&sb->s_type->i_mutex_key#9){++++++}, at: [<ffffffff8178a636>] ext4_fallocate+0x366/0x1e80 fs/ext4/extents.c:4974

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

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.135+ #61
 ffff8801d9907d08 ffffffff81b36bf9 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff81098330 ffff8801d9907d40
 ffffffff81b41d09 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81b36bf9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b36bf9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81b41d09>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81b41c9c>] nmi_trigger_cpumask_backtrace+0x12c/0x151 lib/nmi_backtrace.c:60
 [<ffffffff81098434>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff8131c0dd>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8131c0dd>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8131c0dd>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8131c0dd>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
 [<ffffffff811428dd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff8280addc>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 8509 Comm: syz-executor1 Not tainted 4.9.135+ #61
task: ffff8801c904df00 task.stack: ffff8801ccd70000
RIP: 0010:[<ffffffff8120791a>] 
c [<ffffffff8120791a>] __lock_acquire+0x85a/0x4a10 kernel/locking/lockdep.c:3342
RSP: 0018:ffff8801db607b70  EFLAGS: 00000046
RAX: c7ba480e8ad8512d RBX: ffff8801c904e878 RCX: 00000000ffffffd8
RDX: 000000008ad8512d RSI: ffff8801c904e878 RDI: 0000000000000000
RBP: ffff8801db607d20 R08: ffff8801c904e898 R09: c7ba480e8ad8512d
R10: ffff8801c904df00 R11: 0000000000000001 R12: 00000000d2ddd2a4
R13: 0000000000000040 R14: 00000000b804b5b2 R15: 00000000d2d39b7b
FS:  00007ff0e84a4700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd280862000 CR3: 00000001d3a81000 CR4: 00000000001606b0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Stack:
 0000000000000033
c 0000000000000005
c 0000000000000000
c ffff8801c904e89a
c
 ffff8801db607d48
c 0000000000000046
c ffffffff81279583
c ffff8801db607be8
c
 ffffffff81b9ba7b
c ffff8801c904e878
c 0000000000000000
c 0000000000000000
c
Call Trace:
 [<ffffffff8120c5e0>] lock_acquire+0x130/0x3e0 kernel/locking/lockdep.c:3756
 [<ffffffff8127c48a>] seqcount_lockdep_reader_access include/linux/seqlock.h:80 [inline]
 [<ffffffff8127c48a>] read_seqcount_begin include/linux/seqlock.h:163 [inline]
 [<ffffffff8127c48a>] ktime_get+0x11a/0x1e0 kernel/time/timekeeping.c:757
 [<ffffffff8128e99c>] clockevents_program_event+0x1bc/0x3e0 kernel/time/clockevents.c:331
 [<ffffffff81293c8b>] tick_program_event+0xfb/0x180 kernel/time/tick-oneshot.c:47
 [<ffffffff8126c101>] hrtimer_interrupt+0x1e1/0x430 kernel/time/hrtimer.c:1366
 [<ffffffff81091254>] local_apic_timer_interrupt+0x74/0xa0 arch/x86/kernel/apic/apic.c:937
 [<ffffffff8280eadc>] smp_apic_timer_interrupt+0x7c/0xa0 arch/x86/kernel/apic/apic.c:961
 [<ffffffff8280c3ad>] apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:648
 <EOI> 
d [<ffffffff81202a0f>] ? arch_local_irq_restore arch/x86/include/asm/paravirt.h:768 [inline]
 <EOI> 
d [<ffffffff81202a0f>] ? lock_is_held+0xff/0x140 kernel/locking/lockdep.c:3796
 [<ffffffff8116770f>] ___might_sleep+0x1ff/0x260 kernel/sched/core.c:7954
 [<ffffffff81167805>] __might_sleep+0x95/0x1a0 kernel/sched/core.c:7945
 [<ffffffff815bd812>] __getblk_gfp+0x52/0x700 fs/buffer.c:1384
 [<ffffffff8177051d>] sb_getblk_gfp include/linux/buffer_head.h:325 [inline]
 [<ffffffff8177051d>] __read_extent_tree_block+0xad/0x770 fs/ext4/extents.c:521
 [<ffffffff81773d61>] ext4_find_extent+0x351/0x940 fs/ext4/extents.c:920
 [<ffffffff817b9cc6>] get_ext_path fs/ext4/move_extent.c:39 [inline]
 [<ffffffff817b9cc6>] mext_check_coverage.constprop.2+0x256/0x400 fs/ext4/move_extent.c:106
 [<ffffffff817bb6db>] move_extent_per_page fs/ext4/move_extent.c:333 [inline]
 [<ffffffff817bb6db>] ext4_move_extents+0x17bb/0x2a50 fs/ext4/move_extent.c:681
 [<ffffffff816ed76c>] ext4_ioctl+0x27fc/0x3620 fs/ext4/ioctl.c:594
 [<ffffffff81546ddc>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<ffffffff81546ddc>] file_ioctl fs/ioctl.c:493 [inline]
 [<ffffffff81546ddc>] do_vfs_ioctl+0x1ac/0x11a0 fs/ioctl.c:677
 [<ffffffff81547e5f>] SYSC_ioctl fs/ioctl.c:694 [inline]
 [<ffffffff81547e5f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
 [<ffffffff810056ef>] do_syscall_64+0x19f/0x550 arch/x86/entry/common.c:285
 [<ffffffff8280ac13>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
c89 
c5c 
c24 
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c89 
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c24 
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c00 
c00 
c00 
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cff 
cff 
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c24 
c98 
c00 
c00 
c00 
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c8b 
c5c 
c24 
c60 
c4c 
c8b 
c54 
c24 
c58 
c0f 
c84 
c1b 
c0e 
c00 
c00 
c<48> 
cb8 
c00 
c00 
c00 
c00 
c00 
cfc 
cff 
cdf 
c48 
c8b 
c54 
c24 
c78 
c48 
cc1 
cea 
c03 
c0f 
cb6 
c