INFO: task syz-executor1:7665 blocked for more than 120 seconds.
      Not tainted 4.9.110-g00a0bcb #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor1   D28536  7665   3874 0x00000004
 ffff8801d903b000 ffff8801b6f39f80 ffff8801bf749a40 ffff8801d8d71800
 ffff8801db321c18 ffff88019fc9f898 ffffffff839e6ded ffffffff812355f7
 0000000000000000 ffff8801d903b8c0 0000000600000007 ffff8801db3224e8
Call Trace:
 [<ffffffff839e83ef>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839f3a28>] __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:526 [inline]
 [<ffffffff839f3a28>] rwsem_down_write_failed+0x598/0x990 kernel/locking/rwsem-xadd.c:555
 [<ffffffff81ee6607>] call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
 [<ffffffff8122c220>] __down_write arch/x86/include/asm/rwsem.h:125 [inline]
 [<ffffffff8122c220>] down_write_nested+0x60/0xa0 kernel/locking/rwsem.c:174
 [<ffffffff815cc138>] inode_lock_nested include/linux/fs.h:801 [inline]
 [<ffffffff815cc138>] lock_two_nondirectories+0xb8/0xf0 fs/inode.c:983
 [<ffffffff815969ea>] vfs_rename2+0x42a/0x18f0 fs/namei.c:4473
 [<ffffffff815af132>] SYSC_renameat2 fs/namei.c:4657 [inline]
 [<ffffffff815af132>] SyS_renameat2 fs/namei.c:4546 [inline]
 [<ffffffff815af132>] SYSC_rename fs/namei.c:4697 [inline]
 [<ffffffff815af132>] SyS_rename+0x612/0x800 fs/namei.c:4695
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f7cd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by kworker/u4:2/89:
 #0:  ("writeback"){.+.+.+}, at: [<ffffffff8118d02e>] work_static include/linux/workqueue.h:186 [inline]
 #0:  ("writeback"){.+.+.+}, at: [<ffffffff8118d02e>] set_work_data kernel/workqueue.c:617 [inline]
 #0:  ("writeback"){.+.+.+}, at: [<ffffffff8118d02e>] set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
 #0:  ("writeback"){.+.+.+}, at: [<ffffffff8118d02e>] process_one_work+0x6ee/0x1500 kernel/workqueue.c:2085
 #1:  ((&(&wb->dwork)->work)){+.+.+.}, at: [<ffffffff8118d068>] process_one_work+0x728/0x1500 kernel/workqueue.c:2089
2 locks held by khungtaskd/519:
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136662c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136662c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81425cb7>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/3777:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f5e92>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff8211e1e2>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133
3 locks held by syz-executor1/7665:
 #0:  (sb_writers#12){.+.+.+}, at: [<ffffffff815e08df>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#12){.+.+.+}, at: [<ffffffff815e08df>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#15/1){+.+.+.}, at: [<ffffffff81593fa6>] inode_lock_nested include/linux/fs.h:801 [inline]
 #1:  (&sb->s_type->i_mutex_key#15/1){+.+.+.}, at: [<ffffffff81593fa6>] lock_rename+0x236/0x290 fs/namei.c:2857
 #2:  (&sb->s_type->i_mutex_key#15/4){+.+.+.}, at: [<ffffffff815cc138>] inode_lock_nested include/linux/fs.h:801 [inline]
 #2:  (&sb->s_type->i_mutex_key#15/4){+.+.+.}, at: [<ffffffff815cc138>] lock_two_nondirectories+0xb8/0xf0 fs/inode.c:983

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

NMI backtrace for cpu 1
CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.110-g00a0bcb #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d9067d08 ffffffff81eb2329 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b9580 ffff8801d9067d40
 ffffffff81ebd627 0000000000000001 0000000000000000 0000000000000002
Call Trace:
 [<ffffffff81eb2329>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb2329>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebd627>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebd5ba>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b9684>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81366bc4>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81366bc4>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81366bc4>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81366bc4>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119d04d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f7e9c>] 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: 7612 Comm: syz-executor1 Not tainted 4.9.110-g00a0bcb #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801a069b000 task.stack: ffff8801c1b58000
RIP: 0010:[<ffffffff8135e944>] 
c [<ffffffff8135e944>] __sanitizer_cov_trace_pc+0x4/0x50 kernel/kcov.c:93
RSP: 0018:ffff8801c1b5f778  EFLAGS: 00000202
RAX: 0000000000000246 RBX: 0000000000000001 RCX: ffffc900072f6000
RDX: 0000000000040000 RSI: ffffffff816241c1 RDI: ffff8801cbfe9700
RBP: ffff8801c1b5f778 R08: ffff8801a069b960 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff100340d3727 R12: ffffea000672491c
R13: ffffea0006724900 R14: 0000000000000200 R15: dffffc0000000000
FS:  00007f1c7ab48700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5bef79b140 CR3: 00000001ce8e4000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801c1b5f7c8
c ffffffff816241d6
c 0000020006724900
c 0000000000000041
c
 ffff8801cbfe9700
c 0000000000000001
c ffffea000672491c
c ffffea0006724900
c
 0000000000000200
c dffffc0000000000
c ffff8801c1b5f868
c ffffffff816251e9
c
Call Trace:
 [<ffffffff816241d6>] arch_local_irq_disable arch/x86/include/asm/paravirt.h:773 [inline]
 [<ffffffff816241d6>] lookup_bh_lru fs/buffer.c:1325 [inline]
 [<ffffffff816241d6>] __find_get_block+0x36/0x4c0 fs/buffer.c:1356
 [<ffffffff816251e9>] __getblk_slow fs/buffer.c:1101 [inline]
 [<ffffffff816251e9>] __getblk_gfp+0x189/0x710 fs/buffer.c:1386
 [<ffffffff81628b8d>] __bread_gfp+0x2d/0x270 fs/buffer.c:1420
 [<ffffffff818cbb0b>] sb_bread include/linux/buffer_head.h:300 [inline]
 [<ffffffff818cbb0b>] __fat_write_inode+0x2ab/0x980 fs/fat/inode.c:844
 [<ffffffff818cfd19>] fat_write_inode+0x79/0x170 fs/fat/inode.c:893
 [<ffffffff816021dd>] write_inode fs/fs-writeback.c:1180 [inline]
 [<ffffffff816021dd>] __writeback_single_inode+0x86d/0x1020 fs/fs-writeback.c:1379
 [<ffffffff8160502f>] writeback_single_inode+0x24f/0x440 fs/fs-writeback.c:1433
 [<ffffffff816052fc>] sync_inode fs/fs-writeback.c:2458 [inline]
 [<ffffffff816052fc>] sync_inode_metadata+0xac/0xe0 fs/fs-writeback.c:2478
 [<ffffffff815f4d91>] __generic_file_fsync+0x141/0x1a0 fs/libfs.c:985
 [<ffffffff815f4e67>] generic_file_fsync+0x77/0x110 fs/libfs.c:1011
 [<ffffffff818c7797>] fat_file_fsync+0x77/0x170 fs/fat/file.c:165
 [<ffffffff8161a69c>] vfs_fsync_range+0x10c/0x260 fs/sync.c:195
 [<ffffffff8143dd52>] generic_write_sync include/linux/fs.h:2607 [inline]
 [<ffffffff8143dd52>] generic_file_write_iter+0x442/0x610 mm/filemap.c:2897
 [<ffffffff8156eb60>] new_sync_write fs/read_write.c:496 [inline]
 [<ffffffff8156eb60>] __vfs_write+0x3e0/0x580 fs/read_write.c:509
 [<ffffffff81572957>] vfs_write+0x187/0x530 fs/read_write.c:557
 [<ffffffff81576789>] SYSC_write fs/read_write.c:604 [inline]
 [<ffffffff81576789>] SyS_write+0xd9/0x1c0 fs/read_write.c:596
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f7cd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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c