INFO: task syz-executor0:24169 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-executor0   D29376 24169  11891 0x00000004
 ffff88019ffee000 0000000000000000 ffff8801be744000 ffff8801d9a6b000
 ffff8801db321c18 ffff8801aee279c8 ffffffff839e6ded ffffffff812355f7
 0000000000000000 ffff88019ffee8c0 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
 [<ffffffff81593fa6>] inode_lock_nested include/linux/fs.h:801 [inline]
 [<ffffffff81593fa6>] lock_rename+0x236/0x290 fs/namei.c:2857
 [<ffffffff815aeedd>] SYSC_renameat2 fs/namei.c:4607 [inline]
 [<ffffffff815aeedd>] SyS_renameat2 fs/namei.c:4546 [inline]
 [<ffffffff815aeedd>] SYSC_rename fs/namei.c:4697 [inline]
 [<ffffffff815aeedd>] SyS_rename+0x3bd/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 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/3774:
 #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
2 locks held by syz-executor0/24169:
 #0:  (sb_writers#13){.+.+.+}, at: [<ffffffff815e08df>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#13){.+.+.+}, at: [<ffffffff815e08df>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#18/1){+.+.+.}, at: [<ffffffff81593fa6>] inode_lock_nested include/linux/fs.h:801 [inline]
 #1:  (&sb->s_type->i_mutex_key#18/1){+.+.+.}, at: [<ffffffff81593fa6>] lock_rename+0x236/0x290 fs/namei.c:2857
2 locks held by syz-executor0/24171:
 #0:  (sb_writers#13){.+.+.+}, at: [<ffffffff815e08df>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#13){.+.+.+}, at: [<ffffffff815e08df>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#18){++++++}, at: [<ffffffff815a4ca5>] inode_lock include/linux/fs.h:766 [inline]
 #1:  (&sb->s_type->i_mutex_key#18){++++++}, at: [<ffffffff815a4ca5>] do_last fs/namei.c:3312 [inline]
 #1:  (&sb->s_type->i_mutex_key#18){++++++}, at: [<ffffffff815a4ca5>] path_openat+0xed5/0x3590 fs/namei.c:3534
2 locks held by syz-executor0/24174:
 #0:  (sb_writers#13){.+.+.+}, at: [<ffffffff815e08df>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#13){.+.+.+}, at: [<ffffffff815e08df>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#18/1){+.+.+.}, at: [<ffffffff81593fa6>] inode_lock_nested include/linux/fs.h:801 [inline]
 #1:  (&sb->s_type->i_mutex_key#18/1){+.+.+.}, at: [<ffffffff81593fa6>] lock_rename+0x236/0x290 fs/namei.c:2857

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

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
 ffff8801d9377d08 ffffffff81eb2329 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b9580 ffff8801d9377d40
 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: 24123 Comm: syz-executor0 Not tainted 4.9.110-g00a0bcb #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801a848c800 task.stack: ffff8801b9240000
RIP: 0010:[<ffffffff839f7bee>] 
c [<ffffffff839f7bee>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
RIP: 0010:[<ffffffff839f7bee>] 
c [<ffffffff839f7bee>] _raw_spin_lock_irqsave+0x2e/0x62 kernel/locking/spinlock.c:159
RSP: 0000:ffff8801db207d08  EFLAGS: 00000097
RAX: 0000000000010002 RBX: ffffffff85ba9808 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff85b2d6c0
RBP: ffff8801db207d20 R08: 7fffffffffffffff R09: 000000000000000a
R10: ffffed0043fffa01 R11: 0000000000000001 R12: 0000000000000092
R13: ffffffff85ba9808 R14: ffff88019fa97848 R15: dffffc0000000000
FS:  00007f1e76adf700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000259f298 CR3: 00000001a37d7000 CR4: 00000000001606f0
DR0: 0000000020000000 DR1: 00000000200001c0 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 ffff8801a848d188
c 0000000000016a80
c 1ffff1003b640fa8
c ffff8801db207de8
c
 ffffffff81f1ad07
c ffffffff85ba9800
c ffffffff846e8ca0
c 0000000041b58ab3
c
 ffffffff843e3cbb
c ffffffff81f1ac10
c ffff8801a848c800
c ffffed0035091a18
c
Call Trace:
 <IRQ> 
d [<ffffffff81f1ad07>] debug_object_deactivate+0xf7/0x340 lib/debugobjects.c:475
 [<ffffffff812a44f2>] debug_hrtimer_deactivate kernel/time/hrtimer.c:403 [inline]
 [<ffffffff812a44f2>] debug_deactivate kernel/time/hrtimer.c:450 [inline]
 [<ffffffff812a44f2>] __run_hrtimer kernel/time/hrtimer.c:1224 [inline]
 [<ffffffff812a44f2>] __hrtimer_run_queues+0x222/0xe50 kernel/time/hrtimer.c:1319
 [<ffffffff812a5b81>] hrtimer_interrupt+0x1b1/0x430 kernel/time/hrtimer.c:1353
 [<ffffffff810b1d34>] local_apic_timer_interrupt+0x74/0xa0 arch/x86/kernel/apic/apic.c:935
 [<ffffffff839fd49c>] smp_apic_timer_interrupt+0x7c/0xa0 arch/x86/kernel/apic/apic.c:959
 [<ffffffff839f9630>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:648
 <EOI> 
d [<ffffffff8143a011>] ? pagecache_get_page+0x131/0x720 mm/filemap.c:1228
 [<ffffffff8143a011>] pagecache_get_page+0x131/0x720 mm/filemap.c:1228
 [<ffffffff816252a9>] find_or_create_page include/linux/pagemap.h:309 [inline]
 [<ffffffff816252a9>] grow_dev_page fs/buffer.c:1005 [inline]
 [<ffffffff816252a9>] grow_buffers fs/buffer.c:1078 [inline]
 [<ffffffff816252a9>] __getblk_slow fs/buffer.c:1105 [inline]
 [<ffffffff816252a9>] __getblk_gfp+0x249/0x710 fs/buffer.c:1386
 [<ffffffff81628b8d>] __bread_gfp+0x2d/0x270 fs/buffer.c:1420
 [<ffffffff818b6de8>] sb_bread include/linux/buffer_head.h:300 [inline]
 [<ffffffff818b6de8>] fat__get_entry+0x4c8/0x8f0 fs/fat/dir.c:100
 [<ffffffff818bebe7>] fat_get_entry fs/fat/dir.c:128 [inline]
 [<ffffffff818bebe7>] fat_search_long+0x277/0x1180 fs/fat/dir.c:477
 [<ffffffff818d9074>] vfat_find+0x134/0x180 fs/fat/namei_vfat.c:708
 [<ffffffff818d9851>] vfat_lookup+0xe1/0x530 fs/fat/namei_vfat.c:731
 [<ffffffff8159b05d>] lookup_open+0x63d/0x1930 fs/namei.c:3203
 [<ffffffff815a4cc8>] do_last fs/namei.c:3315 [inline]
 [<ffffffff815a4cc8>] path_openat+0xef8/0x3590 fs/namei.c:3534
 [<ffffffff815ab627>] do_filp_open+0x197/0x270 fs/namei.c:3568
 [<ffffffff8156ddfd>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
 [<ffffffff8156e0dd>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff8156e0dd>] SyS_open+0x2d/0x40 fs/open.c:1085
 [<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