INFO: task syz-executor0:16254 blocked for more than 120 seconds.
      Not tainted 4.9.111-g03c70fe #5
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D29992 16254   7092 0x00000004
 ffff88019f4f4800 0000000000000000 ffff88019ead0000 ffff8801d9a6b000
 ffff8801db321c18 ffff8801a7c5f9c8 ffffffff839e7ded ffffffff81235607
 0000000000000000 ffff88019f4f50c0 0000000600000007 ffff8801db3224e8
Call Trace:
 [<ffffffff839e93ef>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839f4a28>] __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:526 [inline]
 [<ffffffff839f4a28>] rwsem_down_write_failed+0x598/0x990 kernel/locking/rwsem-xadd.c:555
 [<ffffffff81ee6a07>] call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
 [<ffffffff8122c230>] __down_write arch/x86/include/asm/rwsem.h:125 [inline]
 [<ffffffff8122c230>] down_write_nested+0x60/0xa0 kernel/locking/rwsem.c:174
 [<ffffffff81594076>] inode_lock_nested include/linux/fs.h:801 [inline]
 [<ffffffff81594076>] lock_rename+0x236/0x290 fs/namei.c:2857
 [<ffffffff815aefad>] SYSC_renameat2 fs/namei.c:4607 [inline]
 [<ffffffff815aefad>] SyS_renameat2 fs/namei.c:4546 [inline]
 [<ffffffff815aefad>] SYSC_rename fs/namei.c:4697 [inline]
 [<ffffffff815aefad>] SyS_rename+0x3bd/0x800 fs/namei.c:4695
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f8cd3>] 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: [<ffffffff813666fc>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff813666fc>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81425d87>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/3612:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f6e92>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff8211e602>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133
2 locks held by syz-executor0/16254:
 #0:  (sb_writers#12){.+.+.+}, at: [<ffffffff815e09af>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#12){.+.+.+}, at: [<ffffffff815e09af>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#16/1){+.+.+.}, at: [<ffffffff81594076>] inode_lock_nested include/linux/fs.h:801 [inline]
 #1:  (&sb->s_type->i_mutex_key#16/1){+.+.+.}, at: [<ffffffff81594076>] lock_rename+0x236/0x290 fs/namei.c:2857
2 locks held by syz-executor0/16256:
 #0:  (sb_writers#12){.+.+.+}, at: [<ffffffff815e09af>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#12){.+.+.+}, at: [<ffffffff815e09af>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#16){++++++}, at: [<ffffffff815a4d75>] inode_lock include/linux/fs.h:766 [inline]
 #1:  (&sb->s_type->i_mutex_key#16){++++++}, at: [<ffffffff815a4d75>] do_last fs/namei.c:3312 [inline]
 #1:  (&sb->s_type->i_mutex_key#16){++++++}, at: [<ffffffff815a4d75>] path_openat+0xed5/0x3590 fs/namei.c:3534

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

NMI backtrace for cpu 1
CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.111-g03c70fe #5
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8687d08 ffffffff81eb2729 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b9af0 ffff8801d8687d40
 ffffffff81ebda27 0000000000000001 0000000000000000 0000000000000002
Call Trace:
 [<ffffffff81eb2729>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb2729>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebda27>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebd9ba>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b9bf4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81366c94>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81366c94>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81366c94>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81366c94>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119d05d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f8e9c>] 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: 16199 Comm: syz-executor0 Not tainted 4.9.111-g03c70fe #5
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88019d6e8000 task.stack: ffff8801c28d8000
RIP: 0010:[<ffffffff8122fdf3>] 
c [<ffffffff8122fdf3>] match_held_lock+0x223/0x570 kernel/locking/lockdep.c:3435
RSP: 0018:ffff8801db207d38  EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff88019d6e8000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff846def20 RDI: ffff88019d6e88ea
RBP: ffff8801db207d68 R08: ffff88019d6e8988 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff10033add12c R12: ffffed0033add118
R13: ffff88019d6e88c8 R14: ffffffff846def20 R15: 0000000000000000
FS:  00007fc0e431a700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1b279a2f80 CR3: 00000001c4731000 CR4: 00000000001606f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 ffffffff846e8ca0
c ffff88019d6e8000
c ffffed0033add118
c ffff88019d6e88c8
c
 ffffffff846def20
c 0000000000000000
c ffff8801db207da8
c ffffffff812301e2
c
 ffff88019d6e88c0
c 0000000000000046
c ffff88019d6e8000
c ffffffff846def20
c
Call Trace:
 <IRQ> 
d [<ffffffff812301e2>] __lock_is_held+0xa2/0xf0 kernel/locking/lockdep.c:3597
 [<ffffffff81230a14>] lock_is_held+0xb4/0x140 kernel/locking/lockdep.c:3794
 [<ffffffff8127c123>] rcu_read_lock_sched_held+0x103/0x120 kernel/rcu/update.c:112
 [<ffffffff812a4e80>] trace_hrtimer_cancel include/trace/events/timer.h:269 [inline]
 [<ffffffff812a4e80>] debug_deactivate kernel/time/hrtimer.c:451 [inline]
 [<ffffffff812a4e80>] __run_hrtimer kernel/time/hrtimer.c:1224 [inline]
 [<ffffffff812a4e80>] __hrtimer_run_queues+0xae0/0xe50 kernel/time/hrtimer.c:1319
 [<ffffffff812a5c51>] hrtimer_interrupt+0x1b1/0x430 kernel/time/hrtimer.c:1353
 [<ffffffff810b22a4>] local_apic_timer_interrupt+0x74/0xa0 arch/x86/kernel/apic/apic.c:935
 [<ffffffff839fe49c>] smp_apic_timer_interrupt+0x7c/0xa0 arch/x86/kernel/apic/apic.c:959
 [<ffffffff839fa630>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:648
 <EOI> 
d [<ffffffff816243fa>] ? arch_local_irq_enable arch/x86/include/asm/paravirt.h:778 [inline]
 <EOI> 
d [<ffffffff816243fa>] ? lookup_bh_lru fs/buffer.c:1344 [inline]
 <EOI> 
d [<ffffffff816243fa>] ? __find_get_block+0x18a/0x4c0 fs/buffer.c:1356
 [<ffffffff816252b9>] __getblk_slow fs/buffer.c:1101 [inline]
 [<ffffffff816252b9>] __getblk_gfp+0x189/0x710 fs/buffer.c:1386
 [<ffffffff81628c5d>] __bread_gfp+0x2d/0x270 fs/buffer.c:1420
 [<ffffffff818b6eb8>] sb_bread include/linux/buffer_head.h:300 [inline]
 [<ffffffff818b6eb8>] fat__get_entry+0x4c8/0x8f0 fs/fat/dir.c:100
 [<ffffffff818becb7>] fat_get_entry fs/fat/dir.c:128 [inline]
 [<ffffffff818becb7>] fat_search_long+0x277/0x1180 fs/fat/dir.c:477
 [<ffffffff818d9144>] vfat_find+0x134/0x180 fs/fat/namei_vfat.c:708
 [<ffffffff818d9921>] vfat_lookup+0xe1/0x530 fs/fat/namei_vfat.c:731
 [<ffffffff8159b12d>] lookup_open+0x63d/0x1930 fs/namei.c:3203
 [<ffffffff815a4d98>] do_last fs/namei.c:3315 [inline]
 [<ffffffff815a4d98>] path_openat+0xef8/0x3590 fs/namei.c:3534
 [<ffffffff815ab6f7>] do_filp_open+0x197/0x270 fs/namei.c:3568
 [<ffffffff8156decd>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
 [<ffffffff8156e1ad>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff8156e1ad>] SyS_open+0x2d/0x40 fs/open.c:1085
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f8cd3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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