attempt to access beyond end of device
loop5: rw=48, want=8200, limit=20
attempt to access beyond end of device
loop5: rw=48, want=12296, limit=20
F2FS-fs (loop5): Failed to get valid F2FS checkpoint
INFO: task syz-executor.1:20648 blocked for more than 140 seconds.
      Not tainted 4.9.189+ #3
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1  D25528 20648      1 0x00000004
 0000000000000087 ffff88019e284740 ffff8801d10cdd80 ffff8801db721000
 ffff8801d18597c0 ffff8801db721018 ffff8801c7aef598 ffffffff82818d1e
 ffffffff82e2f248 ffffffff8120cd80 00ffffff83c84a80 ffff8801db7218f0
Call Trace:
 [<00000000f944192c>] schedule+0x92/0x1c0 kernel/sched/core.c:3546
 [<00000000fb784f73>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3579
 [<00000000ceb55011>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<00000000ceb55011>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621
 [<00000000d3a7e6f6>] fuse_lock_inode+0xad/0xe0 fs/fuse/inode.c:364
 [<0000000095868b0a>] fuse_lookup+0x89/0x3b0 fs/fuse/dir.c:406
 [<00000000b02c0f4f>] lookup_slow+0x24b/0x480 fs/namei.c:1709
 [<00000000d16709f0>] walk_component+0x71e/0xce0 fs/namei.c:1825
 [<00000000fe337c1a>] link_path_walk+0x8b4/0x1210 fs/namei.c:2161
 [<000000000aadc524>] path_mountpoint+0x67/0x6d0 fs/namei.c:2737
 [<00000000719f4cca>] filename_mountpoint+0x17f/0x350 fs/namei.c:2758
 [<00000000453f3e66>] user_path_mountpoint_at+0x3a/0x50 fs/namei.c:2788
 [<0000000043e7cfbd>] SYSC_umount fs/namespace.c:1722 [inline]
 [<0000000043e7cfbd>] SyS_umount+0x136/0xd30 fs/namespace.c:1706
 [<00000000520787ff>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288
 [<0000000044893e1e>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb

Showing all locks held in the system:
2 locks held by khungtaskd/24:
 #0:  (rcu_read_lock){......}, at: [<000000000eefcefb>] check_hung_uninterruptible_tasks kernel/hung_task.c:169 [inline]
 #0:  (rcu_read_lock){......}, at: [<000000000eefcefb>] watchdog+0x14b/0xaf0 kernel/hung_task.c:263
 #1:  (tasklist_lock){.+.?..}, at: [<00000000c601101d>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336
2 locks held by rs:main Q:Reg/1893:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<000000003bcbf8ae>] __fdget_pos+0xa8/0xd0 fs/file.c:782
 #1:  (sb_writers#4){.+.+.+}, at: [<00000000a312a3c9>] file_start_write include/linux/fs.h:2646 [inline]
 #1:  (sb_writers#4){.+.+.+}, at: [<00000000a312a3c9>] vfs_write+0x3e9/0x520 fs/read_write.c:558
1 lock held by rsyslogd/1895:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<000000003bcbf8ae>] __fdget_pos+0xa8/0xd0 fs/file.c:782
2 locks held by getty/2023:
 #0:  (&tty->ldisc_sem){++++++}, at: [<00000000a054b4e1>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<000000005e8e428a>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156
2 locks held by syz-executor.1/20648:
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<0000000022405a68>] inode_lock_shared include/linux/fs.h:781 [inline]
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<0000000022405a68>] lookup_slow+0x160/0x480 fs/namei.c:1686
 #1:  (&fi->mutex){+.+.+.}, at: [<00000000d3a7e6f6>] fuse_lock_inode+0xad/0xe0 fs/fuse/inode.c:364
1 lock held by syz-executor.5/20811:
 #0:  (&pipe->mutex/1){+.+.+.}, at: [<00000000f346aa67>] pipe_lock_nested fs/pipe.c:66 [inline]
 #0:  (&pipe->mutex/1){+.+.+.}, at: [<00000000f346aa67>] pipe_lock+0x63/0x80 fs/pipe.c:74
1 lock held by syz-executor.5/20825:
 #0:  (&pipe->mutex/1){+.+.+.}, at: [<00000000f346aa67>] pipe_lock_nested fs/pipe.c:66 [inline]
 #0:  (&pipe->mutex/1){+.+.+.}, at: [<00000000f346aa67>] pipe_lock+0x63/0x80 fs/pipe.c:74
2 locks held by syz-executor.1/21188:
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<0000000022405a68>] inode_lock_shared include/linux/fs.h:781 [inline]
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<0000000022405a68>] lookup_slow+0x160/0x480 fs/namei.c:1686
 #1:  (&fi->mutex){+.+.+.}, at: [<00000000d3a7e6f6>] fuse_lock_inode+0xad/0xe0 fs/fuse/inode.c:364

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

NMI backtrace for cpu 0
CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.189+ #3
 ffff8801d98d7cc8 ffffffff81b65c01 0000000000000000 0000000000000000
 0000000000000000 ffffffff81099a01 dffffc0000000000 ffff8801d98d7d00
 ffffffff81b70e9c 0000000000000000 0000000000000000 0000000000000000
Call Trace:
 [<000000000d6efd41>] __dump_stack lib/dump_stack.c:15 [inline]
 [<000000000d6efd41>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<000000002367f2d6>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99
 [<000000009e24db7d>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60
 [<00000000a7604649>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<00000000a6b80e1f>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<00000000a6b80e1f>] check_hung_task kernel/hung_task.c:126 [inline]
 [<00000000a6b80e1f>] check_hung_uninterruptible_tasks kernel/hung_task.c:183 [inline]
 [<00000000a6b80e1f>] watchdog+0x670/0xaf0 kernel/hung_task.c:263
 [<00000000a18b0a92>] kthread+0x278/0x310 kernel/kthread.c:211
 [<00000000cfdf293c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff82827e71