F2FS-fs (loop4): Unrecognized mount option "+Éj" or missing value
IPVS: stopping backup sync thread 10136 ...
INFO: task syz-executor0:19349 blocked for more than 140 seconds.
      Not tainted 4.9.119-g9dc978d #23
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D27864 19349  17625 0x00000004
 ffff88019a6b8000 ffff8801d39bc540 ffff8801d39bc540 ffff880199f46000
 ffff8801db221c18 ffff880198dd7728 ffffffff839ebdcd ffffffff81235627
 0000000000000000 ffff88019a6b88c0 0000000600000007 ffff8801db2224e8
Call Trace:
 [<ffffffff839ed3cf>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff839f8a08>] __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:526 [inline]
 [<ffffffff839f8a08>] rwsem_down_write_failed+0x598/0x990 kernel/locking/rwsem-xadd.c:555
 [<ffffffff81ee8ec7>] call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
 [<ffffffff839f67dc>] __down_write arch/x86/include/asm/rwsem.h:125 [inline]
 [<ffffffff839f67dc>] down_write+0x5c/0xa0 kernel/locking/rwsem.c:54
 [<ffffffff8156abe8>] inode_lock include/linux/fs.h:766 [inline]
 [<ffffffff8156abe8>] do_truncate2+0x128/0x1f0 fs/open.c:61
 [<ffffffff815a67ee>] handle_truncate fs/namei.c:2990 [inline]
 [<ffffffff815a67ee>] do_last fs/namei.c:3419 [inline]
 [<ffffffff815a67ee>] path_openat+0x251e/0x3590 fs/namei.c:3534
 [<ffffffff815abb27>] do_filp_open+0x197/0x270 fs/namei.c:3568
 [<ffffffff8156e2fd>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
 [<ffffffff8156e657>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff8156e657>] SyS_open fs/open.c:1085 [inline]
 [<ffffffff8156e657>] SYSC_creat fs/open.c:1110 [inline]
 [<ffffffff8156e657>] SyS_creat+0x27/0x30 fs/open.c:1108
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839fccd3>] 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: [<ffffffff813667bc>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff813667bc>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81426027>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/3726:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839fae72>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff821208d2>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
2 locks held by syz-executor0/19349:
 #0:  (sb_writers#14){.+.+.+}, at: [<ffffffff815e0e3f>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#14){.+.+.+}, at: [<ffffffff815e0e3f>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#23){++++++}, at: [<ffffffff8156abe8>] inode_lock include/linux/fs.h:766 [inline]
 #1:  (&sb->s_type->i_mutex_key#23){++++++}, at: [<ffffffff8156abe8>] do_truncate2+0x128/0x1f0 fs/open.c:61
2 locks held by syz-executor0/19388:
 #0:  (sb_writers#14){.+.+.+}, at: [<ffffffff815e0e3f>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#14){.+.+.+}, at: [<ffffffff815e0e3f>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#23){++++++}, at: [<ffffffff8156abe8>] inode_lock include/linux/fs.h:766 [inline]
 #1:  (&sb->s_type->i_mutex_key#23){++++++}, at: [<ffffffff8156abe8>] do_truncate2+0x128/0x1f0 fs/open.c:61
1 lock held by syz-executor0/19440:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d859c>] __fdget_pos+0xac/0xd0 fs/file.c:781

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

NMI backtrace for cpu 1
CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.119-g9dc978d #23
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8657d08 ffffffff81eb4be9 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b9bd0 ffff8801d8657d40
 ffffffff81ebfee7 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb4be9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb4be9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebfee7>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebfe7a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b9cd4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81366d54>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81366d54>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81366d54>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81366d54>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119d0ed>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839fce9c>] 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: 8021 Comm: kworker/u4:12 Not tainted 4.9.119-g9dc978d #23
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: writeback wb_workfn
c (flush-7:0)
c
task: ffff88019af41800 task.stack: ffff88019ab08000
RIP: 0010:[<ffffffff8123b5c5>] 
c [<ffffffff8123b5c5>] arch_local_irq_restore arch/x86/include/asm/paravirt.h:768 [inline]
RIP: 0010:[<ffffffff8123b5c5>] 
c [<ffffffff8123b5c5>] lock_release+0x6a5/0xb80 kernel/locking/lockdep.c:3778
RSP: 0018:ffff88019ab0f528  EFLAGS: 00000246
RAX: 0000000000000007 RBX: ffff88019af41800 RCX: ffff88019af41800
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000246
RBP: ffff88019ab0f5d0 R08: ffff88019af42188 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff100335e842c R12: dffffc0000000000
R13: ffff88019af42168 R14: 0000000000000005 R15: 0000000000000004
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe51769f80 CR3: 00000001c356e000 CR4: 00000000001606f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Stack:
 ffff8801cbfdc890
c ffff88019af41800
c ffffed00335e8418
c ffff88019af420c8
c
 ffffffff846defa0
c 0000000000000004
c ffff88019ab0f598
c ffff88019ab0f5a0
c
 ffffffff81f1c62b
c ffff88019af420c0
c ffff88019af420c8
c 0000000000000246
c
Call Trace:
 [<ffffffff81438fb2>] rcu_lock_release include/linux/rcupdate.h:498 [inline]
 [<ffffffff81438fb2>] rcu_read_unlock include/linux/rcupdate.h:931 [inline]
 [<ffffffff81438fb2>] find_get_entry+0x142/0x540 mm/filemap.c:1130
 [<ffffffff8143a2eb>] pagecache_get_page+0x4b/0x720 mm/filemap.c:1201
 [<ffffffff81625809>] find_or_create_page include/linux/pagemap.h:309 [inline]
 [<ffffffff81625809>] grow_dev_page fs/buffer.c:1005 [inline]
 [<ffffffff81625809>] grow_buffers fs/buffer.c:1078 [inline]
 [<ffffffff81625809>] __getblk_slow fs/buffer.c:1105 [inline]
 [<ffffffff81625809>] __getblk_gfp+0x249/0x710 fs/buffer.c:1386
 [<ffffffff816290ed>] __bread_gfp+0x2d/0x270 fs/buffer.c:1420
 [<ffffffff818d69e1>] sb_bread include/linux/buffer_head.h:300 [inline]
 [<ffffffff818d69e1>] fat_clusters_flush+0x111/0x380 fs/fat/misc.c:69
 [<ffffffff818d0942>] fat_write_inode+0xf2/0x170 fs/fat/inode.c:898
 [<ffffffff8160273d>] write_inode fs/fs-writeback.c:1180 [inline]
 [<ffffffff8160273d>] __writeback_single_inode+0x86d/0x1020 fs/fs-writeback.c:1379
 [<ffffffff81603a3c>] writeback_sb_inodes+0x4ac/0xe70 fs/fs-writeback.c:1584
 [<ffffffff816044fb>] __writeback_inodes_wb+0xfb/0x1e0 fs/fs-writeback.c:1653
 [<ffffffff81604c82>] wb_writeback+0x512/0xbd0 fs/fs-writeback.c:1762
 [<ffffffff8160e5b0>] wb_check_old_data_flush fs/fs-writeback.c:1877 [inline]
 [<ffffffff8160e5b0>] wb_do_writeback fs/fs-writeback.c:1901 [inline]
 [<ffffffff8160e5b0>] wb_workfn+0x850/0xdb0 fs/fs-writeback.c:1930
 [<ffffffff8118d181>] process_one_work+0x7e1/0x1500 kernel/workqueue.c:2092
 [<ffffffff8118df76>] worker_thread+0xd6/0x10a0 kernel/workqueue.c:2226
 [<ffffffff8119d0ed>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839fce9c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Code: 
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