IPVS: stopping backup sync thread 9508 ...
INFO: task syz-executor0:27655 blocked for more than 140 seconds.
      Not tainted 4.9.113-g8956c50 #15
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D28680 27655   3763 0x00000004
 ffff88019ced3000 ffff8801bfe29500 ffff8801bfe29500 ffff8801cc406000
 ffff8801db321c18 ffff8801c01a79b8 ffffffff839e929d ffffffff81235647
 0000000000000000 ffff88019ced38c0 0000000600000007 ffff8801db3224e8
Call Trace:
 [<ffffffff839ea89f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff839f5ed8>] __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:526 [inline]
 [<ffffffff839f5ed8>] rwsem_down_write_failed+0x598/0x990 kernel/locking/rwsem-xadd.c:555
 [<ffffffff81ee7587>] call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
 [<ffffffff839f3cac>] __down_write arch/x86/include/asm/rwsem.h:125 [inline]
 [<ffffffff839f3cac>] down_write+0x5c/0xa0 kernel/locking/rwsem.c:54
 [<ffffffff8161b931>] inode_lock include/linux/fs.h:766 [inline]
 [<ffffffff8161b931>] utimes_common.isra.1+0x2d1/0x5e0 fs/utimes.c:93
 [<ffffffff8161bdde>] do_utimes+0x19e/0x2c0 fs/utimes.c:159
 [<ffffffff8161bff7>] SYSC_utime fs/utimes.c:38 [inline]
 [<ffffffff8161bff7>] SyS_utime+0xf7/0x150 fs/utimes.c:27
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839fa193>] 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: [<ffffffff8136675c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136675c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.?..}, at: [<ffffffff81425de7>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/3668:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f8342>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff8211ee22>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
2 locks held by syz-executor0/27655:
 #0:  (sb_writers#12){.+.+.+}, at: [<ffffffff815e0a8f>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#12){.+.+.+}, at: [<ffffffff815e0a8f>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&type->i_mutex_dir_key#4){++++++}, at: [<ffffffff8161b931>] inode_lock include/linux/fs.h:766 [inline]
 #1:  (&type->i_mutex_dir_key#4){++++++}, at: [<ffffffff8161b931>] utimes_common.isra.1+0x2d1/0x5e0 fs/utimes.c:93

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

NMI backtrace for cpu 0
CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.113-g8956c50 #15
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8a9fd08 ffffffff81eb32a9 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810b9bd0 ffff8801d8a9fd40
 ffffffff81ebe5a7 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb32a9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb32a9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebe5a7>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebe53a>] 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
 [<ffffffff81366cf4>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81366cf4>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81366cf4>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81366cf4>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119d0ad>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839fa35c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 27641 Comm: syz-executor0 Not tainted 4.9.113-g8956c50 #15
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c1c08000 task.stack: ffff8801a1348000
RIP: 0010:[<ffffffff81235580>] 
c [<ffffffff81235580>] mark_held_locks+0x0/0x130 kernel/locking/lockdep.c:107
RSP: 0018:ffff8801a134f6a0  EFLAGS: 00000002
RAX: 0000000000000001 RBX: ffff8801c1c08000 RCX: 1ffff10038381122
RDX: 1ffff10038381116 RSI: 0000000000000001 RDI: ffff8801c1c08000
RBP: ffff8801a134f6b8 R08: ffff8801c1c08910 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff839f989a
R13: ffff8801a134f7f0 R14: ffff8801d8402c38 R15: 0000000000000001
FS:  00007f03e9688700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f30ee058000 CR3: 0000000196f5f000 CR4: 00000000001606f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 ffffffff81235a3b
c 0000000000000282
c ffff8801d8402c38
c ffff8801a134f6c8
c
 ffffffff81235c4d
c ffff8801a134f6e8
c ffffffff839f989a
c 1ffff10034269ee2
c
 fffffffffffffe00
c ffff8801a134f798
c ffffffff81221729
c ffff8801a134f720
c
Call Trace:
 [<ffffffff81235c4d>] trace_hardirqs_on+0xd/0x10 kernel/locking/lockdep.c:2743
 [<ffffffff839f989a>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:162 [inline]
 [<ffffffff839f989a>] _raw_spin_unlock_irqrestore+0x5a/0x70 kernel/locking/spinlock.c:191
 [<ffffffff81221729>] spin_unlock_irqrestore include/linux/spinlock.h:362 [inline]
 [<ffffffff81221729>] prepare_to_wait_event+0x1d9/0x450 kernel/sched/wait.c:238
 [<ffffffff81907bbe>] request_wait_answer+0x22e/0x6e0 fs/fuse/dev.c:459
 [<ffffffff819086c9>] __fuse_request_send+0x109/0x1b0 fs/fuse/dev.c:480
 [<ffffffff819087cd>] fuse_request_send+0x5d/0x70 fs/fuse/dev.c:493
 [<ffffffff81912a24>] fuse_simple_request+0x2f4/0x660 fs/fuse/dev.c:551
 [<ffffffff8191cffb>] fuse_do_setattr+0x68b/0x11e0 fs/fuse/dir.c:1722
 [<ffffffff8191dd42>] fuse_setattr+0x1f2/0x510 fs/fuse/dir.c:1822
 [<ffffffff815d3f90>] notify_change2+0xac0/0xdf0 fs/attr.c:313
 [<ffffffff8161b971>] utimes_common.isra.1+0x311/0x5e0 fs/utimes.c:94
 [<ffffffff8161bdde>] do_utimes+0x19e/0x2c0 fs/utimes.c:159
 [<ffffffff8161bff7>] SYSC_utime fs/utimes.c:38 [inline]
 [<ffffffff8161bff7>] SyS_utime+0xf7/0x150 fs/utimes.c:27
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839fa193>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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c<55> 
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c