sock: process `syz-executor4' is using obsolete setsockopt SO_BSDCOMPAT
INFO: task syz-executor3:9902 blocked for more than 140 seconds.
      Not tainted 4.9.116-g0137ea2 #18
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor3   D27656  9902   3877 0x00000004
 ffff8801d8b2e000 ffff8801c6129f80 ffff8801c6129f80 ffff8801ca7e8000
 ffff8801db321c18 ffff88019d31f650 ffffffff839ead0d dffffc0000000000
 ffff8801d61fe3d0 ffff88019d31f610 00ff8801d8b2e8c0 ffff8801db3224e8
Call Trace:
 [<ffffffff839ec30f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff815c7ec2>] d_wait_lookup fs/dcache.c:2455 [inline]
 [<ffffffff815c7ec2>] d_alloc_parallel+0xeb2/0x17c0 fs/dcache.c:2537
 [<ffffffff81594e7c>] lookup_slow+0x19c/0x470 fs/namei.c:1650
 [<ffffffff815a14a6>] walk_component+0x716/0x1bb0 fs/namei.c:1784
 [<ffffffff815a3e06>] lookup_last fs/namei.c:2266 [inline]
 [<ffffffff815a3e06>] path_lookupat.isra.41+0x186/0x410 fs/namei.c:2283
 [<ffffffff815a98b7>] filename_lookup.part.55+0x177/0x370 fs/namei.c:2317
 [<ffffffff815a9c73>] filename_lookup fs/namei.c:2310 [inline]
 [<ffffffff815a9c73>] user_path_at_empty+0x53/0x70 fs/namei.c:2578
 [<ffffffff81580c56>] user_path_at include/linux/namei.h:55 [inline]
 [<ffffffff81580c56>] vfs_fstatat+0xc6/0x170 fs/stat.c:106
 [<ffffffff81581ef9>] vfs_lstat fs/stat.c:129 [inline]
 [<ffffffff81581ef9>] SYSC_newlstat+0x89/0x100 fs/stat.c:283
 [<ffffffff8158223d>] SyS_newlstat+0x1d/0x30 fs/stat.c:277
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839fbc13>] 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: [<ffffffff8136677c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136677c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81425e07>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by rs:main Q:Reg/3672:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d835c>] __fdget_pos+0xac/0xd0 fs/file.c:781
 #1:  (sb_writers#3){.+.+.+}, at: [<ffffffff81572e3e>] file_start_write include/linux/fs.h:2640 [inline]
 #1:  (sb_writers#3){.+.+.+}, at: [<ffffffff81572e3e>] vfs_write+0x3ae/0x530 fs/read_write.c:556
2 locks held by getty/3771:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f9db2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff82120212>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor3/9902:
 #0:  (&type->i_mutex_dir_key#5){.+.+.+}, at: [<ffffffff81594e21>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&type->i_mutex_dir_key#5){.+.+.+}, at: [<ffffffff81594e21>] lookup_slow+0x141/0x470 fs/namei.c:1645

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

NMI backtrace for cpu 0
CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.116-g0137ea2 #18
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8a87d08 ffffffff81eb46a9 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810b9bd0 ffff8801d8a87d40
 ffffffff81ebf9a7 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb46a9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb46a9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebf9a7>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebf93a>] 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
 [<ffffffff81366d14>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81366d14>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81366d14>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81366d14>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119d0ad>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839fbddc>] 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: 9916 Comm: syz-executor3 Not tainted 4.9.116-g0137ea2 #18
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff880197b08000 task.stack: ffff88019dc08000
RIP: 0010:[<ffffffff812433eb>] 
c [<ffffffff812433eb>] atomic_cmpxchg arch/x86/include/asm/atomic.h:186 [inline]
RIP: 0010:[<ffffffff812433eb>] 
c [<ffffffff812433eb>] queued_spin_lock include/asm-generic/qspinlock.h:100 [inline]
RIP: 0010:[<ffffffff812433eb>] 
c [<ffffffff812433eb>] do_raw_spin_lock+0xbb/0x1b0 kernel/locking/spinlock_debug.c:113
RSP: 0018:ffff88019dc0f348  EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff8801c0a990c8 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffff880197b08918 RDI: ffff8801c0a990cc
RBP: ffff88019dc0f368 R08: ffff880197b08938 R09: 0000000000000001
R10: ffff880197b08000 R11: 1ffff10032f61122 R12: ffff8801c0a990d0
R13: ffff8801c0a990d8 R14: ffff8801c0a990c8 R15: 0000000000000001
FS:  00007eff03257700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2038878000 CR3: 00000001cb596000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801c0a990c8
c 0000000000000296
c ffff88019dc0f498
c ffff8801c0a990c8
c
 ffff88019dc0f390
c ffffffff839fbb36
c ffffffff812215bb
c 1ffff10033b81e77
c
 ffff88019dc0f418
c ffff88019dc0f440
c ffffffff812215bb
c ffff88019dc0f3c8
c
Call Trace:
 [<ffffffff839fbb36>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:119 [inline]
 [<ffffffff839fbb36>] _raw_spin_lock_irqsave+0x56/0x62 kernel/locking/spinlock.c:159
 [<ffffffff812215bb>] prepare_to_wait_event+0x6b/0x450 kernel/sched/wait.c:213
 [<ffffffff81907a9e>] request_wait_answer+0x22e/0x6e0 fs/fuse/dev.c:459
 [<ffffffff819085a9>] __fuse_request_send+0x109/0x1b0 fs/fuse/dev.c:480
 [<ffffffff819086ad>] fuse_request_send+0x5d/0x70 fs/fuse/dev.c:493
 [<ffffffff81912904>] fuse_simple_request+0x2f4/0x660 fs/fuse/dev.c:551
 [<ffffffff8191aca3>] fuse_lookup_name+0x253/0x5d0 fs/fuse/dir.c:369
 [<ffffffff8191b10d>] fuse_lookup+0xed/0x3a0 fs/fuse/dir.c:406
 [<ffffffff81594f1e>] lookup_slow+0x23e/0x470 fs/namei.c:1668
 [<ffffffff815a14a6>] walk_component+0x716/0x1bb0 fs/namei.c:1784
 [<ffffffff815a3e06>] lookup_last fs/namei.c:2266 [inline]
 [<ffffffff815a3e06>] path_lookupat.isra.41+0x186/0x410 fs/namei.c:2283
 [<ffffffff815a98b7>] filename_lookup.part.55+0x177/0x370 fs/namei.c:2317
 [<ffffffff815a9c73>] filename_lookup fs/namei.c:2310 [inline]
 [<ffffffff815a9c73>] user_path_at_empty+0x53/0x70 fs/namei.c:2578
 [<ffffffff81580c56>] user_path_at include/linux/namei.h:55 [inline]
 [<ffffffff81580c56>] vfs_fstatat+0xc6/0x170 fs/stat.c:106
 [<ffffffff81581ef9>] vfs_lstat fs/stat.c:129 [inline]
 [<ffffffff81581ef9>] SYSC_newlstat+0x89/0x100 fs/stat.c:283
 [<ffffffff8158223d>] SyS_newlstat+0x1d/0x30 fs/stat.c:277
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839fbc13>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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c