audit: type=1400 audit(1586539515.724:942): avc:  denied  { write } for  pid=10496 comm="syz-executor.3" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1
INFO: task syz-executor.1:2126 blocked for more than 140 seconds.
      Not tainted 4.9.155+ #27
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1  D25528  2126      1 0x00000004
 ffff8801ce2d17c0 ffff8801ce5fd800 ffff8801db621000 ffff8801ce2d0000
 ffff8801db621018 ffff8801a8d67598 ffffffff82806806 f0c0283ee572ee96
 0000000000000001 ffff8801ce2d2070 0000000000000006 ffff8801db6218f0
Call Trace:
 [<ffffffff82807d92>] schedule+0x92/0x1c0 kernel/sched/core.c:3553
 [<ffffffff82808733>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3586
 [<ffffffff8280a68d>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff8280a68d>] mutex_lock_nested+0x38d/0x920 kernel/locking/mutex.c:621
 [<ffffffff818928ad>] fuse_lock_inode+0xad/0xe0 fs/fuse/inode.c:364
 [<ffffffff81873bb9>] fuse_lookup+0x89/0x3b0 fs/fuse/dir.c:406
 [<ffffffff8152c99b>] lookup_slow+0x24b/0x480 fs/namei.c:1709
 [<ffffffff8153bc0e>] walk_component+0x71e/0xce0 fs/namei.c:1825
 [<ffffffff8153ca67>] link_path_walk+0x897/0x1200 fs/namei.c:2161
 [<ffffffff8153d977>] path_mountpoint+0x67/0x6d0 fs/namei.c:2737
 [<ffffffff8154238f>] filename_mountpoint+0x17f/0x350 fs/namei.c:2758
 [<ffffffff81543a8a>] user_path_mountpoint_at+0x3a/0x50 fs/namei.c:2788
 [<ffffffff81579bd6>] SYSC_umount fs/namespace.c:1722 [inline]
 [<ffffffff81579bd6>] SyS_umount+0x136/0xd30 fs/namespace.c:1706
 [<ffffffff810056bd>] do_syscall_64+0x1ad/0x570 arch/x86/entry/common.c:285
 [<ffffffff82816a93>] 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: [<ffffffff8131bbab>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131bbab>] watchdog+0x11b/0xa40 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff813fea8f>] debug_show_all_locks+0x7f/0x21f kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/1904:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff8156f2f8>] __fdget_pos+0xa8/0xd0 fs/file.c:781
2 locks held by getty/2032:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff82814b83>] ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:377
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff81d3982e>] n_tty_read+0x1fe/0x1820 drivers/tty/n_tty.c:2156
2 locks held by syz-executor.1/2126:
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8152c8b0>] inode_lock_shared include/linux/fs.h:778 [inline]
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8152c8b0>] lookup_slow+0x160/0x480 fs/namei.c:1686
 #1:  (&fi->mutex){+.+.+.}, at: [<ffffffff818928ad>] fuse_lock_inode+0xad/0xe0 fs/fuse/inode.c:364
2 locks held by syz-executor.1/10431:
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8152c8b0>] inode_lock_shared include/linux/fs.h:778 [inline]
 #0:  (&type->i_mutex_dir_key#7){++++++}, at: [<ffffffff8152c8b0>] lookup_slow+0x160/0x480 fs/namei.c:1686
 #1:  (&fi->mutex){+.+.+.}, at: [<ffffffff818928ad>] fuse_lock_inode+0xad/0xe0 fs/fuse/inode.c:364

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

NMI backtrace for cpu 0
CPU: 0 PID: 24 Comm: khungtaskd Not tainted 4.9.155+ #27
 ffff8801d9907cd0 ffffffff81b47871 0000000000000000 0000000000000000
 0000000000000000 ffffffff81097301 00000000003fff9d ffff8801d9907d08
 ffffffff81b52afc 0000000000000000 0000000000000000 0000000000000000
Call Trace:
 [<ffffffff81b47871>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b47871>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<ffffffff81b52afc>] nmi_cpu_backtrace.cold+0x47/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81b52a84>] nmi_trigger_cpumask_backtrace+0x124/0x155 lib/nmi_backtrace.c:60
 [<ffffffff81097494>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff8131c087>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8131c087>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8131c087>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8131c087>] watchdog+0x5f7/0xa40 kernel/hung_task.c:239
 [<ffffffff81142028>] kthread+0x278/0x310 kernel/kthread.c:211
 [<ffffffff82816c5c>] 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: 10554 Comm: init Not tainted 4.9.155+ #27
task: ffff8801c8a3c740 task.stack: ffff8801a5d10000
RIP: 0010:[<ffffffff81d64f5b>] 
c [<ffffffff81d64f5b>] io_serial_in+0x6b/0x90 drivers/tty/serial/8250/8250_port.c:414
RSP: 0018:ffff8801a5d17570  EFLAGS: 00000002
RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: ffffffff81d64f01 RDI: ffffffff84b63b58
RBP: ffff8801a5d17580 R08: 0000000000000001 R09: 1ffffffff078e8b1
R10: ffffed0034ba2e6e R11: 0000000000000001 R12: ffffffff84b63b20
R13: 0000000000000020 R14: fffffbfff096c7ab R15: fffffbfff096c76d
FS:  00007fabb73c17a0(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fabb6ad4a30 CR3: 00000001c63b2000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff84b63b20
c 0000000000002710
c ffff8801a5d175d0
c ffffffff81d671a4
c
 ffff8801a5d17608
c ffffffff84b63b68
c ffffffff84b63d5a
c ffffffff841d22c7
c
 ffffffff84b63b20
c 000000000000002e
c dffffc0000000000
c 000000000000002e
c
Call Trace:
 [<ffffffff81d671a4>] serial_in drivers/tty/serial/8250/8250.h:111 [inline]
 [<ffffffff81d671a4>] wait_for_xmitr+0x94/0x1e0 drivers/tty/serial/8250/8250_port.c:1997
 [<ffffffff81d67310>] serial8250_console_putchar+0x20/0x60 drivers/tty/serial/8250/8250_port.c:3103
 [<ffffffff81d4f646>] uart_console_write+0x56/0xe0 drivers/tty/serial/serial_core.c:1880
 [<ffffffff81d725cb>] serial8250_console_write+0x2fb/0x860 drivers/tty/serial/8250/8250_port.c:3169
 [<ffffffff81d6003f>] univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:594
 [<ffffffff81222bac>] call_console_drivers.isra.0.constprop.0+0x1ac/0x360 kernel/printk/printk.c:1594
 [<ffffffff8122628c>] console_unlock+0x47c/0xb20 kernel/printk/printk.c:2454
 [<ffffffff812275a7>] console_device+0x97/0xc0 kernel/printk/printk.c:2562
 [<ffffffff81d2e0e6>] tty_lookup_driver drivers/tty/tty_io.c:2016 [inline]
 [<ffffffff81d2e0e6>] tty_open_by_driver drivers/tty/tty_io.c:2061 [inline]
 [<ffffffff81d2e0e6>] tty_open+0x796/0xe10 drivers/tty/tty_io.c:2138
 [<ffffffff81519c40>] chrdev_open+0x230/0x630 fs/char_dev.c:392
 [<ffffffff81503cff>] do_dentry_open+0x3ef/0xc80 fs/open.c:766
 [<ffffffff81507695>] vfs_open+0x105/0x230 fs/open.c:879
 [<ffffffff8153ebd5>] do_last fs/namei.c:3457 [inline]
 [<ffffffff8153ebd5>] path_openat+0xbf5/0x2f60 fs/namei.c:3581
 [<ffffffff81543d21>] do_filp_open+0x1a1/0x280 fs/namei.c:3615
 [<ffffffff815080c0>] do_sys_open+0x2f0/0x610 fs/open.c:1072
 [<ffffffff8150840d>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff8150840d>] SyS_open+0x2d/0x40 fs/open.c:1085
 [<ffffffff810056bd>] do_syscall_64+0x1ad/0x570 arch/x86/entry/common.c:285
 [<ffffffff82816a93>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
c24 
cc9 
c00 
c00 
c00 
c49 
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c7c 
c24 
c38 
c48 
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c00 
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c00 
c00 
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c48 
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cc1 
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c80 
c3c 
c02 
c00 
c75 
c17 
c41 
c03 
c5c 
c24 
c38 
c89 
cda 
cec 
c<5b> 
c0f 
cb6 
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c41 
c5c 
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cc3 
ce8 
c98 
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c78 
cff 
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cc2 
ce8 
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c78 
cff 
ceb 
c