SELinux: unrecognized netlink message: protocol=9 nlmsg_type=65110 sclass=netlink_audit_socket pig=12894 comm=syz-executor2
SELinux: unrecognized netlink message: protocol=9 nlmsg_type=2024 sclass=netlink_audit_socket pig=12894 comm=syz-executor2
SELinux: unrecognized netlink message: protocol=9 nlmsg_type=9300 sclass=netlink_audit_socket pig=12894 comm=syz-executor2
INFO: task syz-executor0:12881 blocked for more than 140 seconds.
      Not tainted 4.9.117-g8b21e85 #19
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D27056 12881  11495 0x10000004
 ffff8801b0f96000 ffff8801d8652f40 ffff8801c9bd9f80 ffff8801bf2de000
 ffff8801db221c18 ffff8801aa23f4a8 ffffffff839ebd0d 0000000000000000
 ffff8801b0f968f0 0000000000000282 00ff8801b0f968c0 ffff8801db2224e8
Call Trace:
 [<ffffffff839ed30f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff815c8102>] d_wait_lookup fs/dcache.c:2455 [inline]
 [<ffffffff815c8102>] d_alloc_parallel+0xeb2/0x17c0 fs/dcache.c:2537
 [<ffffffff815950bc>] lookup_slow+0x19c/0x470 fs/namei.c:1650
 [<ffffffff815a16e6>] walk_component+0x716/0x1bb0 fs/namei.c:1784
 [<ffffffff815a3409>] link_path_walk+0x889/0x1200 fs/namei.c:2120
 [<ffffffff815a447d>] path_openat+0x1ad/0x3590 fs/namei.c:3533
 [<ffffffff815abb27>] do_filp_open+0x197/0x270 fs/namei.c:3568
 [<ffffffff8156e2fd>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
 [<ffffffff8156e620>] SYSC_openat fs/open.c:1099 [inline]
 [<ffffffff8156e620>] SyS_openat+0x30/0x40 fs/open.c:1093
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839fcc13>] 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: [<ffffffff813667fc>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff813667fc>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81426017>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by rs:main Q:Reg/3622:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d859c>] __fdget_pos+0xac/0xd0 fs/file.c:781
 #1:  (sb_writers#3){.+.+.+}, at: [<ffffffff8157307e>] file_start_write include/linux/fs.h:2640 [inline]
 #1:  (sb_writers#3){.+.+.+}, at: [<ffffffff8157307e>] vfs_write+0x3ae/0x530 fs/read_write.c:556
1 lock held by rsyslogd/3624:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d859c>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/3720:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839fadb2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff821207f2>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor0/12881:
 #0:  (&sb->s_type->i_mutex_key#19){++++++}, at: [<ffffffff81595061>] inode_lock_shared include/linux/fs.h:776 [inline]
 #0:  (&sb->s_type->i_mutex_key#19){++++++}, at: [<ffffffff81595061>] lookup_slow+0x141/0x470 fs/namei.c:1645

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

NMI backtrace for cpu 0
CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.117-g8b21e85 #19
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d86bfd08 ffffffff81eb4be9 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810b9bd0 ffff8801d86bfd40
 ffffffff81ebfee7 0000000000000000 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
 [<ffffffff81366d94>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81366d94>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81366d94>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81366d94>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119d0ed>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839fcddc>] 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: 12873 Comm: syz-executor0 Not tainted 4.9.117-g8b21e85 #19
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801b0f91800 task.stack: ffff88019dc58000
RIP: 0010:[<ffffffff8135eb4b>] 
c [<ffffffff8135eb4b>] __read_once_size include/linux/compiler.h:243 [inline]
RIP: 0010:[<ffffffff8135eb4b>] 
c [<ffffffff8135eb4b>] __sanitizer_cov_trace_pc+0x3b/0x50 kernel/kcov.c:105
RSP: 0018:ffff88019dc5f098  EFLAGS: 00000246
RAX: 0000000000040000 RBX: 0000000000000002 RCX: ffffc90008b02000
RDX: 000000000003ffff RSI: ffffffff81625765 RDI: 0000000000000246
RBP: ffff88019dc5f098 R08: ffff8801b0f92138 R09: 0000000000000001
R10: 0000000000000000 R11: 1ffff100361f2422 R12: ffffea000663dedc
R13: ffffea000663dec0 R14: 0000000000000200 R15: dffffc0000000000
FS:  00007fce0a945700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c4293a1000 CR3: 00000001cc95e000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff88019dc5f138
c ffffffff81625765
c ffff88019dc5f108
c ffff8801d9c15088
c
 ffff88019dc5f140
c ffffed003b382a11
c ffff8801cbe4a69f
c ffff8801d9c15240
c
 ffffea000663dee0
c 0000000000000008
c ffff8801d9c15210
c 0000000800000000
c
Call Trace:
 [<ffffffff81625765>] grow_buffers fs/buffer.c:1060 [inline]
 [<ffffffff81625765>] __getblk_slow fs/buffer.c:1105 [inline]
 [<ffffffff81625765>] __getblk_gfp+0x1a5/0x710 fs/buffer.c:1386
 [<ffffffff816290ed>] __bread_gfp+0x2d/0x270 fs/buffer.c:1420
 [<ffffffff818b7908>] sb_bread include/linux/buffer_head.h:300 [inline]
 [<ffffffff818b7908>] fat__get_entry+0x4c8/0x8f0 fs/fat/dir.c:100
 [<ffffffff818bf707>] fat_get_entry fs/fat/dir.c:128 [inline]
 [<ffffffff818bf707>] fat_search_long+0x277/0x1180 fs/fat/dir.c:477
 [<ffffffff818d9c74>] vfat_find+0x134/0x180 fs/fat/namei_vfat.c:708
 [<ffffffff818da451>] vfat_lookup+0xe1/0x530 fs/fat/namei_vfat.c:731
 [<ffffffff8159515e>] lookup_slow+0x23e/0x470 fs/namei.c:1668
 [<ffffffff815a16e6>] walk_component+0x716/0x1bb0 fs/namei.c:1784
 [<ffffffff815a3409>] link_path_walk+0x889/0x1200 fs/namei.c:2120
 [<ffffffff815a447d>] path_openat+0x1ad/0x3590 fs/namei.c:3533
 [<ffffffff815abb27>] do_filp_open+0x197/0x270 fs/namei.c:3568
 [<ffffffff8156e2fd>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
 [<ffffffff8156e620>] SYSC_openat fs/open.c:1099 [inline]
 [<ffffffff8156e620>] SyS_openat+0x30/0x40 fs/open.c:1093
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839fcc13>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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c