device lo entered promiscuous mode
device lo left promiscuous mode
INFO: task syz-executor0:13366 blocked for more than 140 seconds.
      Not tainted 4.9.124-g09eb2ba #31
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D28536 13366  10846 0x00000004
 ffff88019a394800 ffff8801d53bb9c0 ffff8801d53ba4c0 ffff88019923b000
 ffff8801db221c18 ffff88018e737ab8 ffffffff839f0afd ffff88018e737ad8
 ffff8801d63c5688 0000000000000000 0000000000000000 ffff8801db2224e8
Call Trace:
 [<ffffffff839f20ff>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff839fd738>] __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:526 [inline]
 [<ffffffff839fd738>] rwsem_down_write_failed+0x598/0x990 kernel/locking/rwsem-xadd.c:555
 [<ffffffff81eed907>] call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:105
 [<ffffffff8122e530>] __down_write arch/x86/include/asm/rwsem.h:125 [inline]
 [<ffffffff8122e530>] down_write_nested+0x60/0xa0 kernel/locking/rwsem.c:174
 [<ffffffff815ae7aa>] inode_lock_nested include/linux/fs.h:801 [inline]
 [<ffffffff815ae7aa>] filename_create+0x17a/0x490 fs/namei.c:3639
 [<ffffffff815b08dd>] user_path_create fs/namei.c:3697 [inline]
 [<ffffffff815b08dd>] SYSC_mknodat fs/namei.c:3764 [inline]
 [<ffffffff815b08dd>] SyS_mknodat fs/namei.c:3752 [inline]
 [<ffffffff815b08dd>] SYSC_mknod fs/namei.c:3798 [inline]
 [<ffffffff815b08dd>] SyS_mknod+0x18d/0x420 fs/namei.c:3796
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff83a019d3>] 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: [<ffffffff813689dc>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff813689dc>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81428248>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by rs:main Q:Reg/3664:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815dc7ec>] __fdget_pos+0xac/0xd0 fs/file.c:781
 #1:  (sb_writers#3){.+.+.+}, at: [<ffffffff8157745e>] file_start_write include/linux/fs.h:2640 [inline]
 #1:  (sb_writers#3){.+.+.+}, at: [<ffffffff8157745e>] vfs_write+0x3ae/0x530 fs/read_write.c:556
2 locks held by getty/3762:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839ffba2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff82125402>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
2 locks held by syz-executor0/13366:
 #0:  (sb_writers#19){.+.+.+}, at: [<ffffffff815e50cf>] sb_start_write include/linux/fs.h:1573 [inline]
 #0:  (sb_writers#19){.+.+.+}, at: [<ffffffff815e50cf>] mnt_want_write+0x3f/0xb0 fs/namespace.c:391
 #1:  (&sb->s_type->i_mutex_key#24/1){+.+.+.}, at: [<ffffffff815ae7aa>] inode_lock_nested include/linux/fs.h:801 [inline]
 #1:  (&sb->s_type->i_mutex_key#24/1){+.+.+.}, at: [<ffffffff815ae7aa>] filename_create+0x17a/0x490 fs/namei.c:3639

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

NMI backtrace for cpu 0
CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.124-g09eb2ba #31
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d89f7d08 ffffffff81eb95e9 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810b9fa0 ffff8801d89f7d40
 ffffffff81ec4927 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb95e9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb95e9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ec4927>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ec48ba>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810ba0a4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81368f74>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81368f74>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81368f74>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81368f74>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119f3cd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff83a01b9c>] 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: 13353 Comm: syz-executor0 Not tainted 4.9.124-g09eb2ba #31
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d0741800 task.stack: ffff880198f20000
RIP: 0010:[<ffffffff81232d65>] 
c [<ffffffff81232d65>] lock_is_held+0x105/0x140 kernel/locking/lockdep.c:3799
RSP: 0018:ffff880198f27600  EFLAGS: 00000246
RAX: 0000000000000007 RBX: ffffea00070c7100 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff846df4a0 RDI: 0000000000000246
RBP: ffff880198f27610 R08: ffff8801d0742160 R09: 0000000000000001
R10: ffff8801d0741800 R11: 1ffff1003a0e8427 R12: ffff8801d0741800
R13: 0000000000000001 R14: 0000000002420848 R15: ffff8801cbf70948
FS:  00007f3383fbd700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c42b23d000 CR3: 00000001d018d000 CR4: 00000000001606f0
Stack:
 ffff880191e308a8
c dffffc0000000000
c ffff880198f27620
c ffffffff8127e464
c
 ffff880198f27688
c ffffffff8143b3db
c ffffffff8143b090
c ffffffff816288d3
c
 ffff8801cbf70814
c 0000000000000008
c ffff8801cbf70950
c ffffea00070c7100
c
Call Trace:
 [<ffffffff8127e464>] rcu_read_lock_held+0xa4/0xc0 kernel/rcu/update.c:297
 [<ffffffff8143b3db>] radix_tree_deref_slot include/linux/radix-tree.h:199 [inline]
 [<ffffffff8143b3db>] find_get_entry+0x34b/0x540 mm/filemap.c:1095
 [<ffffffff8143c50b>] pagecache_get_page+0x4b/0x720 mm/filemap.c:1201
 [<ffffffff81629ba9>] find_or_create_page include/linux/pagemap.h:309 [inline]
 [<ffffffff81629ba9>] grow_dev_page fs/buffer.c:1005 [inline]
 [<ffffffff81629ba9>] grow_buffers fs/buffer.c:1078 [inline]
 [<ffffffff81629ba9>] __getblk_slow fs/buffer.c:1105 [inline]
 [<ffffffff81629ba9>] __getblk_gfp+0x249/0x710 fs/buffer.c:1386
 [<ffffffff8162d48d>] __bread_gfp+0x2d/0x270 fs/buffer.c:1420
 [<ffffffff818bc678>] sb_bread include/linux/buffer_head.h:300 [inline]
 [<ffffffff818bc678>] fat__get_entry+0x4c8/0x8f0 fs/fat/dir.c:100
 [<ffffffff818c4477>] fat_get_entry fs/fat/dir.c:128 [inline]
 [<ffffffff818c4477>] fat_search_long+0x277/0x1180 fs/fat/dir.c:477
 [<ffffffff818de9e4>] vfat_find+0x134/0x180 fs/fat/namei_vfat.c:708
 [<ffffffff818df1c1>] vfat_lookup+0xe1/0x530 fs/fat/namei_vfat.c:731
 [<ffffffff815985dc>] lookup_real fs/namei.c:1522 [inline]
 [<ffffffff815985dc>] __lookup_hash+0x11c/0x190 fs/namei.c:1542
 [<ffffffff815ae7d6>] filename_create+0x1a6/0x490 fs/namei.c:3640
 [<ffffffff815b08dd>] user_path_create fs/namei.c:3697 [inline]
 [<ffffffff815b08dd>] SYSC_mknodat fs/namei.c:3764 [inline]
 [<ffffffff815b08dd>] SyS_mknodat fs/namei.c:3752 [inline]
 [<ffffffff815b08dd>] SYSC_mknod fs/namei.c:3798 [inline]
 [<ffffffff815b08dd>] SyS_mknod+0x18d/0x420 fs/namei.c:3796
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff83a019d3>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
cb6 
c14 
c02 
c48 
c89 
cf8 
c83 
ce0 
c07 
c83 
cc0 
c03 
c38 
cd0 
c7c 
c04 
c84 
cd2 
c75 
c3a 
c41 
cc7 
c84 
c24 
cc4 
c08 
c00 
c00 
c00 
c00 
c00 
c00 
c48 
c89 
cdf 
c57 
c9d 
c0f 
c1f 
c44 
c00 
c00 
c5b 
c<44> 
c89 
ce8 
c41 
c5c 
c41 
c5d 
c5d 
cc3 
c41 
cbd 
c01 
c00 
c00 
c00 
c5b 
c44 
c89 
ce8 
c41 
c5c 
c