device lo entered promiscuous mode
IPVS: stopping master sync thread 25616 ...
INFO: task syz-executor0:31209 blocked for more than 120 seconds.
      Not tainted 4.9.106-g8b94b87 #43
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D27272 31209  23562 0x00000004
 ffff8801b57ee000 ffff8801b97764c0 ffff8801b9776a00 ffff8801cec1e000
 ffff8801db321c18 ffff8801d4c7f290 ffffffff839e8c0d 0000000041b58ab3
 ffffffff843c21d0 ffffffff812366a0 0000000200000012 ffff8801db3224e8
Call Trace:
 [<ffffffff839ea20f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839f6621>] schedule_timeout+0x861/0xf70 kernel/time/timer.c:1768
 [<ffffffff839e83ea>] io_schedule_timeout+0x1ba/0x390 kernel/sched/core.c:5180
 [<ffffffff839eb659>] io_schedule include/linux/sched.h:460 [inline]
 [<ffffffff839eb659>] bit_wait_io+0x19/0xa0 kernel/sched/wait.c:582
 [<ffffffff839eaefe>] __wait_on_bit_lock+0xce/0x1c0 kernel/sched/wait.c:421
 [<ffffffff814349af>] __lock_page+0xff/0x160 mm/filemap.c:934
 [<ffffffff8143a779>] lock_page include/linux/pagemap.h:454 [inline]
 [<ffffffff8143a779>] pagecache_get_page+0x409/0x720 mm/filemap.c:1216
 [<ffffffff816256b9>] find_or_create_page include/linux/pagemap.h:309 [inline]
 [<ffffffff816256b9>] grow_dev_page fs/buffer.c:1005 [inline]
 [<ffffffff816256b9>] grow_buffers fs/buffer.c:1078 [inline]
 [<ffffffff816256b9>] __getblk_slow fs/buffer.c:1105 [inline]
 [<ffffffff816256b9>] __getblk_gfp+0x249/0x710 fs/buffer.c:1386
 [<ffffffff81629dd9>] __getblk include/linux/buffer_head.h:373 [inline]
 [<ffffffff81629dd9>] __breadahead+0x79/0xf0 fs/buffer.c:1396
 [<ffffffff8173b5fc>] sb_breadahead include/linux/buffer_head.h:312 [inline]
 [<ffffffff8173b5fc>] __ext4_get_inode_loc+0x9fc/0xf70 fs/ext4/inode.c:4404
 [<ffffffff81747467>] ext4_iget+0x1d7/0x3600 fs/ext4/inode.c:4551
 [<ffffffff817d6afe>] ext4_fill_super+0x659e/0xb260 fs/ext4/super.c:4088
 [<ffffffff8157c7e7>] mount_bdev+0x2c7/0x390 fs/super.c:1100
 [<ffffffff817ac784>] ext4_mount+0x34/0x40 fs/ext4/super.c:5558
 [<ffffffff8157e56c>] mount_fs+0x28c/0x370 fs/super.c:1206
 [<ffffffff815ddd31>] vfs_kern_mount.part.29+0xd1/0x3d0 fs/namespace.c:991
 [<ffffffff815e5659>] vfs_kern_mount fs/namespace.c:973 [inline]
 [<ffffffff815e5659>] do_new_mount fs/namespace.c:2513 [inline]
 [<ffffffff815e5659>] do_mount+0x3c9/0x2740 fs/namespace.c:2835
 [<ffffffff815e83ae>] SYSC_mount fs/namespace.c:3051 [inline]
 [<ffffffff815e83ae>] SyS_mount+0xfe/0x110 fs/namespace.c:3028
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9b13>] 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: [<ffffffff81366b6c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81366b6c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.?..}, at: [<ffffffff81426150>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/3678:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d844c>] __fdget_pos+0xac/0xd0 fs/file.c:781
2 locks held by getty/3774:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f7cb2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff821200c2>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133
1 lock held by syz-executor0/31209:
 #0:  (&type->s_umount_key#17/1){+.+.+.}, at: [<ffffffff8157bcb2>] alloc_super fs/super.c:241 [inline]
 #0:  (&type->s_umount_key#17/1){+.+.+.}, at: [<ffffffff8157bcb2>] sget_userns+0x552/0xba0 fs/super.c:503

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

NMI backtrace for cpu 1
CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.106-g8b94b87 #43
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8607d08 ffffffff81eb4209 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b96a0 ffff8801d8607d40
 ffffffff81ebf507 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb4209>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb4209>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebf507>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebf49a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b97a4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81367104>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81367104>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81367104>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81367104>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119d04d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f9cdc>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff839f8716