netlink: 3 bytes leftover after parsing attributes in process `syz-executor2'.
INFO: task syz-executor7:16476 blocked for more than 120 seconds.
      Not tainted 4.9.108-gb7d377b #50
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor7   D29464 16476   3835 0x00000004
 ffff8801d8a9b000 0000000000000000 ffff8801b6184000 ffffffff84629800
 ffff8801db221c18 ffff880190ae7aa0 ffffffff839e8aed 1ffff1003215cf48
 ffffffff85542240 0000000041b58ab3 00ffffff843c23b8 ffff8801db2224e8
Call Trace:
 [<ffffffff839ea0ef>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839f6501>] schedule_timeout+0x861/0xf70 kernel/time/timer.c:1768
 [<ffffffff839e82ca>] io_schedule_timeout+0x1ba/0x390 kernel/sched/core.c:5180
 [<ffffffff839eba23>] do_wait_for_common kernel/sched/completion.c:75 [inline]
 [<ffffffff839eba23>] __wait_for_common kernel/sched/completion.c:93 [inline]
 [<ffffffff839eba23>] wait_for_common_io kernel/sched/completion.c:107 [inline]
 [<ffffffff839eba23>] wait_for_completion_io+0x203/0x2e0 kernel/sched/completion.c:155
 [<ffffffff81dfb622>] submit_bio_wait+0x112/0x180 block/bio.c:885
 [<ffffffff81e2dd72>] blkdev_issue_flush+0x152/0x220 block/blk-flush.c:518
 [<ffffffff8162f095>] blkdev_fsync+0x85/0xb0 fs/block_dev.c:378
 [<ffffffff8161a69c>] vfs_fsync_range+0x10c/0x260 fs/sync.c:195
 [<ffffffff8161a862>] vfs_fsync fs/sync.c:209 [inline]
 [<ffffffff8161a862>] do_fsync+0x42/0xb0 fs/sync.c:219
 [<ffffffff8161b009>] SYSC_fdatasync fs/sync.c:233 [inline]
 [<ffffffff8161b009>] SyS_fdatasync+0x19/0x20 fs/sync.c:231
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f99d3>] 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: [<ffffffff8136662c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136662c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81425cb7>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/3777:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f7b92>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff8211fce2>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133

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

NMI backtrace for cpu 0
CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.108-gb7d377b #50
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8b1fd08 ffffffff81eb3e29 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810b96a0 ffff8801d8b1fd40
 ffffffff81ebf127 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb3e29>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb3e29>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebf127>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebf0ba>] 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
 [<ffffffff81366bc4>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81366bc4>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81366bc4>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81366bc4>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119d04d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f9b9c>] 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 skipped: idling at pc 0xffffffff839f85f6