INFO: task syz-executor2:7268 blocked for more than 120 seconds.
      Not tainted 4.9.63-g44a3afc #92
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor2   D26480  7268   3524 0x00000004
 ffff8801d8589800 ffff8801cce04a80 ffff8801d80224c0 ffff8801d6c40000
 ffff8801db221418 ffff8801c8707580 ffffffff8389bf4b ffffffff8123d5a0
 ffffe8ffffc0e0c0 00ff8801d557d430 ffff8801db221d40 ffff8801db221d68
Call Trace:
 [<ffffffff8389d4ef>] schedule+0x7f/0x1b0 kernel/sched/core.c:3540
 [<ffffffff838a9723>] schedule_timeout+0x643/0x1220 kernel/time/timer.c:1770
 [<ffffffff8389b6fe>] io_schedule_timeout+0x1be/0x390 kernel/sched/core.c:5162
 [<ffffffff8389e969>] io_schedule include/linux/sched.h:460 [inline]
 [<ffffffff8389e969>] bit_wait_io+0x19/0xa0 kernel/sched/wait.c:582
 [<ffffffff8389e047>] __wait_on_bit+0x57/0x120 kernel/sched/wait.c:383
 [<ffffffff81433574>] wait_on_page_bit+0xf4/0x140 mm/filemap.c:802
 [<ffffffff8143f4f5>] wait_on_page_locked include/linux/pagemap.h:517 [inline]
 [<ffffffff8143f4f5>] __lock_page_or_retry+0x1e5/0x270 mm/filemap.c:975
 [<ffffffff8143ff6b>] lock_page_or_retry include/linux/pagemap.h:481 [inline]
 [<ffffffff8143ff6b>] filemap_fault+0x9eb/0x1110 mm/filemap.c:2141
 [<ffffffff814c48c7>] __do_fault+0x227/0x500 mm/memory.c:2827
 [<ffffffff814d0bed>] do_read_fault mm/memory.c:3154 [inline]
 [<ffffffff814d0bed>] do_fault mm/memory.c:3289 [inline]
 [<ffffffff814d0bed>] handle_pte_fault mm/memory.c:3490 [inline]
 [<ffffffff814d0bed>] __handle_mm_fault mm/memory.c:3577 [inline]
 [<ffffffff814d0bed>] handle_mm_fault+0x14fd/0x2530 mm/memory.c:3614
 [<ffffffff814c09da>] faultin_page mm/gup.c:386 [inline]
 [<ffffffff814c09da>] __get_user_pages+0x39a/0x1010 mm/gup.c:585
 [<ffffffff814c252a>] populate_vma_page_range+0x19a/0x230 mm/gup.c:1039
 [<ffffffff814c27cc>] __mm_populate+0x20c/0x360 mm/gup.c:1089
 [<ffffffff814993d8>] mm_populate include/linux/mm.h:2023 [inline]
 [<ffffffff814993d8>] vm_mmap_pgoff+0x198/0x1b0 mm/util.c:309
 [<ffffffff814e2daf>] SYSC_mmap_pgoff mm/mmap.c:1523 [inline]
 [<ffffffff814e2daf>] SyS_mmap_pgoff+0x33f/0x560 mm/mmap.c:1481
 [<ffffffff8105fc36>] SYSC_mmap arch/x86/kernel/sys_x86_64.c:95 [inline]
 [<ffffffff8105fc36>] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:86
 [<ffffffff838ad705>] entry_SYSCALL_64_fastpath+0x23/0xc6

Showing all locks held in the system:
2 locks held by khungtaskd/513:
 #0:  (rcu_read_lock){......}, at: [<ffffffff81373ed5>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff81373ed5>] watchdog+0x125/0xa70 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81239700>] debug_show_all_locks+0x70/0x280 kernel/locking/lockdep.c:4336
1 lock held by rsyslogd/3115:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d399f>] __fdget_pos+0x9f/0xc0 fs/file.c:781
2 locks held by getty/3203:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff838ab912>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff82005b24>] n_tty_read+0x1f4/0x16c0 drivers/tty/n_tty.c:2133

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

NMI backtrace for cpu 1
CPU: 1 PID: 513 Comm: khungtaskd Not tainted 4.9.63-g44a3afc #92
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8f37d00 ffffffff81d94429 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810bdb00 ffff8801d8f37d38
 ffffffff81d9f54d 0000000000000001 0000000000000000 ffff8801d8588418
Call Trace:
 [<ffffffff81d94429>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d94429>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81d9f54d>] nmi_cpu_backtrace+0xfd/0x120 lib/nmi_backtrace.c:99
 [<ffffffff81d9f687>] nmi_trigger_cpumask_backtrace+0x117/0x190 lib/nmi_backtrace.c:60
 [<ffffffff810bdbf4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff813744a0>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff813744a0>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff813744a0>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff813744a0>] watchdog+0x6f0/0xa70 kernel/hung_task.c:239
 [<ffffffff8119c5dd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff838ad9aa>] ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:433
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at pc 0xffffffff838ac386