Free swap  = 0kB
Total swap = 0kB
1965969 pages RAM
0 pages HighMem/MovableOnly
321064 pages reserved
INFO: task init:4044 blocked for more than 120 seconds.
      Not tainted 4.9.98-g9731a2d #22
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
init            D
29000  4044      1 0x00000000
 ffff8801d48b9500 ffff8801d48b8540 ffff8801d4fb4800 ffff8801db221b98
 ffff8801d5da7570 ffffffff839e377d 0000000000000000 ffff8801d4fb08ea
 ffff8801d5da76d0 0000000000000046 ffff8801db222468Call Trace:
 [<ffffffff839e4d7f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839f1191>] schedule_timeout+0x861/0xf70 kernel/time/timer.c:1768
 [<ffffffff839ed8ae>] __down_common kernel/locking/semaphore.c:221 [inline]
 [<ffffffff839ed8ae>] __down+0x12e/0x1f0 kernel/locking/semaphore.c:238
 [<ffffffff81229f1e>] down+0x5e/0x80 kernel/locking/semaphore.c:61
 [<ffffffff812587dc>] console_lock+0x2c/0x80 kernel/printk/printk.c:2212
 [<ffffffff8125e04c>] console_device+0x1c/0xc0 kernel/printk/printk.c:2549
 [<ffffffff82116f6a>] tty_lookup_driver drivers/tty/tty_io.c:2003 [inline]
 [<ffffffff82116f6a>] tty_open_by_driver drivers/tty/tty_io.c:2048 [inline]
 [<ffffffff82116f6a>] tty_open+0x71a/0xe20 drivers/tty/tty_io.c:2125
 [<ffffffff8157c55d>] chrdev_open+0x22d/0x4c0 fs/char_dev.c:392
 [<ffffffff81567443>] do_dentry_open+0x703/0xc80 fs/open.c:766
 [<ffffffff8156ac2c>] vfs_open+0x11c/0x210 fs/open.c:879
 [<ffffffff815a1d68>] do_last fs/namei.c:3410 [inline]
 [<ffffffff815a1d68>] path_openat+0x758/0x3590 fs/namei.c:3534
 [<ffffffff815a8e67>] do_filp_open+0x197/0x270 fs/namei.c:3568
 [<ffffffff8156b63d>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
 [<ffffffff8156b91d>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff8156b91d>] SyS_open+0x2d/0x40 fs/open.c:1085
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f4653>] 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: [<ffffffff813646ec>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 (rcu_read_lock){......}, at: [<ffffffff813646ec>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 (tasklist_lock){.+.+..}, at: [<ffffffff81423ba0>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
 #0: 
 (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d565c>] __fdget_pos+0xac/0xd0 fs/file.c:781
 #0: 
 (&tty->ldisc_sem){++++++}, at: [<ffffffff839f2822>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff8211cc12>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133
 #0: 
 (tty_mutex){+.+.+.}, at: [<ffffffff82116cbc>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 (tty_mutex){+.+.+.}, at: [<ffffffff82116cbc>] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125
 #0: 
 (tty_mutex){+.+.+.}, at: [<ffffffff82116cbc>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 (tty_mutex){+.+.+.}, at: [<ffffffff82116cbc>] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125
 #0: 
 (tty_mutex){+.+.+.}, at: [<ffffffff82116cbc>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 (tty_mutex){+.+.+.}, at: [<ffffffff82116cbc>] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125
 #0: 
 (tty_mutex){+.+.+.}, at: [<ffffffff82116cbc>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 (tty_mutex){+.+.+.}, at: [<ffffffff82116cbc>] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125
 #0: 
 (tty_mutex){+.+.+.}, at: [<ffffffff82116cbc>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 (tty_mutex){+.+.+.}, at: [<ffffffff82116cbc>] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125
 #0: 
 (tty_mutex){+.+.+.}, at: [<ffffffff82116cbc>] tty_open_by_driver drivers/tty/tty_io.c:2047 [inline]
 (tty_mutex){+.+.+.}, at: [<ffffffff82116cbc>] tty_open+0x46c/0xe20 drivers/tty/tty_io.c:2125
=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.98-g9731a2d #22
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8b17d08
 ffffffff81eb0ee9 0000000000000000 0000000000000001 0000000000000001
 0000000000000001 ffffffff810b7da0 ffff8801d8b17d40 ffffffff81ebc1e7
 0000000000000001 0000000000000000 0000000000000003Call Trace:
 [<ffffffff81eb0ee9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb0ee9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebc1e7>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebc17a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b7ea4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81364c84>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81364c84>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81364c84>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81364c84>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119ad5d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f481c>] 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
CPU: 0 PID: 6908 Comm: syz-executor376 Not tainted 4.9.98-g9731a2d #22
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801cde1c800 task.stack: ffff8801c0950000
RIP: 0010:[<ffffffff81ee4fa9>] 
c [<ffffffff81ee4fa9>] memset_erms+0x9/0x10 arch/x86/lib/memset_64.S:64
RSP: 0018:ffff8801c09576f8  EFLAGS: 00010206
RAX: dffffc00000000ff RBX: 00000000001bcc00 RCX: 000000000001c880
RDX: 0000000000040000 RSI: 00000000000000ff RDI: ffffed00379a3780
RBP: ffff8801c0957700 R08: 1ffff10037980000 R09: ffffed0037980000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000009
R13: ffff8801bcc00000 R14: 0000000000000000 R15: ffffea0006f30000
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020200000 CR3: 000000000461e000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff815388c9
c ffff8801c0957790
c ffffffff8144825c
c 0000000000000046
c
 0000000000000000
c ffff8801cde1d0c0
c ffff8801cde1d0c0
c ffff8801cde1c800
c
 ffffffff839f3d7a
c 0000000000000286
c 0000000000000000
c ffff8801c0957c48
c
Call Trace:
 [<ffffffff8144825c>] free_pages_prepare mm/page_alloc.c:1067 [inline]
 [<ffffffff8144825c>] __free_pages_ok+0x1ec/0x1610 mm/page_alloc.c:1263
 [<ffffffff814496de>] free_compound_page+0x5e/0x70 mm/page_alloc.c:594
 [<ffffffff8154f409>] free_transhuge_page+0x99/0xc0 mm/huge_memory.c:2228
 [<ffffffff81461a40>] __put_compound_page+0x80/0xc0 mm/swap.c:94
 [<ffffffff81463634>] release_pages+0x2f4/0x970 mm/swap.c:763
 [<ffffffff81506437>] free_pages_and_swap_cache+0x117/0x160 mm/swap_state.c:273
 [<ffffffff814bdbf4>] tlb_flush_mmu_free+0xb4/0x150 mm/memory.c:259
 [<ffffffff814c146d>] tlb_flush_mmu+0x1d/0x20 mm/memory.c:268
 [<ffffffff81546ce4>] tlb_remove_page_size include/asm-generic/tlb.h:154 [inline]
 [<ffffffff81546ce4>] tlb_remove_page include/asm-generic/tlb.h:172 [inline]
 [<ffffffff81546ce4>] zap_huge_pmd+0x404/0x860 mm/huge_memory.c:1424
 [<ffffffff814c628f>] zap_pmd_range mm/memory.c:1245 [inline]
 [<ffffffff814c628f>] zap_pud_range mm/memory.c:1279 [inline]
 [<ffffffff814c628f>] unmap_page_range+0x12af/0x1730 mm/memory.c:1300
 [<ffffffff814c6811>] unmap_single_vma+0x101/0x260 mm/memory.c:1345
 [<ffffffff814c7152>] unmap_vmas+0x102/0x1d0 mm/memory.c:1375
 [<ffffffff814df8b4>] exit_mmap+0x214/0x3f0 mm/mmap.c:2988
 [<ffffffff81129dd3>] __mmput kernel/fork.c:878 [inline]
 [<ffffffff81129dd3>] mmput+0xf3/0x2d0 kernel/fork.c:900
 [<ffffffff8113ebb6>] exit_mm kernel/exit.c:518 [inline]
 [<ffffffff8113ebb6>] do_exit+0x906/0x27c0 kernel/exit.c:824
 [<ffffffff81144d91>] do_group_exit+0x111/0x340 kernel/exit.c:941
 [<ffffffff81144fdd>] SYSC_exit_group kernel/exit.c:952 [inline]
 [<ffffffff81144fdd>] SyS_exit_group+0x1d/0x20 kernel/exit.c:950
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f4653>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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c<f3> 
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c