Free memory is 38864kB above reserved
lowmemorykiller: Killing 'syz-executor.0' (4665) (tgid 4665), adj 1000,
   to free 35912kB on behalf of 'kswapd0' (28) because
   cache 13444kB is below limit 65536kB for oom_score_adj 12
   Free memory is 38396kB above reserved
INFO: task init:13618 blocked for more than 140 seconds.
      Not tainted 4.4.174+ #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
init            D ffff880046f17718 29280 13618      1 0x00000000
 ffff880046f17718 ffff8800a6ea8000 243cc474a07d423c ffff8800a6ea8000
 0000000000000000 ffff8800a6ea8800 ffff8801db61f180 ffff8801db61f1a8
 ffff8801db61e898 ffff8801018d5f00 ffff8800a6ea8000 ffffed0008de2001
Call Trace:
 [<ffffffff82709b79>] schedule+0x99/0x1d0 kernel/sched/core.c:3355
 [<ffffffff8270a333>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3388
 [<ffffffff8270c492>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff8270c492>] mutex_lock_nested+0x3c2/0xb80 kernel/locking/mutex.c:621
 [<ffffffff81c8b2aa>] tty_open+0x56a/0xf50 drivers/tty/tty_io.c:2067
 [<ffffffff814a3ec0>] chrdev_open+0x230/0x630 fs/char_dev.c:388
 [<ffffffff8149154f>] do_dentry_open+0x38f/0xbd0 fs/open.c:749
 [<ffffffff81494d3b>] vfs_open+0x10b/0x210 fs/open.c:862
 [<ffffffff814c5ddf>] do_last fs/namei.c:3269 [inline]
 [<ffffffff814c5ddf>] path_openat+0x136f/0x4470 fs/namei.c:3406
 [<ffffffff814ccab1>] do_filp_open+0x1a1/0x270 fs/namei.c:3440
 [<ffffffff81495668>] do_sys_open+0x2f8/0x600 fs/open.c:1038
 [<ffffffff8149599d>] SYSC_open fs/open.c:1056 [inline]
 [<ffffffff8149599d>] SyS_open+0x2d/0x40 fs/open.c:1051
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
1 lock held by init/13618:
 #0:  (tty_mutex){+.+.+.}, at: [<ffffffff81c8b2aa>] tty_open+0x56a/0xf50 drivers/tty/tty_io.c:2067
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: kswapd0 Not tainted 4.4.174+ #4
task: ffff8800001f4740 task.stack: ffff8800bba68000
RIP: 0010:[<ffffffff8115d39b>]  [<ffffffff8115d39b>] preempt_count_add+0x6b/0x1d0 kernel/sched/core.c:3077
RSP: 0018:ffff8800bba6f818  EFLAGS: 00000282
RAX: dffffc0000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: 1ffffffff08000d0 RSI: ffffffff813c28c2 RDI: 0000000000000001
RBP: ffff8800bba6f828 R08: 0000000000000002 R09: ffff8800001f5078
R10: ffffffff82836880 R11: 0000000000000000 R12: 0000000000000001
R13: dffffc0000000000 R14: ffff88000cce9f18 R15: ffff88000cce9f98
FS:  0000000000000000(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe852c48000 CR3: 00000000a7fb3000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff88000cce97c0 ffff88000cce9f98 ffff8800bba6f848 ffffffff82717c77
 ffff8800bba6f848 ffff88000cce97c0 ffff8800bba6f898 ffffffff813c28d2
 ffffffff813c27e0 ffff88012212e6d8 ffffed000199d3e3 ffff88000cce9c00
Call Trace:
 [<ffffffff82717c77>] __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline]
 [<ffffffff82717c77>] _raw_spin_lock+0x17/0x50 kernel/locking/spinlock.c:151
 [<ffffffff813c28d2>] spin_lock include/linux/spinlock.h:302 [inline]
 [<ffffffff813c28d2>] task_lock include/linux/sched.h:2969 [inline]
 [<ffffffff813c28d2>] find_lock_task_mm+0xf2/0x280 mm/oom_kill.c:109
 [<ffffffff8211e7cb>] lowmem_scan+0x45b/0xbf0 drivers/staging/android/lowmemorykiller.c:132
 [<ffffffff813ee8e2>] do_shrink_slab mm/vmscan.c:357 [inline]
 [<ffffffff813ee8e2>] shrink_slab.part.0+0x402/0xb30 mm/vmscan.c:455
 [<ffffffff813f742c>] shrink_slab mm/vmscan.c:425 [inline]
 [<ffffffff813f742c>] shrink_zone+0x4bc/0x610 mm/vmscan.c:2448
 [<ffffffff813f928f>] kswapd_shrink_zone mm/vmscan.c:3123 [inline]
 [<ffffffff813f928f>] balance_pgdat mm/vmscan.c:3298 [inline]
 [<ffffffff813f928f>] kswapd+0xaaf/0x1c60 mm/vmscan.c:3506
 [<ffffffff811342c3>] kthread+0x273/0x310 kernel/kthread.c:211
 [<ffffffff82718fc5>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:537
Code: 02 85 c9 75 07 65 8b 05 94 93 eb 7e 48 b8 00 00 00 00 00 fc ff df 48 89 da 83 e3 07 48 c1 ea 03 83 c3 03 65 44 01 25 75 93 eb 7e <0f> b6 04 02 38 c3 7c 08 84 c0 0f 85 12 01 00 00 8b 15 cf 32 ea 
NMI backtrace for cpu 1
CPU: 1 PID: 20 Comm: khungtaskd Not tainted 4.4.174+ #4
task: ffff8801da6f2f80 task.stack: ffff8801d9ef0000
RIP: 0010:[<ffffffff8109b617>]  [<ffffffff8109b617>] _flat_send_IPI_mask arch/x86/kernel/apic/apic_flat_64.c:62 [inline]
RIP: 0010:[<ffffffff8109b617>]  [<ffffffff8109b617>] flat_send_IPI_mask+0xf7/0x1b0 arch/x86/kernel/apic/apic_flat_64.c:69
RSP: 0018:ffff8801d9ef7c88  EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fc300
RBP: ffff8801d9ef7cb8 R08: 0000000000000018 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000246
R13: 0000000003000000 R14: ffffffff82e5f2e0 R15: 0000000000000002
FS:  0000000000000000(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000014daf80 CR3: 00000000b40f8000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000001 ffffffff82e5f2e0 ffffffff831a6ac0 fffffbfff0634c34
 000000000001b6c0 0000000000000008 ffff8801d9ef7cd8 ffffffff81092bee
 0000000000000008 ffffffff82924260 ffff8801d9ef7d30 ffffffff81ab8252
Call Trace:
 [<ffffffff81092bee>] nmi_raise_cpu_backtrace+0x5e/0x80 arch/x86/kernel/apic/hw_nmi.c:33
 [<ffffffff81ab8252>] nmi_trigger_all_cpu_backtrace.cold+0xa1/0xae lib/nmi_backtrace.c:85
 [<ffffffff81092ca4>] arch_trigger_all_cpu_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 [<ffffffff813b4762>] trigger_all_cpu_backtrace include/linux/nmi.h:44 [inline]
 [<ffffffff813b4762>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff813b4762>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff813b4762>] watchdog.cold+0xd3/0xee kernel/hung_task.c:238
 [<ffffffff811342c3>] kthread+0x273/0x310 kernel/kthread.c:211
 [<ffffffff82718fc5>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:537
Code: 00 c3 5f ff 80 e6 10 75 e1 41 c1 e5 18 44 89 2c 25 10 c3 5f ff 44 89 fa 09 da 80 cf 04 41 83 ff 02 0f 44 d3 89 14 25 00 c3 5f ff <41> f7 c4 00 02 00 00 75 1e 4c 89 e7 57 9d 0f 1f 44 00 00 e8 f1