lowmemorykiller: Killing 'syz-executor.5' (2941) (tgid 2940), adj 1000,
   to free 136kB on behalf of 'syz-executor.0' (2953) because
   cache 264kB is below limit 65536kB for oom_score_adj 12
   Free memory is 20020kB above reserved
INFO: task init:2428 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 ffff88001a277718 29280  2428      1 0x00000000
 ffff88001a277718 ffff8800b454af80 0387e764a3caec6a ffff8800b454af80
 0000000000000000 ffff8800b454b800 ffff8801db61f180 ffff8801db61f1a8
 ffff8801db61e898 ffff8801d0df2f80 ffff8800b454af80 ffffed000344e001
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/2428:
 #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: 2947 Comm: syz-executor.5 Not tainted 4.4.174+ #4
task: ffff8801d6da4740 task.stack: ffff8801486b0000
RIP: 0010:[<ffffffff812065d5>]  [<ffffffff812065d5>] __lock_release kernel/locking/lockdep.c:3416 [inline]
RIP: 0010:[<ffffffff812065d5>]  [<ffffffff812065d5>] lock_release+0x375/0xcf0 kernel/locking/lockdep.c:3611
RSP: 0000:ffff8801486b7400  EFLAGS: 00000046
RAX: 0000000000000003 RBX: ffff8801d6da5058 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffffffff82ea73a0 RDI: 0000000000000000
RBP: ffff8801486b74b0 R08: 0000000000000003 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff8801d6da5030 R14: 0000000000000002 R15: ffff8801d6da507a
FS:  00007ff136b87700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000040d6d2 CR3: 00000001d061f000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000000 0000000000000000 ffff8801486b7490 0000000000000246
 0000000000000000 ffffffff813c28d2 ffff880100000000 0000000000000000
 ffff8801486b7480 ffff8801d6da5000 0000000300000000 ffff8801d6da5008
Call Trace:
 [<ffffffff813c293e>] rcu_lock_release include/linux/rcupdate.h:482 [inline]
 [<ffffffff813c293e>] rcu_read_unlock include/linux/rcupdate.h:917 [inline]
 [<ffffffff813c293e>] find_lock_task_mm+0x15e/0x280 mm/oom_kill.c:116
 [<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
 [<ffffffff813f7bef>] shrink_zones mm/vmscan.c:2603 [inline]
 [<ffffffff813f7bef>] do_try_to_free_pages mm/vmscan.c:2653 [inline]
 [<ffffffff813f7bef>] try_to_free_pages+0x66f/0x1260 mm/vmscan.c:2861
 [<ffffffff813d09af>] __perform_reclaim mm/page_alloc.c:2915 [inline]
 [<ffffffff813d09af>] __alloc_pages_direct_reclaim mm/page_alloc.c:2936 [inline]
 [<ffffffff813d09af>] __alloc_pages_slowpath mm/page_alloc.c:3201 [inline]
 [<ffffffff813d09af>] __alloc_pages_nodemask+0x8af/0x14b0 mm/page_alloc.c:3313
 [<ffffffff8145fa5b>] __alloc_pages include/linux/gfp.h:415 [inline]
 [<ffffffff8145fa5b>] __alloc_pages_node include/linux/gfp.h:428 [inline]
 [<ffffffff8145fa5b>] alloc_pages_node include/linux/gfp.h:442 [inline]
 [<ffffffff8145fa5b>] __vmalloc_area_node mm/vmalloc.c:1614 [inline]
 [<ffffffff8145fa5b>] __vmalloc_node_range+0x25b/0x650 mm/vmalloc.c:1672
 [<ffffffff8146031c>] __vmalloc_node mm/vmalloc.c:1716 [inline]
 [<ffffffff8146031c>] __vmalloc_node_flags mm/vmalloc.c:1730 [inline]
 [<ffffffff8146031c>] vmalloc+0x5c/0x70 mm/vmalloc.c:1745
 [<ffffffff8236de58>] xt_alloc_table_info+0xc8/0x100 net/netfilter/x_tables.c:999
 [<ffffffff8268dad5>] do_replace net/ipv6/netfilter/ip6_tables.c:1299 [inline]
 [<ffffffff8268dad5>] do_ip6t_set_ctl+0x225/0x450 net/ipv6/netfilter/ip6_tables.c:1863
 [<ffffffff822fcfad>] nf_sockopt net/netfilter/nf_sockopt.c:105 [inline]
 [<ffffffff822fcfad>] nf_setsockopt+0x6d/0xc0 net/netfilter/nf_sockopt.c:114
 [<ffffffff826003eb>] ipv6_setsockopt net/ipv6/ipv6_sockglue.c:909 [inline]
 [<ffffffff826003eb>] ipv6_setsockopt+0x10b/0x140 net/ipv6/ipv6_sockglue.c:893
 [<ffffffff823f782a>] tcp_setsockopt net/ipv4/tcp.c:2643 [inline]
 [<ffffffff823f782a>] tcp_setsockopt+0x8a/0xe0 net/ipv4/tcp.c:2637
 [<ffffffff821def2a>] sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:2663
 [<ffffffff821dcb59>] SYSC_setsockopt net/socket.c:1780 [inline]
 [<ffffffff821dcb59>] SyS_setsockopt+0x159/0x240 net/socket.c:1759
 [<ffffffff82718ba1>] entry_SYSCALL_64_fastpath+0x1e/0x9a
Code: df 4c 89 fa 48 c1 ea 03 0f b6 14 02 4c 89 f8 83 e0 07 83 c0 01 38 d0 7c 12 84 d2 74 0e 4c 89 ff 89 4d c0 e8 ae e8 27 00 8b 4d c0 <66> f7 43 22 f0 ff 74 3d 48 8d 7b 20 48 b8 00 00 00 00 00 fc ff 
NMI backtrace for cpu 1
CPU: 1 PID: 20 Comm: khungtaskd Not tainted 4.4.174+ #4
task: ffff8801da6c2f80 task.stack: ffff8800001e8000
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: 0000:ffff8800001efc88  EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fc300
RBP: ffff8800001efcb8 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: 0000000000458bd0 CR3: 0000000134906000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000001 ffffffff82e5f2e0 ffffffff831a6ac0 fffffbfff0634c34
 000000000001b6c0 0000000000000008 ffff8800001efcd8 ffffffff81092bee
 0000000000000008 ffffffff82924260 ffff8800001efd30 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