Free memory is -1240kB above reserved
lowmemorykiller: Killing 'syz-executor.4' (27031) (tgid 27016), adj 1000,
   to free 51380kB on behalf of 'syz-fuzzer' (2071) because
   cache 188kB is below limit 6144kB for oom_score_adj 0
   Free memory is -1240kB above reserved
INFO: task syz-executor.5:2115 blocked for more than 140 seconds.
      Not tainted 4.4.174+ #17
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5  D ffff8801c32e7658 24960  2115   2108 0x20020000
 ffff8801c32e7658 ffff8801d51797c0 82a36f646f96ed97 ffff8801d51797c0
 0000000000000000 ffff8801d517a000 ffff8801db71f180 ffff8801db71f1a8
 ffff8801db71e898 ffff8800a61b4740 ffff8801d51797c0 ffffed003865c001
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
 [<ffffffff8236affb>] xt_compat_lock+0x2b/0x30 net/netfilter/x_tables.c:1047
 [<ffffffff8252c230>] get_info+0x3d0/0x4c0 net/ipv4/netfilter/arp_tables.c:927
 [<ffffffff8252e1d1>] compat_do_arpt_get_ctl net/ipv4/netfilter/arp_tables.c:1599 [inline]
 [<ffffffff8252e1d1>] compat_do_arpt_get_ctl+0x381/0x7a0 net/ipv4/netfilter/arp_tables.c:1589
 [<ffffffff822fd1be>] compat_nf_sockopt net/netfilter/nf_sockopt.c:138 [inline]
 [<ffffffff822fd1be>] compat_nf_getsockopt+0x8e/0x130 net/netfilter/nf_sockopt.c:162
 [<ffffffff823d66ca>] compat_ip_getsockopt net/ipv4/ip_sockglue.c:1562 [inline]
 [<ffffffff823d66ca>] compat_ip_getsockopt+0x14a/0x1c0 net/ipv4/ip_sockglue.c:1541
 [<ffffffff823e35f9>] inet_csk_compat_getsockopt+0x99/0x120 net/ipv4/inet_connection_sock.c:901
 [<ffffffff823f8b30>] compat_tcp_getsockopt+0x40/0x80 net/ipv4/tcp.c:2958
 [<ffffffff821debf4>] compat_sock_common_getsockopt+0xb4/0x150 net/core/sock.c:2633
 [<ffffffff822ac9c5>] C_SYSC_getsockopt net/compat.c:509 [inline]
 [<ffffffff822ac9c5>] compat_SyS_getsockopt+0x155/0x540 net/compat.c:492
 [<ffffffff822ad593>] C_SYSC_socketcall net/compat.c:843 [inline]
 [<ffffffff822ad593>] compat_SyS_socketcall+0x523/0x630 net/compat.c:774
 [<ffffffff8100603d>] do_syscall_32_irqs_on arch/x86/entry/common.c:330 [inline]
 [<ffffffff8100603d>] do_fast_syscall_32+0x32d/0xa90 arch/x86/entry/common.c:397
 [<ffffffff8271a350>] sysenter_flags_fixed+0xd/0x1a
lowmemorykiller: Killing 'syz-executor.4' (27031) (tgid 27016), adj 1000,
   to free 51380kB on behalf of 'syz-fuzzer' (2071) because
   cache 188kB is below limit 6144kB for oom_score_adj 0
   Free memory is -1240kB above reserved
lowmemorykiller: Killing 'syz-executor.4' (27031) (tgid 27016), adj 1000,
   to free 51380kB on behalf of 'syz-executor.0' (27057) because
   cache 188kB is below limit 6144kB for oom_score_adj 0
   Free memory is -1240kB above reserved
1 lock held by syz-executor.5/2115:
 #0:  (&xt[i].compat_mutex){+.+.+.}, at: [<ffffffff8236affb>] xt_compat_lock+0x2b/0x30 net/netfilter/x_tables.c:1047
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 2072 Comm: syz-fuzzer Not tainted 4.4.174+ #17
task: ffff8800b79997c0 task.stack: ffff8801d42c8000
RIP: 0010:[<ffffffff811fdad6>]  [<ffffffff811fdad6>] mark_lock+0x16/0x1440 kernel/locking/lockdep.c:2900
RSP: 0018:ffff8801d42cf0e8  EFLAGS: 00000002
RAX: dffffc0000000000 RBX: 000000000000006c RCX: 000000000000000c
RDX: 000000000000000c RSI: ffff8800b799a128 RDI: ffff8800b79997c0
RBP: ffff8801d42cf0f0 R08: 0000000000000004 R09: ffff8800b799a148
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8800b79997c0
R13: ffff8800b799a128 R14: 0000000000000000 R15: 0000000000000000
FS:  000000c420028068(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000041a69e CR3: 00000001cf7ae000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000000 ffff8801d42cf280 ffffffff811fffff 0000000000000000
 0000000000000000 ffff8801d42cf2a0 0000000000000046 0000000000000000
 0000000000000000 ffff8801d42cf2c0 ffffffff811fffff ffff8800b799a140
Call Trace:
 [<ffffffff811fffff>] __lock_acquire+0xa4f/0x4f50 kernel/locking/lockdep.c:3173
 [<ffffffff8120687b>] __lock_release kernel/locking/lockdep.c:3439 [inline]
 [<ffffffff8120687b>] lock_release+0x61b/0xcf0 kernel/locking/lockdep.c:3611
 [<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
lowmemorykiller: Killing 'syz-executor.4' (27031) (tgid 27016), adj 1000,
   to free 51380kB on behalf of 'kswapd0' (28) because
   cache 188kB is below limit 6144kB for oom_score_adj 0
   Free memory is -1240kB above reserved
 [<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
 [<ffffffff813dc242>] __alloc_pages include/linux/gfp.h:415 [inline]
 [<ffffffff813dc242>] __alloc_pages_node include/linux/gfp.h:428 [inline]
 [<ffffffff813dc242>] alloc_pages_node include/linux/gfp.h:442 [inline]
 [<ffffffff813dc242>] __page_cache_alloc include/linux/pagemap.h:226 [inline]
 [<ffffffff813dc242>] page_cache_alloc_readahead include/linux/pagemap.h:242 [inline]
 [<ffffffff813dc242>] __do_page_cache_readahead+0x222/0x840 mm/readahead.c:184
 [<ffffffff813bf6de>] ra_submit mm/internal.h:55 [inline]
 [<ffffffff813bf6de>] do_sync_mmap_readahead mm/filemap.c:1917 [inline]
 [<ffffffff813bf6de>] filemap_fault+0x74e/0xc10 mm/filemap.c:1994
 [<ffffffff81665ed2>] ext4_filemap_fault+0x72/0xa0 fs/ext4/inode.c:5558
 [<ffffffff8142e82a>] __do_fault+0x1ca/0x350 mm/memory.c:2822
 [<ffffffff8143b9cc>] do_read_fault mm/memory.c:3012 [inline]
 [<ffffffff8143b9cc>] do_fault mm/memory.c:3177 [inline]
 [<ffffffff8143b9cc>] handle_pte_fault mm/memory.c:3346 [inline]
 [<ffffffff8143b9cc>] __handle_mm_fault mm/memory.c:3474 [inline]
 [<ffffffff8143b9cc>] handle_mm_fault+0x1cfc/0x3140 mm/memory.c:3503
 [<ffffffff810aaa4e>] __do_page_fault+0x28e/0x7f0 arch/x86/mm/fault.c:1243
 [<ffffffff810ab008>] do_page_fault+0x28/0x30 arch/x86/mm/fault.c:1306
 [<ffffffff82719e35>] page_fault+0x25/0x30 arch/x86/entry/entry_64.S:1064
Code: e9 62 ff ff ff 4c 89 f7 e8 e8 73 28 00 eb 9b 66 0f 1f 44 00 00 55 4c 8d 4e 20 89 d1 48 b8 00 00 00 00 00 fc ff df 48 89 e5 41 57 <41> 89 d7 4c 89 ca 41 56 48 c1 ea 03 41 be 01 00 00 00 41 55 41 
NMI backtrace for cpu 1
CPU: 1 PID: 20 Comm: khungtaskd Not tainted 4.4.174+ #17
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: 0018: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: 00007f7751614d50 CR3: 00000001cf7ae000 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 
lowmemorykiller: Killing 'syz-executor.4' (27031) (tgid 27016), adj 1000,
   to free 51380kB on behalf of 'syz-fuzzer' (2071) because
   cache 188kB is below limit 6144kB for oom_score_adj 0
   Free memory is -1356kB above reserved
lowmemorykiller: Killing 'syz-executor.4' (27031) (tgid 27016), adj 1000,
   to free 51380kB on behalf of 'kworker/u4:37' (9295) because
   cache 188kB is below limit 6144kB for oom_score_adj 0
   Free memory is -1356kB above reserved
lowmemorykiller: Killing 'syz-executor.4' (27031) (tgid 27016), adj 1000,
   to free 51380kB on behalf of 'syz-executor.0' (27057) because
   cache 188kB is below limit 6144kB for oom_score_adj 0
   Free memory is -1356kB above reserved
lowmemorykiller: Killing 'syz-executor.4' (27031) (tgid 27016), adj 1000,
   to free 51380kB on behalf of 'syz-executor.0' (27053) because
   cache 188kB is below limit 6144kB for oom_score_adj 0
   Free memory is -1356kB above reserved
lowmemorykiller: Killing 'syz-executor.4' (27031) (tgid 27016), adj 1000,
   to free 51380kB on behalf of 'syz-executor.0' (27057) because
   cache 188kB is below limit 6144kB for oom_score_adj 0
   Free memory is -1356kB above reserved
lowmemorykiller: Killing 'syz-executor.4' (27031) (tgid 27016), adj 1000,
   to free 51380kB on behalf of 'syz-fuzzer' (2086) because
   cache 188kB is below limit 6144kB for oom_score_adj 0
   Free memory is -1356kB above reserved
lowmemorykiller: Killing 'syz-executor.4' (27031) (tgid 27016), adj 1000,
   to free 51380kB on behalf of 'syz-fuzzer' (2072) because
   cache 188kB is below limit 6144kB for oom_score_adj 0
   Free memory is -1356kB above reserved
lowmemorykiller: Killing 'syz-executor.4' (27031) (tgid 27016), adj 1000,
   to free 51380kB on behalf of 'rs:main Q:Reg' (1917) because
   cache 188kB is below limit 6144kB for oom_score_adj 0
   Free memory is -1356kB above reserved