lowmemorykiller: Killing 'syz-executor.4' (32213) (tgid 32178), adj 1000,
   to free 51392kB on behalf of 'kworker/1:3' (16434) because
   cache 344kB is below limit 6144kB for oom_score_adj 0
   Free memory is 1028kB above reserved
INFO: task syz-executor.4:32213 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.4  D ffff8800a551f968 29872 32213   2113 0x20120004
 ffff8800a551f968 ffff8801c068c740 385bab9b25340207 ffff8801c068c740
 0000000000000000 ffff8801c068d000 ffff8801db71f180 ffff8801db71f1a8
 ffff8801db71e898 ffff8801d6788000 ffff8801c068c740 ffffed0014aa3001
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
 [<ffffffff8221b16a>] copy_net_ns+0xca/0x250 net/core/net_namespace.c:387
 [<ffffffff81136a90>] create_new_namespaces+0x2f0/0x670 kernel/nsproxy.c:95
 [<ffffffff8113709a>] copy_namespaces+0x28a/0x320 kernel/nsproxy.c:150
 [<ffffffff810cd012>] copy_process+0x2472/0x68a0 kernel/fork.c:1522
 [<ffffffff810d186e>] _do_fork+0x14e/0xdc0 kernel/fork.c:1806
 [<ffffffff810d25b7>] SYSC_clone kernel/fork.c:1917 [inline]
 [<ffffffff810d25b7>] SyS_clone+0x37/0x50 kernel/fork.c:1911
 [<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' (32213) (tgid 32178), adj 1000,
   to free 51392kB on behalf of 'syz-fuzzer' (2072) because
   cache 344kB is below limit 6144kB for oom_score_adj 0
   Free memory is 1028kB above reserved
lowmemorykiller: Killing 'syz-executor.4' (32213) (tgid 32178), adj 1000,
   to free 51392kB on behalf of 'kworker/u4:17' (10924) because
   cache 344kB is below limit 6144kB for oom_score_adj 0
   Free memory is 1028kB above reserved
1 lock held by syz-executor.4/32213:
 #0:  (net_mutex){+.+.+.}, at: [<ffffffff8221b16a>] copy_net_ns+0xca/0x250 net/core/net_namespace.c:387
Sending NMI to all CPUs:
NMI backtrace for cpu 0
CPU: 0 PID: 32349 Comm: syz-executor.1 Not tainted 4.4.174+ #17
task: ffff8801c05d17c0 task.stack: ffff88011ea40000
RIP: 0010:[<ffffffff811ffbbc>]  [<ffffffff811ffbbc>] __lock_acquire+0x60c/0x4f50 kernel/locking/lockdep.c:3092
RSP: 0018:ffff88011ea47150  EFLAGS: 00000083
RAX: ffff8800a1e7e6f0 RBX: ffff8801c05d17c0 RCX: 0000000000000001
RDX: 1ffff100143cfcde RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffff88011ea472c8 R08: 0000000000000001 R09: 0000000000000000
R10: ffffffff82836880 R11: ffffffff831a5078 R12: ffff8801c05d17c0
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8801db600000(0063) knlGS:00000000f5537b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00007fdd50cafea4 CR3: 00000000b4bb4000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000000 0000000000000000 ffff88011ea472e8 ffffffff811fffff
 ffff8801c05d2118 ffff8801c05d2080 ffff8801c05d2120 0000000000000000
 ffff880100000000 ffffffff83a87e80 ffff8801c05d2088 1ffff10000000000
Call Trace:
 [<ffffffff81205f6e>] lock_acquire+0x15e/0x450 kernel/locking/lockdep.c:3592
 [<ffffffff82717c98>] __raw_spin_lock include/linux/spinlock_api_smp.h:144 [inline]
 [<ffffffff82717c98>] _raw_spin_lock+0x38/0x50 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
 [<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
 [<ffffffff8146023c>] __vmalloc_node mm/vmalloc.c:1716 [inline]
 [<ffffffff8146023c>] __vmalloc_node_flags mm/vmalloc.c:1730 [inline]
 [<ffffffff8146023c>] vzalloc+0x5c/0x70 mm/vmalloc.c:1762
 [<ffffffff826d2ab1>] alloc_one_pg_vec_page net/packet/af_packet.c:4113 [inline]
 [<ffffffff826d2ab1>] alloc_pg_vec net/packet/af_packet.c:4138 [inline]
 [<ffffffff826d2ab1>] packet_set_ring+0x561/0x1940 net/packet/af_packet.c:4228
 [<ffffffff826d4cdf>] packet_setsockopt+0x2af/0x26c0 net/packet/af_packet.c:3610
 [<ffffffff822ac3a3>] C_SYSC_setsockopt net/compat.c:388 [inline]
 [<ffffffff822ac3a3>] compat_SyS_setsockopt+0x253/0x720 net/compat.c:368
 [<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
Code: 88 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 a7 33 00 00 48
NMI backtrace for cpu 1
CPU: 1 PID: 20 Comm: khungtaskd Not tainted 4.4.174+ #17
task: ffff8801da6f4740 task.stack: ffff8800001d0000
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:ffff8800001d7c88  EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000c00 RCX: 0000000000000000
RDX: 0000000000000c00 RSI: 0000000000000000 RDI: ffffffffff5fc300
RBP: ffff8800001d7cb8 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: 000000000040f460 CR3: 00000000ba7ec000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 0000000000000001 ffffffff82e5f2e0 ffffffff831a6ac0 fffffbfff0634c34
 000000000001b6c0 0000000000000008 ffff8800001d7cd8 ffffffff81092bee
 0000000000000008 ffffffff82924260 ffff8800001d7d30 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
lowmemorykiller: Killing 'syz-executor.4' (32213) (tgid 32178), adj 1000,
   to free 51392kB on behalf of 'syz-executor.1' (32349) because
   cache 344kB is below limit 6144kB for oom_score_adj 0
   Free memory is 1156kB above reserved
 [<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' (32213) (tgid 32178), adj 1000,
   to free 51392kB on behalf of 'syz-fuzzer' (2085) because
   cache 344kB is below limit 6144kB for oom_score_adj 0
   Free memory is 1156kB above reserved
lowmemorykiller: Killing 'syz-executor.4' (32213) (tgid 32178), adj 1000,
   to free 51392kB on behalf of 'syz-fuzzer' (2077) because
   cache 344kB is below limit 6144kB for oom_score_adj 0
   Free memory is 1156kB above reserved
lowmemorykiller: Killing 'syz-executor.4' (32213) (tgid 32178), adj 1000,
   to free 51392kB on behalf of 'kswapd0' (28) because
   cache 344kB is below limit 6144kB for oom_score_adj 0
   Free memory is 1156kB above reserved
lowmemorykiller: Killing 'syz-executor.4' (32213) (tgid 32178), adj 1000,
   to free 51392kB on behalf of 'init' (1) because
   cache 344kB is below limit 6144kB for oom_score_adj 0
   Free memory is 1156kB above reserved
lowmemorykiller: Killing 'syz-executor.4' (32213) (tgid 32178), adj 1000,
   to free 51392kB on behalf of 'init' (1) because
   cache 492kB is below limit 6144kB for oom_score_adj 0
   Free memory is 860kB above reserved
lowmemorykiller: Killing 'syz-executor.4' (32213) (tgid 32178), adj 1000,
   to free 51392kB on behalf of 'syz-executor.1' (32349) because
   cache 344kB is below limit 6144kB for oom_score_adj 0
   Free memory is 1156kB above reserved