lowmemorykiller: Killing 'syz-executor.2' (30018) (tgid 30001), adj 1000,
   to free 51380kB on behalf of 'syz-executor.0' (30047) because
   cache 92kB is below limit 6144kB for oom_score_adj 0
   Free memory is -1104kB above reserved
INFO: task syz-executor.3:29992 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.3  D ffff8800b778fbb8 28848 29992   2115 0x20020004
 ffff8800b778fbb8 ffff8801d29c2f80 3af4f7db2f51040c ffff8801d29c2f80
 0000000000000000 ffff8801d29c3800 ffff8801db61f180 ffff8801db61f1a8
 ffff8801db61e898 ffff8801d9840000 ffff8801d29c2f80 ffffed0016ef1001
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
 [<ffffffff8113737b>] unshare_nsproxy_namespaces+0xab/0x1e0 kernel/nsproxy.c:190
 [<ffffffff810d28d2>] SYSC_unshare kernel/fork.c:2092 [inline]
 [<ffffffff810d28d2>] SyS_unshare+0x302/0x6f0 kernel/fork.c:2042
 [<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.2' (30018) (tgid 30001), adj 1000,
   to free 51380kB on behalf of 'udevd' (469) because
   cache 92kB is below limit 6144kB for oom_score_adj 0
   Free memory is -1104kB above reserved
lowmemorykiller: Killing 'syz-executor.2' (30018) (tgid 30001), adj 1000,
   to free 51380kB on behalf of 'syz-fuzzer' (2082) because
   cache 92kB is below limit 6144kB for oom_score_adj 0
   Free memory is -1104kB above reserved
1 lock held by syz-executor.3/29992:
 #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: 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:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000402590 CR3: 00000000b91ee000 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
 [<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 
NMI backtrace for cpu 1
CPU: 1 PID: 1973 Comm: cron Not tainted 4.4.174+ #17
task: ffff8800b8a80000 task.stack: ffff8801d6710000
RIP: 0010:[<ffffffff812067e8>]  [<ffffffff812067e8>] lock_release+0x588/0xcf0 kernel/locking/lockdep.c:3615
RSP: 0018:ffff8801d6717378  EFLAGS: 00000296
RAX: 0000000000000007 RBX: ffff8801d659c740 RCX: 0000000000000004
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000246
RBP: ffff8801d6717378 R08: ffff8801d659cf18 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d659cf18
R13: ffff8801d659c740 R14: 0000000000003227 R15: 00000000000003e8
FS:  00007f7a341e47a0(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000736c85 CR3: 00000001d922a000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801d6717390 ffffffff82717f5b dffffc0000000000 ffff8801d6717440
 ffffffff8211e703 ffffffff8211e5af ffffffff000007b5 00000000000000ec
 0000000000000246 ffffffff82ea7320 ffff8800b8a80000 000000000016bcd8
Call Trace:
 [<ffffffff82717f5b>] __raw_spin_unlock include/linux/spinlock_api_smp.h:152 [inline]
 [<ffffffff82717f5b>] _raw_spin_unlock+0x1b/0x50 kernel/locking/spinlock.c:183
 [<ffffffff8211e703>] spin_unlock include/linux/spinlock.h:347 [inline]
 [<ffffffff8211e703>] task_unlock include/linux/sched.h:2974 [inline]
 [<ffffffff8211e703>] lowmem_scan+0x393/0xbf0 drivers/staging/android/lowmemorykiller.c:148
 [<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: 05 e8 7d e7 27 00 c7 83 c4 08 00 00 00 00 00 00 48 8b 7d b0 57 9d 0f 1f 44 00 00 48 81 c4 88 00 00 00 5b 41 5c 41 5d 41 5e 41 5f <5d> c3 48 c7 c0 80 7a 05 84 49 bf 00 00 00 00 00 fc ff df 48 c1 
lowmemorykiller: Killing 'syz-executor.2' (30018) (tgid 30001), adj 1000,
   to free 51380kB on behalf of 'syz-fuzzer' (2071) because
   cache 92kB is below limit 6144kB for oom_score_adj 0
   Free memory is -1104kB above reserved
lowmemorykiller: Killing 'syz-executor.2' (30018) (tgid 30001), adj 1000,
   to free 51380kB on behalf of 'udevd' (469) because
   cache 92kB is below limit 6144kB for oom_score_adj 0
   Free memory is -1104kB above reserved
lowmemorykiller: Killing 'syz-executor.2' (30018) (tgid 30001), adj 1000,
   to free 51380kB on behalf of 'init' (1) because
   cache 92kB is below limit 6144kB for oom_score_adj 0
   Free memory is -1104kB above reserved
lowmemorykiller: Killing 'syz-executor.2' (30018) (tgid 30001), adj 1000,
   to free 51380kB on behalf of 'syz-fuzzer' (2082) because
   cache 92kB is below limit 6144kB for oom_score_adj 0
   Free memory is -1104kB above reserved
lowmemorykiller: Killing 'syz-executor.2' (30018) (tgid 30001), adj 1000,
   to free 51380kB on behalf of 'udevd' (469) because
   cache 92kB is below limit 6144kB for oom_score_adj 0
   Free memory is -1104kB above reserved
lowmemorykiller: Killing 'syz-executor.2' (30018) (tgid 30001), adj 1000,
   to free 51380kB on behalf of 'cron' (1973) because
   cache 92kB is below limit 6144kB for oom_score_adj 0
   Free memory is -1104kB above reserved