Free memory is -13260kB above reserved
lowmemorykiller: Killing 'syz-executor.3' (25345) (tgid 25329), adj 1000,
   to free 51376kB on behalf of 'rs:main Q:Reg' (1899) because
   cache 132kB is below limit 6144kB for oom_score_adj 0
   Free memory is -13260kB above reserved
INFO: task syz-executor.0:25335 blocked for more than 140 seconds.
      Not tainted 4.9.141+ #23
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0  D29368 25335   2103 0x20020004
 ffff88008f3e4740 ffff8801a9dda100 ffff88009933b180 ffff8801c7815f00
 ffff8801db621018 ffff88013e02fa88 ffffffff828075c2 ffff88013e02fb08
 ffff88008f3e4740 ffffffff810efada 00fffc0000000000 ffff8801db6218f0
Call Trace:
lowmemorykiller: Killing 'syz-executor.3' (25345) (tgid 25329), adj 1000,
   to free 51376kB on behalf of 'udevd' (3679) because
   cache 132kB is below limit 6144kB for oom_score_adj 0
   Free memory is -13260kB above reserved
 [<ffffffff82808aef>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff822acffc>] __lock_sock+0x13c/0x250 net/core/sock.c:2035
 [<ffffffff822ad206>] lock_sock_nested+0xf6/0x120 net/core/sock.c:2505
 [<ffffffff827d2640>] lock_sock include/net/sock.h:1404 [inline]
 [<ffffffff827d2640>] packet_setsockopt+0xc10/0x2630 net/packet/af_packet.c:3856
lowmemorykiller: Killing 'syz-executor.3' (25345) (tgid 25329), adj 1000,
   to free 51376kB on behalf of 'syz-fuzzer' (2072) because
   cache 280kB is below limit 6144kB for oom_score_adj 0
   Free memory is -13324kB above reserved
 [<ffffffff827d4141>] compat_packet_setsockopt+0xe1/0x140 net/packet/af_packet.c:4016
 [<ffffffff8238f7d9>] C_SYSC_setsockopt net/compat.c:399 [inline]
 [<ffffffff8238f7d9>] compat_SyS_setsockopt+0x169/0x550 net/compat.c:382
lowmemorykiller: Killing 'syz-executor.3' (25345) (tgid 25329), adj 1000,
   to free 51376kB on behalf of 'getty' (25380) because
   cache 260kB is below limit 6144kB for oom_score_adj 0
   Free memory is -13288kB above reserved
 [<ffffffff81006311>] do_syscall_32_irqs_on arch/x86/entry/common.c:328 [inline]
 [<ffffffff81006311>] do_fast_syscall_32+0x2f1/0xa10 arch/x86/entry/common.c:390
 [<ffffffff82818de0>] entry_SYSENTER_compat+0x90/0xa2 arch/x86/entry/entry_64_compat.S:137

Showing all locks held in the system:
3 locks held by kworker/1:1/22:
 #0:  ("%s"("ipv6_addrconf")){.+.+..}, at: [<ffffffff81130f0c>] process_one_work+0x73c/0x15f0 kernel/workqueue.c:2085
 #1:  ((addr_chk_work).work){+.+...}, at: [<ffffffff81130f44>] process_one_work+0x774/0x15f0 kernel/workqueue.c:2089
 #2:  (rtnl_mutex){+.+.+.}, at: [<ffffffff823412d7>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70
2 locks held by kworker/0:1/23:
 #0:  ("events"){.+.+.+}, at: [<ffffffff81130f0c>] process_one_work+0x73c/0x15f0 kernel/workqueue.c:2085
 #1:  ((&rew.rew_work)){+.+...}, at: [<ffffffff81130f44>] process_one_work+0x774/0x15f0 kernel/workqueue.c:2089
2 locks held by khungtaskd/24:
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131c0cc>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131c0cc>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff813fe63f>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/2029:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff82815952>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff81d37362>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
1 lock held by syz-executor.2/12801:
 #0:  (&sig->cred_guard_mutex){+.+.+.}, at: [<ffffffff81520d73>] prepare_bprm_creds+0x53/0x110 fs/exec.c:1369
5 locks held by kworker/u4:13/14243:
 #0:  ("%s""netns"){.+.+.+}, at: [<ffffffff81130f0c>] process_one_work+0x73c/0x15f0 kernel/workqueue.c:2085
 #1:  (net_cleanup_work){+.+.+.}, at: [<ffffffff81130f44>] process_one_work+0x774/0x15f0 kernel/workqueue.c:2089
 #2:  (net_mutex){+.+.+.}, at: [<ffffffff822e681f>] cleanup_net+0x13f/0x8b0 net/core/net_namespace.c:439
 #3:  (rtnl_mutex){+.+.+.}, at: [<ffffffff823412d7>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:70
 #4:  (rcu_preempt_state.exp_mutex){+.+...}, at: [<ffffffff8124a749>] exp_funnel_lock kernel/rcu/tree_exp.h:256 [inline]
 #4:  (rcu_preempt_state.exp_mutex){+.+...}, at: [<ffffffff8124a749>] _synchronize_rcu_expedited+0x339/0x840 kernel/rcu/tree_exp.h:569
1 lock held by syz-executor.4/25344:
 #0:  (net_mutex){+.+.+.}, at: [<ffffffff822e70e5>] copy_net_ns+0x155/0x330 net/core/net_namespace.c:406
1 lock held by syz-executor.3/25345:
 #0:  (net_mutex){+.+.+.}, at: [<ffffffff822e70e5>] copy_net_ns+0x155/0x330 net/core/net_namespace.c:406
1 lock held by syz-executor.3/25362:
 #0:  (net_mutex){+.+.+.}, at: [<ffffffff822e70e5>] copy_net_ns+0x155/0x330 net/core/net_namespace.c:406

=============================================

lowmemorykiller: Killing 'syz-executor.3' (25345) (tgid 25329), adj 1000,
   to free 51376kB on behalf of 'init' (1) because
   cache 260kB is below limit 6144kB for oom_score_adj 0
   Free memory is -13288kB above reserved
lowmemorykiller: Killing 'syz-executor.3' (25345) (tgid 25329), adj 1000,
   to free 51376kB on behalf of 'getty' (25381) because
   cache 260kB is below limit 6144kB for oom_score_adj 0
   Free memory is -13288kB above reserved
lowmemorykiller: Killing 'syz-executor.3' (25345) (tgid 25329), adj 1000,
   to free 51376kB on behalf of 'syz-executor.5' (2104) because
   cache 332kB is below limit 6144kB for oom_score_adj 0
   Free memory is -13256kB above reserved
lowmemorykiller: Killing 'syz-executor.3' (25345) (tgid 25329), adj 1000,
   to free 51376kB on behalf of 'rs:main Q:Reg' (1899) because
   cache 332kB is below limit 6144kB for oom_score_adj 0
   Free memory is -13256kB above reserved
NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.141+ #23
 ffff8801d9907d08 ffffffff81b42e79 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810983b0 ffff8801d9907d40
 ffffffff81b4df89 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81b42e79>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b42e79>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81b4df89>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81b4df1c>] nmi_trigger_cpumask_backtrace+0x12c/0x151 lib/nmi_backtrace.c:60
 [<ffffffff810984b4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff8131c65d>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8131c65d>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8131c65d>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8131c65d>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
 [<ffffffff81142c3d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff82817a5c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 25377 Comm: getty Not tainted 4.9.141+ #23
task: ffff8800975117c0 task.stack: ffff8801bb008000
RIP: 0010:[<ffffffff81205a50>] 
c [<ffffffff81205a50>] mark_lock+0x0/0x1290 kernel/locking/lockdep.c:3032
RSP: 0000:ffff8801bb00f0c8  EFLAGS: 00000002
RAX: 0000000000000000 RBX: ffff880097512138 RCX: ffff880097512159
RDX: 0000000000000006 RSI: ffff880097512138 RDI: ffff8800975117c0
RBP: ffff8801bb00f280 R08: ffff880097512158 R09: 0000000000000001
R10: ffff8800975117c0 R11: 1ffff10012ea2426 R12: 0000000000000075
R13: 0000000000000005 R14: 0000000000000000 R15: ffff88009751215a
FS:  00007f1763739700(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000459e00 CR3: 000000013a389000 CR4: 00000000001606b0
Stack:
 ffffffff81207f8d
c ffff88009751205c
c 0000000000000000
c ffff8801bb00f2a0
c
 ffffffff81207a04
c ffff880097512060
c ffff880097512130
c ffffffff83c73d80
c
 ffff8800975120e8
c 000000000000536e
c ffff880097512128
c ffff880097512060
c
Call Trace:
 [<ffffffff8120c8d0>] lock_acquire+0x130/0x3e0 kernel/locking/lockdep.c:3756
 [<ffffffff82816c26>] __raw_spin_lock include/linux/spinlock_api_smp.h:144 [inline]
 [<ffffffff82816c26>] _raw_spin_lock+0x36/0x50 kernel/locking/spinlock.c:151
 [<ffffffff8141a061>] spin_lock include/linux/spinlock.h:302 [inline]
 [<ffffffff8141a061>] task_lock include/linux/sched.h:3257 [inline]
 [<ffffffff8141a061>] find_lock_task_mm+0xf1/0x270 mm/oom_kill.c:115
 [<ffffffff821effdf>] lowmem_scan+0x34f/0xaf0 drivers/staging/android/lowmemorykiller.c:134
 [<ffffffff81449cc6>] do_shrink_slab mm/vmscan.c:398 [inline]
 [<ffffffff81449cc6>] shrink_slab.part.8+0x3c6/0xa00 mm/vmscan.c:501
 [<ffffffff814557fd>] shrink_slab mm/vmscan.c:465 [inline]
 [<ffffffff814557fd>] shrink_node+0x1ed/0x740 mm/vmscan.c:2602
 [<ffffffff814560c7>] shrink_zones mm/vmscan.c:2749 [inline]
 [<ffffffff814560c7>] do_try_to_free_pages mm/vmscan.c:2791 [inline]
 [<ffffffff814560c7>] try_to_free_pages+0x377/0xb80 mm/vmscan.c:3002
 [<ffffffff81428a01>] __perform_reclaim mm/page_alloc.c:3324 [inline]
 [<ffffffff81428a01>] __alloc_pages_direct_reclaim mm/page_alloc.c:3345 [inline]
 [<ffffffff81428a01>] __alloc_pages_slowpath mm/page_alloc.c:3697 [inline]
 [<ffffffff81428a01>] __alloc_pages_nodemask+0x981/0x1bd0 mm/page_alloc.c:3862
 [<ffffffff8143564a>] __alloc_pages include/linux/gfp.h:433 [inline]
 [<ffffffff8143564a>] __alloc_pages_node include/linux/gfp.h:446 [inline]
 [<ffffffff8143564a>] alloc_pages_node include/linux/gfp.h:460 [inline]
 [<ffffffff8143564a>] __page_cache_alloc include/linux/pagemap.h:208 [inline]
 [<ffffffff8143564a>] __do_page_cache_readahead+0x21a/0x8b0 mm/readahead.c:183
 [<ffffffff81415534>] ra_submit mm/internal.h:59 [inline]
 [<ffffffff81415534>] do_sync_mmap_readahead mm/filemap.c:2066 [inline]
 [<ffffffff81415534>] filemap_fault+0x924/0x1110 mm/filemap.c:2143
 [<ffffffff816e7721>] ext4_filemap_fault+0x71/0xa0 fs/ext4/inode.c:5853
 [<ffffffff81492ef3>] __do_fault+0x223/0x500 mm/memory.c:2833
 [<ffffffff814a3696>] do_read_fault mm/memory.c:3180 [inline]
 [<ffffffff814a3696>] do_fault mm/memory.c:3315 [inline]
 [<ffffffff814a3696>] handle_pte_fault mm/memory.c:3516 [inline]
 [<ffffffff814a3696>] __handle_mm_fault mm/memory.c:3603 [inline]
 [<ffffffff814a3696>] handle_mm_fault+0x1326/0x2350 mm/memory.c:3640
 [<ffffffff810b2b33>] __do_page_fault+0x403/0xa60 arch/x86/mm/fault.c:1406
 [<ffffffff810b31e7>] do_page_fault+0x27/0x30 arch/x86/mm/fault.c:1469
 [<ffffffff828188b5>] page_fault+0x25/0x30 arch/x86/entry/entry_64.S:951
Code: 
c17 
cf3 
c03 
c03 
c85 
cc0 
c0f 
c84 
c01 
ca9 
c1f 
c00 
c48 
c83 
cc4 
c40 
c31 
cc0 
c5b 
c41 
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c41 
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c41 
c5e 
c41 
c5f 
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cc3 
c4c 
c89 
cff 
ce8 
cf6 
cd5 
c2e 
c00 
ceb 
cd7 
c0f 
c1f 
c40 
c00 
c<55> 
c4c 
c8d 
c46 
c20 
c89 
cd1 
c48 
cb8 
c00 
c00 
c00 
c00 
c00 
cfc 
cff 
cdf 
c48 
c89 
ce5 
c41 
c