Free memory is -13164kB above reserved
lowmemorykiller: Killing 'syz-executor1' (32188) (tgid 32188), adj 1000,
   to free 32928kB on behalf of 'init' (1) because
   cache 216kB is below limit 6144kB for oom_score_adj 0
   Free memory is -13164kB above reserved
INFO: task syz-executor1:32294 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-executor1   D30184 32294   2115 0x20020004
 ffff880088d42f80 ffff8801d4718000 ffff880161728000 ffff880194b75f00
 ffff8801db621018 ffff8800add77a88 ffffffff828075c2 ffff8800add77b08
 ffff880088d42f80 ffffffff810efada 00fffc0000000000 ffff8801db6218f0
Call Trace:
 [<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
 [<ffffffff827d237a>] lock_sock include/net/sock.h:1404 [inline]
 [<ffffffff827d237a>] packet_setsockopt+0x94a/0x2630 net/packet/af_packet.c:3758
 [<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
 [<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:
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/2050:
 #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

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

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: 32293 Comm: syz-executor1 Not tainted 4.9.141+ #23
task: ffff880088d45f00 task.stack: ffff8800b8570000
RIP: 0010:[<ffffffff8131baab>] 
c [<ffffffff8131baab>] __sanitizer_cov_trace_pc+0x4b/0x50 kernel/kcov.c:110
RSP: 0018:ffff8800b8577328  EFLAGS: 00000246
RAX: 0000000000040000 RBX: ffff8800a2495f00 RCX: ffffc9000274e000
RDX: 0000000000040000 RSI: ffffffff821f0174 RDI: ffffffff841eb840
RBP: ffff8800b8577328 R08: ffff880088d46848 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: 0000000000001fff R14: ffff8800a2495f00 R15: 0000000000000600
FS:  0000000000000000(0000) GS:ffff8801db600000(0063) knlGS:00000000f570db40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00007fafabb98830 CR3: 000000006979c000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8800b85773d8
c ffffffff821f0174
c ffffffff821efede
c ffff8800b8577380
c
 ffffffff81ba7d7b
c 0000000000000246
c ffff880088d45f00
c ffffffff830cc2e0
c
 ffff8800b85774b0
c fffffbfff0601200
c 0000200ab85773a0
c ffff8800a24966c0
c
Call Trace:
 [<ffffffff821f0174>] lowmem_scan+0x4e4/0xaf0 drivers/staging/android/lowmemorykiller.c:153
 [<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
 [<ffffffff814c9e8b>] __alloc_pages include/linux/gfp.h:433 [inline]
 [<ffffffff814c9e8b>] __alloc_pages_node include/linux/gfp.h:446 [inline]
 [<ffffffff814c9e8b>] alloc_pages_node include/linux/gfp.h:460 [inline]
 [<ffffffff814c9e8b>] __vmalloc_area_node mm/vmalloc.c:1644 [inline]
 [<ffffffff814c9e8b>] __vmalloc_node_range+0x25b/0x600 mm/vmalloc.c:1702
 [<ffffffff814ca63b>] __vmalloc_node mm/vmalloc.c:1745 [inline]
 [<ffffffff814ca63b>] __vmalloc_node_flags mm/vmalloc.c:1759 [inline]
 [<ffffffff814ca63b>] vzalloc+0x5b/0x70 mm/vmalloc.c:1791
 [<ffffffff827cfbce>] alloc_one_pg_vec_page net/packet/af_packet.c:4208 [inline]
 [<ffffffff827cfbce>] alloc_pg_vec net/packet/af_packet.c:4233 [inline]
 [<ffffffff827cfbce>] packet_set_ring+0x51e/0x1810 net/packet/af_packet.c:4323
 [<ffffffff827d29d3>] packet_setsockopt+0xfa3/0x2630 net/packet/af_packet.c:3685
 [<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
 [<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
Code: 
c8b 
c90 
c38 
c12 
c00 
c00 
c83 
cfa 
c02 
c75 
c20 
c48 
c8b 
c88 
c40 
c12 
c00 
c00 
c8b 
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c3c 
c12 
c00 
c00 
c48 
c8b 
c11 
c48 
c83 
cc2 
c01 
c48 
c39 
cd0 
c76 
c07 
c48 
c89 
c34 
cd1 
c48 
c89 
c11 
c<5d> 
cc3 
c0f 
c1f 
c00 
c55 
cba 
c58 
c00 
c00 
c00 
c48 
c89 
ce5 
c41 
c55 
c49 
c89 
cfd 
c48 
c8b 
c