Free memory is -13340kB above reserved
lowmemorykiller: Killing 'syz-executor5' (19236) (tgid 19232), adj 1000,
   to free 42376kB on behalf of 'kworker/u4:10' (31387) because
   cache 128kB is below limit 6144kB for oom_score_adj 0
   Free memory is -13340kB above reserved
INFO: task syz-executor1:19258 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   D29816 19258   2114 0x20020004
 ffff880149b65f00 ffff880179f3d800 ffff880102d53700 ffff8801a8fd17c0
 ffff8801db721018 ffff8801b0c77a88 ffffffff828075c2 ffff8801b0c77b08
 ffff880149b65f00 ffffffff810efada 00fffc0000000000 ffff8801db7218f0
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
 [<ffffffff827d201c>] lock_sock include/net/sock.h:1404 [inline]
 [<ffffffff827d201c>] packet_setsockopt+0x5ec/0x2630 net/packet/af_packet.c:3777
lowmemorykiller: Killing 'syz-executor5' (19236) (tgid 19232), adj 1000,
   to free 42376kB on behalf of 'kswapd0' (33) because
   cache 128kB is below limit 6144kB for oom_score_adj 0
   Free memory is -13340kB 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
 [<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:
lowmemorykiller: Killing 'syz-executor5' (19236) (tgid 19232), adj 1000,
   to free 42376kB on behalf of 'syz-executor1' (19261) because
   cache 128kB is below limit 6144kB for oom_score_adj 0
   Free memory is -13340kB above reserved
2 locks held by khungtaskd/24:
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131c2c0>] rcu_read_unlock include/linux/rcupdate.h:927 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131c2c0>] rcu_lock_break kernel/hung_task.c:143 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131c2c0>] check_hung_uninterruptible_tasks kernel/hung_task.c:177 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131c2c0>] watchdog+0x310/0xa20 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/2051:
 #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-executor0/19269:
 #0:  (&mm->mmap_sem){++++++}, at: [<ffffffff810b2f0b>] __do_page_fault+0x7db/0xa60 arch/x86/mm/fault.c:1342

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

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: 19261 Comm: syz-executor1 Not tainted 4.9.141+ #23
task: ffff8801aba5c740 task.stack: ffff88010cb88000
RIP: 0010:[<ffffffff821effb3>] 
c [<ffffffff821effb3>] lowmem_scan+0x323/0xaf0 drivers/staging/android/lowmemorykiller.c:131
RSP: 0018:ffff88010cb8f338  EFLAGS: 00000a03
RAX: 1ffff1003914f5f4 RBX: ffff8801c8a7af80 RCX: ffffc90002b58000
RDX: 0000000000000000 RSI: ffffffff821effa3 RDI: ffff8801c8a7afa4
RBP: ffff88010cb8f3d8 R08: ffff8801aba5d088 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: ffff8801c8a7b398 R14: ffff880110165f00 R15: 0000000000000600
FS:  0000000000000000(0000) GS:ffff8801db600000(0063) knlGS:00000000f5550b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000004236d0 CR3: 00000001b33f0000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff821efede
c ffff880100004b3d
c 0000000000000080
c 0000000000000246
c
 ffff8801aba5c740
c ffffffff830cc2e0
c ffff88010cb8f4b0
c fffffbfff0601200
c
 0000222a0cb8f3a0
c ffff8801101666c0
c 0000000003e80080
c ffff8801a1c34740
c
Call Trace:
 [<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: 
c00 
c00 
c49 
c8d 
c9d 
ce8 
cfb 
cff 
cff 
c48 
c81 
cfb 
c80 
c91 
c02 
c83 
c0f 
c84 
c3d 
c02 
c00 
c00 
ce8 
cbd 
cba 
c12 
cff 
c48 
c8d 
c7b 
c24 
c48 
c89 
cf8 
c48 
cc1 
ce8 
c03 
c42 
c0f 
cb6 
c14 
c20 
c<48> 
c89 
cf8 
c83 
ce0 
c07 
c83 
cc0 
c03 
c38 
cd0 
c7c 
c08 
c84 
cd2 
c0f 
c85 
c53 
c06 
c00 
c00 
c
lowmemorykiller: Killing 'syz-executor5' (19236) (tgid 19232), adj 1000,
   to free 42376kB on behalf of 'kworker/u4:10' (31387) because
   cache 128kB is below limit 6144kB for oom_score_adj 0
   Free memory is -13340kB above reserved
lowmemorykiller: Killing 'syz-executor5' (19236) (tgid 19232), adj 1000,
   to free 42376kB on behalf of 'rs:main Q:Reg' (1920) because
   cache 128kB is below limit 6144kB for oom_score_adj 0
   Free memory is -13340kB above reserved
lowmemorykiller: Killing 'syz-executor5' (19236) (tgid 19232), adj 1000,
   to free 42376kB on behalf of 'syz-fuzzer' (2076) because
   cache 128kB is below limit 6144kB for oom_score_adj 0
   Free memory is -13340kB above reserved
lowmemorykiller: Killing 'syz-executor5' (19236) (tgid 19232), adj 1000,
   to free 42376kB on behalf of 'init' (19303) because
   cache 128kB is below limit 6144kB for oom_score_adj 0
   Free memory is -13340kB above reserved
lowmemorykiller: Killing 'syz-executor5' (19236) (tgid 19232), adj 1000,
   to free 42376kB on behalf of 'kworker/u4:10' (31387) because
   cache 128kB is below limit 6144kB for oom_score_adj 0
   Free memory is -13340kB above reserved
lowmemorykiller: Killing 'syz-executor5' (19236) (tgid 19232), adj 1000,
   to free 42376kB on behalf of 'kswapd0' (33) because
   cache 128kB is below limit 6144kB for oom_score_adj 0
   Free memory is -13340kB above reserved