313617 pages reserved
lowmemorykiller: Killing 'syz-executor0' (22441) (tgid 22436), adj 1000,
   to free 32932kB on behalf of 'syz-executor2' (2100) because
   cache 244kB is below limit 6144kB for oom_score_adj 0
   Free memory is -13564kB above reserved
INFO: task syz-executor5:22446 blocked for more than 140 seconds.
      Not tainted 4.9.135+ #15
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor5   D30184 22446   2097 0x20020004
 ffff8800b318c740 ffff8801ae9d0b00 ffff8801c9ffcd00 ffff8801a93097c0
 ffff8801db621018 ffff88017ae77a88 ffffffff827fa982 ffff88017ae77b08
 ffff8800b318c740 ffffffff810ef85a 00fffc0000000000 ffff8801db6218f0
Call Trace:
 [<ffffffff827fbeaf>] schedule+0x7f/0x1b0 kernel/sched/core.c:3553
 [<ffffffff822a0d3c>] __lock_sock+0x13c/0x250 net/core/sock.c:2035
 [<ffffffff822a0f46>] lock_sock_nested+0xf6/0x120 net/core/sock.c:2505
 [<ffffffff827c532f>] lock_sock include/net/sock.h:1404 [inline]
 [<ffffffff827c532f>] packet_setsockopt+0x50f/0x2630 net/packet/af_packet.c:3668
 [<ffffffff827c7531>] compat_packet_setsockopt+0xe1/0x140 net/packet/af_packet.c:4016
 [<ffffffff82383349>] C_SYSC_setsockopt net/compat.c:399 [inline]
 [<ffffffff82383349>] 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
 [<ffffffff8280c160>] 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: [<ffffffff8131bb4c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8131bb4c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff813fe314>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/2023:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff82808cd2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff81d2b032>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2142
2 locks held by kworker/u4:7/11076:
 #0:  ("events_unbound"){.+.+.+}, at: [<ffffffff81130c6c>] process_one_work+0x73c/0x1530 kernel/workqueue.c:2085
 #1:  ((&sub_info->work)){+.+.+.}, at: [<ffffffff81130ca4>] process_one_work+0x774/0x1530 kernel/workqueue.c:2089

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

NMI backtrace for cpu 1
CPU: 1 PID: 24 Comm: khungtaskd Not tainted 4.9.135+ #15
 ffff8801d9907d08 ffffffff81b36bf9 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff81098330 ffff8801d9907d40
 ffffffff81b41d09 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81b36bf9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81b36bf9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81b41d09>] nmi_cpu_backtrace.cold.0+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81b41c9c>] nmi_trigger_cpumask_backtrace+0x12c/0x151 lib/nmi_backtrace.c:60
 [<ffffffff81098434>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff8131c0dd>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff8131c0dd>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff8131c0dd>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff8131c0dd>] watchdog+0x6ad/0xa20 kernel/hung_task.c:239
 [<ffffffff811428dd>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff8280addc>] 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: 2101 Comm: syz-executor1 Not tainted 4.9.135+ #15
task: ffff8801d1724740 task.stack: ffff8801d9e00000
RIP: 0010:[<ffffffff8141a00a>] 
c [<ffffffff8141a00a>] __read_once_size include/linux/compiler.h:243 [inline]
RIP: 0010:[<ffffffff8141a00a>] 
c [<ffffffff8141a00a>] find_lock_task_mm+0xaa/0x270 mm/oom_kill.c:114
RSP: 0000:ffff8801d9e07490  EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffff8801d70661c0 RCX: 1ffff1003ae0cc3a
RDX: 0000000000000000 RSI: ffffffff81419fc6 RDI: ffffffff82e75400
RBP: ffff8801d9e074c8 R08: ffff8801d17250b0 R09: 296d540454c17ee0
R10: ffff8801d1724740 R11: 0000000000000001 R12: ffff8801563017c0
R13: ffff8801d70661d0 R14: ffff8801af8217c0 R15: ffff880156301ef8
FS:  0000000000000000(0000) GS:ffff8801db600000(0063) knlGS:00000000086ad900
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000080a5be0 CR3: 00000001b0fa7000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff81419f60
c ffff8801af821f80
c ffff8801563017c0
c dffffc0000000000
c
 ffff880156301bd8
c ffff8801af8217c0
c 0000000000000600
c ffff8801d9e07578
c
 ffffffff821e3d2f
c ffffffff821e3c2e
c ffff8801d9e07520
c ffffffff81b9ba7b
c
Call Trace:
 [<ffffffff821e3d2f>] lowmem_scan+0x34f/0xaf0 drivers/staging/android/lowmemorykiller.c:134
 [<ffffffff81449c16>] do_shrink_slab mm/vmscan.c:398 [inline]
 [<ffffffff81449c16>] shrink_slab.part.8+0x3c6/0xa00 mm/vmscan.c:501
 [<ffffffff8145574d>] shrink_slab mm/vmscan.c:465 [inline]
 [<ffffffff8145574d>] shrink_node+0x1ed/0x740 mm/vmscan.c:2602
 [<ffffffff81456017>] shrink_zones mm/vmscan.c:2749 [inline]
 [<ffffffff81456017>] do_try_to_free_pages mm/vmscan.c:2791 [inline]
 [<ffffffff81456017>] try_to_free_pages+0x377/0xb80 mm/vmscan.c:3002
 [<ffffffff81428951>] __perform_reclaim mm/page_alloc.c:3324 [inline]
 [<ffffffff81428951>] __alloc_pages_direct_reclaim mm/page_alloc.c:3345 [inline]
 [<ffffffff81428951>] __alloc_pages_slowpath mm/page_alloc.c:3697 [inline]
 [<ffffffff81428951>] __alloc_pages_nodemask+0x981/0x1bd0 mm/page_alloc.c:3862
 [<ffffffff814156f1>] __alloc_pages include/linux/gfp.h:433 [inline]
 [<ffffffff814156f1>] __alloc_pages_node include/linux/gfp.h:446 [inline]
 [<ffffffff814156f1>] alloc_pages_node include/linux/gfp.h:460 [inline]
 [<ffffffff814156f1>] __page_cache_alloc include/linux/pagemap.h:208 [inline]
 [<ffffffff814156f1>] page_cache_read mm/filemap.c:2007 [inline]
 [<ffffffff814156f1>] filemap_fault+0xaf1/0x1110 mm/filemap.c:2192
 [<ffffffff816e76b1>] ext4_filemap_fault+0x71/0xa0 fs/ext4/inode.c:5853
 [<ffffffff81492e73>] __do_fault+0x223/0x500 mm/memory.c:2833
 [<ffffffff814a3616>] do_read_fault mm/memory.c:3180 [inline]
 [<ffffffff814a3616>] do_fault mm/memory.c:3315 [inline]
 [<ffffffff814a3616>] handle_pte_fault mm/memory.c:3516 [inline]
 [<ffffffff814a3616>] __handle_mm_fault mm/memory.c:3603 [inline]
 [<ffffffff814a3616>] handle_mm_fault+0x1326/0x2350 mm/memory.c:3640
 [<ffffffff810b2a93>] __do_page_fault+0x403/0xa60 arch/x86/mm/fault.c:1406
 [<ffffffff810b3147>] do_page_fault+0x27/0x30 arch/x86/mm/fault.c:1469
 [<ffffffff8280bc35>] page_fault+0x25/0x30 arch/x86/entry/entry_64.S:951
Code: 
c80 
c3c 
c01 
c00 
c0f 
c85 
cb5 
c01 
c00 
c00 
c49 
c8b 
c9c 
c24 
c38 
c07 
c00 
c00 
c48 
cb8 
c00 
c00 
c00 
c00 
c00 
cfc 
cff 
cdf 
c4c 
c8d 
c6b 
c10 
c4c 
c89 
ce9 
c48 
cc1 
ce9 
c03 
c80 
c3c 
c01 
c00 
c<0f> 
c85 
c81 
c01 
c00 
c00 
c48 
c8b 
c43 
c10 
c48 
c8d 
c98 
c28 
cfa 
cff 
cff 
c4c 
c39 
ce8 
c0f 
c