page:ffffea0007198000 count:2 mapcount:0 mapping:          (null) index:0x0
flags: 0x8000000000004004(referenced|head)
page dumped because: VM_BUG_ON_PAGE(!PageLocked(page))
------------[ cut here ]------------
kernel BUG at mm/filemap.c:817!
SELinux:  policydb version 2064141099 does not match my version range 15-30
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 15342 Comm: syz-executor5 Not tainted 4.4.151-g3a2ec58 #22
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800b1331800 task.stack: ffff8801bbce0000
RIP: 0010:[<ffffffff81421495>]  [<ffffffff81421495>] unlock_page+0x115/0x150 mm/filemap.c:817
RSP: 0018:ffff8801bbce7a48  EFLAGS: 00010206
RAX: ffffffff83a6f940 RBX: ffffea0007198000 RCX: ffffc9000124b000
RDX: 0000000000020460 RSI: ffffffff81519469 RDI: ffff8800b13320dc
RBP: ffff8801bbce7a68 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
R13: ffffea0007198300 R14: ffffea0007198008 R15: ffff8801bbce7b30
FS:  0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f5788b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000080e88bc CR3: 00000001c707c000 CR4: 00000000001606f0
Stack:
 ffffea0007198000 dffffc0000000000 ffffea0007198300 ffffea0007198008
 ffff8801bbce7b58 ffffffff812cf2cd 1ffff1003779cf52 ffff8801bbce7ce8
 ffff8800b6133700 1ffff1003779cf5a 00000001841e893d ffff8801bbce7cd8
Call Trace:
 [<ffffffff812cf2cd>] get_futex_key+0x8ad/0xdc0 kernel/futex.c:598
 [<ffffffff812d402e>] futex_wake_op kernel/futex.c:1510 [inline]
 [<ffffffff812d402e>] do_futex+0x79e/0x17f0 kernel/futex.c:3236
 [<ffffffff812d5b89>] C_SYSC_futex kernel/futex_compat.c:200 [inline]
 [<ffffffff812d5b89>] compat_SyS_futex+0x1d9/0x2f0 kernel/futex_compat.c:174
 [<ffffffff81006d94>] do_syscall_32_irqs_on arch/x86/entry/common.c:393 [inline]
 [<ffffffff81006d94>] do_fast_syscall_32+0x324/0x8b0 arch/x86/entry/common.c:460
 [<ffffffff838cdb83>] sysenter_flags_fixed+0xd/0x1a
Code: e8 48 8d 04 c0 49 8d 3c c6 e8 b8 bc df ff 5b 41 5c 41 5d 41 5e 5d c3 e8 7a 31 f3 ff 48 c7 c6 e0 bb a9 83 48 89 df e8 bb ee 06 00 <0f> 0b 48 89 df e8 91 d1 0d 00 e9 0a ff ff ff e8 87 d1 0d 00 e9 
RIP  [<ffffffff81421495>] unlock_page+0x115/0x150 mm/filemap.c:817
 RSP <ffff8801bbce7a48>
---[ end trace c0b5a3f5bcded881 ]---