page:ffffea0002db0000 count:2 mapcount:0 mapping: (null) index:0x0 flags: 0x4000000000004004(referenced|head) page dumped because: VM_BUG_ON_PAGE(!PageLocked(page)) ------------[ cut here ]------------ kernel BUG at mm/filemap.c:817! invalid opcode: 0000 [#1] PREEMPT SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 609 Comm: syz-executor6 Not tainted 4.4.153-g5e24b4e #90 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8800b7be3000 task.stack: ffff8801c8390000 RIP: 0010:[] [] unlock_page+0x115/0x150 mm/filemap.c:817 RSP: 0018:ffff8801c83978a0 EFLAGS: 00010212 RAX: ffffffff83a6f940 RBX: ffffea0002db0000 RCX: ffffc90007464000 RDX: 000000000001ffb1 RSI: ffffffff815195a9 RDI: ffff8800b7be38dc RBP: ffff8801c83978c0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000 R13: ffffea0002db0300 R14: ffffea0002db0008 R15: ffff8801c8397988 FS: 00007f2449048700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffeec1f4b70 CR3: 00000001d7caf000 CR4: 00000000001606f0 Stack: ffffea0002db0000 dffffc0000000000 ffffea0002db0300 ffffea0002db0008 ffff8801c83979b0 ffffffff812cf25d 0000000000000000 ffff8801c8397af8 ffff8801ce264000 1ffff10039072f25 00000001bd52fbb0 ffff8801c8397ae8 Call Trace: [] get_futex_key+0x8ad/0xdc0 kernel/futex.c:598 [] futex_requeue+0x1e7/0x1690 kernel/futex.c:1780 [] do_futex+0x204/0x17f0 kernel/futex.c:3248 [] SYSC_futex kernel/futex.c:3286 [inline] [] SyS_futex+0x1f0/0x300 kernel/futex.c:3254 [] entry_SYSCALL_64_fastpath+0x22/0x9e Code: e8 48 8d 04 c0 49 8d 3c c6 e8 88 bd df ff 5b 41 5c 41 5d 41 5e 5d c3 e8 8a 31 f3 ff 48 c7 c6 e0 bb a9 83 48 89 df e8 bb ee 06 00 <0f> 0b 48 89 df e8 51 d3 0d 00 e9 0a ff ff ff e8 47 d3 0d 00 e9 RIP [] unlock_page+0x115/0x150 mm/filemap.c:817 RSP ---[ end trace 33c5982d05c73d9c ]---