page:ffffea0002dc0000 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: 1 PID: 10506 Comm: syz-executor4 Not tainted 4.4.153-g5e24b4e #26 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801d6828000 task.stack: ffff8801bb5a8000 RIP: 0010:[] [] unlock_page+0x115/0x150 mm/filemap.c:817 RSP: 0018:ffff8801bb5af828 EFLAGS: 00010216 RAX: ffffffff83a6f940 RBX: ffffea0002dc0000 RCX: ffffc90006eb5000 RDX: 0000000000022b1c RSI: ffffffff815195a9 RDI: ffff8801d68288dc RBP: ffff8801bb5af848 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000 R13: ffffea0002dc0040 R14: ffffea0002dc0008 R15: ffff8801bb5af910 FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f57efb40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000020000fc0 CR3: 00000001cd8c7000 CR4: 00000000001606f0 Stack: ffffea0002dc0000 dffffc0000000000 ffffea0002dc0040 ffffea0002dc0008 ffff8801bb5af938 ffffffff812cf25d ffff8801d9bd4200 ffff8801bb5afa80 ffff8800b4757700 1ffff100376b5f16 0000000100000000 ffff8801bb5afa70 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 [] C_SYSC_futex kernel/futex_compat.c:200 [inline] [] compat_SyS_futex+0x1d9/0x2f0 kernel/futex_compat.c:174 [] do_syscall_32_irqs_on arch/x86/entry/common.c:393 [inline] [] do_fast_syscall_32+0x324/0x8b0 arch/x86/entry/common.c:460 [] sysenter_flags_fixed+0xd/0x1a 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 9ae895e0c95cf715 ]---