page:ffffea0002be0000 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: 6403 Comm: syz-executor2 Not tainted 4.4.150-g5541782 #83 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801d7906000 task.stack: ffff8800ba210000 RIP: 0010:[] [] unlock_page+0x115/0x150 mm/filemap.c:817 RSP: 0018:ffff8800ba2178a0 EFLAGS: 00010212 RAX: ffffffff83a6f940 RBX: ffffea0002be0000 RCX: ffffc900076a1000 RDX: 000000000001f6f5 RSI: ffffffff815184c9 RDI: ffff8801d79068dc RBP: ffff8800ba2178c0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000 R13: ffffea0002be0300 R14: ffffea0002be0008 R15: ffff8800ba217988 FS: 00007f174ab5a700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000707914 CR3: 00000000ad85b000 CR4: 00000000001606f0 Stack: ffffea0002be0000 dffffc0000000000 ffffea0002be0300 ffffea0002be0008 ffff8800ba2179b0 ffffffff812cf1ad ffff8801d9bcf300 ffff8800ba217af8 ffff8801d8ae1900 1ffff10017442f25 0000000100000000 ffff8800ba217ae8 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 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 11 c9 0d 00 e9 0a ff ff ff e8 07 c9 0d 00 e9 RIP [] unlock_page+0x115/0x150 mm/filemap.c:817 RSP ---[ end trace 9b34ca165fed6b8b ]---