page:ffffea0007338000 count:2 mapcount:0 mapping: (null) index:0x0 netlink: 16 bytes leftover after parsing attributes in process `syz-executor5'. flags: 0x8000000000004004(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: 8268 Comm: syz-executor6 Not tainted 4.4.150-g5541782 #83 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8800bb8c0000 task.stack: ffff8801d0098000 RIP: 0010:[] [] unlock_page+0x115/0x150 mm/filemap.c:817 RSP: 0018:ffff8801d009fac0 EFLAGS: 00010212 RAX: ffffffff83a6f940 RBX: ffffea0007338000 RCX: ffffc90005e71000 RDX: 000000000000cc24 RSI: ffffffff815184c9 RDI: ffff8800bb8c08dc RBP: ffff8801d009fae0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000 R13: ffffea0007338300 R14: ffffea0007338008 R15: ffff8801d009fba8 FS: 00007f5e7ffab700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3f956ad000 CR3: 00000001ce424000 CR4: 00000000001606f0 Stack: ffffea0007338000 dffffc0000000000 ffffea0007338300 ffffea0007338008 ffff8801d009fbd0 ffffffff812cf1ad 1ffff1003a013f61 ffff8801d009fd60 ffff8800b33e0f00 1ffff1003a013f69 00000001841e88bd ffff8801d009fd50 Call Trace: [] get_futex_key+0x8ad/0xdc0 kernel/futex.c:598 [] futex_wake_op kernel/futex.c:1510 [inline] [] do_futex+0x79e/0x17f0 kernel/futex.c:3236 [] 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 b328d255dd45b999 ]---