page:ffffea0007220000 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! invalid opcode: 0000 [#1] PREEMPT SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 1217 Comm: syz-executor2 Not tainted 4.4.153-g5e24b4e #90 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8800a3706000 task.stack: ffff8801badc0000 RIP: 0010:[] [] unlock_page+0x115/0x150 mm/filemap.c:817 RSP: 0018:ffff8801badc77c8 EFLAGS: 00010202 RAX: ffffffff83a6f940 RBX: ffffea0007220000 RCX: ffffc90001233000 RDX: 0000000000022c90 RSI: ffffffff815195a9 RDI: ffff8800a37068dc RBP: ffff8801badc77e8 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000 R13: ffffea0007220300 R14: ffffea0007220008 R15: ffff8801badc78b0 FS: 00007f9662399700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f11a396e638 CR3: 00000000b6027000 CR4: 00000000001606f0 Stack: ffffea0007220000 dffffc0000000000 ffffea0007220300 ffffea0007220008 ffff8801badc78d8 ffffffff812cf25d 0000000000000000 ffff8801badc7ab0 ffff8800b1376300 1ffff100375b8f0a 0000000100000000 ffff8801badc7aa0 Call Trace: [] get_futex_key+0x8ad/0xdc0 kernel/futex.c:598 [] futex_wait_setup+0xd9/0x330 kernel/futex.c:2376 [] futex_wait+0x2af/0x600 kernel/futex.c:2439 [] do_futex+0x2a4/0x17f0 kernel/futex.c:3226 [] 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 eeac1c07577ee7f9 ]---