device lo entered promiscuous mode page:ffffea0007260000 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: 1 PID: 4856 Comm: syz-executor5 Not tainted 4.4.152-ge5c5f1f #89 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801d96bc800 task.stack: ffff8801cbff0000 RIP: 0010:[] [] unlock_page+0x115/0x150 mm/filemap.c:817 RSP: 0018:ffff8801cbff78a0 EFLAGS: 00010216 RAX: ffffffff83a6f940 RBX: ffffea0007260000 RCX: ffffc900068a6000 RDX: 00000000000390a7 RSI: ffffffff81519559 RDI: ffff8801d96bd0dc RBP: ffff8801cbff78c0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000 R13: ffffea0007260300 R14: ffffea0007260008 R15: ffff8801cbff7988 FS: 00007f6f65f6f700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020048000 CR3: 00000000bae5b000 CR4: 00000000001606f0 Stack: ffffea0007260000 dffffc0000000000 ffffea0007260300 ffffea0007260008 ffff8801cbff79b0 ffffffff812cf20d 0000000000000000 ffff8801cbff7af8 ffff8801bbc2d400 1ffff100397fef25 00000001d0dac5b0 ffff8801cbff7ae8 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 8a7624bfbc99e952 ]---