device lo entered promiscuous mode page:ffffea00072b8000 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: 6415 Comm: syz-executor6 Not tainted 4.4.151-ge917467 #84 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8800bb1a4800 task.stack: ffff8801d85b0000 RIP: 0010:[] [] unlock_page+0x115/0x150 mm/filemap.c:817 RSP: 0018:ffff8801d85b78a0 EFLAGS: 00010216 RAX: ffffffff83a6f940 RBX: ffffea00072b8000 RCX: ffffc90007062000 RDX: 000000000002a806 RSI: ffffffff81519469 RDI: ffff8800bb1a50dc RBP: ffff8801d85b78c0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000 R13: ffffea00072b8300 R14: ffffea00072b8008 R15: ffff8801d85b7988 FS: 00007f9211071700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000707914 CR3: 00000001d8266000 CR4: 00000000001606f0 Stack: ffffea00072b8000 dffffc0000000000 ffffea00072b8300 ffffea00072b8008 ffff8801d85b79b0 ffffffff812cf2cd 0000000000000000 ffff8801d85b7af8 ffff8801d89e1900 1ffff1003b0b6f25 00000001d2321eb0 ffff8801d85b7ae8 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 91 d1 0d 00 e9 0a ff ff ff e8 87 d1 0d 00 e9 RIP [] unlock_page+0x115/0x150 mm/filemap.c:817 RSP ---[ end trace b4208efc99957a9a ]---