random: nonblocking pool is initialized page:ffffea00071b0000 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:819! invalid opcode: 0000 [#1] PREEMPT SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 1 PID: 3839 Comm: syz-executor660 Not tainted 4.4.131-g6ec0e3f #34 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8800bbade000 task.stack: ffff8800bb0d0000 RIP: 0010:[] [] unlock_page+0x115/0x150 mm/filemap.c:819 RSP: 0018:ffff8800bb0d7760 EFLAGS: 00010293 RAX: ffffffff83a6e7c0 RBX: ffffea00071b0000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81513249 RDI: ffff8800bbade8dc RBP: ffff8800bb0d7780 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000 R13: ffff8800bb0d7a30 R14: ffffea00071b1480 R15: ffffea00071b0008 FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f77bdb40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000204a4ff0 CR3: 00000000b100f000 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffffea00071b0000 dffffc0000000000 ffff8800bb0d7a30 ffffea00071b1480 ffff8800bb0d7868 ffffffff812cc1bc 0000000000000001 ffff8800bb0d7818 0000000000000046 ffff8800ad447700 00000000bbade8d8 ffff8800bb0d7a40 Call Trace: [] get_futex_key+0xadc/0xd80 kernel/futex.c:598 [] futex_wait_setup+0xd9/0x330 kernel/futex.c:2336 [] futex_wait+0x2af/0x600 kernel/futex.c:2399 [] do_futex+0x2a2/0x1770 kernel/futex.c:3186 [] C_SYSC_futex kernel/futex_compat.c:200 [inline] [] compat_SyS_futex+0x1d9/0x2f0 kernel/futex_compat.c:174 [] do_syscall_32_irqs_on arch/x86/entry/common.c:392 [inline] [] do_fast_syscall_32+0x326/0x8b0 arch/x86/entry/common.c:459 [] sysenter_flags_fixed+0xd/0x17 Code: e8 48 8d 04 c0 49 8d 3c c6 e8 48 c0 df ff 5b 41 5c 41 5d 41 5e 5d c3 e8 da 33 f3 ff 48 c7 c6 60 aa a9 83 48 89 df e8 4b eb 06 00 <0f> 0b 48 89 df e8 f1 b1 0d 00 e9 0a ff ff ff e8 e7 b1 0d 00 e9 RIP [] unlock_page+0x115/0x150 mm/filemap.c:819 RSP ---[ end trace 2f91d71cd12b4a4a ]---