------------[ cut here ]------------
kernel BUG at lib/list_debug.c:53!
invalid opcode: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 8663 Comm: syz-executor2 Not tainted 4.13.0-rc6-next-20170825+ #9
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
task: ffff88002f5f63c0 task.stack: ffff88002ce58000
RIP: 0010:__list_del_entry_valid+0xef/0x150 lib/list_debug.c:51
RSP: 0018:ffff88002ce5ee90 EFLAGS: 00010286
RAX: 0000000000000054 RBX: ffff88002cf37a80 RCX: 0000000000000000
RDX: 0000000000000054 RSI: ffffffff8158b5ee RDI: ffffed00059cbdc6
RBP: ffff88002ce5eea8 R08: ffffffff85b302b8 R09: 0000000000000000
R10: ffff88002ce5e778 R11: 0000000000000000 R12: ffff88002cf37a80
R13: dffffc0000000000 R14: ffff88003b7bbc00 R15: ffff88002ce5f0d8
FS:  00007f72f254f700(0000) GS:ffff88003ec00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000147ccb8 CR3: 000000003bdb9000 CR4: 00000000000026f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 __list_del_entry include/linux/list.h:116 [inline]
 list_del include/linux/list.h:124 [inline]
 __remove_wait_queue include/linux/wait.h:182 [inline]
 userfaultfd_event_wait_completion+0x519/0x910 fs/userfaultfd.c:591
 dup_fctx fs/userfaultfd.c:687 [inline]
 dup_userfaultfd_complete+0x2de/0x480 fs/userfaultfd.c:695
 dup_mmap kernel/fork.c:726 [inline]
 dup_mm kernel/fork.c:1171 [inline]
 copy_mm+0xe9b/0x1310 kernel/fork.c:1225
 copy_process.part.35+0x1eae/0x4af0 kernel/fork.c:1727
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=8692 comm=syz-executor1
 copy_process kernel/fork.c:1540 [inline]
 _do_fork+0x1ef/0xfe0 kernel/fork.c:2019
 SYSC_clone kernel/fork.c:2129 [inline]
 SyS_clone+0x37/0x50 kernel/fork.c:2123
 do_syscall_64+0x26c/0x8c0 arch/x86/entry/common.c:287
 entry_SYSCALL64_slow_path+0x25/0x25
RIP: 0033:0x446749
RSP: 002b:00007f72f254ec08 EFLAGS: 00000286 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000446749
RDX: 000000002003b000 RSI: 0000000020038f62 RDI: 0000000000000000
RBP: 0000000000708000 R08: 0000000020056000 R09: 0000000000000000
R10: 0000000020010000 R11: 0000000000000286 R12: 00000000ffffffff
R13: 00000000000003b0 R14: 00000000006e2470 R15: 0000000020038f62
Code: 4c 89 e2 48 c7 c7 00 d0 fd 84 e8 b2 a5 1a ff 0f 0b 48 c7 c7 60 d0 fd 84 e8 a4 a5 1a ff 0f 0b 48 c7 c7 c0 d0 fd 84 e8 96 a5 1a ff <0f> 0b 48 c7 c7 20 d1 fd 84 e8 88 a5 1a ff 0f 0b 48 89 df 48 89 
RIP: __list_del_entry_valid+0xef/0x150 lib/list_debug.c:51 RSP: ffff88002ce5ee90
---[ end trace 9d0abceb4c9c8d63 ]---