Cannot find add_set index 0 as target ------------[ cut here ]------------ proc_dir_entry 'ipt_CLUSTERIP/0.0.0.7' already registered WARNING: CPU: 0 PID: 10642 at fs/proc/generic.c:330 proc_register+0x2d6/0x3b0 fs/proc/generic.c:329 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 10642 Comm: syz-executor2 Not tainted 4.16.0-rc1+ #314 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 panic+0x1e4/0x41c kernel/panic.c:183 __warn+0x1dc/0x200 kernel/panic.c:547 report_bug+0x211/0x2d0 lib/bug.c:184 fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178 fixup_bug arch/x86/kernel/traps.c:247 [inline] do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315 invalid_op+0x58/0x80 arch/x86/entry/entry_64.S:957 RIP: 0010:proc_register+0x2d6/0x3b0 fs/proc/generic.c:329 RSP: 0018:ffff8801aeedf360 EFLAGS: 00010286 RAX: dffffc0000000008 RBX: ffff8801d006e3d0 RCX: ffffffff815abdbe RDX: 0000000000004b9c RSI: ffffc900015df000 RDI: 1ffff10035ddbdf1 RBP: ffff8801aeedf3b8 R08: 1ffff10035ddbdb3 R09: 0000000000000000 R10: ffff8801aeedf218 R11: 0000000000000000 R12: ffff8801d7b84840 R13: dffffc0000000000 R14: ffff8801d33f0ee0 R15: ffff8801d7b848fb proc_create_data+0xf8/0x180 fs/proc/generic.c:494 clusterip_config_init net/ipv4/netfilter/ipt_CLUSTERIP.c:250 [inline] clusterip_tg_check+0xf9c/0x16d0 net/ipv4/netfilter/ipt_CLUSTERIP.c:488 xt_check_target+0x22c/0x7d0 net/netfilter/x_tables.c:850 check_target net/ipv4/netfilter/ip_tables.c:513 [inline] find_check_entry.isra.8+0x8c8/0xcb0 net/ipv4/netfilter/ip_tables.c:554 translate_table+0xed1/0x1610 net/ipv4/netfilter/ip_tables.c:725 do_replace net/ipv4/netfilter/ip_tables.c:1141 [inline] do_ipt_set_ctl+0x370/0x5f0 net/ipv4/netfilter/ip_tables.c:1675 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline] nf_setsockopt+0x67/0xc0 net/netfilter/nf_sockopt.c:115 ip_setsockopt+0x97/0xa0 net/ipv4/ip_sockglue.c:1259 udp_setsockopt+0x45/0x80 net/ipv4/udp.c:2401 ipv6_setsockopt+0xa0/0x130 net/ipv6/ipv6_sockglue.c:917 tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2905 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2975 SYSC_setsockopt net/socket.c:1849 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1828 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x453a59 RSP: 002b:00007f451d503c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007f451d5046d4 RCX: 0000000000453a59 RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000018 RBP: 000000000071bf58 R08: 00000000000003a8 R09: 0000000000000000 R10: 00000000200f9c58 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004d5 R14: 00000000006f7498 R15: 0000000000000001 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..