------------[ cut here ]------------
proc_dir_entry 'ipt_CLUSTERIP/172.20.20.187' already registered
WARNING: CPU: 0 PID: 12158 at fs/proc/generic.c:371 proc_register+0x34c/0x700 fs/proc/generic.c:371
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 12158 Comm: syz-executor.5 Not tainted 5.9.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x18f/0x20d lib/dump_stack.c:118
 panic+0x2e3/0x75c kernel/panic.c:231
 __warn.cold+0x20/0x4a kernel/panic.c:600
 report_bug+0x1bd/0x210 lib/bug.c:198
 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:234
 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:254
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536
RIP: 0010:proc_register+0x34c/0x700 fs/proc/generic.c:371
Code: df 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 5d 03 00 00 48 8b 44 24 28 48 c7 c7 a0 0f 5a 88 48 8b b0 d8 00 00 00 e8 56 f7 5e ff <0f> 0b 48 c7 c7 e0 af ce 89 e8 26 db 0f 06 48 8b 4c 24 38 48 b8 00
RSP: 0018:ffffc9001f0ff3f8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff8881f458a240 RSI: ffffffff815dafc7 RDI: fffff52003e1fe71
RBP: ffff88809efdf8f8 R08: 0000000000000001 R09: ffff8880ae6318e7
R10: 0000000000000000 R11: 0000000000000001 R12: ffff888024d33d58
R13: ffff8880932d9a40 R14: dffffc0000000000 R15: 000000000000000d
 proc_create_data+0x130/0x190 fs/proc/generic.c:560
 clusterip_config_init net/ipv4/netfilter/ipt_CLUSTERIP.c:281 [inline]
 clusterip_tg_check+0x1741/0x1d13 net/ipv4/netfilter/ipt_CLUSTERIP.c:502
 xt_check_target+0x26c/0x650 net/netfilter/x_tables.c:1019
 check_target net/ipv4/netfilter/ip_tables.c:511 [inline]
 find_check_entry.constprop.0+0x7a9/0x9a0 net/ipv4/netfilter/ip_tables.c:553
 translate_table+0xbe1/0x1600 net/ipv4/netfilter/ip_tables.c:717
 do_replace net/ipv4/netfilter/ip_tables.c:1135 [inline]
 do_ipt_set_ctl+0x56e/0xb61 net/ipv4/netfilter/ip_tables.c:1627
 nf_setsockopt+0x83/0xe0 net/netfilter/nf_sockopt.c:101
 ip_setsockopt+0x3c3/0x39d0 net/ipv4/ip_sockglue.c:1436
 udp_setsockopt+0x76/0xc0 net/ipv4/udp.c:2711
 __sys_setsockopt+0x2db/0x610 net/socket.c:2132
 __do_sys_setsockopt net/socket.c:2143 [inline]
 __se_sys_setsockopt net/socket.c:2140 [inline]
 __x64_sys_setsockopt+0xba/0x150 net/socket.c:2140
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d5b9
Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fcb3976ac78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 000000000002dd80 RCX: 000000000045d5b9
RDX: 0000000000000040 RSI: 0004000000000000 RDI: 0000000000000003
RBP: 000000000118cf90 R08: 00000000000002c8 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007ffce8f4f64f R14: 00007fcb3976b9c0 R15: 000000000118cf4c
Kernel Offset: disabled
Rebooting in 86400 seconds..