------------[ cut here ]------------
proc_dir_entry 'ip6t_hashlimit/veth1' already registered
WARNING: CPU: 1 PID: 10326 at fs/proc/generic.c:363 proc_register+0x2e4/0x540 fs/proc/generic.c:362
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 10326 Comm: syz-executor.2 Not tainted 5.6.0-rc3-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+0x1fb/0x318 lib/dump_stack.c:118
 panic+0x264/0x7a9 kernel/panic.c:221
 __warn+0x209/0x210 kernel/panic.c:582
 report_bug+0x1b6/0x2f0 lib/bug.c:195
 fixup_bug arch/x86/kernel/traps.c:174 [inline]
 do_error_trap+0xcf/0x1c0 arch/x86/kernel/traps.c:267
 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:286
 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:proc_register+0x2e4/0x540 fs/proc/generic.c:362
Code: 4c 8b 75 c8 4c 8b 7d a8 48 8b 5d b0 74 08 48 89 df e8 60 2d cf ff 48 8b 13 48 c7 c7 6d 9e e7 88 4c 89 e6 31 c0 e8 9c c9 63 ff <0f> 0b 48 c7 c7 08 f4 31 89 e8 8e 06 35 06 48 b8 00 00 00 00 00 fc
RSP: 0018:ffffc900017777f0 EFLAGS: 00010246
RAX: bd4974851930c000 RBX: ffff8880a2b8e390 RCX: 0000000000040000
RDX: ffffc9000e986000 RSI: 000000000000f4ad RDI: 000000000000f4ae
RBP: ffffc90001777858 R08: ffffffff81601324 R09: fffffbfff1406516
R10: fffffbfff1406516 R11: 0000000000000000 R12: ffff88804633cf1b
R13: 0000000000000005 R14: ffff8880a2b8e2c0 R15: ffff8880a2b8e34c
 proc_create_seq_private+0x1b5/0x210 fs/proc/generic.c:593
 htable_create net/netfilter/xt_hashlimit.c:341 [inline]
 hashlimit_mt_check_common+0xc08/0x12e0 net/netfilter/xt_hashlimit.c:902
 hashlimit_mt_check_v1+0x26e/0x450 net/netfilter/xt_hashlimit.c:928
 xt_check_match+0x6e0/0xb60 net/netfilter/x_tables.c:501
 check_match net/ipv6/netfilter/ip6_tables.c:489 [inline]
 find_check_match net/ipv6/netfilter/ip6_tables.c:506 [inline]
 find_check_entry net/ipv6/netfilter/ip6_tables.c:557 [inline]
 translate_table+0x159b/0x22e0 net/ipv6/netfilter/ip6_tables.c:734
 do_replace net/ipv6/netfilter/ip6_tables.c:1153 [inline]
 do_ip6t_set_ctl+0x2c3/0x550 net/ipv6/netfilter/ip6_tables.c:1681
 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
 nf_setsockopt+0x27a/0x2a0 net/netfilter/nf_sockopt.c:115
 ipv6_setsockopt+0x9a/0x160 net/ipv6/ipv6_sockglue.c:949
 tcp_setsockopt+0xbe/0xd0 net/ipv4/tcp.c:3165
 sock_common_setsockopt+0x99/0xb0 net/core/sock.c:3149
 __sys_setsockopt+0x582/0x720 net/socket.c:2130
 __do_sys_setsockopt net/socket.c:2146 [inline]
 __se_sys_setsockopt net/socket.c:2143 [inline]
 __x64_sys_setsockopt+0xbf/0xd0 net/socket.c:2143
 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c479
Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f5a590a4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f5a590a56d4 RCX: 000000000045c479
RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000004
RBP: 000000000076bfc0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020001140 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000a32 R14: 00000000004d5bf0 R15: 000000000076bfcc
Kernel Offset: disabled
Rebooting in 86400 seconds..