------------[ cut here ]------------ proc_dir_entry 'ip6t_hashlimit/syzkaller1' already registered WARNING: CPU: 0 PID: 12724 at fs/proc/generic.c:363 proc_register+0x2e4/0x540 fs/proc/generic.c:362 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 12724 Comm: syz-executor.1 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:ffffc90001847800 EFLAGS: 00010246 RAX: caa4f442470fa000 RBX: ffff8880a3af13d0 RCX: 0000000000040000 RDX: ffffc90004c79000 RSI: 000000000001517d RDI: 000000000001517e RBP: ffffc90001847868 R08: ffffffff81601324 R09: fffffbfff1406516 R10: fffffbfff1406516 R11: 0000000000000000 R12: ffff8880a64643db R13: 000000000000000a R14: ffff8880a3af1300 R15: ffff8880a3af138c 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 rawv6_setsockopt+0x2cc/0x490 net/ipv6/raw.c:1081 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:00007f808db30c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007f808db316d4 RCX: 000000000045c479 RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000005 RBP: 000000000076bf20 R08: 0000000000000490 R09: 0000000000000000 R10: 0000000020000500 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000a32 R14: 00000000004d5bf0 R15: 000000000076bf2c Kernel Offset: disabled Rebooting in 86400 seconds..