Date:   Mon, 13 Jul 2020 20:56:20 -0700
From:   syzbot <syzbot+2570f2c036e3da5db176@...kaller.appspotmail.com>
To:     coreteam@...filter.org, davem@...emloft.net, fw@...len.de,
        kadlec@...ckhole.kfki.hu, kadlec@...filter.org, kuba@...nel.org,
        kuznet@....inr.ac.ru, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
        pablo@...filter.org, syzkaller-bugs@...glegroups.com,
        yoshfuji@...ux-ipv6.org
Subject: WARNING in __nf_unregister_net_hook (2)

Hello,

syzbot found the following crash on:

HEAD commit:    0aea6d5c Merge tag 'for-linus-5.8b-rc5-tag' of git://git.k..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1646fd67100000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b1a5a263f7a540cb
dashboard link: https://syzkaller.appspot.com/bug?extid=2570f2c036e3da5db176
compiler:       clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1646988b100000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=132b1263100000

The bug was bisected to:

commit db8ab38880e06dedbfc879e75f5b0ddc495f4eb6
Author: Florian Westphal <fw@...len.de>
Date:   Thu Feb 28 11:02:52 2019 +0000

    netfilter: nf_tables: merge ipv4 and ipv6 nat chain types

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1013e3db100000
final crash:    https://syzkaller.appspot.com/x/report.txt?x=1213e3db100000
console output: https://syzkaller.appspot.com/x/log.txt?x=1413e3db100000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+2570f2c036e3da5db176@...kaller.appspotmail.com
Fixes: db8ab38880e0 ("netfilter: nf_tables: merge ipv4 and ipv6 nat chain types")

------------[ cut here ]------------
hook not found, pf 2 num 0
WARNING: CPU: 0 PID: 6775 at net/netfilter/core.c:413 __nf_unregister_net_hook+0x3e6/0x4a0 net/netfilter/core.c:413
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 6775 Comm: syz-executor554 Not tainted 5.8.0-rc4-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+0x1f0/0x31e lib/dump_stack.c:118
 panic+0x264/0x7a0 kernel/panic.c:231
 __warn+0x227/0x250 kernel/panic.c:600
 report_bug+0x1b1/0x2e0 lib/bug.c:198
 handle_bug+0x42/0x80 arch/x86/kernel/traps.c:235
 exc_invalid_op+0x16/0x40 arch/x86/kernel/traps.c:255
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:542
RIP: 0010:__nf_unregister_net_hook+0x3e6/0x4a0 net/netfilter/core.c:413
Code: 49 30 c3 02 01 48 8b 44 24 20 42 8a 04 28 84 c0 0f 85 ad 00 00 00 41 8b 14 24 48 c7 c7 78 ad 08 89 89 de 31 c0 e8 6a 5a a0 fa <0f> 0b e9 04 ff ff ff 44 89 e1 80 e1 07 80 c1 03 38 c1 0f 8c 44 fc
RSP: 0018:ffffc90001277718 EFLAGS: 00010246
RAX: 08b629c459c08900 RBX: 0000000000000002 RCX: ffff8880941721c0
RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000282
RBP: ffffffff895b8008 R08: dffffc0000000000 R09: fffffbfff16338a7
R10: fffffbfff16338a7 R11: 0000000000000000 R12: ffff888094f5461c
R13: dffffc0000000000 R14: 0000000000000050 R15: ffffffff895b7040
 nft_unregister_basechain_hooks net/netfilter/nf_tables_api.c:206 [inline]
 nft_table_disable net/netfilter/nf_tables_api.c:835 [inline]
 nf_tables_table_disable net/netfilter/nf_tables_api.c:868 [inline]
 nf_tables_commit+0x32d3/0x4d70 net/netfilter/nf_tables_api.c:7550
 nfnetlink_rcv_batch net/netfilter/nfnetlink.c:486 [inline]
 nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:544 [inline]
 nfnetlink_rcv+0x14a5/0x1e50 net/netfilter/nfnetlink.c:562
 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
 netlink_unicast+0x786/0x940 net/netlink/af_netlink.c:1329
 netlink_sendmsg+0xa57/0xd70 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0x519/0x800 net/socket.c:2352
 ___sys_sendmsg net/socket.c:2406 [inline]
 __sys_sendmsg+0x2b1/0x360 net/socket.c:2439
 do_syscall_64+0x73/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x440709
Code: Bad RIP value.
RSP: 002b:00007fff97b1aa78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440709
RDX: 0000000000000000 RSI: 000000002000c2c0 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8
R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000401f10
R13: 0000000000401fa0 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

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