Re: [syzbot] WARNING in __nf_unregister_net_hook (4)

[Dmitry Vyukov]

On Sat, Apr 10, 2021 at 4:49 PM syzbot
<syzbot+154bd5be532a63aa778b@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    cc0626c2 net: smsc911x: skip acpi_device_id table when !CO..
> git tree:       net-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=110a3096d00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=7eff0f22b8563a5f
> dashboard link: https://syzkaller.appspot.com/bug?extid=154bd5be532a63aa778b
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+154bd5be532a63aa778b@xxxxxxxxxxxxxxxxxxxxxxxxx

Is this also fixed by "netfilter: arptables: use pernet ops struct
during unregister"?
The warning is the same, but the stack is different...

> hook not found, pf 2 num 0
> WARNING: CPU: 1 PID: 8144 at net/netfilter/core.c:480 __nf_unregister_net_hook+0x1eb/0x610 net/netfilter/core.c:480
> Modules linked in:
> CPU: 1 PID: 8144 Comm: syz-executor.0 Not tainted 5.12.0-rc4-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> RIP: 0010:__nf_unregister_net_hook+0x1eb/0x610 net/netfilter/core.c:480
> Code: 0f b6 14 02 48 89 c8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 11 04 00 00 8b 53 1c 89 ee 48 c7 c7 e0 26 6c 8a e8 72 df 87 01 <0f> 0b e9 e5 00 00 00 e8 09 1d 37 fa 44 8b 3c 24 4c 89 f8 48 c1 e0
> RSP: 0018:ffffc9001534f418 EFLAGS: 00010282
> RAX: 0000000000000000 RBX: ffff88802f867a00 RCX: 0000000000000000
> RDX: 0000000000040000 RSI: ffffffff815c5205 RDI: fffff52002a69e75
> RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000
> R10: ffffffff815bdf9e R11: 0000000000000000 R12: ffff8880272c8f20
> R13: 0000000000000000 R14: ffff88802fa34c00 R15: 0000000000000006
> FS:  00007feaf7d10700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007fb651f70ca0 CR3: 0000000069f31000 CR4: 00000000001506f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  nf_unregister_net_hook+0xd5/0x110 net/netfilter/core.c:502
>  nf_tables_unregister_hook.part.0+0x131/0x200 net/netfilter/nf_tables_api.c:234
>  nf_tables_unregister_hook net/netfilter/nf_tables_api.c:8122 [inline]
>  nf_tables_commit+0x1d9b/0x4710 net/netfilter/nf_tables_api.c:8122
>  nfnetlink_rcv_batch+0x975/0x21b0 net/netfilter/nfnetlink.c:508
>  nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:580 [inline]
>  nfnetlink_rcv+0x3af/0x420 net/netfilter/nfnetlink.c:598
>  netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
>  netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338
>  netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927
>  sock_sendmsg_nosec net/socket.c:654 [inline]
>  sock_sendmsg+0xcf/0x120 net/socket.c:674
>  ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350
>  ___sys_sendmsg+0xf3/0x170 net/socket.c:2404
>  __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433
>  do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
>  entry_SYSCALL_64_after_hwframe+0x44/0xae
> RIP: 0033:0x466459
> Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007feaf7d10188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
> RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459
> RDX: 0000000000000000 RSI: 000000002000c2c0 RDI: 0000000000000003
> RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
> R13: 00007ffe0fcaf04f R14: 00007feaf7d10300 R15: 0000000000022000
>
>
> ---
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