netdev - Re: [PATCH v3 net] dccp/tcp: Unhash sk from ehash for tb2 alloc failure after check

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Date: Fri, 8 Mar 2024 18:23:18 +0100
From: Eric Dumazet <edumazet@...gle.com>
To: patchwork-bot+netdevbpf@...nel.org
Cc: Kuniyuki Iwashima <kuniyu@...zon.com>, davem@...emloft.net, kuba@...nel.org, 
	pabeni@...hat.com, dsahern@...nel.org, joannelkoong@...il.com, 
	kuni1840@...il.com, netdev@...r.kernel.org, syzkaller@...glegroups.com
Subject: Re: [PATCH v3 net] dccp/tcp: Unhash sk from ehash for tb2 alloc
 failure after check_estalblished().

On Fri, Feb 16, 2024 at 10:50 AM <patchwork-bot+netdevbpf@...nel.org> wrote:
>
> Hello:
>
> This patch was applied to netdev/net.git (main)
> by David S. Miller <davem@...emloft.net>:
>
> On Wed, 14 Feb 2024 11:13:08 -0800 you wrote:
> > syzkaller reported a warning [0] in inet_csk_destroy_sock() with no
> > repro.
> >
> >   WARN_ON(inet_sk(sk)->inet_num && !inet_csk(sk)->icsk_bind_hash);
> >
> > However, the syzkaller's log hinted that connect() failed just before
> > the warning due to FAULT_INJECTION.  [1]
> >
> > [...]
>
> Here is the summary with links:
>   - [v3,net] dccp/tcp: Unhash sk from ehash for tb2 alloc failure after check_estalblished().
>     https://git.kernel.org/netdev/net/c/66b60b0c8c4a
>
> You are awesome, thank you!
> --
> Deet-doot-dot, I am a bot.
> https://korg.docs.kernel.org/patchwork/pwbot.html
>

Kuniyuki, syzbot is not happy after this patch I think. I will release
the report soon.

WARNING: CPU: 0 PID: 23948 at include/net/sock.h:799
sk_nulls_del_node_init_rcu+0x166/0x1a0 include/net/sock.h:799
Modules linked in:
CPU: 0 PID: 23948 Comm: syz-executor.2 Not tainted
6.8.0-rc6-syzkaller-00159-gc055fc00c07b #0
Hardware name: Google Google Compute Engine/Google Compute Engine,
BIOS Google 01/25/2024
RIP: 0010:sk_nulls_del_node_init_rcu+0x166/0x1a0 include/net/sock.h:799
Code: e8 7f 71 c6 f7 83 fb 02 7c 25 e8 35 6d c6 f7 4d 85 f6 0f 95 c0
5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 1b 6d c6 f7 90 <0f> 0b
90 eb b2 e8 10 6d c6 f7 4c 89 e7 be 04 00 00 00 e8 63 e7 d2
RSP: 0018:ffffc900032d7848 EFLAGS: 00010246
RAX: ffffffff89cd0035 RBX: 0000000000000001 RCX: 0000000000040000
RDX: ffffc90004de1000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: 1ffff1100439ac26 R08: ffffffff89ccffe3 R09: 1ffff1100439ac28
R10: dffffc0000000000 R11: ffffed100439ac29 R12: ffff888021cd6140
R13: dffffc0000000000 R14: ffff88802a9bf5c0 R15: ffff888021cd6130
FS: 00007f3b823f16c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3b823f0ff8 CR3: 000000004674a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
__inet_hash_connect+0x140f/0x20b0 net/ipv4/inet_hashtables.c:1139
dccp_v6_connect+0xcb9/0x1480 net/dccp/ipv6.c:956
__inet_stream_connect+0x262/0xf30 net/ipv4/af_inet.c:678
inet_stream_connect+0x65/0xa0 net/ipv4/af_inet.c:749
__sys_connect_file net/socket.c:2048 [inline]
__sys_connect+0x2df/0x310 net/socket.c:2065
__do_sys_connect net/socket.c:2075 [inline]
__se_sys_connect net/socket.c:2072 [inline]
__x64_sys_connect+0x7a/0x90 net/socket.c:2072
do_syscall_64+0xf9/0x240
entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f3b8167dda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 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 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3b823f10c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007f3b817abf80 RCX: 00007f3b8167dda9
RDX: 000000000000001c RSI: 0000000020000040 RDI: 0000000000000003
RBP: 00007f3b823f1120 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 000000000000000b R14: 00007f3b817abf80 R15: 00007ffd3beb57b8
</TASK>