netdev - Re: [PATCH net v3] net/tcp: Disable TCP-AO static key after RCU grace period

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Message-ID: <20240802010250.82312-1-kuniyu@amazon.com>
Date: Thu, 1 Aug 2024 18:02:50 -0700
From: Kuniyuki Iwashima <kuniyu@...zon.com>
To: <0x7f454c46@...il.com>
CC: <davem@...emloft.net>, <dsahern@...nel.org>, <edumazet@...gle.com>,
	<kuba@...nel.org>, <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
	<pabeni@...hat.com>, <stable@...nel.org>, <kuniyu@...zon.com>
Subject: Re: [PATCH net v3] net/tcp: Disable TCP-AO static key after RCU grace period

From: Dmitry Safonov <0x7f454c46@...il.com>
Date: Fri, 2 Aug 2024 01:37:28 +0100
> On Thu, 1 Aug 2024 at 01:13, Dmitry Safonov via B4 Relay
> <devnull+0x7f454c46.gmail.com@...nel.org> wrote:
> >
> > From: Dmitry Safonov <0x7f454c46@...il.com>
> [..]
> > Happened on netdev test-bot[1], so not a theoretical issue:
> 
> Self-correction: I see a static_key fix in git.tip tree from a recent
> regression, which could lead to the same kind of failure. So, I'm not
> entirely sure the issue isn't theoretical.
> https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=224fa3552029

My syzkaller instances recently started to report similar splats over
different places (TCP-AO/MD5, fl6, netfilter, perf, etc), and I was
suspecting a bug in the jump label side.

report19:2:jump_label: Fatal kernel bug, unexpected op at fl6_sock_lookup include/net/ipv6.h:414 [inline] [000000001bd3e3db] (e9 ee 00 00 00 != 0f 1f 44 00 00)) size:5 type:1
report23:1:jump_label: Fatal kernel bug, unexpected op at nf_skip_egress include/linux/netfilter_netdev.h:136 [inline] [00000000c1241913] (e9 e9 0a 00 00 != 0f 1f 44 00 00)) size:5 type:1
report45:2:jump_label: Fatal kernel bug, unexpected op at tcp_ao_required include/net/tcp.h:2776 [inline] [000000009a4b37e9] (eb 5a e8 e1 57 != 66 90 0f 1f 00)) size:2 type:1
report49:3:jump_label: Fatal kernel bug, unexpected op at perf_sw_event include/linux/perf_event.h:1432 [inline] [00000000c1f7a26c] (eb 24 e9 63 fe != 66 90 0f 1f 00)) size:2 type:1
report58:2:jump_label: Fatal kernel bug, unexpected op at tcp_md5_do_lookup include/net/tcp.h:1852 [inline] [00000000fbd24b58] (e9 8d 01 00 00 != 0f 1f 44 00 00)) size:5 type:1

I'll cherry-pick the patch and see if it fixes them altogether.
It will take few days.

Thanks!