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Date: Thu, 20 Nov 2025 00:14:46 +0100
From: Pablo Neira Ayuso <pablo@netfilter.org>
To: Hamza Mahfooz <hamzamahfooz@linux.microsoft.com>
Cc: Phil Sutter <phil@nwl.cc>, Jozsef Kadlecsik <kadlec@netfilter.org>,
	Florian Westphal <fw@strlen.de>,
	"David S. Miller" <davem@davemloft.net>,
	Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
	Simon Horman <horms@kernel.org>, netdev@vger.kernel.org,
	netfilter-devel@vger.kernel.org, coreteam@netfilter.org,
	linux-kernel@vger.kernel.org
Subject: Re: Soft lock-ups caused by iptables
Message-ID: <aR5PZvdjpvGD2mIS@calendula>
References: <20251118221735.GA5477@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net>
 <aR3ZFSOawH-y_A3q@orbyte.nwl.cc>
 <20251119222940.GA5070@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net>
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In-Reply-To: <20251119222940.GA5070@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net>

On Wed, Nov 19, 2025 at 02:29:40PM -0800, Hamza Mahfooz wrote:
> On Wed, Nov 19, 2025 at 03:49:57PM +0100, Phil Sutter wrote:
> > Nftables ruleset validation code was refactored in v6.10 with commit
> > cff3bd012a95 ("netfilter: nf_tables: prefer nft_chain_validate"). This
> > is also present in v5.15.184, so in order to estimate whether a bug is
> > "new" or "old", better really use old kernels not recent minor releases
> > of old major ones. :)
> 
> FWIW I tried to repro this on v6.6.45 as well and it also suffers from
> this issue.

This example ruleset does not restore, it is missing ipsets.