linux-kernel - Re: Soft lock-ups caused by iptables

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Message-ID: <aR5PZvdjpvGD2mIS@calendula>
Date: Thu, 20 Nov 2025 00:14:46 +0100
From: Pablo Neira Ayuso <pablo@...filter.org>
To: Hamza Mahfooz <hamzamahfooz@...ux.microsoft.com>
Cc: Phil Sutter <phil@....cc>, Jozsef Kadlecsik <kadlec@...filter.org>,
	Florian Westphal <fw@...len.de>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org, coreteam@...filter.org,
	linux-kernel@...r.kernel.org
Subject: Re: Soft lock-ups caused by iptables

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.