From: Jakub Kicinski <kuba@kernel.org>
To: Mikhail Lobanov <m.lobanov@rosa.ru>
Cc: "David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Paolo Abeni <pabeni@redhat.com>, Simon Horman <horms@kernel.org>,
David Bauer <mail@david-bauer.net>,
James Chapman <jchapman@katalix.com>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
lvc-project@linuxtesting.org
Subject: Re: [PATCH net-next v6] l2tp: fix double dst_release() on sk_dst_cache race
Date: Tue, 2 Dec 2025 11:08:05 -0800 [thread overview]
Message-ID: <20251202110805.765fa71d@kernel.org> (raw)
In-Reply-To: <20251202180545.18974-1-m.lobanov@rosa.ru>
On Tue, 2 Dec 2025 21:05:43 +0300 Mikhail Lobanov wrote:
> A reproducible rcuref - imbalanced put() warning is observed under
> IPv6 L2TP (pppol2tp) traffic with blackhole routes, indicating an
> imbalance in dst reference counting for routes cached in
> sk->sk_dst_cache and pointing to a subtle lifetime/synchronization
> issue between the helpers that validate and drop cached dst entries.
Breaks allmodconfig build:
ERROR: modpost: "ip_options_build" [net/l2tp/l2tp_core.ko] undefined!
Please note that net-next is closed for the duration of the merge
window. If you want to repost this (after waiting the customary 24h)
please do so as an RFC.
--
pw-bot: cr
next prev parent reply other threads:[~2025-12-02 19:08 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-02 18:05 [PATCH net-next v6] l2tp: fix double dst_release() on sk_dst_cache race Mikhail Lobanov
2025-12-02 19:08 ` Jakub Kicinski [this message]
2025-12-03 20:31 ` kernel test robot
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