From: Jakub Kicinski <kuba@kernel.org>
To: Li Chen <me@linux.beauty>
Cc: Jonathan Corbet <corbet@lwn.net>,
Pasha Tatashin <pasha.tatashin@soleen.com>,
Mike Rapoport <rppt@kernel.org>,
Pratyush Yadav <pratyush@kernel.org>,
Eric Dumazet <edumazet@google.com>,
Neal Cardwell <ncardwell@google.com>,
Kuniyuki Iwashima <kuniyu@google.com>,
"David S. Miller" <davem@davemloft.net>,
David Ahern <dsahern@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Simon Horman <horms@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
"Borislav Petkov (AMD)" <bp@alien8.de>,
Randy Dunlap <rdunlap@infradead.org>,
Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
Petr Mladek <pmladek@suse.com>,
Feng Tang <feng.tang@linux.alibaba.com>,
Kees Cook <kees@kernel.org>, Li RongQing <lirongqing@baidu.com>,
Arnd Bergmann <arnd@arndb.de>, Askar Safin <safinaskar@gmail.com>,
Frank van der Linden <fvdl@google.com>,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
netdev@vger.kernel.org
Subject: Re: [PATCH v1 3/3] liveupdate: suppress TCP RST during post-kexec restore window
Date: Fri, 30 Jan 2026 17:05:33 -0800 [thread overview]
Message-ID: <20260130170533.257db5fb@kernel.org> (raw)
In-Reply-To: <20260130145122.368748-4-me@linux.beauty>
On Fri, 30 Jan 2026 22:51:19 +0800 Li Chen wrote:
> During a kexec-based live update, userspace may restore established TCP
> connections after the new kernel has booted (e.g. via CRIU). Any packet
> arriving for a not-yet-restored socket will hit the no-socket path and
> trigger a TCP RST, causing the peer to immediately drop the connection.
Can you not add a filter to simply drop those packets until workload is
running again? It'd actually be less racy than this hac^w patch ...
next prev parent reply other threads:[~2026-01-31 1:05 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-30 14:51 [PATCH v1 0/3] liveupdate: suppress TCP RST during post-kexec restore window Li Chen
2026-01-30 14:51 ` [PATCH v1 3/3] " Li Chen
2026-01-31 1:05 ` Jakub Kicinski [this message]
2026-02-01 1:44 ` Li Chen
2026-02-03 0:53 ` Jakub Kicinski
2026-02-03 3:15 ` Li Chen
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