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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Joseph Salisbury <joseph.salisbury@oracle.com>
Cc: Steven Rostedt <rostedt@goodmis.org>, stable-rt@vger.kernel.org,
	Clark Williams <williams@redhat.com>
Subject: Re: [External] : Re: Please backport: netfilter: nft_counter: Use
 u64_stats_t for statistic.
Message-ID: <20241004073934.501MFrgf@linutronix.de>
References: <20240927155656.Z-s6BO9B@linutronix.de>
 <20240927144126.0dba172a@gandalf.local.home>
 <bab856cc-7c9f-4ee9-84f6-ab228b2648c0@oracle.com>
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In-Reply-To: <bab856cc-7c9f-4ee9-84f6-ab228b2648c0@oracle.com>

On 2024-09-27 15:01:00 [-0400], Joseph Salisbury wrote:
> Is it needed in all stable release patch sets, including v5.15?

Yes. I would appreciate backporting it all the way where the code is
available. The dependencies
	1eacdd71b3436 ("netfilter: nft_counter: Disable BH in nft_counter_offload_stats().")
	a0b39e2dc7017 ("netfilter: nft_counter: Synchronize nft_counter_reset() against reader.")

were already routed via stable.
The problem is that the seqcount has no lock associated so a reader
could preempt a writer and then lockup spinning.

Sebastian