From: "Ahmed S. Darwish" <a.darwish@linutronix.de>
To: Varad Gautam <varad.gautam@suse.com>
Cc: linux-kernel@vger.kernel.org,
linux-rt-users <linux-rt-users@vger.kernel.org>,
netdev@vger.kernel.org, stable@vger.kernel.org,
Steffen Klassert <steffen.klassert@secunet.com>,
Herbert Xu <herbert@gondor.apana.org.au>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>, Florian Westphal <fw@strlen.de>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>
Subject: Re: [PATCH v2] xfrm: policy: Read seqcount outside of rcu-read side in xfrm_policy_lookup_bytype
Date: Fri, 28 May 2021 18:44:37 +0200 [thread overview]
Message-ID: <YLEd9RS8Cebjv2ho@lx-t490> (raw)
In-Reply-To: <20210528160407.32127-1-varad.gautam@suse.com>
On Fri, May 28, 2021, Varad Gautam wrote:
>
> Thead 1 (xfrm_hash_resize) Thread 2 (xfrm_policy_lookup_bytype)
>
> rcu_read_lock();
> mutex_lock(&hash_resize_mutex);
> read_seqcount_begin(&xfrm_policy_hash_generation);
> mutex_lock(&hash_resize_mutex); // block
> xfrm_bydst_resize();
> synchronize_rcu(); // block
> <RCU stalls in xfrm_policy_lookup_bytype>
>
...
>
> Fixes: 77cc278f7b20 ("xfrm: policy: Use sequence counters with associated lock")
> Signed-off-by: Varad Gautam <varad.gautam@suse.com>
Acked-by: Ahmed S. Darwish <a.darwish@linutronix.de>
next prev parent reply other threads:[~2021-05-28 16:45 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-28 12:03 [PATCH] xfrm: policy: Read seqcount outside of rcu-read side in xfrm_policy_lookup_bytype Varad Gautam
2021-05-28 15:11 ` Ahmed S. Darwish
2021-05-28 16:06 ` Varad Gautam
2021-05-28 16:04 ` [PATCH v2] " Varad Gautam
2021-05-28 16:44 ` Ahmed S. Darwish [this message]
2021-06-03 8:16 ` Steffen Klassert
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=YLEd9RS8Cebjv2ho@lx-t490 \
--to=a.darwish@linutronix.de \
--cc=davem@davemloft.net \
--cc=fw@strlen.de \
--cc=herbert@gondor.apana.org.au \
--cc=kuba@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-rt-users@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=peterz@infradead.org \
--cc=stable@vger.kernel.org \
--cc=steffen.klassert@secunet.com \
--cc=varad.gautam@suse.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.