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15.21.0202.014; Mon, 13 Jul 2026 09:43:07 +0000 Message-ID: <8f58111e-f66e-476c-8a22-2017a02475a6@windriver.com> Date: Mon, 13 Jul 2026 17:42:58 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] net: gre: fix lltx regression for GRE tunnels with SEQ/CSUM To: Ido Schimmel Cc: dsahern@kernel.org, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, horms@kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260709105243.864835-1-yun.zhou@windriver.com> <20260713085325.GA472073@shredder> Content-Language: en-US From: "Zhou, Yun" In-Reply-To: <20260713085325.GA472073@shredder> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SEWP216CA0132.KORP216.PROD.OUTLOOK.COM (2603:1096:101:2c0::18) To CH0PR11MB5332.namprd11.prod.outlook.com (2603:10b6:610:bf::17) Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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7/13/26 16:53, Ido Schimmel wrote: > > Patch prefix should be [PATCH net]: > > https://docs.kernel.org/process/maintainer-netdev.html > > On Thu, Jul 09, 2026 at 06:52:43PM +0800, Yun Zhou wrote: >> Before commit 00d066a4d4ed ("netdev_features: convert NETIF_F_LLTX to >> dev->lltx"), NETIF_F_LLTX was set unconditionally in __gre_tunnel_init() >> alongside GRE_FEATURES: >> >> dev->features |= GRE_FEATURES | NETIF_F_LLTX; >> >> When that commit converted NETIF_F_LLTX to the dev->lltx flag, it >> placed 'dev->lltx = true' after the SEQ/CSUM early returns instead >> of before them. This causes GRE/GRETAP tunnels with SEQ or CSUM+encap >> to lose lockless TX, reintroducing _xmit_lock acquisition around their >> ndo_start_xmit. Since GRE xmit re-enters the stack via >> ip_tunnel_xmit(), holding _xmit_lock risks ABBA deadlock with the >> underlay device. >> >> CPU0 CPU1 >> ---- ---- >> lock(&qdisc_xmit_lock_key#6); >> lock(&qdisc_xmit_lock_key#3); >> lock(&qdisc_xmit_lock_key#6); >> lock(&qdisc_xmit_lock_key#3); >> >> Fix by moving dev->lltx = true before the early returns, restoring >> the original unconditional behavior. >> >> Fixes: 00d066a4d4ed ("netdev_features: convert NETIF_F_LLTX to dev->lltx") > > Both sashiko instances indicate that this commit introduced the same bug > in ip6gre_tnl_init_features(). Please perform the same fix there and > fold it into v2. > Thanks a lot for your review. IPv6 indeed has the same issue. I will fix it in v2 as you suggested. BR, Yun