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Miller" , David Ahern , Jakub Kicinski , Paolo Abeni , Simon Horman , Willem de Bruijn Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH net v2] net: ipv6: fix TCP GSO segmentation with NAT Message-ID: <202503120224.LbO66Ztw-lkp@intel.com> References: <20250310112121.73654-1-nbd@nbd.name> Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250310112121.73654-1-nbd@nbd.name> Hi Felix, kernel test robot noticed the following build warnings: [auto build test WARNING on net/main] url: https://github.com/intel-lab-lkp/linux/commits/Felix-Fietkau/net-ipv6-fix-TCP-GSO-segmentation-with-NAT/20250310-192256 base: net/main patch link: https://lore.kernel.org/r/20250310112121.73654-1-nbd%40nbd.name patch subject: [PATCH net v2] net: ipv6: fix TCP GSO segmentation with NAT config: s390-randconfig-001-20250312 (https://download.01.org/0day-ci/archive/20250312/202503120224.LbO66Ztw-lkp@intel.com/config) compiler: clang version 15.0.7 (https://github.com/llvm/llvm-project 8dfdcc7b7bf66834a761bd8de445840ef68e4d1a) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250312/202503120224.LbO66Ztw-lkp@intel.com/reproduce) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-kbuild-all/202503120224.LbO66Ztw-lkp@intel.com/ All warnings (new ones prefixed by >>): >> net/ipv6/tcpv6_offload.c:104:30: warning: variable 'th' is uninitialized when used here [-Wuninitialized] inet_proto_csum_replace16(&th->check, seg, ^~ net/ipv6/tcpv6_offload.c:101:19: note: initialize the variable 'th' to silence this warning struct tcphdr *th; ^ = NULL 1 warning generated. vim +/th +104 net/ipv6/tcpv6_offload.c 95 96 static void __tcpv6_gso_segment_csum(struct sk_buff *seg, 97 struct in6_addr *oldip, 98 const struct in6_addr *newip, 99 __be16 *oldport, __be16 newport) 100 { 101 struct tcphdr *th; 102 103 if (!ipv6_addr_equal(oldip, newip)) { > 104 inet_proto_csum_replace16(&th->check, seg, 105 oldip->s6_addr32, 106 newip->s6_addr32, 107 true); 108 *oldip = *newip; 109 } 110 111 if (*oldport == newport) 112 return; 113 114 th = tcp_hdr(seg); 115 inet_proto_csum_replace2(&th->check, seg, *oldport, newport, false); 116 *oldport = newport; 117 } 118 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki