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Wed, 21 Jul 2021 09:38:35 +0000 Date: Wed, 21 Jul 2021 12:38:11 +0300 From: Dan Carpenter To: kbuild@lists.01.org, John Fastabend , jakub@cloudflare.com, daniel@iogearbox.net, xiyou.wangcong@gmail.com, alexei.starovoitov@gmail.com Cc: lkp@intel.com, kbuild-all@lists.01.org, john.fastabend@gmail.com, bpf@vger.kernel.org, netdev@vger.kernel.org Subject: Re: [PATCH bpf 2/3] bpf, sockmap: on cleanup we additionally need to remove cached skb Message-ID: <202107201829.npSZIVc5-lkp@intel.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210719214834.125484-3-john.fastabend@gmail.com> User-Agent: Mutt/1.9.4 (2018-02-28) X-ClientProxiedBy: JNXP275CA0029.ZAFP275.PROD.OUTLOOK.COM (2603:1086:0:18::17) To MWHPR1001MB2365.namprd10.prod.outlook.com (2603:10b6:301:2d::28) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from kadam (102.222.70.252) by JNXP275CA0029.ZAFP275.PROD.OUTLOOK.COM (2603:1086:0:18::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4331.21 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?24HWf8KEgn2tj/ixDDYtsk2XrbR+914/5pQyXV68lV3nUYb0VSoKkHVo+/qt?= =?us-ascii?Q?M+UHsR3a16Q+07HOuZfBjggEfC2+hhR9gCaTfZ3j6N/pj/sVxpAfIOv/Jor3?= =?us-ascii?Q?mgUZ5EbndmVvHrMWnV/4I7s77bZNqkcQQ24GWmWd8JmcU4yD0hy/ZBhIh3f7?= =?us-ascii?Q?XF1l/ZiE7hR4l7hIksIDa3krnzZdaDD9asPxdxMoN5HmNJoYxk1eiCru0zRg?= =?us-ascii?Q?N/Js3ZmRwov8Sl0iLTnM+CtokIopziZGnR5WwmkNfT0P3B9ewLWeYkGUl2RT?= =?us-ascii?Q?JItWMUsevce+74hCphNnJ9/oQYU+P43EDmViV7UMUdY5tuUzy5hDU3w1fgWO?= =?us-ascii?Q?2N0lbEJMqTzLygi9/iYCyzcLYRReh9TOcaBDhX2qrOxzBhLeRfU2irNG0OHN?= =?us-ascii?Q?nKT9EDQKX2ipFnWGwY7q1obroXuMiMHQNfG+owc75P6dBwgmtST/tku1mBPQ?= =?us-ascii?Q?sfeRS4phPm6f8lETwSNfWwzD4/nSZ5AB6fL1R87YHes0DraUaNz2/RsuTpHV?= =?us-ascii?Q?Hah+rM7G4qxOrxg/HjxBplOeSL5TlR8QA0b3xxrqxM9YQdIyMrJs3qGNNB6i?= =?us-ascii?Q?UA5jPJyQNFwRHEfYfusjj17IvTVevP2ZsZSRZlfOJ33IbJgNWIgG0aCZry7u?= =?us-ascii?Q?jQfJ44pvuyHRFQRP//WlCu+s7oGa3NDl8TOmeRr0YlN8EaMAsOmqs8H3b0S8?= =?us-ascii?Q?EqhsZH4Ml8HeuMh3f3/EwCRrkDVQVSIvw9QQVl8T0WRcYN1SvMS5yJtoyPD4?= =?us-ascii?Q?nUHCv2DmtFDyPZ5S1TLeT5oEKslChS5scXzedm41FLtG1zmGQECxfFWTTQaP?= =?us-ascii?Q?384AUJ8rWJ7H+p+DnPxFtrALp2xd5+zolATi31ycVekBVN+mfv+HE6E0hq7U?= =?us-ascii?Q?dCqLGO0s1xkZHgibJWfiOjbJbdJOwIwa+3UPzbSq3ha5+aDUa2PTEzoUzjUS?= =?us-ascii?Q?UuAgg+DXdMyk78JNk2RZprl3ApIOm973wNHDbbMu0ixWVKZljI7sTod5YPc0?= =?us-ascii?Q?YzgMMNeioPHie/Z7MSPyOR6sRUyMfN67swJy+ONE/HUK+kGITZ1i02Rj7/Pm?= =?us-ascii?Q?9ums9HfLA85UYlHofR6A8X0wt5PGmlOwriQoPAqln2VzJHe/B2+SVlZEamVA?= =?us-ascii?Q?Fb5kFajmilDRGplBISCMuZBzlKyG02aRU9eqVGiczJH4cQYQscBPZG8T8hx/?= =?us-ascii?Q?Q4YMtboh47ZM3mqFRSUq8O0OMpdAlZ9xTu3Vqri2448am3CIsBcABEJo53EI?= =?us-ascii?Q?wDl+gS9l2E9ZSUOmZOdb2LpyAWbG/CHuefguT6unnbBB4G/P+vVGwZrZ5qwX?= =?us-ascii?Q?SZtPjCNAGZI4PAnf1lSFAufZ?= X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-Network-Message-Id: 9c246e2f-8088-4ec9-bd16-08d94c2b4f1b X-MS-Exchange-CrossTenant-AuthSource: MWHPR1001MB2365.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Jul 2021 09:38:34.9475 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: nN0LUQUFM7ETSSHrTriQmsiscrEfCqGHh591y7EEQwoaqIXiuSykvw5woiAKncbN0iK9hW7XAAp1zPgJsv/pXYpfp/RET4HdsJhv9FnxO9Q= X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR10MB1888 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=10051 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 mlxscore=0 malwarescore=0 adultscore=0 phishscore=0 suspectscore=0 mlxlogscore=999 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2104190000 definitions=main-2107210053 X-Proofpoint-GUID: Dj5J8d2_pmgCSRlBUxNgMYAgr0SYlf-I X-Proofpoint-ORIG-GUID: Dj5J8d2_pmgCSRlBUxNgMYAgr0SYlf-I Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hi John, url: https://github.com/0day-ci/linux/commits/John-Fastabend/sockmap-fixes-picked-up-by-stress-tests/20210720-144138 base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git master config: i386-randconfig-m021-20210720 (attached as .config) compiler: gcc-10 (Ubuntu 10.3.0-1ubuntu1~20.04) 10.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot Reported-by: Dan Carpenter smatch warnings: net/core/skmsg.c:627 sk_psock_backlog() error: uninitialized symbol 'skb'. net/core/skmsg.c:639 sk_psock_backlog() error: uninitialized symbol 'off'. net/core/skmsg.c:640 sk_psock_backlog() error: uninitialized symbol 'len'. vim +/skb +627 net/core/skmsg.c 604326b41a6fb9 Daniel Borkmann 2018-10-13 609 static void sk_psock_backlog(struct work_struct *work) 604326b41a6fb9 Daniel Borkmann 2018-10-13 610 { 604326b41a6fb9 Daniel Borkmann 2018-10-13 611 struct sk_psock *psock = container_of(work, struct sk_psock, work); 604326b41a6fb9 Daniel Borkmann 2018-10-13 612 struct sk_psock_work_state *state = &psock->work_state; 604326b41a6fb9 Daniel Borkmann 2018-10-13 613 struct sk_buff *skb; 604326b41a6fb9 Daniel Borkmann 2018-10-13 614 bool ingress; 604326b41a6fb9 Daniel Borkmann 2018-10-13 615 u32 len, off; 604326b41a6fb9 Daniel Borkmann 2018-10-13 616 int ret; 604326b41a6fb9 Daniel Borkmann 2018-10-13 617 799aa7f98d53e0 Cong Wang 2021-03-30 618 mutex_lock(&psock->work_mutex); d1f6b1c794e27f John Fastabend 2021-07-19 619 if (unlikely(state->skb)) { d1f6b1c794e27f John Fastabend 2021-07-19 620 spin_lock_bh(&psock->ingress_lock); 604326b41a6fb9 Daniel Borkmann 2018-10-13 621 skb = state->skb; 604326b41a6fb9 Daniel Borkmann 2018-10-13 622 len = state->len; 604326b41a6fb9 Daniel Borkmann 2018-10-13 623 off = state->off; 604326b41a6fb9 Daniel Borkmann 2018-10-13 624 state->skb = NULL; d1f6b1c794e27f John Fastabend 2021-07-19 625 spin_unlock_bh(&psock->ingress_lock); 604326b41a6fb9 Daniel Borkmann 2018-10-13 626 } skb uninitialized on else path. d1f6b1c794e27f John Fastabend 2021-07-19 @627 if (skb) d1f6b1c794e27f John Fastabend 2021-07-19 628 goto start; 604326b41a6fb9 Daniel Borkmann 2018-10-13 629 604326b41a6fb9 Daniel Borkmann 2018-10-13 630 while ((skb = skb_dequeue(&psock->ingress_skb))) { 604326b41a6fb9 Daniel Borkmann 2018-10-13 631 len = skb->len; 604326b41a6fb9 Daniel Borkmann 2018-10-13 632 off = 0; 604326b41a6fb9 Daniel Borkmann 2018-10-13 633 start: e3526bb92a2084 Cong Wang 2021-02-23 634 ingress = skb_bpf_ingress(skb); e3526bb92a2084 Cong Wang 2021-02-23 635 skb_bpf_redirect_clear(skb); 604326b41a6fb9 Daniel Borkmann 2018-10-13 636 do { 604326b41a6fb9 Daniel Borkmann 2018-10-13 637 ret = -EIO; 799aa7f98d53e0 Cong Wang 2021-03-30 638 if (!sock_flag(psock->sk, SOCK_DEAD)) 604326b41a6fb9 Daniel Borkmann 2018-10-13 @639 ret = sk_psock_handle_skb(psock, skb, off, 604326b41a6fb9 Daniel Borkmann 2018-10-13 @640 len, ingress); 604326b41a6fb9 Daniel Borkmann 2018-10-13 641 if (ret <= 0) { 604326b41a6fb9 Daniel Borkmann 2018-10-13 642 if (ret == -EAGAIN) { d1f6b1c794e27f John Fastabend 2021-07-19 643 sk_psock_skb_state(psock, state, skb, d1f6b1c794e27f John Fastabend 2021-07-19 644 len, off); 604326b41a6fb9 Daniel Borkmann 2018-10-13 645 goto end; 604326b41a6fb9 Daniel Borkmann 2018-10-13 646 } 604326b41a6fb9 Daniel Borkmann 2018-10-13 647 /* Hard errors break pipe and stop xmit. */ 604326b41a6fb9 Daniel Borkmann 2018-10-13 648 sk_psock_report_error(psock, ret ? -ret : EPIPE); 604326b41a6fb9 Daniel Borkmann 2018-10-13 649 sk_psock_clear_state(psock, SK_PSOCK_TX_ENABLED); 781dd0431eb549 Cong Wang 2021-06-14 650 sock_drop(psock->sk, skb); 604326b41a6fb9 Daniel Borkmann 2018-10-13 651 goto end; 604326b41a6fb9 Daniel Borkmann 2018-10-13 652 } 604326b41a6fb9 Daniel Borkmann 2018-10-13 653 off += ret; 604326b41a6fb9 Daniel Borkmann 2018-10-13 654 len -= ret; 604326b41a6fb9 Daniel Borkmann 2018-10-13 655 } while (len); 604326b41a6fb9 Daniel Borkmann 2018-10-13 656 604326b41a6fb9 Daniel Borkmann 2018-10-13 657 if (!ingress) 604326b41a6fb9 Daniel Borkmann 2018-10-13 658 kfree_skb(skb); 604326b41a6fb9 Daniel Borkmann 2018-10-13 659 } 604326b41a6fb9 Daniel Borkmann 2018-10-13 660 end: 799aa7f98d53e0 Cong Wang 2021-03-30 661 mutex_unlock(&psock->work_mutex); 604326b41a6fb9 Daniel Borkmann 2018-10-13 662 } --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org