From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 02274C432C3 for ; Mon, 18 Nov 2019 19:05:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D1D232063A for ; Mon, 18 Nov 2019 19:05:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726760AbfKRTFM (ORCPT ); Mon, 18 Nov 2019 14:05:12 -0500 Received: from mail-il1-f197.google.com ([209.85.166.197]:48508 "EHLO mail-il1-f197.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726423AbfKRTFL (ORCPT ); Mon, 18 Nov 2019 14:05:11 -0500 Received: by mail-il1-f197.google.com with SMTP id j68so17151337ili.15 for ; Mon, 18 Nov 2019 11:05:09 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=JN/WIzRL3xgiIAMfN7W4EDclVvEnXiBKfc2rvVhShA0=; b=X/I6bbEO7G64GunltTNI5Tlq5x2t1WyUrtKPcK18SZVdgczp7yVf9CefIsWaSd/+0Q Lf8yPWO/uGppWr543IlfcDVv5laLfqpgCWTCUPdqRq/oHL70iUCJ3vSz5Z72sCIeBjex COrdu7XriLD/5tkcl7JI90NyTXj4BKblqXGlR+dlxsMmCBZY8EJFdpoF6eK2eaUoemgy +Mpd7sACErEuztjp/P8iPaPqw9VyYglyCRGlVPRpO/aDS20O1puGraJya/0SoCEqOezK +Hx8ooyqp5BCrPExHVJWmpI6UN3AjGvkM2lE69vAKqgG/wOOgVMK6G0dHP3VVKSHfejI T1CA== X-Gm-Message-State: APjAAAWRdA8FKg4O+25jKyxWQaL91LjuTKeTIBDGg8mGhmgJqt3mBclC skseT3LwGlfO+Q4EXSiw1yd68+Lwe50agG64Ykne4Wdh6OR/ X-Google-Smtp-Source: APXvYqzQv3IIi/EFnLlvpMQdjMEXk2J9nVzgCVUHWEnLUbkGSRF3p8znLbD8SbilYWbLCnXsHJtBk7RT8Zz8xLBUcMmQ/qQ2wWkW MIME-Version: 1.0 X-Received: by 2002:a92:6611:: with SMTP id a17mr18116394ilc.208.1574103909400; Mon, 18 Nov 2019 11:05:09 -0800 (PST) Date: Mon, 18 Nov 2019 11:05:09 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000005c08d10597a3a05d@google.com> Subject: KMSAN: uninit-value in can_receive From: syzbot To: davem@davemloft.net, glider@google.com, linux-can@vger.kernel.org, linux-kernel@vger.kernel.org, mkl@pengutronix.de, netdev@vger.kernel.org, socketcan@hartkopp.net, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 9c6a7162 kmsan: remove unneeded annotations in bio git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=14563416e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=9e324dfe9c7b0360 dashboard link: https://syzkaller.appspot.com/bug?extid=b02ff0707a97e4e79ebb compiler: clang version 9.0.0 (/home/glider/llvm/clang 80fee25776c2fb61e74c1ecb1a523375c2500b69) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+b02ff0707a97e4e79ebb@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in can_receive+0x23c/0x5e0 net/can/af_can.c:649 CPU: 1 PID: 3490 Comm: syz-executor.2 Not tainted 5.4.0-rc5+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x191/0x1f0 lib/dump_stack.c:113 kmsan_report+0x128/0x220 mm/kmsan/kmsan_report.c:108 __msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:245 can_receive+0x23c/0x5e0 net/can/af_can.c:649 can_rcv+0x188/0x3a0 net/can/af_can.c:685 __netif_receive_skb_one_core net/core/dev.c:5010 [inline] __netif_receive_skb net/core/dev.c:5124 [inline] process_backlog+0x12e8/0x1410 net/core/dev.c:5955 napi_poll net/core/dev.c:6392 [inline] net_rx_action+0x7a6/0x1aa0 net/core/dev.c:6460 __do_softirq+0x4a1/0x83a kernel/softirq.c:293 do_softirq_own_stack+0x49/0x80 arch/x86/entry/entry_64.S:1093 do_softirq kernel/softirq.c:338 [inline] __local_bh_enable_ip+0x184/0x1d0 kernel/softirq.c:190 local_bh_enable+0x36/0x40 include/linux/bottom_half.h:32 rcu_read_unlock_bh include/linux/rcupdate.h:688 [inline] __dev_queue_xmit+0x38e8/0x4200 net/core/dev.c:3900 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3906 packet_snd net/packet/af_packet.c:2959 [inline] packet_sendmsg+0x82d7/0x92e0 net/packet/af_packet.c:2984 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg net/socket.c:657 [inline] ___sys_sendmsg+0x14ff/0x1590 net/socket.c:2311 __sys_sendmsg net/socket.c:2356 [inline] __do_sys_sendmsg net/socket.c:2365 [inline] __se_sys_sendmsg+0x305/0x460 net/socket.c:2363 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2363 do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x45a639 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ff1b9c14c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a639 RDX: 0000000000000050 RSI: 0000000020000100 RDI: 0000000000000003 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff1b9c156d4 R13: 00000000004c8acf R14: 00000000004df078 R15: 00000000ffffffff Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:151 [inline] kmsan_internal_poison_shadow+0x60/0x120 mm/kmsan/kmsan.c:134 kmsan_slab_alloc+0xaa/0x120 mm/kmsan/kmsan_hooks.c:88 slab_alloc_node mm/slub.c:2799 [inline] __kmalloc_node_track_caller+0xd7b/0x1390 mm/slub.c:4407 __kmalloc_reserve net/core/skbuff.c:141 [inline] __alloc_skb+0x306/0xa10 net/core/skbuff.c:209 alloc_skb include/linux/skbuff.h:1050 [inline] alloc_skb_with_frags+0x18c/0xa80 net/core/skbuff.c:5662 sock_alloc_send_pskb+0xafd/0x10a0 net/core/sock.c:2244 packet_alloc_skb net/packet/af_packet.c:2807 [inline] packet_snd net/packet/af_packet.c:2902 [inline] packet_sendmsg+0x6785/0x92e0 net/packet/af_packet.c:2984 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg net/socket.c:657 [inline] ___sys_sendmsg+0x14ff/0x1590 net/socket.c:2311 __sys_sendmsg net/socket.c:2356 [inline] __do_sys_sendmsg net/socket.c:2365 [inline] __se_sys_sendmsg+0x305/0x460 net/socket.c:2363 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2363 do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 ===================================================== --- This bug is generated by a bot. 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