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[81.185.174.91]) by smtp.gmail.com with ESMTPSA id i18sm138193910wrp.91.2019.08.13.07.20.34 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 13 Aug 2019 07:20:35 -0700 (PDT) Subject: Re: KMSAN: uninit-value in nh_valid_get_del_req To: syzbot , davem@davemloft.net, dsahern@kernel.org, glider@google.com, kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, yoshfuji@linux-ipv6.org References: <000000000000d7edc0058fffe31a@google.com> From: Eric Dumazet Message-ID: Date: Tue, 13 Aug 2019 16:20:33 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <000000000000d7edc0058fffe31a@google.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On 8/13/19 3:48 PM, syzbot wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit:    61ccdad1 Revert "drm/bochs: Use shadow buffer for bochs fr.. > git tree:       https://github.com/google/kmsan.git master > console output: https://syzkaller.appspot.com/x/log.txt?x=14c120e2600000 > kernel config:  https://syzkaller.appspot.com/x/.config?x=27abc558ecb16a3b > dashboard link: https://syzkaller.appspot.com/bug?extid=86ec9d8c02c07571873c > compiler:       clang version 9.0.0 (/home/glider/llvm/clang 80fee25776c2fb61e74c1ecb1a523375c2500b69) > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15ed6c4a600000 > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11de024a600000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+86ec9d8c02c07571873c@syzkaller.appspotmail.com > > ================================================================== > BUG: KMSAN: uninit-value in nh_valid_get_del_req+0x6f1/0x8c0 net/ipv4/nexthop.c:1510 > CPU: 0 PID: 11812 Comm: syz-executor444 Not tainted 5.3.0-rc3+ #17 > 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+0x162/0x2d0 mm/kmsan/kmsan_report.c:109 >  __msan_warning+0x75/0xe0 mm/kmsan/kmsan_instr.c:294 >  nh_valid_get_del_req+0x6f1/0x8c0 net/ipv4/nexthop.c:1510 >  rtm_del_nexthop+0x1b1/0x610 net/ipv4/nexthop.c:1543 >  rtnetlink_rcv_msg+0x115a/0x1580 net/core/rtnetlink.c:5223 >  netlink_rcv_skb+0x431/0x620 net/netlink/af_netlink.c:2477 >  rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:5241 >  netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] >  netlink_unicast+0xf6c/0x1050 net/netlink/af_netlink.c:1328 >  netlink_sendmsg+0x110f/0x1330 net/netlink/af_netlink.c:1917 >  sock_sendmsg_nosec net/socket.c:637 [inline] >  sock_sendmsg net/socket.c:657 [inline] >  ___sys_sendmsg+0x14ff/0x1590 net/socket.c:2311 >  __sys_sendmmsg+0x53a/0xae0 net/socket.c:2413 >  __do_sys_sendmmsg net/socket.c:2442 [inline] >  __se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2439 >  __x64_sys_sendmmsg+0x56/0x70 net/socket.c:2439 >  do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:297 >  entry_SYSCALL_64_after_hwframe+0x63/0xe7 > RIP: 0033:0x440259 > Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 > RSP: 002b:00007fff15f10d08 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 > RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 0000000000440259 > RDX: 0492492492492805 RSI: 0000000020000140 RDI: 0000000000000003 > RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401ae0 > R13: 0000000000401b70 R14: 0000000000000000 R15: 0000000000000000 > > Uninit was created at: >  kmsan_save_stack_with_flags mm/kmsan/kmsan.c:187 [inline] >  kmsan_internal_poison_shadow+0x53/0xa0 mm/kmsan/kmsan.c:146 >  kmsan_slab_alloc+0xaa/0x120 mm/kmsan/kmsan_hooks.c:175 >  slab_alloc_node mm/slub.c:2790 [inline] >  __kmalloc_node_track_caller+0xb55/0x1320 mm/slub.c:4388 >  __kmalloc_reserve net/core/skbuff.c:141 [inline] >  __alloc_skb+0x306/0xa10 net/core/skbuff.c:209 >  alloc_skb include/linux/skbuff.h:1056 [inline] >  netlink_alloc_large_skb net/netlink/af_netlink.c:1174 [inline] >  netlink_sendmsg+0x783/0x1330 net/netlink/af_netlink.c:1892 >  sock_sendmsg_nosec net/socket.c:637 [inline] >  sock_sendmsg net/socket.c:657 [inline] >  ___sys_sendmsg+0x14ff/0x1590 net/socket.c:2311 >  __sys_sendmmsg+0x53a/0xae0 net/socket.c:2413 >  __do_sys_sendmmsg net/socket.c:2442 [inline] >  __se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2439 >  __x64_sys_sendmmsg+0x56/0x70 net/socket.c:2439 >  do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:297 >  entry_SYSCALL_64_after_hwframe+0x63/0xe7 > ================================================================== > > > --- > This bug is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@googlegroups.com. > > syzbot will keep track of this bug report. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > syzbot can test patches for this bug, for details see: > https://goo.gl/tpsmEJ#testing-patches Fix is under review https://patchwork.ozlabs.org/patch/1145879/