From mboxrd@z Thu Jan 1 00:00:00 1970 From: syzbot Subject: invalid opcode in ip_do_fragment Date: Thu, 22 Nov 2018 10:03:02 -0800 Message-ID: <00000000000085abf7057b44ad08@google.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes To: davem@davemloft.net, kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, yoshfuji@linux-ipv6.org Return-path: Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 92b419289cee Merge tag 'riscv-for-linus-4.20-rc4' of git:/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12243093400000 kernel config: https://syzkaller.appspot.com/x/.config?x=73e2bc0cb6463446 dashboard link: https://syzkaller.appspot.com/bug?extid=865704dc4f7ff5d1a04b compiler: gcc (GCC) 8.0.1 20180413 (experimental) 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+865704dc4f7ff5d1a04b@syzkaller.appspotmail.com invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 21078 Comm: syz-executor1 Not tainted 4.20.0-rc3+ #344 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ip_do_fragment+0x2447/0x2ad0 net/ipv4/ip_output.c:776 Code: ff 48 89 cf e8 2a 36 23 fb e9 dc ea ff ff 48 89 df e8 5d 36 23 fb e9 02 e7 ff ff e8 b3 36 23 fb e9 97 e6 ff ff e8 29 e7 df fa <0f> 0b 4c 89 f7 e8 ff 35 23 fb e9 2f e6 ff ff 4c 89 e7 e8 f2 35 23 RSP: 0018:ffff88818232e7b8 EFLAGS: 00010246 RAX: 0000000000040000 RBX: ffff8881d3af0800 RCX: ffffc9000c0db000 RDX: 0000000000040000 RSI: ffffffff869fa3c7 RDI: 0000000000000005 RBP: ffff88818232e990 R08: ffff88816ba06580 R09: ffffed10342f86ca R10: ffffed10342f86cc R11: ffff8881a17c3663 R12: ffff8881d3af08c4 R13: 00000000fffffff2 R14: ffff8881d3af08d0 R15: dffffc0000000000 FS: 00007fa003fcd700(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000004ccd10 CR3: 0000000199f89000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ip_fragment.constprop.50+0x179/0x240 net/ipv4/ip_output.c:549 ip_finish_output+0x6b4/0xfa0 net/ipv4/ip_output.c:315 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip_output+0x21d/0x8d0 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:444 [inline] ip_local_out+0xc5/0x1b0 net/ipv4/ip_output.c:124 iptunnel_xmit+0x63b/0x9c0 net/ipv4/ip_tunnel_core.c:91 ip_tunnel_xmit+0x15b8/0x3c04 net/ipv4/ip_tunnel.c:787 __gre_xmit+0x5e1/0x980 net/ipv4/ip_gre.c:451 ipgre_xmit+0x3e7/0xba0 net/ipv4/ip_gre.c:705 __netdev_start_xmit include/linux/netdevice.h:4356 [inline] netdev_start_xmit include/linux/netdevice.h:4365 [inline] xmit_one net/core/dev.c:3252 [inline] dev_hard_start_xmit+0x295/0xc80 net/core/dev.c:3268 __dev_queue_xmit+0x2f71/0x3ad0 net/core/dev.c:3838 dev_queue_xmit+0x17/0x20 net/core/dev.c:3871 __bpf_tx_skb net/core/filter.c:2017 [inline] __bpf_redirect_common net/core/filter.c:2055 [inline] __bpf_redirect+0x5cf/0xb20 net/core/filter.c:2062 ____bpf_clone_redirect net/core/filter.c:2095 [inline] bpf_clone_redirect+0x2f6/0x490 net/core/filter.c:2067 bpf_prog_bebbfe2050753572+0x7dd/0x1000 Modules linked in: ---[ end trace 0d51d2ed64b21356 ]--- RIP: 0010:ip_do_fragment+0x2447/0x2ad0 net/ipv4/ip_output.c:776 Code: ff 48 89 cf e8 2a 36 23 fb e9 dc ea ff ff 48 89 df e8 5d 36 23 fb e9 02 e7 ff ff e8 b3 36 23 fb e9 97 e6 ff ff e8 29 e7 df fa <0f> 0b 4c 89 f7 e8 ff 35 23 fb e9 2f e6 ff ff 4c 89 e7 e8 f2 35 23 RSP: 0018:ffff88818232e7b8 EFLAGS: 00010246 RAX: 0000000000040000 RBX: ffff8881d3af0800 RCX: ffffc9000c0db000 RDX: 0000000000040000 RSI: ffffffff869fa3c7 RDI: 0000000000000005 RBP: ffff88818232e990 R08: ffff88816ba06580 R09: ffffed10342f86ca R10: ffffed10342f86cc R11: ffff8881a17c3663 R12: ffff8881d3af08c4 R13: 00000000fffffff2 R14: ffff8881d3af08d0 R15: dffffc0000000000 FS: 00007fa003fcd700(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000004ccd10 CR3: 0000000199f89000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- 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#bug-status-tracking for how to communicate with syzbot.