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Wed, 19 Jun 2019 12:35:09 -0400 (EDT) Date: Wed, 19 Jun 2019 19:35:07 +0300 From: Ido Schimmel To: syzbot Cc: davem@davemloft.net, dsahern@gmail.com, idosch@mellanox.com, jiri@mellanox.com, kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, yoshfuji@linux-ipv6.org Subject: Re: general protection fault in call_fib6_multipath_entry_notifiers Message-ID: <20190619163507.GA2080@splinter> References: <0000000000004237d7058baf24e3@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0000000000004237d7058baf24e3@google.com> User-Agent: Mutt/1.11.3 (2019-02-01) Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Wed, Jun 19, 2019 at 08:47:07AM -0700, syzbot wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: 39f58860 net/mlx5: add missing void argument to function m.. > git tree: net-next > console output: https://syzkaller.appspot.com/x/log.txt?x=115eb99ea00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=4937094fc643655f > dashboard link: https://syzkaller.appspot.com/bug?extid=382566d339d52cd1a204 > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=120c9e11a00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=120c3d21a00000 > > The bug was bisected to: > > commit ebee3cad835f7fe7250213225cf6d62c7cf3b2ca > Author: Ido Schimmel > Date: Tue Jun 18 15:12:48 2019 +0000 > > ipv6: Add IPv6 multipath notifications for add / replace > > bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1529970aa00000 > final crash: https://syzkaller.appspot.com/x/report.txt?x=1729970aa00000 > console output: https://syzkaller.appspot.com/x/log.txt?x=1329970aa00000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+382566d339d52cd1a204@syzkaller.appspotmail.com > Fixes: ebee3cad835f ("ipv6: Add IPv6 multipath notifications for add / > replace") > > kasan: CONFIG_KASAN_INLINE enabled > kasan: GPF could be caused by NULL-ptr deref or user memory access > general protection fault: 0000 [#1] PREEMPT SMP KASAN > CPU: 0 PID: 9190 Comm: syz-executor149 Not tainted 5.2.0-rc5+ #38 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > RIP: 0010:call_fib6_multipath_entry_notifiers+0xd1/0x1a0 Did not consider the case where RTA_MULTIPATH does not encode valid nexthop information in which case 'rt_notif' can be NULL. Will send a fix after I run some tests. > net/ipv6/ip6_fib.c:396 > Code: 8b b5 30 ff ff ff 48 c7 85 68 ff ff ff 00 00 00 00 48 c7 85 70 ff ff > ff 00 00 00 00 89 45 88 4c 89 e0 48 c1 e8 03 4c 89 65 80 <42> 80 3c 28 00 0f > 85 9a 00 00 00 48 b8 00 00 00 00 00 fc ff df 4d > RSP: 0018:ffff88809788f2c0 EFLAGS: 00010246 > RAX: 0000000000000000 RBX: 1ffff11012f11e59 RCX: 00000000ffffffff > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: ffff88809788f390 R08: ffff88809788f8c0 R09: 000000000000000c > R10: ffff88809788f5d8 R11: ffff88809788f527 R12: 0000000000000000 > R13: dffffc0000000000 R14: ffff88809788f8c0 R15: ffffffff89541d80 > FS: 000055555632c880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000020000080 CR3: 000000009ba7c000 CR4: 00000000001406f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > ip6_route_multipath_add+0xc55/0x1490 net/ipv6/route.c:5094 > inet6_rtm_newroute+0xed/0x180 net/ipv6/route.c:5208 > rtnetlink_rcv_msg+0x463/0xb00 net/core/rtnetlink.c:5219 > netlink_rcv_skb+0x177/0x450 net/netlink/af_netlink.c:2477 > rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:5237 > netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] > netlink_unicast+0x531/0x710 net/netlink/af_netlink.c:1328 > netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1917 > sock_sendmsg_nosec net/socket.c:646 [inline] > sock_sendmsg+0xd7/0x130 net/socket.c:665 > ___sys_sendmsg+0x803/0x920 net/socket.c:2286 > __sys_sendmsg+0x105/0x1d0 net/socket.c:2324 > __do_sys_sendmsg net/socket.c:2333 [inline] > __se_sys_sendmsg net/socket.c:2331 [inline] > __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2331 > do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x4401f9 > 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:00007ffc09fd0028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e > RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 00000000004401f9 > RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000003 > RBP: 00000000006ca018 R08: 0000000000000000 R09: 00000000004002c8 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000401a80 > R13: 0000000000401b10 R14: 0000000000000000 R15: 0000000000000000 > Modules linked in: > ---[ end trace 77949df4cfac115c ]--- > RIP: 0010:call_fib6_multipath_entry_notifiers+0xd1/0x1a0 > net/ipv6/ip6_fib.c:396 > Code: 8b b5 30 ff ff ff 48 c7 85 68 ff ff ff 00 00 00 00 48 c7 85 70 ff ff > ff 00 00 00 00 89 45 88 4c 89 e0 48 c1 e8 03 4c 89 65 80 <42> 80 3c 28 00 0f > 85 9a 00 00 00 48 b8 00 00 00 00 00 fc ff df 4d > RSP: 0018:ffff88809788f2c0 EFLAGS: 00010246 > RAX: 0000000000000000 RBX: 1ffff11012f11e59 RCX: 00000000ffffffff > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: ffff88809788f390 R08: ffff88809788f8c0 R09: 000000000000000c > R10: ffff88809788f5d8 R11: ffff88809788f527 R12: 0000000000000000 > R13: dffffc0000000000 R14: ffff88809788f8c0 R15: ffffffff89541d80 > FS: 000055555632c880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000020000080 CR3: 000000009ba7c000 CR4: 00000000001406f0 > 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#status for how to communicate with syzbot. > For information about bisection process see: https://goo.gl/tpsmEJ#bisection > syzbot can test patches for this bug, for details see: > https://goo.gl/tpsmEJ#testing-patches