netdev - BUG: unable to handle kernel paging request in iptunnel

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Date:   Fri, 21 Dec 2018 00:38:03 -0800
From:   syzbot <syzbot+61816a2458fec4918227@...kaller.appspotmail.com>
To:     davem@...emloft.net, kuznet@....inr.ac.ru,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, yoshfuji@...ux-ipv6.org
Subject: BUG: unable to handle kernel paging request in iptunnel_xmit

Hello,

syzbot found the following crash on:

HEAD commit:    d84e7bc0595a rds: Fix warning.
git tree:       net
console output: https://syzkaller.appspot.com/x/log.txt?x=14615435400000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c8970c89a0efbb23
dashboard link: https://syzkaller.appspot.com/bug?extid=61816a2458fec4918227
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+61816a2458fec4918227@...kaller.appspotmail.com

netlink: 8 bytes leftover after parsing attributes in process  
`syz-executor4'.
ip_tunnel: non-ECT from 172.20.255.187 with TOS=0x3
Enabling of bearer <udp:syz1> rejected, already enabled
netlink: 8 bytes leftover after parsing attributes in process  
`syz-executor4'.
New replicast peer: 172.20.20.187
BUG: unable to handle kernel paging request at ffffde2071b70933
PGD 0 P4D 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 30871 Comm: syz-executor3 Not tainted 4.20.0-rc6+ #241
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
RIP: 0010:iptunnel_xmit_stats include/net/ip_tunnels.h:422 [inline]
RIP: 0010:iptunnel_xmit+0x795/0x9c0 net/ipv4/ip_tunnel_core.c:94
Code: e9 03 80 3c 11 00 0f 85 00 02 00 00 4c 03 24 c5 20 40 27 89 48 b8 00  
00 00 00 00 fc ff df 49 8d 7c 24 18 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f  
85 ea 01 00 00 49 8d 7c 24 10 48 63 db 48 b8 00 00
RSP: 0018:ffff8881569becd0 EFLAGS: 00010a06
kobject: 'loop4' (00000000a27d9137): kobject_uevent_env
RAX: dffffc0000000000 RBX: 00000000000000dc RCX: 1ffffffff124e805
kobject: 'loop4' (00000000a27d9137): fill_kobj_path: path  
= '/devices/virtual/block/loop4'
RDX: 1fffe22071b70933 RSI: ffffffff83933588 RDI: ffff11038db84998
RBP: ffff8881569bed30 R08: ffff88818d334500 R09: ffffed103b5e5b5f
R10: ffffed103b5e5b5f R11: ffff8881daf2dafb R12: ffff11038db84980
R13: ffff8881bbe64ec0 R14: ffff8881baab7900 R15: ffff88818fbe8380
FS:  00007fef14ce2700(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffde2071b70933 CR3: 00000001af822000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
  udp_tunnel_xmit_skb+0x248/0x320 net/ipv4/udp_tunnel.c:182
  tipc_udp_xmit.isra.14+0xaaf/0xef0 net/tipc/udp_media.c:181
  tipc_udp_send_msg+0x391/0x670 net/tipc/udp_media.c:247
  tipc_bearer_xmit_skb+0x171/0x350 net/tipc/bearer.c:502
  tipc_enable_bearer+0xc5e/0xf10 net/tipc/bearer.c:327
kobject: 'loop2' (00000000d7ca5ab8): kobject_uevent_env
  __tipc_nl_bearer_enable+0x37c/0x4a0 net/tipc/bearer.c:897
kobject: 'loop2' (00000000d7ca5ab8): fill_kobj_path: path  
= '/devices/virtual/block/loop2'
  tipc_nl_bearer_enable+0x22/0x30 net/tipc/bearer.c:905
  genl_family_rcv_msg+0x8a7/0x11a0 net/netlink/genetlink.c:601
kobject: 'loop1' (00000000c9d8a67f): kobject_uevent_env
  genl_rcv_msg+0xc6/0x168 net/netlink/genetlink.c:626
  netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2477
  genl_rcv+0x28/0x40 net/netlink/genetlink.c:637
kobject: 'loop1' (00000000c9d8a67f): fill_kobj_path: path  
= '/devices/virtual/block/loop1'
  netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
  netlink_unicast+0x5a5/0x760 net/netlink/af_netlink.c:1336
  netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1917
  sock_sendmsg_nosec net/socket.c:621 [inline]
  sock_sendmsg+0xd5/0x120 net/socket.c:631
  ___sys_sendmsg+0x7fd/0x930 net/socket.c:2116
  __sys_sendmsg+0x11d/0x280 net/socket.c:2154
  __do_sys_sendmsg net/socket.c:2163 [inline]
  __se_sys_sendmsg net/socket.c:2161 [inline]
  __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161
  do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457669
Code: fd b3 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fef14ce1c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457669
RDX: 0000000000000000 RSI: 00000000200003c0 RDI: 0000000000000004
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fef14ce26d4
R13: 00000000004c4252 R14: 00000000004d71d0 R15: 00000000ffffffff
Modules linked in:
CR2: ffffde2071b70933
---[ end trace bf7dbdfd80cac9f4 ]---
RIP: 0010:iptunnel_xmit_stats include/net/ip_tunnels.h:422 [inline]
RIP: 0010:iptunnel_xmit+0x795/0x9c0 net/ipv4/ip_tunnel_core.c:94
Code: e9 03 80 3c 11 00 0f 85 00 02 00 00 4c 03 24 c5 20 40 27 89 48 b8 00  
00 00 00 00 fc ff df 49 8d 7c 24 18 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f  
85 ea 01 00 00 49 8d 7c 24 10 48 63 db 48 b8 00 00
RSP: 0018:ffff8881569becd0 EFLAGS: 00010a06
RAX: dffffc0000000000 RBX: 00000000000000dc RCX: 1ffffffff124e805
RDX: 1fffe22071b70933 RSI: ffffffff83933588 RDI: ffff11038db84998
RBP: ffff8881569bed30 R08: ffff88818d334500 R09: ffffed103b5e5b5f
R10: ffffed103b5e5b5f R11: ffff8881daf2dafb R12: ffff11038db84980
R13: ffff8881bbe64ec0 R14: ffff8881baab7900 R15: ffff88818fbe8380
FS:  00007fef14ce2700(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffde2071b70933 CR3: 00000001af822000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This bug is generated by a bot. It may contain errors.
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