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Date:   Fri, 12 Oct 2018 00:58:02 -0700
From:   syzbot <syzbot+e326127852f785c44347@...kaller.appspotmail.com>
To:     davem@...emloft.net, dccp@...r.kernel.org, garsilva@...eddedor.com,
        gerrit@....abdn.ac.uk, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: BUG: please report to dccp@...r.kernel.org => prev = 5, last = 5 at net/dccp/ccids/lib/packet_history.c:LINE/tfrc_rx_his

Hello,

syzbot found the following crash on:

HEAD commit:    771b65e89c8a Add linux-next specific files for 20181011
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=167d2376400000
kernel config:  https://syzkaller.appspot.com/x/.config?x=45f1c06c4da0a925
dashboard link: https://syzkaller.appspot.com/bug?extid=e326127852f785c44347
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+e326127852f785c44347@...kaller.appspotmail.com

BUG: please report to dccp@...r.kernel.org => prev = 5, last = 5 at  
net/dccp/ccids/lib/packet_history.c:425/tfrc_rx_hist_sample_rtt()
CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 4.19.0-rc7-next-20181011+ #92
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+0x244/0x3ab lib/dump_stack.c:113
  tfrc_rx_hist_sample_rtt.cold.3+0x54/0x5c  
net/dccp/ccids/lib/packet_history.c:422
  ccid3_hc_rx_packet_recv+0x5c4/0xeb0 net/dccp/ccids/ccid3.c:767
  ccid_hc_rx_packet_recv net/dccp/ccid.h:185 [inline]
  dccp_deliver_input_to_ccids+0xf0/0x280 net/dccp/input.c:180
  dccp_rcv_established+0x87/0xb0 net/dccp/input.c:378
  dccp_v4_do_rcv+0x153/0x180 net/dccp/ipv4.c:656
  sk_backlog_rcv include/net/sock.h:932 [inline]
  __sk_receive_skb+0x3e0/0xeb0 net/core/sock.c:473
binder: send failed reply for transaction 41 to 27388:27389
  dccp_v4_rcv+0x10f9/0x1f58 net/dccp/ipv4.c:877
  ip_local_deliver_finish+0x2e9/0xda0 net/ipv4/ip_input.c:215
  NF_HOOK include/linux/netfilter.h:289 [inline]
  ip_local_deliver+0x1e4/0x740 net/ipv4/ip_input.c:256
  dst_input include/net/dst.h:450 [inline]
  ip_rcv_finish+0x1f9/0x300 net/ipv4/ip_input.c:415
  NF_HOOK include/linux/netfilter.h:289 [inline]
  ip_rcv+0xe8/0x600 net/ipv4/ip_input.c:524
  __netif_receive_skb_one_core+0x14d/0x200 net/core/dev.c:4908
  __netif_receive_skb+0x27/0x1e0 net/core/dev.c:5018
  process_backlog+0x24e/0x7a0 net/core/dev.c:5822
  napi_poll net/core/dev.c:6242 [inline]
  net_rx_action+0x7fa/0x19b0 net/core/dev.c:6308
  __do_softirq+0x30d/0xb26 kernel/softirq.c:292
  run_ksoftirqd+0x5e/0x100 kernel/softirq.c:654
  smpboot_thread_fn+0x68b/0xa00 kernel/smpboot.c:164
  kthread+0x35a/0x440 kernel/kthread.c:246
  ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
dccp_close: ABORT with 52224 bytes unread
binder: send failed reply for transaction 43 to 27399:27404
dccp_close: ABORT with 3584 bytes unread
binder: send failed reply for transaction 45 to 27417:27418
binder: send failed reply for transaction 47 to 27424:27425
dccp_close: ABORT with 105984 bytes unread
dccp_close: ABORT with 105984 bytes unread
dccp_close: ABORT with 105984 bytes unread
nf_conntrack: default automatic helper assignment has been turned off for  
security reasons and CT-based  firewall rule not found. Use the iptables CT  
target to attach helpers instead.
Dead loop on virtual device ip6_vti0, fix it urgently!
Dead loop on virtual device ip6_vti0, fix it urgently!
Dead loop on virtual device ip6_vti0, fix it urgently!
Dead loop on virtual device ip6_vti0, fix it urgently!
Dead loop on virtual device ip6_vti0, fix it urgently!
Dead loop on virtual device ip6_vti0, fix it urgently!
IPVS: sync thread started: state = BACKUP, mcast_ifn = team_slave_0, syncid  
= 0, id = 0
Dead loop on virtual device ip6_vti0, fix it urgently!
IPVS: sync thread started: state = BACKUP, mcast_ifn = team_slave_0, syncid  
= 0, id = 0
IPVS: ftp: loaded support on port[0] = 21
.: renamed from bpq0
IPVS: ftp: loaded support on port[0] = 21


---
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@...glegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with  
syzbot.

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