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Date:   Tue, 26 Feb 2019 16:42:16 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     syzbot <syzbot+3c8a843d9de82272915b@...kaller.appspotmail.com>
Cc:     davem@...emloft.net, dccp@...r.kernel.org, gerrit@....abdn.ac.uk,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: BUG: please report to dccp@...r.kernel.org => prev = 10, last =
 10 at net/dccp/ccids/lib/packet_history.c:LINE/tfrc_rx_h

On Thu, Dec 20, 2018 at 02:55:03AM -0800, syzbot wrote:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    6531e115b7ab Merge branch 'akpm' (patches from Andrew)
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=13b0bd5d400000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=c8970c89a0efbb23
> dashboard link: https://syzkaller.appspot.com/bug?extid=3c8a843d9de82272915b
> 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+3c8a843d9de82272915b@...kaller.appspotmail.com
> 
> bond0: enslaved VLAN challenged slave lo. Adding VLANs will be blocked as
> long as lo is part of bond bond0
> bond0: lo is up - this may be due to an out of date ifenslave
> A link change request failed with some changes committed already. Interface
> lo may have been left with an inconsistent configuration, please check.
> BUG: please report to dccp@...r.kernel.org => prev = 10, last = 10 at
> net/dccp/ccids/lib/packet_history.c:425/tfrc_rx_hist_sample_rtt()
> CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 4.20.0-rc6+ #374
> 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+0x244/0x39d 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+0x3e5/0xec0 net/core/sock.c:473
>  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+0x1e9/0x750 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+0xed/0x600 net/ipv4/ip_input.c:524
>  __netif_receive_skb_one_core+0x14d/0x200 net/core/dev.c:4946
>  __netif_receive_skb+0x2c/0x1e0 net/core/dev.c:5056
>  process_backlog+0x24e/0x7a0 net/core/dev.c:5864
>  napi_poll net/core/dev.c:6287 [inline]
>  net_rx_action+0x7fa/0x19b0 net/core/dev.c:6353
>  __do_softirq+0x308/0xb7e 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
> IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
> IPVS: ftp: loaded support on port[0] = 21
> dccp_close: ABORT with 36864 bytes unread
> bond0: enslaved VLAN challenged slave lo. Adding VLANs will be blocked as
> long as lo is part of bond bond0
> bond0: lo is up - this may be due to an out of date ifenslave
> A link change request failed with some changes committed already. Interface
> lo may have been left with an inconsistent configuration, please check.
> IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
> IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
> bond0: enslaved VLAN challenged slave lo. Adding VLANs will be blocked as
> long as lo is part of bond bond0
> bond0: lo is up - this may be due to an out of date ifenslave
> A link change request failed with some changes committed already. Interface
> lo may have been left with an inconsistent configuration, please check.
> IPVS: ftp: loaded support on port[0] = 21
> bond0: enslaved VLAN challenged slave lo. Adding VLANs will be blocked as
> long as lo is part of bond bond0
> bond0: lo is up - this may be due to an out of date ifenslave
> A link change request failed with some changes committed already. Interface
> lo may have been left with an inconsistent configuration, please check.
> IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
> IPVS: ftp: loaded support on port[0] = 21
> IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
> bond0: enslaved VLAN challenged slave lo. Adding VLANs will be blocked as
> long as lo is part of bond bond0
> bond0: lo is up - this may be due to an out of date ifenslave
> A link change request failed with some changes committed already. Interface
> lo may have been left with an inconsistent configuration, please check.
> IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
> bond0: enslaved VLAN challenged slave lo. Adding VLANs will be blocked as
> long as lo is part of bond bond0
> bond0: lo is up - this may be due to an out of date ifenslave
> IPVS: ftp: loaded support on port[0] = 21
> A link change request failed with some changes committed already. Interface
> lo may have been left with an inconsistent configuration, please check.
> IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
> bond0: enslaved VLAN challenged slave lo. Adding VLANs will be blocked as
> long as lo is part of bond bond0
> bond0: lo is up - this may be due to an out of date ifenslave
> A link change request failed with some changes committed already. Interface
> lo may have been left with an inconsistent configuration, please check.
> IPVS: ftp: loaded support on port[0] = 21
> IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
> bond0: enslaved VLAN challenged slave lo. Adding VLANs will be blocked as
> long as lo is part of bond bond0
> bond0: lo is up - this may be due to an out of date ifenslave
> IPVS: ftp: loaded support on port[0] = 21
> A link change request failed with some changes committed already. Interface
> lo may have been left with an inconsistent configuration, please check.
> IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
> IPVS: ftp: loaded support on port[0] = 21
> IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
> bond0: enslaved VLAN challenged slave lo. Adding VLANs will be blocked as
> long as lo is part of bond bond0
> bond0: lo is up - this may be due to an out of date ifenslave
> IPVS: ftp: loaded support on port[0] = 21
> A link change request failed with some changes committed already. Interface
> lo may have been left with an inconsistent configuration, please check.
> IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
> IPVS: ftp: loaded support on port[0] = 21
> IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
> bond0: enslaved VLAN challenged slave lo. Adding VLANs will be blocked as
> long as lo is part of bond bond0
> bond0: lo is up - this may be due to an out of date ifenslave
> A link change request failed with some changes committed already. Interface
> lo may have been left with an inconsistent configuration, please check.
> IPVS: ftp: loaded support on port[0] = 21
> IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
> bond0: enslaved VLAN challenged slave lo. Adding VLANs will be blocked as
> long as lo is part of bond bond0
> bond0: lo is up - this may be due to an out of date ifenslave
> A link change request failed with some changes committed already. Interface
> lo may have been left with an inconsistent configuration, please check.
> IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
> IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
> bond0: enslaved VLAN challenged slave lo. Adding VLANs will be blocked as
> long as lo is part of bond bond0
> bond0: lo is up - this may be due to an out of date ifenslave
> A link change request failed with some changes committed already. Interface
> lo may have been left with an inconsistent configuration, please check.
> 
> 
> ---
> 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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> For more options, visit https://groups.google.com/d/optout.

#syz dup: BUG: please report to dccp@...r.kernel.org => prev = 0, last = 0 at net/dccp/ccids/lib/packet_history.c:LINE/tfrc_rx_hist_sample_rtt()

Still occurring, see existing thread with reproducer here:
https://groups.google.com/d/msg/syzkaller-bugs/u5nq3PdPkIc/M7tbibYVCQAJ

- Eric

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