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e10mr21378501otq.19.1545303303281; Thu, 20 Dec 2018 02:55:03 -0800 (PST) Date: Thu, 20 Dec 2018 02:55:03 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000007664bf057d71f6d7@google.com> Subject: BUG: please report to dccp@vger.kernel.org => prev = 10, last = 10 at net/dccp/ccids/lib/packet_history.c:LINE/tfrc_rx_h From: syzbot To: davem@davemloft.net, dccp@vger.kernel.org, gerrit@erg.abdn.ac.uk, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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@syzkaller.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 Adding VLANs will be blocked as long as lo is part of bond bond0 bond0: lo is up - this may be due to an out of date ifenslave A link change request failed with some changes committed already.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@vger.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. 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