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SubjectBUG: please report to => prev = 10, last = 10 at net/dccp/ccids/lib/packet_history.c:LINE/tfrc_rx_h
From
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bond0: lo is up - this may be due to an out of date ifenslave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.
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:
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syzbot.

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