Package: src:linux
Version: 4.16.16-2
Severity: important
Dear Maintainer,
This system hosts several KVM guests and a simh VAX, all of which connect to
the local network using bridge br0:
buzz:~# brctl show br0
bridge name bridge id STP enabled interfaces
br0 8000.aa0004000308 no eth1
tap0
vnet0
vnet1
vnet2
buzz:~#
Here, eth1 is the physical NIC, tap0 is owned by my simh VAX, and vnet# are
my KVM guests.
Following the upgrade to 4.16.0-2-amd64, none of these guests can
communicate
with anything except buzz (the host). Rebooting back to 4.16.0-1-amd64
restores
normal connectivity.
Studying the arp table on one of the guests suggests that arp resolution
succeeds (since the arp table contains valid MAC addresses vs ""
and the guest was restarted when buzz rebooted, so these can't be entries
from before the problem onset).
tcpdump on the guest while attempting to ping an external physical system on
the same network shows outgoing ICMP echo request packets, but no responses.
The same behavior is observed attempting to ping one of the other guests. I
also see unrelated other traffic (STP packets, ARP and DNS traffic from
other
systems on this subnet, etc.)
Thanks,
-Scott
-- Package-specific info:
** Version:
Linux version 4.16.0-2-amd64 (debian-kernel@lists.debian.org) (gcc version
7.3.0 (Debian 7.3.0-23)) #1 SMP Debian 4.16.16-2 (2018-06-22)
** Command line:
BOOT_IMAGE=/vmlinuz-4.16.0-2-amd64 root=/dev/mapper/vg00-root ro
elevator=deadline
** Not tainted
** Kernel log:
[ 184.547886] IPv6: ADDRCONF(NETDEV_CHANGE): docker0: link becomes ready
[ 184.551012] docker0: port 2(vethd1c9441) entered disabled state
[ 184.606709] docker0: port 3(vethc366df7) entered blocking state
[ 184.606712] docker0: port 3(vethc366df7) entered disabled state
[ 184.606749] device vethc366df7 entered promiscuous mode
[ 184.607004] IPv6: ADDRCONF(NETDEV_UP): vethc366df7: link is not ready
[ 184.607007] docker0: port 3(vethc366df7) entered blocking state
[ 184.607009] docker0: port 3(vethc366df7) entered forwarding state
[ 184.98] docker0: port 4(vethfea270f) entered blocking state
[ 184.666703] docker0: port 4(vethfea270f) entered disabled state
[ 184.666774] device vethfea270f entered promiscuous mode
[ 184.667422] IPv6: ADDRCONF(NETDEV_UP): vethfea270f: link is not ready
[ 184.667426] docker0: port 4(vethfea270f) entered blocking state
[ 184.667428] docker0: port 4(vethfea270f) entered forwarding state
[ 184.916492] eth0: renamed from veth11ac1d4
[ 184.961777] docker0: port 3(vethc366df7) entered disabled state
[ 184.961846] docker0: port 4(vethfea270f) entered disabled state
[ 184.961873] IPv6: ADDRCONF(NETDEV_CHANGE): vethfbc6cd1: link becomes
ready
[ 184.961912] docker0: port 1(vethfbc6cd1) entered blocking state
[ 184.961914] docker0: port 1(vethfbc6cd1) entered forwarding state
[ 185.008399] eth0: renamed from veth3b69021
[ 185.030837] IPv6: ADDRCONF(NETDEV_CHANGE): vethd1c9441: link becomes
ready
[ 185.030886] docker0: port 2(vethd1c9441) entered blocking state
[ 185.030889] docker0: port 2(vethd1c9441) entered forwarding state
[ 185.073249] eth0: renamed from veth0bc32af
[ 185.107428] IPv6: ADDRCONF(NETDEV_CHANGE): vethc366df7: link becomes
ready
[ 185.107481] docker0: port 3(vethc366df7) entered blocking state
[ 185.107484] docker0: port 3(vethc366df7) entered forwarding state
[ 185.138492] eth0: renamed from veth7410428
[ 185.165175] IPv6: ADDRCONF(NETDEV_CHANGE): vethfea270f: link becomes
ready
[ 185.165223] docker0: port 4(vethfea270f) entered blocking state
[ 185.165226] docker0: port 4(vethfea270f) entered forwarding state
[ 185.296071] virbr1: port 1(virbr1-nic) entered forwarding state
[ 185.296074] virbr1: topology change detected, propagating
[ 185.296127] IPv6: ADDRCONF(NETDEV_CHANGE): virbr1: link becomes ready
[ 186.082642] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 186.082646] Bluetooth: BNEP filters: protocol multicast
[ 186.082650] Bluetooth: BNEP socket layer initialized
[ 186.902286] virbr1: port 1(virbr1-nic) entered disabled state
[ 186.909553] virbr0: port 1(virbr0-nic) entered blocking state
[ 186.909557] virbr0: port 1(virbr0-nic) entered disabled state
[ 186.909613] device virbr0-nic entered promiscuous mode
[ 187.074362] virbr0: port 1(virbr0-nic) entered blocking state
[ 187.074366] virbr0: port 1(virbr0-nic) entered listening state
[ 187.123796] virbr0: port 1(virbr0-nic) entered disabled state
[ 187.129902] virbr2: port 1(virbr2-nic) entered blocking state
[ 187.129906] virbr2: port 1(virbr2-nic) entered disabled state
[ 187.135908] device virbr2-nic entered promiscuous mode
[ 187.240511] virbr2: port 1(virbr2-nic) entered blocking state
[ 187.240515] virbr2: