[systemd-bugs] [Bug 80556] New: networkd fails assertion on tap device going away

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80556

          Priority: medium
            Bug ID: 80556
          Assignee: systemd-bugs at lists.freedesktop.org
           Summary: networkd fails assertion on tap device going away
        QA Contact: systemd-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: d at falconindy.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: general
           Product: systemd

Created attachment 101800
  --> https://bugs.freedesktop.org/attachment.cgi?id=101800&action=edit
bt full

I can semi-reliably hit a failed assertion when shutting down a VM:

tap0            : link 41 added
tap0            : udev initializing link...
tap0            : flags change: +MULTICAST +BROADCAST
tap0            : MAC address: fe:8d:25:75:f8:a1
br-qemu         : MAC address: fe:8d:25:75:f8:a1
tap0            : flags change: +UP +LOWER_UP +RUNNING
tap0            : gained carrier
br-qemu         : flags change: +LOWER_UP +RUNNING
br-qemu         : gained carrier
sd-rtnl: discarding 20 bytes of incoming message
tap0            : added address: fe80::fc8d:25ff:fe75:f8a1/64
tap0            : udev initialized link
tap0            : link state is up-to-date
tap0            : unmanaged
tap0            : flags change: -UP -LOWER_UP -RUNNING
tap0            : removed address: fe80::fc8d:25ff:fe75:f8a1/64
tap0            : link removed
tap0            : link 41 added
tap0            : could not find udev device
could not add new link
br-qemu         : MAC address: 00:00:00:00:00:00
br-qemu         : flags change: -LOWER_UP
tap0            : link removed
br-qemu         : flags change: -RUNNING
br-qemu         : lost carrier
sd-rtnl: discarding 20 bytes of incoming message
Assertion 'm' failed at src/network/networkd-link.c:2029, function
link_rtnl_process_address(). Aborting.

The KVM is given a bridge device:

# /etc/systemd/network/br-qemu.netdev
[NetDev]
Name=br-qemu
Kind=bridge

# /etc/systemd/network/br-qemu.network
[Match]
Name=br-qemu

[Network]
Description=Qemu vlan
Address=10.0.2.1/24
Address=2001:470:736c:107::1/64


And is started with args: -netdev bridge,br=br-qemu,id=mynet0 -device
virtio-net,netdev=mynet0,mac=de:ad:be:ef:00:07

I've bisected this breakage to fbbeb65a93e2f90f6576001b. Backtrace attached.
It's likely a race condition somewhere -- the SIGABRT sometimes turns into a
SIGSEGV when I set SYSTEMD_LOG_LEVEL=debug.

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/systemd-bugs/attachments/20140626/9f51b474/attachment.html>