[systemd-devel] failed assertion in systemd-networkd

Tom Gundersen teg at jklm.no
Sun Dec 7 04:05:03 PST 2014

On Sat, Dec 6, 2014 at 8:10 PM, Dave Reisner <d at falconindy.com> wrote:
> On Sat, Dec 06, 2014 at 01:46:23PM -0500, Dave Reisner wrote:
>> Hi,
>> With the latest pull from git, I'm seeing a failed assertion in
>> systemd-networkd:
>> Assertion 's' failed at src/shared/util.c:413, function safe_atou8().  Aborting.
>> The problematic .network file is simply:
>>   [Match]
>>   Name=eth0
>>   [Network]
>>   DHCP=v4
>> The backtrace points here:
>> http://cgit.freedesktop.org/systemd/systemd/tree/src/network/networkd-network.c#n233
>> Where I suppose that:
>>   udev_device_get_sysattr_value(device, "name_assign_type");
>> is returning NULL. The file exists, but any attempts to read it results
>> in a 0 byte read and an EINVAL errno. Removing the [Match] section from
>> the .network file avoids the failed assertion.
>> Is this a kernel bug? Shouldn't this file be returning one of the enums
>> values like NET_NAME_PREDICTABLE or NET_NAME_USER? This holds true on
>> both a VM (using the virtio-net module), and also on my desktop (using
>> the sky2 module).
> Ah, I see:
> https://github.com/torvalds/linux/blob/master/net/core/net-sysfs.c#L120
> If dev->name_assign_type == NET_NAME_UNKNOWN, reading name_assign_type
> errors with -EINVAL. Tom, why is this intentionally hidden from
> userspace?
> https://github.com/torvalds/linux/blob/master/include/uapi/linux/netdevice.h#L41

So that we can change it into some other NET_NAME_* value in the
future without "breaking userspace". It is (apparently) ok to change
from returning an error into returning some value, but not ok to
change the value you return.



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