[mod-security-users] Failed to write to DBM file

[Matthew R. <mat...@an...>]

ModSecurity: collection_store: Failed to write to DBM file
"/var/log/modsecurity
/SecDataDir/global": Invalid argument

I've got mod security installed (2.7.7) installed under Ubuntu 14.04 with
Apache 2.4.7

I have been getting the above error and seen it explained on the net as due
to a limitation in libapr.

0) Is this actually a problem? Or, is it something I ought to fix in apache
or my application?
1) Does anyone know if that is actually the problem?
2) Other than recompiling apache and libapr, is there a way resolve this
problem?
3) If I do need to recompile, can I get away with recompiling libapr and
replacing the existing one?

Thanks in advance!