Arto, it's the simple fix, but before I push it further, does the
attached patch fix your problem?

At this point (ii.e., since LInux 3.8), I suspect that the limit that
the kernel code  currently tries to enforce on queues_max is anyway
meaningless. Unprivileged users can nowadays use
clone(CLONE_NEWUSER|CLONE_NEWIPC) to create an arbitrary number of new
IPC namespaces, each of which can be populated with queues_max MQs. So
the hard limit check doesn't really limit users at all (though, as
you've discovered, it does inconvenience them).

** Patch added: "mqueue_limit.patch"
   
https://bugs.launchpad.net/ubuntu/+source/manpages/+bug/1155695/+attachment/3581440/+files/mqueue_limit.patch

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https://bugs.launchpad.net/bugs/1155695

Title:
  mq_overview(7) contains outdated, inaccurate fs.mqueue.queues_max
  limit description

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