GNU bug report logs - #23582
'call-with-container' fails to mount /dev/mqueue with EBUSY (on Ubuntu)

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Message #23 received at 23582 <at> debbugs.gnu.org (full text, mbox):

From: Leo Famulari <leo <at> famulari.name>
To: Ben Woodcroft <b.woodcroft <at> uq.edu.au>
Cc: Konrad Hinsen <konrad.hinsen <at> fastmail.net>, davet <at> gnu.org,
 23582 <at> debbugs.gnu.org
Subject: Re: bug#23582: Test failure on "make check" from a fresh git
 checkout (commit 9684e30b9b597b93ae9c797ba8f3b40eff893ebe)
Date: Sat, 21 May 2016 11:19:10 -0400

On Sat, May 21, 2016 at 08:37:49PM +1000, Ben Woodcroft wrote:
> On 21/05/16 17:21, Konrad Hinsen wrote:
> > No error message this time. The log is attached.
> 
> From teh log:
> > 10526 mkdir("/tmp/guix-directory.2EiFxS/dev/mqueue", 0775) = 0
> > 10526 mount("mqueue", "/tmp/guix-directory.2EiFxS//dev/mqueue", "mqueue",
> MS_NOSUID|MS_NODEV|MS_NOEXEC, NULL) = -1 EBUSY (Device or resource busy)
> 
> This then might be the same issue as discussed previously
> http://lists.gnu.org/archive/html/help-guix/2016-05/msg00006.html

A quick scan through the mqueue man pages suggests mq_notify(3):

"mq_notify - register for notification when a message is available

[...]

EBUSY  Another process has already registered to receive
notification for this message queue."

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