On Fri, Feb 09, 2018 at 12:04:11PM -0600, Bruce Dubbs wrote:
> Ken Moffat wrote:
> > UNSUPPORTED: misc/tst-ttyname
> This is what I got on my system (i7-5820K, Haswell E):
> FAIL: misc/tst-ttyname
> Summary of test results:
>       1 FAIL
> I do not know why misc/tst-ttyname fails on my system and is unsupported on
> yours.  I am doing a jhalfs build.
I've now rerun this on the host system (LFS as at 20171231).
This is as my normal user.

Looking at scripts/evaluate-test.sh reports unsupported if the test
returns 77, pass for 0, fail for any other value.

misc/tst-ttyname.out says -

warning: could not become root outside namespace (Operation not permitted)
info:  entering chroot 1
info:    testcase: basic smoketest
info:      ttyname: PASS {name="/dev/pts/5", errno=0}
info:      ttyname_r: PASS {name="/dev/pts/5", ret=0, errno=0}
warning: unshare (CLONE_NEWNS) failed: Operation not permitted
error: ../sysdeps/unix/sysv/linux/tst-ttyname.c:280: could not enter new mount 

and therefore misc/tst-ttyname.test-result says -

UNSUPPORTED: misc/tst-ttyname
original exit status 77

Google has various links for the unshare failing, most of which seem
to be talking about problems with containers.  But
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=808915i#10 gave a

"It turns out that the Debian kernel is set up to disable
unprivileged users from unsharing the user namespace by default."

That was done by a patch, a sysctl to allow it perhaps went
upstream later, not sure.  (I found that out from
https://lwn.net/Articles/673597/ ).  Anyway, in _my_ config I avoid
extra namespaces like the plague ;-)

# CONFIG_CGROUPS is not set
# CONFIG_UTS_NS is not set
# CONFIG_IPC_NS is not set
# CONFIG_USER_NS is not set
# CONFIG_PID_NS is not set
# CONFIG_NET_NS is not set

I think that CONFIG_NAMESPACES is turned on by MULTIUSER, but all
the other namespaces are optional.

In particular, CONFIG_USER_NS is for containers.

Since you usually start from defconfig, I guess most of these are
turned on in your config.  If that is the case, I think you will
have to take time out to build and test glibc in a completed system
to see why it fails :-(

Truth, in front of her huge walk-in wardrobe, selected black leather
boots with stiletto heels for such a barefaced truth.
                                     - Unseen Academicals
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