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
namespace
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
clue:
"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_NAMESPACES=y
# 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
# CONFIG_SCHED_AUTOGROUP is not set
# CONFIG_SYSFS_DEPRECATED 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 :-(
ĸen
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