glibc in master is incompatible with systemd-nspawn

[Florian Weimer]

* Dmitry V. Levin:

> On Fri, Nov 08, 2019 at 12:08:29PM +0100, Florian Weimer wrote:
>> systemd-nspawn (at least the Fedora version) applies a system call
>> filter which causes system calls to fail with EPERM instead of ENOSYS.
>> This breaks our fallback handling.  This problem has existed for a long
>> time, but it has become more prevalent with the recent time64 changes.
>
> Yes, this has been a long time issue for strace test suite, too.

And based on the systemd-nspawn manual page, there is no way to turn
this off:

“
Note that systemd-nspawn always implements a system call whitelist (as
opposed to a blacklist), and this command line option hence adds or
removes entries from the default whitelist, depending on the "~"
prefix.
”

Strange.

Thanks,
Florian