[Bug 1883447] Re: nspawn blocks _time64 syscalls, breaks upgrade to focal in containers

[Balint Harmath]

Nice write down of the problem. Also provided solution. Here it goes
onto the next state.

** Changed in: systemd (Ubuntu)
       Status: New => Confirmed

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Title:
  nspawn on arm blocks _time64 syscalls, breaks upgrade to focal in
  containers

Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  This may only affect armhf, but I can't see why it should.

  Recent Linux kernels introduced a number of new syscalls ending in
  _time64 to fix Y2038 problem; it appears recent glibc, including the
  version in focal, test for the existence of these. systemd-nspawn in
  bionic (237-3ubuntu10.38) doesn't know about these so blocks them by
  default. It seems however glibc isn't expecting an EPERM, causing
  numerous programs to fail.

  In particular, running do-release-upgrade to focal in an nspawn
  container hosted on bionic will break as soon as the new libc has been
  unpacked.

  Solution (tested here) is to cherrypick upstream commit
  https://github.com/systemd/systemd/commit/6ca677106992321326427c89a40e1c9673a499b2

  A newer libseccomp is also needed but this is already being worked on,
  see bug #1876055.

  It's a pretty trivial fix one the new libseccomp lands, and there is
  precedent for SRU-ing for a similar issue in bug #1840640.

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