[Bug 1925216] Re: confusing but harmless warning messages printed about syscalls

[Dan Streetman]

** Changed in: systemd (Ubuntu Bionic)
       Status: New => In Progress

** Changed in: systemd (Ubuntu Bionic)
     Assignee: (unassigned) => Dan Streetman (ddstreet)

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https://bugs.launchpad.net/bugs/1925216

Title:
  confusing but harmless warning messages printed about syscalls

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Bionic:
  In Progress

Bug description:
  [impact]

  systemd prints messages that complain about system calls such as:

  /lib/systemd/system/systemd-journald.service:33: Failed to parse
  system call, ignoring: pidfd_getfd

  [test case]

  boot bionic system with 4.15 kernel that does not support pidfd_getfd
  syscall

  [regression potential]

  any regression would prevent correct configuration of seccomp syscall
  filters, and/or failure to load/parse unit files that contain
  SystemCallFilter= directives

  [scope]

  this is needed only for b

  this is fixed upstream by commit
  13d92c6300edbb1369f97c2e1bef4c4096de8ddb which was included in v238,
  so this is fixed in focal and later

  this is not needed for x as seccomp handling is completely different
  in that older release

  [other info]

  as the warning states, the invalid system call is ignored, which is
  the correct action, and the patch to fix this just changes the log to
  debug instead of warning (along with consolidation of several flag
  params into a single flag enum). Thus, no actual change in behavior
  should occur (other than logging the messages as debug instead of
  warning).

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