[Bug libc/2016] New: argp --help infloop, via ARGP_HELP_FMT envvar

["list+redhat-bugzilla at meyering dot net" <sourceware-bugzilla at sourceware dot org>]

You can make any argp-using program infloop simply by running it
with --help and with something like ARGP_HELP_FMT=rmargin=a in the
environment.  Or use a valid (but small) width: ARGP_HELP_FMT=rmargin=2

  $ time ARGP_HELP_FMT=rmargin=2 tar --help > /dev/null
  ARGP_HELP_FMT=rmargin=2 tar --help > /dev/null  35.49s user 0.17s system 97% cp
u 36.648 total
  [Exit 130 (INT)]

-- 
           Summary: argp --help infloop, via ARGP_HELP_FMT envvar
           Product: glibc
           Version: 2.3.6
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: list+redhat-bugzilla at meyering dot net
                CC: glibc-bugs at sources dot redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=2016

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