[Bug network/21668] New: resolv: res_init cross-thread broadcast introduces race conditions

["fweimer at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21668

            Bug ID: 21668
           Summary: resolv: res_init cross-thread broadcast introduces
                    race conditions
           Product: glibc
           Version: 2.26
            Status: NEW
          Severity: normal
          Priority: P2
         Component: network
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
  Target Milestone: ---
             Flags: security-

The __res_initstamp mechanism can trigger a resolv.conf reload through
__res_maybe_init after an application (or getaddrinfo) has changed
_res.options.  The reload will incorrect revert the change to _res.options.

I think the cross-thread broadcast is invalid and should go away in favor of
automated resolv.conf reloading (bug 984).

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