[Bug nptl/19430] New: __reclaim_stacks is bogus

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

https://sourceware.org/bugzilla/show_bug.cgi?id=19430

            Bug ID: 19430
           Summary: __reclaim_stacks is bogus
           Product: glibc
           Version: 2.23
            Status: NEW
          Severity: normal
          Priority: P2
         Component: nptl
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

If I read the __reclaim_stacks code correctly, it frees the stack of all other
threads after a fork.  This is not a safe thing to do because pointers to
on-stack data may have been written to global variables or shared with the
current thread by other means, and those objects have to be remain valid after
fork.

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