[Bug nptl/27895] New: timer_create does not propagate all thread attributes to the new thread

[Bug nptl/27895] New: timer_create does not propagate all thread attributes to the new thread

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27895

            Bug ID: 27895
           Summary: timer_create does not propagate all thread attributes
                    to the new thread
           Product: glibc
           Version: 2.34
            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: ---

timer_create has a custom, incomplete version of __pthread_attr_copy following
this comment:

        /* We cannot simply copy the thread attributes since the
           implementation might keep internal information for
           each instance.  */

As a result, some thread attributes (those reached through the extension
mechanism) are lost.

This bug was found through code inspection.  To application impact is known. 
It was introduced by:

commit 7538d461134bf306e31b40e4032f0c225bb40d51
Author: Florian Weimer <fweimer@redhat.com>
Date:   Tue Jun 2 10:33:30 2020 +0200

    nptl: Make pthread_attr_t dynamically extensible

    This introduces the function __pthread_attr_extension to allocate the
    extension space, which is freed by pthread_attr_destroy.

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