[Bug dynamic-link/21609] New: Incomplete workaround for GCC __tls_get_addr ABI issue on x86-64

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21609

            Bug ID: 21609
           Summary: Incomplete workaround for GCC __tls_get_addr ABI issue
                    on x86-64
           Product: glibc
           Version: 2.25
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
  Target Milestone: ---
            Target: x86-64

In bug 15128, glibc added some code to compensate for an invalid calling
sequence of the __tls_get_addr function generated by GCC for old binaries. 
However, this code only works around issues caused by the GCC ABI violation
within the dynamic linker.  It does not protect __tls_get_addr itself.  With
recent GCC enhancements, __tls_get_addr and the code it calls (notably malloc)
need stack realignment as well.

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