[Bug libc/20435] New: Missing unwind info in setcontext causes infinite loop in _Unwind_Backtrace

["schwab at linux-m68k dot org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20435

            Bug ID: 20435
           Summary: Missing unwind info in setcontext causes infinite loop
                    in _Unwind_Backtrace
           Product: glibc
           Version: 2.22
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: schwab@linux-m68k.org
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---
              Host: arm*-*-*

Since setcontext transfers to a different stack it should be marked
.cantunwind, so that the EABI unwinder does not try to unwind past it.  This
can cause _Unwind_Backtrace (used by backtrace_full in libbacktrace) to
infloop.

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