https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89946

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-on-invalid-code
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2019-04-03
                 CC|                            |msebor at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed.  The ICE first appeared in r250521 when the attribute was added. 
The handler for the attributes does no validation:

  static tree
  handle_patchable_function_entry_attribute (tree *, tree, tree, int, bool *)
  {
    /* Nothing to be done here.  */
    return NULL_TREE;
  }

With struct attribute_spec extended to describe basic properties of attribute
arguments besides just their number, basic attribute argument validation could
be done in decl_attributes, similarly to how mutually exclusive attributes are
handled.

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