[Bug lto/69650] [6 Regression] ICE in linemap_line_start, at libcpp/line-map.c:803

[dmalcolm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69650

David Malcolm <dmalcolm at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dmalcolm at gcc dot gnu.org

--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
It's failing this assertion:
803       linemap_assert (SOURCE_LINE (map, r) == to_line);

here:

(gdb) bt
#2  0x0000000001257bba in linemap_line_start (set=0x7ffff7ffb000,
to_line=to_line@entry=1048577, max_column_hint=128)
    at ../../src/libcpp/line-map.c:803
#3  0x000000000092e0da in lto_location_cache::apply_location_cache
(this=this@entry=0x1dc6e08)
    at ../../src/gcc/lto-streamer-in.c:193

with a bogus-looking line number:
  (gdb) p to_line
  $1 = 1048577

The bogus line number is in the LTO data itself.