[Bug symtab/14601] New: segv when reading DW_TAG_imported_declaration,module

["dje at google dot com" <sourceware-bugzilla@sourceware.org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=14601

             Bug #: 14601
           Summary: segv when reading DW_TAG_imported_declaration,module
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: symtab
        AssignedTo: unassigned@sourceware.org
        ReportedBy: dje@google.com
    Classification: Unclassified


buildsym.c:using_directive is assumed to be NULL at the start of symbol
processing.  Not all code paths ensure this.  If a
DW_TAG_imported_declaration,module happens outside of finish_block_internal or
push_context, it won't get reset back to NULL, leaving a potentially dangling
value.

To see the crash you need to compile the testcase with -fdebug-types-section,
but there's nothing inherently dwarf4 or even dwarf-specific here.

bash$ gdb -nx testsuite/gdb.cp/using-crash
(gdb) b foo
(gdb) run
(gdb) kill
(gdb) file testsuite/gdb.cp/using-crash
Load new symbol table from "/foo/testsuite/gdb.cp/using-crash"? (y or n) y
Reading symbols from /foo/testsuite/gdb.cp/using-crash...done.
Segmentation fault

Patch to follow.

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