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- Newsgroups: gnu.gdb.bug
- Path: sparky!uunet!usc!zaphod.mps.ohio-state.edu!cis.ohio-state.edu!mtgzy.UUCP!dwex
- From: dwex@mtgzy.UUCP
- Subject: GDB 4.6 core dump reading dynamically-loaded object symtab
- Message-ID: <9208172029.AA26872@mtgzfs3.att.com>
- Sender: gnulists@ai.mit.edu
- Organization: GNUs Not Usenet
- Distribution: gnu
- Date: Mon, 17 Aug 1992 20:29:10 GMT
- Approved: bug-gdb@prep.ai.mit.edu
- Lines: 86
-
- GDB version: 4.6
- Architecture/OS: Sun SparcStation ELC/SunOS 4.1.1
- GDB Compiled With: GCC 2.2.2 (with demangling patch applied)
- Application Compiled With: Unknown (probably stock Sun cc)
-
- Description:
- Used the 'sharedlibrary' command to force loading of dynamically
- loaded object libraries in an Andrew application, after the
- application died with a SIGSEGV. GDB dropped core with
- SIGSEGV, dereferencing through a null pointer. Here's
- the stack backtrace:
-
- -----------------------------------------------------------------------------
- #0 0x776e4 in read_dbx_symtab (section_offsets=0x42d0f0, objfile=0x41b308,
- text_addr=0, text_size=8192) at ../../gdb-4.6/gdb/partial-stab.h:518
- #1 0x7412c in dbx_symfile_read (objfile=0x41b308, section_offsets=0x42d0f0,
- mainline=0) at ../../gdb-4.6/gdb/dbxread.c:482
- #2 0x36960 in syms_from_objfile (objfile=0x41b308, addr=4149805056,
- mainline=0, verbo=0) at ../../gdb-4.6/gdb/symfile.c:450
- #3 0x36cd0 in symbol_file_add (
- name=0x35f434 "/usr/add-on/andrew/dlib/atk/glist.do", from_tty=0,
- addr=4149805056, mainline=0, mapped=0, readnow=0)
- at ../../gdb-4.6/gdb/symfile.c:581
- #4 0x56748 in symbol_add_stub (arg=0x35f408 "")
- at ../../gdb-4.6/gdb/solib.c:674
- #5 0x2478 in catch_errors (func=0x56710 <print_insn+5536>, args=0x35f408 "",
- errstring=0x567a0 "Error while reading shared library symbols:\n")
- at ../../gdb-4.6/gdb/main.c:367
- #6 0x568dc in solib_add (arg_string=0x0, from_tty=1, target=0x0)
- at ../../gdb-4.6/gdb/solib.c:728
- #7 0x57208 in sharedlibrary_command (args=0x0, from_tty=1)
- at ../../gdb-4.6/gdb/solib.c:1267
- #8 0x3d90 in execute_command (p=0x14000d "", from_tty=1)
- at ../../gdb-4.6/gdb/main.c:915
- #9 0x4014 in command_loop () at ../../gdb-4.6/gdb/main.c:976
- #10 0x3af4 in main (argc=2, argv=0xf7ffe70c) at ../../gdb-4.6/gdb/main.c:853
- -------------------------------------------------------------------------------
-
- Here's a patch that appears (at first glance) to solve the problem, or at
- least work around it:
-
- -------------------------------------------------------------------------------
- *** ORIG/partial-stab.h Mon Aug 17 13:18:04 1992
- --- partial-stab.h Mon Aug 17 13:20:00 1992
- ***************
- *** 493,499 ****
- #ifdef DBXREAD_ONLY
- /* Kludges for ELF/STABS with Sun ACC */
- last_function_name = namestring;
- ! if (pst->textlow == 0)
- pst->textlow = CUR_SYMBOL_VALUE;
- #if 0
- if (startup_file_end == 0)
- --- 493,499 ----
- #ifdef DBXREAD_ONLY
- /* Kludges for ELF/STABS with Sun ACC */
- last_function_name = namestring;
- ! if (pst && pst->textlow == 0)
- pst->textlow = CUR_SYMBOL_VALUE;
- #if 0
- if (startup_file_end == 0)
- ***************
- *** 515,521 ****
- #ifdef DBXREAD_ONLY
- /* Kludges for ELF/STABS with Sun ACC */
- last_function_name = namestring;
- ! if (pst->textlow == 0)
- pst->textlow = CUR_SYMBOL_VALUE;
- #if 0
- if (startup_file_end == 0)
- --- 515,521 ----
- #ifdef DBXREAD_ONLY
- /* Kludges for ELF/STABS with Sun ACC */
- last_function_name = namestring;
- ! if (pst && pst->textlow == 0)
- pst->textlow = CUR_SYMBOL_VALUE;
- #if 0
- if (startup_file_end == 0)
- ------------------------------------------------------------------------------
-
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