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[patch] Fix gdb crash on some missing ELF debug info
- From: Jan Kratochvil <lace at jankratochvil dot net>
- To: gdb-patches at sources dot redhat dot com
- Date: Fri, 23 Jun 2006 12:37:35 +0200
- Subject: [patch] Fix gdb crash on some missing ELF debug info
Hi,
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=196439
On Fedora Core 5:
gdb /usr/lib/valgrind/x86-linux/memcheck
break _start_in_C
run
segfaults as the file's debug info references location list while no
".debug_loc" section exists there.
eu-readelf -w /usr/lib/valgrind/x86-linux/memcheck
DWARF section '.debug_info' at offset 0x14759c:
...
[ 176d4] subprogram
...
name "_start_in_C"
...
frame_base location list [ 116d7]
Trivia complaint on the file coherency, no frame_info debugging available for
such functions.
Regards,
Jan Kratochvil
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=196439
Fedora Core 5:
gdb /usr/lib/valgrind/x86-linux/memcheck
break _start_in_C
run
segfault
eu-readelf -w /usr/lib/valgrind/x86-linux/memcheck
DWARF section '.debug_info' at offset 0x14759c:
...
[ 176d4] subprogram
...
name "_start_in_C"
...
frame_base location list [ 116d7]
corrupted as no location lists (.debug_loc) exist there at all.
Index: dwarf2read.c
===================================================================
RCS file: /cvs/src/src/gdb/dwarf2read.c,v
retrieving revision 1.199
diff -u -p -r1.199 dwarf2read.c
--- dwarf2read.c 14 Jun 2006 15:06:35 -0000 1.199
+++ dwarf2read.c 23 Jun 2006 10:28:44 -0000
@@ -9324,7 +9324,9 @@ static void
dwarf2_symbol_mark_computed (struct attribute *attr, struct symbol *sym,
struct dwarf2_cu *cu)
{
- if (attr->form == DW_FORM_data4 || attr->form == DW_FORM_data8)
+ if ((attr->form == DW_FORM_data4 || attr->form == DW_FORM_data8)
+ /* DW_UNSND (attr) != 0 would produce non-zero bogus ->size & ->data */
+ && dwarf2_per_objfile->loc_size)
{
struct dwarf2_loclist_baton *baton;