Debugging with Xcode 2.3 crashes gdb.

• Subject: Debugging with Xcode 2.3 crashes gdb.
• From: "Arne Scheffler" <email@hidden>
• Date: Thu, 25 May 2006 20:03:32 +0200
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Hi,
I'm just searching for others having the same crashes as I am. While
stepping through our code, Xcode seems to send bogus stuff to gdb,
where gdb just crashes. Half of the time I'm trying to debug
something, it crashes. Then I need to use printf to track bugs down.

Bug ID : 4504668

Here are the first few lines of the crashlog :

Thread 0 Crashed:
0   libSystem.B.dylib        	0x900101d4 __sfvwrite + 20
1   libSystem.B.dylib        	0x9000fe88 __vfprintf$LDBL128 + 15824
2   libSystem.B.dylib        	0x900ee820 vasprintf$LDBL128 + 244
3   gdb-powerpc-apple-darwin 	0x0001ddc4 xstrvprintf + 48
4   gdb-powerpc-apple-darwin 	0x0001f094 vfprintf_maybe_filtered + 52
5   gdb-powerpc-apple-darwin 	0x0001f148 fprintf_filtered + 56
6   gdb-powerpc-apple-darwin 	0x00110f88 cp_print_value_fields + 116
7   gdb-powerpc-apple-darwin 	0x00111674 cp_print_value_fields + 1888
8   gdb-powerpc-apple-darwin 	0x00111da8 cp_print_value + 1204
9   gdb-powerpc-apple-darwin 	0x00110fe4 cp_print_value_fields + 208
10  gdb-powerpc-apple-darwin 	0x00111da8 cp_print_value + 1204
11  gdb-powerpc-apple-darwin 	0x00110fe4 cp_print_value_fields + 208
12  gdb-powerpc-apple-darwin 	0x00111674 cp_print_value_fields + 1888
13  gdb-powerpc-apple-darwin 	0x00111da8 cp_print_value + 1204
14  gdb-powerpc-apple-darwin 	0x00110fe4 cp_print_value_fields + 208

it goes on until line 508. I investigated further, attached a gdb to
gdb to see what the start of this crash looks like, and gdb shows me
this stack trace :

#30118 0x000d1070 in cp_print_value_fields ()
#30119 0x000d1920 in cp_print_value ()
#30120 0x000d08b4 in cp_print_value_fields ()
#30121 0x000d1070 in cp_print_value_fields ()
#30122 0x000d1920 in cp_print_value ()
#30123 0x000d08b4 in cp_print_value_fields ()
#30124 0x000d1070 in cp_print_value_fields ()
#30125 0x000d1920 in cp_print_value ()
#30126 0x000d08b4 in cp_print_value_fields ()
#30127 0x000d1920 in cp_print_value ()
#30128 0x000d08b4 in cp_print_value_fields ()
#30129 0x000cfa3b in c_val_print ()
#30130 0x00047f46 in common_val_print ()
#30131 0x000cf95a in c_val_print ()
#30132 0x00047f46 in common_val_print ()
#30133 0x000c58ab in c_value_of_variable ()
#30134 0x000c72d6 in gdb_varobj_get_value ()
#30135 0x0001152f in print_syms_for_block ()
#30136 0x00011f1f in list_args_or_locals ()
#30137 0x00012097 in mi_cmd_stack_list_args ()
#30138 0x0001715c in captured_mi_execute_command ()
#30139 0x00074239 in catch_exception ()
#30140 0x00016548 in mi_execute_command ()
#30141 0x000166ef in mi_execute_command_wrapper ()
#30142 0x00076c03 in handle_file_event ()
#30143 0x00076603 in process_event ()
#30144 0x000774df in gdb_do_one_event ()
#30145 0x00074457 in catch_errors ()
#30146 0x00076661 in start_event_loop ()
#30147 0x00075189 in captured_command_loop ()
#30148 0x00074457 in catch_errors ()
#30149 0x000764d1 in captured_main ()
#30150 0x00074457 in catch_errors ()
#30151 0x00076511 in gdb_main ()
#30152 0x00002639 in main ()

I'm out of any ideas how to help apple to fix this, as I can not break
this bug down to a reproducible sample and I can't give them the code.

thanks
arne
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