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Re: Crash in gdb

From: Dmitry Smirnov <divis1969 at mail dot ru>
To: gdb at sourceware dot org
Date: Wed, 10 Jun 2009 20:31:32 +0400
Subject: Re: Crash in gdb
Reply-to: Dmitry Smirnov <divis1969 at mail dot ru>
I had compiled GDB with -O0 and found the following:

While reading some function info (read_func_scope), GDB tries to inherit some abstract dies (inherit_abstract_dies)
When handling children of this die (function), it follows to another compilation unit.
The first child is a "void" with DW_TAG_base_type.
process_die() attempts to create a new symbol using that "another compilation unit".
This process crashes, since compilation unit does not have cu->list_in_scope (it is NULL). 

What could be wrong with that compilation unit? When list_in_scope is initialized with non-NULL?

Perhaps toolchain (ADS 1.2) does not follow some DWARF specs, but maybe I could just find some fix for it...

Here is the stack (it is more informative, since I was turned -O0

GDB Cygwin GCC (1) [C/C++ Application]	
	Cygwin gdb Debugger (09.06.09 19:24) (Suspended)	
		Thread [1] (Suspended: Breakpoint hit.)	
			57 add_symbol_to_list() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\buildsym.c:132 0x0054ade4	
			56 new_symbol() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\dwarf2read.c:7888 0x0050b078	
			55 process_die() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\dwarf2read.c:2867 0x005019b5	
			54 inherit_abstract_dies() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\dwarf2read.c:3181 
0x005023b3	
			53 read_func_scope() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\dwarf2read.c:3247 0x005025ee	
			52 process_die() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\dwarf2read.c:2828 0x00501941	
			51 read_file_scope() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\dwarf2read.c:3051 0x00501f45	
			50 process_die() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\dwarf2read.c:2825 0x0050192a	
			49 process_full_comp_unit() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\dwarf2read.c:2792 
0x00501834	
			48 process_queue() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\dwarf2read.c:2591 0x005012da	
			47 psymtab_to_symtab_1() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\dwarf2read.c:2671 0x005014ce	
			46 dwarf2_psymtab_to_symtab() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\dwarf2read.c:2544 
0x005011f2	
			45 psymtab_to_symtab() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\symfile.c:290 0x0040463e	
			44 lookup_symbol_aux_psymtabs() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\symtab.c:1540 
0x0046d6b4	
			43 lookup_symbol_global() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\symtab.c:1660 0x0046d93b	
			42 basic_lookup_symbol_nonlocal() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\symtab.c:1617 
0x0046d83c	
			41 lookup_symbol_aux() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\symtab.c:1345 0x0046d223	
			40 lookup_symbol_in_language() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\symtab.c:1254 
0x0046d03c	
			39 lookup_symbol() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\symtab.c:1268 0x0046d081	
			38 find_imps() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\objc-lang.c:1319 0x004d9402	
			37 decode_objc() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\linespec.c:1129 0x004ab945	
			36 decode_line_1() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\linespec.c:746 0x004ab185	
			35 parse_breakpoint_sals() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\breakpoint.c:5556 
0x0044c6b2	
			34 do_captured_parse_breakpoint() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\breakpoint.c:5592 
0x0044c7c2	
			33 catch_exception() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\exceptions.c:462 0x004142a8	
			32 break_command_really() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\breakpoint.c:5709 
0x0044cac3	
			31 set_breakpoint() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\breakpoint.c:5887 0x0044cfeb	
			30 mi_cmd_break_insert() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\mi\mi-cmd-break.c:156 
0x0054abbb	
			29 mi_cmd_execute() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\mi\mi-main.c:1369 0x00547626	
			28 captured_mi_execute_command() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\mi\mi-main.c:1176 
0x00546fb6	
			27 catch_exception() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\exceptions.c:462 0x004142a8	
			26 mi_execute_command() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\mi\mi-main.c:1270 0x00547227	
			25 mi_execute_command_wrapper() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\mi\mi-interp.c:251 
0x004b65d1	
			24 mi_interpreter_exec() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\mi\mi-interp.c:164 
0x004b6439	
			23 interp_exec() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\interps.c:326 0x0041ef52	
			22 interpreter_exec_cmd() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\interps.c:403 0x0041f17f	
			21 do_cfunc() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\cli\cli-decode.c:67 0x0043285b	
			20 cmd_func() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\cli\cli-decode.c:1734 0x00434f12	
			19 execute_command() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\top.c:442 0x00402767	
			18 command_handler() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\event-top.c:511 0x0042787d	
			17 command_line_handler() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\event-top.c:735 0x00427e96	
			16 rl_callback_read_char() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\readline\callback.c:205 
0x005c25b3	
			15 rl_callback_read_char_wrapper() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\event-top.c:178 
0x00426fcb	
			14 stdin_event_handler() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\event-top.c:433 0x00427747	
			13 handle_file_event() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\event-loop.c:812 0x00443ed7	
			12 process_event() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\event-loop.c:394 0x004436bd	
			11 gdb_do_one_event() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\event-loop.c:459 0x00443799	
			10 catch_errors() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\exceptions.c:510 0x004144c7	
			9 start_event_loop() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\event-loop.c:483 0x004437dc	
			8 cli_command_loop() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\event-top.c:211 0x004270f4	
			7 current_interp_command_loop() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\interps.c:293 
0x0041eec3	
			6 captured_command_loop() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\main.c:226 0x004012e9	
			5 catch_errors() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\exceptions.c:510 0x004144c7	
			4 captured_main() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\main.c:902 0x0040223f	
			3 catch_errors() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\exceptions.c:510 0x004144c7	
			2 gdb_main() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\main.c:911 0x00402275	
			1 main() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\gdb.c:33 0x004010ba	
		Thread [2] (Suspended)	
	gdb (09.06.09 19:24)	
	D:\Install\GDB\gdb-6.8.50.20090603\gdb\gdb.exe (09.06.09 19:24)	



-----Original Message-----
From: Dmitry Smirnov <divis1969@mail.ru>
To: Richard Earnshaw <member@buzzard.freeserve.co.uk>
Date: Mon, 08 Jun 2009 20:18:54 +0400
Subject: Re[2]: Crash in gdb

> yes it is true, but should it just crash in this case?
> 
> In fact, previous gdb vesrions are handling this elf very good despite the fact that version is not supported (I'm using 
ADS 
> 1.2 toolchain)
> 
> Below is the stack I've got while debugging in Eclipse CDT.
> It crashes at buildsym.c:132 
>   if (*listhead == NULL || (*listhead)->nsyms == PENDINGSIZE) 
> 
> In my case listhead is NULL. 
> Whethere NULL is invalid value and problem is somewhere before or this line need additional check, that is the question for 
> the moment... Any help is appreciated.
> 
> Thread [1] (Suspended: Signal 'SIGSEGV' received. Description: Segmentation fault.)	
> 	43 add_symbol_to_list() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\buildsym.c:132 0x0051ca1d	
> 	42 new_symbol() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\dwarf2read.c:7913 0x004e8c9c	
> 	41 process_die() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\dwarf2read.c:2893 0x004ea2e3	
> 	40 process_die() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\dwarf2read.c:3181 0x004eb449	
> 	39 process_die() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\dwarf2read.c:3051 0x004ead00	
> 	38 psymtab_to_symtab_1() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\dwarf2read.c:2792 0x004ebbc2	
> 	37 dwarf2_psymtab_to_symtab() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\dwarf2read.c:2544 0x004ebdad	
> 	36 psymtab_to_symtab() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\symfile.c:290 0x00404296	
> 	35 lookup_symbol_aux_psymtabs() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\symtab.c:1540 0x00464f68	
> 	34 lookup_symbol_in_language() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\symtab.c:1345 0x00465414	
> 	33 lookup_symbol() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\symtab.c:1268 0x00465542	
> 	32 find_imps() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\objc-lang.c:1319 0x004c1535	
> 	31 decode_objc() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\linespec.c:1129 0x0049a968	
> 	30 decode_line_1() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\linespec.c:746 0x0049b796	
> 	29 do_captured_parse_breakpoint() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\breakpoint.c:5556 0x004447d0	
> 	28 catch_exception() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\exceptions.c:462 0x00412142	
> 	27 break_command_really() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\breakpoint.c:5709 0x004466a8	
> 	26 set_breakpoint() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\breakpoint.c:5887 0x004471b8	
> 	25 mi_cmd_break_insert() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\mi\mi-cmd-break.c:162 0x0051c7f9	
> 	24 captured_mi_execute_command() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\mi\mi-main.c:1369 0x00519c37	
> 	23 catch_exception() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\exceptions.c:462 0x00412142	
> 	22 mi_execute_command() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\mi\mi-main.c:1270 0x00519499	
> 	21 mi_execute_command_wrapper() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\mi\mi-interp.c:251 0x004a4729	
> 	20 mi_interpreter_exec() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\mi\mi-interp.c:164 0x004a4773	
> 	19 interp_exec() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\interps.c:326 0x0041c78b	
> 	18 interpreter_exec_cmd() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\interps.c:403 0x0041c869	
> 	17 execute_command() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\top.c:442 0x00402507	
> 	16 command_handler() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\event-top.c:511 0x00424b0f	
> 	15 command_line_handler() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\event-top.c:741 0x00424e3f	
> 	14 rl_callback_read_char() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\readline\callback.c:205 0x0057b065	
> 	13 rl_callback_read_char_wrapper() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\event-top.c:178 0x004244bb	
> 	12 handle_file_event() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\event-loop.c:812 0x0043e93a	
> 	11 process_event() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\event-loop.c:394 0x0043e38b	
> 	10 gdb_do_one_event() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\event-loop.c:459 0x0043f05c	
> 	9 catch_errors() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\exceptions.c:510 0x0041238b	
> 	8 start_event_loop() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\event-loop.c:483 0x0043e3f4	
> 	7 cli_command_loop() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\event-top.c:211 0x004246ed	
> 	6 captured_command_loop() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\main.c:226 0x004012ab	
> 	5 catch_errors() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\exceptions.c:510 0x0041238b	
> 	4 captured_main() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\main.c:902 0x00401a24	
> 	3 catch_errors() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\exceptions.c:510 0x0041238b	
> 	2 gdb_main() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\main.c:911 0x00402203	
> 	1 main() \cygdrive\d\Install\GDB\gdb-6.8.50.20090603\gdb\gdb.c:33 0x0040109b	
> 
> 
> -----Original Message-----
> From: Richard Earnshaw <member@buzzard.freeserve.co.uk>
> To: Dmitry Smirnov <divis1969@mail.ru>, gdb@sourceware.org
> Date: Mon,  8 Jun 2009 17:36:12 +0200 (CEST)
> Subject: RE: Crash in gdb
> 
> > 
> > >  I had encountered a problem with running gdb-6.8.50.20090603.
> >  > It is configured as ./configure --target arm-elf --with-x=no --disable-tui
> >  > I would like to note that there no such a problem with gdb-6.8.50.20090412 or gdb-6.8.50.20080630.
> >  
> >  > warning: unknown ARM EABI version 0x2000000
> >  
> > This suggests you are using an old version of ARM's toolchain.  That's not supported in GDB.
> > 
> > R.
> > 
> 
>
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