GDB says: Program received signal SIGTRAP in ntdll.dll

Niunio

Folowing with this: I've learned how to use gdb and I think I've found where the error is.

There is the code line:

...
/* In the header file */
typedef double BAS_NUMBER;
...
5 
/* Somewhere in the initialization */
basDataStackSize = 512;
...
9 
/* In the function */
struct _PILA_DATOS_ *Resultado = NULL;
12 
if ((Resultado = (struct _PILA_DATOS_*)malloc(sizeof(struct _PILA_DATOS_)))
    != NULL)
{
  Resultado->Dato = NULL; Resultado->Tipo = NULL;
  if ((Resultado->Dato = (BAS_NUMBER*)malloc (
    sizeof(BAS_NUMBER) * basDataStackSize)) != NULL)
  {
  ...

And this is what gdb says:

139        struct _PILA_DATOS_ *Resultado = NULL;
2(gdb) n
341        if ((Resultado = (struct _PILA_DATOS_*)malloc(sizeof(struct _PILA_DATOS_)))
4(gdb)
544          Resultado->Dato = NULL; Resultado->Tipo = NULL;
6(gdb) p basDataStackSize
7$15 = 512
8(gdb) n
945          if ((Resultado->Dato = (BAS_NUMBER*)malloc (
10(gdb) n
11warning: HEAP[basrun.exe]:
12warning: HEAP: Free Heap block 3d57f8 modified at 3d580c after it was freed
13 
14 
15Program received signal SIGTRAP, Trace/breakpoint trap.
160x7c911231 in ntdll!DbgUiConnectToDbg () from ntdll.dll
17(gdb) p Resultado->Dato
18No symbol "Resultado" in current context.
19(gdb) n
20Single stepping until exit from function ntdll!DbgUiConnectToDbg,
21which has no line number information.
220x7c97c943 in ntdll!RtlpNtMakeTemporaryKey () from ntdll.dll
23(gdb) n
24Single stepping until exit from function ntdll!RtlpNtMakeTemporaryKey,
25which has no line number information.
260x7c959a2e in ntdll!RtlInsertElementGenericTableAvl () from ntdll.dll
27(gdb) n
28Single stepping until exit from function ntdll!RtlInsertElementGenericTableAvl,
29 
30which has no line number information.
310x7c921e8f in ntdll!RtlInitializeHandleTable () from ntdll.dll
32(gdb) n
33Single stepping until exit from function ntdll!RtlInitializeHandleTable,
34which has no line number information.
350x7c920c31 in wcsncpy () from ntdll.dll
36(gdb) n
37Single stepping until exit from function wcsncpy,
38which has no line number information.
390x7c928251 in ntdll!RtlRealPredecessor () from ntdll.dll
40(gdb) n
41Single stepping until exit from function ntdll!RtlRealPredecessor,
42which has no line number information.
430x7c921b54 in ntdll!RtlInitializeHandleTable () from ntdll.dll
44(gdb) n
45Single stepping until exit from function ntdll!RtlInitializeHandleTable,
46which has no line number information.
470x7c94c087 in ntdll!RtlInsertElementGenericTableAvl () from ntdll.dll
48(gdb) n
49Single stepping until exit from function ntdll!RtlInsertElementGenericTableAvl,
50 
51which has no line number information.
520x7c9130f5 in ntdll!RtlFindCharInUnicodeString () from ntdll.dll
53(gdb) n
54Single stepping until exit from function ntdll!RtlFindCharInUnicodeString,
55which has no line number information.
560x7c94c0a0 in ntdll!RtlInsertElementGenericTableAvl () from ntdll.dll
57(gdb) n
58Single stepping until exit from function ntdll!RtlInsertElementGenericTableAvl,
59 
60which has no line number information.
610x7c921bba in ntdll!RtlInitializeHandleTable () from ntdll.dll
62(gdb) n
63Single stepping until exit from function ntdll!RtlInitializeHandleTable,
64which has no line number information.
650x7c920c86 in wcsncpy () from ntdll.dll
66(gdb) n
67Single stepping until exit from function wcsncpy,
68which has no line number information.
690x7c921bdc in ntdll!RtlInitializeHandleTable () from ntdll.dll
70(gdb) n
71Single stepping until exit from function ntdll!RtlInitializeHandleTable,
72which has no line number information.
730x7c920bcc in wcsncpy () from ntdll.dll
74(gdb) n
75Single stepping until exit from function wcsncpy,
76which has no line number information.
770x7c921bff in ntdll!RtlInitializeHandleTable () from ntdll.dll
78(gdb) c <<< I was boring so I decided to continue.
79Continuing.
80 
81Uso:
82        basrun <archivo.prg>
83 
84warning: HEAP[basrun.exe]:
85warning: Heap block at 003D24A8 modified at 003D2539 past requested size of 89
86 
87 
88Program received signal SIGTRAP, Trace/breakpoint trap.
890x7c911231 in ntdll!DbgUiConnectToDbg () from ntdll.dll
90(gdb) c
91Continuing.
92warning: HEAP[basrun.exe]:
93warning: Invalid Address specified to RtlFreeHeap( 003D0000, 003D24B0 )
94 
95 
96Program received signal SIGTRAP, Trace/breakpoint trap.
970x7c911231 in ntdll!DbgUiConnectToDbg () from ntdll.dll
98(gdb) c
99Continuing.
100warning: HEAP[basrun.exe]:
101warning: Heap block at 003D52E0 modified at 003D57E8 past requested size of 500
102 
103 
104Program received signal SIGTRAP, Trace/breakpoint trap.
1050x7c911231 in ntdll!DbgUiConnectToDbg () from ntdll.dll
106(gdb) c
107Continuing.
108warning: HEAP[basrun.exe]:
109warning: Invalid Address specified to RtlFreeHeap( 003D0000, 003D52E8 )
110 
111 
112Program received signal SIGTRAP, Trace/breakpoint trap.
1130x7c911231 in ntdll!DbgUiConnectToDbg () from ntdll.dll
114(gdb) c
115Continuing.
116 
117Program exited with code 01.
118(gdb)

What's happening?

CGamesPlay

I think this is a delayed error. I think you free something and then modify it later, and the system catches it next time it does a malloc. In conclusion, make sure you set variables to NULL after you delete them, and try it out.

Niunio

I don't think so. Anyway I've checked all "free" calls I do in all modules and I set all variables to NULL after delete them and also before create them (malloc) and I have same the error.

ReyBrujo

Unluckily CGP is right. You have a buffer overrun somewhere in your code. Your best chance is beginning to comment code until you have your program running, and then adding code until it breaks again.

Niunio

Find it. Oh, man! That was the most stupid error I've done ever: I just put "Cnt<=basNumLabels" instead of "Cnt<basNumLabels" in a for loop :-[ . Now it runs.

But I can't understand why it fails in Windows but run perfect in GNU/Linux.

Anyway, thanks: you make me think and check each bit of the program. I thought I never find it. Can't send cookies, sorry :-[ but I'll thank you in the "readme" file of the final release

CGamesPlay

The reason is that MSVCRT's debugging library does heap checking, and GNU/Linux's glibc doesn't (well, maybe the debugging version does, but I doubt you were using it). Valgrind would have found this error, though.

ReyBrujo

It is not on by default, there must be a switch to turn it on.

Thread #581664. Printed from Allegro.cc

1	...
2	/* In the header file */
3	typedef double BAS_NUMBER;
4	...
5
6	/* Somewhere in the initialization */
7	basDataStackSize = 512;
8	...
9
10	/* In the function */
11	struct _PILA_DATOS_ *Resultado = NULL;
12
13	if ((Resultado = (struct _PILA_DATOS_*)malloc(sizeof(struct _PILA_DATOS_)))
14	!= NULL)
15	{
16	Resultado->Dato = NULL; Resultado->Tipo = NULL;
17	if ((Resultado->Dato = (BAS_NUMBER*)malloc (
18	sizeof(BAS_NUMBER) * basDataStackSize)) != NULL)
19	{
20	...

1	39 struct _PILA_DATOS_ *Resultado = NULL;
2	(gdb) n
3	41 if ((Resultado = (struct _PILA_DATOS_*)malloc(sizeof(struct _PILA_DATOS_)))
4	(gdb)
5	44 Resultado->Dato = NULL; Resultado->Tipo = NULL;
6	(gdb) p basDataStackSize
7	$15 = 512
8	(gdb) n
9	45 if ((Resultado->Dato = (BAS_NUMBER*)malloc (
10	(gdb) n
11	warning: HEAP[basrun.exe]:
12	warning: HEAP: Free Heap block 3d57f8 modified at 3d580c after it was freed
13
14
15	Program received signal SIGTRAP, Trace/breakpoint trap.
16	0x7c911231 in ntdll!DbgUiConnectToDbg () from ntdll.dll
17	(gdb) p Resultado->Dato
18	No symbol "Resultado" in current context.
19	(gdb) n
20	Single stepping until exit from function ntdll!DbgUiConnectToDbg,
21	which has no line number information.
22	0x7c97c943 in ntdll!RtlpNtMakeTemporaryKey () from ntdll.dll
23	(gdb) n
24	Single stepping until exit from function ntdll!RtlpNtMakeTemporaryKey,
25	which has no line number information.
26	0x7c959a2e in ntdll!RtlInsertElementGenericTableAvl () from ntdll.dll
27	(gdb) n
28	Single stepping until exit from function ntdll!RtlInsertElementGenericTableAvl,
29
30	which has no line number information.
31	0x7c921e8f in ntdll!RtlInitializeHandleTable () from ntdll.dll
32	(gdb) n
33	Single stepping until exit from function ntdll!RtlInitializeHandleTable,
34	which has no line number information.
35	0x7c920c31 in wcsncpy () from ntdll.dll
36	(gdb) n
37	Single stepping until exit from function wcsncpy,
38	which has no line number information.
39	0x7c928251 in ntdll!RtlRealPredecessor () from ntdll.dll
40	(gdb) n
41	Single stepping until exit from function ntdll!RtlRealPredecessor,
42	which has no line number information.
43	0x7c921b54 in ntdll!RtlInitializeHandleTable () from ntdll.dll
44	(gdb) n
45	Single stepping until exit from function ntdll!RtlInitializeHandleTable,
46	which has no line number information.
47	0x7c94c087 in ntdll!RtlInsertElementGenericTableAvl () from ntdll.dll
48	(gdb) n
49	Single stepping until exit from function ntdll!RtlInsertElementGenericTableAvl,
50
51	which has no line number information.
52	0x7c9130f5 in ntdll!RtlFindCharInUnicodeString () from ntdll.dll
53	(gdb) n
54	Single stepping until exit from function ntdll!RtlFindCharInUnicodeString,
55	which has no line number information.
56	0x7c94c0a0 in ntdll!RtlInsertElementGenericTableAvl () from ntdll.dll
57	(gdb) n
58	Single stepping until exit from function ntdll!RtlInsertElementGenericTableAvl,
59
60	which has no line number information.
61	0x7c921bba in ntdll!RtlInitializeHandleTable () from ntdll.dll
62	(gdb) n
63	Single stepping until exit from function ntdll!RtlInitializeHandleTable,
64	which has no line number information.
65	0x7c920c86 in wcsncpy () from ntdll.dll
66	(gdb) n
67	Single stepping until exit from function wcsncpy,
68	which has no line number information.
69	0x7c921bdc in ntdll!RtlInitializeHandleTable () from ntdll.dll
70	(gdb) n
71	Single stepping until exit from function ntdll!RtlInitializeHandleTable,
72	which has no line number information.
73	0x7c920bcc in wcsncpy () from ntdll.dll
74	(gdb) n
75	Single stepping until exit from function wcsncpy,
76	which has no line number information.
77	0x7c921bff in ntdll!RtlInitializeHandleTable () from ntdll.dll
78	(gdb) c <<< I was boring so I decided to continue.
79	Continuing.
80
81	Uso:
82	basrun <archivo.prg>
83
84	warning: HEAP[basrun.exe]:
85	warning: Heap block at 003D24A8 modified at 003D2539 past requested size of 89
86
87
88	Program received signal SIGTRAP, Trace/breakpoint trap.
89	0x7c911231 in ntdll!DbgUiConnectToDbg () from ntdll.dll
90	(gdb) c
91	Continuing.
92	warning: HEAP[basrun.exe]:
93	warning: Invalid Address specified to RtlFreeHeap( 003D0000, 003D24B0 )
94
95
96	Program received signal SIGTRAP, Trace/breakpoint trap.
97	0x7c911231 in ntdll!DbgUiConnectToDbg () from ntdll.dll
98	(gdb) c
99	Continuing.
100	warning: HEAP[basrun.exe]:
101	warning: Heap block at 003D52E0 modified at 003D57E8 past requested size of 500
102
103
104	Program received signal SIGTRAP, Trace/breakpoint trap.
105	0x7c911231 in ntdll!DbgUiConnectToDbg () from ntdll.dll
106	(gdb) c
107	Continuing.
108	warning: HEAP[basrun.exe]:
109	warning: Invalid Address specified to RtlFreeHeap( 003D0000, 003D52E8 )
110
111
112	Program received signal SIGTRAP, Trace/breakpoint trap.
113	0x7c911231 in ntdll!DbgUiConnectToDbg () from ntdll.dll
114	(gdb) c
115	Continuing.
116
117	Program exited with code 01.
118	(gdb)