mai*_*rgs 2 c c++ x11 gdb segmentation-fault
我在一些C代码中遇到了分段错误,我无法弄清楚如何阅读这个,所以我可以找出问题..
有没有人有任何技术可以帮助我？有什么事情发生在你身上吗？
这是gdb输出:
GNU gdb 6.8 for GNAT Pro 6.2.1 (20090115) [rev:143235] Copyright (C) 2008 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later This is free software: you are free to change and redistribute it. See your support agreement for details of warranty and support. If you do not have a current support agreement, then there is absolutely no warranty for this version of GDB. Type "show copying" and "show warranty" for details. This GDB was configured as "sparc-sun-solaris2.8"... Reading symbols from /usr/lib/libsocket.so.1...done. Loaded symbols for /usr/lib/libsocket.so.1 Reading symbols from /usr/lib/libnsl.so.1...done. Loaded symbols for /usr/lib/libnsl.so.1 Reading symbols from /usr/lib/libgen.so.1...done. Loaded symbols for /usr/lib/libgen.so.1 Reading symbols from /usr/lib/libintl.so.1... warning: Lowest section in /usr/lib/libintl.so.1 is .dynamic at 00000074 done. Loaded symbols for /usr/lib/libintl.so.1 Reading symbols from /usr/lib/libw.so.1... warning: Lowest section in /usr/lib/libw.so.1 is .dynamic at 00000074 done. Loaded symbols for /usr/lib/libw.so.1 Reading symbols from /usr/lib/libm.so.1...done. Loaded symbols for /usr/lib/libm.so.1 Reading symbols from /opt/services/AZJCommonZJX/solaris/lib/libazjcommonjcxC.so...done. Loaded symbols for /opt/services/AZJCommonZJX/solaris/lib/libazjcommonjcxC.so Reading symbols from /usr/openwin/lib/libXext.so.0...done. Loaded symbols for /usr/openwin/lib/libXext.so.0 Reading symbols from /usr/openwin/lib/libX11.so.4...done. Loaded symbols for /usr/openwin/lib/libX11.so.4 Reading symbols from /usr/openwin/lib/libXmu.so.4...done. Loaded symbols for /usr/openwin/lib/libXmu.so.4 Reading symbols from /usr/openwin/lib/libXt.so.4...done. Loaded symbols for /usr/openwin/lib/libXt.so.4 Reading symbols from /usr/dt/lib/libXm.so.3...done. Loaded symbols for /usr/dt/lib/libXm.so.3 Reading symbols from /usr/lib/libc.so.1...done. Loaded symbols for /usr/lib/libc.so.1 Reading symbols from /opt/services/AZJCommonWork/solaris/lib/libazjcommonwork.so...done. Loaded symbols for /opt/services/AZJCommonWork/solaris/lib/libazjcommonwork.so Reading symbols from /opt/services/AZJCommonWork/solaris/lib/libazjcommonworkC.so...done. Loaded symbols for /opt/services/AZJCommonWork/solaris/lib/libazjcommonworkC.so Reading symbols from /app/gnatpro6.2.1/lib/gcc/sparc-sun-solaris2.8/4.3.3/rts-native/adalib/libgnarl-6.2.so...done. Loaded symbols for /opt/tools/SunOS/gnatpro6.2.1/lib/gcc/sparc-sun-solaris2.8/4.3.3/adalib/libgnarl-6.2.so Reading symbols from /app/gnatpro6.2.1/lib/gcc/sparc-sun-solaris2.8/4.3.3/rts-native/adalib/libgnat-6.2.so...done. Loaded symbols for /opt/tools/SunOS/gnatpro6.2.1/lib/gcc/sparc-sun-solaris2.8/4.3.3/adalib/libgnat-6.2.so Reading symbols from /usr/lib/libpthread.so.1... warning: Lowest section in /usr/lib/libpthread.so.1 is .dynamic at 00000074 done. Loaded symbols for /usr/lib/libpthread.so.1 Reading symbols from /usr/lib/librt.so.1...done. Loaded symbols for /usr/lib/librt.so.1 Reading symbols from /app/gnatpro6.2.1/lib/libstdc++.so.6...done. Loaded symbols for /opt/tools/SunOS/gnatpro6.2.1/lib/libstdc++.so.6 Reading symbols from /app/gnatpro6.2.1/lib/libgcc_s.so.1...done. Loaded symbols for /opt/tools/SunOS/gnatpro6.2.1/lib/libgcc_s.so.1 Reading symbols from /usr/lib/libthread.so.1... warning: Lowest section in /usr/lib/libthread.so.1 is .dynamic at 00000074 done. Loaded symbols for /usr/lib/libthread.so.1 Reading symbols from /usr/lib/libaio.so.1...done. Loaded symbols for /usr/lib/libaio.so.1 Reading symbols from /usr/lib/libmd.so.1...done. Loaded symbols for /usr/lib/libmd.so.1 Reading symbols from /usr/lib/libm.so.2...done. Loaded symbols for /usr/lib/libm.so.2 Reading symbols from /platform/sun4v/lib/libc_psr.so.1...done. Loaded symbols for /platform/SUNW,Sun-Fire-T200/lib/libc_psr.so.1 Reading symbols from /lib/ld.so.1...done. Loaded symbols for /lib/ld.so.1 Core was generated by `./solaris/apsui -aps_instance 1006 -aps_ato 0 -reject_menu_tearoff -aps_ipc_'. Program terminated with signal 11, Segmentation fault. [New process 75224 ] #0 0x7f1e4d00 in _XmGetFocusData () from /usr/dt/lib/libXm.so.3
这是gdb backtrace完整显示的内容:
(gdb) bt full
#0 0x7f1e4d00 in _XmGetFocusData () from /usr/dt/lib/libXm.so.3
No symbol table info available.
#1 0x7f1e2768 in _XmNavigInitialize () from /usr/dt/lib/libXm.so.3
No symbol table info available.
#2 0x7f1e8adc in Initialize () from /usr/dt/lib/libXm.so.3
No symbol table info available.
#3 0x7f357760 in CallInitialize () from /usr/openwin/lib/libXt.so.4
No symbol table info available.
#4 0x7f3576b4 in CallInitialize () from /usr/openwin/lib/libXt.so.4
No symbol table info available.
#5 0x7f3576b4 in CallInitialize () from /usr/openwin/lib/libXt.so.4
No symbol table info available.
#6 0x7f353804 in xtCreate () from /usr/openwin/lib/libXt.so.4
No symbol table info available.
#7 0x7f35bf0c in _XtCreateWidget () from /usr/openwin/lib/libXt.so.4
No symbol table info available.
#8 0x7f35bc8c in XtCreateWidget () from /usr/openwin/lib/libXt.so.4
No symbol table info available.
#9 0x7f6026f8 in create_my_window (win=0xd3bc0)
at /opt/services/AZJCommonZJX/src/uim/create/create_my_window.c:180
n_args = 0
args = {{name = 0x0, value = 0} }
err_msg = '\0' , "ÿ¿Ïä", '\0' , "main_window_menu\000T_CMD MARITIME_TGT_CMD TEST \000K1\177}al\000\000\000\004\000\000\000\001\000\000\000\000"...
shell = (Widget) 0xd50b8
object_width = 0
object_height = 1660944384
window_name = "TBM_PrimaryWin\000ä\000\000\000\000\177ÿÿø\177ÿü\000\177\023\222¤\000\000 \000\000\f\215ð\000\f\217 \177\023\222¬\177ÿü\000\000\000\000\000ÿ¿Î\200\177\005f,\000\000\000\000\177\023Vx\000\fO \000\aÀ\020\000\fO \1772*\000ui_ipc_xref."
icon_pixmap = 8332422
obj = (gen_obj_list_t *) 0x6b0
vis = (vis_list_t *) 0x7f832bb8
toolbar = (toolbar_t *) 0x0
#10 0x7f5f524c in create_my_window (in_buff=0x19750 "main_window_menu")
at /opt/services/AZJCommonZJX/src/uim/create/create_my_window.c:431
func_name = "create_my_window"
str = "\000\000\000\000\000\000\000\000¿¿Ä6'yC \000\000\000\000\000\000\000\000\177\235p0\000\000\000\000\000\003eÈ\000\003e¸\000\000\000\004ÿÿ\000\000\000\000\000\000ÿÿÿß\000\000\000\017\000\000\000\017\000\003^\200ÿ¿Ô\000\000\000\000\000\000\000\000\001\000\000\000\004\000\000\000\017ÿ¿Ó \177\2133, "\001\000\000\000\234\000\000\000\000\000\000\000\036\000\000\000\000\000\rP\000ÿ¿Ô \177\213\022\020\000"...
ptr = 0x19760 ""
keyword = 0x8a130 ""
window_name = 0x8a130 ""
---Type to continue, or q to quit---
title_name = "\000¿ÒØ\177\211îÄ\000\000\000\000\000\000\000\004", '\0' , "\003e¸\000\000\000\004ÿÿ\000\000\000\000\000\000ÿÿÿß\000\000\000\017\000\000\000 \000\001\023T\177¿sÈ\177·\fà\005øص\000\000\000@\177·\020Xÿ¿Ó8"
full_title_name = 0x2b870 "TAP"
object_width = 2141025804
object_height = 1
window_width = 0
window_height = 0
first_object = 1
other_obj = 0
centered_max_width = 18866798
这是dbx输出:
For information about new features see `help changes'
To remove this message, put `dbxenv suppress_startup_message 7.7' in your .dbxrc
Reading apsui
core file header read successfully
Reading ld.so.1
Reading libsocket.so.1
Reading libnsl.so.1
Reading libgen.so.1
Reading libintl.so.1
Reading libw.so.1
Reading libm.so.1
Reading librt.so.1
Reading libazjcommonjcxC.so
Reading libXext.so.0
Reading libX11.so.4
Reading libXmu.so.4
Reading libXt.so.4
Reading libXm.so.3
Reading libazjcommonwork.so
Reading libazjcommonworkC.so
Reading libgnarl-6.2.so
Reading libgnat-6.2.so
Reading libpthread.so.1
Reading libc.so.1
Reading libaio.so.1
Reading libmd.so.1
Reading libstdc++.so.6.0.10
Reading libgcc_s.so.1
Reading libthread.so.1
Reading libm.so.2
Reading libc_psr.so.1
t@1 (l@1) program terminated by signal SEGV (no mapping at the fault address)
0x7f264d00: _XmGetFocusData+0x0098: ld [%o0], %o1
Current function is create_my_window
180 win->main_window = MyWindow(shell, win->name, args, n_args);
>check -all
access checking - ON
memuse checking - ON
Running: apsui
(process id 18052)
Reading rtcapihook.so
Reading libdl.so.1
Reading rtcaudit.so
Reading libmapmalloc.so.1
Reading rtcboot.so
Reading librtc.so
RTC: Enabling Error Checking...
RTC: Using UltraSparc trap mechanism
RTC: See `help rtc showmap' and `help rtc limitations' for details.
RTC: Running program...
azjcommonworkdummy.adb elaborated
User Interface version TOOLKIT : 22 MAR 2010 UIMPID=18052
Read from unallocated (rua) on thread 1:
Attempting to read 4 bytes through NULL pointer
t@1 (l@1) stopped in _XmGetFocusData at 0x5d164d00
0x5d164d00: _XmGetFocusData+0x0098: ld [%o0], %o1
Current function is create_my_window
180 win->main_window = MyWindow(shell, win->name, args, n_args);
这是我可以修改的堆栈跟踪中的最后一个函数调用(不在外部库中 - 在uicr_xmcreate_window中)..这个类的完整代码可以在这里看到:http: //utilitybase.com/paste/26607
void create_my_window( window_t *win)
{
Cardinal n_args;
Arg args[MAX_ARGS];
Widget shell = NULL;
//MORE STUFF HERE
memset(&(args), 0, sizeof(Arg)*MAX_ARGS); n_args = 0;
if (win->attributes != PRIMARY_WINDOW) {
XtSetArg(args[n_args], XmNtopAttachment, XmATTACH_FORM); n_args++;
XtSetArg(args[n_args], XmNbottomAttachment, XmATTACH_FORM); n_args++;
XtSetArg(args[n_args], XmNleftAttachment, XmATTACH_FORM); n_args++;
XtSetArg(args[n_args], XmNrightAttachment, XmATTACH_FORM); n_args++;
XtSetArg(args[n_args], XmNtopOffset, 0); n_args++;
XtSetArg(args[n_args], XmNbottomOffset, 0); n_args++;
XtSetArg(args[n_args], XmNleftOffset, 0); n_args++;
XtSetArg(args[n_args], XmNrightOffset, 0); n_args++;
}
win->main_window = XmCreateMainWindow(shell, win->name, args, n_args);
编辑
我在函数调用之前在gdb中添加了一个断点,并打印出一些值(不确定这是否有用 - 我是一个n00b):
Breakpoint 1, create_my_window (win=0x9b378)
at /opt/services/AZJCommonZJX/src/jzs/create/create_my_window.c:179
179 printf("%d",n_args);
(gdb) p *win
$1 = {struct_type = 1045, next = 0x0, hash_name = 971,
name = 0x994e8 "error_log", widget = 0x0, main_window = 0x0, workarea = 0x0,
menu_bar = 0x0, message_window = 0x0, window_RC = 0x0, working_box = 0,
working_identifier = 0x0, has_message_area = 0, pos = {x = 0, y = 0},
illegal_char_set = 0x0, height = 0, width = 0, configured = 0,
actions = 0x0, title = 0x99d18, help_text = 0x0, groups = 0x0,
scroll_bars = 0x0, write_protect = 0, attributes = 0, initial_focus = {
obj_type = 0, obj_name = 0x0, area = 0x0}, text_edit = {
text_selected_widget = 0x0, text_focus_widget = 0x0, updated_widget = 0x0,
start = 0, end = 0, updated_text = 0x0, last_operation = 0},
close_rqt = 0x0, kill_application_action_list_name = 0x0, parent = 0x0,
gen_objs = 0x99da0, panes = 0x0, table_list = 0x0, selected_table = 0x0,
dialogs = 0x0, has_been_loaded = 0 '\0', source_file_name = 0x0}
(gdb) p *shell
$2 = {core = {self = 0x9db50, widget_class = 0xfec7897c, parent = 0x0,
xrm_name = 466, being_destroyed = 0 '\0', destroy_callbacks = 0x9ae58,
constraints = 0x0, x = 0, y = 0, width = 0, height = 0, border_width = 1,
managed = 0 '\0', sensitive = 1 '\001', ancestor_sensitive = 1 '\001',
event_table = 0x9ad98, tm = {translations = 0x0, proc_table = 0x0,
current_state = 0x0, lastEventTime = 0}, accelerators = 0x0,
border_pixel = 0, border_pixmap = 2, popup_list = 0x0, num_popups = 0,
name = 0x7776e "TBM_Dialog_Fixed", screen = 0x7a7e0, colormap = 32,
window = 0, depth = 24, background_pixel = 12825262,
background_pixmap = 2, visible = 1 '\001', mapped_when_managed = 1 '\001'}}
(gdb) p *args
$3 = {name = 0x0, value = 0}
(gdb) p *n_args
Cannot access memory at address 0x0
(gdb) p n_args
$4 = 0
(gdb) p args
$5 = {{name = 0x0, value = 0} <repeats 20 times>}
鉴于dbx说"尝试通过NULL指针读取4个字节",并且错误是在函数调用的行上报告而不是在XmCreateMainWindow函数内部,我认为问题与语句有关win->name.这是C行的唯一位置,在实际调用函数之前,您将从指针读取它(它将读取存储在其中的数据win->name的副本并将副本传递给函数).
尝试在呼叫上方的线路上插入以下内容 XmCreateMainWindow
assert(win != NULL);
#include <assert.h>如果还没有,你将需要.这应该win在调用函数时验证它不是NULL指针.为了彻底,您可能还想添加类似的行shell.