fedora core 4下一个程序触发SIGSEGV Segmentation fault

xzcsiwh

[/opt/as]# gdb ./a.out
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This GDB was configured as "i386-redhat-linux-gnu"...Using host libthread_db library "/lib/libthread_db.so.1".

(gdb) l
1       #include <stdio.h>
2        main()
3       {
4           char a[500000][212];
5           
6           printf("==========test============\n");
7       }(gdb) b main
Breakpoint 1 at 0x804839b: file a.c, line 6.
(gdb) b 1
Breakpoint 2 at 0x804837c: file a.c, line 1.
(gdb) r
Starting program: /opt/as/a.out
Reading symbols from shared object read from target memory...done.
Loaded system supplied DSO at 0xceb000

Breakpoint 2, main () at a.c:3
3       {
(gdb) s

Breakpoint 1, main () at a.c:6
6           printf("==========test============\n");
(gdb) n

Program received signal SIGSEGV, Segmentation fault.
0x0804839e in main () at a.c:6
6           printf("==========test============\n");
(gdb) n

Program terminated with signal SIGSEGV, Segmentation fault.
The program no longer exists.
(gdb)


[/opt/as]# strace ./a.out
execve("./a.out", ["./a.out"], [/* 33 vars */]) = 0
brk(0)                                  = 0x9271000
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7fd9000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY)      = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=74659, ...}) = 0
old_mmap(NULL, 74659, PROT_READ, MAP_PRIVATE, 3, 0) = 0xb7fc6000
close(3)                                = 0
open("/lib/libc.so.6", O_RDONLY)        = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\n?B\000"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=1489572, ...}) = 0
old_mmap(0x40f000, 1219548, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x40f000
old_mmap(0x533000, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x124000) = 0x533000
old_mmap(0x537000, 7132, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x537000
close(3)                                = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7fc5000
set_thread_area({entry_number:-1 -> 6, base_addr:0xb7fc56c0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0
mprotect(0x533000, 8192, PROT_READ)     = 0
mprotect(0x40b000, 4096, PROT_READ)     = 0
munmap(0xb7fc6000, 74659)               = 0
--- SIGSEGV (Segmentation fault) @ 0 (0) ---
+++ killed by SIGSEGV +++



大家帮助分析一下

圆点坐标

有很多种可能性，把那段代码贴上来看看

xzcsiwh

(gdb) l
1       #include <stdio.h>
2        main()
3       {
4           char a[500000][212];
5           
6           printf("==========test============\n");
7       }(gdb) b main

ktdid

堆栈溢出

lenovo

数组定义的太大了吧。

xzcsiwh

mmap 分配栈大小的限制是怎样定义的，和sysctl之类的参数有关系吗？

lenovo

ulimit -a