即使地址空间可访问，也会出现段错误 [英] Seg fault even though address space is accessible

问题描述

大家好，


访问结构元素时出现分段错误。

我粘贴了gdb和backtrace的输出。


但是，如果我能够使用gdb输出中的

地址成功访问该结构

之后出现seg故障。 gdb的输出也在下面给出。


任何想法都会发生这种情况吗？

是的我试图访问它所在的结构元素

出错。


我肯定遗漏了什么。

感谢任何帮助！


谢谢，

Ajay。


$$$$$$$$$$$$$ SEG FAULT $$$$$$$$$$ $$$$$$


程序收到信号SIGSEGV，分段错误。

checkBFVectorList（BFVecList = 0x84187a0，BFlen = 699）

at compute_sticky_IP_per_ASN.c：776

776 vector = vector-> nextVector;


$$$$$$$$$$$$ $$$ BT $$$$$$$$$$$$$$$$$$$$


（gdb）bt

＃0 checkBFVectorList（BFVecList = 0x84187a0，BFlen = 699）

at compute_sticky_IP_per_ASN.c：776

＃1 0x08051bb3 in buildPeerDetailStructFromLine（line = 0x8418dd0" 566"，

peerStruct = 0x8047124）at compute_sticky_IP_per_ASN.c：752

＃2 0x080522c1 in m ain（argc = 11，argv = 0x8047348）

at compute_sticky_IP_per_ASN.c：179


$$$$$$$$$$$$$ $$$$$$ ACCESSING STRUCTURE $$$$$$$$$$$$$$$$$$$

（gdb）p *（bitfieldItemStruct *）0x84187a0

$ 1 = {BFVector = 3309413121，nextVector = 0x84187b0}

（gdb）p（（bitfieldItemStruct *）0x84187a0） ​​- > nextVector

$ 2 =（struct bitfieldItem *）0x84187b0

（gdb）p（（struct bitfieldItem *）0x84187a0） ​​- > nextVector

$ 3 =（struct bitfieldItem *）0x84187b0

Hi All,

I got a segmentation fault while accessing a structure element.
I pasted the output from gdb and the backtrace.

However if I am able successfully access the structure using the
address from the gdb output
after it seg faulted. Output from gdb also give below.

Any idea y this is happening?
yes I am trying to access the structure element from where it seg
faulted.

I am surely missing something.
Any help is appreciated!

Thanks,
Ajay.

$$$$$$$$$$$$$ SEG FAULT $$$$$$$$$$$$$$$$$

Program received signal SIGSEGV, Segmentation fault.
checkBFVectorList (BFVecList=0x84187a0, BFlen=699)
at compute_sticky_IP_per_ASN.c:776
776 vector = vector->nextVector;

$$$$$$$$$$$$$$$$ BT $$$$$$$$$$$$$$$$$$$$

(gdb) bt
#0 checkBFVectorList (BFVecList=0x84187a0, BFlen=699)
at compute_sticky_IP_per_ASN.c:776
#1 0x08051bb3 in buildPeerDetailStructFromLine (line=0x8418dd0 "566",
peerStruct=0x8047124) at compute_sticky_IP_per_ASN.c:752
#2 0x080522c1 in main (argc=11, argv=0x8047348)
at compute_sticky_IP_per_ASN.c:179

$$$$$$$$$$$$$$$$$$$$ ACCESSING STRUCTURE $$$$$$$$$$$$$$$$$$$

(gdb) p *(bitfieldItemStruct *) 0x84187a0
$1 = {BFVector = 3309413121, nextVector = 0x84187b0}
(gdb) p ((bitfieldItemStruct *) 0x84187a0)->nextVector
$2 = (struct bitfieldItem *) 0x84187b0
(gdb) p ((struct bitfieldItem *) 0x84187a0)->nextVector
$3 = (struct bitfieldItem *) 0x84187b0

推荐答案

赛格故障

程序接收信号SIGSEGV，分段错误。

checkBFVectorList（BFVecList = 0x84187a0，BFlen = 699）

at compute_sticky_IP_per_ASN.c：776

776 vector = vector-> nextVector;

Program received signal SIGSEGV, Segmentation fault.
checkBFVectorList (BFVecList=0x84187a0, BFlen=699)
at compute_sticky_IP_per_ASN.c:776
776 vector = vector->nextVector;

BT

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