Seg fault even though address space is accessible

[Todimala]

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

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