pwndbg> r
Starting program: /home/xxx/workplace/fuzz_share-master/pycparser-git/pyc_parser ./pyc_null_ptr.pyc
[Info] : MAGIC NUMBER 0xa0df303
[Info] : Valid Pyc File!
[Info] : Last Modified Time : Mon Oct 21 22:13:29 2019



==================== Begin Code ====================
***** Code *****
[String]
string length: 44
***** Consts *****
Can't reach this point
***** Names *****
Can't reach this point
***** varNames *****
Can't reach this point
***** freeVars *****
Can't reach this point
***** cellVars *****
Can't reach this point
***** fileName *****
Can't reach this point
***** name *****
Can't reach this point
***** firstLineNo *****
value:1912603243
***** lnotab *****
Can't reach this point

Program received signal SIGSEGV, Segmentation fault.
0x0000000000404429 in PycParser::ParseOpCode (this=0x7fffffffd990, code=0x60b860, lnotab=0x0, firstLine=1912603243) at ./include/PycParser.h:331
331			if(lnotab->type != &PyString_Type)
LEGEND: STACK | HEAP | CODE | DATA | RWX | RODATA
───────────────────────────────────────────────────────────────────────────────[ REGISTERS ]────────────────────────────────────────────────────────────────────────────────
 RAX  0x0
 RBX  0x7ffff78bbda0 (result) ◂— 'Mon Oct 21 22:13:29 2019\n'
 RCX  0x7200026b
 RDX  0x0
 RDI  0x7fffffffd990 ◂— 0x160000031d
 RSI  0x60b860 ◂— 0x7fff00000001
 R8   0x7ffff7fbc780 ◂— 0x7ffff7fbc780
 R9   0x7ffff7fbc780 ◂— 0x7ffff7fbc780
 R10  0xcccccccccccccccd
 R11  0x246
 R12  0x4018e0 (_start) ◂— xor    ebp, ebp
 R13  0x7fffffffe0f0 ◂— 0x2
 R14  0x0
 R15  0x0
 RBP  0x7fffffffd3f0 —▸ 0x7fffffffd920 —▸ 0x7fffffffd960 —▸ 0x7fffffffe010 ◂— 0x0
 RSP  0x7fffffffd390 ◂— 0x7200026bffffe0f0
 RIP  0x404429 ◂— mov    rax, qword ptr [rax + 8]
─────────────────────────────────────────────────────────────────────────────────[ DISASM ]─────────────────────────────────────────────────────────────────────────────────
 ► 0x404429    mov    rax, qword ptr [rax + 8]
   0x40442d    cmp    rax, PyString_Type <0x60a340>
   0x404433    je     0x40445b
    ↓
   0x40445b    mov    rax, qword ptr [rbp - 0x50]
   0x40445f    mov    rdi, rax
   0x404462    call   PyString_GetRawString(tagPyObject*) <0x40626a>
 
   0x404467    mov    qword ptr [rbp - 0x10], rax
   0x40446b    mov    rax, qword ptr [rbp - 0x10]
   0x40446f    mov    qword ptr [rbp - 0x20], rax
   0x404473    mov    rax, qword ptr [rbp - 0x50]
   0x404477    mov    rdi, rax
─────────────────────────────────────────────────────────────────────────────[ SOURCE (CODE) ]──────────────────────────────────────────────────────────────────────────────
In file: /home/xxx/workplace/fuzz_share-master/pycparser-git/include/PycParser.h
   326 		{
   327 			cout << "[Error]ParseOpCode : code is not a PyStringObject" << endl;
   328 			exit(1);
   329 		}
   330 
 ► 331 		if(lnotab->type != &PyString_Type)
   332 		{
   333 			cout << "[Error]ParseOpCode : lnotab is not a PyStringObject" << endl;
   334 			exit(1);
   335 		}
   336 
─────────────────────────────────────────────────────────────────────────────────[ STACK ]──────────────────────────────────────────────────────────────────────────────────
00:0000│ rsp  0x7fffffffd390 ◂— 0x7200026bffffe0f0
01:0008│      0x7fffffffd398 ◂— 0x0
02:0010│      0x7fffffffd3a0 —▸ 0x60b860 ◂— 0x7fff00000001
03:0018│      0x7fffffffd3a8 —▸ 0x7fffffffd990 ◂— 0x160000031d
04:0020│      0x7fffffffd3b0 —▸ 0x60a301 (PyNone_Type+1) ◂— 0xc000000000000000
05:0028│      0x7fffffffd3b8 —▸ 0x7ffff78bbda0 (result) ◂— 'Mon Oct 21 22:13:29 2019\n'
06:0030│      0x7fffffffd3c0 —▸ 0x7fffffffd3f0 —▸ 0x7fffffffd920 —▸ 0x7fffffffd960 —▸ 0x7fffffffe010 ◂— ...
07:0038│      0x7fffffffd3c8 —▸ 0x404933 ◂— leave  
───────────────────────────────────────────────────────────────────────────────[ BACKTRACE ]────────────────────────────────────────────────────────────────────────────────
 ► f 0           404429
   f 1           404288 PycParser::ReadObject()+3686
   f 2           403363
   f 3           402bff main+131
   f 4     7ffff7518f45 __libc_start_main+245
────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
Program received signal SIGSEGV (fault address 0x8)
pwndbg> p lnotab
$1 = (PyObject *) 0x0
pwndbg> 

https://github.com/hac425xxx/fuzzdata/blob/master/pyc_null_ptr.pyc