[LLVMbugs] [Bug 10926] New: llvm-dwarfdump infinite loop

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=10926

           Summary: llvm-dwarfdump infinite loop
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: nicholas at mxc.ca
                CC: llvmbugs at cs.uiuc.edu, benny.kra at gmail.com


Created an attachment (id=7268)
 --> (http://llvm.org/bugs/attachment.cgi?id=7268)
testcase

The attached file causes an infinite loop in llvm-dwarfdump:
[...]
.debug_aranges contents:
^C
Program received signal SIGINT, Interrupt.
0x080691d1 in llvm::DWARFDebugArangeSet::extract (this=0xffffd750, data=..., 
    offset_ptr=0xffffd770) at DWARFDebugArangeSet.cpp:82
82          while (first_tuple_offset < header_size)
(gdb) bt
#0  0x080691d1 in llvm::DWARFDebugArangeSet::extract (this=0xffffd750, 
    data=..., offset_ptr=0xffffd770) at DWARFDebugArangeSet.cpp:82
#1  0x0806446d in llvm::DWARFContext::dump (this=0x80ed0d8, OS=...)
    at DWARFContext.cpp:26
#2  0x0804c00c in DumpInput (Filename=...) at llvm-dwarfdump.cpp:79
#3  0x0804d07f in
std::for_each<__gnu_cxx::__normal_iterator<std::basic_string<char>*,
std::vector<std::basic_string<char>, std::allocator<std::basic_string<char> > >
>, void (*)(llvm::StringRef const&)> (__first=..., __last=..., 
    __f=0x804bb5b <DumpInput(llvm::StringRef const&)>)
    at /usr/include/c++/4.6/bits/stl_algo.h:4302
#4  0x0804c158 in main (argc=2, argv=0xffffd9e4) at llvm-dwarfdump.cpp:94
(gdb) p first_tuple_offset
$1 = 0
(gdb) p header_size
$2 = 12
(gdb) n
83            first_tuple_offset += tuple_size;
(gdb) p tuple_size
$3 = 0
(gdb) n
82          while (first_tuple_offset < header_size)
(gdb) 
83            first_tuple_offset += tuple_size;

The .o file was built from this C code:

void test(int N, double* G) {
  for (long j = 1; j < 1000; j++)
    G[j] = G[j] + G[j-1];
}

by gcc 4.4.6.

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