<html>
    <head>
      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - LLD crashes if ARM.exidx input section is empty"
   href="https://bugs.llvm.org/show_bug.cgi?id=36598">36598</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>LLD crashes if ARM.exidx input section is empty
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>lld
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Windows NT
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>ELF
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>konstantin.schwarz@hightec-rt.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>ld.lld crashes if it is invoked with the following input

// test.s
.text
.globl _start
_start:

// linker.script
SECTIONS
{
  .foo:
  {
    exidx_start = .;
    *(.ARM.exidx*)
    exidx_end = .;
  }
}

The test.s file is assembled in the following way: 
llvm-mc -filetype=obj -triple=arm-arm-none-eabi test.s -o test.o

The program does not contain an ARM.exidx section, hence the InputSection
pointer 'First' in OutputSection::finalize is a nullptr and dereferenced later
on.</pre>
        </div>
      </p>


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