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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - exitLld() deallocates MemoryBuffer which may back a section name being concurrently accessed by another thread"
href="https://bugs.llvm.org/show_bug.cgi?id=48146">48146</a>
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<th>Summary</th>
<td>exitLld() deallocates MemoryBuffer which may back a section name being concurrently accessed by another thread
</td>
</tr>
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<th>Product</th>
<td>lld
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>ELF
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>i@maskray.me
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, smithp352@googlemail.com
</td>
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<p>
<div>
<pre>The issue of low priority as it happens after the error limit is reached
so there is no loss of diagnostics.
When linking one executable, I observe that thread 1 and thread 6 are running
`parallelForEachN` code in `OutputSection::writeTo` (for the output section
`.text`) and are both reporting a relocation out-of-range error.
thread 6 emits an error and calls `exitLld` (since the error limit is reached)
which calls:
```
llvm::sys::Process::Exit(val)
SpecificBumpPtrAllocator<lld::elf::SymbolTable>::~SpecificBumpPtrAllocator
SpecificBumpPtrAllocator<lld::elf::SymbolTable>::DestroyAll
// The MemoryBuffer backing the section name accessed by thread 1 has been
deallocated
```
thread 1 is calling `InputSectionBase::getLocation` and fails because the
section name it is accessing has been deallocated by thread 6.</pre>
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</p>
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