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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Infinite recursion in StackProtector::HasAddressTaken due to self-referencing code in dead basic block"
href="https://bugs.llvm.org/show_bug.cgi?id=40436">40436</a>
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<th>Summary</th>
<td>Infinite recursion in StackProtector::HasAddressTaken due to self-referencing code in dead basic block
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Common Code Generator Code
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>mikael.holmen@ericsson.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=21376" name="attach_21376" title="reproducer">attachment 21376</a> <a href="attachment.cgi?id=21376&action=edit" title="reproducer">[details]</a></span>
reproducer
Reproduce with
llc -mtriple=x86_64-unknown-unknown -start-before=stack-protector
-stop-after=stack-protector stack-protector-unreachable-code.ll
The input looks like this:
define void @f() sspreq {
entry:
%ai = alloca i8, align 1
ret void
dead:
%user = select i1 undef, i8* %ai, i8* %user
unreachable
}
The problem occurs when StackProtector::HasAddressTaken is called on
%ai = alloca i8, align 1
and then
%user = select i1 undef, i8* %ai, i8* %user
since HasAddressTaken will be called on
%user = select i1 undef, i8* %ai, i8* %user
over and over again until the stack is blown.
Since the instruction is in a unreachable basic block the input is ok even if
it normally isn't.</pre>
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