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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - stack-probe fails to probe correctly due to overflow if stack is greater than 4GB"
href="https://bugs.llvm.org/show_bug.cgi?id=44129">44129</a>
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<th>Summary</th>
<td>stack-probe fails to probe correctly due to overflow if stack is greater than 4GB
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>9.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</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>
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<th>Component</th>
<td>Backend: X86
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>simonas+llvm.org@kazlauskas.me
</td>
</tr>
<tr>
<th>CC</th>
<td>craig.topper@gmail.com, llvm-bugs@lists.llvm.org, llvm-dev@redking.me.uk, spatel+llvm@rotateright.com
</td>
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<p>
<div>
<pre>Given this example
```
target triple = "x86_64-unknown-linux-gnu"
define void @foo() unnamed_addr #0 {
start:
%b = alloca i64, align 8
%c = alloca [4294967295 x i8], align 1
ret void
}
attributes #0 = { nonlazybind uwtable "probe-stack"="probe_stack"
"target-cpu"="x86-64" }
```
which when compiled with `llc -filetype=asm test.ll -o -` will output:
```
foo:
movl $8, %eax
callq probe_stack
...
```
Note that the probe size has overflowed and we are now probing just for 8
bytes.</pre>
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</p>
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