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<base href="http://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Use after free in SCEV AA"
href="http://bugs.llvm.org/show_bug.cgi?id=32240">32240</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Use after free in SCEV AA
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Global Analyses
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>keno@alumni.harvard.edu
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Consider the following bugpoint reduced test case:
```
; ModuleID = 'bugpoint-reduced-simplified.bc'
source_filename = "bugpoint-output-e3ce3dd.bc"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
%GalaxySigmaDerivs.2.8.11.14.17.62.68 = type { %SMatrix.0.6.9.12.15.60.66,
%SArray.1.7.10.13.16.61.67 }
%SMatrix.0.6.9.12.15.60.66 = type { [9 x double] }
%SArray.1.7.10.13.16.61.67 = type { [27 x double] }
define void @julia_benchmark2_68791(i8**,
%GalaxySigmaDerivs.2.8.11.14.17.62.68*) #0 {
if22.2.2.2:
%2 = getelementptr i8*, i8** %0, i64 7
%3 = bitcast i8** %2 to i8***
%4 = load i8**, i8*** %3, align 8, !tbaa !1
store i8** %4, i8*** undef, align 8, !tbaa !6
%sig_sf_j.sroa.0.0..sroa_idx = getelementptr inbounds
%GalaxySigmaDerivs.2.8.11.14.17.62.68, %GalaxySigmaDerivs.2.8.11.14.17.62.68*
%1, i64 0, i32 0, i32 0, i64 0
%sig_sf_j.sroa.0.0.copyload = load double, double*
%sig_sf_j.sroa.0.0..sroa_idx, align 1
%5 = fmul double undef, %sig_sf_j.sroa.0.0.copyload
ret void
}
attributes #0 = { "no-frame-pointer-elim"="true" "target-cpu"="knl" }
!llvm.module.flags = !{!0}
!0 = !{i32 1, !"Debug Info Version", i32 3}
!1 = !{!2, !2, i64 0}
!2 = !{!"jtbaa_mutab", !3, i64 0}
!3 = !{!"jtbaa_value", !4, i64 0}
!4 = !{!"jtbaa_data", !5, i64 0}
!5 = !{!"jtbaa"}
!6 = !{!7, !7, i64 0}
!7 = !{!"jtbaa_gcframe", !5, i64 0}
```
Running `opt -scev-aa -da -gvn` on this file crashes opt, because gvn tries to
access a SCEV instance that got freed in
`ScalarEvolutionWrapperPass::releaseMemory`.</pre>
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