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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - instsimplify crashes with segmentation fault"
href="https://bugs.llvm.org/show_bug.cgi?id=43218">43218</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>instsimplify crashes with segmentation fault
</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>Linux
</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>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>cszide@163.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=22468" name="attach_22468" title=".bc file of the source code">attachment 22468</a> <a href="attachment.cgi?id=22468&action=edit" title=".bc file of the source code">[details]</a></span>
.bc file of the source code
$clang -v
clang version 10.0.0 (trunk 370163)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.4.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$clang -O3 -c -emit-llvm -femit-all-decls -mllvm -disable-llvm-optzns small.c
$opt -load-store-vectorizer -sroa -jump-threading -instsimplify small.bc -o
small-opt.bc
Stack dump:
0. Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt
-load-store-vectorizer -sroa -jump-threading -instsimplify small.bc -o
small-opt.bc
1. Running pass 'Function Pass Manager' on module 'small.bc'.
2. Running pass 'Remove redundant instructions' on function '@a'
#0 0x000055deac2787fa llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x27277fa)
#1 0x000055deac2764d4 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x27254d4)
#2 0x000055deac276612 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x2725612)
#3 0x00007f918413e890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
...
...
...
#253 0x000055deab6a60ac llvm::findScalarElement(llvm::Value*, unsigned int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x1b550ac)
#254 0x000055deab6a60ac llvm::findScalarElement(llvm::Value*, unsigned int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x1b550ac)
#255 0x000055deab6a60ac llvm::findScalarElement(llvm::Value*, unsigned int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x1b550ac)
Segmentation fault (core dumped)
By using bugpoint, the optimization sequences can be further reduced.
$opt bugpoint-reduced-simplified.bc -instsimplify
Stack dump:
0. Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt
bugpoint-reduced-simplified.bc -instsimplify
1. Running pass 'Function Pass Manager' on module
'bugpoint-reduced-simplified.bc'.
2. Running pass 'Remove redundant instructions' on function '@a'
#0 0x0000561c4bc367fa llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x27277fa)
#1 0x0000561c4bc344d4 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x27254d4)
#2 0x0000561c4bc34612 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x2725612)
#3 0x00007fc9921ed890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
#4 0x0000561c4b063f32 llvm::findScalarElement(llvm::Value*, unsigned int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x1b54f32)
...
...
...
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x1b550ac)
#254 0x0000561c4b0640ac llvm::findScalarElement(llvm::Value*, unsigned int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x1b550ac)
#255 0x0000561c4b0640ac llvm::findScalarElement(llvm::Value*, unsigned int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build6/bin/opt+0x1b550ac)
Segmentation fault (core dumped)
----------------------------------------------
void a() {
short ***b, ***c;
short ****d[] = {&c, &c, &b, &c};
for (; 0;)
for (;;) {
short *****e = &d[3];
*e = d[2];
}
}</pre>
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