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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 - licm crashes with segmentation fault"
href="https://bugs.llvm.org/show_bug.cgi?id=43426">43426</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>licm 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=22558" name="attach_22558" title=".bc file of the source code">attachment 22558</a> <a href="attachment.cgi?id=22558&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 372364)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/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 -early-cse-memssa -licm -jump-threading -instcombine -licm small.bc -o
small-opt.bc
Stack dump:
0. Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt
-early-cse-memssa -licm -jump-threading -instcombine -licm small.bc -o
small-opt.bc
1. Running pass 'Function Pass Manager' on module 'small.bc'.
2. Running pass 'Loop Pass Manager' on function '@d'
3. Running pass 'Loop Invariant Code Motion' on basic block '%for.body'
#0 0x000055c5fd132dca llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x277adca)
#1 0x000055c5fd130aa4 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2778aa4)
#2 0x000055c5fd130be2 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2778be2)
#3 0x00007f3b65799890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
#4 0x000055c5fc442fe9
llvm::MemorySSAUpdater::getPreviousDefRecursive(llvm::BasicBlock*,
llvm::DenseMap<llvm::BasicBlock*, llvm::TrackingVH<llvm::MemoryAccess>,
llvm::DenseMapInfo<llvm::BasicBlock*>,
llvm::detail::DenseMapPair<llvm::BasicBlock*,
llvm::TrackingVH<llvm::MemoryAccess> > >&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1a8afe9)
#5 0x000055c5fc44427e
llvm::MemorySSAUpdater::getPreviousDefFromEnd(llvm::BasicBlock*,
llvm::DenseMap<llvm::BasicBlock*, llvm::TrackingVH<llvm::MemoryAccess>,
llvm::DenseMapInfo<llvm::BasicBlock*>,
llvm::detail::DenseMapPair<llvm::BasicBlock*,
llvm::TrackingVH<llvm::MemoryAccess> > >&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1a8c27e)
...
...
...
#254 0x000055c5fc4430cb
llvm::MemorySSAUpdater::getPreviousDefRecursive(llvm::BasicBlock*,
llvm::DenseMap<llvm::BasicBlock*, llvm::TrackingVH<llvm::MemoryAccess>,
llvm::DenseMapInfo<llvm::BasicBlock*>,
llvm::detail::DenseMapPair<llvm::BasicBlock*,
llvm::TrackingVH<llvm::MemoryAccess> > >&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1a8b0cb)
#255 0x000055c5fc44427e
llvm::MemorySSAUpdater::getPreviousDefFromEnd(llvm::BasicBlock*,
llvm::DenseMap<llvm::BasicBlock*, llvm::TrackingVH<llvm::MemoryAccess>,
llvm::DenseMapInfo<llvm::BasicBlock*>,
llvm::detail::DenseMapPair<llvm::BasicBlock*,
llvm::TrackingVH<llvm::MemoryAccess> > >&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1a8c27e)
Segmentation fault (core dumped)
By using bugpoint, the optimization sequence can be reduced to "-licm"
$opt bugpoint-reduced-simplified.bc -licm
Stack dump:
0. Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt
bugpoint-reduced-simplified.bc -licm
1. Running pass 'Function Pass Manager' on module
'bugpoint-reduced-simplified.bc'.
2. Running pass 'Loop Pass Manager' on function '@d'
3. Running pass 'Loop Invariant Code Motion' on basic block '%for.body'
#0 0x0000563bb2d92dca llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x277adca)
#1 0x0000563bb2d90aa4 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2778aa4)
#2 0x0000563bb2d90be2 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x2778be2)
#3 0x00007f83e0c10890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
#4 0x0000563bb20a41d6
llvm::MemorySSAUpdater::getPreviousDefFromEnd(llvm::BasicBlock*,
llvm::DenseMap<llvm::BasicBlock*, llvm::TrackingVH<llvm::MemoryAccess>,
llvm::DenseMapInfo<llvm::BasicBlock*>,
llvm::detail::DenseMapPair<llvm::BasicBlock*,
llvm::TrackingVH<llvm::MemoryAccess> > >&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1a8c1d6)
...
...
...
#255 0x0000563bb20a30cb
llvm::MemorySSAUpdater::getPreviousDefRecursive(llvm::BasicBlock*,
llvm::DenseMap<llvm::BasicBlock*, llvm::TrackingVH<llvm::MemoryAccess>,
llvm::DenseMapInfo<llvm::BasicBlock*>,
llvm::detail::DenseMapPair<llvm::BasicBlock*,
llvm::TrackingVH<llvm::MemoryAccess> > >&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build10/bin/opt+0x1a8b0cb)
Segmentation fault (core dumped)
----------------------------------------------------------
char a;
int b, c;
char d() {
int e;
for (; 5; e++) {
int f;
{
int g;
long h;
{
int i;
e = 0;
for (; e < 2; e++)
;
for (; 6;)
return 0;
for (; 0;)
for (;;) {
int l;
break;
}
}
if (c) {
int m, n;
for (;;) {
int o, e;
char p, q;
if (a)
break;
++m;
if (b)
continue;
n = f = 0;
}
} else {
for (; 0 == 0;) {
long r;
int s, t, e, j, k;
if (d)
continue;
}
for (; 0;)
return a;
for (;; h--) {
int u;
if (g)
break;
}
}
}
}
return 0;
}</pre>
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