Witness example2

Example 1

int *a, *b;
int n;
extern int __VERIFIER_nondet_int(void);
void foo()
{
  int i;
  for (i = 0; i < n; i++)
    a[i] = n;
  for (i = 0; i < n - 1; i++)
    b[i] = n;
}
int main()
{
  n = 1;
  while(__VERIFIER_nondet_int() && n < 30) {
    n++;
  }
  a = malloc(n * sizeof(*a));
  b = malloc(n * sizeof(*b));
  *b++ = 0;
  foo();
  if (b[-2])
  { free(a); free(b-1); }
  else
  { free(a); free(b-1); }
  return 0;
}

UAutomizer

<?xml version="1.0" encoding="UTF-8"?>
<graphml xmlns="http://graphml.graphdrawing.org/xmlns" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://graphml.graphdrawing.org/xmlns http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd">
<key id="programfile" attr.name="programfile" for="graph"/>
<key id="programhash" attr.name="programhash" for="graph"/>
<key id="sourcecodelang" attr.name="sourcecodelang" for="graph"/>
<key id="producer" attr.name="producer" for="graph"/>
<key id="specification" attr.name="specification" for="graph"/>
<key id="creationtime" attr.name="creationtime" for="graph"/>
<key id="witness-type" attr.name="witness-type" for="graph"/>
<key id="architecture" attr.name="architecture" for="graph"/>
<key id="entry" attr.name="entry" for="node">
<default>false</default>
</key>
<key id="nodetype" attr.name="nodetype" for="node">
<default>path</default>
</key>
<key id="violation" attr.name="violation" for="node">
<default>false</default>
</key>
<key id="cyclehead" attr.name="cyclehead" for="node">
<default>false</default>
</key>
<key id="invariant" attr.name="invariant" for="node">
<default>true</default>
</key>
<key id="threadId" attr.name="threadId" for="edge"/>
<key id="endline" attr.name="endline" for="edge"/>
<key id="enterLoopHead" attr.name="enterLoopHead" for="edge">
<default>false</default>
</key>
<key id="createThread" attr.name="createThread" for="edge"/>
<key id="enterFunction" attr.name="enterFunction" for="edge"/>
<key id="startline" attr.name="startline" for="edge"/>
<key id="returnFrom" attr.name="returnFrom" for="edge"/>
<key id="assumption" attr.name="assumption" for="edge"/>
<key id="tokens" attr.name="tokens" for="edge"/>
<key id="control" attr.name="control" for="edge"/>
<key id="originfile" attr.name="originfile" for="edge">
<default>/home/center/Project/uautomizer/UAutomizer-linux/960521-1_1-1.i</default>
</key>
<key id="sourcecode" attr.name="sourcecode" for="edge"/>
<graph edgedefault="directed">
<data key="programfile">/home/center/Project/uautomizer/UAutomizer-linux/960521-1_1-1.i</data>
<data key="programhash">978f701fee046cd9a3f43bfb12d114d1876d2f10</data>
<data key="sourcecodelang">C</data>
<data key="producer">Automizer</data>
<data key="specification">CHECK( init(main()), LTL(G valid-free) )
CHECK( init(main()), LTL(G valid-deref) )
CHECK( init(main()), LTL(G valid-memtrack) )

</data>
<data key="creationtime">2021-10-13T10:31:57</data>
<data key="witness-type">violation_witness</data>
<data key="architecture">64bit</data>
<node id="N0">
<data key="entry">true</data>
</node>
<node id="N1"/>
<node id="N2"/>
<node id="N3"/>
<node id="N4"/>
<node id="N5"/>
<node id="N6"/>
<node id="N7"/>
<node id="N8"/>
<node id="N9"/>
<node id="N10"/>
<node id="N11"/>
<node id="N12"/>
<node id="N13"/>
<node id="N14"/>
<node id="N15">
<data key="violation">true</data>
</node>
<edge id="E0" source="N0" target="N1">
<data key="endline">523</data>
<data key="startline">523</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/960521-1_1-1.i</data>
<data key="sourcecode">int *a, *b;</data>
</edge>
<edge id="E1" source="N1" target="N2">
<data key="endline">524</data>
<data key="startline">524</data>
<data key="assumption">n==0;</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/960521-1_1-1.i</data>
<data key="sourcecode">int n;</data>
</edge>
<edge id="E2" source="N2" target="N3">
<data key="endline">536</data>
<data key="startline">536</data>
<data key="assumption">n==1;</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/960521-1_1-1.i</data>
<data key="sourcecode">n = 1</data>
</edge>
<edge id="E3" source="N3" target="N4">
<data key="endline">537</data>
<data key="startline">537</data>
<data key="control">condition-false</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/960521-1_1-1.i</data>
<data key="sourcecode">[!(__VERIFIER_nondet_int() &amp;&amp; n &lt; 30)]</data>
</edge>
<edge id="E4" source="N4" target="N5">
<data key="endline">540</data>
<data key="startline">540</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/960521-1_1-1.i</data>
<data key="sourcecode">a = malloc(n * sizeof(*a))</data>
</edge>
<edge id="E5" source="N5" target="N6">
<data key="endline">541</data>
<data key="startline">541</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/960521-1_1-1.i</data>
<data key="sourcecode">b = malloc(n * sizeof(*b))</data>
</edge>
<edge id="E6" source="N6" target="N7">
<data key="endline">542</data>
<data key="startline">542</data>
<data key="assumption">n==1;</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/960521-1_1-1.i</data>
<data key="sourcecode">b++</data>
</edge>
<edge id="E7" source="N7" target="N8">
<data key="endline">543</data>
<data key="enterFunction">foo</data>
<data key="startline">543</data>
<data key="assumption">n==1;</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/960521-1_1-1.i</data>
<data key="sourcecode">foo()</data>
</edge>
<edge id="E8" source="N8" target="N9">
<data key="endline">528</data>
<data key="startline">528</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/960521-1_1-1.i</data>
<data key="sourcecode">int i;</data>
</edge>
<edge id="E9" source="N9" target="N10">
<data key="endline">529</data>
<data key="startline">529</data>
<data key="assumption">n==1;i==0;</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/960521-1_1-1.i</data>
<data key="sourcecode">i = 0</data>
</edge>
<edge id="E10" source="N10" target="N11">
<data key="endline">530</data>
<data key="startline">530</data>
<data key="assumption">i==0;n==1;</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/960521-1_1-1.i</data>
<data key="sourcecode">a[i] = n</data>
</edge>
<edge id="E11" source="N11" target="N12">
<data key="endline">529</data>
<data key="startline">529</data>
<data key="assumption">i==1;n==1;</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/960521-1_1-1.i</data>
<data key="sourcecode">i++</data>
</edge>
<edge id="E12" source="N12" target="N13">
<data key="endline">531</data>
<data key="startline">531</data>
<data key="assumption">n==1;i==0;</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/960521-1_1-1.i</data>
<data key="sourcecode">i = 0</data>
</edge>
<edge id="E13" source="N13" target="N14">
<data key="endline">543</data>
<data key="startline">543</data>
<data key="returnFrom">foo</data>
<data key="assumption">n==1;</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/960521-1_1-1.i</data>
<data key="sourcecode">foo()</data>
</edge>
<edge id="E14" source="N14" target="N15">
<data key="endline">544</data>
<data key="startline">544</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/960521-1_1-1.i</data>
<data key="sourcecode">b[-2]</data>
</edge>
</graph>
</graphml>

CPAChecker

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<graphml xmlns="http://graphml.graphdrawing.org/xmlns" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 <key attr.name="isViolationNode" attr.type="boolean" for="node" id="violation">
  <default>false</default>
 </key>
 <key attr.name="isEntryNode" attr.type="boolean" for="node" id="entry">
  <default>false</default>
 </key>
 <key attr.name="isSinkNode" attr.type="boolean" for="node" id="sink">
  <default>false</default>
 </key>
 <key attr.name="enterLoopHead" attr.type="boolean" for="edge" id="enterLoopHead">
  <default>false</default>
 </key>
 <key attr.name="violatedProperty" attr.type="string" for="node" id="violatedProperty"/>
 <key attr.name="sourcecodeLanguage" attr.type="string" for="graph" id="sourcecodelang"/>
 <key attr.name="programFile" attr.type="string" for="graph" id="programfile"/>
 <key attr.name="programHash" attr.type="string" for="graph" id="programhash"/>
 <key attr.name="specification" attr.type="string" for="graph" id="specification"/>
 <key attr.name="architecture" attr.type="string" for="graph" id="architecture"/>
 <key attr.name="producer" attr.type="string" for="graph" id="producer"/>
 <key attr.name="creationTime" attr.type="string" for="graph" id="creationtime"/>
 <key attr.name="startline" attr.type="int" for="edge" id="startline"/>
 <key attr.name="endline" attr.type="int" for="edge" id="endline"/>
 <key attr.name="startoffset" attr.type="int" for="edge" id="startoffset"/>
 <key attr.name="endoffset" attr.type="int" for="edge" id="endoffset"/>
 <key attr.name="originFileName" attr.type="string" for="edge" id="originfile">
  <default>../example1.i</default>
 </key>
 <key attr.name="control" attr.type="string" for="edge" id="control"/>
 <key attr.name="assumption" attr.type="string" for="edge" id="assumption"/>
 <key attr.name="assumption.scope" attr.type="string" for="edge" id="assumption.scope"/>
 <key attr.name="enterFunction" attr.type="string" for="edge" id="enterFunction"/>
 <key attr.name="returnFromFunction" attr.type="string" for="edge" id="returnFrom"/>
 <key attr.name="witness-type" attr.type="string" for="graph" id="witness-type"/>
 <key attr.name="inputWitnessHash" attr.type="string" for="graph" id="inputwitnesshash"/>
 <graph edgedefault="directed">
  <data key="witness-type">violation_witness</data>
  <data key="sourcecodelang">C</data>
  <data key="producer">CPAchecker 2.0</data>
  <data key="specification">CHECK( init(main()), LTL(G valid-memtrack) )</data>
  <data key="specification">CHECK( init(main()), LTL(G valid-deref) )</data>
  <data key="specification">CHECK( init(main()), LTL(G valid-free) )</data>
  <data key="programfile">../example1.i</data>
  <data key="programhash">1bdc21b2f61b0d69220994ec3f8dc9d2db928c146bd54c19e0632aa07d01871a</data>
  <data key="architecture">32bit</data>
  <data key="creationtime">2021-10-13T18:39:37+08:00</data>
  <node id="A0">
   <data key="entry">true</data>
  </node>
  <node id="A542"/>
  <edge source="A0" target="A542">
   <data key="startline">534</data>
   <data key="endline">534</data>
   <data key="startoffset">22912</data>
   <data key="endoffset">22922</data>
   <data key="enterFunction">main</data>
  </edge>
  <node id="A544"/>
  <edge source="A542" target="A544">
   <data key="enterLoopHead">true</data>
   <data key="startline">536</data>
   <data key="endline">536</data>
   <data key="startoffset">22927</data>
   <data key="endoffset">22931</data>
   <data key="assumption">n == (1);</data>
   <data key="assumption.scope">main</data>
  </edge>
  <node id="A556"/>
  <edge source="A544" target="A556">
   <data key="startline">537</data>
   <data key="endline">537</data>
   <data key="startoffset">22969</data>
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   <data key="control">condition-true</data>
   <data key="assumption">n == (1);</data>
   <data key="assumption.scope">main</data>
  </edge>
  <node id="sink">
   <data key="sink">true</data>
  </node>
  <edge source="A544" target="sink">
   <data key="startline">537</data>
   <data key="endline">537</data>
   <data key="startoffset">22942</data>
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   <data key="control">condition-false</data>
  </edge>
  <node id="A560"/>
  <edge source="A556" target="A560">
   <data key="enterLoopHead">true</data>
   <data key="startline">538</data>
   <data key="endline">538</data>
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   <data key="endoffset">22985</data>
   <data key="assumption">n == (2);</data>
   <data key="assumption.scope">main</data>
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   <data key="assumption">n == (2);</data>
   <data key="assumption.scope">main</data>
  </edge>
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   <data key="startline">537</data>
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   <data key="control">condition-false</data>
  </edge>
  <node id="A578"/>
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   <data key="enterLoopHead">true</data>
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   <data key="assumption">n == (3);</data>
   <data key="assumption.scope">main</data>
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   <data key="control">condition-true</data>
   <data key="assumption">n == (3);</data>
   <data key="assumption.scope">main</data>
  </edge>
  <edge source="A578" target="sink">
   <data key="startline">537</data>
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   <data key="control">condition-false</data>
  </edge>
  <node id="A596"/>
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   <data key="enterLoopHead">true</data>
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   <data key="assumption">n == (4);</data>
   <data key="assumption.scope">main</data>
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   <data key="assumption">n == (4);</data>
   <data key="assumption.scope">main</data>
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   <data key="startline">537</data>
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   <data key="control">condition-false</data>
  </edge>
  <node id="A614"/>
  <edge source="A610" target="A614">
   <data key="enterLoopHead">true</data>
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   <data key="endline">538</data>
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   <data key="assumption">n == (5);</data>
   <data key="assumption.scope">main</data>
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   <data key="assumption">n == (5);</data>
   <data key="assumption.scope">main</data>
  </edge>
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   <data key="assumption">n == (6);</data>
   <data key="assumption.scope">main</data>
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   <data key="assumption">n == (6);</data>
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   <data key="assumption">n == (7);</data>
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   <data key="assumption">n == (7);</data>
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   <data key="assumption">n == (8);</data>
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   <data key="assumption">n == (9);</data>
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  <node id="A722"/>
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</graphml>

Symbotic

<?xml version='1.0' encoding='UTF-8'?>
<graphml>
    <graph edgedefault="directed">
        <data key="witness-type">violation_witness</data>
        <data key="sourcecodelang">C</data>
        <data key="producer">Symbiotic</data>
        <data key="specification">memsafety</data>
        <data key="programfile">/opt/symbiotic/install/bin/test.c</data>
        <data key="programhash">95d48fd5665754763184cccfa13eeb702dd15d78</data>
        <data key="architecture">64bit</data>
        <node id="0">
            <data key="entry">true</data>
            <data key="violation">true</data>
        </node>
    </graph>
</graphml>

Example 2

int main() {
  int i, j;
  int length = __VERIFIER_nondet_int();
  if (length < 1) length = 1;
  int *arr = __builtin_alloca (length);
  if (!arr) return 0;
  int *a = arr;
	
	for(int k = 0; k < length; k++)
	{
	  arr[k] = __VERIFIER_nondet_int();
	}
	
  while (*a != *(arr + length - 1)) {
    *a += *(arr + length - 1);
    a++;
  }
  return 0;
}

UAutomizer

UNKNOW

<?xml version="1.0" encoding="UTF-8"?>
<graphml xmlns="http://graphml.graphdrawing.org/xmlns" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://graphml.graphdrawing.org/xmlns http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd">
<key id="programfile" attr.name="programfile" for="graph"/>
<key id="programhash" attr.name="programhash" for="graph"/>
<key id="sourcecodelang" attr.name="sourcecodelang" for="graph"/>
<key id="producer" attr.name="producer" for="graph"/>
<key id="specification" attr.name="specification" for="graph"/>
<key id="creationtime" attr.name="creationtime" for="graph"/>
<key id="witness-type" attr.name="witness-type" for="graph"/>
<key id="architecture" attr.name="architecture" for="graph"/>
<key id="entry" attr.name="entry" for="node">
<default>false</default>
</key>
<key id="nodetype" attr.name="nodetype" for="node">
<default>path</default>
</key>
<key id="violation" attr.name="violation" for="node">
<default>false</default>
</key>
<key id="cyclehead" attr.name="cyclehead" for="node">
<default>false</default>
</key>
<key id="invariant" attr.name="invariant" for="node">
<default>true</default>
</key>
<key id="threadId" attr.name="threadId" for="edge"/>
<key id="endline" attr.name="endline" for="edge"/>
<key id="enterLoopHead" attr.name="enterLoopHead" for="edge">
<default>false</default>
</key>
<key id="createThread" attr.name="createThread" for="edge"/>
<key id="enterFunction" attr.name="enterFunction" for="edge"/>
<key id="startline" attr.name="startline" for="edge"/>
<key id="returnFrom" attr.name="returnFrom" for="edge"/>
<key id="assumption" attr.name="assumption" for="edge"/>
<key id="tokens" attr.name="tokens" for="edge"/>
<key id="control" attr.name="control" for="edge"/>
<key id="originfile" attr.name="originfile" for="edge">
<default>/home/center/Project/uautomizer/UAutomizer-linux/add_last_unsafe.i</default>
</key>
<key id="sourcecode" attr.name="sourcecode" for="edge"/>
<graph edgedefault="directed">
<data key="programfile">/home/center/Project/uautomizer/UAutomizer-linux/add_last_unsafe.i</data>
<data key="programhash">6dcea98e309b9ccb2c2dc4a4f9353c6c61175172</data>
<data key="sourcecodelang">C</data>
<data key="producer">Automizer</data>
<data key="specification">CHECK( init(main()), LTL(G valid-free) )
CHECK( init(main()), LTL(G valid-deref) )
CHECK( init(main()), LTL(G valid-memtrack) )

</data>
<data key="creationtime">2021-10-13T10:34:39</data>
<data key="witness-type">violation_witness</data>
<data key="architecture">64bit</data>
<node id="N0">
<data key="entry">true</data>
</node>
<node id="N1"/>
<node id="N2"/>
<node id="N3"/>
<node id="N4"/>
<node id="N5"/>
<node id="N6"/>
<node id="N7"/>
<node id="N8">
<data key="violation">true</data>
</node>
<edge id="E0" source="N0" target="N1">
<data key="endline">513</data>
<data key="startline">513</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/add_last_unsafe.i</data>
<data key="sourcecode">int i, j;</data>
</edge>
<edge id="E1" source="N1" target="N2">
<data key="endline">514</data>
<data key="startline">514</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/add_last_unsafe.i</data>
<data key="sourcecode">int length = __VERIFIER_nondet_int();</data>
</edge>
<edge id="E2" source="N2" target="N3">
<data key="endline">515</data>
<data key="startline">515</data>
<data key="control">condition-true</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/add_last_unsafe.i</data>
<data key="sourcecode">[length &lt; 1]</data>
</edge>
<edge id="E3" source="N3" target="N4">
<data key="endline">516</data>
<data key="startline">516</data>
<data key="assumption">length==1;</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/add_last_unsafe.i</data>
<data key="sourcecode">int *arr = __builtin_alloca (length);</data>
</edge>
<edge id="E4" source="N4" target="N5">
<data key="endline">517</data>
<data key="startline">517</data>
<data key="control">condition-false</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/add_last_unsafe.i</data>
<data key="sourcecode">[!(!arr)]</data>
</edge>
<edge id="E5" source="N5" target="N6">
<data key="endline">518</data>
<data key="startline">518</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/add_last_unsafe.i</data>
<data key="sourcecode">int *a = arr;</data>
</edge>
<edge id="E6" source="N6" target="N7">
<data key="endline">520</data>
<data key="startline">520</data>
<data key="assumption">k==0;length==1;</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/add_last_unsafe.i</data>
<data key="sourcecode">int k = 0;</data>
</edge>
<edge id="E7" source="N7" target="N8">
<data key="endline">522</data>
<data key="startline">522</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/add_last_unsafe.i</data>
<data key="sourcecode">arr[k] = __VERIFIER_nondet_int()</data>
</edge>
</graph>
</graphml>

CPAChecker

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<graphml xmlns="http://graphml.graphdrawing.org/xmlns" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 <key attr.name="isEntryNode" attr.type="boolean" for="node" id="entry">
  <default>false</default>
 </key>
 <key attr.name="enterLoopHead" attr.type="boolean" for="edge" id="enterLoopHead">
  <default>false</default>
 </key>
 <key attr.name="sourcecodeLanguage" attr.type="string" for="graph" id="sourcecodelang"/>
 <key attr.name="programFile" attr.type="string" for="graph" id="programfile"/>
 <key attr.name="programHash" attr.type="string" for="graph" id="programhash"/>
 <key attr.name="specification" attr.type="string" for="graph" id="specification"/>
 <key attr.name="architecture" attr.type="string" for="graph" id="architecture"/>
 <key attr.name="producer" attr.type="string" for="graph" id="producer"/>
 <key attr.name="creationTime" attr.type="string" for="graph" id="creationtime"/>
 <key attr.name="startline" attr.type="int" for="edge" id="startline"/>
 <key attr.name="endline" attr.type="int" for="edge" id="endline"/>
 <key attr.name="startoffset" attr.type="int" for="edge" id="startoffset"/>
 <key attr.name="endoffset" attr.type="int" for="edge" id="endoffset"/>
 <key attr.name="originFileName" attr.type="string" for="edge" id="originfile">
  <default>../example2.i</default>
 </key>
 <key attr.name="control" attr.type="string" for="edge" id="control"/>
 <key attr.name="enterFunction" attr.type="string" for="edge" id="enterFunction"/>
 <key attr.name="returnFromFunction" attr.type="string" for="edge" id="returnFrom"/>
 <key attr.name="witness-type" attr.type="string" for="graph" id="witness-type"/>
 <key attr.name="inputWitnessHash" attr.type="string" for="graph" id="inputwitnesshash"/>
 <graph edgedefault="directed">
  <data key="witness-type">correctness_witness</data>
  <data key="sourcecodelang">C</data>
  <data key="producer">CPAchecker 2.0</data>
  <data key="specification">CHECK( init(main()), LTL(G valid-memtrack) )</data>
  <data key="specification">CHECK( init(main()), LTL(G valid-deref) )</data>
  <data key="specification">CHECK( init(main()), LTL(G valid-free) )</data>
  <data key="programfile">../example2.i</data>
  <data key="programhash">48fd0d3fe19d1deb0a082df55a1274a55060d743a98a6889cf18bd32ae5a67a0</data>
  <data key="architecture">32bit</data>
  <data key="creationtime">2021-10-13T18:48:10+08:00</data>
  <node id="N25">
   <data key="entry">true</data>
  </node>
  <node id="N26"/>
  <edge source="N25" target="N26">
   <data key="startline">512</data>
   <data key="endline">512</data>
   <data key="startoffset">22037</data>
   <data key="endoffset">22047</data>
   <data key="enterFunction">main</data>
  </edge>
  <node id="N32"/>
  <edge source="N26" target="N32">
   <data key="startline">515</data>
   <data key="endline">515</data>
   <data key="startoffset">22108</data>
   <data key="endoffset">22117</data>
   <data key="control">condition-true</data>
  </edge>
  <edge source="N26" target="N32">
   <data key="startline">515</data>
   <data key="endline">515</data>
   <data key="startoffset">22108</data>
   <data key="endoffset">22117</data>
   <data key="control">condition-false</data>
  </edge>
  <node id="N37"/>
  <edge source="N32" target="N37">
   <data key="startline">517</data>
   <data key="endline">517</data>
   <data key="startoffset">22179</data>
   <data key="endoffset">22181</data>
   <data key="control">condition-true</data>
  </edge>
  <node id="N36"/>
  <edge source="N32" target="N36">
   <data key="startline">517</data>
   <data key="endline">517</data>
   <data key="startoffset">22179</data>
   <data key="endoffset">22181</data>
   <data key="control">condition-false</data>
  </edge>
  <node id="N41"/>
  <edge source="N36" target="N41">
   <data key="enterLoopHead">true</data>
   <data key="startline">520</data>
   <data key="endline">520</data>
   <data key="startoffset">22217</data>
   <data key="endoffset">22225</data>
  </edge>
  <node id="N43"/>
  <edge source="N41" target="N43">
   <data key="startline">520</data>
   <data key="endline">520</data>
   <data key="startoffset">22228</data>
   <data key="endoffset">22237</data>
   <data key="control">condition-true</data>
  </edge>
  <node id="N51"/>
  <edge source="N41" target="N51">
   <data key="enterLoopHead">true</data>
   <data key="startline">520</data>
   <data key="endline">520</data>
   <data key="startoffset">22228</data>
   <data key="endoffset">22237</data>
   <data key="control">condition-false</data>
  </edge>
  <node id="N48"/>
  <edge source="N51" target="N48">
   <data key="startline">525</data>
   <data key="endline">525</data>
   <data key="startoffset">22299</data>
   <data key="endoffset">22323</data>
   <data key="control">condition-false</data>
  </edge>
  <node id="N47"/>
  <edge source="N51" target="N47">
   <data key="startline">525</data>
   <data key="endline">525</data>
   <data key="startoffset">22299</data>
   <data key="endoffset">22323</data>
   <data key="control">condition-true</data>
  </edge>
  <edge source="N47" target="N51">
   <data key="enterLoopHead">true</data>
   <data key="startline">527</data>
   <data key="endline">527</data>
   <data key="startoffset">22363</data>
   <data key="endoffset">22365</data>
  </edge>
  <node id="N24"/>
  <edge source="N48" target="N24">
   <data key="startline">529</data>
   <data key="endline">529</data>
   <data key="startoffset">22374</data>
   <data key="endoffset">22381</data>
   <data key="returnFrom">main</data>
  </edge>
  <edge source="N43" target="N41">
   <data key="enterLoopHead">true</data>
   <data key="startline">520</data>
   <data key="endline">520</data>
   <data key="startoffset">22240</data>
   <data key="endoffset">22242</data>
  </edge>
  <edge source="N37" target="N24">
   <data key="startline">517</data>
   <data key="endline">517</data>
   <data key="startoffset">22184</data>
   <data key="endoffset">22191</data>
   <data key="returnFrom">main</data>
  </edge>
 </graph>
</graphml>

Symbotic

<?xml version='1.0' encoding='UTF-8'?>
<graphml>
    <graph edgedefault="directed">
        <data key="witness-type">violation_witness</data>
        <data key="sourcecodelang">C</data>
        <data key="producer">Symbiotic</data>
        <data key="specification">memsafety</data>
        <data key="programfile">/opt/symbiotic/install/bin/test.c</data>
        <data key="programhash">adebf6880a1f65004fc57f38ee54d547b6ed814d</data>
        <data key="architecture">64bit</data>
        <node id="0">
            <data key="entry">true</data>
        </node>
        <node id="1" />
        <edge source="0" target="1">
            <data key="startline">514</data>
            <data key="originfile">/opt/symbiotic/install/bin/test.c</data>
            <data key="assumption">length == 0</data>
            <data key="assumption.scope">main</data>
        </edge>
        <node id="2">
            <data key="violation">true</data>
        </node>
        <edge source="1" target="2" />
    </graph>
</graphml>

Example 3

extern int __VERIFIER_nondet_int(void);

void bubbleSort(int numbers[], int array_size)
{
    int i, j, temp;
     
    for (i = (array_size - 1); i >= 0; i--) {
        for (j = 1; j <= i; j++) {
            if (numbers[j-1] > numbers[j]) {
                temp = numbers[j-1];
                numbers[j-1] = numbers[j];
                numbers[j] = temp;
            }
        }
    }
}

int main() {
  int* numbers;
  int array_size = __VERIFIER_nondet_int();
  bubbleSort(numbers, array_size);
  return 0;
}

UAutomizer

<?xml version="1.0" encoding="UTF-8"?>
<graphml xmlns="http://graphml.graphdrawing.org/xmlns" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://graphml.graphdrawing.org/xmlns http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd">
<key id="programfile" attr.name="programfile" for="graph"/>
<key id="programhash" attr.name="programhash" for="graph"/>
<key id="sourcecodelang" attr.name="sourcecodelang" for="graph"/>
<key id="producer" attr.name="producer" for="graph"/>
<key id="specification" attr.name="specification" for="graph"/>
<key id="creationtime" attr.name="creationtime" for="graph"/>
<key id="witness-type" attr.name="witness-type" for="graph"/>
<key id="architecture" attr.name="architecture" for="graph"/>
<key id="entry" attr.name="entry" for="node">
<default>false</default>
</key>
<key id="nodetype" attr.name="nodetype" for="node">
<default>path</default>
</key>
<key id="violation" attr.name="violation" for="node">
<default>false</default>
</key>
<key id="cyclehead" attr.name="cyclehead" for="node">
<default>false</default>
</key>
<key id="invariant" attr.name="invariant" for="node">
<default>true</default>
</key>
<key id="threadId" attr.name="threadId" for="edge"/>
<key id="endline" attr.name="endline" for="edge"/>
<key id="enterLoopHead" attr.name="enterLoopHead" for="edge">
<default>false</default>
</key>
<key id="createThread" attr.name="createThread" for="edge"/>
<key id="enterFunction" attr.name="enterFunction" for="edge"/>
<key id="startline" attr.name="startline" for="edge"/>
<key id="returnFrom" attr.name="returnFrom" for="edge"/>
<key id="assumption" attr.name="assumption" for="edge"/>
<key id="tokens" attr.name="tokens" for="edge"/>
<key id="control" attr.name="control" for="edge"/>
<key id="originfile" attr.name="originfile" for="edge">
<default>/home/center/Project/uautomizer/UAutomizer-linux/bubblesort_unsafe.c</default>
</key>
<key id="sourcecode" attr.name="sourcecode" for="edge"/>
<graph edgedefault="directed">
<data key="programfile">/home/center/Project/uautomizer/UAutomizer-linux/bubblesort_unsafe.c</data>
<data key="programhash">e06dd3d11d320ef89a2d2c8c527408fda05cf2ff</data>
<data key="sourcecodelang">C</data>
<data key="producer">Automizer</data>
<data key="specification">CHECK( init(main()), LTL(G valid-free) )
CHECK( init(main()), LTL(G valid-deref) )
CHECK( init(main()), LTL(G valid-memtrack) )

</data>
<data key="creationtime">2021-10-13T10:36:35</data>
<data key="witness-type">violation_witness</data>
<data key="architecture">64bit</data>
<node id="N0">
<data key="entry">true</data>
</node>
<node id="N1"/>
<node id="N2"/>
<node id="N3"/>
<node id="N4"/>
<node id="N5"/>
<node id="N6"/>
<node id="N7">
<data key="violation">true</data>
</node>
<edge id="E0" source="N0" target="N1">
<data key="endline">19</data>
<data key="startline">19</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/bubblesort_unsafe.c</data>
<data key="sourcecode">int* numbers;</data>
</edge>
<edge id="E1" source="N1" target="N2">
<data key="endline">20</data>
<data key="startline">20</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/bubblesort_unsafe.c</data>
<data key="sourcecode">int array_size = __VERIFIER_nondet_int();</data>
</edge>
<edge id="E2" source="N2" target="N3">
<data key="endline">21</data>
<data key="enterFunction">bubbleSort</data>
<data key="startline">21</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/bubblesort_unsafe.c</data>
<data key="sourcecode">bubbleSort(numbers, array_size)</data>
</edge>
<edge id="E3" source="N3" target="N4">
<data key="endline">5</data>
<data key="startline">5</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/bubblesort_unsafe.c</data>
<data key="sourcecode">int i, j, temp;</data>
</edge>
<edge id="E4" source="N4" target="N5">
<data key="endline">7</data>
<data key="startline">7</data>
<data key="assumption">array_size==2;i==1;</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/bubblesort_unsafe.c</data>
<data key="sourcecode">i = (array_size - 1)</data>
</edge>
<edge id="E5" source="N5" target="N6">
<data key="endline">8</data>
<data key="startline">8</data>
<data key="assumption">j==1;array_size==2;i==1;</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/bubblesort_unsafe.c</data>
<data key="sourcecode">j = 1</data>
</edge>
<edge id="E6" source="N6" target="N7">
<data key="endline">9</data>
<data key="startline">9</data>
<data key="originfile">/home/center/Project/uautomizer/UAutomizer-linux/bubblesort_unsafe.c</data>
<data key="sourcecode">numbers[j-1]</data>
</edge>
</graph>
</graphml>

CPAChecker

跑不出来

Symbotic

<?xml version='1.0' encoding='UTF-8'?>
<graphml>
    <graph edgedefault="directed">
        <data key="witness-type">violation_witness</data>
        <data key="sourcecodelang">C</data>
        <data key="producer">Symbiotic</data>
        <data key="specification">memsafety</data>
        <data key="programfile">/opt/symbiotic/install/bin/test.c</data>
        <data key="programhash">f81a40769334d079fb40923ba8ed0d6ffd917b44</data>
        <data key="architecture">64bit</data>
        <node id="0">
            <data key="entry">true</data>
        </node>
        <node id="1" />
        <edge source="0" target="1">
            <data key="startline">20</data>
            <data key="originfile">/opt/symbiotic/install/bin/test.c</data>
            <data key="assumption">array_size == 2147483647</data>
            <data key="assumption.scope">main</data>
        </edge>
        <node id="2">
            <data key="violation">true</data>
        </node>
        <edge source="1" target="2" />
    </graph>
</graphml>