java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/SifaC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-multidimensional/copy-partial-3-u.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-a32b1f7 [2019-08-17 21:14:26,049 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-08-17 21:14:26,051 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-08-17 21:14:26,067 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-08-17 21:14:26,067 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-08-17 21:14:26,068 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-08-17 21:14:26,071 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-08-17 21:14:26,074 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-08-17 21:14:26,076 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-08-17 21:14:26,077 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-08-17 21:14:26,078 INFO L181 SettingsManager]: Resetting Symbolic Interpretation preferences to default values [2019-08-17 21:14:26,079 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-08-17 21:14:26,079 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-08-17 21:14:26,080 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-08-17 21:14:26,081 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-08-17 21:14:26,082 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-08-17 21:14:26,082 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-08-17 21:14:26,083 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-08-17 21:14:26,085 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-08-17 21:14:26,087 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-08-17 21:14:26,089 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-08-17 21:14:26,093 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-08-17 21:14:26,094 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-08-17 21:14:26,094 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-08-17 21:14:26,097 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-08-17 21:14:26,102 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-08-17 21:14:26,103 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-08-17 21:14:26,105 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-08-17 21:14:26,106 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-08-17 21:14:26,108 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-08-17 21:14:26,108 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-08-17 21:14:26,109 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-08-17 21:14:26,109 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-08-17 21:14:26,109 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-08-17 21:14:26,112 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-08-17 21:14:26,113 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-08-17 21:14:26,115 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-08-17 21:14:26,136 INFO L113 SettingsManager]: Loading preferences was successful [2019-08-17 21:14:26,137 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-08-17 21:14:26,139 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-08-17 21:14:26,139 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-08-17 21:14:26,139 INFO L138 SettingsManager]: * Use SBE=true [2019-08-17 21:14:26,140 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-08-17 21:14:26,140 INFO L138 SettingsManager]: * sizeof long=4 [2019-08-17 21:14:26,140 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-08-17 21:14:26,141 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-08-17 21:14:26,141 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-08-17 21:14:26,142 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-08-17 21:14:26,142 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-08-17 21:14:26,142 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-08-17 21:14:26,143 INFO L138 SettingsManager]: * sizeof long double=12 [2019-08-17 21:14:26,143 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-08-17 21:14:26,143 INFO L138 SettingsManager]: * Use constant arrays=true [2019-08-17 21:14:26,143 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-08-17 21:14:26,144 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-08-17 21:14:26,144 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-08-17 21:14:26,145 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-08-17 21:14:26,145 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-08-17 21:14:26,145 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-08-17 21:14:26,145 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-08-17 21:14:26,145 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-08-17 21:14:26,146 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-08-17 21:14:26,146 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-08-17 21:14:26,146 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-08-17 21:14:26,146 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-08-17 21:14:26,146 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-08-17 21:14:26,191 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-08-17 21:14:26,202 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-08-17 21:14:26,206 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-08-17 21:14:26,207 INFO L271 PluginConnector]: Initializing CDTParser... [2019-08-17 21:14:26,208 INFO L275 PluginConnector]: CDTParser initialized [2019-08-17 21:14:26,208 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-multidimensional/copy-partial-3-u.c [2019-08-17 21:14:26,273 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/829bb1162/4c13db4f3f254547a4ee00327fb4a27e/FLAG8d73e4bed [2019-08-17 21:14:26,688 INFO L306 CDTParser]: Found 1 translation units. [2019-08-17 21:14:26,689 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-multidimensional/copy-partial-3-u.c [2019-08-17 21:14:26,700 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/829bb1162/4c13db4f3f254547a4ee00327fb4a27e/FLAG8d73e4bed [2019-08-17 21:14:27,047 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/829bb1162/4c13db4f3f254547a4ee00327fb4a27e [2019-08-17 21:14:27,057 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-08-17 21:14:27,061 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-08-17 21:14:27,062 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-08-17 21:14:27,062 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-08-17 21:14:27,068 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-08-17 21:14:27,069 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.08 09:14:27" (1/1) ... [2019-08-17 21:14:27,071 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2fbeac31 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.08 09:14:27, skipping insertion in model container [2019-08-17 21:14:27,072 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.08 09:14:27" (1/1) ... [2019-08-17 21:14:27,079 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-08-17 21:14:27,108 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-08-17 21:14:27,363 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-08-17 21:14:27,367 INFO L188 MainTranslator]: Completed pre-run [2019-08-17 21:14:27,499 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-08-17 21:14:27,518 INFO L192 MainTranslator]: Completed translation [2019-08-17 21:14:27,518 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.08 09:14:27 WrapperNode [2019-08-17 21:14:27,518 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-08-17 21:14:27,519 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-08-17 21:14:27,519 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-08-17 21:14:27,519 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-08-17 21:14:27,529 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.08 09:14:27" (1/1) ... [2019-08-17 21:14:27,530 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.08 09:14:27" (1/1) ... [2019-08-17 21:14:27,538 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.08 09:14:27" (1/1) ... [2019-08-17 21:14:27,538 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.08 09:14:27" (1/1) ... [2019-08-17 21:14:27,547 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.08 09:14:27" (1/1) ... [2019-08-17 21:14:27,556 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.08 09:14:27" (1/1) ... [2019-08-17 21:14:27,558 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.08 09:14:27" (1/1) ... [2019-08-17 21:14:27,560 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-08-17 21:14:27,561 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-08-17 21:14:27,561 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-08-17 21:14:27,561 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-08-17 21:14:27,562 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.08 09:14:27" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-08-17 21:14:27,610 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-08-17 21:14:27,611 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-08-17 21:14:27,611 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-08-17 21:14:27,611 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-08-17 21:14:27,611 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-08-17 21:14:27,611 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-08-17 21:14:27,612 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-08-17 21:14:27,612 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-08-17 21:14:27,612 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-08-17 21:14:27,612 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-08-17 21:14:27,612 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-08-17 21:14:27,612 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-08-17 21:14:27,613 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-08-17 21:14:27,613 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-08-17 21:14:27,613 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-08-17 21:14:27,951 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-08-17 21:14:27,952 INFO L283 CfgBuilder]: Removed 12 assume(true) statements. [2019-08-17 21:14:27,953 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.08 09:14:27 BoogieIcfgContainer [2019-08-17 21:14:27,954 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-08-17 21:14:27,954 INFO L113 PluginConnector]: ------------------------Symbolic Interpretation---------------------------- [2019-08-17 21:14:27,954 INFO L271 PluginConnector]: Initializing Symbolic Interpretation... [2019-08-17 21:14:27,955 INFO L275 PluginConnector]: Symbolic Interpretation initialized [2019-08-17 21:14:27,956 INFO L185 PluginConnector]: Executing the observer SymbolicInterpretationObserver from plugin Symbolic Interpretation for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.08 09:14:27" (1/1) ... [2019-08-17 21:14:27,967 INFO L148 IcfgInterpreter]: Started Sifa with 1 locations of interest [2019-08-17 21:14:27,969 INFO L155 IcfgInterpreter]: Building call graph [2019-08-17 21:14:27,978 INFO L160 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-08-17 21:14:27,986 INFO L165 IcfgInterpreter]: Starting interpretation [2019-08-17 21:14:27,988 INFO L185 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 [2019-08-17 21:14:28,088 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2019-08-17 21:14:28,089 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-08-17 21:14:28,123 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-08-17 21:14:28,124 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2019-08-17 21:14:28,124 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:13, output treesize:12 [2019-08-17 21:14:28,153 INFO L185 IcfgInterpreter]: Interpreting procedure main with input of size 17 [2019-08-17 21:14:28,249 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 27 [2019-08-17 21:14:28,249 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-08-17 21:14:28,264 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-08-17 21:14:28,266 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-08-17 21:14:28,266 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:45, output treesize:62 [2019-08-17 21:14:28,279 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:28,303 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 27 [2019-08-17 21:14:28,304 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-08-17 21:14:28,349 INFO L567 ElimStorePlain]: treesize reduction 5, result has 90.6 percent of original size [2019-08-17 21:14:28,351 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-08-17 21:14:28,351 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:57, output treesize:69 [2019-08-17 21:14:28,367 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:28,400 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 50 treesize of output 46 [2019-08-17 21:14:28,401 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-08-17 21:14:28,418 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 49 [2019-08-17 21:14:28,418 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2019-08-17 21:14:28,486 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-08-17 21:14:28,488 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 2 xjuncts. [2019-08-17 21:14:28,491 INFO L221 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:104, output treesize:138 [2019-08-17 21:14:28,512 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 27 [2019-08-17 21:14:28,512 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-08-17 21:14:28,525 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-08-17 21:14:28,526 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-08-17 21:14:28,527 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:45, output treesize:62 [2019-08-17 21:14:28,535 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:28,536 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:28,585 INFO L341 Elim1Store]: treesize reduction 105, result has 18.0 percent of original size [2019-08-17 21:14:28,586 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 47 treesize of output 47 [2019-08-17 21:14:28,587 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-08-17 21:14:28,621 INFO L567 ElimStorePlain]: treesize reduction 6, result has 90.3 percent of original size [2019-08-17 21:14:28,622 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-08-17 21:14:28,622 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:66, output treesize:56 [2019-08-17 21:14:28,627 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:28,633 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:28,634 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:28,638 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:28,681 INFO L341 Elim1Store]: treesize reduction 125, result has 17.8 percent of original size [2019-08-17 21:14:28,681 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 72 treesize of output 71 [2019-08-17 21:14:28,683 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-08-17 21:14:28,718 INFO L341 Elim1Store]: treesize reduction 125, result has 17.8 percent of original size [2019-08-17 21:14:28,719 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 64 treesize of output 63 [2019-08-17 21:14:28,721 INFO L496 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2019-08-17 21:14:28,764 INFO L567 ElimStorePlain]: treesize reduction 69, result has 46.5 percent of original size [2019-08-17 21:14:28,765 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-08-17 21:14:28,765 INFO L221 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:137, output treesize:60 [2019-08-17 21:14:28,774 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:28,809 INFO L341 Elim1Store]: treesize reduction 125, result has 17.8 percent of original size [2019-08-17 21:14:28,810 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 55 treesize of output 55 [2019-08-17 21:14:28,811 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-08-17 21:14:28,820 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-08-17 21:14:28,820 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-08-17 21:14:28,821 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:61, output treesize:57 [2019-08-17 21:14:28,830 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:28,834 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:28,837 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:28,878 INFO L341 Elim1Store]: treesize reduction 125, result has 17.8 percent of original size [2019-08-17 21:14:28,879 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 55 treesize of output 55 [2019-08-17 21:14:28,879 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-08-17 21:14:28,913 INFO L567 ElimStorePlain]: treesize reduction 8, result has 89.2 percent of original size [2019-08-17 21:14:28,914 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-08-17 21:14:28,914 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:78, output treesize:66 [2019-08-17 21:14:28,952 INFO L341 Elim1Store]: treesize reduction 125, result has 17.8 percent of original size [2019-08-17 21:14:28,968 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 55 treesize of output 55 [2019-08-17 21:14:28,970 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-08-17 21:14:28,982 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-08-17 21:14:28,982 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-08-17 21:14:28,982 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:61, output treesize:57 [2019-08-17 21:14:28,987 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:28,988 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:28,993 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:28,995 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:28,996 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:29,017 WARN L225 Elim1Store]: Array PQE input equivalent to false [2019-08-17 21:14:29,017 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-08-17 21:14:29,018 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-08-17 21:14:29,019 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-08-17 21:14:29,019 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:87, output treesize:1 [2019-08-17 21:14:29,031 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:29,032 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:29,069 INFO L341 Elim1Store]: treesize reduction 125, result has 17.8 percent of original size [2019-08-17 21:14:29,069 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 55 treesize of output 55 [2019-08-17 21:14:29,070 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-08-17 21:14:29,103 INFO L567 ElimStorePlain]: treesize reduction 8, result has 89.6 percent of original size [2019-08-17 21:14:29,104 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-08-17 21:14:29,104 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:81, output treesize:69 [2019-08-17 21:14:29,136 INFO L341 Elim1Store]: treesize reduction 125, result has 17.8 percent of original size [2019-08-17 21:14:29,137 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 55 treesize of output 55 [2019-08-17 21:14:29,137 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-08-17 21:14:29,146 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-08-17 21:14:29,147 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-08-17 21:14:29,148 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:61, output treesize:57 [2019-08-17 21:14:29,167 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:29,174 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:29,183 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:29,190 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:29,202 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:29,209 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:29,214 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:29,216 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:29,225 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:29,232 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:29,235 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:29,240 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:29,244 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:29,253 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:29,265 INFO L320 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-08-17 21:14:29,273 INFO L185 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 37 [2019-08-17 21:14:29,274 INFO L169 IcfgInterpreter]: Interpretation finished [2019-08-17 21:14:29,275 INFO L177 IcfgInterpreter]: Final predicates for locations of interest are: [2019-08-17 21:14:29,278 INFO L179 IcfgInterpreter]: Location __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION has predicate 828#(and (exists ((v_main_~n~0_BEFORE_CALL_1 Int) (v_main_~k~0_BEFORE_CALL_1 Int) (|v_main_~#A~0.base_BEFORE_CALL_1| Int) (v_main_~j~0_BEFORE_CALL_1 Int) (v_main_~i~0_BEFORE_CALL_1 Int) (|v_main_~#A~0.offset_BEFORE_CALL_1| Int) (|v_main_~#B~0.offset_BEFORE_CALL_1| Int) (|v_main_~#B~0.base_BEFORE_CALL_1| Int)) (or (and (< v_main_~k~0_BEFORE_CALL_1 v_main_~n~0_BEFORE_CALL_1) (= |__VERIFIER_assert_#in~cond| 1) (= (select (select |#memory_int| |v_main_~#A~0.base_BEFORE_CALL_1|) (+ (+ (+ |v_main_~#A~0.offset_BEFORE_CALL_1| (* v_main_~i~0_BEFORE_CALL_1 (* (* 4 v_main_~n~0_BEFORE_CALL_1) v_main_~n~0_BEFORE_CALL_1))) (* v_main_~j~0_BEFORE_CALL_1 (* 4 v_main_~n~0_BEFORE_CALL_1))) (* 4 v_main_~k~0_BEFORE_CALL_1))) (select (select |#memory_int| |v_main_~#B~0.base_BEFORE_CALL_1|) (+ (+ (+ |v_main_~#B~0.offset_BEFORE_CALL_1| (* v_main_~i~0_BEFORE_CALL_1 (* (* 4 v_main_~n~0_BEFORE_CALL_1) v_main_~n~0_BEFORE_CALL_1))) (* v_main_~j~0_BEFORE_CALL_1 (* 4 v_main_~n~0_BEFORE_CALL_1))) (* 4 v_main_~k~0_BEFORE_CALL_1))))) (and (< v_main_~k~0_BEFORE_CALL_1 v_main_~n~0_BEFORE_CALL_1) (= |__VERIFIER_assert_#in~cond| 0) (not (= (select (select |#memory_int| |v_main_~#A~0.base_BEFORE_CALL_1|) (+ (+ (+ |v_main_~#A~0.offset_BEFORE_CALL_1| (* v_main_~i~0_BEFORE_CALL_1 (* (* 4 v_main_~n~0_BEFORE_CALL_1) v_main_~n~0_BEFORE_CALL_1))) (* v_main_~j~0_BEFORE_CALL_1 (* 4 v_main_~n~0_BEFORE_CALL_1))) (* 4 v_main_~k~0_BEFORE_CALL_1))) (select (select |#memory_int| |v_main_~#B~0.base_BEFORE_CALL_1|) (+ (+ (+ |v_main_~#B~0.offset_BEFORE_CALL_1| (* v_main_~i~0_BEFORE_CALL_1 (* (* 4 v_main_~n~0_BEFORE_CALL_1) v_main_~n~0_BEFORE_CALL_1))) (* v_main_~j~0_BEFORE_CALL_1 (* 4 v_main_~n~0_BEFORE_CALL_1))) (* 4 v_main_~k~0_BEFORE_CALL_1)))))))) (= 0 __VERIFIER_assert_~cond) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond)) [2019-08-17 21:14:29,299 INFO L92 terpretationObserver]: ✘ Some locations of interest might be reachable, see reported results. [2019-08-17 21:14:29,299 INFO L132 PluginConnector]: ------------------------ END Symbolic Interpretation---------------------------- [2019-08-17 21:14:29,304 INFO L168 Benchmark]: Toolchain (without parser) took 2244.45 ms. Allocated memory was 130.5 MB in the beginning and 217.6 MB in the end (delta: 87.0 MB). Free memory was 85.8 MB in the beginning and 150.7 MB in the end (delta: -65.0 MB). Peak memory consumption was 86.3 MB. Max. memory is 7.1 GB. [2019-08-17 21:14:29,305 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 130.5 MB. Free memory was 104.6 MB in the beginning and 104.4 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2019-08-17 21:14:29,308 INFO L168 Benchmark]: CACSL2BoogieTranslator took 456.88 ms. Allocated memory was 130.5 MB in the beginning and 197.7 MB in the end (delta: 67.1 MB). Free memory was 85.6 MB in the beginning and 173.0 MB in the end (delta: -87.4 MB). Peak memory consumption was 24.3 MB. Max. memory is 7.1 GB. [2019-08-17 21:14:29,309 INFO L168 Benchmark]: Boogie Preprocessor took 41.71 ms. Allocated memory is still 197.7 MB. Free memory was 173.0 MB in the beginning and 171.1 MB in the end (delta: 1.9 MB). Peak memory consumption was 1.9 MB. Max. memory is 7.1 GB. [2019-08-17 21:14:29,311 INFO L168 Benchmark]: RCFGBuilder took 392.71 ms. Allocated memory is still 197.7 MB. Free memory was 171.1 MB in the beginning and 151.6 MB in the end (delta: 19.5 MB). Peak memory consumption was 19.5 MB. Max. memory is 7.1 GB. [2019-08-17 21:14:29,312 INFO L168 Benchmark]: Symbolic Interpretation took 1347.50 ms. Allocated memory was 197.7 MB in the beginning and 217.6 MB in the end (delta: 19.9 MB). Free memory was 151.6 MB in the beginning and 150.7 MB in the end (delta: 869.9 kB). Peak memory consumption was 85.0 MB. Max. memory is 7.1 GB. [2019-08-17 21:14:29,316 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.plugins.symbolicinterpretation: - UnprovableResult [Line: 5]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: Over-approximation of reachable states at this location is 828#(and (exists ((v_main_~n~0_BEFORE_CALL_1 Int) (v_main_~k~0_BEFORE_CALL_1 Int) (|v_main_~#A~0.base_BEFORE_CALL_1| Int) (v_main_~j~0_BEFORE_CALL_1 Int) (v_main_~i~0_BEFORE_CALL_1 Int) (|v_main_~#A~0.offset_BEFORE_CALL_1| Int) (|v_main_~#B~0.offset_BEFORE_CALL_1| Int) (|v_main_~#B~0.base_BEFORE_CALL_1| Int)) (or (and (< v_main_~k~0_BEFORE_CALL_1 v_main_~n~0_BEFORE_CALL_1) (= |__VERIFIER_assert_#in~cond| 1) (= (select (select |#memory_int| |v_main_~#A~0.base_BEFORE_CALL_1|) (+ (+ (+ |v_main_~#A~0.offset_BEFORE_CALL_1| (* v_main_~i~0_BEFORE_CALL_1 (* (* 4 v_main_~n~0_BEFORE_CALL_1) v_main_~n~0_BEFORE_CALL_1))) (* v_main_~j~0_BEFORE_CALL_1 (* 4 v_main_~n~0_BEFORE_CALL_1))) (* 4 v_main_~k~0_BEFORE_CALL_1))) (select (select |#memory_int| |v_main_~#B~0.base_BEFORE_CALL_1|) (+ (+ (+ |v_main_~#B~0.offset_BEFORE_CALL_1| (* v_main_~i~0_BEFORE_CALL_1 (* (* 4 v_main_~n~0_BEFORE_CALL_1) v_main_~n~0_BEFORE_CALL_1))) (* v_main_~j~0_BEFORE_CALL_1 (* 4 v_main_~n~0_BEFORE_CALL_1))) (* 4 v_main_~k~0_BEFORE_CALL_1))))) (and (< v_main_~k~0_BEFORE_CALL_1 v_main_~n~0_BEFORE_CALL_1) (= |__VERIFIER_assert_#in~cond| 0) (not (= (select (select |#memory_int| |v_main_~#A~0.base_BEFORE_CALL_1|) (+ (+ (+ |v_main_~#A~0.offset_BEFORE_CALL_1| (* v_main_~i~0_BEFORE_CALL_1 (* (* 4 v_main_~n~0_BEFORE_CALL_1) v_main_~n~0_BEFORE_CALL_1))) (* v_main_~j~0_BEFORE_CALL_1 (* 4 v_main_~n~0_BEFORE_CALL_1))) (* 4 v_main_~k~0_BEFORE_CALL_1))) (select (select |#memory_int| |v_main_~#B~0.base_BEFORE_CALL_1|) (+ (+ (+ |v_main_~#B~0.offset_BEFORE_CALL_1| (* v_main_~i~0_BEFORE_CALL_1 (* (* 4 v_main_~n~0_BEFORE_CALL_1) v_main_~n~0_BEFORE_CALL_1))) (* v_main_~j~0_BEFORE_CALL_1 (* 4 v_main_~n~0_BEFORE_CALL_1))) (* 4 v_main_~k~0_BEFORE_CALL_1)))))))) (= 0 __VERIFIER_assert_~cond) (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond)). Possible FailurePath: * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 130.5 MB. Free memory was 104.6 MB in the beginning and 104.4 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 456.88 ms. Allocated memory was 130.5 MB in the beginning and 197.7 MB in the end (delta: 67.1 MB). Free memory was 85.6 MB in the beginning and 173.0 MB in the end (delta: -87.4 MB). Peak memory consumption was 24.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 41.71 ms. Allocated memory is still 197.7 MB. Free memory was 173.0 MB in the beginning and 171.1 MB in the end (delta: 1.9 MB). Peak memory consumption was 1.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 392.71 ms. Allocated memory is still 197.7 MB. Free memory was 171.1 MB in the beginning and 151.6 MB in the end (delta: 19.5 MB). Peak memory consumption was 19.5 MB. Max. memory is 7.1 GB. * Symbolic Interpretation took 1347.50 ms. Allocated memory was 197.7 MB in the beginning and 217.6 MB in the end (delta: 19.9 MB). Free memory was 151.6 MB in the beginning and 150.7 MB in the end (delta: 869.9 kB). Peak memory consumption was 85.0 MB. Max. memory is 7.1 GB. RESULT: Ultimate could not prove your program: unable to determine feasibility of some traces Received shutdown request...