/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test06.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 14:08:13,476 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 14:08:13,479 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 14:08:13,518 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 14:08:13,518 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 14:08:13,527 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 14:08:13,529 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 14:08:13,532 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 14:08:13,534 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 14:08:13,537 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 14:08:13,538 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 14:08:13,539 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 14:08:13,539 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 14:08:13,542 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 14:08:13,544 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 14:08:13,545 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 14:08:13,546 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 14:08:13,547 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 14:08:13,548 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 14:08:13,556 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 14:08:13,558 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 14:08:13,559 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 14:08:13,560 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 14:08:13,560 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 14:08:13,572 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 14:08:13,581 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 14:08:13,582 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 14:08:13,582 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 14:08:13,583 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 14:08:13,604 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 14:08:13,604 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 14:08:13,605 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 14:08:13,605 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 14:08:13,605 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 14:08:13,606 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 14:08:13,606 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 14:08:13,606 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 14:08:13,606 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 14:08:13,606 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 14:08:13,607 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 14:08:13,607 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 14:08:13,607 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 14:08:13,607 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 14:08:13,607 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 14:08:13,607 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 14:08:13,608 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 14:08:13,608 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 14:08:13,608 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 14:08:13,608 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 14:08:13,608 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 14:08:13,609 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 14:08:13,609 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 14:08:13,609 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 14:08:13,609 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 14:08:13,609 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 14:08:13,610 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 14:08:13,610 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 14:08:13,610 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 14:08:13,610 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> log-additional-information=true; [2020-08-21 14:08:13,927 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 14:08:13,946 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 14:08:13,950 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 14:08:13,952 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 14:08:13,952 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 14:08:13,953 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test06.c [2020-08-21 14:08:14,021 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2cb960cc9/1d9928a9c6104e6696bdd7664850783b/FLAGb379b8f44 [2020-08-21 14:08:14,429 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 14:08:14,430 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/ldv-regression/test06.c [2020-08-21 14:08:14,436 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2cb960cc9/1d9928a9c6104e6696bdd7664850783b/FLAGb379b8f44 [2020-08-21 14:08:14,804 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/2cb960cc9/1d9928a9c6104e6696bdd7664850783b [2020-08-21 14:08:14,815 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 14:08:14,817 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 14:08:14,818 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 14:08:14,818 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 14:08:14,822 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 14:08:14,823 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 02:08:14" (1/1) ... [2020-08-21 14:08:14,826 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@72dcb5c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:08:14, skipping insertion in model container [2020-08-21 14:08:14,826 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 02:08:14" (1/1) ... [2020-08-21 14:08:14,835 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 14:08:14,853 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 14:08:15,023 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 14:08:15,035 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 14:08:15,053 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 14:08:15,069 INFO L208 MainTranslator]: Completed translation [2020-08-21 14:08:15,070 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:08:15 WrapperNode [2020-08-21 14:08:15,070 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 14:08:15,071 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 14:08:15,071 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 14:08:15,071 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 14:08:15,183 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:08:15" (1/1) ... [2020-08-21 14:08:15,184 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:08:15" (1/1) ... [2020-08-21 14:08:15,196 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:08:15" (1/1) ... [2020-08-21 14:08:15,197 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:08:15" (1/1) ... [2020-08-21 14:08:15,212 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:08:15" (1/1) ... [2020-08-21 14:08:15,215 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:08:15" (1/1) ... [2020-08-21 14:08:15,221 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:08:15" (1/1) ... [2020-08-21 14:08:15,225 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 14:08:15,226 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 14:08:15,226 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 14:08:15,226 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 14:08:15,227 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:08:15" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-08-21 14:08:15,287 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 14:08:15,287 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 14:08:15,287 INFO L138 BoogieDeclarations]: Found implementation of procedure g [2020-08-21 14:08:15,288 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2020-08-21 14:08:15,288 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 14:08:15,288 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 14:08:15,288 INFO L130 BoogieDeclarations]: Found specification of procedure g [2020-08-21 14:08:15,288 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-21 14:08:15,288 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-21 14:08:15,288 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 14:08:15,289 INFO L130 BoogieDeclarations]: Found specification of procedure f [2020-08-21 14:08:15,289 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 14:08:15,289 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 14:08:15,289 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 14:08:15,289 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 14:08:15,289 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 14:08:15,290 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 14:08:15,555 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 14:08:15,555 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 14:08:15,559 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 02:08:15 BoogieIcfgContainer [2020-08-21 14:08:15,559 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 14:08:15,563 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 14:08:15,563 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 14:08:15,568 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 14:08:15,571 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 02:08:14" (1/3) ... [2020-08-21 14:08:15,572 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1871c3b8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 02:08:15, skipping insertion in model container [2020-08-21 14:08:15,572 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:08:15" (2/3) ... [2020-08-21 14:08:15,576 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1871c3b8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 02:08:15, skipping insertion in model container [2020-08-21 14:08:15,576 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 02:08:15" (3/3) ... [2020-08-21 14:08:15,578 INFO L109 eAbstractionObserver]: Analyzing ICFG test06.c [2020-08-21 14:08:15,606 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 14:08:15,619 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 14:08:15,646 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 14:08:15,673 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 14:08:15,674 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 14:08:15,674 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 14:08:15,674 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 14:08:15,674 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 14:08:15,674 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 14:08:15,674 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 14:08:15,675 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 14:08:15,692 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-08-21 14:08:15,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 14:08:15,698 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:08:15,699 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:08:15,699 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:08:15,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:08:15,704 INFO L82 PathProgramCache]: Analyzing trace with hash -1199829752, now seen corresponding path program 1 times [2020-08-21 14:08:15,710 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:08:15,711 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1724976989] [2020-08-21 14:08:15,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:08:15,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:15,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:08:15,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:16,013 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 14:08:16,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:08:16,055 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:08:16,056 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1724976989] [2020-08-21 14:08:16,060 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 14:08:16,060 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-08-21 14:08:16,061 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1248366647] [2020-08-21 14:08:16,069 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 14:08:16,069 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:08:16,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 14:08:16,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-21 14:08:16,088 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 7 states. [2020-08-21 14:08:16,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:08:16,400 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-08-21 14:08:16,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 14:08:16,402 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-21 14:08:16,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:08:16,411 INFO L225 Difference]: With dead ends: 34 [2020-08-21 14:08:16,411 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 14:08:16,417 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2020-08-21 14:08:16,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 14:08:16,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 14:08:16,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 14:08:16,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 19 transitions. [2020-08-21 14:08:16,449 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 19 transitions. Word has length 14 [2020-08-21 14:08:16,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:08:16,449 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 19 transitions. [2020-08-21 14:08:16,450 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 14:08:16,450 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 19 transitions. [2020-08-21 14:08:16,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 14:08:16,451 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:08:16,451 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:08:16,451 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 14:08:16,452 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:08:16,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:08:16,452 INFO L82 PathProgramCache]: Analyzing trace with hash -2114164890, now seen corresponding path program 1 times [2020-08-21 14:08:16,452 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:08:16,453 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [172401890] [2020-08-21 14:08:16,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:08:16,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 14:08:16,585 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 14:08:16,585 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 14:08:16,590 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 14:08:16,607 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 02:08:16 BoogieIcfgContainer [2020-08-21 14:08:16,607 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 14:08:16,610 INFO L168 Benchmark]: Toolchain (without parser) took 1792.74 ms. Allocated memory was 138.9 MB in the beginning and 203.9 MB in the end (delta: 65.0 MB). Free memory was 102.1 MB in the beginning and 103.6 MB in the end (delta: -1.4 MB). Peak memory consumption was 63.6 MB. Max. memory is 7.1 GB. [2020-08-21 14:08:16,611 INFO L168 Benchmark]: CDTParser took 0.57 ms. Allocated memory is still 138.9 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-08-21 14:08:16,612 INFO L168 Benchmark]: CACSL2BoogieTranslator took 252.52 ms. Allocated memory is still 138.9 MB. Free memory was 101.9 MB in the beginning and 91.6 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-08-21 14:08:16,613 INFO L168 Benchmark]: Boogie Preprocessor took 154.58 ms. Allocated memory was 138.9 MB in the beginning and 203.9 MB in the end (delta: 65.0 MB). Free memory was 91.6 MB in the beginning and 181.9 MB in the end (delta: -90.3 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB. [2020-08-21 14:08:16,614 INFO L168 Benchmark]: RCFGBuilder took 333.71 ms. Allocated memory is still 203.9 MB. Free memory was 181.9 MB in the beginning and 162.4 MB in the end (delta: 19.4 MB). Peak memory consumption was 19.4 MB. Max. memory is 7.1 GB. [2020-08-21 14:08:16,615 INFO L168 Benchmark]: TraceAbstraction took 1044.49 ms. Allocated memory is still 203.9 MB. Free memory was 161.8 MB in the beginning and 103.6 MB in the end (delta: 58.2 MB). Peak memory consumption was 58.2 MB. Max. memory is 7.1 GB. [2020-08-21 14:08:16,619 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.57 ms. Allocated memory is still 138.9 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 252.52 ms. Allocated memory is still 138.9 MB. Free memory was 101.9 MB in the beginning and 91.6 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 154.58 ms. Allocated memory was 138.9 MB in the beginning and 203.9 MB in the end (delta: 65.0 MB). Free memory was 91.6 MB in the beginning and 181.9 MB in the end (delta: -90.3 MB). Peak memory consumption was 12.7 MB. Max. memory is 7.1 GB. * RCFGBuilder took 333.71 ms. Allocated memory is still 203.9 MB. Free memory was 181.9 MB in the beginning and 162.4 MB in the end (delta: 19.4 MB). Peak memory consumption was 19.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 1044.49 ms. Allocated memory is still 203.9 MB. Free memory was 161.8 MB in the beginning and 103.6 MB in the end (delta: 58.2 MB). Peak memory consumption was 58.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 40]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L21] int a, b; [L22] int *p1, *p2; [L24] p1 = &a [L25] p2 = &b [L27] b = 1 [L28] a = 5 [L30] EXPR \read(a) [L30] a-- [L32] EXPR \read(a) [L32] CALL, EXPR f(a, &p1, &p2) [L12] COND TRUE a == 4 [L13] CALL g(p1, p2) [L5] EXPR \read(**p2) [L5] int *pq = *p2; [L7] EXPR \read(**p2) [L7] *p1 = *p2 [L8] *pq = 0 [L13] RET g(p1, p2) [L14] return 1; [L32] RET, EXPR f(a, &p1, &p2) [L32] a = f(a, &p1, &p2) [L34] EXPR \read(*p1) [L34] COND TRUE *p1 == 0 [L40] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.9s, OverallIterations: 2, TraceHistogramMax: 1, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 17 SDtfs, 17 SDslu, 42 SDs, 0 SdLazy, 55 SolverSat, 10 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=24occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 0.1s InterpolantComputationTime, 33 NumberOfCodeBlocks, 33 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 13 ConstructedInterpolants, 0 QuantifiedInterpolants, 533 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 1 InterpolantComputations, 1 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...