/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive/Ackermann02.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 15:45:01,111 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 15:45:01,114 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 15:45:01,134 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 15:45:01,135 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 15:45:01,137 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 15:45:01,139 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 15:45:01,150 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 15:45:01,155 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 15:45:01,158 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 15:45:01,159 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 15:45:01,160 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 15:45:01,161 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 15:45:01,162 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 15:45:01,164 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 15:45:01,166 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 15:45:01,167 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 15:45:01,168 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 15:45:01,169 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 15:45:01,174 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 15:45:01,180 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 15:45:01,185 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 15:45:01,186 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 15:45:01,187 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 15:45:01,189 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-21 15:45:01,189 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-21 15:45:01,190 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-21 15:45:01,192 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-21 15:45:01,193 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-21 15:45:01,194 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-21 15:45:01,194 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-21 15:45:01,195 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-21 15:45:01,196 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-21 15:45:01,197 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-21 15:45:01,198 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-21 15:45:01,198 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-21 15:45:01,199 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-21 15:45:01,199 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-21 15:45:01,199 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 15:45:01,200 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 15:45:01,201 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 15:45:01,202 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 [2020-07-21 15:45:01,234 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 15:45:01,235 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 15:45:01,236 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 15:45:01,236 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 15:45:01,236 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 15:45:01,236 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 15:45:01,237 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 15:45:01,237 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 15:45:01,237 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 15:45:01,237 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 15:45:01,237 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 15:45:01,238 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 15:45:01,238 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 15:45:01,238 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 15:45:01,238 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 15:45:01,238 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 15:45:01,238 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 15:45:01,239 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 15:45:01,239 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 15:45:01,239 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 15:45:01,239 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 15:45:01,239 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 15:45:01,240 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 15:45:01,240 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 15:45:01,240 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 15:45:01,240 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 15:45:01,240 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:01,241 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 15:45:01,241 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 15:45:01,241 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 -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 15:45:01,541 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 15:45:01,557 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 15:45:01,561 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 15:45:01,562 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 15:45:01,562 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 15:45:01,563 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Ackermann02.c [2020-07-21 15:45:01,642 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9e05616fa/ad52b000bec3402bb575e4ce4d3e6498/FLAG230e477d9 [2020-07-21 15:45:02,114 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 15:45:02,114 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Ackermann02.c [2020-07-21 15:45:02,124 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9e05616fa/ad52b000bec3402bb575e4ce4d3e6498/FLAG230e477d9 [2020-07-21 15:45:02,480 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/9e05616fa/ad52b000bec3402bb575e4ce4d3e6498 [2020-07-21 15:45:02,488 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 15:45:02,491 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 15:45:02,492 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 15:45:02,492 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 15:45:02,495 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 15:45:02,496 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 03:45:02" (1/1) ... [2020-07-21 15:45:02,499 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@52590782 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:02, skipping insertion in model container [2020-07-21 15:45:02,499 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 03:45:02" (1/1) ... [2020-07-21 15:45:02,506 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 15:45:02,520 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 15:45:02,673 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 15:45:02,677 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 15:45:02,693 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 15:45:02,705 INFO L208 MainTranslator]: Completed translation [2020-07-21 15:45:02,706 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:02 WrapperNode [2020-07-21 15:45:02,706 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 15:45:02,707 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 15:45:02,707 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 15:45:02,707 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 15:45:02,717 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:02" (1/1) ... [2020-07-21 15:45:02,717 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:02" (1/1) ... [2020-07-21 15:45:02,721 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:02" (1/1) ... [2020-07-21 15:45:02,722 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:02" (1/1) ... [2020-07-21 15:45:02,726 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:02" (1/1) ... [2020-07-21 15:45:02,728 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:02" (1/1) ... [2020-07-21 15:45:02,729 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:02" (1/1) ... [2020-07-21 15:45:02,731 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 15:45:02,732 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 15:45:02,732 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 15:45:02,732 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 15:45:02,733 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:02" (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 [2020-07-21 15:45:02,893 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 15:45:02,893 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 15:45:02,893 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2020-07-21 15:45:02,893 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 15:45:02,894 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 15:45:02,894 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 15:45:02,894 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2020-07-21 15:45:02,894 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 15:45:02,894 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 15:45:02,894 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 15:45:03,074 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 15:45:03,074 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 15:45:03,078 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 03:45:03 BoogieIcfgContainer [2020-07-21 15:45:03,078 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 15:45:03,079 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 15:45:03,079 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 15:45:03,081 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 15:45:03,081 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 03:45:02" (1/3) ... [2020-07-21 15:45:03,082 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3cc505dc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 03:45:03, skipping insertion in model container [2020-07-21 15:45:03,082 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:45:02" (2/3) ... [2020-07-21 15:45:03,082 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3cc505dc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 03:45:03, skipping insertion in model container [2020-07-21 15:45:03,083 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 03:45:03" (3/3) ... [2020-07-21 15:45:03,084 INFO L109 eAbstractionObserver]: Analyzing ICFG Ackermann02.c [2020-07-21 15:45:03,091 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 15:45:03,098 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 15:45:03,109 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 15:45:03,131 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 15:45:03,131 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 15:45:03,131 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 15:45:03,131 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 15:45:03,132 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 15:45:03,132 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 15:45:03,132 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 15:45:03,132 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 15:45:03,148 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-07-21 15:45:03,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-21 15:45:03,155 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:45:03,156 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:45:03,157 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:45:03,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:45:03,163 INFO L82 PathProgramCache]: Analyzing trace with hash -1796234678, now seen corresponding path program 1 times [2020-07-21 15:45:03,172 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:45:03,172 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1482735770] [2020-07-21 15:45:03,173 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:03,251 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:45:03,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:45:03,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 15:45:03,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:45:03,348 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 15:45:03,349 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 15:45:03,351 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1482735770] [2020-07-21 15:45:03,352 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 15:45:03,353 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 15:45:03,354 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [159802687] [2020-07-21 15:45:03,361 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 15:45:03,362 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:45:03,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 15:45:03,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 15:45:03,387 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 5 states. [2020-07-21 15:45:03,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:45:03,553 INFO L93 Difference]: Finished difference Result 42 states and 54 transitions. [2020-07-21 15:45:03,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 15:45:03,556 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-07-21 15:45:03,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:45:03,570 INFO L225 Difference]: With dead ends: 42 [2020-07-21 15:45:03,571 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 15:45:03,574 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 15:45:03,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 15:45:03,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-21 15:45:03,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 15:45:03,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 36 transitions. [2020-07-21 15:45:03,623 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 36 transitions. Word has length 15 [2020-07-21 15:45:03,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:45:03,623 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 36 transitions. [2020-07-21 15:45:03,624 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 15:45:03,624 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 36 transitions. [2020-07-21 15:45:03,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 15:45:03,627 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:45:03,627 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:45:03,841 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:03,841 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:45:03,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:45:03,842 INFO L82 PathProgramCache]: Analyzing trace with hash -895156504, now seen corresponding path program 1 times [2020-07-21 15:45:03,843 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:45:03,844 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [38200401] [2020-07-21 15:45:03,844 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:03,887 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:45:03,887 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:45:03,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 15:45:03,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:45:03,956 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 15:45:03,956 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:45:04,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:04,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:04,158 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 15:45:04,159 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [38200401] [2020-07-21 15:45:04,159 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:45:04,160 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 8 [2020-07-21 15:45:04,160 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930275775] [2020-07-21 15:45:04,162 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 15:45:04,163 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:45:04,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 15:45:04,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-21 15:45:04,164 INFO L87 Difference]: Start difference. First operand 28 states and 36 transitions. Second operand 8 states. [2020-07-21 15:45:04,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:45:04,288 INFO L93 Difference]: Finished difference Result 38 states and 52 transitions. [2020-07-21 15:45:04,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 15:45:04,289 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 22 [2020-07-21 15:45:04,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:45:04,292 INFO L225 Difference]: With dead ends: 38 [2020-07-21 15:45:04,292 INFO L226 Difference]: Without dead ends: 34 [2020-07-21 15:45:04,293 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 32 SyntacticMatches, 5 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2020-07-21 15:45:04,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-21 15:45:04,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-07-21 15:45:04,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-07-21 15:45:04,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 48 transitions. [2020-07-21 15:45:04,306 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 48 transitions. Word has length 22 [2020-07-21 15:45:04,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:45:04,307 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 48 transitions. [2020-07-21 15:45:04,307 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 15:45:04,307 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 48 transitions. [2020-07-21 15:45:04,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 15:45:04,310 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:45:04,310 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:45:04,523 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:04,524 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:45:04,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:45:04,526 INFO L82 PathProgramCache]: Analyzing trace with hash 687949058, now seen corresponding path program 2 times [2020-07-21 15:45:04,526 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:45:04,527 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [132012517] [2020-07-21 15:45:04,527 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:04,598 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:45:04,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:45:04,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 15:45:04,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:45:04,623 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 15:45:04,624 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:45:04,695 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 15:45:04,696 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [132012517] [2020-07-21 15:45:04,696 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:45:04,697 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-07-21 15:45:04,697 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668191721] [2020-07-21 15:45:04,698 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 15:45:04,698 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:45:04,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 15:45:04,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 15:45:04,699 INFO L87 Difference]: Start difference. First operand 34 states and 48 transitions. Second operand 5 states. [2020-07-21 15:45:04,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:45:04,764 INFO L93 Difference]: Finished difference Result 64 states and 116 transitions. [2020-07-21 15:45:04,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 15:45:04,765 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 29 [2020-07-21 15:45:04,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:45:04,767 INFO L225 Difference]: With dead ends: 64 [2020-07-21 15:45:04,768 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 15:45:04,769 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 53 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2020-07-21 15:45:04,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 15:45:04,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-07-21 15:45:04,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-07-21 15:45:04,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 59 transitions. [2020-07-21 15:45:04,783 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 59 transitions. Word has length 29 [2020-07-21 15:45:04,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:45:04,783 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 59 transitions. [2020-07-21 15:45:04,783 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 15:45:04,784 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 59 transitions. [2020-07-21 15:45:04,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-07-21 15:45:04,786 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:45:04,786 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:45:05,000 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:05,001 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:45:05,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:45:05,002 INFO L82 PathProgramCache]: Analyzing trace with hash -1711672813, now seen corresponding path program 1 times [2020-07-21 15:45:05,003 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:45:05,004 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [952096969] [2020-07-21 15:45:05,004 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:05,055 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:45:05,055 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 15:45:05,056 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 15:45:05,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 15:45:05,077 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 15:45:05,100 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 15:45:05,100 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 15:45:05,316 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:05,360 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 03:45:05 BoogieIcfgContainer [2020-07-21 15:45:05,360 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 15:45:05,363 INFO L168 Benchmark]: Toolchain (without parser) took 2872.40 ms. Allocated memory was 144.7 MB in the beginning and 234.9 MB in the end (delta: 90.2 MB). Free memory was 101.3 MB in the beginning and 164.9 MB in the end (delta: -63.6 MB). Peak memory consumption was 26.6 MB. Max. memory is 7.1 GB. [2020-07-21 15:45:05,364 INFO L168 Benchmark]: CDTParser took 0.57 ms. Allocated memory is still 144.7 MB. Free memory was 119.6 MB in the beginning and 119.4 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-07-21 15:45:05,365 INFO L168 Benchmark]: CACSL2BoogieTranslator took 214.18 ms. Allocated memory is still 144.7 MB. Free memory was 100.9 MB in the beginning and 91.4 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-07-21 15:45:05,366 INFO L168 Benchmark]: Boogie Preprocessor took 24.76 ms. Allocated memory is still 144.7 MB. Free memory was 91.4 MB in the beginning and 90.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-21 15:45:05,367 INFO L168 Benchmark]: RCFGBuilder took 346.19 ms. Allocated memory was 144.7 MB in the beginning and 202.4 MB in the end (delta: 57.7 MB). Free memory was 90.0 MB in the beginning and 169.7 MB in the end (delta: -79.7 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. [2020-07-21 15:45:05,368 INFO L168 Benchmark]: TraceAbstraction took 2281.59 ms. Allocated memory was 202.4 MB in the beginning and 234.9 MB in the end (delta: 32.5 MB). Free memory was 169.0 MB in the beginning and 164.9 MB in the end (delta: 4.2 MB). Peak memory consumption was 36.7 MB. Max. memory is 7.1 GB. [2020-07-21 15:45:05,373 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 144.7 MB. Free memory was 119.6 MB in the beginning and 119.4 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 214.18 ms. Allocated memory is still 144.7 MB. Free memory was 100.9 MB in the beginning and 91.4 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 24.76 ms. Allocated memory is still 144.7 MB. Free memory was 91.4 MB in the beginning and 90.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 346.19 ms. Allocated memory was 144.7 MB in the beginning and 202.4 MB in the end (delta: 57.7 MB). Free memory was 90.0 MB in the beginning and 169.7 MB in the end (delta: -79.7 MB). Peak memory consumption was 10.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2281.59 ms. Allocated memory was 202.4 MB in the beginning and 234.9 MB in the end (delta: 32.5 MB). Free memory was 169.0 MB in the beginning and 164.9 MB in the end (delta: 4.2 MB). Peak memory consumption was 36.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 43]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L26] int m = __VERIFIER_nondet_int(); [L27] COND FALSE !(m < 0 || m > 3) [L32] int n = __VERIFIER_nondet_int(); [L33] COND FALSE !(n < 0 || n > 23) VAL [m=2, n=0] [L39] CALL, EXPR ackermann(m,n) VAL [\old(m)=2, \old(n)=0] [L15] COND FALSE !(m==0) VAL [\old(m)=2, \old(n)=0, m=2, n=0] [L18] COND TRUE n==0 VAL [\old(m)=2, \old(n)=0, m=2, n=0] [L19] CALL, EXPR ackermann(m-1,1) VAL [\old(m)=1, \old(n)=1] [L15] COND FALSE !(m==0) VAL [\old(m)=1, \old(n)=1, m=1, n=1] [L18] COND FALSE !(n==0) VAL [\old(m)=1, \old(n)=1, m=1, n=1] [L21] CALL, EXPR ackermann(m,n-1) VAL [\old(m)=1, \old(n)=0] [L15] COND FALSE !(m==0) VAL [\old(m)=1, \old(n)=0, m=1, n=0] [L18] COND TRUE n==0 VAL [\old(m)=1, \old(n)=0, m=1, n=0] [L19] CALL, EXPR ackermann(m-1,1) VAL [\old(m)=0, \old(n)=1] [L15] COND TRUE m==0 [L16] return n+1; VAL [\old(m)=0, \old(n)=1, \result=2, m=0, n=1] [L19] RET, EXPR ackermann(m-1,1) VAL [\old(m)=1, \old(n)=0, ackermann(m-1,1)=2, m=1, n=0] [L19] return ackermann(m-1,1); [L21] RET, EXPR ackermann(m,n-1) VAL [\old(m)=1, \old(n)=1, ackermann(m,n-1)=2, m=1, n=1] [L21] CALL, EXPR ackermann(m-1,ackermann(m,n-1)) VAL [\old(m)=0, \old(n)=2] [L15] COND TRUE m==0 [L16] return n+1; VAL [\old(m)=0, \old(n)=2, \result=3, m=0, n=2] [L21] RET, EXPR ackermann(m-1,ackermann(m,n-1)) VAL [\old(m)=1, \old(n)=1, ackermann(m,n-1)=2, ackermann(m-1,ackermann(m,n-1))=3, m=1, n=1] [L21] return ackermann(m-1,ackermann(m,n-1)); [L19] RET, EXPR ackermann(m-1,1) VAL [\old(m)=2, \old(n)=0, ackermann(m-1,1)=3, m=2, n=0] [L19] return ackermann(m-1,1); [L39] RET, EXPR ackermann(m,n) VAL [ackermann(m,n)=3, m=2, n=0] [L39] int result = ackermann(m,n); [L40] COND FALSE !(m < 2 || result >= 4) VAL [m=2, n=0, result=3] [L43] __VERIFIER_error() VAL [m=2, n=0, result=3] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 27 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.1s, OverallIterations: 4, TraceHistogramMax: 5, AutomataDifference: 0.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 71 SDtfs, 52 SDslu, 142 SDs, 0 SdLazy, 115 SolverSat, 30 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 119 GetRequests, 96 SyntacticMatches, 7 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=38occurred in iteration=3, 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, 3 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 108 NumberOfCodeBlocks, 101 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 112 ConstructedInterpolants, 0 QuantifiedInterpolants, 4942 SizeOfPredicates, 7 NumberOfNonLiveVariables, 186 ConjunctsInSsa, 13 ConjunctsInUnsatCore, 5 InterpolantComputations, 1 PerfectInterpolantSequences, 31/38 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...