/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 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 16:52:31,125 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 16:52:31,129 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 16:52:31,150 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 16:52:31,150 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 16:52:31,153 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 16:52:31,156 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 16:52:31,173 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 16:52:31,176 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 16:52:31,178 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 16:52:31,182 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 16:52:31,184 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 16:52:31,184 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 16:52:31,186 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 16:52:31,190 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 16:52:31,194 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 16:52:31,197 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 16:52:31,198 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 16:52:31,202 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 16:52:31,212 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 16:52:31,217 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 16:52:31,218 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 16:52:31,223 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 16:52:31,224 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 16:52:31,226 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 16:52:31,236 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 16:52:31,237 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 16:52:31,238 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 16:52:31,239 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 [2020-07-20 16:52:31,255 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 16:52:31,256 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 16:52:31,257 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 16:52:31,257 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 16:52:31,258 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 16:52:31,258 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 16:52:31,258 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 16:52:31,258 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 16:52:31,259 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 16:52:31,259 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 16:52:31,259 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 16:52:31,259 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 16:52:31,259 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 16:52:31,260 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 16:52:31,260 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 16:52:31,260 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 16:52:31,260 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 16:52:31,260 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 16:52:31,261 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 16:52:31,261 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 16:52:31,261 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 16:52:31,261 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:52:31,262 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 16:52:31,262 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 16:52:31,262 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 16:52:31,262 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 16:52:31,262 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:31,263 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 16:52:31,263 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 16:52:31,263 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 -> 4 [2020-07-20 16:52:31,645 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 16:52:31,661 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 16:52:31,666 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 16:52:31,668 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 16:52:31,669 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 16:52:31,670 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_4-2.c [2020-07-20 16:52:31,780 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dbbfe5f7e/28d484d1a5e74b67a479c904bf21319a/FLAG29545ffa1 [2020-07-20 16:52:32,337 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 16:52:32,338 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_4-2.c [2020-07-20 16:52:32,349 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dbbfe5f7e/28d484d1a5e74b67a479c904bf21319a/FLAG29545ffa1 [2020-07-20 16:52:32,783 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dbbfe5f7e/28d484d1a5e74b67a479c904bf21319a [2020-07-20 16:52:32,796 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 16:52:32,800 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 16:52:32,802 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 16:52:32,802 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 16:52:32,807 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 16:52:32,808 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:52:32" (1/1) ... [2020-07-20 16:52:32,812 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2336622c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:52:32, skipping insertion in model container [2020-07-20 16:52:32,812 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:52:32" (1/1) ... [2020-07-20 16:52:32,822 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 16:52:32,841 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 16:52:33,050 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:52:33,057 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 16:52:33,078 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:52:33,097 INFO L208 MainTranslator]: Completed translation [2020-07-20 16:52:33,098 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:52:33 WrapperNode [2020-07-20 16:52:33,098 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 16:52:33,099 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 16:52:33,099 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 16:52:33,100 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 16:52:33,118 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:52:33" (1/1) ... [2020-07-20 16:52:33,118 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:52:33" (1/1) ... [2020-07-20 16:52:33,127 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:52:33" (1/1) ... [2020-07-20 16:52:33,127 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:52:33" (1/1) ... [2020-07-20 16:52:33,229 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:52:33" (1/1) ... [2020-07-20 16:52:33,233 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:52:33" (1/1) ... [2020-07-20 16:52:33,239 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:52:33" (1/1) ... [2020-07-20 16:52:33,241 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 16:52:33,242 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 16:52:33,242 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 16:52:33,242 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 16:52:33,243 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:52:33" (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 [2020-07-20 16:52:33,327 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 16:52:33,327 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 16:52:33,327 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-20 16:52:33,328 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-20 16:52:33,328 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 16:52:33,328 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 16:52:33,328 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 16:52:33,328 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-20 16:52:33,328 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-20 16:52:33,329 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 16:52:33,329 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 16:52:33,329 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 16:52:33,572 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 16:52:33,573 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 16:52:33,578 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:52:33 BoogieIcfgContainer [2020-07-20 16:52:33,578 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 16:52:33,580 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 16:52:33,580 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 16:52:33,584 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 16:52:33,585 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:52:32" (1/3) ... [2020-07-20 16:52:33,586 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@128c0b9d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:52:33, skipping insertion in model container [2020-07-20 16:52:33,587 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:52:33" (2/3) ... [2020-07-20 16:52:33,587 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@128c0b9d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:52:33, skipping insertion in model container [2020-07-20 16:52:33,587 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:52:33" (3/3) ... [2020-07-20 16:52:33,590 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_4-2.c [2020-07-20 16:52:33,602 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 16:52:33,609 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 16:52:33,624 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 16:52:33,654 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 16:52:33,654 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 16:52:33,655 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 16:52:33,655 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 16:52:33,655 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 16:52:33,656 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 16:52:33,656 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 16:52:33,656 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 16:52:33,680 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 16:52:33,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 16:52:33,690 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:33,691 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:33,692 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:33,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:33,701 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-20 16:52:33,712 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:33,712 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1386810281] [2020-07-20 16:52:33,713 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 16:52:33,798 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:52:33,799 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:33,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:52:33,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:33,932 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:52:33,932 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:52:33,934 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1386810281] [2020-07-20 16:52:33,936 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:52:33,936 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:52:33,943 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [783003074] [2020-07-20 16:52:33,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:52:33,959 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:33,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:52:33,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:52:34,003 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-20 16:52:34,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:34,157 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-20 16:52:34,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:52:34,160 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 16:52:34,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:34,175 INFO L225 Difference]: With dead ends: 44 [2020-07-20 16:52:34,175 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 16:52:34,180 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 16:52:34,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 16:52:34,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 16:52:34,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 16:52:34,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 16:52:34,246 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-20 16:52:34,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:34,247 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 16:52:34,247 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:52:34,248 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 16:52:34,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 16:52:34,250 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:34,251 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:34,466 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:34,467 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:34,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:34,468 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-20 16:52:34,468 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:34,469 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [6217361] [2020-07-20 16:52:34,469 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 16:52:34,504 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:52:34,504 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:34,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 16:52:34,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:34,570 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:52:34,571 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:52:34,572 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [6217361] [2020-07-20 16:52:34,572 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:52:34,572 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 16:52:34,573 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1098612662] [2020-07-20 16:52:34,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 16:52:34,576 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:34,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 16:52:34,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 16:52:34,579 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-20 16:52:34,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:34,716 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 16:52:34,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 16:52:34,718 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 16:52:34,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:34,721 INFO L225 Difference]: With dead ends: 36 [2020-07-20 16:52:34,721 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 16:52:34,724 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 16:52:34,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 16:52:34,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 16:52:34,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 16:52:34,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 16:52:34,758 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-20 16:52:34,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:34,759 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 16:52:34,759 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 16:52:34,759 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 16:52:34,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 16:52:34,763 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:34,765 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:34,966 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:34,967 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:34,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:34,967 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-20 16:52:34,968 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:34,968 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1435887146] [2020-07-20 16:52:34,969 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 16:52:35,022 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:52:35,023 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:35,025 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:52:35,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:35,102 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:52:35,102 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:35,317 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:35,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:35,396 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:52:35,397 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1435887146] [2020-07-20 16:52:35,397 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:35,397 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 16:52:35,398 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [543063902] [2020-07-20 16:52:35,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:52:35,402 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:35,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:52:35,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:52:35,403 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-20 16:52:35,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:35,605 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-20 16:52:35,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:52:35,608 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 16:52:35,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:35,611 INFO L225 Difference]: With dead ends: 41 [2020-07-20 16:52:35,613 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 16:52:35,614 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:52:35,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 16:52:35,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-20 16:52:35,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 16:52:35,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 16:52:35,644 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-20 16:52:35,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:35,648 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 16:52:35,648 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:52:35,648 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 16:52:35,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 16:52:35,653 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:35,654 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, 1, 1, 1, 1, 1] [2020-07-20 16:52:35,854 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:35,855 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:35,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:35,856 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-20 16:52:35,856 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:35,857 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [456422500] [2020-07-20 16:52:35,857 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 [2020-07-20 16:52:35,901 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:52:35,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:35,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:52:35,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:35,955 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:52:35,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:36,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:36,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:36,185 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:52:36,186 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [456422500] [2020-07-20 16:52:36,186 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:36,186 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 16:52:36,187 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197140907] [2020-07-20 16:52:36,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 16:52:36,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:36,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 16:52:36,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:52:36,189 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-20 16:52:36,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:36,343 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-20 16:52:36,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:52:36,344 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 16:52:36,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:36,347 INFO L225 Difference]: With dead ends: 46 [2020-07-20 16:52:36,347 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 16:52:36,348 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:52:36,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 16:52:36,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-20 16:52:36,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 16:52:36,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 16:52:36,358 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-20 16:52:36,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:36,359 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 16:52:36,359 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 16:52:36,359 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 16:52:36,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 16:52:36,361 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:36,362 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:36,566 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:36,567 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:36,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:36,567 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-20 16:52:36,568 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:36,568 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [940974266] [2020-07-20 16:52:36,569 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:36,604 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:52:36,604 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:36,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:52:36,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:36,662 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:52:36,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:36,971 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:37,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:37,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:37,096 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 16:52:37,096 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [940974266] [2020-07-20 16:52:37,097 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:37,097 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 16:52:37,097 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472599708] [2020-07-20 16:52:37,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:52:37,099 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:37,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:52:37,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:52:37,101 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-20 16:52:37,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:37,303 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-20 16:52:37,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:52:37,304 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-20 16:52:37,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:37,306 INFO L225 Difference]: With dead ends: 51 [2020-07-20 16:52:37,306 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 16:52:37,307 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 16:52:37,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 16:52:37,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-20 16:52:37,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 16:52:37,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 16:52:37,317 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-20 16:52:37,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:37,318 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 16:52:37,318 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:52:37,318 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 16:52:37,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 16:52:37,320 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:37,320 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:37,527 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:37,528 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:37,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:37,529 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-20 16:52:37,529 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:37,530 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [892908107] [2020-07-20 16:52:37,531 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:37,560 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:52:37,560 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:37,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:52:37,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:37,621 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:52:37,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:37,893 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:37,894 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:37,928 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:52:37,929 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [892908107] [2020-07-20 16:52:37,929 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:37,929 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-20 16:52:37,930 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097601800] [2020-07-20 16:52:37,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:52:37,930 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:37,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:52:37,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:52:37,931 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-20 16:52:38,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:38,229 INFO L93 Difference]: Finished difference Result 84 states and 136 transitions. [2020-07-20 16:52:38,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:52:38,230 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-20 16:52:38,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:38,232 INFO L225 Difference]: With dead ends: 84 [2020-07-20 16:52:38,237 INFO L226 Difference]: Without dead ends: 50 [2020-07-20 16:52:38,239 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 64 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:52:38,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-20 16:52:38,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2020-07-20 16:52:38,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-20 16:52:38,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 67 transitions. [2020-07-20 16:52:38,266 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 67 transitions. Word has length 40 [2020-07-20 16:52:38,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:38,267 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 67 transitions. [2020-07-20 16:52:38,267 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:52:38,267 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 67 transitions. [2020-07-20 16:52:38,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 16:52:38,274 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:38,274 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:38,477 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:38,478 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:38,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:38,478 INFO L82 PathProgramCache]: Analyzing trace with hash 208191613, now seen corresponding path program 1 times [2020-07-20 16:52:38,479 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:38,479 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [704344018] [2020-07-20 16:52:38,479 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:38,530 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:52:38,530 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:38,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:52:38,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:38,589 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 16:52:38,590 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:38,829 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:38,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:38,921 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 16:52:38,922 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [704344018] [2020-07-20 16:52:38,922 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:38,922 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-20 16:52:38,923 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1967634314] [2020-07-20 16:52:38,923 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 16:52:38,924 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:38,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 16:52:38,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:52:38,925 INFO L87 Difference]: Start difference. First operand 47 states and 67 transitions. Second operand 11 states. [2020-07-20 16:52:39,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:39,095 INFO L93 Difference]: Finished difference Result 63 states and 99 transitions. [2020-07-20 16:52:39,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:52:39,096 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 16:52:39,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:39,099 INFO L225 Difference]: With dead ends: 63 [2020-07-20 16:52:39,099 INFO L226 Difference]: Without dead ends: 59 [2020-07-20 16:52:39,100 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 68 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-20 16:52:39,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-20 16:52:39,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2020-07-20 16:52:39,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 16:52:39,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 77 transitions. [2020-07-20 16:52:39,114 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 77 transitions. Word has length 41 [2020-07-20 16:52:39,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:39,115 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 77 transitions. [2020-07-20 16:52:39,115 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 16:52:39,115 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 77 transitions. [2020-07-20 16:52:39,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-20 16:52:39,118 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:39,118 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:39,332 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:39,334 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:39,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:39,334 INFO L82 PathProgramCache]: Analyzing trace with hash -1291563674, now seen corresponding path program 1 times [2020-07-20 16:52:39,335 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:39,336 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1290455163] [2020-07-20 16:52:39,336 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:39,384 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:52:39,384 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:39,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 16:52:39,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:39,437 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 16:52:39,438 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:39,584 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:39,627 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:39,670 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 16:52:39,671 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1290455163] [2020-07-20 16:52:39,671 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:39,671 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-20 16:52:39,671 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [437073245] [2020-07-20 16:52:39,672 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 16:52:39,672 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:39,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 16:52:39,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-07-20 16:52:39,673 INFO L87 Difference]: Start difference. First operand 51 states and 77 transitions. Second operand 9 states. [2020-07-20 16:52:39,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:39,789 INFO L93 Difference]: Finished difference Result 65 states and 105 transitions. [2020-07-20 16:52:39,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:52:39,789 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 53 [2020-07-20 16:52:39,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:39,791 INFO L225 Difference]: With dead ends: 65 [2020-07-20 16:52:39,792 INFO L226 Difference]: Without dead ends: 61 [2020-07-20 16:52:39,792 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 95 SyntacticMatches, 5 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:52:39,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-20 16:52:39,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2020-07-20 16:52:39,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-20 16:52:39,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 82 transitions. [2020-07-20 16:52:39,807 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 82 transitions. Word has length 53 [2020-07-20 16:52:39,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:39,807 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 82 transitions. [2020-07-20 16:52:39,808 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 16:52:39,808 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 82 transitions. [2020-07-20 16:52:39,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-20 16:52:39,816 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:39,817 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:40,020 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:40,020 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:40,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:40,021 INFO L82 PathProgramCache]: Analyzing trace with hash 736840020, now seen corresponding path program 2 times [2020-07-20 16:52:40,021 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:40,022 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [997714031] [2020-07-20 16:52:40,022 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:40,074 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:52:40,074 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:40,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:52:40,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:40,165 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 55 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-20 16:52:40,165 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:40,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:40,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:40,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:40,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:40,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:40,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:40,862 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 59 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-07-20 16:52:40,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [997714031] [2020-07-20 16:52:40,863 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:40,863 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 16:52:40,864 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [610428225] [2020-07-20 16:52:40,864 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 16:52:40,865 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:40,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 16:52:40,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 16:52:40,865 INFO L87 Difference]: Start difference. First operand 53 states and 82 transitions. Second operand 13 states. [2020-07-20 16:52:41,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:41,083 INFO L93 Difference]: Finished difference Result 75 states and 134 transitions. [2020-07-20 16:52:41,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 16:52:41,084 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 78 [2020-07-20 16:52:41,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:41,086 INFO L225 Difference]: With dead ends: 75 [2020-07-20 16:52:41,086 INFO L226 Difference]: Without dead ends: 71 [2020-07-20 16:52:41,088 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 137 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:52:41,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-20 16:52:41,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 56. [2020-07-20 16:52:41,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 16:52:41,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 90 transitions. [2020-07-20 16:52:41,105 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 90 transitions. Word has length 78 [2020-07-20 16:52:41,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:41,106 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 90 transitions. [2020-07-20 16:52:41,106 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 16:52:41,106 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 90 transitions. [2020-07-20 16:52:41,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 16:52:41,108 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:41,108 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:41,324 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:41,325 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:41,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:41,325 INFO L82 PathProgramCache]: Analyzing trace with hash 977113353, now seen corresponding path program 1 times [2020-07-20 16:52:41,326 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:41,326 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [672618386] [2020-07-20 16:52:41,327 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:41,372 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:52:41,373 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:41,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:52:41,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:41,451 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 54 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 16:52:41,451 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:41,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:41,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:41,878 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-20 16:52:41,878 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [672618386] [2020-07-20 16:52:41,879 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:41,879 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-20 16:52:41,879 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132359729] [2020-07-20 16:52:41,880 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:52:41,880 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:41,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:52:41,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:52:41,881 INFO L87 Difference]: Start difference. First operand 56 states and 90 transitions. Second operand 12 states. [2020-07-20 16:52:42,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:42,103 INFO L93 Difference]: Finished difference Result 114 states and 219 transitions. [2020-07-20 16:52:42,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:52:42,104 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 67 [2020-07-20 16:52:42,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:42,106 INFO L225 Difference]: With dead ends: 114 [2020-07-20 16:52:42,106 INFO L226 Difference]: Without dead ends: 64 [2020-07-20 16:52:42,108 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 119 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:52:42,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-20 16:52:42,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2020-07-20 16:52:42,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 16:52:42,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 101 transitions. [2020-07-20 16:52:42,120 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 101 transitions. Word has length 67 [2020-07-20 16:52:42,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:42,121 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 101 transitions. [2020-07-20 16:52:42,121 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:52:42,121 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 101 transitions. [2020-07-20 16:52:42,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 16:52:42,123 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:42,123 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:42,336 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:42,337 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:42,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:42,338 INFO L82 PathProgramCache]: Analyzing trace with hash 643857677, now seen corresponding path program 2 times [2020-07-20 16:52:42,338 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:42,338 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [127606398] [2020-07-20 16:52:42,338 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:42,382 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:52:42,383 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:52:42,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:52:42,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:52:42,480 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 23 proven. 31 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-20 16:52:42,481 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:52:42,823 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:43,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:43,066 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:43,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:52:43,171 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 23 proven. 33 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2020-07-20 16:52:43,171 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [127606398] [2020-07-20 16:52:43,172 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:52:43,172 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-20 16:52:43,172 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097956165] [2020-07-20 16:52:43,173 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 16:52:43,173 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:52:43,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 16:52:43,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-20 16:52:43,174 INFO L87 Difference]: Start difference. First operand 61 states and 101 transitions. Second operand 17 states. [2020-07-20 16:52:43,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:52:43,640 INFO L93 Difference]: Finished difference Result 131 states and 252 transitions. [2020-07-20 16:52:43,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:52:43,641 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 67 [2020-07-20 16:52:43,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:52:43,643 INFO L225 Difference]: With dead ends: 131 [2020-07-20 16:52:43,643 INFO L226 Difference]: Without dead ends: 76 [2020-07-20 16:52:43,647 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 113 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-20 16:52:43,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-20 16:52:43,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 68. [2020-07-20 16:52:43,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-07-20 16:52:43,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 106 transitions. [2020-07-20 16:52:43,681 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 106 transitions. Word has length 67 [2020-07-20 16:52:43,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:52:43,682 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 106 transitions. [2020-07-20 16:52:43,682 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 16:52:43,683 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 106 transitions. [2020-07-20 16:52:43,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-20 16:52:43,684 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:52:43,684 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:52:43,888 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:43,889 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:52:43,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:52:43,890 INFO L82 PathProgramCache]: Analyzing trace with hash -1156896337, now seen corresponding path program 3 times [2020-07-20 16:52:43,890 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:52:43,891 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1412046680] [2020-07-20 16:52:43,891 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:43,953 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:52:43,953 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 16:52:43,954 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 16:52:43,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 16:52:43,970 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 16:52:43,993 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 16:52:43,993 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 16:52:44,208 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:52:44,247 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 04:52:44 BoogieIcfgContainer [2020-07-20 16:52:44,248 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 16:52:44,252 INFO L168 Benchmark]: Toolchain (without parser) took 11451.94 ms. Allocated memory was 146.3 MB in the beginning and 294.6 MB in the end (delta: 148.4 MB). Free memory was 104.4 MB in the beginning and 186.3 MB in the end (delta: -81.9 MB). Peak memory consumption was 66.5 MB. Max. memory is 7.1 GB. [2020-07-20 16:52:44,253 INFO L168 Benchmark]: CDTParser took 0.31 ms. Allocated memory is still 146.3 MB. Free memory was 122.5 MB in the beginning and 122.3 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 16:52:44,254 INFO L168 Benchmark]: CACSL2BoogieTranslator took 296.89 ms. Allocated memory is still 146.3 MB. Free memory was 104.0 MB in the beginning and 94.6 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-07-20 16:52:44,255 INFO L168 Benchmark]: Boogie Preprocessor took 142.04 ms. Allocated memory was 146.3 MB in the beginning and 202.4 MB in the end (delta: 56.1 MB). Free memory was 94.6 MB in the beginning and 181.1 MB in the end (delta: -86.5 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. [2020-07-20 16:52:44,256 INFO L168 Benchmark]: RCFGBuilder took 336.91 ms. Allocated memory is still 202.4 MB. Free memory was 181.1 MB in the beginning and 167.5 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 7.1 GB. [2020-07-20 16:52:44,257 INFO L168 Benchmark]: TraceAbstraction took 10667.97 ms. Allocated memory was 202.4 MB in the beginning and 294.6 MB in the end (delta: 92.3 MB). Free memory was 167.5 MB in the beginning and 186.3 MB in the end (delta: -18.8 MB). Peak memory consumption was 73.5 MB. Max. memory is 7.1 GB. [2020-07-20 16:52:44,261 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.31 ms. Allocated memory is still 146.3 MB. Free memory was 122.5 MB in the beginning and 122.3 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 296.89 ms. Allocated memory is still 146.3 MB. Free memory was 104.0 MB in the beginning and 94.6 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 142.04 ms. Allocated memory was 146.3 MB in the beginning and 202.4 MB in the end (delta: 56.1 MB). Free memory was 94.6 MB in the beginning and 181.1 MB in the end (delta: -86.5 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 336.91 ms. Allocated memory is still 202.4 MB. Free memory was 181.1 MB in the beginning and 167.5 MB in the end (delta: 13.6 MB). Peak memory consumption was 13.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 10667.97 ms. Allocated memory was 202.4 MB in the beginning and 294.6 MB in the end (delta: 92.3 MB). Free memory was 167.5 MB in the beginning and 186.3 MB in the end (delta: -18.8 MB). Peak memory consumption was 73.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 4; VAL [x=4] [L37] CALL, EXPR fibo1(x) VAL [\old(n)=4] [L8] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L10] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=4, fibo2(n-1)=2, n=4] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=4, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) VAL [fibo1(x)=3, x=4] [L37] int result = fibo1(x); [L38] COND TRUE result == 3 VAL [result=3, x=4] [L39] __VERIFIER_error() VAL [result=3, x=4] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 10.5s, OverallIterations: 12, TraceHistogramMax: 6, AutomataDifference: 2.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 277 SDtfs, 350 SDslu, 1205 SDs, 0 SdLazy, 1201 SolverSat, 226 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 950 GetRequests, 759 SyntacticMatches, 60 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 162 ImplicationChecksByTransitivity, 1.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=68occurred in iteration=11, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 11 MinimizatonAttempts, 63 StatesRemovedByMinimization, 10 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 4.4s InterpolantComputationTime, 533 NumberOfCodeBlocks, 387 NumberOfCodeBlocksAsserted, 34 NumberOfCheckSat, 883 ConstructedInterpolants, 0 QuantifiedInterpolants, 96581 SizeOfPredicates, 43 NumberOfNonLiveVariables, 852 ConjunctsInSsa, 80 ConjunctsInUnsatCore, 20 InterpolantComputations, 2 PerfectInterpolantSequences, 469/754 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...