/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:01:28,208 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:01:28,211 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:01:28,231 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:01:28,231 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:01:28,233 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:01:28,235 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:01:28,248 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:01:28,250 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:01:28,251 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:01:28,253 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:01:28,254 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:01:28,254 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:01:28,258 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:01:28,260 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:01:28,262 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:01:28,264 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:01:28,266 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:01:28,268 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:01:28,275 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:01:28,279 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:01:28,280 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:01:28,284 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:01:28,284 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:01:28,288 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 16:01:28,299 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:01:28,300 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:01:28,301 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:01:28,302 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 16:01:28,323 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:01:28,324 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:01:28,325 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:01:28,325 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:01:28,326 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:01:28,326 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:01:28,326 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:01:28,326 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:01:28,326 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:01:28,327 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:01:28,327 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:01:28,327 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:01:28,327 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:01:28,327 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:01:28,328 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:01:28,328 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:01:28,328 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:01:28,328 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:01:28,328 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:01:28,329 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:01:28,329 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:01:28,329 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:01:28,329 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:01:28,329 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:01:28,330 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:01:28,330 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:01:28,330 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:28,330 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:01:28,330 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:01:28,330 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 16:01:28,619 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:01:28,633 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:01:28,636 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:01:28,638 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:01:28,638 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:01:28,639 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_5-1.c [2020-07-21 16:01:28,720 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f653c4243/41291aa76aed4e4a9af8ec08e49836dd/FLAG9e9b84af5 [2020-07-21 16:01:29,208 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:01:29,209 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_5-1.c [2020-07-21 16:01:29,216 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f653c4243/41291aa76aed4e4a9af8ec08e49836dd/FLAG9e9b84af5 [2020-07-21 16:01:29,589 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f653c4243/41291aa76aed4e4a9af8ec08e49836dd [2020-07-21 16:01:29,599 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:01:29,603 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:01:29,604 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:01:29,604 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:01:29,608 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:01:29,609 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:01:29" (1/1) ... [2020-07-21 16:01:29,612 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@656f572e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:01:29, skipping insertion in model container [2020-07-21 16:01:29,613 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:01:29" (1/1) ... [2020-07-21 16:01:29,621 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:01:29,644 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:01:29,810 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:01:29,816 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:01:29,834 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:01:29,846 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:01:29,846 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:01:29 WrapperNode [2020-07-21 16:01:29,846 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:01:29,847 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:01:29,847 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:01:29,847 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:01:29,857 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:01:29" (1/1) ... [2020-07-21 16:01:29,858 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:01:29" (1/1) ... [2020-07-21 16:01:29,862 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:01:29" (1/1) ... [2020-07-21 16:01:29,862 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:01:29" (1/1) ... [2020-07-21 16:01:29,865 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:01:29" (1/1) ... [2020-07-21 16:01:29,867 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:01:29" (1/1) ... [2020-07-21 16:01:29,868 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:01:29" (1/1) ... [2020-07-21 16:01:29,869 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:01:29,870 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:01:29,870 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:01:29,870 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:01:29,874 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:01:29" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:01:30,023 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:01:30,023 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:01:30,023 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 16:01:30,023 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:01:30,024 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 16:01:30,024 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:01:30,024 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 16:01:30,024 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:01:30,024 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:01:30,024 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:01:30,195 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:01:30,196 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 16:01:30,200 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:01:30 BoogieIcfgContainer [2020-07-21 16:01:30,200 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:01:30,202 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:01:30,202 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:01:30,205 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:01:30,206 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:01:29" (1/3) ... [2020-07-21 16:01:30,207 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2eb001a2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:01:30, skipping insertion in model container [2020-07-21 16:01:30,207 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:01:29" (2/3) ... [2020-07-21 16:01:30,207 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2eb001a2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:01:30, skipping insertion in model container [2020-07-21 16:01:30,207 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:01:30" (3/3) ... [2020-07-21 16:01:30,209 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_5-1.c [2020-07-21 16:01:30,220 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:01:30,228 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:01:30,243 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:01:30,266 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:01:30,267 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:01:30,267 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:01:30,267 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:01:30,267 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:01:30,268 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:01:30,268 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:01:30,268 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:01:30,287 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 16:01:30,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 16:01:30,294 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:30,295 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:30,296 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:30,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:30,302 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 16:01:30,311 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:30,311 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1972689084] [2020-07-21 16:01:30,312 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:30,373 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:30,374 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:30,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 16:01:30,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:30,488 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:01:30,488 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:01:30,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1972689084] [2020-07-21 16:01:30,490 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:01:30,490 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:01:30,492 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014233844] [2020-07-21 16:01:30,498 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:01:30,499 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:30,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:01:30,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:01:30,520 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 16:01:30,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:30,625 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 16:01:30,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:01:30,629 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 16:01:30,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:30,641 INFO L225 Difference]: With dead ends: 35 [2020-07-21 16:01:30,641 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 16:01:30,645 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 [2020-07-21 16:01:30,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 16:01:30,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 16:01:30,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 16:01:30,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 16:01:30,697 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 16:01:30,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:30,698 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 16:01:30,698 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:01:30,699 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 16:01:30,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 16:01:30,701 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:30,701 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:30,916 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:30,917 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:30,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:30,918 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 16:01:30,919 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:30,920 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1008156330] [2020-07-21 16:01:30,920 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:30,954 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:30,955 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:30,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 16:01:30,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:30,989 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:01:30,990 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:01:30,991 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1008156330] [2020-07-21 16:01:30,991 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:01:30,991 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:01:30,992 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1013385013] [2020-07-21 16:01:30,994 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:01:30,994 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:30,995 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:01:30,995 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:01:30,995 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 16:01:31,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:31,061 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 16:01:31,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:01:31,062 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 16:01:31,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:31,063 INFO L225 Difference]: With dead ends: 27 [2020-07-21 16:01:31,063 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 16:01:31,065 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 [2020-07-21 16:01:31,066 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 16:01:31,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 16:01:31,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 16:01:31,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 16:01:31,074 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 16:01:31,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:31,074 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 16:01:31,075 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:01:31,075 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 16:01:31,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 16:01:31,076 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:31,077 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:31,290 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:31,291 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:31,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:31,292 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 16:01:31,294 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:31,294 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1877867704] [2020-07-21 16:01:31,295 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:31,334 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:31,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:31,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:01:31,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:31,398 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 16:01:31,398 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:31,566 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:31,614 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 16:01:31,614 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1877867704] [2020-07-21 16:01:31,615 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:31,615 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 16:01:31,615 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480879706] [2020-07-21 16:01:31,616 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 16:01:31,616 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:31,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 16:01:31,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 16:01:31,617 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 16:01:31,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:31,750 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 16:01:31,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 16:01:31,751 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 16:01:31,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:31,754 INFO L225 Difference]: With dead ends: 32 [2020-07-21 16:01:31,754 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 16:01:31,756 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 16:01:31,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 16:01:31,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 16:01:31,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 16:01:31,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 16:01:31,768 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 16:01:31,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:31,769 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 16:01:31,769 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 16:01:31,769 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 16:01:31,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 16:01:31,770 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:31,771 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:31,985 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:31,985 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:31,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:31,986 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 16:01:31,986 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:31,986 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1877122609] [2020-07-21 16:01:31,986 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:32,018 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:32,019 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:32,020 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:01:32,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:32,053 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 16:01:32,054 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:32,189 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:32,229 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 16:01:32,230 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1877122609] [2020-07-21 16:01:32,230 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:32,230 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 16:01:32,230 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822966485] [2020-07-21 16:01:32,231 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 16:01:32,231 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:32,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 16:01:32,232 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 16:01:32,232 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 16:01:32,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:32,312 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 16:01:32,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 16:01:32,313 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 16:01:32,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:32,315 INFO L225 Difference]: With dead ends: 37 [2020-07-21 16:01:32,315 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 16:01:32,316 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 16:01:32,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 16:01:32,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 16:01:32,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 16:01:32,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 16:01:32,326 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 16:01:32,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:32,326 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 16:01:32,327 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 16:01:32,327 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 16:01:32,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 16:01:32,329 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:32,329 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:32,542 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:32,543 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:32,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:32,544 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 16:01:32,545 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:32,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [950207469] [2020-07-21 16:01:32,545 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:01:32,593 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:32,593 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:32,594 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:01:32,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:32,636 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 16:01:32,637 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:32,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:32,901 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:32,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:32,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:33,014 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 16:01:33,014 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [950207469] [2020-07-21 16:01:33,015 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:33,015 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 16:01:33,015 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091896831] [2020-07-21 16:01:33,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 16:01:33,016 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:33,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 16:01:33,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 16:01:33,017 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 16:01:33,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:33,169 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 16:01:33,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:01:33,170 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 16:01:33,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:33,172 INFO L225 Difference]: With dead ends: 42 [2020-07-21 16:01:33,172 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 16:01:33,173 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:01:33,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 16:01:33,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 16:01:33,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 16:01:33,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 16:01:33,186 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 16:01:33,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:33,186 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 16:01:33,186 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 16:01:33,186 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 16:01:33,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 16:01:33,188 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:33,189 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:33,400 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:33,401 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:33,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:33,402 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 16:01:33,402 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:33,403 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1481137399] [2020-07-21 16:01:33,403 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:01:33,453 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:33,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:33,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:01:33,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:33,515 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-21 16:01:33,515 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:33,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:33,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:33,784 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:33,822 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 16:01:33,823 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1481137399] [2020-07-21 16:01:33,823 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:33,823 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 16:01:33,825 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428694992] [2020-07-21 16:01:33,825 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 16:01:33,825 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:33,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 16:01:33,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 16:01:33,826 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 16:01:33,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:33,947 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 16:01:33,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:01:33,948 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 16:01:33,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:33,951 INFO L225 Difference]: With dead ends: 47 [2020-07-21 16:01:33,951 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 16:01:33,952 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:01:33,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 16:01:33,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 16:01:33,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 16:01:33,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 16:01:33,963 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 16:01:33,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:33,964 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 16:01:33,964 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 16:01:33,964 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 16:01:33,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 16:01:33,967 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:33,967 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:34,176 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:34,177 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:34,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:34,178 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 16:01:34,178 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:34,179 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1826498785] [2020-07-21 16:01:34,179 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:01:34,222 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:34,223 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:34,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:01:34,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:34,273 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-21 16:01:34,273 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:34,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,784 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,785 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,820 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 16:01:34,821 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1826498785] [2020-07-21 16:01:34,821 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:34,821 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 16:01:34,822 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070161008] [2020-07-21 16:01:34,822 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 16:01:34,823 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:34,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 16:01:34,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 16:01:34,823 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 16:01:34,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:34,989 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 16:01:34,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:01:34,989 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 16:01:34,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:34,993 INFO L225 Difference]: With dead ends: 52 [2020-07-21 16:01:34,993 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 16:01:34,994 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:01:34,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 16:01:35,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 16:01:35,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 16:01:35,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 16:01:35,017 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 16:01:35,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:35,018 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 16:01:35,018 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 16:01:35,020 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 16:01:35,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 16:01:35,023 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:35,023 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:35,228 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:35,229 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:35,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:35,230 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 16:01:35,231 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:35,231 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1929500278] [2020-07-21 16:01:35,232 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:01:35,281 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:35,281 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:35,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:01:35,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:35,438 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 115 proven. 171 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2020-07-21 16:01:35,439 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:36,094 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:36,172 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:36,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:36,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:36,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:36,545 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:36,605 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 115 proven. 193 refuted. 0 times theorem prover too weak. 119 trivial. 0 not checked. [2020-07-21 16:01:36,606 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1929500278] [2020-07-21 16:01:36,607 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:36,607 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 21 [2020-07-21 16:01:36,607 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803093167] [2020-07-21 16:01:36,608 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:01:36,608 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:36,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:01:36,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=344, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:01:36,609 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 21 states. [2020-07-21 16:01:37,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:37,148 INFO L93 Difference]: Finished difference Result 94 states and 184 transitions. [2020-07-21 16:01:37,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-21 16:01:37,148 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 96 [2020-07-21 16:01:37,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:37,150 INFO L225 Difference]: With dead ends: 94 [2020-07-21 16:01:37,151 INFO L226 Difference]: Without dead ends: 64 [2020-07-21 16:01:37,153 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 164 SyntacticMatches, 13 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=351, Invalid=981, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 16:01:37,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-21 16:01:37,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2020-07-21 16:01:37,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 16:01:37,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 77 transitions. [2020-07-21 16:01:37,165 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 77 transitions. Word has length 96 [2020-07-21 16:01:37,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:37,165 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 77 transitions. [2020-07-21 16:01:37,166 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:01:37,166 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 77 transitions. [2020-07-21 16:01:37,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-21 16:01:37,168 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:37,168 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:37,383 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:37,384 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:37,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:37,385 INFO L82 PathProgramCache]: Analyzing trace with hash 2001184551, now seen corresponding path program 4 times [2020-07-21 16:01:37,385 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:37,385 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1946995369] [2020-07-21 16:01:37,386 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:01:37,437 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:37,437 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:37,438 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:01:37,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:37,511 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 17 proven. 88 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 16:01:37,511 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:37,863 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:37,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:37,986 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:38,015 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 17 proven. 103 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2020-07-21 16:01:38,016 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1946995369] [2020-07-21 16:01:38,016 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:38,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 12 [2020-07-21 16:01:38,016 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972370554] [2020-07-21 16:01:38,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:01:38,017 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:38,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:01:38,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:01:38,018 INFO L87 Difference]: Start difference. First operand 61 states and 77 transitions. Second operand 12 states. [2020-07-21 16:01:38,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:38,139 INFO L93 Difference]: Finished difference Result 65 states and 80 transitions. [2020-07-21 16:01:38,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:01:38,140 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 68 [2020-07-21 16:01:38,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:38,142 INFO L225 Difference]: With dead ends: 65 [2020-07-21 16:01:38,143 INFO L226 Difference]: Without dead ends: 61 [2020-07-21 16:01:38,144 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 116 SyntacticMatches, 9 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=85, Invalid=155, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:01:38,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-21 16:01:38,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-07-21 16:01:38,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 16:01:38,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 76 transitions. [2020-07-21 16:01:38,153 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 76 transitions. Word has length 68 [2020-07-21 16:01:38,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:38,153 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 76 transitions. [2020-07-21 16:01:38,154 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:01:38,154 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 76 transitions. [2020-07-21 16:01:38,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 16:01:38,155 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:38,156 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:38,359 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:38,360 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:38,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:38,360 INFO L82 PathProgramCache]: Analyzing trace with hash 1200034344, now seen corresponding path program 5 times [2020-07-21 16:01:38,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:38,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [861210673] [2020-07-21 16:01:38,362 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:01:38,438 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:38,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:38,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 63 conjunts are in the unsatisfiable core [2020-07-21 16:01:38,444 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:38,617 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 185 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2020-07-21 16:01:38,618 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:39,432 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 185 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2020-07-21 16:01:39,432 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [861210673] [2020-07-21 16:01:39,433 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:39,433 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 20 [2020-07-21 16:01:39,433 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [744145700] [2020-07-21 16:01:39,434 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:01:39,434 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:39,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:01:39,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=335, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:01:39,435 INFO L87 Difference]: Start difference. First operand 61 states and 76 transitions. Second operand 20 states. [2020-07-21 16:01:39,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:39,600 INFO L93 Difference]: Finished difference Result 74 states and 93 transitions. [2020-07-21 16:01:39,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 16:01:39,602 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 109 [2020-07-21 16:01:39,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:39,607 INFO L225 Difference]: With dead ends: 74 [2020-07-21 16:01:39,607 INFO L226 Difference]: Without dead ends: 70 [2020-07-21 16:01:39,608 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 195 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=335, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:01:39,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-07-21 16:01:39,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-07-21 16:01:39,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-07-21 16:01:39,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 88 transitions. [2020-07-21 16:01:39,632 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 88 transitions. Word has length 109 [2020-07-21 16:01:39,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:39,633 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 88 transitions. [2020-07-21 16:01:39,633 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:01:39,633 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 88 transitions. [2020-07-21 16:01:39,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2020-07-21 16:01:39,637 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:39,637 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 15, 9, 9, 9, 9, 9, 9, 9, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:39,838 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:39,838 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:39,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:39,839 INFO L82 PathProgramCache]: Analyzing trace with hash -344605238, now seen corresponding path program 6 times [2020-07-21 16:01:39,839 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:39,839 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [138688114] [2020-07-21 16:01:39,839 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:01:39,911 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:39,911 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:39,912 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:01:39,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:40,001 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 536 proven. 137 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2020-07-21 16:01:40,002 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:40,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:41,058 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:41,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:41,191 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:41,246 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 196 proven. 320 refuted. 0 times theorem prover too weak. 417 trivial. 0 not checked. [2020-07-21 16:01:41,247 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [138688114] [2020-07-21 16:01:41,247 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:41,247 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 16:01:41,248 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506716752] [2020-07-21 16:01:41,248 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:01:41,248 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:41,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:01:41,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=213, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:01:41,249 INFO L87 Difference]: Start difference. First operand 69 states and 88 transitions. Second operand 17 states. [2020-07-21 16:01:41,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:41,548 INFO L93 Difference]: Finished difference Result 130 states and 177 transitions. [2020-07-21 16:01:41,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 16:01:41,550 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 136 [2020-07-21 16:01:41,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:41,552 INFO L225 Difference]: With dead ends: 130 [2020-07-21 16:01:41,552 INFO L226 Difference]: Without dead ends: 68 [2020-07-21 16:01:41,553 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 243 SyntacticMatches, 13 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=194, Invalid=456, Unknown=0, NotChecked=0, Total=650 [2020-07-21 16:01:41,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-21 16:01:41,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 65. [2020-07-21 16:01:41,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-21 16:01:41,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 81 transitions. [2020-07-21 16:01:41,564 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 81 transitions. Word has length 136 [2020-07-21 16:01:41,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:41,564 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 81 transitions. [2020-07-21 16:01:41,564 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:01:41,565 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 81 transitions. [2020-07-21 16:01:41,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2020-07-21 16:01:41,566 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:41,567 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 17, 10, 10, 10, 10, 10, 10, 10, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:41,782 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:41,782 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:41,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:41,783 INFO L82 PathProgramCache]: Analyzing trace with hash -1037714201, now seen corresponding path program 7 times [2020-07-21 16:01:41,783 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:41,784 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [761211975] [2020-07-21 16:01:41,784 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:01:41,860 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:41,860 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:41,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:01:41,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:41,965 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 298 proven. 354 refuted. 0 times theorem prover too weak. 504 trivial. 0 not checked. [2020-07-21 16:01:41,965 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:42,583 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:42,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:43,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:43,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:43,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:43,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:43,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:43,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:43,611 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 298 proven. 387 refuted. 0 times theorem prover too weak. 471 trivial. 0 not checked. [2020-07-21 16:01:43,611 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [761211975] [2020-07-21 16:01:43,611 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:43,612 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 16:01:43,612 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [836883339] [2020-07-21 16:01:43,613 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:01:43,613 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:43,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:01:43,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:01:43,614 INFO L87 Difference]: Start difference. First operand 65 states and 81 transitions. Second operand 21 states. [2020-07-21 16:01:44,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:44,079 INFO L93 Difference]: Finished difference Result 129 states and 171 transitions. [2020-07-21 16:01:44,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 16:01:44,084 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 150 [2020-07-21 16:01:44,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:44,086 INFO L225 Difference]: With dead ends: 129 [2020-07-21 16:01:44,086 INFO L226 Difference]: Without dead ends: 72 [2020-07-21 16:01:44,088 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 311 GetRequests, 263 SyntacticMatches, 17 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 198 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=295, Invalid=761, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:01:44,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-21 16:01:44,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 69. [2020-07-21 16:01:44,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-07-21 16:01:44,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 88 transitions. [2020-07-21 16:01:44,105 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 88 transitions. Word has length 150 [2020-07-21 16:01:44,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:44,106 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 88 transitions. [2020-07-21 16:01:44,106 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:01:44,106 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 88 transitions. [2020-07-21 16:01:44,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2020-07-21 16:01:44,113 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:44,114 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 25, 15, 15, 15, 15, 15, 15, 15, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:44,318 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:44,318 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:44,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:44,319 INFO L82 PathProgramCache]: Analyzing trace with hash 706081956, now seen corresponding path program 8 times [2020-07-21 16:01:44,320 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:44,321 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1914807741] [2020-07-21 16:01:44,321 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:44,426 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:44,427 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:44,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 16:01:44,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:44,596 INFO L134 CoverageAnalysis]: Checked inductivity of 2580 backedges. 463 proven. 839 refuted. 0 times theorem prover too weak. 1278 trivial. 0 not checked. [2020-07-21 16:01:44,597 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:45,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:45,931 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:45,931 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:46,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:46,067 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:46,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:46,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:46,850 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:46,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:46,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:47,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:47,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:47,089 INFO L134 CoverageAnalysis]: Checked inductivity of 2580 backedges. 463 proven. 891 refuted. 0 times theorem prover too weak. 1226 trivial. 0 not checked. [2020-07-21 16:01:47,089 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1914807741] [2020-07-21 16:01:47,090 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:47,090 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-21 16:01:47,090 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660070982] [2020-07-21 16:01:47,091 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:01:47,091 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:47,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:01:47,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:01:47,092 INFO L87 Difference]: Start difference. First operand 69 states and 88 transitions. Second operand 25 states. [2020-07-21 16:01:47,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:47,784 INFO L93 Difference]: Finished difference Result 150 states and 214 transitions. [2020-07-21 16:01:47,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-21 16:01:47,785 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 218 [2020-07-21 16:01:47,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:47,787 INFO L225 Difference]: With dead ends: 150 [2020-07-21 16:01:47,787 INFO L226 Difference]: Without dead ends: 89 [2020-07-21 16:01:47,789 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 456 GetRequests, 391 SyntacticMatches, 21 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 422 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=539, Invalid=1531, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 16:01:47,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-07-21 16:01:47,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 75. [2020-07-21 16:01:47,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-07-21 16:01:47,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 96 transitions. [2020-07-21 16:01:47,799 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 96 transitions. Word has length 218 [2020-07-21 16:01:47,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:47,799 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 96 transitions. [2020-07-21 16:01:47,799 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:01:47,800 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 96 transitions. [2020-07-21 16:01:47,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2020-07-21 16:01:47,802 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:47,802 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 20, 12, 12, 12, 12, 12, 12, 12, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:48,015 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:48,016 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:48,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:48,017 INFO L82 PathProgramCache]: Analyzing trace with hash 259499213, now seen corresponding path program 9 times [2020-07-21 16:01:48,018 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:48,018 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [263388328] [2020-07-21 16:01:48,018 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:48,144 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:48,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:48,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:01:48,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:48,228 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 153 proven. 473 refuted. 0 times theorem prover too weak. 1028 trivial. 0 not checked. [2020-07-21 16:01:48,229 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:49,266 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:49,535 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:49,680 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:49,764 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:49,764 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:49,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:49,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:49,873 INFO L134 CoverageAnalysis]: Checked inductivity of 1654 backedges. 153 proven. 513 refuted. 0 times theorem prover too weak. 988 trivial. 0 not checked. [2020-07-21 16:01:49,873 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [263388328] [2020-07-21 16:01:49,874 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:49,874 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 16 [2020-07-21 16:01:49,874 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068227596] [2020-07-21 16:01:49,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:01:49,876 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:49,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:01:49,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=169, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:01:49,877 INFO L87 Difference]: Start difference. First operand 75 states and 96 transitions. Second operand 16 states. [2020-07-21 16:01:50,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:50,019 INFO L93 Difference]: Finished difference Result 75 states and 96 transitions. [2020-07-21 16:01:50,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:01:50,020 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 177 [2020-07-21 16:01:50,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:50,020 INFO L225 Difference]: With dead ends: 75 [2020-07-21 16:01:50,021 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 16:01:50,022 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 326 SyntacticMatches, 13 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=161, Invalid=301, Unknown=0, NotChecked=0, Total=462 [2020-07-21 16:01:50,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 16:01:50,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 16:01:50,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 16:01:50,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 16:01:50,023 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 177 [2020-07-21 16:01:50,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:50,023 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 16:01:50,023 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:01:50,024 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 16:01:50,024 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 16:01:50,224 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:50,228 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 16:01:50,800 WARN L193 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 33 [2020-07-21 16:01:50,907 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 16:01:50,908 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 16:01:50,908 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 16:01:50,908 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 16:01:50,908 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 16:01:50,908 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 16:01:50,908 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 27) no Hoare annotation was computed. [2020-07-21 16:01:50,909 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 23 30) the Hoare annotation is: true [2020-07-21 16:01:50,909 INFO L268 CegarLoopResult]: For program point L27(line 27) no Hoare annotation was computed. [2020-07-21 16:01:50,909 INFO L268 CegarLoopResult]: For program point L26(lines 26 28) no Hoare annotation was computed. [2020-07-21 16:01:50,909 INFO L264 CegarLoopResult]: At program point L25(line 25) the Hoare annotation is: (and (<= main_~x~0 5) (<= 5 main_~x~0)) [2020-07-21 16:01:50,909 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 23 30) no Hoare annotation was computed. [2020-07-21 16:01:50,909 INFO L268 CegarLoopResult]: For program point L25-1(line 25) no Hoare annotation was computed. [2020-07-21 16:01:50,909 INFO L268 CegarLoopResult]: For program point L26-2(lines 26 28) no Hoare annotation was computed. [2020-07-21 16:01:50,910 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 23 30) no Hoare annotation was computed. [2020-07-21 16:01:50,910 INFO L268 CegarLoopResult]: For program point fiboEXIT(lines 5 13) no Hoare annotation was computed. [2020-07-21 16:01:50,910 INFO L268 CegarLoopResult]: For program point fiboFINAL(lines 5 13) no Hoare annotation was computed. [2020-07-21 16:01:50,910 INFO L264 CegarLoopResult]: At program point L11(line 11) the Hoare annotation is: (and (<= fibo_~n |fibo_#in~n|) (<= |fibo_#in~n| fibo_~n) (<= 2 |fibo_#in~n|)) [2020-07-21 16:01:50,910 INFO L268 CegarLoopResult]: For program point L11-1(line 11) no Hoare annotation was computed. [2020-07-21 16:01:50,910 INFO L264 CegarLoopResult]: At program point L11-2(line 11) the Hoare annotation is: (let ((.cse3 (<= fibo_~n |fibo_#in~n|)) (.cse0 (<= |fibo_#in~n| fibo_~n))) (let ((.cse1 (and .cse3 .cse0 (<= 6 |fibo_#in~n|)))) (and (or (and .cse0 (<= |fibo_#in~n| 4)) .cse1 (= |fibo_#t~ret0| 3)) (let ((.cse2 (= |fibo_#t~ret0| 1))) (or (and .cse2 .cse3 (<= 3 |fibo_#in~n|) (<= |fibo_#in~n| 3)) (and .cse2 .cse3 (<= |fibo_#in~n| 2) (<= 2 |fibo_#in~n|)) .cse1 (and (<= 4 |fibo_#in~n|) (= |fibo_#t~ret0| 2) (<= fibo_~n 4)) (and .cse3 (<= 5 fibo_~n) (<= |fibo_#in~n| 5))))))) [2020-07-21 16:01:50,910 INFO L268 CegarLoopResult]: For program point L8(lines 8 12) no Hoare annotation was computed. [2020-07-21 16:01:50,911 INFO L268 CegarLoopResult]: For program point L11-3(line 11) no Hoare annotation was computed. [2020-07-21 16:01:50,911 INFO L268 CegarLoopResult]: For program point L6(lines 6 12) no Hoare annotation was computed. [2020-07-21 16:01:50,911 INFO L271 CegarLoopResult]: At program point fiboENTRY(lines 5 13) the Hoare annotation is: true [2020-07-21 16:01:50,919 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 04:01:50 BoogieIcfgContainer [2020-07-21 16:01:50,919 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 16:01:50,921 INFO L168 Benchmark]: Toolchain (without parser) took 21320.05 ms. Allocated memory was 138.9 MB in the beginning and 405.8 MB in the end (delta: 266.9 MB). Free memory was 103.6 MB in the beginning and 303.7 MB in the end (delta: -200.1 MB). Peak memory consumption was 260.9 MB. Max. memory is 7.1 GB. [2020-07-21 16:01:50,929 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 138.9 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2020-07-21 16:01:50,933 INFO L168 Benchmark]: CACSL2BoogieTranslator took 242.56 ms. Allocated memory is still 138.9 MB. Free memory was 103.2 MB in the beginning and 93.8 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-21 16:01:50,933 INFO L168 Benchmark]: Boogie Preprocessor took 22.52 ms. Allocated memory is still 138.9 MB. Free memory was 93.8 MB in the beginning and 92.5 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-21 16:01:50,934 INFO L168 Benchmark]: RCFGBuilder took 330.23 ms. Allocated memory was 138.9 MB in the beginning and 202.9 MB in the end (delta: 64.0 MB). Free memory was 92.5 MB in the beginning and 170.9 MB in the end (delta: -78.4 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. [2020-07-21 16:01:50,937 INFO L168 Benchmark]: TraceAbstraction took 20717.79 ms. Allocated memory was 202.9 MB in the beginning and 405.8 MB in the end (delta: 202.9 MB). Free memory was 170.3 MB in the beginning and 303.7 MB in the end (delta: -133.4 MB). Peak memory consumption was 263.6 MB. Max. memory is 7.1 GB. [2020-07-21 16:01:50,942 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 138.9 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 242.56 ms. Allocated memory is still 138.9 MB. Free memory was 103.2 MB in the beginning and 93.8 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 22.52 ms. Allocated memory is still 138.9 MB. Free memory was 93.8 MB in the beginning and 92.5 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 330.23 ms. Allocated memory was 138.9 MB in the beginning and 202.9 MB in the end (delta: 64.0 MB). Free memory was 92.5 MB in the beginning and 170.9 MB in the end (delta: -78.4 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 20717.79 ms. Allocated memory was 202.9 MB in the beginning and 405.8 MB in the end (delta: 202.9 MB). Free memory was 170.3 MB in the beginning and 303.7 MB in the end (delta: -133.4 MB). Peak memory consumption was 263.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 27]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 19.9s, OverallIterations: 14, TraceHistogramMax: 31, AutomataDifference: 3.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.6s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 313 SDtfs, 740 SDslu, 1408 SDs, 0 SdLazy, 1675 SolverSat, 787 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2414 GetRequests, 2045 SyntacticMatches, 118 SemanticMatches, 251 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1243 ImplicationChecksByTransitivity, 3.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=75occurred in iteration=13, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 14 MinimizatonAttempts, 66 StatesRemovedByMinimization, 11 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 143 PreInvPairs, 195 NumberOfFragments, 101 HoareAnnotationTreeSize, 143 FomulaSimplifications, 2033 FormulaSimplificationTreeSizeReduction, 0.3s HoareSimplificationTime, 8 FomulaSimplificationsInter, 905 FormulaSimplificationTreeSizeReductionInter, 0.3s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 12.3s InterpolantComputationTime, 1179 NumberOfCodeBlocks, 879 NumberOfCodeBlocksAsserted, 24 NumberOfCheckSat, 2305 ConstructedInterpolants, 0 QuantifiedInterpolants, 602259 SizeOfPredicates, 74 NumberOfNonLiveVariables, 2205 ConjunctsInSsa, 203 ConjunctsInUnsatCore, 26 InterpolantComputations, 2 PerfectInterpolantSequences, 10468/15606 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 correct! Received shutdown request...