/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_FUNCTIONS --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_25-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 13:10:35,603 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 13:10:35,606 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 13:10:35,626 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 13:10:35,626 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 13:10:35,627 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 13:10:35,629 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 13:10:35,630 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 13:10:35,632 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 13:10:35,633 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 13:10:35,634 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 13:10:35,635 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 13:10:35,635 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 13:10:35,636 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 13:10:35,637 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 13:10:35,638 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 13:10:35,639 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 13:10:35,640 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 13:10:35,642 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 13:10:35,644 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 13:10:35,646 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 13:10:35,647 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 13:10:35,648 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 13:10:35,649 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 13:10:35,654 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 13:10:35,665 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 13:10:35,666 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 13:10:35,667 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 13:10:35,668 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 13:10:35,684 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 13:10:35,684 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 13:10:35,685 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 13:10:35,686 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 13:10:35,686 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 13:10:35,686 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 13:10:35,686 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 13:10:35,686 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 13:10:35,687 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 13:10:35,687 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 13:10:35,687 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 13:10:35,687 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 13:10:35,687 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 13:10:35,688 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 13:10:35,688 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 13:10:35,688 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 13:10:35,688 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 13:10:35,688 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 13:10:35,689 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 13:10:35,689 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 13:10:35,689 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 13:10:35,689 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 13:10:35,689 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 13:10:35,689 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 13:10:35,690 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 13:10:35,690 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 13:10:35,690 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:35,690 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 13:10:35,690 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 13:10:35,691 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_FUNCTIONS 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 13:10:35,978 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 13:10:35,998 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 13:10:36,004 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 13:10:36,008 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 13:10:36,009 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 13:10:36,010 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_25-1.c [2020-07-21 13:10:36,093 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b587607f7/470449d919024a5dafd37c5fb3c7a016/FLAG98de82c76 [2020-07-21 13:10:36,604 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 13:10:36,605 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_25-1.c [2020-07-21 13:10:36,612 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b587607f7/470449d919024a5dafd37c5fb3c7a016/FLAG98de82c76 [2020-07-21 13:10:36,970 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b587607f7/470449d919024a5dafd37c5fb3c7a016 [2020-07-21 13:10:36,979 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 13:10:36,982 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 13:10:36,983 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 13:10:36,984 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 13:10:36,987 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 13:10:36,988 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:10:36" (1/1) ... [2020-07-21 13:10:36,992 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@56cdb574 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:36, skipping insertion in model container [2020-07-21 13:10:36,992 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:10:36" (1/1) ... [2020-07-21 13:10:37,000 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 13:10:37,016 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 13:10:37,192 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:10:37,197 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 13:10:37,214 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:10:37,227 INFO L208 MainTranslator]: Completed translation [2020-07-21 13:10:37,228 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:37 WrapperNode [2020-07-21 13:10:37,228 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 13:10:37,229 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 13:10:37,229 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 13:10:37,229 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 13:10:37,240 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:37" (1/1) ... [2020-07-21 13:10:37,240 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:37" (1/1) ... [2020-07-21 13:10:37,245 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:37" (1/1) ... [2020-07-21 13:10:37,245 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:37" (1/1) ... [2020-07-21 13:10:37,248 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:37" (1/1) ... [2020-07-21 13:10:37,250 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:37" (1/1) ... [2020-07-21 13:10:37,251 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:37" (1/1) ... [2020-07-21 13:10:37,252 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 13:10:37,252 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 13:10:37,253 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 13:10:37,253 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 13:10:37,254 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:37" (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 13:10:37,421 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 13:10:37,421 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 13:10:37,421 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 13:10:37,421 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 13:10:37,422 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 13:10:37,422 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 13:10:37,423 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 13:10:37,423 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 13:10:37,423 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 13:10:37,423 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 13:10:37,612 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 13:10:37,613 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 13:10:37,617 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:10:37 BoogieIcfgContainer [2020-07-21 13:10:37,617 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 13:10:37,619 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 13:10:37,619 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 13:10:37,622 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 13:10:37,623 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:10:36" (1/3) ... [2020-07-21 13:10:37,624 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f3aa2ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:10:37, skipping insertion in model container [2020-07-21 13:10:37,624 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:10:37" (2/3) ... [2020-07-21 13:10:37,624 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f3aa2ef and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:10:37, skipping insertion in model container [2020-07-21 13:10:37,625 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:10:37" (3/3) ... [2020-07-21 13:10:37,627 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_25-1.c [2020-07-21 13:10:37,638 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 13:10:37,647 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 13:10:37,662 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 13:10:37,688 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 13:10:37,688 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 13:10:37,688 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 13:10:37,688 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 13:10:37,689 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 13:10:37,689 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 13:10:37,689 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 13:10:37,689 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 13:10:37,705 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 13:10:37,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 13:10:37,711 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:37,712 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:10:37,712 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:37,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:37,719 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 13:10:37,728 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:37,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1172573312] [2020-07-21 13:10:37,729 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 13:10:37,797 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:37,797 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:37,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 13:10:37,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:37,910 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 13:10:37,911 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:10:37,912 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1172573312] [2020-07-21 13:10:37,912 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:10:37,913 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 13:10:37,914 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297898026] [2020-07-21 13:10:37,920 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 13:10:37,920 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:37,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 13:10:37,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:10:37,946 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 13:10:38,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:38,062 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 13:10:38,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 13:10:38,064 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 13:10:38,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:38,076 INFO L225 Difference]: With dead ends: 35 [2020-07-21 13:10:38,076 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 13:10:38,080 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 13:10:38,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 13:10:38,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 13:10:38,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 13:10:38,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 13:10:38,171 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 13:10:38,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:38,172 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 13:10:38,172 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 13:10:38,172 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 13:10:38,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 13:10:38,175 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:38,175 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:10:38,390 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:38,391 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:38,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:38,392 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 13:10:38,393 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:38,393 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [774422311] [2020-07-21 13:10:38,394 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 13:10:38,424 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:38,425 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:38,426 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 13:10:38,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:38,471 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 13:10:38,472 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:10:38,472 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [774422311] [2020-07-21 13:10:38,473 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:10:38,473 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 13:10:38,473 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [335636707] [2020-07-21 13:10:38,475 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 13:10:38,476 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:38,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 13:10:38,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:10:38,477 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 13:10:38,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:38,538 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 13:10:38,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 13:10:38,539 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 13:10:38,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:38,540 INFO L225 Difference]: With dead ends: 27 [2020-07-21 13:10:38,541 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 13:10:38,542 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 13:10:38,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 13:10:38,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 13:10:38,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 13:10:38,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 13:10:38,551 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 13:10:38,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:38,552 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 13:10:38,552 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 13:10:38,552 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 13:10:38,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 13:10:38,554 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:38,554 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 13:10:38,768 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:38,769 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:38,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:38,772 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 13:10:38,773 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:38,773 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1309265663] [2020-07-21 13:10:38,775 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 13:10:38,821 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:38,822 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:38,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 13:10:38,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:38,869 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 13:10:38,869 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:39,052 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:39,103 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 13:10:39,103 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1309265663] [2020-07-21 13:10:39,104 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:10:39,104 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 13:10:39,105 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [389712392] [2020-07-21 13:10:39,105 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 13:10:39,105 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:39,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 13:10:39,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 13:10:39,107 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 13:10:39,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:39,249 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 13:10:39,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 13:10:39,251 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 13:10:39,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:39,254 INFO L225 Difference]: With dead ends: 32 [2020-07-21 13:10:39,254 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 13:10:39,257 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 13:10:39,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 13:10:39,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 13:10:39,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 13:10:39,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 13:10:39,277 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 13:10:39,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:39,278 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 13:10:39,278 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 13:10:39,278 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 13:10:39,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 13:10:39,282 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:39,282 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 13:10:39,496 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:39,497 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:39,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:39,498 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 13:10:39,499 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:39,499 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1511382756] [2020-07-21 13:10:39,500 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 13:10:39,541 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:39,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:39,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 13:10:39,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:39,580 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 13:10:39,580 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:39,723 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:39,757 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 13:10:39,758 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1511382756] [2020-07-21 13:10:39,758 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:10:39,758 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 13:10:39,759 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077969528] [2020-07-21 13:10:39,759 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 13:10:39,760 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:39,760 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 13:10:39,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 13:10:39,760 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 13:10:39,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:39,842 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 13:10:39,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 13:10:39,843 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 13:10:39,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:39,845 INFO L225 Difference]: With dead ends: 37 [2020-07-21 13:10:39,845 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 13:10:39,846 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 13:10:39,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 13:10:39,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 13:10:39,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 13:10:39,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 13:10:39,855 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 13:10:39,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:39,856 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 13:10:39,856 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 13:10:39,856 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 13:10:39,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 13:10:39,858 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:39,858 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 13:10:40,070 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:40,071 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:40,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:40,071 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 13:10:40,072 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:40,072 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [82540980] [2020-07-21 13:10:40,073 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 13:10:40,108 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:40,108 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:40,109 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:10:40,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:40,184 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 13:10:40,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:40,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:40,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:40,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:40,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:40,599 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 13:10:40,600 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [82540980] [2020-07-21 13:10:40,600 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:10:40,600 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 13:10:40,601 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128222025] [2020-07-21 13:10:40,601 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 13:10:40,602 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:40,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 13:10:40,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 13:10:40,603 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 13:10:40,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:40,751 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 13:10:40,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 13:10:40,751 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 13:10:40,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:40,753 INFO L225 Difference]: With dead ends: 42 [2020-07-21 13:10:40,754 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 13:10:40,755 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 13:10:40,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 13:10:40,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 13:10:40,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 13:10:40,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 13:10:40,765 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 13:10:40,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:40,766 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 13:10:40,766 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 13:10:40,766 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 13:10:40,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 13:10:40,768 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:40,768 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 13:10:40,982 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:40,983 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:40,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:40,984 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 13:10:40,985 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:40,985 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [151345687] [2020-07-21 13:10:40,986 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 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 13:10:41,021 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:41,021 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:41,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:10:41,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:41,084 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 13:10:41,085 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:41,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:41,341 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:41,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:41,377 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 13:10:41,377 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [151345687] [2020-07-21 13:10:41,377 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:10:41,378 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 13:10:41,378 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601962303] [2020-07-21 13:10:41,379 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 13:10:41,379 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:41,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 13:10:41,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 13:10:41,380 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 13:10:41,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:41,513 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 13:10:41,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 13:10:41,513 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 13:10:41,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:41,516 INFO L225 Difference]: With dead ends: 47 [2020-07-21 13:10:41,516 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 13:10:41,517 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 13:10:41,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 13:10:41,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 13:10:41,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 13:10:41,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 13:10:41,528 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 13:10:41,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:41,529 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 13:10:41,529 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 13:10:41,529 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 13:10:41,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 13:10:41,531 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:41,531 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 13:10:41,744 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:41,745 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:41,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:41,746 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 13:10:41,746 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:41,747 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1378747378] [2020-07-21 13:10:41,747 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 13:10:41,793 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:41,794 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:41,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:10:41,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:41,850 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 13:10:41,851 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:42,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:42,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:42,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:42,426 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:42,427 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:42,476 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 13:10:42,477 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1378747378] [2020-07-21 13:10:42,477 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:10:42,477 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 13:10:42,478 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890255205] [2020-07-21 13:10:42,479 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 13:10:42,480 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:42,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 13:10:42,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 13:10:42,480 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 13:10:42,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:42,658 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 13:10:42,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 13:10:42,659 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 13:10:42,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:42,663 INFO L225 Difference]: With dead ends: 52 [2020-07-21 13:10:42,663 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 13:10:42,664 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 13:10:42,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 13:10:42,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 13:10:42,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 13:10:42,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 13:10:42,679 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 13:10:42,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:42,684 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 13:10:42,684 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 13:10:42,684 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 13:10:42,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 13:10:42,693 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:42,694 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 13:10:42,907 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:42,907 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:42,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:42,908 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 13:10:42,909 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:42,909 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1957206204] [2020-07-21 13:10:42,909 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 13:10:42,969 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:42,970 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:42,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:10:42,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:43,063 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-21 13:10:43,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:43,491 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:43,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:43,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:43,643 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:43,680 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-21 13:10:43,680 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1957206204] [2020-07-21 13:10:43,680 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:10:43,681 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 13:10:43,681 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1098005751] [2020-07-21 13:10:43,682 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 13:10:43,682 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:43,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 13:10:43,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 13:10:43,683 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-21 13:10:43,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:43,830 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 13:10:43,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 13:10:43,833 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-21 13:10:43,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:43,837 INFO L225 Difference]: With dead ends: 57 [2020-07-21 13:10:43,837 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 13:10:43,839 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 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 13:10:43,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 13:10:43,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 13:10:43,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 13:10:43,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 13:10:43,867 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 13:10:43,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:43,868 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 13:10:43,868 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 13:10:43,868 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 13:10:43,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 13:10:43,874 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:43,874 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:10:44,075 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:44,076 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:44,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:44,077 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 13:10:44,078 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:44,078 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1335718146] [2020-07-21 13:10:44,078 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 13:10:44,153 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:44,153 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:44,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:10:44,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:44,266 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-21 13:10:44,266 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:44,847 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:44,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:45,023 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:45,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:45,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:45,231 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 13:10:45,232 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1335718146] [2020-07-21 13:10:45,232 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:10:45,232 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 13:10:45,232 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1680048262] [2020-07-21 13:10:45,233 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:10:45,233 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:45,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:10:45,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:10:45,234 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-21 13:10:45,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:45,507 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 13:10:45,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:10:45,508 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-21 13:10:45,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:45,512 INFO L225 Difference]: With dead ends: 62 [2020-07-21 13:10:45,512 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 13:10:45,513 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 13:10:45,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 13:10:45,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 13:10:45,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 13:10:45,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 13:10:45,526 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 13:10:45,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:45,526 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 13:10:45,526 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:10:45,527 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 13:10:45,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 13:10:45,530 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:45,530 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:10:45,743 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:45,744 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:45,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:45,745 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 13:10:45,746 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:45,746 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [791356420] [2020-07-21 13:10:45,747 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 13:10:45,836 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:45,836 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:45,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:10:45,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:45,923 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-21 13:10:45,923 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:46,640 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:46,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:46,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:46,919 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:46,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:46,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:47,023 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-21 13:10:47,024 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [791356420] [2020-07-21 13:10:47,024 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:10:47,024 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 13:10:47,025 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710217461] [2020-07-21 13:10:47,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:10:47,026 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:47,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:10:47,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:10:47,027 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-21 13:10:47,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:47,207 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-21 13:10:47,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:10:47,207 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-21 13:10:47,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:47,211 INFO L225 Difference]: With dead ends: 67 [2020-07-21 13:10:47,211 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 13:10:47,212 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 13:10:47,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 13:10:47,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-21 13:10:47,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 13:10:47,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 13:10:47,230 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-21 13:10:47,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:47,231 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 13:10:47,231 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:10:47,231 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 13:10:47,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 13:10:47,240 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:47,240 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:10:47,441 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:47,442 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:47,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:47,443 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-21 13:10:47,443 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:47,444 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [302043238] [2020-07-21 13:10:47,444 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 13:10:47,573 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:47,573 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:47,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 640 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 13:10:47,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:47,700 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-21 13:10:47,701 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:48,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:49,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:49,414 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:49,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:49,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:49,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:49,648 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-21 13:10:49,649 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [302043238] [2020-07-21 13:10:49,649 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:10:49,649 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 13:10:49,650 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [509880222] [2020-07-21 13:10:49,653 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 13:10:49,653 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:49,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 13:10:49,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 13:10:49,654 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-21 13:10:49,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:49,866 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-21 13:10:49,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:10:49,867 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-21 13:10:49,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:49,873 INFO L225 Difference]: With dead ends: 72 [2020-07-21 13:10:49,873 INFO L226 Difference]: Without dead ends: 68 [2020-07-21 13:10:49,875 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:10:49,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-21 13:10:49,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-21 13:10:49,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 13:10:49,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 13:10:49,902 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-21 13:10:49,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:49,903 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 13:10:49,903 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 13:10:49,903 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 13:10:49,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2020-07-21 13:10:49,909 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:49,910 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 35, 21, 21, 21, 21, 21, 21, 21, 14, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:10:50,125 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:50,126 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:50,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:50,127 INFO L82 PathProgramCache]: Analyzing trace with hash -1101007572, now seen corresponding path program 5 times [2020-07-21 13:10:50,127 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:50,127 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1439712736] [2020-07-21 13:10:50,128 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 13:10:50,284 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:50,284 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:50,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 668 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 13:10:50,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:50,479 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1061 refuted. 0 times theorem prover too weak. 3827 trivial. 0 not checked. [2020-07-21 13:10:50,479 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:51,753 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:52,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:52,265 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:52,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:52,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:52,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:52,485 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1101 refuted. 0 times theorem prover too weak. 3787 trivial. 0 not checked. [2020-07-21 13:10:52,486 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1439712736] [2020-07-21 13:10:52,486 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:10:52,487 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 13:10:52,487 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136725810] [2020-07-21 13:10:52,488 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 13:10:52,489 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:52,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 13:10:52,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 13:10:52,490 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-21 13:10:52,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:52,757 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-21 13:10:52,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:10:52,757 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 300 [2020-07-21 13:10:52,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:52,767 INFO L225 Difference]: With dead ends: 77 [2020-07-21 13:10:52,767 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 13:10:52,769 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 605 GetRequests, 572 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:10:52,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 13:10:52,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-21 13:10:52,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 13:10:52,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 13:10:52,794 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 300 [2020-07-21 13:10:52,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:52,795 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 13:10:52,795 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 13:10:52,795 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 13:10:52,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 469 [2020-07-21 13:10:52,800 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:52,801 INFO L422 BasicCegarLoop]: trace histogram [71, 71, 36, 35, 35, 35, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:10:53,014 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:53,015 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:53,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:53,016 INFO L82 PathProgramCache]: Analyzing trace with hash -897924696, now seen corresponding path program 6 times [2020-07-21 13:10:53,016 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:53,016 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [616089562] [2020-07-21 13:10:53,017 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 13:10:53,230 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:53,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:53,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 1046 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 13:10:53,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:53,484 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 1995 refuted. 0 times theorem prover too weak. 10614 trivial. 0 not checked. [2020-07-21 13:10:53,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:55,410 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:55,930 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:56,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:56,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:56,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:56,454 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:56,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:56,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:56,678 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 2046 refuted. 0 times theorem prover too weak. 10563 trivial. 0 not checked. [2020-07-21 13:10:56,679 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [616089562] [2020-07-21 13:10:56,679 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:10:56,679 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 13:10:56,680 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1057740404] [2020-07-21 13:10:56,681 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 13:10:56,681 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:10:56,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 13:10:56,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 13:10:56,681 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-21 13:10:57,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:10:57,011 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-21 13:10:57,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:10:57,012 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 468 [2020-07-21 13:10:57,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:10:57,016 INFO L225 Difference]: With dead ends: 82 [2020-07-21 13:10:57,017 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 13:10:57,018 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 943 GetRequests, 905 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 13:10:57,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 13:10:57,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-21 13:10:57,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 13:10:57,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 13:10:57,031 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 468 [2020-07-21 13:10:57,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:10:57,032 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 13:10:57,032 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 13:10:57,033 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 13:10:57,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-21 13:10:57,036 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:10:57,037 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:10:57,249 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:10:57,250 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:10:57,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:10:57,251 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-21 13:10:57,251 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:10:57,252 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [113885057] [2020-07-21 13:10:57,252 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 13:10:57,471 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:10:57,471 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:10:57,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 1001 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 13:10:57,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:10:57,707 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-21 13:10:57,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:10:59,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:59,986 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:10:59,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:00,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:00,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:00,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:00,557 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:00,558 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:00,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:00,797 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-21 13:11:00,798 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [113885057] [2020-07-21 13:11:00,798 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:11:00,798 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 13:11:00,799 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618586323] [2020-07-21 13:11:00,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 13:11:00,800 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:11:00,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 13:11:00,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 13:11:00,801 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-21 13:11:01,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:11:01,259 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-21 13:11:01,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:11:01,261 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-21 13:11:01,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:11:01,266 INFO L225 Difference]: With dead ends: 87 [2020-07-21 13:11:01,266 INFO L226 Difference]: Without dead ends: 83 [2020-07-21 13:11:01,269 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 13:11:01,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-21 13:11:01,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-21 13:11:01,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 13:11:01,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 13:11:01,303 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-21 13:11:01,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:11:01,304 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 13:11:01,304 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 13:11:01,305 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 13:11:01,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 872 [2020-07-21 13:11:01,318 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:11:01,319 INFO L422 BasicCegarLoop]: trace histogram [133, 133, 67, 66, 66, 66, 66, 66, 66, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:11:01,532 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:01,533 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:11:01,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:11:01,534 INFO L82 PathProgramCache]: Analyzing trace with hash -1701713687, now seen corresponding path program 7 times [2020-07-21 13:11:01,534 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:11:01,534 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1283494791] [2020-07-21 13:11:01,535 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 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:01,938 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:11:01,938 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:11:01,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 1945 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:11:01,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:11:02,510 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4406 refuted. 0 times theorem prover too weak. 40653 trivial. 0 not checked. [2020-07-21 13:11:02,511 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:11:05,259 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:05,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:06,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:07,217 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:07,218 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:07,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:07,554 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:07,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:07,711 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:07,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:07,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:07,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:08,288 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4476 refuted. 0 times theorem prover too weak. 40583 trivial. 0 not checked. [2020-07-21 13:11:08,289 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1283494791] [2020-07-21 13:11:08,289 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:11:08,290 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 13:11:08,290 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2048663801] [2020-07-21 13:11:08,291 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:11:08,292 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:11:08,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:11:08,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:11:08,293 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-21 13:11:08,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:11:08,684 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-21 13:11:08,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 13:11:08,685 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 871 [2020-07-21 13:11:08,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:11:08,691 INFO L225 Difference]: With dead ends: 92 [2020-07-21 13:11:08,691 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 13:11:08,694 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1750 GetRequests, 1707 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:11:08,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 13:11:08,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-21 13:11:08,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 13:11:08,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 13:11:08,722 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 871 [2020-07-21 13:11:08,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:11:08,723 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 13:11:08,723 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:11:08,723 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 13:11:08,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1229 [2020-07-21 13:11:08,740 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:11:08,741 INFO L422 BasicCegarLoop]: trace histogram [179, 179, 147, 89, 89, 89, 89, 89, 89, 89, 58, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:11:08,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:08,942 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:11:08,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:11:08,943 INFO L82 PathProgramCache]: Analyzing trace with hash 104339052, now seen corresponding path program 7 times [2020-07-21 13:11:08,943 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:11:08,944 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1292802451] [2020-07-21 13:11:08,944 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 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:09,423 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:11:09,423 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:11:09,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 2728 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:11:09,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:11:10,266 INFO L134 CoverageAnalysis]: Checked inductivity of 90119 backedges. 893 proven. 6738 refuted. 0 times theorem prover too weak. 82488 trivial. 0 not checked. [2020-07-21 13:11:10,267 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:11:14,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:14,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:15,648 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:16,275 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:16,276 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:16,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:16,668 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:16,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:16,940 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:16,997 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:17,673 INFO L134 CoverageAnalysis]: Checked inductivity of 90119 backedges. 893 proven. 6815 refuted. 0 times theorem prover too weak. 82411 trivial. 0 not checked. [2020-07-21 13:11:17,674 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1292802451] [2020-07-21 13:11:17,674 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:11:17,675 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 13:11:17,675 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842810466] [2020-07-21 13:11:17,677 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 13:11:17,677 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:11:17,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 13:11:17,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:11:17,678 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-21 13:11:18,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:11:18,278 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-21 13:11:18,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 13:11:18,278 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1228 [2020-07-21 13:11:18,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:11:18,286 INFO L225 Difference]: With dead ends: 97 [2020-07-21 13:11:18,286 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 13:11:18,287 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2463 GetRequests, 2420 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:11:18,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 13:11:18,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-21 13:11:18,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 13:11:18,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 13:11:18,309 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1228 [2020-07-21 13:11:18,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:11:18,311 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 13:11:18,311 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 13:11:18,311 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 13:11:18,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1951 [2020-07-21 13:11:18,352 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:11:18,353 INFO L422 BasicCegarLoop]: trace histogram [299, 299, 150, 149, 149, 149, 149, 149, 149, 149, 149, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:11:18,568 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:18,570 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:11:18,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:11:18,571 INFO L82 PathProgramCache]: Analyzing trace with hash 621098440, now seen corresponding path program 8 times [2020-07-21 13:11:18,571 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:11:18,571 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [688737375] [2020-07-21 13:11:18,572 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 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:19,326 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:11:19,327 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:11:19,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 4352 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 13:11:19,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:11:20,991 INFO L134 CoverageAnalysis]: Checked inductivity of 233334 backedges. 1708 proven. 11918 refuted. 0 times theorem prover too weak. 219708 trivial. 0 not checked. [2020-07-21 13:11:20,991 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:11:27,903 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:29,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:31,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:31,763 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:31,764 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:32,148 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:32,149 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:32,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:32,452 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:32,453 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:32,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:32,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:34,023 INFO L134 CoverageAnalysis]: Checked inductivity of 233334 backedges. 1708 proven. 12010 refuted. 0 times theorem prover too weak. 219616 trivial. 0 not checked. [2020-07-21 13:11:34,024 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [688737375] [2020-07-21 13:11:34,025 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:11:34,025 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 13:11:34,026 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648639111] [2020-07-21 13:11:34,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 13:11:34,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:11:34,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 13:11:34,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:11:34,029 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-21 13:11:34,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:11:34,487 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-21 13:11:34,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:11:34,488 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1950 [2020-07-21 13:11:34,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:11:34,496 INFO L225 Difference]: With dead ends: 102 [2020-07-21 13:11:34,496 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 13:11:34,498 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3909 GetRequests, 3861 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 13:11:34,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 13:11:34,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-21 13:11:34,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 13:11:34,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 13:11:34,517 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1950 [2020-07-21 13:11:34,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:11:34,521 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 13:11:34,521 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 13:11:34,521 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 13:11:34,559 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1690 [2020-07-21 13:11:34,560 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:11:34,561 INFO L422 BasicCegarLoop]: trace histogram [245, 245, 212, 122, 122, 122, 122, 122, 122, 122, 90, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:11:34,773 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:34,774 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:11:34,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:11:34,775 INFO L82 PathProgramCache]: Analyzing trace with hash 249367267, now seen corresponding path program 8 times [2020-07-21 13:11:34,776 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:11:34,776 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1704743408] [2020-07-21 13:11:34,776 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 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:35,480 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:11:35,481 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:11:35,492 INFO L263 TraceCheckSpWp]: Trace formula consists of 3749 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 13:11:35,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:11:37,521 INFO L134 CoverageAnalysis]: Checked inductivity of 171450 backedges. 1545 proven. 10458 refuted. 0 times theorem prover too weak. 159447 trivial. 0 not checked. [2020-07-21 13:11:37,522 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:11:42,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:45,068 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:45,069 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:46,546 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:46,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:47,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:47,395 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:47,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:47,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:47,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:47,763 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:11:48,890 INFO L134 CoverageAnalysis]: Checked inductivity of 171450 backedges. 1545 proven. 10558 refuted. 0 times theorem prover too weak. 159347 trivial. 0 not checked. [2020-07-21 13:11:48,891 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1704743408] [2020-07-21 13:11:48,891 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:11:48,891 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 13:11:48,892 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325050765] [2020-07-21 13:11:48,893 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 13:11:48,894 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:11:48,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 13:11:48,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:11:48,894 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-21 13:11:49,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:11:49,364 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-21 13:11:49,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:11:49,366 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1689 [2020-07-21 13:11:49,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:11:49,373 INFO L225 Difference]: With dead ends: 107 [2020-07-21 13:11:49,373 INFO L226 Difference]: Without dead ends: 103 [2020-07-21 13:11:49,374 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3386 GetRequests, 3338 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 13:11:49,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-21 13:11:49,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-21 13:11:49,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 13:11:49,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 13:11:49,390 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1689 [2020-07-21 13:11:49,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:11:49,392 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 13:11:49,392 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 13:11:49,392 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 13:11:49,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2341 [2020-07-21 13:11:49,451 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:11:49,452 INFO L422 BasicCegarLoop]: trace histogram [359, 359, 180, 179, 179, 179, 179, 179, 179, 179, 179, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:11:49,653 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:49,654 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:11:49,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:11:49,655 INFO L82 PathProgramCache]: Analyzing trace with hash 1393099828, now seen corresponding path program 9 times [2020-07-21 13:11:49,656 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:11:49,656 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1052421479] [2020-07-21 13:11:49,656 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 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:11:50,595 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:11:50,595 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:11:50,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 5222 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 13:11:50,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:11:53,124 INFO L134 CoverageAnalysis]: Checked inductivity of 336699 backedges. 2291 proven. 16027 refuted. 0 times theorem prover too weak. 318381 trivial. 0 not checked. [2020-07-21 13:11:53,124 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:12:01,040 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:04,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:06,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:07,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:07,252 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:07,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:07,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:08,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:08,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:08,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:08,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:08,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:10,291 INFO L134 CoverageAnalysis]: Checked inductivity of 336699 backedges. 2291 proven. 16144 refuted. 0 times theorem prover too weak. 318264 trivial. 0 not checked. [2020-07-21 13:12:10,291 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1052421479] [2020-07-21 13:12:10,291 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:12:10,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 13:12:10,292 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500541488] [2020-07-21 13:12:10,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 13:12:10,294 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:12:10,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 13:12:10,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 13:12:10,295 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-21 13:12:10,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:12:10,999 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-21 13:12:10,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 13:12:11,000 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2340 [2020-07-21 13:12:11,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:12:11,007 INFO L225 Difference]: With dead ends: 112 [2020-07-21 13:12:11,007 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 13:12:11,008 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4690 GetRequests, 4637 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 13:12:11,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 13:12:11,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-21 13:12:11,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 13:12:11,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 13:12:11,023 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2340 [2020-07-21 13:12:11,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:12:11,025 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 13:12:11,025 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 13:12:11,025 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 13:12:11,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3629 [2020-07-21 13:12:11,132 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:12:11,133 INFO L422 BasicCegarLoop]: trace histogram [531, 531, 435, 265, 265, 265, 265, 265, 265, 265, 170, 96, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:12:11,346 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:12:11,347 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:12:11,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:12:11,349 INFO L82 PathProgramCache]: Analyzing trace with hash -161498836, now seen corresponding path program 9 times [2020-07-21 13:12:11,350 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:12:11,350 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [169148313] [2020-07-21 13:12:11,350 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 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:12:12,680 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:12:12,680 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:12:12,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 8056 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 13:12:12,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:12:16,821 INFO L134 CoverageAnalysis]: Checked inductivity of 797175 backedges. 3064 proven. 26230 refuted. 0 times theorem prover too weak. 767881 trivial. 0 not checked. [2020-07-21 13:12:16,821 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:12:29,381 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:33,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:35,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:35,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:37,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:37,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:38,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:38,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:38,554 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:38,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:38,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:38,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:12:42,777 INFO L134 CoverageAnalysis]: Checked inductivity of 797175 backedges. 3064 proven. 26356 refuted. 0 times theorem prover too weak. 767755 trivial. 0 not checked. [2020-07-21 13:12:42,777 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [169148313] [2020-07-21 13:12:42,777 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:12:42,778 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 13:12:42,778 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497353762] [2020-07-21 13:12:42,781 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 13:12:42,781 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:12:42,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 13:12:42,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 13:12:42,781 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-21 13:12:43,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:12:43,601 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-21 13:12:43,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 13:12:43,602 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 3628 [2020-07-21 13:12:43,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:12:43,608 INFO L225 Difference]: With dead ends: 117 [2020-07-21 13:12:43,609 INFO L226 Difference]: Without dead ends: 113 [2020-07-21 13:12:43,610 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7265 GetRequests, 7212 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 13:12:43,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-21 13:12:43,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-21 13:12:43,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 13:12:43,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 13:12:43,627 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 3628 [2020-07-21 13:12:43,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:12:43,629 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 13:12:43,630 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 13:12:43,630 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 13:12:43,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4993 [2020-07-21 13:12:43,829 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:12:43,833 INFO L422 BasicCegarLoop]: trace histogram [767, 767, 384, 383, 383, 383, 383, 383, 383, 383, 383, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:12:44,047 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:12:44,048 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:12:44,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:12:44,049 INFO L82 PathProgramCache]: Analyzing trace with hash 1183728844, now seen corresponding path program 10 times [2020-07-21 13:12:44,049 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:12:44,049 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1638265764] [2020-07-21 13:12:44,050 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 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:12:45,790 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:12:45,790 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:12:45,812 INFO L263 TraceCheckSpWp]: Trace formula consists of 11138 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 13:12:45,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:12:54,206 INFO L134 CoverageAnalysis]: Checked inductivity of 1540809 backedges. 4544 proven. 39299 refuted. 0 times theorem prover too weak. 1496966 trivial. 0 not checked. [2020-07-21 13:12:54,207 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:13:13,409 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:13,410 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:20,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:23,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:25,440 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:26,651 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:27,261 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:27,262 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:27,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:27,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:27,883 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:27,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:13:36,011 INFO L134 CoverageAnalysis]: Checked inductivity of 1540809 backedges. 4544 proven. 39444 refuted. 0 times theorem prover too weak. 1496821 trivial. 0 not checked. [2020-07-21 13:13:36,011 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1638265764] [2020-07-21 13:13:36,012 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:13:36,013 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 13:13:36,013 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908207827] [2020-07-21 13:13:36,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 13:13:36,016 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:13:36,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 13:13:36,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 13:13:36,017 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-21 13:13:36,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:13:36,685 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-21 13:13:36,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 13:13:36,686 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 4992 [2020-07-21 13:13:36,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:13:36,697 INFO L225 Difference]: With dead ends: 122 [2020-07-21 13:13:36,697 INFO L226 Difference]: Without dead ends: 118 [2020-07-21 13:13:36,698 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9995 GetRequests, 9937 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 13:13:36,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-21 13:13:36,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-21 13:13:36,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 13:13:36,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 13:13:36,719 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 4992 [2020-07-21 13:13:36,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:13:36,723 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 13:13:36,723 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 13:13:36,723 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 13:13:37,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5996 [2020-07-21 13:13:37,076 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:13:37,079 INFO L422 BasicCegarLoop]: trace histogram [881, 881, 702, 440, 440, 440, 440, 440, 440, 440, 262, 179, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:13:37,293 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:13:37,294 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:13:37,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:13:37,295 INFO L82 PathProgramCache]: Analyzing trace with hash 139899581, now seen corresponding path program 10 times [2020-07-21 13:13:37,295 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:13:37,295 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [389868416] [2020-07-21 13:13:37,296 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 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:13:39,364 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:13:39,365 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:13:39,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 13315 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 13:13:39,443 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:13:50,217 INFO L134 CoverageAnalysis]: Checked inductivity of 2182931 backedges. 5417 proven. 48339 refuted. 0 times theorem prover too weak. 2129175 trivial. 0 not checked. [2020-07-21 13:13:50,218 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:14:14,063 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:21,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:21,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:26,559 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:26,560 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:28,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:28,534 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:30,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:30,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:30,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:30,919 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:31,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:31,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:31,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:31,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:31,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:31,696 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:14:43,288 INFO L134 CoverageAnalysis]: Checked inductivity of 2182931 backedges. 5417 proven. 48494 refuted. 0 times theorem prover too weak. 2129020 trivial. 0 not checked. [2020-07-21 13:14:43,288 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [389868416] [2020-07-21 13:14:43,288 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:14:43,290 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 13:14:43,290 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [74317190] [2020-07-21 13:14:43,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 13:14:43,294 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:14:43,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 13:14:43,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 13:14:43,294 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-21 13:14:44,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:14:44,252 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-21 13:14:44,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 13:14:44,256 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 5995 [2020-07-21 13:14:44,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:14:44,266 INFO L225 Difference]: With dead ends: 127 [2020-07-21 13:14:44,266 INFO L226 Difference]: Without dead ends: 123 [2020-07-21 13:14:44,270 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12000 GetRequests, 11942 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 13:14:44,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-21 13:14:44,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-21 13:14:44,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 13:14:44,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 13:14:44,292 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 5995 [2020-07-21 13:14:44,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:14:44,296 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 13:14:44,296 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 13:14:44,296 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 13:14:44,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8581 [2020-07-21 13:14:44,702 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:14:44,705 INFO L422 BasicCegarLoop]: trace histogram [1319, 1319, 660, 659, 659, 659, 659, 659, 659, 659, 659, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:14:44,906 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:14:44,906 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:14:44,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:14:44,910 INFO L82 PathProgramCache]: Analyzing trace with hash -36972020, now seen corresponding path program 11 times [2020-07-21 13:14:44,910 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:14:44,911 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1286437195] [2020-07-21 13:14:44,911 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 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:14:47,895 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:14:47,895 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:14:47,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 19142 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 13:14:48,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:15:13,384 INFO L134 CoverageAnalysis]: Checked inductivity of 4560939 backedges. 7936 proven. 75053 refuted. 0 times theorem prover too weak. 4477950 trivial. 0 not checked. [2020-07-21 13:15:13,384 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:15:50,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:05,099 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:10,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:10,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:14,677 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:14,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:16,791 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:18,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:18,048 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:18,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:18,615 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:18,984 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:19,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:19,191 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:19,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:19,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:16:42,635 INFO L134 CoverageAnalysis]: Checked inductivity of 4560939 backedges. 7936 proven. 75229 refuted. 0 times theorem prover too weak. 4477774 trivial. 0 not checked. [2020-07-21 13:16:42,635 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1286437195] [2020-07-21 13:16:42,636 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:16:42,637 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 13:16:42,638 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401194258] [2020-07-21 13:16:42,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 13:16:42,644 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:16:42,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 13:16:42,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:16:42,645 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-21 13:16:43,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:16:43,527 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-21 13:16:43,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 13:16:43,528 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 8580 [2020-07-21 13:16:43,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:16:43,539 INFO L225 Difference]: With dead ends: 132 [2020-07-21 13:16:43,540 INFO L226 Difference]: Without dead ends: 128 [2020-07-21 13:16:43,541 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17172 GetRequests, 17109 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 13:16:43,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-21 13:16:43,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-21 13:16:43,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 13:16:43,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 13:16:43,564 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 8580 [2020-07-21 13:16:43,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:16:43,569 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 13:16:43,569 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 13:16:43,569 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 13:16:44,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8525 [2020-07-21 13:16:44,346 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:16:44,350 INFO L422 BasicCegarLoop]: trace histogram [1247, 1247, 1035, 623, 623, 623, 623, 623, 623, 623, 412, 212, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:16:44,564 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:16:44,565 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:16:44,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:16:44,568 INFO L82 PathProgramCache]: Analyzing trace with hash -25327092, now seen corresponding path program 11 times [2020-07-21 13:16:44,568 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:16:44,568 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [147804387] [2020-07-21 13:16:44,569 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 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:16:47,607 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:16:47,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:16:47,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 18922 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 13:16:47,723 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:17:10,768 INFO L134 CoverageAnalysis]: Checked inductivity of 4417631 backedges. 9093 proven. 74868 refuted. 0 times theorem prover too weak. 4333670 trivial. 0 not checked. [2020-07-21 13:17:10,769 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:17:42,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:42,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:17:55,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:06,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:06,759 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:12,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:12,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:15,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:15,123 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:16,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:16,503 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:17,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:18,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:18,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:18,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:18,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:18,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:18,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:18:43,476 INFO L134 CoverageAnalysis]: Checked inductivity of 4417631 backedges. 9093 proven. 75055 refuted. 0 times theorem prover too weak. 4333483 trivial. 0 not checked. [2020-07-21 13:18:43,476 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [147804387] [2020-07-21 13:18:43,476 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:18:43,478 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 13:18:43,478 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652900334] [2020-07-21 13:18:43,481 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 13:18:43,481 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:18:43,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 13:18:43,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 13:18:43,482 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-21 13:18:44,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:18:44,804 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-21 13:18:44,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 13:18:44,805 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 8524 [2020-07-21 13:18:44,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:18:44,815 INFO L225 Difference]: With dead ends: 137 [2020-07-21 13:18:44,815 INFO L226 Difference]: Without dead ends: 133 [2020-07-21 13:18:44,817 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17059 GetRequests, 16996 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 13:18:44,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-21 13:18:44,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-21 13:18:44,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 13:18:44,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 13:18:44,842 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 8524 [2020-07-21 13:18:44,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:18:44,846 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 13:18:44,846 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 13:18:44,846 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 13:18:45,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12637 [2020-07-21 13:18:45,871 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:18:45,875 INFO L422 BasicCegarLoop]: trace histogram [1943, 1943, 972, 971, 971, 971, 971, 971, 971, 971, 971, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:18:46,076 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:46,077 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:18:46,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:18:46,081 INFO L82 PathProgramCache]: Analyzing trace with hash 2123078736, now seen corresponding path program 12 times [2020-07-21 13:18:46,081 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:18:46,081 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [156759026] [2020-07-21 13:18:46,082 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 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:18:50,627 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:18:50,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:18:50,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 28190 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 13:18:50,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:41,109 INFO L134 CoverageAnalysis]: Checked inductivity of 9901287 backedges. 13939 proven. 119225 refuted. 0 times theorem prover too weak. 9768123 trivial. 0 not checked. [2020-07-21 13:19:41,110 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:19:53,186 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-21 13:20:34,733 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:12,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:12,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:31,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:31,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:38,056 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:44,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:46,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:48,733 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:49,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:49,466 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:49,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:50,262 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:50,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:21:50,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:22:43,893 INFO L134 CoverageAnalysis]: Checked inductivity of 9901287 backedges. 13939 proven. 119435 refuted. 0 times theorem prover too weak. 9767913 trivial. 0 not checked. [2020-07-21 13:22:43,894 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [156759026] [2020-07-21 13:22:43,894 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:22:43,896 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 29] total 31 [2020-07-21 13:22:43,897 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468436659] [2020-07-21 13:22:43,912 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-21 13:22:43,912 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:22:43,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-21 13:22:43,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2020-07-21 13:22:43,913 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 31 states. [2020-07-21 13:22:45,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:22:45,216 INFO L93 Difference]: Finished difference Result 142 states and 768 transitions. [2020-07-21 13:22:45,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 13:22:45,218 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 12636 [2020-07-21 13:22:45,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:22:45,229 INFO L225 Difference]: With dead ends: 142 [2020-07-21 13:22:45,229 INFO L226 Difference]: Without dead ends: 138 [2020-07-21 13:22:45,231 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25285 GetRequests, 25217 SyntacticMatches, 26 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=619, Invalid=1273, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 13:22:45,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2020-07-21 13:22:45,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 81. [2020-07-21 13:22:45,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-21 13:22:45,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 265 transitions. [2020-07-21 13:22:45,257 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 265 transitions. Word has length 12636 [2020-07-21 13:22:45,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:22:45,263 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 265 transitions. [2020-07-21 13:22:45,263 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-21 13:22:45,263 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 265 transitions. [2020-07-21 13:22:46,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14651 [2020-07-21 13:22:46,538 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:22:46,542 INFO L422 BasicCegarLoop]: trace histogram [2151, 2151, 1737, 1075, 1075, 1075, 1075, 1075, 1075, 1075, 662, 414, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:22:46,749 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:22:46,749 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:22:46,750 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:22:46,754 INFO L82 PathProgramCache]: Analyzing trace with hash -1075043156, now seen corresponding path program 12 times [2020-07-21 13:22:46,754 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:22:46,754 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1109180918] [2020-07-21 13:22:46,755 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 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:22:52,007 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:22:52,008 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:22:52,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 32530 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 13:22:52,274 INFO L286 TraceCheckSpWp]: Computing forward predicates...