/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 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_i15_o15-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 13:35:52,812 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 13:35:52,815 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 13:35:52,830 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-07-20 13:35:52,843 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 13:35:52,844 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 13:35:52,845 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 13:35:52,847 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 13:35:52,851 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 13:35:52,853 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 13:35:52,858 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 13:35:52,863 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 13:35:52,865 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 13:35:52,869 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 13:35:52,871 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 13:35:52,873 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 13:35:52,881 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 13:35:52,896 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 13:35:52,897 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 13:35:52,900 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 13:35:52,901 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 13:35:52,933 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 13:35:52,934 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 13:35:52,937 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 13:35:52,938 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 13:35:52,938 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 13:35:52,938 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 13:35:52,938 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 13:35:52,938 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 13:35:52,939 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 13:35:52,939 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 13:35:52,940 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 13:35:52,940 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 13:35:52,941 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 13:35:52,941 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 13:35:52,941 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 13:35:52,942 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 13:35:52,942 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 13:35:52,942 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 13:35:52,942 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 13:35:52,942 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 13:35:52,942 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 13:35:52,942 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:35:52,943 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 13:35:52,943 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 13:35:52,943 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 13:35:52,943 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 13:35:52,943 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:52,943 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 13:35:52,943 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 13:35:52,944 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 -> 4 [2020-07-20 13:35:53,325 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 13:35:53,342 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 13:35:53,346 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 13:35:53,348 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 13:35:53,349 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 13:35:53,350 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_i15_o15-2.c [2020-07-20 13:35:53,432 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/566bd8daa/d56f331ddc004b51b48ef9706856937c/FLAG3540997cd [2020-07-20 13:35:53,925 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 13:35:53,925 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_i15_o15-2.c [2020-07-20 13:35:53,933 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/566bd8daa/d56f331ddc004b51b48ef9706856937c/FLAG3540997cd [2020-07-20 13:35:54,292 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/566bd8daa/d56f331ddc004b51b48ef9706856937c [2020-07-20 13:35:54,304 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 13:35:54,307 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 13:35:54,308 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 13:35:54,309 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 13:35:54,313 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 13:35:54,315 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:35:54" (1/1) ... [2020-07-20 13:35:54,319 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3614aa0d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:54, skipping insertion in model container [2020-07-20 13:35:54,320 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:35:54" (1/1) ... [2020-07-20 13:35:54,331 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 13:35:54,351 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 13:35:54,536 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:35:54,542 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 13:35:54,560 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:35:54,579 INFO L208 MainTranslator]: Completed translation [2020-07-20 13:35:54,580 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:54 WrapperNode [2020-07-20 13:35:54,580 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 13:35:54,581 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 13:35:54,582 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 13:35:54,582 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 13:35:54,598 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:54" (1/1) ... [2020-07-20 13:35:54,599 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:54" (1/1) ... [2020-07-20 13:35:54,605 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:54" (1/1) ... [2020-07-20 13:35:54,606 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:54" (1/1) ... [2020-07-20 13:35:54,610 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:54" (1/1) ... [2020-07-20 13:35:54,613 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:54" (1/1) ... [2020-07-20 13:35:54,614 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:54" (1/1) ... [2020-07-20 13:35:54,616 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 13:35:54,617 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 13:35:54,617 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 13:35:54,617 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 13:35:54,619 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:54" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:35:54,820 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 13:35:54,820 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 13:35:54,820 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-20 13:35:54,820 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 13:35:54,821 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 13:35:54,821 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 13:35:54,821 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-20 13:35:54,821 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 13:35:54,821 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 13:35:54,822 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 13:35:55,021 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 13:35:55,022 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 13:35:55,027 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:35:55 BoogieIcfgContainer [2020-07-20 13:35:55,027 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 13:35:55,029 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 13:35:55,029 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 13:35:55,033 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 13:35:55,033 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:35:54" (1/3) ... [2020-07-20 13:35:55,039 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a3238d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:35:55, skipping insertion in model container [2020-07-20 13:35:55,039 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:35:54" (2/3) ... [2020-07-20 13:35:55,040 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a3238d8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:35:55, skipping insertion in model container [2020-07-20 13:35:55,041 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:35:55" (3/3) ... [2020-07-20 13:35:55,043 INFO L109 eAbstractionObserver]: Analyzing ICFG id_i15_o15-2.c [2020-07-20 13:35:55,059 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 13:35:55,071 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 13:35:55,092 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 13:35:55,126 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 13:35:55,127 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 13:35:55,127 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 13:35:55,127 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 13:35:55,127 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 13:35:55,128 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 13:35:55,128 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 13:35:55,128 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 13:35:55,150 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-20 13:35:55,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 13:35:55,160 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:55,161 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:55,162 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:55,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:55,170 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-20 13:35:55,182 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:55,183 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1827219833] [2020-07-20 13:35:55,183 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:55,296 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:55,297 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:55,305 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:35:55,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:55,475 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:35:55,476 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:35:55,477 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1827219833] [2020-07-20 13:35:55,479 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:35:55,480 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:35:55,481 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726820124] [2020-07-20 13:35:55,488 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:35:55,489 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:55,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:35:55,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:35:55,520 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-20 13:35:55,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:55,651 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-07-20 13:35:55,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:35:55,654 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 13:35:55,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:55,667 INFO L225 Difference]: With dead ends: 30 [2020-07-20 13:35:55,668 INFO L226 Difference]: Without dead ends: 18 [2020-07-20 13:35:55,673 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 13:35:55,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-20 13:35:55,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-20 13:35:55,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 13:35:55,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-20 13:35:55,737 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-20 13:35:55,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:55,738 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-20 13:35:55,738 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:35:55,741 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-20 13:35:55,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 13:35:55,744 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:55,745 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:55,947 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:55,948 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:55,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:55,949 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-20 13:35:55,950 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:55,951 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1160514883] [2020-07-20 13:35:55,951 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:55,993 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:55,994 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:55,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:35:55,998 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:56,084 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 13:35:56,085 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:56,350 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:56,356 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:56,413 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 13:35:56,414 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1160514883] [2020-07-20 13:35:56,414 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:56,414 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 13:35:56,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094580598] [2020-07-20 13:35:56,417 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 13:35:56,418 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:56,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 13:35:56,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 13:35:56,419 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 9 states. [2020-07-20 13:35:56,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:56,523 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-07-20 13:35:56,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 13:35:56,524 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-07-20 13:35:56,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:56,526 INFO L225 Difference]: With dead ends: 25 [2020-07-20 13:35:56,526 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 13:35:56,528 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 26 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:35:56,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 13:35:56,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 13:35:56,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 13:35:56,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-07-20 13:35:56,539 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-07-20 13:35:56,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:56,539 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-07-20 13:35:56,539 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 13:35:56,540 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-07-20 13:35:56,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-20 13:35:56,541 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:56,542 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:56,756 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:56,757 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:56,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:56,758 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2020-07-20 13:35:56,759 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:56,759 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1013797184] [2020-07-20 13:35:56,760 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:56,823 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:56,824 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:56,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:35:56,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:56,909 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-07-20 13:35:56,910 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:57,262 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:57,264 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:57,326 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:57,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:57,375 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 13:35:57,376 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1013797184] [2020-07-20 13:35:57,376 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:57,377 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 13:35:57,377 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478142947] [2020-07-20 13:35:57,378 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 13:35:57,379 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:57,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 13:35:57,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 13:35:57,380 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 11 states. [2020-07-20 13:35:57,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:57,474 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-07-20 13:35:57,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:35:57,475 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 25 [2020-07-20 13:35:57,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:57,477 INFO L225 Difference]: With dead ends: 28 [2020-07-20 13:35:57,477 INFO L226 Difference]: Without dead ends: 24 [2020-07-20 13:35:57,478 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 34 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:35:57,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-20 13:35:57,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-20 13:35:57,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-20 13:35:57,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-20 13:35:57,486 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-07-20 13:35:57,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:57,487 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-20 13:35:57,487 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 13:35:57,487 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-20 13:35:57,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 13:35:57,490 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:57,490 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:57,703 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:57,704 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:57,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:57,705 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2020-07-20 13:35:57,706 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:57,706 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [691911387] [2020-07-20 13:35:57,706 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:57,745 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:57,746 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:57,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:35:57,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:57,832 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 13:35:57,832 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:58,273 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:58,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:58,453 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:58,512 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 13:35:58,513 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [691911387] [2020-07-20 13:35:58,514 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:58,514 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 13:35:58,514 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553133913] [2020-07-20 13:35:58,515 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 13:35:58,515 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:58,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 13:35:58,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 13:35:58,517 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 13 states. [2020-07-20 13:35:58,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:58,619 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-07-20 13:35:58,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:35:58,621 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2020-07-20 13:35:58,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:58,623 INFO L225 Difference]: With dead ends: 31 [2020-07-20 13:35:58,623 INFO L226 Difference]: Without dead ends: 27 [2020-07-20 13:35:58,624 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 42 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:35:58,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-20 13:35:58,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-20 13:35:58,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-20 13:35:58,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-07-20 13:35:58,632 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-07-20 13:35:58,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:58,633 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-07-20 13:35:58,633 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 13:35:58,633 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-07-20 13:35:58,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-20 13:35:58,635 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:58,635 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:58,850 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:58,852 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:58,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:58,852 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2020-07-20 13:35:58,853 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:58,854 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1256572118] [2020-07-20 13:35:58,854 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:58,896 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:58,896 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:58,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:35:58,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:58,975 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-20 13:35:58,976 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:59,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:59,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:59,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:59,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:59,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:59,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:59,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:59,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:00,015 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-07-20 13:36:00,016 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1256572118] [2020-07-20 13:36:00,016 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:00,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 13:36:00,017 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070579498] [2020-07-20 13:36:00,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 13:36:00,018 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:00,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 13:36:00,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:36:00,019 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 15 states. [2020-07-20 13:36:00,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:00,154 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-07-20 13:36:00,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:36:00,160 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-07-20 13:36:00,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:00,161 INFO L225 Difference]: With dead ends: 34 [2020-07-20 13:36:00,162 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 13:36:00,163 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 50 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:36:00,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 13:36:00,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 13:36:00,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 13:36:00,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-07-20 13:36:00,171 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-07-20 13:36:00,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:00,172 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-07-20 13:36:00,172 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 13:36:00,172 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-07-20 13:36:00,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-20 13:36:00,174 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:00,174 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:00,382 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:00,383 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:00,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:00,384 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2020-07-20 13:36:00,384 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:00,385 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1841571035] [2020-07-20 13:36:00,386 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:00,444 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:36:00,445 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:00,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:36:00,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:00,548 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-20 13:36:00,548 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:01,440 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:01,680 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:01,681 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:01,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:01,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:01,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:01,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:01,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:01,995 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:02,063 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 13:36:02,065 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1841571035] [2020-07-20 13:36:02,066 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:02,066 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 13:36:02,067 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176441990] [2020-07-20 13:36:02,069 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 13:36:02,070 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:02,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 13:36:02,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 13:36:02,073 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 17 states. [2020-07-20 13:36:02,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:02,259 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2020-07-20 13:36:02,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:36:02,260 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 43 [2020-07-20 13:36:02,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:02,262 INFO L225 Difference]: With dead ends: 37 [2020-07-20 13:36:02,262 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 13:36:02,263 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 58 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:36:02,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 13:36:02,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-20 13:36:02,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-20 13:36:02,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-07-20 13:36:02,271 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2020-07-20 13:36:02,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:02,272 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-07-20 13:36:02,272 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 13:36:02,272 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-07-20 13:36:02,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-20 13:36:02,274 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:02,275 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:02,489 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:02,491 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:02,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:02,491 INFO L82 PathProgramCache]: Analyzing trace with hash -1590630787, now seen corresponding path program 6 times [2020-07-20 13:36:02,492 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:02,493 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1653135889] [2020-07-20 13:36:02,493 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:02,557 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:36:02,557 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:02,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:36:02,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:02,648 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-07-20 13:36:02,648 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:03,887 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:04,247 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:04,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:04,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:04,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:04,657 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:04,658 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:04,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:04,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:04,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:04,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:04,893 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-20 13:36:04,894 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1653135889] [2020-07-20 13:36:04,894 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:04,894 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 13:36:04,894 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2061794564] [2020-07-20 13:36:04,895 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 13:36:04,895 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:04,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 13:36:04,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 13:36:04,897 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 19 states. [2020-07-20 13:36:05,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:05,092 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2020-07-20 13:36:05,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:36:05,093 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 49 [2020-07-20 13:36:05,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:05,094 INFO L225 Difference]: With dead ends: 40 [2020-07-20 13:36:05,095 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 13:36:05,096 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 66 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:36:05,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 13:36:05,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-20 13:36:05,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 13:36:05,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-20 13:36:05,103 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2020-07-20 13:36:05,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:05,104 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-20 13:36:05,104 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 13:36:05,104 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-20 13:36:05,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-20 13:36:05,106 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:05,106 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:05,316 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:05,317 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:05,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:05,318 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 7 times [2020-07-20 13:36:05,318 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:05,319 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [159760661] [2020-07-20 13:36:05,319 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:05,394 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:36:05,395 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:05,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:36:05,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:05,513 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-20 13:36:05,513 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:07,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:07,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:07,776 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:07,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:08,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:08,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:08,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:08,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:08,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:08,600 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:08,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:08,711 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-20 13:36:08,712 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [159760661] [2020-07-20 13:36:08,712 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:08,712 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 13:36:08,713 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1590821189] [2020-07-20 13:36:08,713 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 13:36:08,714 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:08,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 13:36:08,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:36:08,715 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 21 states. [2020-07-20 13:36:08,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:08,950 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2020-07-20 13:36:08,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:36:08,951 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 55 [2020-07-20 13:36:08,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:08,952 INFO L225 Difference]: With dead ends: 43 [2020-07-20 13:36:08,952 INFO L226 Difference]: Without dead ends: 39 [2020-07-20 13:36:08,954 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 74 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:36:08,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-20 13:36:08,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-07-20 13:36:08,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-20 13:36:08,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-07-20 13:36:08,962 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2020-07-20 13:36:08,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:08,963 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-07-20 13:36:08,963 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 13:36:08,963 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-07-20 13:36:08,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-20 13:36:08,965 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:08,965 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:09,174 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:09,176 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:09,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:09,176 INFO L82 PathProgramCache]: Analyzing trace with hash 1140618237, now seen corresponding path program 8 times [2020-07-20 13:36:09,177 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:09,177 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1172271690] [2020-07-20 13:36:09,178 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:09,308 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:36:09,309 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:09,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:36:09,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:09,449 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-20 13:36:09,449 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:11,736 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:12,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:13,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:13,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:13,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:13,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:13,822 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:13,927 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:13,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:13,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:13,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:14,077 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-07-20 13:36:14,078 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1172271690] [2020-07-20 13:36:14,079 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:14,079 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 13:36:14,079 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [578514725] [2020-07-20 13:36:14,082 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 13:36:14,084 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:14,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 13:36:14,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 13:36:14,085 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 23 states. [2020-07-20 13:36:14,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:14,346 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2020-07-20 13:36:14,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:36:14,347 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 61 [2020-07-20 13:36:14,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:14,349 INFO L225 Difference]: With dead ends: 46 [2020-07-20 13:36:14,349 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 13:36:14,351 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 82 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:36:14,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 13:36:14,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-07-20 13:36:14,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-20 13:36:14,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-07-20 13:36:14,360 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2020-07-20 13:36:14,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:14,360 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-07-20 13:36:14,361 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 13:36:14,361 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-07-20 13:36:14,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-20 13:36:14,362 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:14,362 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:14,569 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:14,571 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:14,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:14,571 INFO L82 PathProgramCache]: Analyzing trace with hash -1749177617, now seen corresponding path program 9 times [2020-07-20 13:36:14,572 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:14,572 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1064221233] [2020-07-20 13:36:14,573 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:14,717 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:36:14,718 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:14,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 13:36:14,723 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:14,848 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-07-20 13:36:14,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:17,969 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:17,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:19,025 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:19,026 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:19,818 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:19,819 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:20,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:20,393 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:20,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:20,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:21,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:21,177 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:21,277 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:21,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:21,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:21,401 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-07-20 13:36:21,401 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1064221233] [2020-07-20 13:36:21,402 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:21,402 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 13:36:21,402 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [27661838] [2020-07-20 13:36:21,403 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 13:36:21,403 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:21,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 13:36:21,405 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 13:36:21,406 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 25 states. [2020-07-20 13:36:21,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:21,672 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-07-20 13:36:21,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:36:21,673 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 67 [2020-07-20 13:36:21,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:21,675 INFO L225 Difference]: With dead ends: 49 [2020-07-20 13:36:21,675 INFO L226 Difference]: Without dead ends: 45 [2020-07-20 13:36:21,677 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 90 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 13:36:21,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-20 13:36:21,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-07-20 13:36:21,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 13:36:21,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-07-20 13:36:21,684 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2020-07-20 13:36:21,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:21,685 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-07-20 13:36:21,685 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 13:36:21,685 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-07-20 13:36:21,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-07-20 13:36:21,687 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:21,688 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:21,898 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:21,900 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:21,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:21,901 INFO L82 PathProgramCache]: Analyzing trace with hash -1580609155, now seen corresponding path program 10 times [2020-07-20 13:36:21,901 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:21,902 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1111484062] [2020-07-20 13:36:21,902 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:22,111 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:36:22,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:22,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 13:36:22,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:22,278 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2020-07-20 13:36:22,278 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:26,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:26,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:27,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:27,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:28,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:28,929 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:29,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:30,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:30,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:30,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:31,136 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:31,137 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:31,314 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:31,432 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:31,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:31,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:31,585 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 255 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2020-07-20 13:36:31,585 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1111484062] [2020-07-20 13:36:31,586 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:31,586 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 13:36:31,586 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1974634773] [2020-07-20 13:36:31,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 13:36:31,588 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:31,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 13:36:31,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 13:36:31,589 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 27 states. [2020-07-20 13:36:31,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:31,987 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2020-07-20 13:36:31,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 13:36:31,989 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 73 [2020-07-20 13:36:31,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:31,991 INFO L225 Difference]: With dead ends: 52 [2020-07-20 13:36:31,992 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 13:36:31,995 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 98 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 13:36:31,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 13:36:32,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-07-20 13:36:32,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-20 13:36:32,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2020-07-20 13:36:32,020 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2020-07-20 13:36:32,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:32,021 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2020-07-20 13:36:32,021 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 13:36:32,021 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2020-07-20 13:36:32,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-07-20 13:36:32,029 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:32,029 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:32,244 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:32,245 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:32,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:32,246 INFO L82 PathProgramCache]: Analyzing trace with hash -223837457, now seen corresponding path program 11 times [2020-07-20 13:36:32,247 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:32,247 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [869907117] [2020-07-20 13:36:32,247 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:32,665 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:36:32,665 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:32,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 13:36:32,675 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:32,929 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2020-07-20 13:36:32,929 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:38,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:38,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:40,312 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:40,313 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:41,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:41,986 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:43,277 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:43,278 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:44,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:45,097 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:45,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:45,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:45,872 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:45,873 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:46,089 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:46,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:46,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:46,295 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:46,296 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:46,379 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 308 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-20 13:36:46,380 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [869907117] [2020-07-20 13:36:46,380 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:46,380 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 13:36:46,380 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237695071] [2020-07-20 13:36:46,381 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 13:36:46,381 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:46,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 13:36:46,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 13:36:46,382 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 29 states. [2020-07-20 13:36:46,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:46,900 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2020-07-20 13:36:46,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 13:36:46,901 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 79 [2020-07-20 13:36:46,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:46,903 INFO L225 Difference]: With dead ends: 55 [2020-07-20 13:36:46,903 INFO L226 Difference]: Without dead ends: 51 [2020-07-20 13:36:46,905 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 106 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 13:36:46,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-07-20 13:36:46,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-07-20 13:36:46,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 13:36:46,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2020-07-20 13:36:46,913 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 79 [2020-07-20 13:36:46,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:46,914 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2020-07-20 13:36:46,914 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 13:36:46,914 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2020-07-20 13:36:46,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-07-20 13:36:46,915 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:46,916 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:47,128 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:47,129 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:47,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:47,130 INFO L82 PathProgramCache]: Analyzing trace with hash 1653931773, now seen corresponding path program 12 times [2020-07-20 13:36:47,131 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:47,131 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1293717736] [2020-07-20 13:36:47,132 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:36:47,464 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:36:47,464 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:47,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 13:36:47,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:47,762 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-07-20 13:36:47,762 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:49,893 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 13:36:49,998 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 13:36:50,305 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 13:36:50,410 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 13:36:50,526 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-20 13:36:50,898 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-20 13:36:53,826 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 13:36:54,114 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-20 13:36:54,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:54,815 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:57,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:57,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:59,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:59,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:01,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:02,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:04,024 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:04,025 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:04,791 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:05,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:05,895 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:05,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:06,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:06,209 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:06,363 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:06,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:06,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:06,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:06,566 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 366 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-20 13:37:06,567 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1293717736] [2020-07-20 13:37:06,567 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:37:06,567 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 29] total 31 [2020-07-20 13:37:06,567 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593304688] [2020-07-20 13:37:06,568 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 13:37:06,568 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:37:06,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 13:37:06,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2020-07-20 13:37:06,570 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 31 states. [2020-07-20 13:37:07,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:37:07,151 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2020-07-20 13:37:07,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 13:37:07,152 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 85 [2020-07-20 13:37:07,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:37:07,154 INFO L225 Difference]: With dead ends: 58 [2020-07-20 13:37:07,154 INFO L226 Difference]: Without dead ends: 54 [2020-07-20 13:37:07,155 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 114 SyntacticMatches, 26 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=619, Invalid=1273, Unknown=0, NotChecked=0, Total=1892 [2020-07-20 13:37:07,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-20 13:37:07,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-07-20 13:37:07,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-20 13:37:07,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2020-07-20 13:37:07,163 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 85 [2020-07-20 13:37:07,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:37:07,164 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2020-07-20 13:37:07,164 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 13:37:07,164 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2020-07-20 13:37:07,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-07-20 13:37:07,166 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:37:07,166 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:37:07,368 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:07,368 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:37:07,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:37:07,369 INFO L82 PathProgramCache]: Analyzing trace with hash -218674449, now seen corresponding path program 13 times [2020-07-20 13:37:07,369 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:37:07,370 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1429046185] [2020-07-20 13:37:07,370 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:37:07,809 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:37:07,810 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:37:07,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-20 13:37:07,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:37:08,206 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2020-07-20 13:37:08,206 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:37:10,657 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 13:37:10,860 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 13:37:10,966 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 13:37:11,075 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-20 13:37:11,189 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-20 13:37:11,313 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-20 13:37:11,436 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-20 13:37:11,556 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2020-07-20 13:37:11,695 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 96 [2020-07-20 13:37:11,809 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 93 [2020-07-20 13:37:11,916 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2020-07-20 13:37:12,018 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-20 13:37:15,279 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-20 13:37:15,385 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-20 13:37:15,496 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 13:37:15,604 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 13:37:15,749 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 13:37:15,863 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 13:37:15,985 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 13:37:16,107 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 13:37:16,226 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 93 [2020-07-20 13:37:16,337 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 90 [2020-07-20 13:37:16,443 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2020-07-20 13:37:16,547 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 13:37:17,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:19,635 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 13:37:19,737 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 13:37:19,843 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-20 13:37:19,970 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-20 13:37:20,088 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 13:37:20,196 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 13:37:20,309 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2020-07-20 13:37:20,412 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2020-07-20 13:37:21,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:21,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:23,583 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 13:37:23,687 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 13:37:23,797 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-20 13:37:24,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:24,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:27,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:29,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:31,729 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:31,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:33,159 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:33,160 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:34,160 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:34,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:34,851 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:34,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:35,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:35,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:35,657 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:35,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:35,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:35,995 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:36,138 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2020-07-20 13:37:36,139 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1429046185] [2020-07-20 13:37:36,139 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:37:36,139 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 31] total 33 [2020-07-20 13:37:36,140 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1005957445] [2020-07-20 13:37:36,140 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-20 13:37:36,141 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:37:36,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-20 13:37:36,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=274, Invalid=782, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 13:37:36,142 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 33 states. [2020-07-20 13:37:37,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:37:37,112 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2020-07-20 13:37:37,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 13:37:37,116 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 91 [2020-07-20 13:37:37,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:37:37,117 INFO L225 Difference]: With dead ends: 61 [2020-07-20 13:37:37,117 INFO L226 Difference]: Without dead ends: 57 [2020-07-20 13:37:37,119 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 122 SyntacticMatches, 28 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 574 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=708, Invalid=1454, Unknown=0, NotChecked=0, Total=2162 [2020-07-20 13:37:37,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-20 13:37:37,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-07-20 13:37:37,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-20 13:37:37,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2020-07-20 13:37:37,126 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 91 [2020-07-20 13:37:37,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:37:37,126 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2020-07-20 13:37:37,126 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-20 13:37:37,127 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2020-07-20 13:37:37,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-07-20 13:37:37,128 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:37:37,128 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:37:37,331 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:37,332 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:37:37,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:37:37,333 INFO L82 PathProgramCache]: Analyzing trace with hash 492436605, now seen corresponding path program 14 times [2020-07-20 13:37:37,334 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:37:37,334 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [445901747] [2020-07-20 13:37:37,334 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:37:37,909 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:37:37,909 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:37:37,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-20 13:37:37,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:37:38,499 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2020-07-20 13:37:38,499 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:37:40,500 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 13:37:40,704 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 13:37:40,811 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 13:37:40,927 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 13:37:41,039 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 13:37:41,161 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-20 13:37:41,278 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-20 13:37:41,400 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 13:37:41,526 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 13:37:41,665 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 13:37:41,799 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 13:37:41,935 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 13:37:42,077 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 13:37:42,221 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-20 13:37:42,365 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-20 13:37:42,514 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 13:37:42,668 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 13:37:42,837 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-20 13:37:43,000 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-20 13:37:43,170 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-20 13:37:43,338 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-20 13:37:43,507 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2020-07-20 13:37:43,665 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 103 [2020-07-20 13:37:43,831 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2020-07-20 13:37:43,977 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 96 [2020-07-20 13:37:44,103 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 93 [2020-07-20 13:37:44,231 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2020-07-20 13:37:44,348 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2020-07-20 13:37:44,462 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 13:37:44,576 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 13:37:44,683 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-20 13:37:44,788 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 13:37:47,558 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 13:37:47,668 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 13:37:47,783 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 13:37:47,891 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 13:37:48,015 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 13:37:48,131 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 13:37:48,248 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 13:37:48,361 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 13:37:48,484 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-20 13:37:48,603 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-20 13:37:48,729 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 13:37:48,859 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 13:37:48,992 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 13:37:49,159 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 13:37:49,303 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 13:37:49,456 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 13:37:49,625 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-20 13:37:49,791 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-20 13:37:49,947 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 13:37:50,106 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 13:37:50,270 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2020-07-20 13:37:50,422 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-20 13:37:50,569 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 93 [2020-07-20 13:37:50,711 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-20 13:37:50,838 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-20 13:37:50,961 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-20 13:37:51,083 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-20 13:37:51,199 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2020-07-20 13:37:51,307 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 13:37:52,148 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:52,149 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:54,063 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 13:37:54,169 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 13:37:54,277 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 13:37:54,385 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 13:37:54,491 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 13:37:54,601 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 13:37:54,722 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 13:37:54,843 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 13:37:54,988 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 13:37:55,105 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 13:37:55,234 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-20 13:37:55,351 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-20 13:37:55,478 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 13:37:55,600 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 13:37:55,732 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 13:37:55,874 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 13:37:56,029 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 13:37:56,171 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 13:37:56,303 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 93 [2020-07-20 13:37:56,436 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 90 [2020-07-20 13:37:56,573 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2020-07-20 13:37:56,692 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2020-07-20 13:37:56,798 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-20 13:37:56,905 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2020-07-20 13:37:57,020 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-20 13:37:57,132 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 13:37:57,237 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 13:37:57,856 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:57,856 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:59,921 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 13:38:00,034 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 13:38:00,158 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 13:38:00,277 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 13:38:00,404 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 13:38:00,535 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 13:38:00,697 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 13:38:00,835 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 13:38:00,974 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-20 13:38:01,093 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-20 13:38:01,221 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 13:38:01,341 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 13:38:01,454 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2020-07-20 13:38:01,571 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2020-07-20 13:38:01,702 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-20 13:38:01,830 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2020-07-20 13:38:01,949 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-20 13:38:02,055 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 13:38:02,158 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:38:02,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:02,870 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:05,039 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 13:38:05,246 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 13:38:05,355 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 13:38:05,471 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 13:38:05,583 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 13:38:05,706 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 13:38:05,812 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 13:38:05,958 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-20 13:38:06,070 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2020-07-20 13:38:06,175 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-20 13:38:07,073 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:07,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:08,959 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 13:38:09,071 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 13:38:09,190 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 13:38:09,304 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 13:38:09,428 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 13:38:09,555 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 13:38:09,684 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 13:38:09,809 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 13:38:09,935 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-20 13:38:10,050 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 13:38:10,161 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 13:38:10,264 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-20 13:38:10,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:10,903 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:12,750 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 13:38:12,862 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 13:38:12,972 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 13:38:13,091 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 13:38:13,212 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 13:38:13,323 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 13:38:13,426 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-20 13:38:14,070 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:14,071 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:15,895 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 13:38:16,005 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 13:38:16,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:18,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:20,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:20,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:21,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:21,062 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:21,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:22,206 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:22,516 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:22,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:22,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:22,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:23,051 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 497 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2020-07-20 13:38:23,052 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [445901747] [2020-07-20 13:38:23,052 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:23,052 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 33] total 34 [2020-07-20 13:38:23,053 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795938119] [2020-07-20 13:38:23,055 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-20 13:38:23,056 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:23,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-20 13:38:23,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=817, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 13:38:23,057 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 34 states. [2020-07-20 13:38:24,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:24,448 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2020-07-20 13:38:24,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-20 13:38:24,452 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 97 [2020-07-20 13:38:24,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:24,453 INFO L225 Difference]: With dead ends: 64 [2020-07-20 13:38:24,453 INFO L226 Difference]: Without dead ends: 60 [2020-07-20 13:38:24,455 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 130 SyntacticMatches, 31 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 616 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=800, Invalid=1552, Unknown=0, NotChecked=0, Total=2352 [2020-07-20 13:38:24,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-20 13:38:24,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-07-20 13:38:24,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 13:38:24,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-07-20 13:38:24,462 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 97 [2020-07-20 13:38:24,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:24,463 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-07-20 13:38:24,463 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-20 13:38:24,463 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-07-20 13:38:24,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-07-20 13:38:24,465 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:24,465 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:24,679 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:24,680 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:24,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:24,681 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 15 times [2020-07-20 13:38:24,681 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:24,682 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [501637126] [2020-07-20 13:38:24,682 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 13:38:25,430 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 13:38:25,431 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 13:38:25,431 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 13:38:25,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 13:38:25,457 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 13:38:25,533 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 13:38:25,533 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 13:38:25,752 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:25,801 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 01:38:25 BoogieIcfgContainer [2020-07-20 13:38:25,801 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 13:38:25,803 INFO L168 Benchmark]: Toolchain (without parser) took 151497.67 ms. Allocated memory was 143.7 MB in the beginning and 551.6 MB in the end (delta: 407.9 MB). Free memory was 102.2 MB in the beginning and 135.6 MB in the end (delta: -33.3 MB). Peak memory consumption was 374.6 MB. Max. memory is 7.1 GB. [2020-07-20 13:38:25,803 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 143.7 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-20 13:38:25,803 INFO L168 Benchmark]: CACSL2BoogieTranslator took 272.27 ms. Allocated memory is still 143.7 MB. Free memory was 101.8 MB in the beginning and 92.2 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-07-20 13:38:25,804 INFO L168 Benchmark]: Boogie Preprocessor took 35.09 ms. Allocated memory is still 143.7 MB. Free memory was 92.2 MB in the beginning and 90.8 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-20 13:38:25,804 INFO L168 Benchmark]: RCFGBuilder took 410.51 ms. Allocated memory was 143.7 MB in the beginning and 202.4 MB in the end (delta: 58.7 MB). Free memory was 90.8 MB in the beginning and 171.0 MB in the end (delta: -80.2 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2020-07-20 13:38:25,805 INFO L168 Benchmark]: TraceAbstraction took 150772.33 ms. Allocated memory was 202.4 MB in the beginning and 551.6 MB in the end (delta: 349.2 MB). Free memory was 170.3 MB in the beginning and 135.6 MB in the end (delta: 34.8 MB). Peak memory consumption was 383.9 MB. Max. memory is 7.1 GB. [2020-07-20 13:38:25,807 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 143.7 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 272.27 ms. Allocated memory is still 143.7 MB. Free memory was 101.8 MB in the beginning and 92.2 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 35.09 ms. Allocated memory is still 143.7 MB. Free memory was 92.2 MB in the beginning and 90.8 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 410.51 ms. Allocated memory was 143.7 MB in the beginning and 202.4 MB in the end (delta: 58.7 MB). Free memory was 90.8 MB in the beginning and 171.0 MB in the end (delta: -80.2 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 150772.33 ms. Allocated memory was 202.4 MB in the beginning and 551.6 MB in the end (delta: 349.2 MB). Free memory was 170.3 MB in the beginning and 135.6 MB in the end (delta: 34.8 MB). Peak memory consumption was 383.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] int input = 15; VAL [input=15] [L11] CALL, EXPR id(input) VAL [\old(x)=15] [L5] COND FALSE !(x==0) VAL [\old(x)=15, x=15] [L6] CALL, EXPR id(x-1) VAL [\old(x)=14] [L5] COND FALSE !(x==0) VAL [\old(x)=14, x=14] [L6] CALL, EXPR id(x-1) VAL [\old(x)=13] [L5] COND FALSE !(x==0) VAL [\old(x)=13, x=13] [L6] CALL, EXPR id(x-1) VAL [\old(x)=12] [L5] COND FALSE !(x==0) VAL [\old(x)=12, x=12] [L6] CALL, EXPR id(x-1) VAL [\old(x)=11] [L5] COND FALSE !(x==0) VAL [\old(x)=11, x=11] [L6] CALL, EXPR id(x-1) VAL [\old(x)=10] [L5] COND FALSE !(x==0) VAL [\old(x)=10, x=10] [L6] CALL, EXPR id(x-1) VAL [\old(x)=9] [L5] COND FALSE !(x==0) VAL [\old(x)=9, x=9] [L6] CALL, EXPR id(x-1) VAL [\old(x)=8] [L5] COND FALSE !(x==0) VAL [\old(x)=8, x=8] [L6] CALL, EXPR id(x-1) VAL [\old(x)=7] [L5] COND FALSE !(x==0) VAL [\old(x)=7, x=7] [L6] CALL, EXPR id(x-1) VAL [\old(x)=6] [L5] COND FALSE !(x==0) VAL [\old(x)=6, x=6] [L6] CALL, EXPR id(x-1) VAL [\old(x)=5] [L5] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L6] CALL, EXPR id(x-1) VAL [\old(x)=4] [L5] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L6] CALL, EXPR id(x-1) VAL [\old(x)=3] [L5] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L6] CALL, EXPR id(x-1) VAL [\old(x)=2] [L5] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L6] CALL, EXPR id(x-1) VAL [\old(x)=1] [L5] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L6] CALL, EXPR id(x-1) VAL [\old(x)=0] [L5] COND TRUE x==0 [L5] return 0; VAL [\old(x)=0, \result=0, x=0] [L6] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=3, id(x-1)=2, x=3] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=5, id(x-1)=4, x=5] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=6, id(x-1)=5, x=6] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=7, id(x-1)=6, x=7] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=8, id(x-1)=7, x=8] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=9, id(x-1)=8, x=9] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=10, id(x-1)=9, x=10] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=11, id(x-1)=10, x=11] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=12, id(x-1)=11, x=12] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=13, id(x-1)=12, x=13] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=14, id(x-1)=13, x=14] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=15, id(x-1)=14, x=15] [L6] return id(x-1) + 1; [L11] RET, EXPR id(input) VAL [id(input)=15, input=15] [L11] int result = id(input); [L12] COND TRUE result == 15 VAL [input=15, result=15] [L13] __VERIFIER_error() VAL [input=15, result=15] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 150.6s, OverallIterations: 16, TraceHistogramMax: 16, AutomataDifference: 5.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 199 SDtfs, 1544 SDslu, 1546 SDs, 0 SdLazy, 766 SolverSat, 654 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1742 GetRequests, 1101 SyntacticMatches, 239 SemanticMatches, 402 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3554 ImplicationChecksByTransitivity, 12.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=60occurred in iteration=15, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 15 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 137.5s InterpolantComputationTime, 928 NumberOfCodeBlocks, 745 NumberOfCodeBlocksAsserted, 49 NumberOfCheckSat, 1608 ConstructedInterpolants, 0 QuantifiedInterpolants, 329352 SizeOfPredicates, 135 NumberOfNonLiveVariables, 1673 ConjunctsInSsa, 270 ConjunctsInUnsatCore, 29 InterpolantComputations, 1 PerfectInterpolantSequences, 2135/6300 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...