/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 DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 21:22:43,909 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 21:22:43,912 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 21:22:43,932 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-07-20 21:22:43,955 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 21:22:43,956 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 21:22:43,959 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 21:22:43,960 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 21:22:43,961 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 21:22:43,963 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 21:22:43,964 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 21:22:43,968 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 21:22:43,973 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 21:22:43,976 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 21:22:43,977 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 21:22:43,978 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 21:22:43,980 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 21:22:43,991 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 21:22:44,017 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 21:22:44,018 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 21:22:44,020 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 21:22:44,020 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 21:22:44,020 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 21:22:44,020 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 21:22:44,020 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 21:22:44,021 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 21:22:44,021 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 21:22:44,021 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 21:22:44,022 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 21:22:44,022 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 21:22:44,022 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 21:22:44,023 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 21:22:44,023 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 21:22:44,023 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 21:22:44,023 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 21:22:44,023 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 21:22:44,024 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 21:22:44,024 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 21:22:44,024 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 21:22:44,024 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:22:44,024 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 21:22:44,025 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 21:22:44,025 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 21:22:44,025 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 21:22:44,025 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:44,025 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 21:22:44,025 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 21:22:44,026 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 -> DAGSIZE 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 21:22:44,320 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 21:22:44,340 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 21:22:44,343 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 21:22:44,344 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 21:22:44,345 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 21:22:44,346 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_25-2.c [2020-07-20 21:22:44,415 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3b8cb8be4/a527c9aa95d84d0fa1a561c8e025f9f3/FLAGedaec656e [2020-07-20 21:22:44,836 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 21:22:44,837 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_25-2.c [2020-07-20 21:22:44,843 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3b8cb8be4/a527c9aa95d84d0fa1a561c8e025f9f3/FLAGedaec656e [2020-07-20 21:22:45,232 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3b8cb8be4/a527c9aa95d84d0fa1a561c8e025f9f3 [2020-07-20 21:22:45,245 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 21:22:45,249 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 21:22:45,254 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 21:22:45,254 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 21:22:45,258 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 21:22:45,259 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:22:45" (1/1) ... [2020-07-20 21:22:45,261 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@78b61bea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:45, skipping insertion in model container [2020-07-20 21:22:45,262 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:22:45" (1/1) ... [2020-07-20 21:22:45,270 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 21:22:45,289 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 21:22:45,478 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:22:45,482 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 21:22:45,497 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:22:45,512 INFO L208 MainTranslator]: Completed translation [2020-07-20 21:22:45,512 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:45 WrapperNode [2020-07-20 21:22:45,512 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 21:22:45,513 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 21:22:45,513 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 21:22:45,513 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 21:22:45,527 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:45" (1/1) ... [2020-07-20 21:22:45,527 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:45" (1/1) ... [2020-07-20 21:22:45,532 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:45" (1/1) ... [2020-07-20 21:22:45,532 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:45" (1/1) ... [2020-07-20 21:22:45,536 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:45" (1/1) ... [2020-07-20 21:22:45,538 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:45" (1/1) ... [2020-07-20 21:22:45,539 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:45" (1/1) ... [2020-07-20 21:22:45,540 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 21:22:45,540 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 21:22:45,541 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 21:22:45,541 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 21:22:45,542 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:45" (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 21:22:45,680 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 21:22:45,681 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 21:22:45,681 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-20 21:22:45,681 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 21:22:45,681 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 21:22:45,681 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 21:22:45,681 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-20 21:22:45,682 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 21:22:45,682 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 21:22:45,682 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 21:22:45,854 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 21:22:45,854 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 21:22:45,858 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:22:45 BoogieIcfgContainer [2020-07-20 21:22:45,859 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 21:22:45,860 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 21:22:45,860 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 21:22:45,863 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 21:22:45,863 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 09:22:45" (1/3) ... [2020-07-20 21:22:45,864 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12ee2dbe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:22:45, skipping insertion in model container [2020-07-20 21:22:45,864 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:45" (2/3) ... [2020-07-20 21:22:45,865 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@12ee2dbe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:22:45, skipping insertion in model container [2020-07-20 21:22:45,865 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:22:45" (3/3) ... [2020-07-20 21:22:45,867 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_25-2.c [2020-07-20 21:22:45,877 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 21:22:45,884 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 21:22:45,900 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 21:22:45,954 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 21:22:45,957 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 21:22:45,957 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 21:22:45,958 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 21:22:45,958 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 21:22:45,958 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 21:22:45,958 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 21:22:45,958 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 21:22:45,977 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-20 21:22:45,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 21:22:45,993 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:45,993 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:45,994 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:46,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:46,002 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-20 21:22:46,008 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:46,009 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [10093522] [2020-07-20 21:22:46,009 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 21:22:46,076 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:22:46,077 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:46,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:22:46,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:46,158 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 21:22:46,158 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:22:46,159 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [10093522] [2020-07-20 21:22:46,160 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:22:46,160 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:22:46,162 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759098590] [2020-07-20 21:22:46,166 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:22:46,166 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:46,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:22:46,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:22:46,179 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-20 21:22:46,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:46,279 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 21:22:46,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:22:46,281 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 21:22:46,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:46,291 INFO L225 Difference]: With dead ends: 35 [2020-07-20 21:22:46,291 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 21:22:46,295 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 21:22:46,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 21:22:46,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 21:22:46,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 21:22:46,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 21:22:46,339 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-20 21:22:46,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:46,340 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 21:22:46,340 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:22:46,340 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 21:22:46,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 21:22:46,342 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:46,342 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:46,556 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:46,556 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:46,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:46,557 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-20 21:22:46,558 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:46,559 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1431674466] [2020-07-20 21:22:46,559 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 21:22:46,585 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:22:46,586 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:46,586 INFO L263 TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:22:46,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:46,623 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 21:22:46,623 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:22:46,624 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1431674466] [2020-07-20 21:22:46,624 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:22:46,625 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:22:46,625 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1318365247] [2020-07-20 21:22:46,628 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:22:46,628 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:46,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:22:46,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:22:46,630 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-20 21:22:46,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:46,715 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-20 21:22:46,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:22:46,717 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 21:22:46,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:46,719 INFO L225 Difference]: With dead ends: 27 [2020-07-20 21:22:46,719 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 21:22:46,720 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 21:22:46,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 21:22:46,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-20 21:22:46,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 21:22:46,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 21:22:46,733 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-20 21:22:46,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:46,734 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 21:22:46,734 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:22:46,735 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 21:22:46,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 21:22:46,739 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:46,739 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:46,953 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:46,954 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:46,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:46,956 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-20 21:22:46,956 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:46,957 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [613620136] [2020-07-20 21:22:46,957 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 21:22:46,992 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:22:46,993 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:46,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:22:46,998 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:47,053 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 21:22:47,053 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:47,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:47,301 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 21:22:47,302 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [613620136] [2020-07-20 21:22:47,302 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:47,302 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 21:22:47,303 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489724648] [2020-07-20 21:22:47,303 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 21:22:47,304 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:47,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 21:22:47,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 21:22:47,305 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-20 21:22:47,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:47,413 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-20 21:22:47,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 21:22:47,413 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-20 21:22:47,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:47,415 INFO L225 Difference]: With dead ends: 32 [2020-07-20 21:22:47,415 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 21:22:47,416 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:22:47,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 21:22:47,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-20 21:22:47,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 21:22:47,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 21:22:47,425 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-20 21:22:47,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:47,425 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 21:22:47,426 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 21:22:47,426 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 21:22:47,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 21:22:47,427 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:47,427 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:47,640 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:47,641 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:47,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:47,642 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-20 21:22:47,643 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:47,643 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [519969671] [2020-07-20 21:22:47,644 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 21:22:47,674 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:47,674 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:47,675 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:22:47,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:47,734 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 21:22:47,734 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:47,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:47,921 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 21:22:47,922 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [519969671] [2020-07-20 21:22:47,922 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:47,922 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 21:22:47,923 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567983373] [2020-07-20 21:22:47,923 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 21:22:47,924 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:47,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 21:22:47,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 21:22:47,925 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-20 21:22:48,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:48,022 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-20 21:22:48,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 21:22:48,023 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 21:22:48,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:48,025 INFO L225 Difference]: With dead ends: 37 [2020-07-20 21:22:48,025 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 21:22:48,026 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 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 21:22:48,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 21:22:48,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-20 21:22:48,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 21:22:48,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 21:22:48,034 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-20 21:22:48,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:48,035 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 21:22:48,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 21:22:48,035 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 21:22:48,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 21:22:48,037 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:48,037 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:48,252 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:48,253 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:48,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:48,254 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-20 21:22:48,255 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:48,255 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1406951159] [2020-07-20 21:22:48,256 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 21:22:48,291 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:48,291 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:48,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:22:48,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:48,353 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 21:22:48,354 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:48,589 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:48,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:48,644 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:48,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:48,686 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 21:22:48,686 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1406951159] [2020-07-20 21:22:48,687 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:48,687 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 21:22:48,687 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1933044998] [2020-07-20 21:22:48,688 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 21:22:48,688 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:48,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 21:22:48,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:22:48,689 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-20 21:22:48,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:48,843 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-20 21:22:48,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 21:22:48,843 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-20 21:22:48,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:48,845 INFO L225 Difference]: With dead ends: 42 [2020-07-20 21:22:48,845 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 21:22:48,846 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:22:48,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 21:22:48,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-20 21:22:48,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 21:22:48,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 21:22:48,856 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-20 21:22:48,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:48,857 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 21:22:48,857 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 21:22:48,857 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 21:22:48,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 21:22:48,859 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:48,859 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:49,068 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:49,069 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:49,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:49,070 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-20 21:22:49,070 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:49,070 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1906671876] [2020-07-20 21:22:49,070 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 21:22:49,112 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:49,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:49,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:22:49,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:49,156 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-20 21:22:49,156 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:49,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:49,416 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:49,422 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:49,461 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 21:22:49,462 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1906671876] [2020-07-20 21:22:49,462 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:49,462 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 21:22:49,462 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [9100446] [2020-07-20 21:22:49,463 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 21:22:49,463 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:49,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 21:22:49,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:22:49,464 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-20 21:22:49,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:49,598 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-20 21:22:49,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 21:22:49,599 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 21:22:49,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:49,605 INFO L225 Difference]: With dead ends: 47 [2020-07-20 21:22:49,606 INFO L226 Difference]: Without dead ends: 43 [2020-07-20 21:22:49,606 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:22:49,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-20 21:22:49,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-20 21:22:49,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 21:22:49,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 21:22:49,627 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-20 21:22:49,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:49,628 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 21:22:49,628 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 21:22:49,628 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 21:22:49,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-20 21:22:49,634 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:49,634 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:49,835 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:49,836 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:49,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:49,837 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-20 21:22:49,838 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:49,838 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1930758247] [2020-07-20 21:22:49,838 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 21:22:49,875 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:49,876 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:49,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:22:49,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:49,929 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-20 21:22:49,929 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:50,314 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:50,400 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:50,401 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:50,441 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:50,442 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:50,485 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-20 21:22:50,485 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1930758247] [2020-07-20 21:22:50,485 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:50,486 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 21:22:50,486 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494947093] [2020-07-20 21:22:50,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:22:50,487 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:50,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:22:50,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:22:50,487 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-20 21:22:50,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:50,644 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-20 21:22:50,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:22:50,645 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-20 21:22:50,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:50,647 INFO L225 Difference]: With dead ends: 52 [2020-07-20 21:22:50,647 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 21:22:50,648 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:22:50,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 21:22:50,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-20 21:22:50,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 21:22:50,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 21:22:50,665 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-20 21:22:50,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:50,666 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 21:22:50,666 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:22:50,666 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 21:22:50,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-20 21:22:50,668 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:50,668 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:50,876 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:50,877 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:50,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:50,878 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-20 21:22:50,878 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:50,879 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1017124269] [2020-07-20 21:22:50,879 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 21:22:50,931 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:50,932 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:50,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:22:50,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:50,984 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-20 21:22:50,984 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:51,388 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:51,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:51,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:51,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:51,570 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-20 21:22:51,570 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1017124269] [2020-07-20 21:22:51,571 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:51,571 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 21:22:51,571 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2048379639] [2020-07-20 21:22:51,572 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:22:51,572 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:51,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:22:51,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:22:51,573 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-20 21:22:51,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:51,709 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-20 21:22:51,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:22:51,711 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-20 21:22:51,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:51,713 INFO L225 Difference]: With dead ends: 57 [2020-07-20 21:22:51,713 INFO L226 Difference]: Without dead ends: 53 [2020-07-20 21:22:51,714 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:22:51,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-20 21:22:51,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-20 21:22:51,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 21:22:51,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 21:22:51,727 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-20 21:22:51,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:51,727 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 21:22:51,728 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:22:51,728 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 21:22:51,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 21:22:51,732 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:51,732 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:51,948 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:51,948 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:51,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:51,949 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-20 21:22:51,950 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:51,951 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [287069490] [2020-07-20 21:22:51,951 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 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 21:22:52,011 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:52,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:52,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:22:52,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:52,107 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-20 21:22:52,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:52,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:52,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:52,863 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:52,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:53,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:53,045 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-20 21:22:53,045 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [287069490] [2020-07-20 21:22:53,045 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:53,046 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 21:22:53,046 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140560671] [2020-07-20 21:22:53,047 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:22:53,047 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:53,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:22:53,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:22:53,047 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-20 21:22:53,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:53,329 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-20 21:22:53,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:22:53,330 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-20 21:22:53,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:53,332 INFO L225 Difference]: With dead ends: 62 [2020-07-20 21:22:53,332 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 21:22:53,333 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:22:53,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 21:22:53,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-20 21:22:53,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 21:22:53,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 21:22:53,345 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-20 21:22:53,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:53,345 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 21:22:53,345 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:22:53,346 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 21:22:53,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-20 21:22:53,348 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:53,348 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:53,556 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:53,558 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:53,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:53,558 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-20 21:22:53,559 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:53,559 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1402954888] [2020-07-20 21:22:53,560 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 21:22:53,643 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:53,643 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:53,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:22:53,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:53,745 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-20 21:22:53,746 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:54,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:54,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:54,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:54,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:54,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:54,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:54,844 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-20 21:22:54,844 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1402954888] [2020-07-20 21:22:54,844 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:54,844 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 21:22:54,844 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [274467996] [2020-07-20 21:22:54,845 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:22:54,845 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:54,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:22:54,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:22:54,846 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-20 21:22:55,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:55,013 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-20 21:22:55,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:22:55,014 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-20 21:22:55,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:55,019 INFO L225 Difference]: With dead ends: 67 [2020-07-20 21:22:55,019 INFO L226 Difference]: Without dead ends: 63 [2020-07-20 21:22:55,020 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:22:55,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-20 21:22:55,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-20 21:22:55,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 21:22:55,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 21:22:55,043 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-20 21:22:55,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:55,047 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 21:22:55,047 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:22:55,047 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 21:22:55,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-20 21:22:55,050 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:55,050 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:55,266 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:55,267 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:55,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:55,267 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-20 21:22:55,267 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:55,268 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [899274534] [2020-07-20 21:22:55,268 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 21:22:55,393 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:55,393 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:55,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 543 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 21:22:55,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:55,486 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-20 21:22:55,486 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:56,629 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:56,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:57,098 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:57,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:57,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:57,223 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:57,312 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-20 21:22:57,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [899274534] [2020-07-20 21:22:57,313 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:57,313 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 21:22:57,313 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1004496680] [2020-07-20 21:22:57,314 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 21:22:57,314 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:57,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 21:22:57,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:22:57,315 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-20 21:22:57,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:57,531 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-20 21:22:57,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:22:57,536 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-20 21:22:57,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:57,539 INFO L225 Difference]: With dead ends: 72 [2020-07-20 21:22:57,539 INFO L226 Difference]: Without dead ends: 68 [2020-07-20 21:22:57,540 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:22:57,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-20 21:22:57,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-20 21:22:57,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 21:22:57,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 21:22:57,551 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-20 21:22:57,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:57,552 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 21:22:57,552 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 21:22:57,552 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 21:22:57,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2020-07-20 21:22:57,557 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:57,557 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 35, 21, 21, 21, 21, 21, 21, 21, 14, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:57,770 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:57,772 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:57,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:57,772 INFO L82 PathProgramCache]: Analyzing trace with hash -1101007572, now seen corresponding path program 5 times [2020-07-20 21:22:57,773 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:57,773 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [270433859] [2020-07-20 21:22:57,774 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 21:22:57,893 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:57,894 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:57,895 INFO L263 TraceCheckSpWp]: Trace formula consists of 561 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 21:22:57,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:58,061 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1061 refuted. 0 times theorem prover too weak. 3827 trivial. 0 not checked. [2020-07-20 21:22:58,061 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:59,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,917 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1101 refuted. 0 times theorem prover too weak. 3787 trivial. 0 not checked. [2020-07-20 21:22:59,917 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [270433859] [2020-07-20 21:22:59,917 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:59,918 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 21:22:59,918 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286156728] [2020-07-20 21:22:59,919 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 21:22:59,919 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:59,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 21:22:59,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:22:59,920 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-20 21:23:00,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:00,136 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-20 21:23:00,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:23:00,136 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 300 [2020-07-20 21:23:00,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:00,143 INFO L225 Difference]: With dead ends: 77 [2020-07-20 21:23:00,143 INFO L226 Difference]: Without dead ends: 73 [2020-07-20 21:23:00,144 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 605 GetRequests, 572 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:23:00,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-20 21:23:00,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-20 21:23:00,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 21:23:00,162 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 21:23:00,162 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 300 [2020-07-20 21:23:00,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:00,164 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 21:23:00,164 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 21:23:00,164 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 21:23:00,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 469 [2020-07-20 21:23:00,173 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:00,174 INFO L422 BasicCegarLoop]: trace histogram [71, 71, 36, 35, 35, 35, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:00,387 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:00,388 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:00,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:00,389 INFO L82 PathProgramCache]: Analyzing trace with hash -897924696, now seen corresponding path program 6 times [2020-07-20 21:23:00,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:00,390 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [968237254] [2020-07-20 21:23:00,390 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 21:23:00,602 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:00,602 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:00,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 883 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 21:23:00,612 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:00,789 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 1995 refuted. 0 times theorem prover too weak. 10614 trivial. 0 not checked. [2020-07-20 21:23:00,790 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:02,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:03,150 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:03,408 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:03,576 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:03,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:03,657 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:03,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:03,711 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:03,851 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 2046 refuted. 0 times theorem prover too weak. 10563 trivial. 0 not checked. [2020-07-20 21:23:03,851 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [968237254] [2020-07-20 21:23:03,851 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:03,852 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 21:23:03,852 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2137331258] [2020-07-20 21:23:03,852 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 21:23:03,853 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:03,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 21:23:03,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:23:03,853 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-20 21:23:04,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:04,174 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-20 21:23:04,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:23:04,175 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 468 [2020-07-20 21:23:04,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:04,181 INFO L225 Difference]: With dead ends: 82 [2020-07-20 21:23:04,182 INFO L226 Difference]: Without dead ends: 78 [2020-07-20 21:23:04,183 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 943 GetRequests, 905 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 21:23:04,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-20 21:23:04,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-20 21:23:04,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 21:23:04,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 21:23:04,206 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 468 [2020-07-20 21:23:04,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:04,208 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 21:23:04,208 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 21:23:04,209 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 21:23:04,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-20 21:23:04,218 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:04,218 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:04,433 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:04,434 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:04,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:04,435 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-20 21:23:04,435 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:04,436 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1357772367] [2020-07-20 21:23:04,436 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 21:23:04,621 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:04,622 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:04,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 844 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 21:23:04,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:04,842 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-20 21:23:04,843 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:06,452 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:07,173 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:07,174 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:07,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:07,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:07,643 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:07,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:07,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:07,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:07,926 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-20 21:23:07,927 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1357772367] [2020-07-20 21:23:07,927 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:07,927 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 21:23:07,927 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589418516] [2020-07-20 21:23:07,928 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 21:23:07,928 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:07,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 21:23:07,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:23:07,929 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-20 21:23:08,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:08,402 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-20 21:23:08,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:23:08,403 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-20 21:23:08,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:08,409 INFO L225 Difference]: With dead ends: 87 [2020-07-20 21:23:08,409 INFO L226 Difference]: Without dead ends: 83 [2020-07-20 21:23:08,411 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 21:23:08,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-20 21:23:08,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-20 21:23:08,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 21:23:08,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 21:23:08,440 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-20 21:23:08,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:08,441 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 21:23:08,441 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 21:23:08,442 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 21:23:08,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 872 [2020-07-20 21:23:08,452 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:08,452 INFO L422 BasicCegarLoop]: trace histogram [133, 133, 67, 66, 66, 66, 66, 66, 66, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:08,665 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:08,666 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:08,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:08,667 INFO L82 PathProgramCache]: Analyzing trace with hash -1701713687, now seen corresponding path program 7 times [2020-07-20 21:23:08,668 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:08,668 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [806611377] [2020-07-20 21:23:08,668 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 21:23:09,014 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:09,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:09,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 1644 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:23:09,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:09,465 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4406 refuted. 0 times theorem prover too weak. 40653 trivial. 0 not checked. [2020-07-20 21:23:09,465 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:12,177 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:12,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:13,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:14,051 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:14,051 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:14,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:14,349 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:14,510 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:14,511 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:14,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:14,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:14,653 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:15,015 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4476 refuted. 0 times theorem prover too weak. 40583 trivial. 0 not checked. [2020-07-20 21:23:15,016 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [806611377] [2020-07-20 21:23:15,016 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:15,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 21:23:15,016 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755291975] [2020-07-20 21:23:15,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:23:15,018 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:15,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:23:15,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:23:15,019 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-20 21:23:15,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:15,386 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-20 21:23:15,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 21:23:15,386 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 871 [2020-07-20 21:23:15,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:15,392 INFO L225 Difference]: With dead ends: 92 [2020-07-20 21:23:15,392 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 21:23:15,395 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1750 GetRequests, 1707 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:23:15,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 21:23:15,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-20 21:23:15,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 21:23:15,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 21:23:15,415 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 871 [2020-07-20 21:23:15,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:15,416 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 21:23:15,416 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:23:15,417 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 21:23:15,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1078 [2020-07-20 21:23:15,427 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:15,428 INFO L422 BasicCegarLoop]: trace histogram [157, 157, 128, 78, 78, 78, 78, 78, 78, 78, 50, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:15,642 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:15,643 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:15,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:15,643 INFO L82 PathProgramCache]: Analyzing trace with hash 860290653, now seen corresponding path program 7 times [2020-07-20 21:23:15,644 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:15,644 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1290367847] [2020-07-20 21:23:15,644 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 21:23:16,027 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:16,027 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:16,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 2016 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:23:16,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:16,618 INFO L134 CoverageAnalysis]: Checked inductivity of 69124 backedges. 831 proven. 5812 refuted. 0 times theorem prover too weak. 62481 trivial. 0 not checked. [2020-07-20 21:23:16,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:19,981 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:19,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:21,175 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:21,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:21,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:22,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:22,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:22,340 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:22,436 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:22,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:23,169 INFO L134 CoverageAnalysis]: Checked inductivity of 69124 backedges. 831 proven. 5889 refuted. 0 times theorem prover too weak. 62404 trivial. 0 not checked. [2020-07-20 21:23:23,169 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1290367847] [2020-07-20 21:23:23,170 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:23,170 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 21:23:23,170 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418674850] [2020-07-20 21:23:23,172 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:23:23,172 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:23,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:23:23,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:23:23,173 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-20 21:23:23,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:23,716 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-20 21:23:23,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 21:23:23,717 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1077 [2020-07-20 21:23:23,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:23,722 INFO L225 Difference]: With dead ends: 97 [2020-07-20 21:23:23,722 INFO L226 Difference]: Without dead ends: 93 [2020-07-20 21:23:23,723 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2161 GetRequests, 2118 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 21:23:23,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-20 21:23:23,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-20 21:23:23,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 21:23:23,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 21:23:23,741 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1077 [2020-07-20 21:23:23,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:23,743 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 21:23:23,743 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:23:23,743 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 21:23:23,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1574 [2020-07-20 21:23:23,771 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:23,772 INFO L422 BasicCegarLoop]: trace histogram [241, 241, 121, 120, 120, 120, 120, 120, 120, 120, 120, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:23,984 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:23,985 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:23,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:23,986 INFO L82 PathProgramCache]: Analyzing trace with hash 78333505, now seen corresponding path program 8 times [2020-07-20 21:23:23,987 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:23,988 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [351818568] [2020-07-20 21:23:23,988 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 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:24,553 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:24,553 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:24,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 2970 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:23:24,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:25,528 INFO L134 CoverageAnalysis]: Checked inductivity of 151380 backedges. 1563 proven. 9337 refuted. 0 times theorem prover too weak. 140480 trivial. 0 not checked. [2020-07-20 21:23:25,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:30,271 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:32,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:33,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:34,211 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:34,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:34,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:34,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:34,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:34,873 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:34,874 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:34,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:34,925 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:35,858 INFO L134 CoverageAnalysis]: Checked inductivity of 151380 backedges. 1563 proven. 9429 refuted. 0 times theorem prover too weak. 140388 trivial. 0 not checked. [2020-07-20 21:23:35,859 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [351818568] [2020-07-20 21:23:35,859 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:35,860 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 21:23:35,860 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424263798] [2020-07-20 21:23:35,862 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:23:35,862 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:35,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:23:35,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:23:35,863 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-20 21:23:36,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:36,621 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-20 21:23:36,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:23:36,622 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1573 [2020-07-20 21:23:36,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:36,628 INFO L225 Difference]: With dead ends: 102 [2020-07-20 21:23:36,628 INFO L226 Difference]: Without dead ends: 98 [2020-07-20 21:23:36,629 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3155 GetRequests, 3107 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:23:36,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-20 21:23:36,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-20 21:23:36,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 21:23:36,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 21:23:36,644 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1573 [2020-07-20 21:23:36,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:36,646 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 21:23:36,646 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:23:36,647 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 21:23:36,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1843 [2020-07-20 21:23:36,672 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:36,673 INFO L422 BasicCegarLoop]: trace histogram [269, 269, 221, 134, 134, 134, 134, 134, 134, 134, 87, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:36,886 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:36,887 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:36,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:36,887 INFO L82 PathProgramCache]: Analyzing trace with hash -323852785, now seen corresponding path program 8 times [2020-07-20 21:23:36,888 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:36,888 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2075502787] [2020-07-20 21:23:36,888 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 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:37,524 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:37,524 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:37,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 3442 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:23:37,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:38,827 INFO L134 CoverageAnalysis]: Checked inductivity of 204138 backedges. 1703 proven. 11413 refuted. 0 times theorem prover too weak. 191022 trivial. 0 not checked. [2020-07-20 21:23:38,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:44,005 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:46,695 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:46,696 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:48,078 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:48,079 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:48,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:49,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:49,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:49,250 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:49,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:49,409 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:50,707 INFO L134 CoverageAnalysis]: Checked inductivity of 204138 backedges. 1703 proven. 11513 refuted. 0 times theorem prover too weak. 190922 trivial. 0 not checked. [2020-07-20 21:23:50,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2075502787] [2020-07-20 21:23:50,708 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:50,709 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 21:23:50,709 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2018885199] [2020-07-20 21:23:50,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:23:50,711 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:50,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:23:50,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:23:50,712 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-20 21:23:51,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:51,236 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-20 21:23:51,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:23:51,237 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1842 [2020-07-20 21:23:51,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:51,242 INFO L225 Difference]: With dead ends: 107 [2020-07-20 21:23:51,243 INFO L226 Difference]: Without dead ends: 103 [2020-07-20 21:23:51,244 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3692 GetRequests, 3644 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:23:51,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-20 21:23:51,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-20 21:23:51,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 21:23:51,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 21:23:51,258 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1842 [2020-07-20 21:23:51,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:51,260 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 21:23:51,260 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:23:51,260 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 21:23:51,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2107 [2020-07-20 21:23:51,295 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:51,295 INFO L422 BasicCegarLoop]: trace histogram [323, 323, 162, 161, 161, 161, 161, 161, 161, 161, 161, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:51,496 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:51,497 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:51,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:51,498 INFO L82 PathProgramCache]: Analyzing trace with hash 211951896, now seen corresponding path program 9 times [2020-07-20 21:23:51,498 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:51,499 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1866109849] [2020-07-20 21:23:51,499 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 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:52,239 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:52,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:52,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 3973 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 21:23:52,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:54,048 INFO L134 CoverageAnalysis]: Checked inductivity of 272412 backedges. 2152 proven. 14276 refuted. 0 times theorem prover too weak. 255984 trivial. 0 not checked. [2020-07-20 21:23:54,048 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:24:00,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:04,350 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:06,092 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:06,991 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:06,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:07,531 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:07,532 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:07,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:07,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:08,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:08,216 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:08,283 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:09,874 INFO L134 CoverageAnalysis]: Checked inductivity of 272412 backedges. 2152 proven. 14393 refuted. 0 times theorem prover too weak. 255867 trivial. 0 not checked. [2020-07-20 21:24:09,874 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1866109849] [2020-07-20 21:24:09,874 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:24:09,875 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 21:24:09,875 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817087458] [2020-07-20 21:24:09,877 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 21:24:09,877 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:24:09,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 21:24:09,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 21:24:09,878 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-20 21:24:10,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:24:10,527 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-20 21:24:10,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:24:10,528 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2106 [2020-07-20 21:24:10,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:24:10,535 INFO L225 Difference]: With dead ends: 112 [2020-07-20 21:24:10,535 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 21:24:10,536 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4222 GetRequests, 4169 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 21:24:10,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 21:24:10,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-20 21:24:10,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 21:24:10,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 21:24:10,552 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2106 [2020-07-20 21:24:10,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:24:10,554 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 21:24:10,554 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 21:24:10,554 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 21:24:10,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2206 [2020-07-20 21:24:10,590 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:24:10,591 INFO L422 BasicCegarLoop]: trace histogram [323, 323, 260, 161, 161, 161, 161, 161, 161, 161, 99, 63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:24:10,803 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:10,804 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:24:10,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:24:10,805 INFO L82 PathProgramCache]: Analyzing trace with hash -576304576, now seen corresponding path program 9 times [2020-07-20 21:24:10,806 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:24:10,806 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [918086274] [2020-07-20 21:24:10,807 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 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:11,609 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:24:11,609 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:24:11,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 4123 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 21:24:11,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:24:13,904 INFO L134 CoverageAnalysis]: Checked inductivity of 293202 backedges. 2131 proven. 15429 refuted. 0 times theorem prover too weak. 275642 trivial. 0 not checked. [2020-07-20 21:24:13,904 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:24:20,862 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:24,539 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:26,427 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:26,428 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:27,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:27,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:28,170 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:28,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:28,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:28,471 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:28,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:28,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:30,153 INFO L134 CoverageAnalysis]: Checked inductivity of 293202 backedges. 2131 proven. 15555 refuted. 0 times theorem prover too weak. 275516 trivial. 0 not checked. [2020-07-20 21:24:30,154 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [918086274] [2020-07-20 21:24:30,154 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:24:30,155 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 21:24:30,155 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1339509023] [2020-07-20 21:24:30,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 21:24:30,157 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:24:30,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 21:24:30,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 21:24:30,157 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-20 21:24:30,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:24:30,865 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-20 21:24:30,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:24:30,866 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2205 [2020-07-20 21:24:30,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:24:30,872 INFO L225 Difference]: With dead ends: 117 [2020-07-20 21:24:30,872 INFO L226 Difference]: Without dead ends: 113 [2020-07-20 21:24:30,873 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4419 GetRequests, 4366 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 21:24:30,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-20 21:24:30,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-20 21:24:30,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 21:24:30,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 21:24:30,891 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2205 [2020-07-20 21:24:30,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:24:30,893 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 21:24:30,893 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 21:24:30,893 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 21:24:30,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3979 [2020-07-20 21:24:30,988 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:24:30,990 INFO L422 BasicCegarLoop]: trace histogram [611, 611, 306, 305, 305, 305, 305, 305, 305, 305, 305, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:24:31,190 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:31,191 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:24:31,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:24:31,193 INFO L82 PathProgramCache]: Analyzing trace with hash 1096565120, now seen corresponding path program 10 times [2020-07-20 21:24:31,193 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:24:31,194 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1044552648] [2020-07-20 21:24:31,194 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 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:32,552 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:24:32,552 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:24:32,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 7501 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 21:24:32,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:24:37,723 INFO L134 CoverageAnalysis]: Checked inductivity of 977220 backedges. 4000 proven. 30795 refuted. 0 times theorem prover too weak. 942425 trivial. 0 not checked. [2020-07-20 21:24:37,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:24:51,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:51,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:58,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:01,544 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:03,231 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:05,066 WARN L193 SmtUtils]: Spent 584.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:25:05,094 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:05,737 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:05,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:06,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:06,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:06,463 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:06,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:11,444 INFO L134 CoverageAnalysis]: Checked inductivity of 977220 backedges. 4000 proven. 30940 refuted. 0 times theorem prover too weak. 942280 trivial. 0 not checked. [2020-07-20 21:25:11,444 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1044552648] [2020-07-20 21:25:11,444 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:25:11,445 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 21:25:11,445 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1896572238] [2020-07-20 21:25:11,448 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 21:25:11,448 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:25:11,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 21:25:11,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 21:25:11,449 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-20 21:25:12,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:25:12,459 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-20 21:25:12,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 21:25:12,460 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 3978 [2020-07-20 21:25:12,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:25:12,468 INFO L225 Difference]: With dead ends: 122 [2020-07-20 21:25:12,468 INFO L226 Difference]: Without dead ends: 118 [2020-07-20 21:25:12,474 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7967 GetRequests, 7909 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 21:25:12,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-20 21:25:12,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-20 21:25:12,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 21:25:12,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-20 21:25:12,493 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 3978 [2020-07-20 21:25:12,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:25:12,496 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-20 21:25:12,496 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 21:25:12,496 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-20 21:25:12,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5062 [2020-07-20 21:25:12,683 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:25:12,684 INFO L422 BasicCegarLoop]: trace histogram [737, 737, 632, 368, 368, 368, 368, 368, 368, 368, 264, 105, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:25:12,885 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:25:12,885 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:25:12,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:25:12,888 INFO L82 PathProgramCache]: Analyzing trace with hash -1250597211, now seen corresponding path program 10 times [2020-07-20 21:25:12,888 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:25:12,889 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [929932846] [2020-07-20 21:25:12,889 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 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:25:14,518 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:25:14,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:25:14,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 9442 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 21:25:14,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:25:22,634 INFO L134 CoverageAnalysis]: Checked inductivity of 1554372 backedges. 5169 proven. 40185 refuted. 0 times theorem prover too weak. 1509018 trivial. 0 not checked. [2020-07-20 21:25:22,634 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:25:38,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:48,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:48,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:53,245 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:53,246 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:55,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:55,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:56,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:56,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:57,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:57,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:57,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:58,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:58,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:58,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:58,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:58,275 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:06,469 INFO L134 CoverageAnalysis]: Checked inductivity of 1554372 backedges. 5169 proven. 40340 refuted. 0 times theorem prover too weak. 1508863 trivial. 0 not checked. [2020-07-20 21:26:06,470 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [929932846] [2020-07-20 21:26:06,470 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:26:06,471 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 21:26:06,471 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129794052] [2020-07-20 21:26:06,474 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 21:26:06,475 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:26:06,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 21:26:06,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 21:26:06,475 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-20 21:26:07,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:26:07,882 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-20 21:26:07,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 21:26:07,887 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 5061 [2020-07-20 21:26:07,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:26:07,899 INFO L225 Difference]: With dead ends: 127 [2020-07-20 21:26:07,899 INFO L226 Difference]: Without dead ends: 123 [2020-07-20 21:26:07,906 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10132 GetRequests, 10074 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 21:26:07,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-20 21:26:07,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-20 21:26:07,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 21:26:07,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-20 21:26:07,943 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 5061 [2020-07-20 21:26:07,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:26:07,946 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-20 21:26:07,946 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 21:26:07,946 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-20 21:26:08,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10297 [2020-07-20 21:26:08,592 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:26:08,596 INFO L422 BasicCegarLoop]: trace histogram [1583, 1583, 792, 791, 791, 791, 791, 791, 791, 791, 791, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:26:08,796 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:26:08,797 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:26:08,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:26:08,800 INFO L82 PathProgramCache]: Analyzing trace with hash -862919848, now seen corresponding path program 11 times [2020-07-20 21:26:08,800 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:26:08,800 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [441995783] [2020-07-20 21:26:08,801 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 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:26:11,985 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:26:11,985 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:26:12,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 19405 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 21:26:12,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:26:42,575 INFO L134 CoverageAnalysis]: Checked inductivity of 6570837 backedges. 11410 proven. 88343 refuted. 0 times theorem prover too weak. 6471084 trivial. 0 not checked. [2020-07-20 21:26:42,575 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:27:17,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:24,349 WARN L193 SmtUtils]: Spent 869.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 21:27:42,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:53,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:53,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:57,515 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:57,515 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:01,012 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:02,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:02,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:03,489 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:03,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:04,053 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:04,386 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:04,387 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:04,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:04,574 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:35,451 INFO L134 CoverageAnalysis]: Checked inductivity of 6570837 backedges. 11410 proven. 88519 refuted. 0 times theorem prover too weak. 6470908 trivial. 0 not checked. [2020-07-20 21:28:35,451 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [441995783] [2020-07-20 21:28:35,452 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:28:35,454 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 21:28:35,454 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438841823] [2020-07-20 21:28:35,461 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 21:28:35,461 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:28:35,462 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 21:28:35,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:28:35,462 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-20 21:28:37,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:28:37,122 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-20 21:28:37,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 21:28:37,123 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 10296 [2020-07-20 21:28:37,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:28:37,134 INFO L225 Difference]: With dead ends: 132 [2020-07-20 21:28:37,134 INFO L226 Difference]: Without dead ends: 128 [2020-07-20 21:28:37,136 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20604 GetRequests, 20541 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 21:28:37,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-20 21:28:37,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-20 21:28:37,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 21:28:37,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-20 21:28:37,158 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 10296 [2020-07-20 21:28:37,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:28:37,164 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-20 21:28:37,164 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 21:28:37,165 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-20 21:28:37,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8429 [2020-07-20 21:28:37,523 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:28:37,525 INFO L422 BasicCegarLoop]: trace histogram [1247, 1247, 939, 623, 623, 623, 623, 623, 623, 623, 316, 308, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:28:37,726 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:28:37,726 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:28:37,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:28:37,730 INFO L82 PathProgramCache]: Analyzing trace with hash -486960372, now seen corresponding path program 11 times [2020-07-20 21:28:37,730 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:28:37,730 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1649564224] [2020-07-20 21:28:37,731 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 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:28:40,392 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:28:40,392 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:28:40,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 15763 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 21:28:40,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:29:01,963 INFO L134 CoverageAnalysis]: Checked inductivity of 4322927 backedges. 9093 proven. 73716 refuted. 0 times theorem prover too weak. 4240118 trivial. 0 not checked. [2020-07-20 21:29:01,964 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:29:34,033 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:34,034 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:43,811 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 21:29:46,894 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:57,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:57,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:03,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:03,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:05,762 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:05,763 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:07,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:07,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:08,238 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:08,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:09,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:09,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:09,171 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:09,172 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:09,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:31,208 INFO L134 CoverageAnalysis]: Checked inductivity of 4322927 backedges. 9093 proven. 73903 refuted. 0 times theorem prover too weak. 4239931 trivial. 0 not checked. [2020-07-20 21:30:31,208 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1649564224] [2020-07-20 21:30:31,208 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:30:31,210 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 21:30:31,211 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [905023935] [2020-07-20 21:30:31,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 21:30:31,215 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:30:31,215 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 21:30:31,215 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:30:31,216 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-20 21:30:31,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:30:31,986 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-20 21:30:31,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 21:30:31,987 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 8428 [2020-07-20 21:30:31,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:30:31,999 INFO L225 Difference]: With dead ends: 137 [2020-07-20 21:30:31,999 INFO L226 Difference]: Without dead ends: 133 [2020-07-20 21:30:32,001 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16867 GetRequests, 16804 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 21:30:32,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-20 21:30:32,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-20 21:30:32,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 21:30:32,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-20 21:30:32,026 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 8428 [2020-07-20 21:30:32,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:30:32,030 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-20 21:30:32,030 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 21:30:32,030 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-20 21:30:35,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19696 [2020-07-20 21:30:35,153 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:30:35,159 INFO L422 BasicCegarLoop]: trace histogram [3029, 3029, 1515, 1514, 1514, 1514, 1514, 1514, 1514, 1514, 1514, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:30:35,359 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:30:35,360 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:30:35,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:30:35,365 INFO L82 PathProgramCache]: Analyzing trace with hash 701633687, now seen corresponding path program 12 times [2020-07-20 21:30:35,365 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:30:35,365 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1694303119] [2020-07-20 21:30:35,366 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 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:30:41,413 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:30:41,413 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:30:41,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 37120 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 21:30:41,694 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:32:50,604 INFO L134 CoverageAnalysis]: Checked inductivity of 24070329 backedges. 21806 proven. 186292 refuted. 0 times theorem prover too weak. 23862231 trivial. 0 not checked. [2020-07-20 21:32:50,604 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:33:02,858 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 21:34:22,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:47,175 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 21:35:19,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:19,077 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:40,445 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 21:35:50,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:50,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts