/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_2calls_10-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 21:22:44,853 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-20 21:22:44,872 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 21:22:44,873 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 21:22:44,875 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 21:22:44,877 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 21:22:44,879 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 21:22:44,880 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 21:22:44,881 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 21:22:44,882 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 21:22:44,882 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 21:22:44,884 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 21:22:44,885 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 21:22:44,886 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 21:22:44,887 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 21:22:44,888 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 21:22:44,890 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 21:22:44,892 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 21:22:44,894 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 21:22:44,895 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 21:22:44,896 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 21:22:44,897 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 21:22:44,900 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 21:22:44,913 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 21:22:44,930 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 21:22:44,930 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 21:22:44,932 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 21:22:44,932 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 21:22:44,932 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 21:22:44,932 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 21:22:44,933 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 21:22:44,933 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 21:22:44,933 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 21:22:44,933 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 21:22:44,933 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 21:22:44,934 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 21:22:44,934 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 21:22:44,934 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 21:22:44,934 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 21:22:44,934 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 21:22:44,935 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 21:22:44,935 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 21:22:44,935 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 21:22:44,935 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 21:22:44,935 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 21:22:44,936 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:22:44,936 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 21:22:44,936 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 21:22:44,936 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 21:22:44,936 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 21:22:44,937 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:44,937 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 21:22:44,937 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 21:22:44,937 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 21:22:45,230 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 21:22:45,253 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 21:22:45,258 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 21:22:45,260 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 21:22:45,263 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 21:22:45,265 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_10-1.c [2020-07-20 21:22:45,359 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bc8437988/990eae61633349a6bbc3716078b592fc/FLAGce4560a9a [2020-07-20 21:22:45,896 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 21:22:45,897 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_10-1.c [2020-07-20 21:22:45,903 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bc8437988/990eae61633349a6bbc3716078b592fc/FLAGce4560a9a [2020-07-20 21:22:46,257 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/bc8437988/990eae61633349a6bbc3716078b592fc [2020-07-20 21:22:46,268 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 21:22:46,272 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 21:22:46,273 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 21:22:46,274 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 21:22:46,278 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 21:22:46,280 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:22:46" (1/1) ... [2020-07-20 21:22:46,283 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2a72cadb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:46, skipping insertion in model container [2020-07-20 21:22:46,284 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:22:46" (1/1) ... [2020-07-20 21:22:46,292 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 21:22:46,309 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 21:22:46,488 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:22:46,494 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 21:22:46,513 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:22:46,529 INFO L208 MainTranslator]: Completed translation [2020-07-20 21:22:46,530 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:46 WrapperNode [2020-07-20 21:22:46,530 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 21:22:46,531 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 21:22:46,531 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 21:22:46,532 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 21:22:46,547 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:46" (1/1) ... [2020-07-20 21:22:46,548 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:46" (1/1) ... [2020-07-20 21:22:46,554 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:46" (1/1) ... [2020-07-20 21:22:46,554 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:46" (1/1) ... [2020-07-20 21:22:46,559 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:46" (1/1) ... [2020-07-20 21:22:46,561 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:46" (1/1) ... [2020-07-20 21:22:46,562 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:46" (1/1) ... [2020-07-20 21:22:46,564 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 21:22:46,565 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 21:22:46,565 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 21:22:46,565 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 21:22:46,566 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:46" (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 21:22:46,723 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 21:22:46,724 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 21:22:46,724 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-20 21:22:46,724 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-20 21:22:46,724 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 21:22:46,724 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 21:22:46,724 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 21:22:46,724 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-20 21:22:46,725 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-20 21:22:46,725 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 21:22:46,725 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 21:22:46,725 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 21:22:46,941 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 21:22:46,942 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 21:22:46,947 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:22:46 BoogieIcfgContainer [2020-07-20 21:22:46,947 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 21:22:46,949 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 21:22:46,949 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 21:22:46,952 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 21:22:46,953 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 09:22:46" (1/3) ... [2020-07-20 21:22:46,954 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1123367a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:22:46, skipping insertion in model container [2020-07-20 21:22:46,954 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:46" (2/3) ... [2020-07-20 21:22:46,955 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1123367a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:22:46, skipping insertion in model container [2020-07-20 21:22:46,955 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:22:46" (3/3) ... [2020-07-20 21:22:46,957 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_10-1.c [2020-07-20 21:22:46,970 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 21:22:46,979 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 21:22:47,035 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 21:22:47,095 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 21:22:47,096 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 21:22:47,096 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 21:22:47,096 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 21:22:47,096 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 21:22:47,097 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 21:22:47,097 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 21:22:47,097 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 21:22:47,116 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 21:22:47,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 21:22:47,123 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:47,125 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:47,125 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:47,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:47,132 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-20 21:22:47,142 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:47,142 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [23799042] [2020-07-20 21:22:47,143 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 21:22:47,211 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:22:47,211 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:47,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:22:47,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:47,324 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 21:22:47,324 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:22:47,326 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [23799042] [2020-07-20 21:22:47,326 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:22:47,327 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:22:47,328 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [360857987] [2020-07-20 21:22:47,333 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:22:47,333 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:47,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:22:47,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:22:47,347 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-20 21:22:47,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:47,489 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-20 21:22:47,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:22:47,492 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 21:22:47,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:47,505 INFO L225 Difference]: With dead ends: 44 [2020-07-20 21:22:47,506 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 21:22:47,510 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 21:22:47,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 21:22:47,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 21:22:47,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 21:22:47,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 21:22:47,563 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-20 21:22:47,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:47,564 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 21:22:47,564 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:22:47,564 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 21:22:47,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 21:22:47,567 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:47,567 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:47,768 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:47,769 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:47,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:47,770 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-20 21:22:47,770 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:47,771 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [463094533] [2020-07-20 21:22:47,772 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 21:22:47,800 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:22:47,800 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:47,801 INFO L263 TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:22:47,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:47,839 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 21:22:47,839 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:22:47,840 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [463094533] [2020-07-20 21:22:47,840 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:22:47,840 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:22:47,841 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161976719] [2020-07-20 21:22:47,842 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:22:47,843 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:47,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:22:47,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:22:47,844 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-20 21:22:47,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:47,976 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 21:22:47,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:22:47,978 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 21:22:47,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:47,980 INFO L225 Difference]: With dead ends: 36 [2020-07-20 21:22:47,980 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 21:22:47,983 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 21:22:47,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 21:22:48,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 21:22:48,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 21:22:48,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 21:22:48,006 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-20 21:22:48,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:48,007 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 21:22:48,007 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:22:48,008 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 21:22:48,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 21:22:48,009 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:48,010 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:48,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:48,212 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:48,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:48,214 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-20 21:22:48,214 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:48,215 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2123109827] [2020-07-20 21:22:48,216 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 21:22:48,265 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:22:48,265 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:48,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:22:48,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:48,322 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 21:22:48,323 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:48,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:48,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:48,566 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 21:22:48,566 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2123109827] [2020-07-20 21:22:48,581 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:48,581 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 21:22:48,581 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [479540380] [2020-07-20 21:22:48,582 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 21:22:48,582 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:48,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 21:22:48,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 21:22:48,584 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-20 21:22:48,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:48,724 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-20 21:22:48,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 21:22:48,725 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 21:22:48,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:48,727 INFO L225 Difference]: With dead ends: 41 [2020-07-20 21:22:48,727 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 21:22:48,728 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 21:22:48,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 21:22:48,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-20 21:22:48,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 21:22:48,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 21:22:48,739 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-20 21:22:48,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:48,739 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 21:22:48,739 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 21:22:48,740 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 21:22:48,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 21:22:48,741 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:48,742 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:48,955 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:48,956 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:48,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:48,956 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-20 21:22:48,957 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:48,957 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1364293556] [2020-07-20 21:22:48,958 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 21:22:48,990 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:48,990 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:48,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:22:48,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:49,042 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 21:22:49,043 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:49,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:49,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:49,252 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 21:22:49,253 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1364293556] [2020-07-20 21:22:49,253 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:49,253 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 21:22:49,254 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2062705136] [2020-07-20 21:22:49,255 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 21:22:49,256 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:49,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 21:22:49,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 21:22:49,257 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-20 21:22:49,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:49,410 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-20 21:22:49,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 21:22:49,411 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 21:22:49,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:49,413 INFO L225 Difference]: With dead ends: 46 [2020-07-20 21:22:49,414 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 21:22:49,415 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 21:22:49,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 21:22:49,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-20 21:22:49,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 21:22:49,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 21:22:49,424 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-20 21:22:49,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:49,425 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 21:22:49,425 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 21:22:49,425 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 21:22:49,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 21:22:49,428 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:49,429 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:49,643 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:49,644 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:49,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:49,645 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-20 21:22:49,645 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:49,645 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [879052322] [2020-07-20 21:22:49,646 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 21:22:49,684 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:49,685 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:49,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:22:49,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:49,751 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 21:22:49,751 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:50,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:50,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:50,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:50,184 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 21:22:50,185 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [879052322] [2020-07-20 21:22:50,185 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:50,185 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 21:22:50,186 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442630675] [2020-07-20 21:22:50,186 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 21:22:50,186 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:50,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 21:22:50,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 21:22:50,187 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-20 21:22:50,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:50,400 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-20 21:22:50,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:22:50,401 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-20 21:22:50,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:50,405 INFO L225 Difference]: With dead ends: 51 [2020-07-20 21:22:50,406 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 21:22:50,410 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:22:50,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 21:22:50,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-20 21:22:50,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 21:22:50,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 21:22:50,422 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-20 21:22:50,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:50,423 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 21:22:50,423 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 21:22:50,423 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 21:22:50,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 21:22:50,425 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:50,425 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:50,633 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:50,635 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:50,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:50,635 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-20 21:22:50,636 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:50,637 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [170170632] [2020-07-20 21:22:50,637 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 21:22:50,669 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:50,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:50,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:22:50,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:50,737 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 21:22:50,737 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:50,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:51,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:51,049 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:51,088 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 21:22:51,089 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [170170632] [2020-07-20 21:22:51,089 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:51,089 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 21:22:51,089 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1439425587] [2020-07-20 21:22:51,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 21:22:51,090 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:51,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 21:22:51,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 21:22:51,091 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-20 21:22:51,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:51,283 INFO L93 Difference]: Finished difference Result 56 states and 84 transitions. [2020-07-20 21:22:51,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:22:51,285 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-20 21:22:51,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:51,292 INFO L225 Difference]: With dead ends: 56 [2020-07-20 21:22:51,293 INFO L226 Difference]: Without dead ends: 52 [2020-07-20 21:22:51,294 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:22:51,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-20 21:22:51,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2020-07-20 21:22:51,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 21:22:51,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 21:22:51,317 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 40 [2020-07-20 21:22:51,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:51,320 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 21:22:51,320 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 21:22:51,320 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 21:22:51,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-20 21:22:51,329 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:51,330 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:51,543 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:51,544 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:51,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:51,544 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2020-07-20 21:22:51,545 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:51,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2043032868] [2020-07-20 21:22:51,545 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 21:22:51,594 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:51,595 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:51,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:22:51,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:51,691 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 21:22:51,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:52,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:52,078 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:52,176 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:52,235 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:52,287 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 21:22:52,288 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2043032868] [2020-07-20 21:22:52,288 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:52,288 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 21:22:52,289 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [243549756] [2020-07-20 21:22:52,289 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 21:22:52,289 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:52,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 21:22:52,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:22:52,290 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 14 states. [2020-07-20 21:22:52,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:52,514 INFO L93 Difference]: Finished difference Result 61 states and 96 transitions. [2020-07-20 21:22:52,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:22:52,515 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 52 [2020-07-20 21:22:52,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:52,517 INFO L225 Difference]: With dead ends: 61 [2020-07-20 21:22:52,520 INFO L226 Difference]: Without dead ends: 57 [2020-07-20 21:22:52,521 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 86 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 21:22:52,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-20 21:22:52,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2020-07-20 21:22:52,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 21:22:52,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 21:22:52,551 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 52 [2020-07-20 21:22:52,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:52,552 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 21:22:52,552 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 21:22:52,552 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 21:22:52,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-20 21:22:52,562 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:52,562 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:52,776 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:52,777 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:52,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:52,778 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-20 21:22:52,778 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:52,779 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1368325407] [2020-07-20 21:22:52,779 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 21:22:52,838 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:52,839 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:52,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:22:52,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:52,911 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-07-20 21:22:52,911 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:53,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:53,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:53,362 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:53,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:53,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:53,458 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 21:22:53,459 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1368325407] [2020-07-20 21:22:53,459 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:53,460 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 21:22:53,460 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1320490111] [2020-07-20 21:22:53,460 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 21:22:53,461 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:53,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 21:22:53,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:22:53,461 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 14 states. [2020-07-20 21:22:53,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:53,678 INFO L93 Difference]: Finished difference Result 66 states and 110 transitions. [2020-07-20 21:22:53,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:22:53,678 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 54 [2020-07-20 21:22:53,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:53,682 INFO L225 Difference]: With dead ends: 66 [2020-07-20 21:22:53,682 INFO L226 Difference]: Without dead ends: 62 [2020-07-20 21:22:53,683 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 90 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 21:22:53,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-20 21:22:53,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 45. [2020-07-20 21:22:53,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 21:22:53,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 21:22:53,698 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 54 [2020-07-20 21:22:53,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:53,699 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 21:22:53,699 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 21:22:53,699 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 21:22:53,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-20 21:22:53,701 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:53,701 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:53,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:53,915 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:53,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:53,916 INFO L82 PathProgramCache]: Analyzing trace with hash -975547772, now seen corresponding path program 3 times [2020-07-20 21:22:53,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:53,917 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [77651080] [2020-07-20 21:22:53,917 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 21:22:53,974 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:53,975 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:53,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:22:53,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:54,078 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 60 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-20 21:22:54,078 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:54,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:54,701 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:54,861 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:54,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:54,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:55,012 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:55,013 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:55,061 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 68 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2020-07-20 21:22:55,062 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [77651080] [2020-07-20 21:22:55,062 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:55,062 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 21:22:55,063 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1457630257] [2020-07-20 21:22:55,063 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 21:22:55,063 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:55,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 21:22:55,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 21:22:55,064 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 16 states. [2020-07-20 21:22:55,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:55,349 INFO L93 Difference]: Finished difference Result 71 states and 124 transitions. [2020-07-20 21:22:55,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:22:55,350 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 78 [2020-07-20 21:22:55,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:55,352 INFO L225 Difference]: With dead ends: 71 [2020-07-20 21:22:55,353 INFO L226 Difference]: Without dead ends: 67 [2020-07-20 21:22:55,354 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 134 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:22:55,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-20 21:22:55,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 50. [2020-07-20 21:22:55,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 21:22:55,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-20 21:22:55,375 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 78 [2020-07-20 21:22:55,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:55,375 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-20 21:22:55,376 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 21:22:55,376 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-20 21:22:55,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-20 21:22:55,378 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:55,378 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:55,581 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:55,582 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:55,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:55,582 INFO L82 PathProgramCache]: Analyzing trace with hash 1891337214, now seen corresponding path program 2 times [2020-07-20 21:22:55,583 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:55,583 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1499285618] [2020-07-20 21:22:55,584 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 21:22:55,653 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:55,654 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:55,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:22:55,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:55,731 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 115 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-07-20 21:22:55,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:56,346 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:56,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:56,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:56,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:56,747 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 125 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-07-20 21:22:56,748 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1499285618] [2020-07-20 21:22:56,748 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:56,748 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 21:22:56,748 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [200195944] [2020-07-20 21:22:56,750 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 21:22:56,750 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:56,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 21:22:56,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 21:22:56,751 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 16 states. [2020-07-20 21:22:56,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:56,984 INFO L93 Difference]: Finished difference Result 76 states and 140 transitions. [2020-07-20 21:22:56,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:22:56,985 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 108 [2020-07-20 21:22:56,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:56,987 INFO L225 Difference]: With dead ends: 76 [2020-07-20 21:22:56,987 INFO L226 Difference]: Without dead ends: 72 [2020-07-20 21:22:56,988 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 192 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:22:56,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-20 21:22:57,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 50. [2020-07-20 21:22:57,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 21:22:57,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-20 21:22:57,014 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 108 [2020-07-20 21:22:57,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:57,014 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-20 21:22:57,014 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 21:22:57,015 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-20 21:22:57,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2020-07-20 21:22:57,018 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:57,019 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 13, 13, 12, 9, 9, 9, 9, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:57,232 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:57,233 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:57,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:57,234 INFO L82 PathProgramCache]: Analyzing trace with hash -815433282, now seen corresponding path program 4 times [2020-07-20 21:22:57,235 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:57,235 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1273637962] [2020-07-20 21:22:57,235 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 21:22:57,330 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:57,330 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:57,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 393 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 21:22:57,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:57,427 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 332 refuted. 0 times theorem prover too weak. 800 trivial. 0 not checked. [2020-07-20 21:22:57,427 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:58,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:58,871 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:58,873 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,040 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,042 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,132 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:59,238 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 346 refuted. 0 times theorem prover too weak. 786 trivial. 0 not checked. [2020-07-20 21:22:59,239 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1273637962] [2020-07-20 21:22:59,239 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:59,239 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 21:22:59,239 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510565812] [2020-07-20 21:22:59,240 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 21:22:59,240 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:59,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 21:22:59,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 21:22:59,241 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 18 states. [2020-07-20 21:22:59,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:59,531 INFO L93 Difference]: Finished difference Result 81 states and 156 transitions. [2020-07-20 21:22:59,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:22:59,532 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 208 [2020-07-20 21:22:59,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:59,536 INFO L225 Difference]: With dead ends: 81 [2020-07-20 21:22:59,536 INFO L226 Difference]: Without dead ends: 77 [2020-07-20 21:22:59,537 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 389 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 21:22:59,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-07-20 21:22:59,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 55. [2020-07-20 21:22:59,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-20 21:22:59,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-20 21:22:59,547 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 208 [2020-07-20 21:22:59,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:59,548 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-20 21:22:59,548 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 21:22:59,548 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-20 21:22:59,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 21:22:59,550 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:59,550 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:59,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:59,765 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:59,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:59,765 INFO L82 PathProgramCache]: Analyzing trace with hash 1180347891, now seen corresponding path program 2 times [2020-07-20 21:22:59,766 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:59,766 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1120769438] [2020-07-20 21:22:59,767 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 21:22:59,849 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:59,850 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:59,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 21:22:59,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:59,938 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 24 proven. 149 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2020-07-20 21:22:59,938 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:00,816 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:01,042 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:01,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:01,191 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:01,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:01,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:01,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:01,373 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 24 proven. 165 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2020-07-20 21:23:01,373 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1120769438] [2020-07-20 21:23:01,374 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:01,374 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 21:23:01,374 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262380818] [2020-07-20 21:23:01,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 21:23:01,375 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:01,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 21:23:01,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 21:23:01,376 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 18 states. [2020-07-20 21:23:01,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:01,704 INFO L93 Difference]: Finished difference Result 86 states and 174 transitions. [2020-07-20 21:23:01,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:23:01,704 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 121 [2020-07-20 21:23:01,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:01,706 INFO L225 Difference]: With dead ends: 86 [2020-07-20 21:23:01,706 INFO L226 Difference]: Without dead ends: 82 [2020-07-20 21:23:01,707 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 214 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 21:23:01,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-07-20 21:23:01,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 55. [2020-07-20 21:23:01,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-20 21:23:01,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-20 21:23:01,717 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 121 [2020-07-20 21:23:01,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:01,717 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-20 21:23:01,717 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 21:23:01,717 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-20 21:23:01,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2020-07-20 21:23:01,720 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:01,720 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 11, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:01,933 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:01,934 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:01,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:01,935 INFO L82 PathProgramCache]: Analyzing trace with hash 2099307065, now seen corresponding path program 5 times [2020-07-20 21:23:01,935 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:01,935 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1201101720] [2020-07-20 21:23:01,936 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 21:23:02,057 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:02,057 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:02,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 370 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 21:23:02,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:02,186 INFO L134 CoverageAnalysis]: Checked inductivity of 1023 backedges. 62 proven. 331 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2020-07-20 21:23:02,186 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:03,532 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:03,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:03,973 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:04,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:04,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:04,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:04,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:04,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:04,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:04,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:04,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:04,578 INFO L134 CoverageAnalysis]: Checked inductivity of 1023 backedges. 62 proven. 352 refuted. 0 times theorem prover too weak. 609 trivial. 0 not checked. [2020-07-20 21:23:04,579 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1201101720] [2020-07-20 21:23:04,579 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:04,579 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 21:23:04,579 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396988432] [2020-07-20 21:23:04,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 21:23:04,580 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:04,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 21:23:04,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:23:04,581 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 20 states. [2020-07-20 21:23:04,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:04,975 INFO L93 Difference]: Finished difference Result 91 states and 192 transitions. [2020-07-20 21:23:04,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 21:23:04,979 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 195 [2020-07-20 21:23:04,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:04,981 INFO L225 Difference]: With dead ends: 91 [2020-07-20 21:23:04,981 INFO L226 Difference]: Without dead ends: 87 [2020-07-20 21:23:04,982 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 359 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 21:23:04,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-07-20 21:23:04,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 60. [2020-07-20 21:23:04,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 21:23:04,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 100 transitions. [2020-07-20 21:23:04,993 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 100 transitions. Word has length 195 [2020-07-20 21:23:04,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:04,993 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 100 transitions. [2020-07-20 21:23:04,994 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 21:23:04,994 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 100 transitions. [2020-07-20 21:23:04,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-07-20 21:23:04,996 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:04,997 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 12, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:05,209 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:05,210 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:05,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:05,211 INFO L82 PathProgramCache]: Analyzing trace with hash 266210309, now seen corresponding path program 3 times [2020-07-20 21:23:05,211 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:05,212 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1865903883] [2020-07-20 21:23:05,212 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 21:23:05,348 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:05,348 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:05,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 382 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 21:23:05,355 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:05,480 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 69 proven. 347 refuted. 0 times theorem prover too weak. 658 trivial. 0 not checked. [2020-07-20 21:23:05,480 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:06,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:07,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:07,252 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:07,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:07,679 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:07,770 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 21:23:07,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:07,910 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 69 proven. 371 refuted. 0 times theorem prover too weak. 634 trivial. 0 not checked. [2020-07-20 21:23:07,911 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1865903883] [2020-07-20 21:23:07,911 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:07,911 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 21:23:07,911 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [754133835] [2020-07-20 21:23:07,912 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 21:23:07,912 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:07,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 21:23:07,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:23:07,913 INFO L87 Difference]: Start difference. First operand 60 states and 100 transitions. Second operand 20 states. [2020-07-20 21:23:08,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:08,283 INFO L93 Difference]: Finished difference Result 96 states and 212 transitions. [2020-07-20 21:23:08,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 21:23:08,284 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 201 [2020-07-20 21:23:08,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:08,287 INFO L225 Difference]: With dead ends: 96 [2020-07-20 21:23:08,287 INFO L226 Difference]: Without dead ends: 92 [2020-07-20 21:23:08,288 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 370 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 21:23:08,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-07-20 21:23:08,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 60. [2020-07-20 21:23:08,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 21:23:08,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 100 transitions. [2020-07-20 21:23:08,298 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 100 transitions. Word has length 201 [2020-07-20 21:23:08,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:08,298 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 100 transitions. [2020-07-20 21:23:08,298 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 21:23:08,299 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 100 transitions. [2020-07-20 21:23:08,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 352 [2020-07-20 21:23:08,304 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:08,304 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 22, 21, 21, 16, 16, 16, 16, 16, 16, 16, 16, 10, 10, 10, 10, 10, 10, 10, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:08,517 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:08,518 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:08,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:08,519 INFO L82 PathProgramCache]: Analyzing trace with hash -865443995, now seen corresponding path program 6 times [2020-07-20 21:23:08,519 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:08,520 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [944161573] [2020-07-20 21:23:08,520 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 21:23:08,704 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:08,704 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:08,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 664 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:23:08,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:08,880 INFO L134 CoverageAnalysis]: Checked inductivity of 3649 backedges. 117 proven. 819 refuted. 0 times theorem prover too weak. 2713 trivial. 0 not checked. [2020-07-20 21:23:08,881 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:10,926 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:10,927 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:11,598 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:11,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:11,972 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:11,973 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:12,206 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:12,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:12,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:12,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:12,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:12,631 INFO L134 CoverageAnalysis]: Checked inductivity of 3649 backedges. 117 proven. 849 refuted. 0 times theorem prover too weak. 2683 trivial. 0 not checked. [2020-07-20 21:23:12,632 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [944161573] [2020-07-20 21:23:12,632 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:12,632 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-20 21:23:12,633 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1417209488] [2020-07-20 21:23:12,633 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 21:23:12,634 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:12,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 21:23:12,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-20 21:23:12,634 INFO L87 Difference]: Start difference. First operand 60 states and 100 transitions. Second operand 22 states. [2020-07-20 21:23:13,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:13,107 INFO L93 Difference]: Finished difference Result 101 states and 232 transitions. [2020-07-20 21:23:13,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:23:13,108 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 351 [2020-07-20 21:23:13,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:13,113 INFO L225 Difference]: With dead ends: 101 [2020-07-20 21:23:13,113 INFO L226 Difference]: Without dead ends: 97 [2020-07-20 21:23:13,115 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 711 GetRequests, 667 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-20 21:23:13,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-07-20 21:23:13,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 65. [2020-07-20 21:23:13,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-20 21:23:13,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 114 transitions. [2020-07-20 21:23:13,129 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 114 transitions. Word has length 351 [2020-07-20 21:23:13,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:13,130 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 114 transitions. [2020-07-20 21:23:13,130 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 21:23:13,130 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 114 transitions. [2020-07-20 21:23:13,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 338 [2020-07-20 21:23:13,133 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:13,134 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 22, 21, 21, 14, 14, 14, 14, 14, 14, 14, 14, 12, 10, 10, 10, 10, 10, 10, 10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:13,346 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:13,347 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:13,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:13,348 INFO L82 PathProgramCache]: Analyzing trace with hash 1413996641, now seen corresponding path program 3 times [2020-07-20 21:23:13,348 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:13,349 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [659920263] [2020-07-20 21:23:13,349 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 21:23:13,550 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:13,551 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:13,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 636 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:23:13,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:13,750 INFO L134 CoverageAnalysis]: Checked inductivity of 3218 backedges. 137 proven. 762 refuted. 0 times theorem prover too weak. 2319 trivial. 0 not checked. [2020-07-20 21:23:13,750 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:15,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:15,790 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:16,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:16,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:17,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:17,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:17,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:17,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:17,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:17,551 INFO L134 CoverageAnalysis]: Checked inductivity of 3218 backedges. 137 proven. 795 refuted. 0 times theorem prover too weak. 2286 trivial. 0 not checked. [2020-07-20 21:23:17,552 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [659920263] [2020-07-20 21:23:17,552 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:17,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-20 21:23:17,552 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693258094] [2020-07-20 21:23:17,553 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 21:23:17,554 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:17,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 21:23:17,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-20 21:23:17,556 INFO L87 Difference]: Start difference. First operand 65 states and 114 transitions. Second operand 22 states. [2020-07-20 21:23:18,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:18,019 INFO L93 Difference]: Finished difference Result 106 states and 254 transitions. [2020-07-20 21:23:18,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:23:18,020 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 337 [2020-07-20 21:23:18,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:18,023 INFO L225 Difference]: With dead ends: 106 [2020-07-20 21:23:18,023 INFO L226 Difference]: Without dead ends: 102 [2020-07-20 21:23:18,028 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 682 GetRequests, 638 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-20 21:23:18,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-07-20 21:23:18,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 65. [2020-07-20 21:23:18,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-20 21:23:18,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 114 transitions. [2020-07-20 21:23:18,044 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 114 transitions. Word has length 337 [2020-07-20 21:23:18,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:18,046 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 114 transitions. [2020-07-20 21:23:18,046 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 21:23:18,046 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 114 transitions. [2020-07-20 21:23:18,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 820 [2020-07-20 21:23:18,053 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:18,054 INFO L422 BasicCegarLoop]: trace histogram [73, 73, 52, 52, 47, 36, 36, 36, 36, 36, 36, 36, 36, 26, 26, 26, 26, 26, 26, 26, 26, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:18,268 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:18,269 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:18,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:18,270 INFO L82 PathProgramCache]: Analyzing trace with hash -1230346157, now seen corresponding path program 7 times [2020-07-20 21:23:18,271 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:18,271 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1733339866] [2020-07-20 21:23:18,271 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 21:23:18,644 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:18,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:18,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 1546 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:23:18,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:19,095 INFO L134 CoverageAnalysis]: Checked inductivity of 20591 backedges. 373 proven. 2371 refuted. 0 times theorem prover too weak. 17847 trivial. 0 not checked. [2020-07-20 21:23:19,096 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:22,973 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:23,986 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:24,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:24,806 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:25,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:25,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:25,627 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:25,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:25,784 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:25,888 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:25,889 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:25,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:26,302 INFO L134 CoverageAnalysis]: Checked inductivity of 20591 backedges. 373 proven. 2411 refuted. 0 times theorem prover too weak. 17807 trivial. 0 not checked. [2020-07-20 21:23:26,302 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1733339866] [2020-07-20 21:23:26,303 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:26,303 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 24 [2020-07-20 21:23:26,303 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [914553766] [2020-07-20 21:23:26,305 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 21:23:26,305 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:26,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 21:23:26,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2020-07-20 21:23:26,306 INFO L87 Difference]: Start difference. First operand 65 states and 114 transitions. Second operand 24 states. [2020-07-20 21:23:26,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:26,897 INFO L93 Difference]: Finished difference Result 111 states and 276 transitions. [2020-07-20 21:23:26,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:23:26,898 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 819 [2020-07-20 21:23:26,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:26,902 INFO L225 Difference]: With dead ends: 111 [2020-07-20 21:23:26,902 INFO L226 Difference]: Without dead ends: 107 [2020-07-20 21:23:26,904 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1648 GetRequests, 1599 SyntacticMatches, 18 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=205, Invalid=851, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 21:23:26,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-07-20 21:23:26,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 70. [2020-07-20 21:23:26,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-20 21:23:26,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 129 transitions. [2020-07-20 21:23:26,922 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 129 transitions. Word has length 819 [2020-07-20 21:23:26,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:26,924 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 129 transitions. [2020-07-20 21:23:26,924 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 21:23:26,924 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 129 transitions. [2020-07-20 21:23:26,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 419 [2020-07-20 21:23:26,927 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:26,928 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 27, 24, 24, 18, 18, 18, 18, 18, 18, 18, 18, 15, 12, 12, 12, 12, 12, 12, 12, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:27,138 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:27,139 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:27,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:27,140 INFO L82 PathProgramCache]: Analyzing trace with hash 2047786411, now seen corresponding path program 4 times [2020-07-20 21:23:27,140 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:27,140 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1717754422] [2020-07-20 21:23:27,141 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 21:23:27,443 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:27,443 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:27,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 786 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:23:27,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:27,642 INFO L134 CoverageAnalysis]: Checked inductivity of 5148 backedges. 188 proven. 1118 refuted. 0 times theorem prover too weak. 3842 trivial. 0 not checked. [2020-07-20 21:23:27,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:30,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:31,284 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:31,285 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:32,029 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:32,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:32,722 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:32,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:32,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:32,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:32,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:33,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:33,185 INFO L134 CoverageAnalysis]: Checked inductivity of 5148 backedges. 188 proven. 1162 refuted. 0 times theorem prover too weak. 3798 trivial. 0 not checked. [2020-07-20 21:23:33,186 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1717754422] [2020-07-20 21:23:33,186 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:33,186 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 21:23:33,186 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324723190] [2020-07-20 21:23:33,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:23:33,187 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:33,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:23:33,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:23:33,188 INFO L87 Difference]: Start difference. First operand 70 states and 129 transitions. Second operand 23 states. [2020-07-20 21:23:33,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:33,749 INFO L93 Difference]: Finished difference Result 116 states and 300 transitions. [2020-07-20 21:23:33,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:23:33,750 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 418 [2020-07-20 21:23:33,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:33,754 INFO L225 Difference]: With dead ends: 116 [2020-07-20 21:23:33,754 INFO L226 Difference]: Without dead ends: 112 [2020-07-20 21:23:33,755 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 845 GetRequests, 796 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:23:33,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-07-20 21:23:33,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 70. [2020-07-20 21:23:33,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-20 21:23:33,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 129 transitions. [2020-07-20 21:23:33,767 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 129 transitions. Word has length 418 [2020-07-20 21:23:33,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:33,768 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 129 transitions. [2020-07-20 21:23:33,768 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:23:33,768 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 129 transitions. [2020-07-20 21:23:33,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 677 [2020-07-20 21:23:33,774 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:33,775 INFO L422 BasicCegarLoop]: trace histogram [62, 62, 42, 41, 41, 31, 31, 31, 31, 31, 31, 31, 31, 20, 20, 20, 20, 20, 20, 20, 20, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:33,988 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:33,989 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:33,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:33,989 INFO L82 PathProgramCache]: Analyzing trace with hash -1777656900, now seen corresponding path program 8 times [2020-07-20 21:23:33,990 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:33,990 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [420789557] [2020-07-20 21:23:33,990 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 21:23:34,379 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:34,380 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:34,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 1275 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 21:23:34,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:34,742 INFO L134 CoverageAnalysis]: Checked inductivity of 14119 backedges. 349 proven. 2104 refuted. 0 times theorem prover too weak. 11666 trivial. 0 not checked. [2020-07-20 21:23:34,743 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:38,559 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:38,560 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:39,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:39,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:41,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:41,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:41,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:42,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:42,639 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:42,640 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:42,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:42,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:42,907 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:42,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:42,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:43,241 INFO L134 CoverageAnalysis]: Checked inductivity of 14119 backedges. 349 proven. 2156 refuted. 0 times theorem prover too weak. 11614 trivial. 0 not checked. [2020-07-20 21:23:43,241 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [420789557] [2020-07-20 21:23:43,241 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:43,242 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 21:23:43,242 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [63420484] [2020-07-20 21:23:43,243 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 21:23:43,243 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:43,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 21:23:43,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 21:23:43,244 INFO L87 Difference]: Start difference. First operand 70 states and 129 transitions. Second operand 25 states. [2020-07-20 21:23:43,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:43,873 INFO L93 Difference]: Finished difference Result 121 states and 324 transitions. [2020-07-20 21:23:43,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 21:23:43,874 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 676 [2020-07-20 21:23:43,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:43,877 INFO L225 Difference]: With dead ends: 121 [2020-07-20 21:23:43,877 INFO L226 Difference]: Without dead ends: 117 [2020-07-20 21:23:43,879 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1363 GetRequests, 1309 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 279 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 21:23:43,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2020-07-20 21:23:43,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 75. [2020-07-20 21:23:43,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-07-20 21:23:43,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 145 transitions. [2020-07-20 21:23:43,892 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 145 transitions. Word has length 676 [2020-07-20 21:23:43,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:43,893 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 145 transitions. [2020-07-20 21:23:43,893 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 21:23:43,893 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 145 transitions. [2020-07-20 21:23:43,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 755 [2020-07-20 21:23:43,900 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:43,901 INFO L422 BasicCegarLoop]: trace histogram [64, 64, 49, 47, 47, 32, 32, 32, 32, 32, 32, 32, 32, 26, 23, 23, 23, 23, 23, 23, 23, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:44,115 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:44,116 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:44,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:44,117 INFO L82 PathProgramCache]: Analyzing trace with hash -1813836186, now seen corresponding path program 4 times [2020-07-20 21:23:44,117 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:44,118 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1617293750] [2020-07-20 21:23:44,118 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 21:23:44,574 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:44,574 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:44,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 1415 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:23:44,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:44,971 INFO L134 CoverageAnalysis]: Checked inductivity of 17056 backedges. 414 proven. 2048 refuted. 0 times theorem prover too weak. 14594 trivial. 0 not checked. [2020-07-20 21:23:44,972 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:48,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:48,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:49,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:50,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:50,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:51,452 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:51,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:51,841 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:52,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:52,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:52,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:52,300 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:52,533 INFO L134 CoverageAnalysis]: Checked inductivity of 17056 backedges. 414 proven. 2088 refuted. 0 times theorem prover too weak. 14554 trivial. 0 not checked. [2020-07-20 21:23:52,534 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1617293750] [2020-07-20 21:23:52,534 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:52,534 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 21:23:52,534 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006670229] [2020-07-20 21:23:52,535 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:23:52,535 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:52,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:23:52,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:23:52,536 INFO L87 Difference]: Start difference. First operand 75 states and 145 transitions. Second operand 23 states. [2020-07-20 21:23:53,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:53,191 INFO L93 Difference]: Finished difference Result 159 states and 539 transitions. [2020-07-20 21:23:53,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:23:53,192 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 754 [2020-07-20 21:23:53,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:53,196 INFO L225 Difference]: With dead ends: 159 [2020-07-20 21:23:53,196 INFO L226 Difference]: Without dead ends: 155 [2020-07-20 21:23:53,197 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1517 GetRequests, 1468 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:23:53,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2020-07-20 21:23:53,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 77. [2020-07-20 21:23:53,216 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-07-20 21:23:53,217 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 152 transitions. [2020-07-20 21:23:53,217 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 152 transitions. Word has length 754 [2020-07-20 21:23:53,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:53,218 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 152 transitions. [2020-07-20 21:23:53,218 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:23:53,218 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 152 transitions. [2020-07-20 21:23:53,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 766 [2020-07-20 21:23:53,225 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:53,226 INFO L422 BasicCegarLoop]: trace histogram [66, 66, 47, 45, 45, 45, 33, 33, 33, 33, 33, 33, 33, 25, 22, 22, 22, 22, 22, 22, 22, 19, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:53,440 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:53,440 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:53,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:53,442 INFO L82 PathProgramCache]: Analyzing trace with hash 848822556, now seen corresponding path program 1 times [2020-07-20 21:23:53,442 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:53,443 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1287936442] [2020-07-20 21:23:53,443 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 21:23:53,943 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:53,943 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:53,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 1433 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:23:53,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:54,321 INFO L134 CoverageAnalysis]: Checked inductivity of 17647 backedges. 424 proven. 1891 refuted. 0 times theorem prover too weak. 15332 trivial. 0 not checked. [2020-07-20 21:23:54,321 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:57,404 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:57,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:58,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:59,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:59,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:00,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:00,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:00,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:00,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:00,471 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:00,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:00,523 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:00,770 INFO L134 CoverageAnalysis]: Checked inductivity of 17647 backedges. 424 proven. 1924 refuted. 0 times theorem prover too weak. 15299 trivial. 0 not checked. [2020-07-20 21:24:00,771 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1287936442] [2020-07-20 21:24:00,771 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:24:00,771 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 21:24:00,771 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118411111] [2020-07-20 21:24:00,772 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:24:00,772 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:24:00,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:24:00,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:24:00,773 INFO L87 Difference]: Start difference. First operand 77 states and 152 transitions. Second operand 21 states. [2020-07-20 21:24:01,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:24:01,347 INFO L93 Difference]: Finished difference Result 179 states and 673 transitions. [2020-07-20 21:24:01,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:24:01,348 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 765 [2020-07-20 21:24:01,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:24:01,357 INFO L225 Difference]: With dead ends: 179 [2020-07-20 21:24:01,358 INFO L226 Difference]: Without dead ends: 175 [2020-07-20 21:24:01,359 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1538 GetRequests, 1494 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:24:01,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2020-07-20 21:24:01,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 79. [2020-07-20 21:24:01,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-07-20 21:24:01,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 160 transitions. [2020-07-20 21:24:01,386 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 160 transitions. Word has length 765 [2020-07-20 21:24:01,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:24:01,386 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 160 transitions. [2020-07-20 21:24:01,387 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:24:01,387 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 160 transitions. [2020-07-20 21:24:01,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1080 [2020-07-20 21:24:01,399 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:24:01,400 INFO L422 BasicCegarLoop]: trace histogram [82, 82, 77, 77, 61, 57, 41, 41, 41, 41, 41, 41, 41, 38, 38, 38, 38, 38, 38, 38, 25, 20, 19, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:24:01,614 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:01,615 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:24:01,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:24:01,616 INFO L82 PathProgramCache]: Analyzing trace with hash 67032718, now seen corresponding path program 1 times [2020-07-20 21:24:01,616 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:24:01,617 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [512180619] [2020-07-20 21:24:01,617 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 21:24:02,257 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:24:02,258 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:24:02,267 INFO L263 TraceCheckSpWp]: Trace formula consists of 2021 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:24:02,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:24:02,900 INFO L134 CoverageAnalysis]: Checked inductivity of 34506 backedges. 604 proven. 3056 refuted. 0 times theorem prover too weak. 30846 trivial. 0 not checked. [2020-07-20 21:24:02,900 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:24:07,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:09,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:09,587 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:10,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:10,940 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:11,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:11,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:11,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:11,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:12,175 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:12,176 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:12,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:12,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:12,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:12,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:12,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:13,019 INFO L134 CoverageAnalysis]: Checked inductivity of 34506 backedges. 604 proven. 3096 refuted. 0 times theorem prover too weak. 30806 trivial. 0 not checked. [2020-07-20 21:24:13,020 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [512180619] [2020-07-20 21:24:13,020 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:24:13,020 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 21:24:13,020 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [880627223] [2020-07-20 21:24:13,022 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:24:13,022 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:24:13,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:24:13,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:24:13,023 INFO L87 Difference]: Start difference. First operand 79 states and 160 transitions. Second operand 23 states. [2020-07-20 21:24:13,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:24:13,699 INFO L93 Difference]: Finished difference Result 156 states and 522 transitions. [2020-07-20 21:24:13,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:24:13,703 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1079 [2020-07-20 21:24:13,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:24:13,708 INFO L225 Difference]: With dead ends: 156 [2020-07-20 21:24:13,708 INFO L226 Difference]: Without dead ends: 152 [2020-07-20 21:24:13,710 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2166 GetRequests, 2117 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:24:13,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2020-07-20 21:24:13,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 82. [2020-07-20 21:24:13,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-07-20 21:24:13,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 170 transitions. [2020-07-20 21:24:13,729 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 170 transitions. Word has length 1079 [2020-07-20 21:24:13,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:24:13,730 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 170 transitions. [2020-07-20 21:24:13,730 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:24:13,730 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 170 transitions. [2020-07-20 21:24:13,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 981 [2020-07-20 21:24:13,741 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:24:13,741 INFO L422 BasicCegarLoop]: trace histogram [73, 73, 70, 70, 62, 53, 36, 36, 36, 36, 36, 36, 36, 35, 35, 35, 35, 35, 35, 35, 27, 17, 17, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:24:13,956 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:13,957 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:24:13,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:24:13,958 INFO L82 PathProgramCache]: Analyzing trace with hash -1973171480, now seen corresponding path program 2 times [2020-07-20 21:24:13,958 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:24:13,959 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [606544542] [2020-07-20 21:24:13,959 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 21:24:14,568 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:24:14,568 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:24:14,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 1831 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:24:14,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:24:15,632 INFO L134 CoverageAnalysis]: Checked inductivity of 28341 backedges. 583 proven. 2408 refuted. 0 times theorem prover too weak. 25350 trivial. 0 not checked. [2020-07-20 21:24:15,632 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:24:15,897 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 21:24:19,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:19,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:21,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:21,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:21,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:21,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:22,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:22,752 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:23,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:23,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:23,266 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:23,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:23,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:23,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:23,422 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:23,898 INFO L134 CoverageAnalysis]: Checked inductivity of 28341 backedges. 583 proven. 2441 refuted. 0 times theorem prover too weak. 25317 trivial. 0 not checked. [2020-07-20 21:24:23,899 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [606544542] [2020-07-20 21:24:23,899 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:24:23,899 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 21:24:23,900 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858190779] [2020-07-20 21:24:23,901 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:24:23,901 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:24:23,901 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:24:23,902 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:24:23,902 INFO L87 Difference]: Start difference. First operand 82 states and 170 transitions. Second operand 21 states. [2020-07-20 21:24:24,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:24:24,527 INFO L93 Difference]: Finished difference Result 174 states and 639 transitions. [2020-07-20 21:24:24,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:24:24,528 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 980 [2020-07-20 21:24:24,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:24:24,533 INFO L225 Difference]: With dead ends: 174 [2020-07-20 21:24:24,534 INFO L226 Difference]: Without dead ends: 170 [2020-07-20 21:24:24,535 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1967 GetRequests, 1923 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:24:24,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2020-07-20 21:24:24,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 89. [2020-07-20 21:24:24,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-07-20 21:24:24,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 197 transitions. [2020-07-20 21:24:24,562 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 197 transitions. Word has length 980 [2020-07-20 21:24:24,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:24:24,563 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 197 transitions. [2020-07-20 21:24:24,563 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:24:24,563 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 197 transitions. [2020-07-20 21:24:24,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1135 [2020-07-20 21:24:24,578 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:24:24,579 INFO L422 BasicCegarLoop]: trace histogram [88, 88, 79, 79, 65, 60, 44, 44, 44, 44, 44, 44, 44, 39, 39, 39, 39, 39, 39, 39, 28, 21, 21, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:24:24,793 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:24,794 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:24:24,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:24:24,794 INFO L82 PathProgramCache]: Analyzing trace with hash -191683652, now seen corresponding path program 3 times [2020-07-20 21:24:24,795 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:24:24,795 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1340451630] [2020-07-20 21:24:24,795 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 21:24:25,582 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:24:25,583 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:24:25,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 2125 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 21:24:25,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:24:26,352 INFO L134 CoverageAnalysis]: Checked inductivity of 38234 backedges. 764 proven. 3594 refuted. 0 times theorem prover too weak. 33876 trivial. 0 not checked. [2020-07-20 21:24:26,353 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:24:32,235 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:34,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:36,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:37,815 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:38,385 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:38,386 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:38,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:38,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:38,971 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:39,101 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:39,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:39,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:39,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:39,265 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:39,824 INFO L134 CoverageAnalysis]: Checked inductivity of 38234 backedges. 770 proven. 3644 refuted. 0 times theorem prover too weak. 33820 trivial. 0 not checked. [2020-07-20 21:24:39,825 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1340451630] [2020-07-20 21:24:39,825 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:24:39,825 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 21:24:39,825 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1307075941] [2020-07-20 21:24:39,826 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 21:24:39,827 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:24:39,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 21:24:39,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 21:24:39,827 INFO L87 Difference]: Start difference. First operand 89 states and 197 transitions. Second operand 25 states. [2020-07-20 21:24:41,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:24:41,126 INFO L93 Difference]: Finished difference Result 263 states and 1331 transitions. [2020-07-20 21:24:41,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 21:24:41,128 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1134 [2020-07-20 21:24:41,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:24:41,134 INFO L225 Difference]: With dead ends: 263 [2020-07-20 21:24:41,134 INFO L226 Difference]: Without dead ends: 142 [2020-07-20 21:24:41,140 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2277 GetRequests, 2223 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 21:24:41,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2020-07-20 21:24:41,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2020-07-20 21:24:41,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2020-07-20 21:24:41,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 326 transitions. [2020-07-20 21:24:41,169 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 326 transitions. Word has length 1134 [2020-07-20 21:24:41,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:24:41,170 INFO L479 AbstractCegarLoop]: Abstraction has 142 states and 326 transitions. [2020-07-20 21:24:41,170 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 21:24:41,170 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 326 transitions. [2020-07-20 21:24:41,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1001 [2020-07-20 21:24:41,184 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:24:41,185 INFO L422 BasicCegarLoop]: trace histogram [84, 84, 63, 63, 58, 53, 42, 42, 42, 42, 42, 42, 42, 31, 31, 31, 31, 31, 31, 31, 31, 22, 16, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:24:41,397 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:41,398 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:24:41,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:24:41,399 INFO L82 PathProgramCache]: Analyzing trace with hash 873446842, now seen corresponding path program 4 times [2020-07-20 21:24:41,399 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:24:41,400 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [259828503] [2020-07-20 21:24:41,400 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 21:24:42,181 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:24:42,181 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:24:42,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 1871 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 21:24:42,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:24:42,714 INFO L134 CoverageAnalysis]: Checked inductivity of 30091 backedges. 639 proven. 3181 refuted. 0 times theorem prover too weak. 26271 trivial. 0 not checked. [2020-07-20 21:24:42,714 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:24:49,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:49,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:51,598 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:51,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:53,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:54,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:54,157 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:54,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:54,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:55,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:55,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:55,346 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:55,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:55,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:55,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:55,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:55,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:56,249 INFO L134 CoverageAnalysis]: Checked inductivity of 30091 backedges. 643 proven. 3233 refuted. 0 times theorem prover too weak. 26215 trivial. 0 not checked. [2020-07-20 21:24:56,249 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [259828503] [2020-07-20 21:24:56,249 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:24:56,250 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 21:24:56,250 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593223126] [2020-07-20 21:24:56,251 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 21:24:56,251 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:24:56,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 21:24:56,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 21:24:56,252 INFO L87 Difference]: Start difference. First operand 142 states and 326 transitions. Second operand 25 states. [2020-07-20 21:24:57,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:24:57,481 INFO L93 Difference]: Finished difference Result 385 states and 1941 transitions. [2020-07-20 21:24:57,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 21:24:57,483 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1000 [2020-07-20 21:24:57,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:24:57,492 INFO L225 Difference]: With dead ends: 385 [2020-07-20 21:24:57,493 INFO L226 Difference]: Without dead ends: 198 [2020-07-20 21:24:57,505 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2009 GetRequests, 1955 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 21:24:57,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2020-07-20 21:24:57,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 147. [2020-07-20 21:24:57,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2020-07-20 21:24:57,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 346 transitions. [2020-07-20 21:24:57,535 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 346 transitions. Word has length 1000 [2020-07-20 21:24:57,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:24:57,536 INFO L479 AbstractCegarLoop]: Abstraction has 147 states and 346 transitions. [2020-07-20 21:24:57,536 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 21:24:57,536 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 346 transitions. [2020-07-20 21:24:57,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 982 [2020-07-20 21:24:57,551 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:24:57,552 INFO L422 BasicCegarLoop]: trace histogram [75, 75, 70, 70, 53, 51, 37, 37, 37, 37, 37, 37, 37, 35, 35, 35, 35, 35, 35, 35, 22, 19, 18, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:24:57,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:57,765 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:24:57,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:24:57,766 INFO L82 PathProgramCache]: Analyzing trace with hash 401393431, now seen corresponding path program 5 times [2020-07-20 21:24:57,767 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:24:57,767 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1088964548] [2020-07-20 21:24:57,768 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 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:58,581 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:24:58,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:24:58,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 1842 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:24:58,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:24:59,306 INFO L134 CoverageAnalysis]: Checked inductivity of 28457 backedges. 601 proven. 2717 refuted. 0 times theorem prover too weak. 25139 trivial. 0 not checked. [2020-07-20 21:24:59,306 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:25:05,243 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 21:25:05,567 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:07,870 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:07,871 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:09,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:10,542 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:11,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:11,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:11,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:11,422 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:11,515 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:11,629 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:12,171 INFO L134 CoverageAnalysis]: Checked inductivity of 28457 backedges. 603 proven. 2755 refuted. 0 times theorem prover too weak. 25099 trivial. 0 not checked. [2020-07-20 21:25:12,172 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1088964548] [2020-07-20 21:25:12,172 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:25:12,172 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 21:25:12,172 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376568472] [2020-07-20 21:25:12,173 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:25:12,173 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:25:12,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:25:12,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:25:12,174 INFO L87 Difference]: Start difference. First operand 147 states and 346 transitions. Second operand 23 states. [2020-07-20 21:25:13,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:25:13,309 INFO L93 Difference]: Finished difference Result 263 states and 940 transitions. [2020-07-20 21:25:13,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:25:13,311 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 981 [2020-07-20 21:25:13,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:25:13,321 INFO L225 Difference]: With dead ends: 263 [2020-07-20 21:25:13,321 INFO L226 Difference]: Without dead ends: 249 [2020-07-20 21:25:13,325 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1970 GetRequests, 1921 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:25:13,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2020-07-20 21:25:13,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 150. [2020-07-20 21:25:13,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2020-07-20 21:25:13,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 358 transitions. [2020-07-20 21:25:13,365 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 358 transitions. Word has length 981 [2020-07-20 21:25:13,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:25:13,366 INFO L479 AbstractCegarLoop]: Abstraction has 150 states and 358 transitions. [2020-07-20 21:25:13,367 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:25:13,367 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 358 transitions. [2020-07-20 21:25:13,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 935 [2020-07-20 21:25:13,384 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:25:13,384 INFO L422 BasicCegarLoop]: trace histogram [70, 70, 67, 67, 55, 50, 35, 35, 35, 35, 35, 35, 35, 33, 33, 33, 33, 33, 33, 33, 20, 20, 17, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:25:13,597 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:25:13,598 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:25:13,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:25:13,599 INFO L82 PathProgramCache]: Analyzing trace with hash 1939979877, now seen corresponding path program 6 times [2020-07-20 21:25:13,599 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:25:13,599 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [337794350] [2020-07-20 21:25:13,599 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 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:25:14,403 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:25:14,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:25:14,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 1750 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:25:14,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:25:14,845 INFO L134 CoverageAnalysis]: Checked inductivity of 25706 backedges. 511 proven. 2289 refuted. 0 times theorem prover too weak. 22906 trivial. 0 not checked. [2020-07-20 21:25:14,845 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:25:15,732 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 21:25:20,626 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:22,737 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:22,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:24,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:24,721 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:25,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:25,383 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:25,384 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:25,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:25,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:25,558 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:25,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:26,167 INFO L134 CoverageAnalysis]: Checked inductivity of 25706 backedges. 511 proven. 2319 refuted. 0 times theorem prover too weak. 22876 trivial. 0 not checked. [2020-07-20 21:25:26,168 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [337794350] [2020-07-20 21:25:26,169 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:25:26,169 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 21:25:26,169 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463620825] [2020-07-20 21:25:26,170 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:25:26,170 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:25:26,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:25:26,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:25:26,171 INFO L87 Difference]: Start difference. First operand 150 states and 358 transitions. Second operand 21 states. [2020-07-20 21:25:27,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:25:27,011 INFO L93 Difference]: Finished difference Result 299 states and 1198 transitions. [2020-07-20 21:25:27,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:25:27,014 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 934 [2020-07-20 21:25:27,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:25:27,024 INFO L225 Difference]: With dead ends: 299 [2020-07-20 21:25:27,024 INFO L226 Difference]: Without dead ends: 285 [2020-07-20 21:25:27,029 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1875 GetRequests, 1831 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:25:27,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2020-07-20 21:25:27,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 150. [2020-07-20 21:25:27,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2020-07-20 21:25:27,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 358 transitions. [2020-07-20 21:25:27,080 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 358 transitions. Word has length 934 [2020-07-20 21:25:27,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:25:27,082 INFO L479 AbstractCegarLoop]: Abstraction has 150 states and 358 transitions. [2020-07-20 21:25:27,082 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:25:27,082 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 358 transitions. [2020-07-20 21:25:27,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1121 [2020-07-20 21:25:27,100 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:25:27,101 INFO L422 BasicCegarLoop]: trace histogram [86, 86, 77, 77, 69, 66, 43, 43, 43, 43, 43, 43, 43, 38, 38, 38, 38, 38, 38, 38, 28, 26, 20, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:25:27,316 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:25:27,317 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:25:27,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:25:27,318 INFO L82 PathProgramCache]: Analyzing trace with hash -1849137250, now seen corresponding path program 7 times [2020-07-20 21:25:27,318 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:25:27,319 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [924300091] [2020-07-20 21:25:27,319 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:25:28,323 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:25:28,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:25:28,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 2091 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:25:28,352 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:25:29,166 INFO L134 CoverageAnalysis]: Checked inductivity of 37239 backedges. 585 proven. 2878 refuted. 0 times theorem prover too weak. 33776 trivial. 0 not checked. [2020-07-20 21:25:29,166 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:25:31,197 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 21:25:35,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:35,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:37,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:39,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:39,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:39,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:39,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:40,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:40,191 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:40,375 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:40,375 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:40,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:40,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:41,415 INFO L134 CoverageAnalysis]: Checked inductivity of 37239 backedges. 587 proven. 2909 refuted. 0 times theorem prover too weak. 33743 trivial. 0 not checked. [2020-07-20 21:25:41,415 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [924300091] [2020-07-20 21:25:41,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:25:41,416 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 21:25:41,416 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249300642] [2020-07-20 21:25:41,417 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:25:41,417 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:25:41,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:25:41,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:25:41,417 INFO L87 Difference]: Start difference. First operand 150 states and 358 transitions. Second operand 21 states. [2020-07-20 21:25:42,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:25:42,090 INFO L93 Difference]: Finished difference Result 251 states and 812 transitions. [2020-07-20 21:25:42,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:25:42,092 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1120 [2020-07-20 21:25:42,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:25:42,098 INFO L225 Difference]: With dead ends: 251 [2020-07-20 21:25:42,099 INFO L226 Difference]: Without dead ends: 237 [2020-07-20 21:25:42,102 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2247 GetRequests, 2203 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:25:42,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2020-07-20 21:25:42,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 170. [2020-07-20 21:25:42,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2020-07-20 21:25:42,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 456 transitions. [2020-07-20 21:25:42,149 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 456 transitions. Word has length 1120 [2020-07-20 21:25:42,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:25:42,150 INFO L479 AbstractCegarLoop]: Abstraction has 170 states and 456 transitions. [2020-07-20 21:25:42,150 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:25:42,150 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 456 transitions. [2020-07-20 21:25:42,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1319 [2020-07-20 21:25:42,173 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:25:42,174 INFO L422 BasicCegarLoop]: trace histogram [103, 103, 92, 92, 72, 69, 51, 51, 51, 51, 51, 51, 51, 46, 46, 46, 46, 46, 46, 46, 31, 26, 23, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:25:42,389 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:25:42,390 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:25:42,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:25:42,391 INFO L82 PathProgramCache]: Analyzing trace with hash 1147462940, now seen corresponding path program 8 times [2020-07-20 21:25:42,392 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:25:42,392 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1139467204] [2020-07-20 21:25:42,392 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 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:25:43,410 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:25:43,411 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:25:43,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 2471 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:25:43,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:25:44,398 INFO L134 CoverageAnalysis]: Checked inductivity of 51898 backedges. 728 proven. 3822 refuted. 0 times theorem prover too weak. 47348 trivial. 0 not checked. [2020-07-20 21:25:44,398 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:25:45,773 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:25:55,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:58,443 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:58,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:01,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:02,383 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:02,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:03,188 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:03,381 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:03,523 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:03,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:04,801 INFO L134 CoverageAnalysis]: Checked inductivity of 51898 backedges. 730 proven. 3860 refuted. 0 times theorem prover too weak. 47308 trivial. 0 not checked. [2020-07-20 21:26:04,802 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1139467204] [2020-07-20 21:26:04,802 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:26:04,802 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 21:26:04,803 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981503181] [2020-07-20 21:26:04,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:26:04,804 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:26:04,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:26:04,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:26:04,804 INFO L87 Difference]: Start difference. First operand 170 states and 456 transitions. Second operand 23 states. [2020-07-20 21:26:05,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:26:05,773 INFO L93 Difference]: Finished difference Result 254 states and 839 transitions. [2020-07-20 21:26:05,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:26:05,775 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1318 [2020-07-20 21:26:05,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:26:05,781 INFO L225 Difference]: With dead ends: 254 [2020-07-20 21:26:05,782 INFO L226 Difference]: Without dead ends: 240 [2020-07-20 21:26:05,785 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2644 GetRequests, 2595 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:26:05,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2020-07-20 21:26:05,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 166. [2020-07-20 21:26:05,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2020-07-20 21:26:05,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 436 transitions. [2020-07-20 21:26:05,820 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 436 transitions. Word has length 1318 [2020-07-20 21:26:05,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:26:05,821 INFO L479 AbstractCegarLoop]: Abstraction has 166 states and 436 transitions. [2020-07-20 21:26:05,821 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:26:05,821 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 436 transitions. [2020-07-20 21:26:05,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1113 [2020-07-20 21:26:05,841 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:26:05,841 INFO L422 BasicCegarLoop]: trace histogram [83, 83, 80, 80, 66, 61, 41, 41, 41, 41, 41, 41, 41, 40, 40, 40, 40, 40, 40, 40, 26, 20, 19, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:26:06,054 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:26:06,055 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:26:06,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:26:06,056 INFO L82 PathProgramCache]: Analyzing trace with hash -308825062, now seen corresponding path program 9 times [2020-07-20 21:26:06,056 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:26:06,056 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [619945543] [2020-07-20 21:26:06,057 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 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:26:06,986 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:26:06,986 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:26:06,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 2079 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:26:07,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:26:07,848 INFO L134 CoverageAnalysis]: Checked inductivity of 36627 backedges. 648 proven. 2715 refuted. 0 times theorem prover too weak. 33264 trivial. 0 not checked. [2020-07-20 21:26:07,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:26:15,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:18,288 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:18,288 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:19,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:20,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:20,679 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:20,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:21,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:21,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:21,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:21,408 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:22,263 INFO L134 CoverageAnalysis]: Checked inductivity of 36627 backedges. 648 proven. 2747 refuted. 0 times theorem prover too weak. 33232 trivial. 0 not checked. [2020-07-20 21:26:22,263 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [619945543] [2020-07-20 21:26:22,264 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:26:22,264 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 21:26:22,264 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988354796] [2020-07-20 21:26:22,265 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:26:22,265 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:26:22,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:26:22,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:26:22,266 INFO L87 Difference]: Start difference. First operand 166 states and 436 transitions. Second operand 21 states. [2020-07-20 21:26:22,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:26:22,966 INFO L93 Difference]: Finished difference Result 269 states and 930 transitions. [2020-07-20 21:26:22,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:26:22,968 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1112 [2020-07-20 21:26:22,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:26:22,977 INFO L225 Difference]: With dead ends: 269 [2020-07-20 21:26:22,977 INFO L226 Difference]: Without dead ends: 255 [2020-07-20 21:26:22,981 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2231 GetRequests, 2187 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:26:22,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2020-07-20 21:26:23,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 160. [2020-07-20 21:26:23,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2020-07-20 21:26:23,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 409 transitions. [2020-07-20 21:26:23,019 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 409 transitions. Word has length 1112 [2020-07-20 21:26:23,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:26:23,020 INFO L479 AbstractCegarLoop]: Abstraction has 160 states and 409 transitions. [2020-07-20 21:26:23,020 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:26:23,020 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 409 transitions. [2020-07-20 21:26:23,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1065 [2020-07-20 21:26:23,041 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:26:23,042 INFO L422 BasicCegarLoop]: trace histogram [79, 79, 76, 76, 64, 63, 39, 39, 39, 39, 39, 39, 39, 38, 38, 38, 38, 38, 38, 38, 26, 24, 15, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:26:23,254 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:26:23,255 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:26:23,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:26:23,255 INFO L82 PathProgramCache]: Analyzing trace with hash -1760487966, now seen corresponding path program 10 times [2020-07-20 21:26:23,256 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:26:23,256 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [792995112] [2020-07-20 21:26:23,257 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 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:26:24,332 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:26:24,333 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:26:24,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 1987 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 21:26:24,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:26:24,906 INFO L134 CoverageAnalysis]: Checked inductivity of 33469 backedges. 670 proven. 2195 refuted. 0 times theorem prover too weak. 30604 trivial. 0 not checked. [2020-07-20 21:26:24,906 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:26:31,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:31,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:34,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:36,562 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:36,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:37,885 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:38,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:38,136 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:38,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:38,410 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:38,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:39,698 INFO L134 CoverageAnalysis]: Checked inductivity of 33469 backedges. 670 proven. 2219 refuted. 0 times theorem prover too weak. 30580 trivial. 0 not checked. [2020-07-20 21:26:39,698 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [792995112] [2020-07-20 21:26:39,698 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:26:39,699 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 21:26:39,699 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898384858] [2020-07-20 21:26:39,700 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 21:26:39,700 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:26:39,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 21:26:39,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:26:39,701 INFO L87 Difference]: Start difference. First operand 160 states and 409 transitions. Second operand 19 states. [2020-07-20 21:26:40,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:26:40,824 INFO L93 Difference]: Finished difference Result 324 states and 1425 transitions. [2020-07-20 21:26:40,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 21:26:40,827 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 1064 [2020-07-20 21:26:40,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:26:40,836 INFO L225 Difference]: With dead ends: 324 [2020-07-20 21:26:40,836 INFO L226 Difference]: Without dead ends: 310 [2020-07-20 21:26:40,840 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2134 GetRequests, 2095 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 21:26:40,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2020-07-20 21:26:40,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 162. [2020-07-20 21:26:40,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2020-07-20 21:26:40,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 422 transitions. [2020-07-20 21:26:40,893 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 422 transitions. Word has length 1064 [2020-07-20 21:26:40,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:26:40,894 INFO L479 AbstractCegarLoop]: Abstraction has 162 states and 422 transitions. [2020-07-20 21:26:40,895 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 21:26:40,895 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 422 transitions. [2020-07-20 21:26:40,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1076 [2020-07-20 21:26:40,913 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:26:40,913 INFO L422 BasicCegarLoop]: trace histogram [84, 84, 73, 73, 64, 62, 42, 42, 42, 42, 42, 42, 42, 36, 36, 36, 36, 36, 36, 36, 28, 20, 20, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:26:41,127 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:26:41,128 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:26:41,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:26:41,129 INFO L82 PathProgramCache]: Analyzing trace with hash -93075103, now seen corresponding path program 11 times [2020-07-20 21:26:41,130 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:26:41,130 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [339929495] [2020-07-20 21:26:41,131 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 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:26:42,116 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:26:42,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:26:42,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 2010 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 21:26:42,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:26:43,004 INFO L134 CoverageAnalysis]: Checked inductivity of 34327 backedges. 791 proven. 3334 refuted. 0 times theorem prover too weak. 30202 trivial. 0 not checked. [2020-07-20 21:26:43,005 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:26:45,782 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:26:45,888 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:26:45,997 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 21:26:46,105 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 21:26:53,880 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:26:54,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:59,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:01,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:01,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:03,889 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:04,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:04,929 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:05,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:06,227 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:06,228 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:06,532 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:06,533 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:06,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:06,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:07,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:08,194 INFO L134 CoverageAnalysis]: Checked inductivity of 34327 backedges. 795 proven. 3386 refuted. 0 times theorem prover too weak. 30146 trivial. 0 not checked. [2020-07-20 21:27:08,195 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [339929495] [2020-07-20 21:27:08,195 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:27:08,196 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 21:27:08,196 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1004138569] [2020-07-20 21:27:08,197 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 21:27:08,198 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:27:08,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 21:27:08,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 21:27:08,198 INFO L87 Difference]: Start difference. First operand 162 states and 422 transitions. Second operand 25 states. [2020-07-20 21:27:10,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:27:10,072 INFO L93 Difference]: Finished difference Result 260 states and 883 transitions. [2020-07-20 21:27:10,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 21:27:10,075 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1075 [2020-07-20 21:27:10,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:27:10,080 INFO L225 Difference]: With dead ends: 260 [2020-07-20 21:27:10,080 INFO L226 Difference]: Without dead ends: 197 [2020-07-20 21:27:10,085 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2159 GetRequests, 2105 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 21:27:10,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2020-07-20 21:27:10,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 175. [2020-07-20 21:27:10,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2020-07-20 21:27:10,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 473 transitions. [2020-07-20 21:27:10,118 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 473 transitions. Word has length 1075 [2020-07-20 21:27:10,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:27:10,119 INFO L479 AbstractCegarLoop]: Abstraction has 175 states and 473 transitions. [2020-07-20 21:27:10,119 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 21:27:10,119 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 473 transitions. [2020-07-20 21:27:10,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1126 [2020-07-20 21:27:10,140 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:27:10,140 INFO L422 BasicCegarLoop]: trace histogram [87, 87, 78, 78, 66, 62, 43, 43, 43, 43, 43, 43, 43, 39, 39, 39, 39, 39, 39, 39, 27, 21, 19, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:27:10,353 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:27:10,354 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:27:10,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:27:10,355 INFO L82 PathProgramCache]: Analyzing trace with hash -1544488279, now seen corresponding path program 12 times [2020-07-20 21:27:10,356 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:27:10,356 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2017750278] [2020-07-20 21:27:10,356 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 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:27:11,376 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:27:11,376 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:27:11,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 2108 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:27:11,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:27:12,435 INFO L134 CoverageAnalysis]: Checked inductivity of 37588 backedges. 725 proven. 2675 refuted. 0 times theorem prover too weak. 34188 trivial. 0 not checked. [2020-07-20 21:27:12,436 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:27:22,373 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:22,374 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:28,600 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:28,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:31,132 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:31,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:33,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:33,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:33,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:33,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:33,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:33,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:34,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:34,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:34,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:35,613 INFO L134 CoverageAnalysis]: Checked inductivity of 37588 backedges. 727 proven. 2703 refuted. 0 times theorem prover too weak. 34158 trivial. 0 not checked. [2020-07-20 21:27:35,613 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2017750278] [2020-07-20 21:27:35,613 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:27:35,614 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 21:27:35,614 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1896050117] [2020-07-20 21:27:35,615 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:27:35,616 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:27:35,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:27:35,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:27:35,616 INFO L87 Difference]: Start difference. First operand 175 states and 473 transitions. Second operand 21 states. [2020-07-20 21:27:36,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:27:36,468 INFO L93 Difference]: Finished difference Result 261 states and 855 transitions. [2020-07-20 21:27:36,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:27:36,471 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1125 [2020-07-20 21:27:36,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:27:36,478 INFO L225 Difference]: With dead ends: 261 [2020-07-20 21:27:36,478 INFO L226 Difference]: Without dead ends: 247 [2020-07-20 21:27:36,480 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2257 GetRequests, 2213 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:27:36,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2020-07-20 21:27:36,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 173. [2020-07-20 21:27:36,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-20 21:27:36,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 458 transitions. [2020-07-20 21:27:36,512 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 458 transitions. Word has length 1125 [2020-07-20 21:27:36,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:27:36,513 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 458 transitions. [2020-07-20 21:27:36,513 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:27:36,514 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 458 transitions. [2020-07-20 21:27:36,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1301 [2020-07-20 21:27:36,533 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:27:36,534 INFO L422 BasicCegarLoop]: trace histogram [100, 100, 91, 91, 75, 72, 50, 50, 50, 50, 50, 50, 50, 45, 45, 45, 45, 45, 45, 45, 28, 27, 25, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:27:36,747 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:27:36,748 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:27:36,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:27:36,748 INFO L82 PathProgramCache]: Analyzing trace with hash -1066207712, now seen corresponding path program 13 times [2020-07-20 21:27:36,749 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:27:36,749 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [755901973] [2020-07-20 21:27:36,749 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 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:27:37,821 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:27:37,821 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:27:37,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 2431 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:27:37,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:27:38,868 INFO L134 CoverageAnalysis]: Checked inductivity of 50371 backedges. 833 proven. 3691 refuted. 0 times theorem prover too weak. 45847 trivial. 0 not checked. [2020-07-20 21:27:38,868 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:27:43,136 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:27:43,253 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:27:43,376 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 21:27:43,496 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 21:27:43,612 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 21:27:43,716 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 21:27:54,609 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:57,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:57,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:00,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:01,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:01,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:02,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:02,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:02,425 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:02,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:02,632 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:02,753 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:02,863 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:03,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:04,270 INFO L134 CoverageAnalysis]: Checked inductivity of 50371 backedges. 841 proven. 3727 refuted. 0 times theorem prover too weak. 45803 trivial. 0 not checked. [2020-07-20 21:28:04,271 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [755901973] [2020-07-20 21:28:04,271 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:28:04,272 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 21:28:04,272 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517177995] [2020-07-20 21:28:04,273 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:28:04,273 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:28:04,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:28:04,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:28:04,274 INFO L87 Difference]: Start difference. First operand 173 states and 458 transitions. Second operand 23 states. [2020-07-20 21:28:05,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:28:05,473 INFO L93 Difference]: Finished difference Result 296 states and 1021 transitions. [2020-07-20 21:28:05,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:28:05,476 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1300 [2020-07-20 21:28:05,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:28:05,483 INFO L225 Difference]: With dead ends: 296 [2020-07-20 21:28:05,483 INFO L226 Difference]: Without dead ends: 233 [2020-07-20 21:28:05,487 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2608 GetRequests, 2559 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:28:05,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2020-07-20 21:28:05,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 187. [2020-07-20 21:28:05,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2020-07-20 21:28:05,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 513 transitions. [2020-07-20 21:28:05,521 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 513 transitions. Word has length 1300 [2020-07-20 21:28:05,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:28:05,522 INFO L479 AbstractCegarLoop]: Abstraction has 187 states and 513 transitions. [2020-07-20 21:28:05,522 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:28:05,522 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 513 transitions. [2020-07-20 21:28:05,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1037 [2020-07-20 21:28:05,543 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:28:05,544 INFO L422 BasicCegarLoop]: trace histogram [80, 80, 71, 71, 62, 61, 40, 40, 40, 40, 40, 40, 40, 35, 35, 35, 35, 35, 35, 35, 26, 22, 19, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:28:05,758 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:28:05,759 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:28:05,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:28:05,760 INFO L82 PathProgramCache]: Analyzing trace with hash 1622447694, now seen corresponding path program 14 times [2020-07-20 21:28:05,760 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:28:05,760 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [459555515] [2020-07-20 21:28:05,760 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:28:06,893 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:28:06,894 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:28:06,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 1935 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:28:06,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:28:07,764 INFO L134 CoverageAnalysis]: Checked inductivity of 31801 backedges. 760 proven. 2427 refuted. 0 times theorem prover too weak. 28614 trivial. 0 not checked. [2020-07-20 21:28:07,765 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:28:11,190 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 21:28:11,293 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 21:28:18,521 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:28:18,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:18,991 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:24,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:27,578 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:27,578 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:28,206 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:28,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:28,995 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:28,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:29,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:29,784 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:31,806 INFO L134 CoverageAnalysis]: Checked inductivity of 31801 backedges. 762 proven. 2458 refuted. 0 times theorem prover too weak. 28581 trivial. 0 not checked. [2020-07-20 21:28:31,806 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [459555515] [2020-07-20 21:28:31,807 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:28:31,807 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 21:28:31,807 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [360670973] [2020-07-20 21:28:31,808 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:28:31,808 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:28:31,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:28:31,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:28:31,809 INFO L87 Difference]: Start difference. First operand 187 states and 513 transitions. Second operand 21 states. [2020-07-20 21:28:33,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:28:33,174 INFO L93 Difference]: Finished difference Result 297 states and 1088 transitions. [2020-07-20 21:28:33,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:28:33,180 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1036 [2020-07-20 21:28:33,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:28:33,187 INFO L225 Difference]: With dead ends: 297 [2020-07-20 21:28:33,188 INFO L226 Difference]: Without dead ends: 280 [2020-07-20 21:28:33,191 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2079 GetRequests, 2035 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:28:33,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2020-07-20 21:28:33,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 216. [2020-07-20 21:28:33,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2020-07-20 21:28:33,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 668 transitions. [2020-07-20 21:28:33,242 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 668 transitions. Word has length 1036 [2020-07-20 21:28:33,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:28:33,244 INFO L479 AbstractCegarLoop]: Abstraction has 216 states and 668 transitions. [2020-07-20 21:28:33,244 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:28:33,244 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 668 transitions. [2020-07-20 21:28:33,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1436 [2020-07-20 21:28:33,274 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:28:33,275 INFO L422 BasicCegarLoop]: trace histogram [115, 115, 96, 96, 81, 81, 57, 57, 57, 57, 57, 57, 57, 48, 48, 48, 48, 48, 48, 48, 34, 33, 24, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:28:33,488 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:28:33,489 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:28:33,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:28:33,491 INFO L82 PathProgramCache]: Analyzing trace with hash -814421188, now seen corresponding path program 15 times [2020-07-20 21:28:33,491 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:28:33,491 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1705403944] [2020-07-20 21:28:33,492 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 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:28:34,693 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:28:34,694 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:28:34,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 2685 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 21:28:34,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:28:36,048 INFO L134 CoverageAnalysis]: Checked inductivity of 61836 backedges. 1294 proven. 4277 refuted. 0 times theorem prover too weak. 56265 trivial. 0 not checked. [2020-07-20 21:28:36,048 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:28:39,057 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:28:39,169 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:28:39,278 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:28:39,387 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:28:40,705 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:28:40,841 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:28:40,979 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 21:28:41,119 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 21:28:42,192 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 21:28:42,336 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 21:28:42,485 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 21:28:42,630 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 21:28:42,762 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 21:28:42,893 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 21:28:43,028 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 21:28:43,156 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 21:28:43,275 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 21:28:43,386 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 21:28:43,491 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 21:28:51,127 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:28:51,235 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:28:52,710 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:28:52,836 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:28:52,971 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 21:28:53,106 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 21:28:53,239 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 21:28:53,361 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 21:28:53,477 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 21:28:53,585 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 21:28:53,689 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 21:28:54,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:00,846 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 21:29:04,559 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:29:04,678 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:29:04,808 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:29:04,935 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:29:05,057 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 21:29:05,171 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 21:29:05,276 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 21:29:05,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:12,031 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:29:12,134 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:29:12,238 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:29:12,348 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:29:12,456 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 21:29:12,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:12,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:14,908 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:16,469 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:16,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:17,657 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:18,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:18,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:18,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:18,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:18,999 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:19,698 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:22,250 INFO L134 CoverageAnalysis]: Checked inductivity of 61836 backedges. 1296 proven. 4331 refuted. 0 times theorem prover too weak. 56209 trivial. 0 not checked. [2020-07-20 21:29:22,251 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1705403944] [2020-07-20 21:29:22,251 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:29:22,251 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-20 21:29:22,251 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199197333] [2020-07-20 21:29:22,253 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 21:29:22,253 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:29:22,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 21:29:22,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-20 21:29:22,253 INFO L87 Difference]: Start difference. First operand 216 states and 668 transitions. Second operand 25 states. [2020-07-20 21:29:24,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:29:24,434 INFO L93 Difference]: Finished difference Result 299 states and 1008 transitions. [2020-07-20 21:29:24,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 21:29:24,439 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1435 [2020-07-20 21:29:24,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:29:24,445 INFO L225 Difference]: With dead ends: 299 [2020-07-20 21:29:24,445 INFO L226 Difference]: Without dead ends: 253 [2020-07-20 21:29:24,448 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2879 GetRequests, 2825 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 21:29:24,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2020-07-20 21:29:24,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 244. [2020-07-20 21:29:24,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 244 states. [2020-07-20 21:29:24,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 738 transitions. [2020-07-20 21:29:24,487 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 738 transitions. Word has length 1435 [2020-07-20 21:29:24,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:29:24,488 INFO L479 AbstractCegarLoop]: Abstraction has 244 states and 738 transitions. [2020-07-20 21:29:24,488 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 21:29:24,489 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 738 transitions. [2020-07-20 21:29:24,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1692 [2020-07-20 21:29:24,525 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:29:24,526 INFO L422 BasicCegarLoop]: trace histogram [133, 133, 118, 118, 91, 87, 66, 66, 66, 66, 66, 66, 66, 59, 59, 59, 59, 59, 59, 59, 46, 28, 27, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:29:24,739 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:29:24,740 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:29:24,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:29:24,741 INFO L82 PathProgramCache]: Analyzing trace with hash 1905899226, now seen corresponding path program 16 times [2020-07-20 21:29:24,741 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:29:24,741 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [485687663] [2020-07-20 21:29:24,742 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 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:29:26,121 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:29:26,122 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:29:26,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 3169 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:29:26,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:29:27,720 INFO L134 CoverageAnalysis]: Checked inductivity of 85984 backedges. 1065 proven. 4843 refuted. 0 times theorem prover too weak. 80076 trivial. 0 not checked. [2020-07-20 21:29:27,721 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:29:30,405 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:29:30,510 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:29:30,625 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:29:30,732 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:29:32,223 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:29:32,340 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:29:32,464 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:29:32,580 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:29:34,661 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:29:34,798 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:29:35,082 WARN L193 SmtUtils]: Spent 280.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 21:29:35,235 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 21:29:35,385 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 21:29:35,521 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 21:29:35,637 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 21:29:35,748 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 21:29:52,450 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:29:53,269 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:29:53,380 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:29:54,796 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:29:54,922 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:29:55,058 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:29:55,197 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:29:55,331 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 21:29:55,452 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 21:29:55,566 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 21:29:55,669 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:29:56,026 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:02,541 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:02,542 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:05,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:06,415 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:06,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:07,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:07,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:07,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:07,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:07,760 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:09,423 INFO L134 CoverageAnalysis]: Checked inductivity of 85984 backedges. 1069 proven. 4879 refuted. 0 times theorem prover too weak. 80036 trivial. 0 not checked. [2020-07-20 21:30:09,424 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [485687663] [2020-07-20 21:30:09,424 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:30:09,424 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 21:30:09,424 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1031364181] [2020-07-20 21:30:09,426 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:30:09,426 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:30:09,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:30:09,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:30:09,427 INFO L87 Difference]: Start difference. First operand 244 states and 738 transitions. Second operand 23 states. [2020-07-20 21:30:10,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:30:10,415 INFO L93 Difference]: Finished difference Result 332 states and 1206 transitions. [2020-07-20 21:30:10,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:30:10,418 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1691 [2020-07-20 21:30:10,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:30:10,426 INFO L225 Difference]: With dead ends: 332 [2020-07-20 21:30:10,427 INFO L226 Difference]: Without dead ends: 315 [2020-07-20 21:30:10,430 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3390 GetRequests, 3341 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:30:10,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2020-07-20 21:30:10,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 248. [2020-07-20 21:30:10,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2020-07-20 21:30:10,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 722 transitions. [2020-07-20 21:30:10,468 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 722 transitions. Word has length 1691 [2020-07-20 21:30:10,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:30:10,469 INFO L479 AbstractCegarLoop]: Abstraction has 248 states and 722 transitions. [2020-07-20 21:30:10,469 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:30:10,469 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 722 transitions. [2020-07-20 21:30:10,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1301 [2020-07-20 21:30:10,495 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:30:10,496 INFO L422 BasicCegarLoop]: trace histogram [97, 97, 94, 94, 75, 72, 48, 48, 48, 48, 48, 48, 48, 47, 47, 47, 47, 47, 47, 47, 28, 24, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:30:10,710 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:30:10,711 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:30:10,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:30:10,712 INFO L82 PathProgramCache]: Analyzing trace with hash -774954434, now seen corresponding path program 17 times [2020-07-20 21:30:10,712 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:30:10,712 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1177170228] [2020-07-20 21:30:10,712 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 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:30:12,059 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:30:12,059 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:30:12,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 2431 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:30:12,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:30:12,931 INFO L134 CoverageAnalysis]: Checked inductivity of 50275 backedges. 804 proven. 3162 refuted. 0 times theorem prover too weak. 46309 trivial. 0 not checked. [2020-07-20 21:30:12,932 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:30:14,660 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:30:28,088 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:32,874 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:32,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:35,462 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:36,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:36,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:36,737 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:37,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:37,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:37,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:38,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:40,291 INFO L134 CoverageAnalysis]: Checked inductivity of 50275 backedges. 806 proven. 3190 refuted. 0 times theorem prover too weak. 46279 trivial. 0 not checked. [2020-07-20 21:30:40,291 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1177170228] [2020-07-20 21:30:40,291 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:30:40,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 21:30:40,292 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214894823] [2020-07-20 21:30:40,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:30:40,294 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:30:40,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:30:40,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:30:40,294 INFO L87 Difference]: Start difference. First operand 248 states and 722 transitions. Second operand 21 states. [2020-07-20 21:30:41,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:30:41,647 INFO L93 Difference]: Finished difference Result 400 states and 1594 transitions. [2020-07-20 21:30:41,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:30:41,653 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1300 [2020-07-20 21:30:41,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:30:41,663 INFO L225 Difference]: With dead ends: 400 [2020-07-20 21:30:41,663 INFO L226 Difference]: Without dead ends: 383 [2020-07-20 21:30:41,668 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2607 GetRequests, 2563 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:30:41,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 383 states. [2020-07-20 21:30:41,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 383 to 238. [2020-07-20 21:30:41,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2020-07-20 21:30:41,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 653 transitions. [2020-07-20 21:30:41,731 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 653 transitions. Word has length 1300 [2020-07-20 21:30:41,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:30:41,732 INFO L479 AbstractCegarLoop]: Abstraction has 238 states and 653 transitions. [2020-07-20 21:30:41,733 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:30:41,733 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 653 transitions. [2020-07-20 21:30:41,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 912 [2020-07-20 21:30:41,749 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:30:41,750 INFO L422 BasicCegarLoop]: trace histogram [69, 69, 64, 64, 54, 52, 34, 34, 34, 34, 34, 34, 34, 32, 32, 32, 32, 32, 32, 32, 20, 20, 17, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:30:41,964 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:30:41,965 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:30:41,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:30:41,966 INFO L82 PathProgramCache]: Analyzing trace with hash 1080916047, now seen corresponding path program 18 times [2020-07-20 21:30:41,967 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:30:41,967 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2036913907] [2020-07-20 21:30:41,967 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 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:30:43,093 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:30:43,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:30:43,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 1704 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 21:30:43,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:30:43,675 INFO L134 CoverageAnalysis]: Checked inductivity of 24433 backedges. 665 proven. 1763 refuted. 0 times theorem prover too weak. 22005 trivial. 0 not checked. [2020-07-20 21:30:43,676 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:30:56,228 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:56,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:00,616 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:00,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:02,841 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:02,842 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:03,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:04,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:04,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:04,474 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:05,013 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:06,806 INFO L134 CoverageAnalysis]: Checked inductivity of 24433 backedges. 665 proven. 1789 refuted. 0 times theorem prover too weak. 21979 trivial. 0 not checked. [2020-07-20 21:31:06,807 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2036913907] [2020-07-20 21:31:06,807 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:31:06,807 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 21:31:06,807 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872623012] [2020-07-20 21:31:06,808 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 21:31:06,808 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:31:06,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 21:31:06,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:31:06,809 INFO L87 Difference]: Start difference. First operand 238 states and 653 transitions. Second operand 19 states. [2020-07-20 21:31:08,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:31:08,020 INFO L93 Difference]: Finished difference Result 489 states and 2374 transitions. [2020-07-20 21:31:08,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 21:31:08,027 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 911 [2020-07-20 21:31:08,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:31:08,041 INFO L225 Difference]: With dead ends: 489 [2020-07-20 21:31:08,041 INFO L226 Difference]: Without dead ends: 472 [2020-07-20 21:31:08,048 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1828 GetRequests, 1789 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 21:31:08,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2020-07-20 21:31:08,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 240. [2020-07-20 21:31:08,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240 states. [2020-07-20 21:31:08,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 667 transitions. [2020-07-20 21:31:08,130 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 667 transitions. Word has length 911 [2020-07-20 21:31:08,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:31:08,131 INFO L479 AbstractCegarLoop]: Abstraction has 240 states and 667 transitions. [2020-07-20 21:31:08,131 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 21:31:08,131 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 667 transitions. [2020-07-20 21:31:08,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1653 [2020-07-20 21:31:08,157 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:31:08,158 INFO L422 BasicCegarLoop]: trace histogram [122, 122, 121, 121, 95, 92, 61, 61, 61, 61, 61, 61, 61, 60, 60, 60, 60, 60, 60, 60, 34, 32, 30, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:31:08,358 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:31:08,359 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:31:08,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:31:08,360 INFO L82 PathProgramCache]: Analyzing trace with hash -788530402, now seen corresponding path program 19 times [2020-07-20 21:31:08,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:31:08,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1816284602] [2020-07-20 21:31:08,362 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 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:31:09,728 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:31:09,728 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:31:09,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 3089 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:31:09,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:31:11,215 INFO L134 CoverageAnalysis]: Checked inductivity of 81615 backedges. 942 proven. 4154 refuted. 0 times theorem prover too weak. 76519 trivial. 0 not checked. [2020-07-20 21:31:11,216 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:31:16,870 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:31:16,981 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:31:17,104 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 21:31:17,226 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 21:31:17,340 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 21:31:17,447 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 21:31:37,758 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:31:38,063 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:31:38,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:46,911 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:50,900 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:51,995 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:51,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:52,867 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:53,278 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:53,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:53,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:53,783 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:54,566 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:58,396 INFO L134 CoverageAnalysis]: Checked inductivity of 81615 backedges. 942 proven. 4186 refuted. 0 times theorem prover too weak. 76487 trivial. 0 not checked. [2020-07-20 21:31:58,396 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1816284602] [2020-07-20 21:31:58,397 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:31:58,397 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 21:31:58,397 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891365240] [2020-07-20 21:31:58,398 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:31:58,399 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:31:58,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:31:58,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:31:58,399 INFO L87 Difference]: Start difference. First operand 240 states and 667 transitions. Second operand 21 states. [2020-07-20 21:31:59,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:31:59,798 INFO L93 Difference]: Finished difference Result 357 states and 1259 transitions. [2020-07-20 21:31:59,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:31:59,805 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1652 [2020-07-20 21:31:59,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:31:59,813 INFO L225 Difference]: With dead ends: 357 [2020-07-20 21:31:59,814 INFO L226 Difference]: Without dead ends: 340 [2020-07-20 21:31:59,818 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3311 GetRequests, 3267 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:31:59,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2020-07-20 21:31:59,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 226. [2020-07-20 21:31:59,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 226 states. [2020-07-20 21:31:59,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 608 transitions. [2020-07-20 21:31:59,863 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 608 transitions. Word has length 1652 [2020-07-20 21:31:59,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:31:59,864 INFO L479 AbstractCegarLoop]: Abstraction has 226 states and 608 transitions. [2020-07-20 21:31:59,864 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:31:59,864 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 608 transitions. [2020-07-20 21:31:59,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1007 [2020-07-20 21:31:59,876 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:31:59,876 INFO L422 BasicCegarLoop]: trace histogram [76, 76, 71, 71, 59, 58, 38, 38, 38, 38, 38, 38, 38, 35, 35, 35, 35, 35, 35, 35, 24, 20, 17, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:32:00,077 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:32:00,077 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:32:00,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:32:00,079 INFO L82 PathProgramCache]: Analyzing trace with hash 369026352, now seen corresponding path program 20 times [2020-07-20 21:32:00,079 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:32:00,079 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [772806668] [2020-07-20 21:32:00,080 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 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:32:01,320 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:32:01,321 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:32:01,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 1883 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 21:32:01,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:32:02,059 INFO L134 CoverageAnalysis]: Checked inductivity of 29896 backedges. 741 proven. 1944 refuted. 0 times theorem prover too weak. 27211 trivial. 0 not checked. [2020-07-20 21:32:02,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:32:05,551 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:32:06,886 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:32:06,998 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:32:07,120 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 21:32:07,241 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 21:32:07,358 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 21:32:07,464 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:32:17,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:21,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:21,815 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:24,907 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:25,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:25,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:26,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:26,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:26,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:26,380 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:26,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:27,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:30,163 INFO L134 CoverageAnalysis]: Checked inductivity of 29896 backedges. 743 proven. 1966 refuted. 0 times theorem prover too weak. 27187 trivial. 0 not checked. [2020-07-20 21:32:30,163 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [772806668] [2020-07-20 21:32:30,163 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:32:30,164 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-20 21:32:30,164 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [7613436] [2020-07-20 21:32:30,165 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 21:32:30,165 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:32:30,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 21:32:30,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:32:30,166 INFO L87 Difference]: Start difference. First operand 226 states and 608 transitions. Second operand 19 states. [2020-07-20 21:32:31,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:32:31,870 INFO L93 Difference]: Finished difference Result 401 states and 1624 transitions. [2020-07-20 21:32:31,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 21:32:31,878 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 1006 [2020-07-20 21:32:31,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:32:31,895 INFO L225 Difference]: With dead ends: 401 [2020-07-20 21:32:31,896 INFO L226 Difference]: Without dead ends: 383 [2020-07-20 21:32:31,901 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2018 GetRequests, 1979 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-20 21:32:31,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 383 states. [2020-07-20 21:32:31,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 383 to 239. [2020-07-20 21:32:31,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 239 states. [2020-07-20 21:32:31,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 665 transitions. [2020-07-20 21:32:31,982 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 665 transitions. Word has length 1006 [2020-07-20 21:32:31,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:32:31,983 INFO L479 AbstractCegarLoop]: Abstraction has 239 states and 665 transitions. [2020-07-20 21:32:31,983 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 21:32:31,984 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 665 transitions. [2020-07-20 21:32:32,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2206 [2020-07-20 21:32:32,045 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:32:32,046 INFO L422 BasicCegarLoop]: trace histogram [176, 176, 151, 151, 118, 118, 88, 88, 88, 88, 88, 88, 88, 75, 75, 75, 75, 75, 75, 75, 58, 43, 33, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:32:32,261 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:32:32,262 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:32:32,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:32:32,263 INFO L82 PathProgramCache]: Analyzing trace with hash -1721628598, now seen corresponding path program 21 times [2020-07-20 21:32:32,263 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:32:32,263 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1311044412] [2020-07-20 21:32:32,263 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 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:32:34,126 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:32:34,126 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:32:34,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 4133 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:32:34,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:32:36,587 INFO L134 CoverageAnalysis]: Checked inductivity of 147118 backedges. 1382 proven. 6435 refuted. 0 times theorem prover too weak. 139301 trivial. 0 not checked. [2020-07-20 21:32:36,587 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:32:38,768 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 21:32:38,881 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:32:38,994 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:32:40,096 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:32:40,205 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:32:40,328 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:32:40,446 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:32:42,413 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:32:42,548 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:32:42,695 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:32:42,828 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:32:46,055 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:32:46,205 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:32:46,377 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 21:32:46,525 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 21:32:46,669 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 21:32:46,811 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 21:32:46,935 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 21:33:10,426 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 21:33:10,538 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 21:33:10,660 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:33:10,778 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:33:13,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:13,911 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:23,656 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:23,657 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:27,360 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:27,361 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:28,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:28,321 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:29,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:29,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:29,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:29,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:30,169 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:30,170 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:30,332 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:30,333 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:30,436 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:30,516 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:30,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:34,872 INFO L134 CoverageAnalysis]: Checked inductivity of 147118 backedges. 1388 proven. 6479 refuted. 0 times theorem prover too weak. 139251 trivial. 0 not checked. [2020-07-20 21:33:34,873 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1311044412] [2020-07-20 21:33:34,873 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:33:34,874 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 24 [2020-07-20 21:33:34,874 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [60299859] [2020-07-20 21:33:34,877 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 21:33:34,877 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:33:34,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 21:33:34,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2020-07-20 21:33:34,878 INFO L87 Difference]: Start difference. First operand 239 states and 665 transitions. Second operand 24 states. [2020-07-20 21:33:36,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:33:36,760 INFO L93 Difference]: Finished difference Result 490 states and 2196 transitions. [2020-07-20 21:33:36,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:33:36,765 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 2205 [2020-07-20 21:33:36,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:33:36,779 INFO L225 Difference]: With dead ends: 490 [2020-07-20 21:33:36,779 INFO L226 Difference]: Without dead ends: 447 [2020-07-20 21:33:36,783 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4418 GetRequests, 4369 SyntacticMatches, 18 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 276 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=205, Invalid=851, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 21:33:36,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 447 states. [2020-07-20 21:33:36,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 447 to 267. [2020-07-20 21:33:36,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 267 states. [2020-07-20 21:33:36,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 783 transitions. [2020-07-20 21:33:36,830 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 783 transitions. Word has length 2205 [2020-07-20 21:33:36,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:33:36,831 INFO L479 AbstractCegarLoop]: Abstraction has 267 states and 783 transitions. [2020-07-20 21:33:36,831 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 21:33:36,831 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 783 transitions. [2020-07-20 21:33:36,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1198 [2020-07-20 21:33:36,850 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:33:36,850 INFO L422 BasicCegarLoop]: trace histogram [90, 90, 85, 85, 75, 65, 45, 45, 45, 45, 45, 45, 45, 42, 42, 42, 42, 42, 42, 42, 30, 25, 23, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:33:37,051 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:33:37,052 INFO L427 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:33:37,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:33:37,053 INFO L82 PathProgramCache]: Analyzing trace with hash -1286340664, now seen corresponding path program 22 times [2020-07-20 21:33:37,053 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:33:37,054 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1084697812] [2020-07-20 21:33:37,054 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 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:33:38,523 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:33:38,524 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:33:38,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 2241 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:33:38,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:33:39,708 INFO L134 CoverageAnalysis]: Checked inductivity of 42559 backedges. 774 proven. 3384 refuted. 0 times theorem prover too weak. 38401 trivial. 0 not checked. [2020-07-20 21:33:39,709 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:33:43,187 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:33:43,298 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:33:44,033 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:33:44,142 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:33:44,262 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 21:33:44,382 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 21:33:44,494 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 21:33:44,598 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 21:33:51,803 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:33:51,915 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:33:52,024 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 21:33:52,539 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:52,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:58,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:33:58,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:03,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:05,049 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 21:34:05,332 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:07,300 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:08,516 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:09,062 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:09,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:09,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:09,565 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:09,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:10,726 INFO L134 CoverageAnalysis]: Checked inductivity of 42559 backedges. 786 proven. 3416 refuted. 0 times theorem prover too weak. 38357 trivial. 0 not checked. [2020-07-20 21:34:10,727 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1084697812] [2020-07-20 21:34:10,727 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:34:10,728 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 21:34:10,728 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156650969] [2020-07-20 21:34:10,730 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:34:10,730 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:34:10,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:34:10,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:34:10,731 INFO L87 Difference]: Start difference. First operand 267 states and 783 transitions. Second operand 23 states. [2020-07-20 21:34:13,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:34:13,356 INFO L93 Difference]: Finished difference Result 671 states and 3658 transitions. [2020-07-20 21:34:13,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:34:13,364 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1197 [2020-07-20 21:34:13,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:34:13,379 INFO L225 Difference]: With dead ends: 671 [2020-07-20 21:34:13,380 INFO L226 Difference]: Without dead ends: 434 [2020-07-20 21:34:13,391 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2402 GetRequests, 2353 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:34:13,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2020-07-20 21:34:13,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 264. [2020-07-20 21:34:13,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 264 states. [2020-07-20 21:34:13,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 767 transitions. [2020-07-20 21:34:13,450 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 767 transitions. Word has length 1197 [2020-07-20 21:34:13,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:34:13,450 INFO L479 AbstractCegarLoop]: Abstraction has 264 states and 767 transitions. [2020-07-20 21:34:13,451 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:34:13,451 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 767 transitions. [2020-07-20 21:34:13,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1338 [2020-07-20 21:34:13,473 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:34:13,474 INFO L422 BasicCegarLoop]: trace histogram [100, 100, 97, 97, 75, 73, 50, 50, 50, 50, 50, 50, 50, 48, 48, 48, 48, 48, 48, 48, 27, 25, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:34:13,674 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:34:13,675 INFO L427 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:34:13,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:34:13,676 INFO L82 PathProgramCache]: Analyzing trace with hash 1449670223, now seen corresponding path program 23 times [2020-07-20 21:34:13,677 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:34:13,677 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [269611398] [2020-07-20 21:34:13,678 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 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:34:15,137 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:34:15,137 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:34:15,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 2506 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:34:15,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:34:16,538 INFO L134 CoverageAnalysis]: Checked inductivity of 53239 backedges. 1138 proven. 3524 refuted. 0 times theorem prover too weak. 48577 trivial. 0 not checked. [2020-07-20 21:34:16,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:34:18,970 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-20 21:34:19,080 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-20 21:34:19,200 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 21:34:19,319 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 21:34:19,449 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 21:34:19,580 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 21:34:19,710 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:34:19,849 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:34:21,496 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:34:21,637 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:34:21,788 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:34:21,939 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:34:22,894 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:34:23,049 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:34:23,210 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:34:23,371 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:34:25,730 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:34:25,892 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:34:26,050 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 21:34:26,205 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 21:34:26,351 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 21:34:26,501 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 21:34:26,625 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 21:34:26,748 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 21:34:26,875 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 21:34:27,002 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 21:34:27,123 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:34:27,235 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 21:34:27,339 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 21:34:42,043 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 21:34:42,159 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 21:34:42,280 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 21:34:42,399 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:34:42,528 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:34:44,039 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:34:44,175 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:34:44,322 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:34:44,465 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:34:45,324 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:34:45,459 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:34:45,604 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:34:45,753 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:34:45,917 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 21:34:46,041 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 21:34:46,184 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 21:34:46,297 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 21:34:46,413 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 21:34:46,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:52,784 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:34:52,898 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:34:53,031 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:34:53,176 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:34:53,314 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 21:34:53,442 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 21:34:53,549 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 21:34:53,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:53,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:03,324 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-20 21:35:03,428 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-20 21:35:03,543 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 21:35:03,654 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 21:35:03,781 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 21:35:03,906 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 21:35:04,041 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:35:04,173 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:35:04,300 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 21:35:04,414 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 21:35:04,522 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:35:04,633 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:04,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:06,268 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-20 21:35:06,375 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-20 21:35:06,494 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 21:35:06,611 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 21:35:06,727 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:35:06,847 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:06,848 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:08,652 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 25 [2020-07-20 21:35:08,874 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:08,874 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:09,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:10,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:10,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:11,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:12,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:15,801 INFO L134 CoverageAnalysis]: Checked inductivity of 53239 backedges. 1142 proven. 3566 refuted. 0 times theorem prover too weak. 48531 trivial. 0 not checked. [2020-07-20 21:35:15,801 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [269611398] [2020-07-20 21:35:15,802 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:35:15,802 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-20 21:35:15,803 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1789607572] [2020-07-20 21:35:15,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:35:15,805 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:15,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:35:15,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:35:15,806 INFO L87 Difference]: Start difference. First operand 264 states and 767 transitions. Second operand 23 states. [2020-07-20 21:35:18,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:18,714 INFO L93 Difference]: Finished difference Result 404 states and 1493 transitions. [2020-07-20 21:35:18,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:35:18,723 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1337 [2020-07-20 21:35:18,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:18,732 INFO L225 Difference]: With dead ends: 404 [2020-07-20 21:35:18,733 INFO L226 Difference]: Without dead ends: 361 [2020-07-20 21:35:18,737 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2682 GetRequests, 2633 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:35:18,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 361 states. [2020-07-20 21:35:18,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 361 to 241. [2020-07-20 21:35:18,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 241 states. [2020-07-20 21:35:18,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 688 transitions. [2020-07-20 21:35:18,798 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 688 transitions. Word has length 1337 [2020-07-20 21:35:18,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:18,798 INFO L479 AbstractCegarLoop]: Abstraction has 241 states and 688 transitions. [2020-07-20 21:35:18,798 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:35:18,799 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 688 transitions. [2020-07-20 21:35:18,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1207 [2020-07-20 21:35:18,814 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:18,815 INFO L422 BasicCegarLoop]: trace histogram [89, 89, 88, 88, 69, 68, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 25, 24, 21, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:35:19,015 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:19,016 INFO L427 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:19,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:19,017 INFO L82 PathProgramCache]: Analyzing trace with hash 1108703803, now seen corresponding path program 24 times [2020-07-20 21:35:19,018 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:19,018 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [980771846] [2020-07-20 21:35:19,018 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 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:20,615 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:35:20,616 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:20,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 2258 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:35:20,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:21,725 INFO L134 CoverageAnalysis]: Checked inductivity of 43168 backedges. 831 proven. 2834 refuted. 0 times theorem prover too weak. 39503 trivial. 0 not checked. [2020-07-20 21:35:21,725 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:35:23,929 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-20 21:35:24,140 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 21:35:24,254 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 21:35:24,855 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 21:35:24,982 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 21:35:25,117 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:35:25,252 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:35:26,268 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:35:26,417 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:35:26,576 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:35:26,734 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:35:29,751 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:35:29,908 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:35:30,073 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 21:35:30,240 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 21:35:30,407 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 21:35:30,561 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 21:35:30,704 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 21:35:30,837 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:35:30,959 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 21:35:31,073 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2020-07-20 21:35:47,269 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 21:35:49,564 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 21:35:49,679 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 21:35:50,260 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 21:35:50,378 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 21:35:50,517 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:35:50,653 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:35:51,602 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:35:51,738 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:35:51,904 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:35:52,068 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:35:52,222 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 21:35:52,359 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 21:35:52,489 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 21:35:52,609 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 21:35:52,720 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:35:52,843 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:58,588 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-20 21:35:58,699 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-20 21:35:58,818 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 21:35:58,940 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 21:35:59,566 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 21:35:59,694 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 21:35:59,835 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:35:59,974 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 21:36:00,104 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 21:36:00,231 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 21:36:00,341 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 21:36:00,473 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:00,473 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:04,511 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-20 21:36:04,619 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-20 21:36:04,736 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 21:36:04,855 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 21:36:04,968 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 21:36:05,096 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:06,238 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2020-07-20 21:36:06,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:06,668 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:07,522 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:08,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:08,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:08,493 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:08,972 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:10,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:13,416 INFO L134 CoverageAnalysis]: Checked inductivity of 43168 backedges. 835 proven. 2860 refuted. 0 times theorem prover too weak. 39473 trivial. 0 not checked. [2020-07-20 21:36:13,416 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [980771846] [2020-07-20 21:36:13,417 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:13,417 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-20 21:36:13,417 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143220946] [2020-07-20 21:36:13,418 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:36:13,418 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:13,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:36:13,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:36:13,420 INFO L87 Difference]: Start difference. First operand 241 states and 688 transitions. Second operand 21 states. [2020-07-20 21:36:15,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:15,383 INFO L93 Difference]: Finished difference Result 327 states and 1046 transitions. [2020-07-20 21:36:15,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:36:15,392 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1206 [2020-07-20 21:36:15,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:15,399 INFO L225 Difference]: With dead ends: 327 [2020-07-20 21:36:15,399 INFO L226 Difference]: Without dead ends: 307 [2020-07-20 21:36:15,402 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2419 GetRequests, 2375 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:36:15,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 307 states. [2020-07-20 21:36:15,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 307 to 225. [2020-07-20 21:36:15,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 225 states. [2020-07-20 21:36:15,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 587 transitions. [2020-07-20 21:36:15,446 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 587 transitions. Word has length 1206 [2020-07-20 21:36:15,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:15,447 INFO L479 AbstractCegarLoop]: Abstraction has 225 states and 587 transitions. [2020-07-20 21:36:15,447 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:36:15,447 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 587 transitions. [2020-07-20 21:36:15,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1304 [2020-07-20 21:36:15,476 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:15,477 INFO L422 BasicCegarLoop]: trace histogram [96, 96, 95, 95, 75, 75, 48, 48, 48, 48, 48, 48, 48, 47, 47, 47, 47, 47, 47, 47, 28, 27, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:15,691 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:15,692 INFO L427 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:15,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:15,693 INFO L82 PathProgramCache]: Analyzing trace with hash 2071376542, now seen corresponding path program 25 times [2020-07-20 21:36:15,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:15,694 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1363028435] [2020-07-20 21:36:15,694 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 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in