/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_6-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 21:35:58,855 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-20 21:35:58,873 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 21:35:58,874 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 21:35:58,875 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 21:35:58,877 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 21:35:58,879 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 21:35:58,880 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 21:35:58,881 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 21:35:58,882 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 21:35:58,882 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 21:35:58,883 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 21:35:58,884 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 21:35:58,886 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 21:35:58,887 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 21:35:58,888 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 21:35:58,890 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 21:35:58,892 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 21:35:58,894 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 21:35:58,895 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 21:35:58,896 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 21:35:58,897 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 21:35:58,900 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 21:35:58,908 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 21:35:58,909 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 21:35:58,910 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 21:35:58,910 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 21:35:58,925 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 21:35:58,925 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 21:35:58,927 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 21:35:58,927 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 21:35:58,927 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 21:35:58,928 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 21:35:58,928 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 21:35:58,928 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 21:35:58,928 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 21:35:58,928 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 21:35:58,928 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 21:35:58,929 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 21:35:58,929 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 21:35:58,929 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 21:35:58,929 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 21:35:58,930 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 21:35:58,930 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 21:35:58,930 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 21:35:58,930 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 21:35:58,930 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 21:35:58,931 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 21:35:58,931 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:35:58,931 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 21:35:58,931 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 21:35:58,931 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 21:35:58,932 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 21:35:58,932 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:58,932 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 21:35:58,932 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 21:35:58,932 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 21:35:59,238 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 21:35:59,251 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 21:35:59,254 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 21:35:59,255 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 21:35:59,256 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 21:35:59,256 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_6-2.c [2020-07-20 21:35:59,334 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/92e363127/ccbe1746e83b4fee8201d07ba41d8306/FLAG6ac8e3b17 [2020-07-20 21:35:59,825 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 21:35:59,827 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_6-2.c [2020-07-20 21:35:59,834 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/92e363127/ccbe1746e83b4fee8201d07ba41d8306/FLAG6ac8e3b17 [2020-07-20 21:36:00,262 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/92e363127/ccbe1746e83b4fee8201d07ba41d8306 [2020-07-20 21:36:00,270 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 21:36:00,274 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 21:36:00,275 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 21:36:00,276 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 21:36:00,279 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 21:36:00,280 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:36:00" (1/1) ... [2020-07-20 21:36:00,284 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3d363db0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:00, skipping insertion in model container [2020-07-20 21:36:00,284 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:36:00" (1/1) ... [2020-07-20 21:36:00,292 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 21:36:00,310 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 21:36:00,485 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:36:00,490 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 21:36:00,507 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:36:00,522 INFO L208 MainTranslator]: Completed translation [2020-07-20 21:36:00,522 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:00 WrapperNode [2020-07-20 21:36:00,522 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 21:36:00,523 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 21:36:00,523 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 21:36:00,524 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 21:36:00,534 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:00" (1/1) ... [2020-07-20 21:36:00,535 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:00" (1/1) ... [2020-07-20 21:36:00,615 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:00" (1/1) ... [2020-07-20 21:36:00,616 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:00" (1/1) ... [2020-07-20 21:36:00,620 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:00" (1/1) ... [2020-07-20 21:36:00,622 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:00" (1/1) ... [2020-07-20 21:36:00,623 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:00" (1/1) ... [2020-07-20 21:36:00,625 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 21:36:00,626 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 21:36:00,626 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 21:36:00,626 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 21:36:00,627 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:00" (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 21:36:00,685 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 21:36:00,685 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 21:36:00,686 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-20 21:36:00,686 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-20 21:36:00,686 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 21:36:00,686 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 21:36:00,686 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 21:36:00,686 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-20 21:36:00,686 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-20 21:36:00,687 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 21:36:00,687 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 21:36:00,687 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 21:36:00,888 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 21:36:00,888 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 21:36:00,893 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:36:00 BoogieIcfgContainer [2020-07-20 21:36:00,894 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 21:36:00,895 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 21:36:00,895 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 21:36:00,898 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 21:36:00,899 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 09:36:00" (1/3) ... [2020-07-20 21:36:00,900 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@171183e8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:36:00, skipping insertion in model container [2020-07-20 21:36:00,900 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:36:00" (2/3) ... [2020-07-20 21:36:00,900 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@171183e8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:36:00, skipping insertion in model container [2020-07-20 21:36:00,900 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:36:00" (3/3) ... [2020-07-20 21:36:00,902 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_6-2.c [2020-07-20 21:36:00,913 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 21:36:00,921 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 21:36:00,937 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 21:36:00,987 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 21:36:00,988 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 21:36:00,988 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 21:36:00,988 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 21:36:00,989 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 21:36:00,989 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 21:36:00,989 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 21:36:00,989 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 21:36:01,030 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 21:36:01,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 21:36:01,039 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:01,040 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:01,041 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:01,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:01,048 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-20 21:36:01,060 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:01,061 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [409412293] [2020-07-20 21:36:01,061 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 21:36:01,117 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:36:01,117 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:01,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:36:01,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:01,225 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 21:36:01,225 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:36:01,226 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [409412293] [2020-07-20 21:36:01,227 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:36:01,227 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:36:01,228 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944632694] [2020-07-20 21:36:01,233 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:36:01,233 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:01,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:36:01,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:36:01,246 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-20 21:36:01,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:01,357 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-20 21:36:01,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:36:01,359 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 21:36:01,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:01,371 INFO L225 Difference]: With dead ends: 44 [2020-07-20 21:36:01,372 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 21:36:01,376 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 21:36:01,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 21:36:01,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 21:36:01,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 21:36:01,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 21:36:01,428 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-20 21:36:01,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:01,429 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 21:36:01,429 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:36:01,429 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 21:36:01,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 21:36:01,432 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:01,432 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:01,646 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:01,646 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:01,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:01,647 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-20 21:36:01,648 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:01,649 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [73749759] [2020-07-20 21:36:01,649 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 21:36:01,676 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:36:01,677 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:01,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:36:01,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:01,706 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 21:36:01,707 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:36:01,707 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [73749759] [2020-07-20 21:36:01,708 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:36:01,708 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:36:01,708 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236538990] [2020-07-20 21:36:01,710 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:36:01,710 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:01,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:36:01,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:36:01,711 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-20 21:36:01,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:01,805 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 21:36:01,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:36:01,806 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 21:36:01,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:01,808 INFO L225 Difference]: With dead ends: 36 [2020-07-20 21:36:01,808 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 21:36:01,811 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 21:36:01,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 21:36:01,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 21:36:01,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 21:36:01,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 21:36:01,832 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-20 21:36:01,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:01,833 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 21:36:01,833 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:36:01,833 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 21:36:01,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 21:36:01,837 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:01,838 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 21:36:02,039 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:02,040 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:02,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:02,041 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-20 21:36:02,042 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:02,042 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [347338616] [2020-07-20 21:36:02,043 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 21:36:02,074 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:36:02,075 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:02,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:36:02,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:02,137 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 21:36:02,142 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:02,363 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:02,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:02,416 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 21:36:02,417 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [347338616] [2020-07-20 21:36:02,417 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:02,419 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 21:36:02,420 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500910167] [2020-07-20 21:36:02,420 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 21:36:02,421 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:02,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 21:36:02,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 21:36:02,422 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-20 21:36:02,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:02,567 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-20 21:36:02,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 21:36:02,567 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 21:36:02,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:02,570 INFO L225 Difference]: With dead ends: 41 [2020-07-20 21:36:02,570 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 21:36:02,571 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 21:36:02,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 21:36:02,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-20 21:36:02,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 21:36:02,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 21:36:02,580 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-20 21:36:02,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:02,581 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 21:36:02,581 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 21:36:02,581 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 21:36:02,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 21:36:02,583 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:02,583 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 21:36:02,797 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:02,798 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:02,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:02,799 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-20 21:36:02,800 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:02,800 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1088809564] [2020-07-20 21:36:02,801 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 21:36:02,829 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:36:02,830 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:02,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:36:02,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:02,892 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 21:36:02,893 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:03,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:03,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:03,097 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 21:36:03,098 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1088809564] [2020-07-20 21:36:03,098 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:03,098 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 21:36:03,098 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138015605] [2020-07-20 21:36:03,099 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 21:36:03,101 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:03,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 21:36:03,102 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 21:36:03,102 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-20 21:36:03,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:03,236 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-20 21:36:03,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 21:36:03,237 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 21:36:03,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:03,239 INFO L225 Difference]: With dead ends: 46 [2020-07-20 21:36:03,240 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 21:36:03,240 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 21:36:03,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 21:36:03,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-20 21:36:03,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 21:36:03,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 21:36:03,252 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-20 21:36:03,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:03,253 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 21:36:03,253 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 21:36:03,253 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 21:36:03,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 21:36:03,255 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:03,255 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 21:36:03,467 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:03,468 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:03,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:03,469 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-20 21:36:03,470 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:03,470 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [196483064] [2020-07-20 21:36:03,471 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 21:36:03,503 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:03,504 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:03,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:36:03,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:03,589 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 21:36:03,589 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:03,856 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:03,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:03,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:03,975 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 21:36:03,975 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [196483064] [2020-07-20 21:36:03,976 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:03,976 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 21:36:03,976 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [487060675] [2020-07-20 21:36:03,977 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 21:36:03,977 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:03,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 21:36:03,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 21:36:03,978 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-20 21:36:04,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:04,159 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-20 21:36:04,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:36:04,160 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-20 21:36:04,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:04,161 INFO L225 Difference]: With dead ends: 51 [2020-07-20 21:36:04,162 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 21:36:04,162 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 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 21:36:04,163 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 21:36:04,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-20 21:36:04,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 21:36:04,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 21:36:04,173 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-20 21:36:04,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:04,173 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 21:36:04,173 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 21:36:04,174 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 21:36:04,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 21:36:04,176 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:04,176 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 21:36:04,378 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:04,379 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:04,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:04,380 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-20 21:36:04,381 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:04,381 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [773566913] [2020-07-20 21:36:04,382 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 21:36:04,412 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:04,412 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:04,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:36:04,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:04,463 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 21:36:04,463 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:04,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:04,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:04,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:04,789 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 21:36:04,790 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [773566913] [2020-07-20 21:36:04,790 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:04,790 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 21:36:04,790 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377927598] [2020-07-20 21:36:04,791 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 21:36:04,791 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:04,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 21:36:04,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 21:36:04,792 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-20 21:36:04,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:04,937 INFO L93 Difference]: Finished difference Result 56 states and 84 transitions. [2020-07-20 21:36:04,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:36:04,938 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-20 21:36:04,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:04,940 INFO L225 Difference]: With dead ends: 56 [2020-07-20 21:36:04,940 INFO L226 Difference]: Without dead ends: 52 [2020-07-20 21:36:04,941 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 21:36:04,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-20 21:36:04,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2020-07-20 21:36:04,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 21:36:04,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 21:36:04,952 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 40 [2020-07-20 21:36:04,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:04,953 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 21:36:04,953 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 21:36:04,953 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 21:36:04,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-20 21:36:04,955 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:04,956 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 21:36:05,168 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:05,169 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:05,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:05,169 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2020-07-20 21:36:05,169 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:05,170 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [903885244] [2020-07-20 21:36:05,170 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 21:36:05,220 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:05,221 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:05,221 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:05,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:05,294 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 21:36:05,295 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:05,655 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:05,656 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:05,752 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:05,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:05,837 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 21:36:05,837 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [903885244] [2020-07-20 21:36:05,837 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:05,837 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 21:36:05,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2101769563] [2020-07-20 21:36:05,838 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 21:36:05,838 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:05,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 21:36:05,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:36:05,839 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 14 states. [2020-07-20 21:36:06,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:06,045 INFO L93 Difference]: Finished difference Result 61 states and 96 transitions. [2020-07-20 21:36:06,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:06,046 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 52 [2020-07-20 21:36:06,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:06,049 INFO L225 Difference]: With dead ends: 61 [2020-07-20 21:36:06,050 INFO L226 Difference]: Without dead ends: 57 [2020-07-20 21:36:06,054 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 86 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 21:36:06,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-20 21:36:06,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2020-07-20 21:36:06,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 21:36:06,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 21:36:06,076 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 52 [2020-07-20 21:36:06,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:06,077 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 21:36:06,077 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 21:36:06,078 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 21:36:06,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-20 21:36:06,083 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:06,083 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 21:36:06,284 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:06,285 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:06,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:06,285 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-20 21:36:06,286 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:06,286 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1659689000] [2020-07-20 21:36:06,287 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 21:36:06,325 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:06,325 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:06,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:06,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:06,405 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 21:36:06,406 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:06,741 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:06,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:06,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:06,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:06,882 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:06,922 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 21:36:06,922 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1659689000] [2020-07-20 21:36:06,923 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:06,923 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 21:36:06,923 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [921432966] [2020-07-20 21:36:06,924 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 21:36:06,924 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:06,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 21:36:06,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:36:06,924 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 14 states. [2020-07-20 21:36:07,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:07,128 INFO L93 Difference]: Finished difference Result 66 states and 110 transitions. [2020-07-20 21:36:07,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:07,129 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 54 [2020-07-20 21:36:07,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:07,132 INFO L225 Difference]: With dead ends: 66 [2020-07-20 21:36:07,132 INFO L226 Difference]: Without dead ends: 62 [2020-07-20 21:36:07,133 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 21:36:07,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-20 21:36:07,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 45. [2020-07-20 21:36:07,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 21:36:07,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 21:36:07,143 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 54 [2020-07-20 21:36:07,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:07,144 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 21:36:07,144 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 21:36:07,144 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 21:36:07,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-20 21:36:07,145 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:07,146 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 21:36:07,351 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:07,352 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:07,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:07,353 INFO L82 PathProgramCache]: Analyzing trace with hash -975547772, now seen corresponding path program 3 times [2020-07-20 21:36:07,353 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:07,354 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1856792947] [2020-07-20 21:36:07,354 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 21:36:07,404 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:07,405 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:07,405 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:36:07,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:07,497 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 21:36:07,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:08,097 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:08,098 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:08,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:08,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:08,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:08,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:08,374 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:08,432 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 21:36:08,433 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1856792947] [2020-07-20 21:36:08,433 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:08,433 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 21:36:08,434 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569205744] [2020-07-20 21:36:08,435 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 21:36:08,436 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:08,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 21:36:08,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 21:36:08,437 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 16 states. [2020-07-20 21:36:08,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:08,687 INFO L93 Difference]: Finished difference Result 71 states and 124 transitions. [2020-07-20 21:36:08,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:08,688 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 78 [2020-07-20 21:36:08,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:08,690 INFO L225 Difference]: With dead ends: 71 [2020-07-20 21:36:08,691 INFO L226 Difference]: Without dead ends: 67 [2020-07-20 21:36:08,692 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 21:36:08,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-20 21:36:08,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 50. [2020-07-20 21:36:08,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 21:36:08,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-20 21:36:08,704 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 78 [2020-07-20 21:36:08,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:08,704 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-20 21:36:08,704 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 21:36:08,704 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-20 21:36:08,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-20 21:36:08,706 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:08,706 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 21:36:08,911 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:08,912 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:08,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:08,913 INFO L82 PathProgramCache]: Analyzing trace with hash 1891337214, now seen corresponding path program 2 times [2020-07-20 21:36:08,913 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:08,914 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [63204663] [2020-07-20 21:36:08,914 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 21:36:08,978 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:08,980 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:08,982 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:36:08,988 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:09,076 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 21:36:09,077 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:09,651 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:09,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:09,862 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:09,908 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:09,961 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 21:36:09,961 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [63204663] [2020-07-20 21:36:09,961 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:09,962 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 21:36:09,962 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1934897211] [2020-07-20 21:36:09,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:36:09,963 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:09,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:36:09,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:09,964 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 15 states. [2020-07-20 21:36:10,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:10,186 INFO L93 Difference]: Finished difference Result 76 states and 140 transitions. [2020-07-20 21:36:10,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:10,186 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 108 [2020-07-20 21:36:10,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:10,188 INFO L225 Difference]: With dead ends: 76 [2020-07-20 21:36:10,188 INFO L226 Difference]: Without dead ends: 72 [2020-07-20 21:36:10,189 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 192 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:36:10,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-20 21:36:10,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 50. [2020-07-20 21:36:10,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 21:36:10,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-20 21:36:10,200 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 108 [2020-07-20 21:36:10,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:10,201 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-20 21:36:10,201 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:36:10,201 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-20 21:36:10,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2020-07-20 21:36:10,204 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:10,205 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 21:36:10,417 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:10,418 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:10,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:10,418 INFO L82 PathProgramCache]: Analyzing trace with hash -815433282, now seen corresponding path program 4 times [2020-07-20 21:36:10,418 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:10,419 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1260123018] [2020-07-20 21:36:10,419 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 21:36:10,521 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:10,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:10,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 21:36:10,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:10,651 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 21:36:10,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:11,692 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:11,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:11,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:12,098 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:12,099 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:12,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:12,224 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:12,225 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:12,279 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 21:36:12,279 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1260123018] [2020-07-20 21:36:12,279 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:12,279 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 21:36:12,280 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [941803419] [2020-07-20 21:36:12,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 21:36:12,281 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:12,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 21:36:12,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:12,281 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 17 states. [2020-07-20 21:36:12,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:12,565 INFO L93 Difference]: Finished difference Result 81 states and 156 transitions. [2020-07-20 21:36:12,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:36:12,566 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 208 [2020-07-20 21:36:12,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:12,568 INFO L225 Difference]: With dead ends: 81 [2020-07-20 21:36:12,568 INFO L226 Difference]: Without dead ends: 77 [2020-07-20 21:36:12,569 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 389 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:36:12,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-07-20 21:36:12,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 55. [2020-07-20 21:36:12,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-20 21:36:12,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-20 21:36:12,583 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 208 [2020-07-20 21:36:12,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:12,589 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-20 21:36:12,589 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 21:36:12,589 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-20 21:36:12,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2020-07-20 21:36:12,591 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:12,591 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:12,808 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:12,809 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:12,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:12,809 INFO L82 PathProgramCache]: Analyzing trace with hash -1298373331, now seen corresponding path program 2 times [2020-07-20 21:36:12,810 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:12,810 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1927112896] [2020-07-20 21:36:12,810 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 21:36:12,904 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:12,905 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:12,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:36:12,910 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:12,989 INFO L134 CoverageAnalysis]: Checked inductivity of 543 backedges. 42 proven. 156 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-20 21:36:12,989 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:13,640 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:13,641 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:13,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:13,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:13,889 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:13,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:13,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:13,969 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:14,014 INFO L134 CoverageAnalysis]: Checked inductivity of 543 backedges. 42 proven. 164 refuted. 0 times theorem prover too weak. 337 trivial. 0 not checked. [2020-07-20 21:36:14,015 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1927112896] [2020-07-20 21:36:14,015 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:14,015 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 21:36:14,015 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [869081607] [2020-07-20 21:36:14,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:36:14,016 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:14,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:36:14,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:14,017 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 15 states. [2020-07-20 21:36:14,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:14,261 INFO L93 Difference]: Finished difference Result 99 states and 221 transitions. [2020-07-20 21:36:14,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:14,265 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 148 [2020-07-20 21:36:14,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:14,267 INFO L225 Difference]: With dead ends: 99 [2020-07-20 21:36:14,267 INFO L226 Difference]: Without dead ends: 95 [2020-07-20 21:36:14,269 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 272 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:36:14,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-07-20 21:36:14,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 57. [2020-07-20 21:36:14,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-20 21:36:14,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 92 transitions. [2020-07-20 21:36:14,293 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 92 transitions. Word has length 148 [2020-07-20 21:36:14,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:14,294 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 92 transitions. [2020-07-20 21:36:14,294 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:36:14,295 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 92 transitions. [2020-07-20 21:36:14,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-07-20 21:36:14,296 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:14,296 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 7, 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 21:36:14,504 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:14,504 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:14,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:14,505 INFO L82 PathProgramCache]: Analyzing trace with hash 2095197631, now seen corresponding path program 1 times [2020-07-20 21:36:14,505 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:14,506 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [579822033] [2020-07-20 21:36:14,506 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 21:36:14,604 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:14,604 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:14,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:14,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:14,666 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 48 proven. 89 refuted. 0 times theorem prover too weak. 221 trivial. 0 not checked. [2020-07-20 21:36:14,667 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:15,091 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:15,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:15,246 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:15,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:15,332 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 48 proven. 94 refuted. 0 times theorem prover too weak. 216 trivial. 0 not checked. [2020-07-20 21:36:15,332 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [579822033] [2020-07-20 21:36:15,333 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:15,333 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 21:36:15,333 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1277482107] [2020-07-20 21:36:15,334 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:36:15,334 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:15,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:36:15,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:36:15,335 INFO L87 Difference]: Start difference. First operand 57 states and 92 transitions. Second operand 13 states. [2020-07-20 21:36:15,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:15,530 INFO L93 Difference]: Finished difference Result 99 states and 217 transitions. [2020-07-20 21:36:15,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:15,531 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 123 [2020-07-20 21:36:15,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:15,533 INFO L225 Difference]: With dead ends: 99 [2020-07-20 21:36:15,534 INFO L226 Difference]: Without dead ends: 95 [2020-07-20 21:36:15,534 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 226 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:15,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-07-20 21:36:15,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 59. [2020-07-20 21:36:15,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-07-20 21:36:15,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 98 transitions. [2020-07-20 21:36:15,550 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 98 transitions. Word has length 123 [2020-07-20 21:36:15,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:15,550 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 98 transitions. [2020-07-20 21:36:15,550 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:36:15,550 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 98 transitions. [2020-07-20 21:36:15,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2020-07-20 21:36:15,554 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:15,554 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 13, 13, 12, 11, 9, 9, 9, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:15,767 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:15,768 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:15,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:15,769 INFO L82 PathProgramCache]: Analyzing trace with hash 1017418174, now seen corresponding path program 1 times [2020-07-20 21:36:15,769 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:15,770 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1517948192] [2020-07-20 21:36:15,770 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 21:36:15,901 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:15,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:15,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 406 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 21:36:15,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:16,039 INFO L134 CoverageAnalysis]: Checked inductivity of 1249 backedges. 114 proven. 290 refuted. 0 times theorem prover too weak. 845 trivial. 0 not checked. [2020-07-20 21:36:16,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:17,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:17,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:17,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:17,516 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:17,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:17,603 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:17,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:17,655 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:17,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:17,749 INFO L134 CoverageAnalysis]: Checked inductivity of 1249 backedges. 116 proven. 304 refuted. 0 times theorem prover too weak. 829 trivial. 0 not checked. [2020-07-20 21:36:17,749 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1517948192] [2020-07-20 21:36:17,750 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:17,750 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 21:36:17,750 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715832786] [2020-07-20 21:36:17,750 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 21:36:17,751 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:17,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 21:36:17,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:17,751 INFO L87 Difference]: Start difference. First operand 59 states and 98 transitions. Second operand 17 states. [2020-07-20 21:36:18,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:18,135 INFO L93 Difference]: Finished difference Result 113 states and 271 transitions. [2020-07-20 21:36:18,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:36:18,136 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 216 [2020-07-20 21:36:18,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:18,138 INFO L225 Difference]: With dead ends: 113 [2020-07-20 21:36:18,138 INFO L226 Difference]: Without dead ends: 67 [2020-07-20 21:36:18,141 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 403 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:36:18,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-20 21:36:18,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2020-07-20 21:36:18,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-07-20 21:36:18,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 104 transitions. [2020-07-20 21:36:18,152 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 104 transitions. Word has length 216 [2020-07-20 21:36:18,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:18,152 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 104 transitions. [2020-07-20 21:36:18,153 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 21:36:18,153 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 104 transitions. [2020-07-20 21:36:18,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-07-20 21:36:18,156 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:18,156 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 7, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:18,369 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:18,370 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:18,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:18,370 INFO L82 PathProgramCache]: Analyzing trace with hash -1521837768, now seen corresponding path program 2 times [2020-07-20 21:36:18,371 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:18,371 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [222869932] [2020-07-20 21:36:18,371 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 21:36:18,483 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:18,484 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:18,485 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:36:18,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:18,555 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 62 proven. 114 refuted. 0 times theorem prover too weak. 254 trivial. 0 not checked. [2020-07-20 21:36:18,555 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:19,147 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:19,148 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:19,303 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:19,388 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:19,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:19,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:19,436 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:19,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:19,514 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 62 proven. 122 refuted. 0 times theorem prover too weak. 246 trivial. 0 not checked. [2020-07-20 21:36:19,514 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [222869932] [2020-07-20 21:36:19,514 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:19,514 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 21:36:19,515 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176371567] [2020-07-20 21:36:19,515 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:36:19,515 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:19,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:36:19,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:19,516 INFO L87 Difference]: Start difference. First operand 67 states and 104 transitions. Second operand 15 states. [2020-07-20 21:36:19,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:19,743 INFO L93 Difference]: Finished difference Result 107 states and 201 transitions. [2020-07-20 21:36:19,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:19,743 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 135 [2020-07-20 21:36:19,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:19,748 INFO L225 Difference]: With dead ends: 107 [2020-07-20 21:36:19,748 INFO L226 Difference]: Without dead ends: 100 [2020-07-20 21:36:19,749 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 245 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:36:19,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-07-20 21:36:19,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 70. [2020-07-20 21:36:19,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-20 21:36:19,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 112 transitions. [2020-07-20 21:36:19,771 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 112 transitions. Word has length 135 [2020-07-20 21:36:19,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:19,771 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 112 transitions. [2020-07-20 21:36:19,771 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:36:19,772 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 112 transitions. [2020-07-20 21:36:19,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2020-07-20 21:36:19,774 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:19,775 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 10, 8, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:19,988 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:19,989 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:19,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:19,989 INFO L82 PathProgramCache]: Analyzing trace with hash 1102424554, now seen corresponding path program 3 times [2020-07-20 21:36:19,990 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:19,990 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [910033892] [2020-07-20 21:36:19,990 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 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 21:36:20,158 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:20,159 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:20,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 21:36:20,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:20,273 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 159 proven. 114 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2020-07-20 21:36:20,273 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:21,172 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:21,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:21,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:21,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:21,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:21,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:21,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:21,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:21,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:21,745 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:21,818 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 159 proven. 130 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-20 21:36:21,818 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [910033892] [2020-07-20 21:36:21,818 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:21,819 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 21:36:21,819 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [206086848] [2020-07-20 21:36:21,819 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 21:36:21,820 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:21,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 21:36:21,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:21,820 INFO L87 Difference]: Start difference. First operand 70 states and 112 transitions. Second operand 17 states. [2020-07-20 21:36:22,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:22,169 INFO L93 Difference]: Finished difference Result 107 states and 197 transitions. [2020-07-20 21:36:22,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:36:22,170 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 163 [2020-07-20 21:36:22,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:22,172 INFO L225 Difference]: With dead ends: 107 [2020-07-20 21:36:22,172 INFO L226 Difference]: Without dead ends: 75 [2020-07-20 21:36:22,173 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 297 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:36:22,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-07-20 21:36:22,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2020-07-20 21:36:22,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-07-20 21:36:22,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 115 transitions. [2020-07-20 21:36:22,181 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 115 transitions. Word has length 163 [2020-07-20 21:36:22,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:22,181 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 115 transitions. [2020-07-20 21:36:22,181 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 21:36:22,182 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 115 transitions. [2020-07-20 21:36:22,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2020-07-20 21:36:22,184 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:22,184 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 8, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:22,398 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:22,399 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:22,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:22,400 INFO L82 PathProgramCache]: Analyzing trace with hash -2102107778, now seen corresponding path program 4 times [2020-07-20 21:36:22,400 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:22,401 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [240753632] [2020-07-20 21:36:22,401 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 21:36:22,521 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:22,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:22,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:22,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:22,615 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 79 proven. 76 refuted. 0 times theorem prover too weak. 282 trivial. 0 not checked. [2020-07-20 21:36:22,616 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:23,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:23,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:23,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:23,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:23,239 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:23,305 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 79 proven. 81 refuted. 0 times theorem prover too weak. 277 trivial. 0 not checked. [2020-07-20 21:36:23,308 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [240753632] [2020-07-20 21:36:23,311 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:23,311 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 21:36:23,312 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1212715945] [2020-07-20 21:36:23,312 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:36:23,312 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:23,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:36:23,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:36:23,313 INFO L87 Difference]: Start difference. First operand 75 states and 115 transitions. Second operand 13 states. [2020-07-20 21:36:23,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:23,491 INFO L93 Difference]: Finished difference Result 107 states and 179 transitions. [2020-07-20 21:36:23,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:23,492 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 136 [2020-07-20 21:36:23,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:23,493 INFO L225 Difference]: With dead ends: 107 [2020-07-20 21:36:23,494 INFO L226 Difference]: Without dead ends: 100 [2020-07-20 21:36:23,495 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 251 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:23,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-07-20 21:36:23,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 82. [2020-07-20 21:36:23,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-07-20 21:36:23,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 136 transitions. [2020-07-20 21:36:23,506 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 136 transitions. Word has length 136 [2020-07-20 21:36:23,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:23,507 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 136 transitions. [2020-07-20 21:36:23,507 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:36:23,507 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 136 transitions. [2020-07-20 21:36:23,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2020-07-20 21:36:23,510 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:23,511 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 8, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:23,723 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:23,724 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:23,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:23,724 INFO L82 PathProgramCache]: Analyzing trace with hash -1316077641, now seen corresponding path program 5 times [2020-07-20 21:36:23,724 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:23,724 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [89506631] [2020-07-20 21:36:23,725 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 21:36:23,853 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:23,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:23,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:36:23,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:23,940 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 106 proven. 98 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2020-07-20 21:36:23,941 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:24,589 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:24,732 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:24,733 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:24,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:24,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:24,931 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:25,003 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 108 proven. 104 refuted. 0 times theorem prover too weak. 317 trivial. 0 not checked. [2020-07-20 21:36:25,003 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [89506631] [2020-07-20 21:36:25,004 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:25,004 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 21:36:25,004 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1942914449] [2020-07-20 21:36:25,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:36:25,005 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:25,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:36:25,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:25,005 INFO L87 Difference]: Start difference. First operand 82 states and 136 transitions. Second operand 15 states. [2020-07-20 21:36:25,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:25,244 INFO L93 Difference]: Finished difference Result 117 states and 203 transitions. [2020-07-20 21:36:25,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:25,245 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 148 [2020-07-20 21:36:25,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:25,247 INFO L225 Difference]: With dead ends: 117 [2020-07-20 21:36:25,247 INFO L226 Difference]: Without dead ends: 110 [2020-07-20 21:36:25,248 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 271 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:36:25,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-20 21:36:25,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 80. [2020-07-20 21:36:25,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-20 21:36:25,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 128 transitions. [2020-07-20 21:36:25,258 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 128 transitions. Word has length 148 [2020-07-20 21:36:25,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:25,258 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 128 transitions. [2020-07-20 21:36:25,259 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:36:25,259 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 128 transitions. [2020-07-20 21:36:25,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2020-07-20 21:36:25,260 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:25,261 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 9, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:25,473 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:25,474 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:25,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:25,475 INFO L82 PathProgramCache]: Analyzing trace with hash -872965087, now seen corresponding path program 6 times [2020-07-20 21:36:25,475 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:25,475 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1575985443] [2020-07-20 21:36:25,476 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 21:36:25,616 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:25,616 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:25,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:25,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:25,683 INFO L134 CoverageAnalysis]: Checked inductivity of 537 backedges. 88 proven. 81 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-20 21:36:25,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:26,113 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:26,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:26,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:26,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:26,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:26,287 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:26,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:26,445 INFO L134 CoverageAnalysis]: Checked inductivity of 537 backedges. 88 proven. 85 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-20 21:36:26,446 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1575985443] [2020-07-20 21:36:26,446 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:26,446 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 21:36:26,446 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1005461241] [2020-07-20 21:36:26,446 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:36:26,447 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:26,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:36:26,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:36:26,447 INFO L87 Difference]: Start difference. First operand 80 states and 128 transitions. Second operand 13 states. [2020-07-20 21:36:26,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:26,631 INFO L93 Difference]: Finished difference Result 114 states and 190 transitions. [2020-07-20 21:36:26,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:26,631 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 149 [2020-07-20 21:36:26,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:26,633 INFO L225 Difference]: With dead ends: 114 [2020-07-20 21:36:26,633 INFO L226 Difference]: Without dead ends: 107 [2020-07-20 21:36:26,634 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 277 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:26,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-07-20 21:36:26,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 80. [2020-07-20 21:36:26,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-20 21:36:26,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 128 transitions. [2020-07-20 21:36:26,644 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 128 transitions. Word has length 149 [2020-07-20 21:36:26,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:26,645 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 128 transitions. [2020-07-20 21:36:26,645 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:36:26,645 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 128 transitions. [2020-07-20 21:36:26,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2020-07-20 21:36:26,647 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:26,647 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 9, 8, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:26,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:26,863 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:26,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:26,863 INFO L82 PathProgramCache]: Analyzing trace with hash -529934979, now seen corresponding path program 7 times [2020-07-20 21:36:26,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:26,863 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [694549250] [2020-07-20 21:36:26,864 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 21:36:27,006 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 21:36:27,006 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:27,007 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:27,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:27,068 INFO L134 CoverageAnalysis]: Checked inductivity of 544 backedges. 141 proven. 34 refuted. 0 times theorem prover too weak. 369 trivial. 0 not checked. [2020-07-20 21:36:27,069 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:27,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:27,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:27,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:27,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:27,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:27,825 INFO L134 CoverageAnalysis]: Checked inductivity of 544 backedges. 143 proven. 37 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-20 21:36:27,825 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [694549250] [2020-07-20 21:36:27,825 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:27,825 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 21:36:27,825 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1549768443] [2020-07-20 21:36:27,826 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:36:27,826 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:27,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:36:27,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:36:27,827 INFO L87 Difference]: Start difference. First operand 80 states and 128 transitions. Second operand 13 states. [2020-07-20 21:36:28,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:28,002 INFO L93 Difference]: Finished difference Result 106 states and 183 transitions. [2020-07-20 21:36:28,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:28,002 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 150 [2020-07-20 21:36:28,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:28,004 INFO L225 Difference]: With dead ends: 106 [2020-07-20 21:36:28,004 INFO L226 Difference]: Without dead ends: 99 [2020-07-20 21:36:28,005 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 279 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:28,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-07-20 21:36:28,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 92. [2020-07-20 21:36:28,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-07-20 21:36:28,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 161 transitions. [2020-07-20 21:36:28,019 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 161 transitions. Word has length 150 [2020-07-20 21:36:28,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:28,020 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 161 transitions. [2020-07-20 21:36:28,020 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:36:28,020 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 161 transitions. [2020-07-20 21:36:28,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2020-07-20 21:36:28,023 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:28,023 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 10, 10, 9, 8, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:28,236 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:28,237 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:28,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:28,238 INFO L82 PathProgramCache]: Analyzing trace with hash 1102006884, now seen corresponding path program 8 times [2020-07-20 21:36:28,238 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:28,239 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2054332459] [2020-07-20 21:36:28,239 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 21:36:28,382 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:28,383 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:28,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:36:28,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:28,487 INFO L134 CoverageAnalysis]: Checked inductivity of 656 backedges. 185 proven. 49 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-20 21:36:28,487 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:29,030 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:29,031 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:29,172 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:29,259 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:29,304 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:29,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:29,375 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:29,516 INFO L134 CoverageAnalysis]: Checked inductivity of 656 backedges. 187 proven. 55 refuted. 0 times theorem prover too weak. 414 trivial. 0 not checked. [2020-07-20 21:36:29,516 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2054332459] [2020-07-20 21:36:29,517 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:29,517 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 21:36:29,517 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123050054] [2020-07-20 21:36:29,517 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:36:29,517 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:29,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:36:29,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:29,518 INFO L87 Difference]: Start difference. First operand 92 states and 161 transitions. Second operand 15 states. [2020-07-20 21:36:29,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:29,726 INFO L93 Difference]: Finished difference Result 117 states and 207 transitions. [2020-07-20 21:36:29,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:29,727 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 162 [2020-07-20 21:36:29,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:29,729 INFO L225 Difference]: With dead ends: 117 [2020-07-20 21:36:29,729 INFO L226 Difference]: Without dead ends: 110 [2020-07-20 21:36:29,730 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 299 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:36:29,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-20 21:36:29,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 96. [2020-07-20 21:36:29,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-07-20 21:36:29,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 158 transitions. [2020-07-20 21:36:29,742 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 158 transitions. Word has length 162 [2020-07-20 21:36:29,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:29,743 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 158 transitions. [2020-07-20 21:36:29,743 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:36:29,743 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 158 transitions. [2020-07-20 21:36:29,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2020-07-20 21:36:29,745 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:29,746 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 10, 10, 10, 8, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:29,960 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:29,961 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:29,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:29,962 INFO L82 PathProgramCache]: Analyzing trace with hash 1920867700, now seen corresponding path program 9 times [2020-07-20 21:36:29,962 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:29,962 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [644862259] [2020-07-20 21:36:29,963 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 21:36:30,123 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 21:36:30,124 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:30,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:30,128 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:30,181 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 149 proven. 37 refuted. 0 times theorem prover too weak. 479 trivial. 0 not checked. [2020-07-20 21:36:30,182 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:30,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:30,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:30,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:30,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:30,732 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:30,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:30,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:30,962 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 149 proven. 43 refuted. 0 times theorem prover too weak. 473 trivial. 0 not checked. [2020-07-20 21:36:30,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [644862259] [2020-07-20 21:36:30,963 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:30,963 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 21:36:30,963 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053312967] [2020-07-20 21:36:30,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:36:30,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:30,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:36:30,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:36:30,964 INFO L87 Difference]: Start difference. First operand 96 states and 158 transitions. Second operand 13 states. [2020-07-20 21:36:31,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:31,150 INFO L93 Difference]: Finished difference Result 129 states and 217 transitions. [2020-07-20 21:36:31,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:31,152 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 163 [2020-07-20 21:36:31,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:31,154 INFO L225 Difference]: With dead ends: 129 [2020-07-20 21:36:31,154 INFO L226 Difference]: Without dead ends: 122 [2020-07-20 21:36:31,155 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 305 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:31,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-07-20 21:36:31,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 93. [2020-07-20 21:36:31,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-07-20 21:36:31,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 149 transitions. [2020-07-20 21:36:31,169 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 149 transitions. Word has length 163 [2020-07-20 21:36:31,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:31,169 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 149 transitions. [2020-07-20 21:36:31,169 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:36:31,169 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 149 transitions. [2020-07-20 21:36:31,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2020-07-20 21:36:31,171 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:31,172 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 10, 10, 10, 9, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:31,385 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:31,386 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:31,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:31,387 INFO L82 PathProgramCache]: Analyzing trace with hash -1607241826, now seen corresponding path program 10 times [2020-07-20 21:36:31,387 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:31,387 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1629101574] [2020-07-20 21:36:31,387 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 21:36:31,559 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 21:36:31,559 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:31,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 366 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:36:31,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:31,615 INFO L134 CoverageAnalysis]: Checked inductivity of 673 backedges. 123 proven. 32 refuted. 0 times theorem prover too weak. 518 trivial. 0 not checked. [2020-07-20 21:36:31,616 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:31,870 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:31,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:31,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:32,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:32,130 INFO L134 CoverageAnalysis]: Checked inductivity of 673 backedges. 123 proven. 34 refuted. 0 times theorem prover too weak. 516 trivial. 0 not checked. [2020-07-20 21:36:32,130 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1629101574] [2020-07-20 21:36:32,131 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:32,131 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-20 21:36:32,131 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1356845467] [2020-07-20 21:36:32,131 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 21:36:32,131 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:32,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 21:36:32,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:36:32,132 INFO L87 Difference]: Start difference. First operand 93 states and 149 transitions. Second operand 11 states. [2020-07-20 21:36:32,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:32,262 INFO L93 Difference]: Finished difference Result 131 states and 225 transitions. [2020-07-20 21:36:32,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:36:32,263 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 164 [2020-07-20 21:36:32,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:32,266 INFO L225 Difference]: With dead ends: 131 [2020-07-20 21:36:32,266 INFO L226 Difference]: Without dead ends: 124 [2020-07-20 21:36:32,267 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 311 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:36:32,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-20 21:36:32,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 95. [2020-07-20 21:36:32,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-07-20 21:36:32,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 157 transitions. [2020-07-20 21:36:32,277 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 157 transitions. Word has length 164 [2020-07-20 21:36:32,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:32,278 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 157 transitions. [2020-07-20 21:36:32,278 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 21:36:32,278 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 157 transitions. [2020-07-20 21:36:32,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2020-07-20 21:36:32,280 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:32,280 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 10, 9, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:32,495 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:32,496 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:32,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:32,496 INFO L82 PathProgramCache]: Analyzing trace with hash -315995755, now seen corresponding path program 11 times [2020-07-20 21:36:32,496 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:32,496 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [129058012] [2020-07-20 21:36:32,497 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 21:36:32,677 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 21:36:32,678 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:32,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 393 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:32,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:32,743 INFO L134 CoverageAnalysis]: Checked inductivity of 777 backedges. 168 proven. 41 refuted. 0 times theorem prover too weak. 568 trivial. 0 not checked. [2020-07-20 21:36:32,744 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:33,148 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:33,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:33,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:33,332 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:33,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:33,553 INFO L134 CoverageAnalysis]: Checked inductivity of 777 backedges. 170 proven. 43 refuted. 0 times theorem prover too weak. 564 trivial. 0 not checked. [2020-07-20 21:36:33,553 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [129058012] [2020-07-20 21:36:33,554 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:33,554 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 21:36:33,554 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2034892019] [2020-07-20 21:36:33,555 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:36:33,555 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:33,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:36:33,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:36:33,556 INFO L87 Difference]: Start difference. First operand 95 states and 157 transitions. Second operand 13 states. [2020-07-20 21:36:33,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:33,723 INFO L93 Difference]: Finished difference Result 110 states and 175 transitions. [2020-07-20 21:36:33,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:33,723 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 176 [2020-07-20 21:36:33,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:33,725 INFO L225 Difference]: With dead ends: 110 [2020-07-20 21:36:33,725 INFO L226 Difference]: Without dead ends: 103 [2020-07-20 21:36:33,726 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 355 GetRequests, 331 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:33,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-20 21:36:33,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 93. [2020-07-20 21:36:33,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-07-20 21:36:33,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 149 transitions. [2020-07-20 21:36:33,735 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 149 transitions. Word has length 176 [2020-07-20 21:36:33,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:33,736 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 149 transitions. [2020-07-20 21:36:33,736 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:36:33,736 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 149 transitions. [2020-07-20 21:36:33,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2020-07-20 21:36:33,738 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:33,738 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 11, 11, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:33,952 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:33,953 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:33,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:33,954 INFO L82 PathProgramCache]: Analyzing trace with hash -854759576, now seen corresponding path program 12 times [2020-07-20 21:36:33,954 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:33,954 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1008964890] [2020-07-20 21:36:33,955 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 21:36:34,127 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 21:36:34,127 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:34,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:36:34,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:34,214 INFO L134 CoverageAnalysis]: Checked inductivity of 938 backedges. 251 proven. 45 refuted. 0 times theorem prover too weak. 642 trivial. 0 not checked. [2020-07-20 21:36:34,214 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:34,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:34,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:35,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:35,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:35,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:35,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:35,317 INFO L134 CoverageAnalysis]: Checked inductivity of 938 backedges. 251 proven. 55 refuted. 0 times theorem prover too weak. 632 trivial. 0 not checked. [2020-07-20 21:36:35,317 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1008964890] [2020-07-20 21:36:35,317 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:35,318 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 21:36:35,318 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1010039227] [2020-07-20 21:36:35,318 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:36:35,318 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:35,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:36:35,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:35,319 INFO L87 Difference]: Start difference. First operand 93 states and 149 transitions. Second operand 15 states. [2020-07-20 21:36:35,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:35,533 INFO L93 Difference]: Finished difference Result 123 states and 202 transitions. [2020-07-20 21:36:35,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:35,533 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 191 [2020-07-20 21:36:35,534 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:35,535 INFO L225 Difference]: With dead ends: 123 [2020-07-20 21:36:35,535 INFO L226 Difference]: Without dead ends: 116 [2020-07-20 21:36:35,536 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 357 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:36:35,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-07-20 21:36:35,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 101. [2020-07-20 21:36:35,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-07-20 21:36:35,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 173 transitions. [2020-07-20 21:36:35,546 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 173 transitions. Word has length 191 [2020-07-20 21:36:35,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:35,546 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 173 transitions. [2020-07-20 21:36:35,546 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:36:35,546 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 173 transitions. [2020-07-20 21:36:35,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2020-07-20 21:36:35,549 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:35,549 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 12, 11, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:35,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:35,765 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:35,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:35,765 INFO L82 PathProgramCache]: Analyzing trace with hash -31808317, now seen corresponding path program 13 times [2020-07-20 21:36:35,765 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:35,765 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [893291653] [2020-07-20 21:36:35,766 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 21:36:35,947 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:35,947 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:35,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 21:36:35,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:36,055 INFO L134 CoverageAnalysis]: Checked inductivity of 1073 backedges. 270 proven. 100 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2020-07-20 21:36:36,056 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:36,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:36,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:37,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:37,197 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:37,346 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:37,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:37,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:37,432 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:37,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:37,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:37,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:37,681 INFO L134 CoverageAnalysis]: Checked inductivity of 1073 backedges. 270 proven. 116 refuted. 0 times theorem prover too weak. 687 trivial. 0 not checked. [2020-07-20 21:36:37,681 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [893291653] [2020-07-20 21:36:37,681 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:37,681 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-20 21:36:37,681 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511511292] [2020-07-20 21:36:37,682 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 21:36:37,682 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:37,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 21:36:37,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:37,683 INFO L87 Difference]: Start difference. First operand 101 states and 173 transitions. Second operand 17 states. [2020-07-20 21:36:37,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:37,986 INFO L93 Difference]: Finished difference Result 121 states and 205 transitions. [2020-07-20 21:36:37,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:36:37,986 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 204 [2020-07-20 21:36:37,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:37,989 INFO L225 Difference]: With dead ends: 121 [2020-07-20 21:36:37,989 INFO L226 Difference]: Without dead ends: 114 [2020-07-20 21:36:37,991 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 413 GetRequests, 379 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:36:37,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-07-20 21:36:37,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 93. [2020-07-20 21:36:37,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-07-20 21:36:37,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 161 transitions. [2020-07-20 21:36:38,000 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 161 transitions. Word has length 204 [2020-07-20 21:36:38,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:38,000 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 161 transitions. [2020-07-20 21:36:38,000 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 21:36:38,000 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 161 transitions. [2020-07-20 21:36:38,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2020-07-20 21:36:38,002 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:38,003 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 10, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:38,216 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:38,217 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:38,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:38,218 INFO L82 PathProgramCache]: Analyzing trace with hash 307857833, now seen corresponding path program 14 times [2020-07-20 21:36:38,218 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:38,218 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2063393406] [2020-07-20 21:36:38,218 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 21:36:38,419 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 21:36:38,419 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 21:36:38,420 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 21:36:38,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 21:36:38,457 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 21:36:38,492 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 21:36:38,492 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 21:36:38,706 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:38,758 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 09:36:38 BoogieIcfgContainer [2020-07-20 21:36:38,758 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 21:36:38,760 INFO L168 Benchmark]: Toolchain (without parser) took 38487.86 ms. Allocated memory was 135.3 MB in the beginning and 577.2 MB in the end (delta: 442.0 MB). Free memory was 98.5 MB in the beginning and 157.9 MB in the end (delta: -59.3 MB). Peak memory consumption was 382.6 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:38,760 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 135.3 MB. Free memory was 117.1 MB in the beginning and 116.9 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 21:36:38,761 INFO L168 Benchmark]: CACSL2BoogieTranslator took 247.56 ms. Allocated memory is still 135.3 MB. Free memory was 98.3 MB in the beginning and 88.7 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:38,761 INFO L168 Benchmark]: Boogie Preprocessor took 101.79 ms. Allocated memory was 135.3 MB in the beginning and 199.2 MB in the end (delta: 64.0 MB). Free memory was 88.7 MB in the beginning and 177.9 MB in the end (delta: -89.3 MB). Peak memory consumption was 14.4 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:38,762 INFO L168 Benchmark]: RCFGBuilder took 268.15 ms. Allocated memory is still 199.2 MB. Free memory was 177.9 MB in the beginning and 164.4 MB in the end (delta: 13.5 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:38,762 INFO L168 Benchmark]: TraceAbstraction took 37863.30 ms. Allocated memory was 199.2 MB in the beginning and 577.2 MB in the end (delta: 378.0 MB). Free memory was 163.8 MB in the beginning and 157.9 MB in the end (delta: 5.9 MB). Peak memory consumption was 383.9 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:38,764 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 135.3 MB. Free memory was 117.1 MB in the beginning and 116.9 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 247.56 ms. Allocated memory is still 135.3 MB. Free memory was 98.3 MB in the beginning and 88.7 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 101.79 ms. Allocated memory was 135.3 MB in the beginning and 199.2 MB in the end (delta: 64.0 MB). Free memory was 88.7 MB in the beginning and 177.9 MB in the end (delta: -89.3 MB). Peak memory consumption was 14.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 268.15 ms. Allocated memory is still 199.2 MB. Free memory was 177.9 MB in the beginning and 164.4 MB in the end (delta: 13.5 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 37863.30 ms. Allocated memory was 199.2 MB in the beginning and 577.2 MB in the end (delta: 378.0 MB). Free memory was 163.8 MB in the beginning and 157.9 MB in the end (delta: 5.9 MB). Peak memory consumption was 383.9 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 6; VAL [x=6] [L37] CALL, EXPR fibo1(x) VAL [\old(n)=6] [L8] COND FALSE !(n < 1) VAL [\old(n)=6, n=6] [L10] COND FALSE !(n == 1) VAL [\old(n)=6, n=6] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=5] [L18] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L20] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=4] [L8] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L10] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=4, fibo2(n-1)=2, n=4] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=4, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=5, fibo1(n-1)=3, n=5] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=5, fibo1(n-1)=3, fibo1(n-2)=2, n=5] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=6, fibo2(n-1)=5, n=6] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=4] [L18] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L20] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=4, fibo1(n-1)=2, n=4] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=4, fibo1(n-1)=2, fibo1(n-2)=1, n=4] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=6, fibo2(n-1)=5, fibo2(n-2)=3, n=6] [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) VAL [fibo1(x)=8, x=6] [L37] int result = fibo1(x); [L38] COND TRUE result == 8 VAL [result=8, x=6] [L39] __VERIFIER_error() VAL [result=8, x=6] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 37.7s, OverallIterations: 27, TraceHistogramMax: 18, AutomataDifference: 5.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 635 SDtfs, 1042 SDslu, 3546 SDs, 0 SdLazy, 3607 SolverSat, 848 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 6247 GetRequests, 5623 SyntacticMatches, 225 SemanticMatches, 399 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1101 ImplicationChecksByTransitivity, 4.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=101occurred in iteration=25, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.3s AutomataMinimizationTime, 26 MinimizatonAttempts, 424 StatesRemovedByMinimization, 23 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 0.8s SatisfiabilityAnalysisTime, 22.8s InterpolantComputationTime, 3264 NumberOfCodeBlocks, 2697 NumberOfCodeBlocksAsserted, 83 NumberOfCheckSat, 6097 ConstructedInterpolants, 0 QuantifiedInterpolants, 1531967 SizeOfPredicates, 132 NumberOfNonLiveVariables, 6115 ConjunctsInSsa, 264 ConjunctsInUnsatCore, 50 InterpolantComputations, 2 PerfectInterpolantSequences, 19515/23532 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...