/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_5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 21:35:53,716 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-20 21:35:53,744 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 21:35:53,747 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 21:35:53,749 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 21:35:53,762 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 21:35:53,768 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 21:35:53,770 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 21:35:53,773 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 21:35:53,775 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 21:35:53,775 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 21:35:53,777 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 21:35:53,780 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 21:35:53,781 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 21:35:53,783 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 21:35:53,784 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 21:35:53,786 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 21:35:53,792 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 21:35:53,798 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 21:35:53,803 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 21:35:53,804 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 21:35:53,805 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 21:35:53,809 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 21:35:53,826 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 21:35:53,869 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 21:35:53,870 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 21:35:53,874 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 21:35:53,875 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 21:35:53,875 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 21:35:53,876 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 21:35:53,876 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 21:35:53,876 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 21:35:53,876 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 21:35:53,877 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 21:35:53,877 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 21:35:53,881 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 21:35:53,882 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 21:35:53,882 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 21:35:53,882 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 21:35:53,882 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 21:35:53,883 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 21:35:53,883 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 21:35:53,884 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 21:35:53,884 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 21:35:53,885 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 21:35:53,885 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:35:53,885 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 21:35:53,886 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 21:35:53,886 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 21:35:53,886 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 21:35:53,886 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:53,886 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 21:35:53,887 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 21:35:53,887 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 21:35:54,241 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 21:35:54,257 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 21:35:54,261 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 21:35:54,263 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 21:35:54,264 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 21:35:54,265 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_5-1.c [2020-07-20 21:35:54,339 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d7facf7b2/bd8345572f994d94b8a86cd0f3cf8d70/FLAGd04292ecc [2020-07-20 21:35:54,888 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 21:35:54,889 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_5-1.c [2020-07-20 21:35:54,903 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d7facf7b2/bd8345572f994d94b8a86cd0f3cf8d70/FLAGd04292ecc [2020-07-20 21:35:55,178 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d7facf7b2/bd8345572f994d94b8a86cd0f3cf8d70 [2020-07-20 21:35:55,191 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 21:35:55,195 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 21:35:55,197 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 21:35:55,197 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 21:35:55,203 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 21:35:55,204 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:35:55" (1/1) ... [2020-07-20 21:35:55,209 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@79def3db and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:55, skipping insertion in model container [2020-07-20 21:35:55,209 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:35:55" (1/1) ... [2020-07-20 21:35:55,221 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 21:35:55,247 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 21:35:55,522 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:35:55,527 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 21:35:55,545 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:35:55,559 INFO L208 MainTranslator]: Completed translation [2020-07-20 21:35:55,560 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:55 WrapperNode [2020-07-20 21:35:55,560 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 21:35:55,561 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 21:35:55,561 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 21:35:55,561 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 21:35:55,575 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:55" (1/1) ... [2020-07-20 21:35:55,576 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:55" (1/1) ... [2020-07-20 21:35:55,582 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:55" (1/1) ... [2020-07-20 21:35:55,582 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:55" (1/1) ... [2020-07-20 21:35:55,590 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:55" (1/1) ... [2020-07-20 21:35:55,593 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:55" (1/1) ... [2020-07-20 21:35:55,594 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:55" (1/1) ... [2020-07-20 21:35:55,596 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 21:35:55,597 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 21:35:55,597 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 21:35:55,597 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 21:35:55,598 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:55" (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 21:35:55,786 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 21:35:55,786 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 21:35:55,786 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-20 21:35:55,786 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-20 21:35:55,787 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 21:35:55,788 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 21:35:55,788 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 21:35:55,788 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-20 21:35:55,788 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-20 21:35:55,789 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 21:35:55,789 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 21:35:55,789 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 21:35:56,095 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 21:35:56,096 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 21:35:56,102 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:35:56 BoogieIcfgContainer [2020-07-20 21:35:56,102 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 21:35:56,112 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 21:35:56,112 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 21:35:56,119 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 21:35:56,120 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 09:35:55" (1/3) ... [2020-07-20 21:35:56,121 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@663a120a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:35:56, skipping insertion in model container [2020-07-20 21:35:56,122 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:35:55" (2/3) ... [2020-07-20 21:35:56,122 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@663a120a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:35:56, skipping insertion in model container [2020-07-20 21:35:56,123 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:35:56" (3/3) ... [2020-07-20 21:35:56,126 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_5-1.c [2020-07-20 21:35:56,143 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 21:35:56,157 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 21:35:56,187 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 21:35:56,215 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 21:35:56,215 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 21:35:56,215 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 21:35:56,215 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 21:35:56,216 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 21:35:56,216 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 21:35:56,216 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 21:35:56,216 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 21:35:56,236 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 21:35:56,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 21:35:56,243 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:56,244 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:35:56,245 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:56,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:56,251 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-20 21:35:56,259 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:56,260 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [162825802] [2020-07-20 21:35:56,260 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 21:35:56,338 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:35:56,339 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:56,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:35:56,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:56,442 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 21:35:56,442 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:35:56,444 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [162825802] [2020-07-20 21:35:56,445 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:35:56,445 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:35:56,446 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1741802318] [2020-07-20 21:35:56,451 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:35:56,451 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:56,462 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:35:56,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:35:56,465 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-20 21:35:56,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:56,605 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-20 21:35:56,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:35:56,608 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 21:35:56,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:56,621 INFO L225 Difference]: With dead ends: 44 [2020-07-20 21:35:56,622 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 21:35:56,626 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 21:35:56,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 21:35:56,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 21:35:56,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 21:35:56,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 21:35:56,684 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-20 21:35:56,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:56,685 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 21:35:56,685 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:35:56,686 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 21:35:56,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 21:35:56,688 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:56,688 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:35:56,898 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:56,901 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:56,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:56,902 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-20 21:35:56,902 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:56,903 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2027575955] [2020-07-20 21:35:56,903 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 21:35:56,954 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:35:56,954 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:56,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:35:56,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:56,996 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 21:35:56,996 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:35:56,997 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2027575955] [2020-07-20 21:35:56,997 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:35:56,997 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:35:56,998 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047120017] [2020-07-20 21:35:57,000 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:35:57,000 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:57,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:35:57,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:35:57,002 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-20 21:35:57,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:57,093 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 21:35:57,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:35:57,094 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 21:35:57,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:57,096 INFO L225 Difference]: With dead ends: 36 [2020-07-20 21:35:57,096 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 21:35:57,098 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 21:35:57,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 21:35:57,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 21:35:57,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 21:35:57,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 21:35:57,110 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-20 21:35:57,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:57,111 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 21:35:57,111 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:35:57,111 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 21:35:57,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 21:35:57,113 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:57,113 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 21:35:57,329 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:57,330 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:57,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:57,331 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-20 21:35:57,332 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:57,332 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1045574311] [2020-07-20 21:35:57,333 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 21:35:57,367 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:35:57,368 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:57,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:35:57,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:57,464 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 21:35:57,465 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:35:57,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:57,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:57,819 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 21:35:57,825 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1045574311] [2020-07-20 21:35:57,825 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:35:57,825 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 21:35:57,826 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690957000] [2020-07-20 21:35:57,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 21:35:57,829 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:57,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 21:35:57,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 21:35:57,830 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-20 21:35:58,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:58,001 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-20 21:35:58,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 21:35:58,002 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 21:35:58,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:58,005 INFO L225 Difference]: With dead ends: 41 [2020-07-20 21:35:58,005 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 21:35:58,007 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 21:35:58,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 21:35:58,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-20 21:35:58,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 21:35:58,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 21:35:58,031 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-20 21:35:58,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:58,032 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 21:35:58,032 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 21:35:58,032 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 21:35:58,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 21:35:58,034 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:58,036 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 21:35:58,242 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:58,244 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:58,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:58,245 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-20 21:35:58,245 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:58,246 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1054044543] [2020-07-20 21:35:58,246 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 21:35:58,293 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:35:58,294 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:58,296 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:35:58,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:58,359 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 21:35:58,360 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:35:58,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:58,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:58,554 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 21:35:58,555 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1054044543] [2020-07-20 21:35:58,555 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:35:58,555 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 21:35:58,556 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241219648] [2020-07-20 21:35:58,557 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 21:35:58,557 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:58,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 21:35:58,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 21:35:58,558 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-20 21:35:58,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:58,705 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-20 21:35:58,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 21:35:58,706 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 21:35:58,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:58,709 INFO L225 Difference]: With dead ends: 46 [2020-07-20 21:35:58,709 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 21:35:58,710 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 21:35:58,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 21:35:58,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-20 21:35:58,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 21:35:58,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 21:35:58,722 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-20 21:35:58,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:58,723 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 21:35:58,723 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 21:35:58,723 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 21:35:58,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 21:35:58,725 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:58,726 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 21:35:58,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:58,942 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:58,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:58,943 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-20 21:35:58,943 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:58,944 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1653135889] [2020-07-20 21:35:58,944 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 21:35:58,987 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:35:58,987 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:58,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:35:58,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:59,061 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 21:35:59,061 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:35:59,306 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:59,390 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:59,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:59,445 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 21:35:59,446 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1653135889] [2020-07-20 21:35:59,446 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:35:59,446 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 21:35:59,447 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440953799] [2020-07-20 21:35:59,448 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 21:35:59,448 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:59,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 21:35:59,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 21:35:59,449 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-20 21:35:59,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:35:59,644 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-20 21:35:59,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:35:59,645 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-20 21:35:59,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:35:59,648 INFO L225 Difference]: With dead ends: 51 [2020-07-20 21:35:59,648 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 21:35:59,649 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 21:35:59,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 21:35:59,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-20 21:35:59,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 21:35:59,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 21:35:59,661 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-20 21:35:59,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:35:59,662 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 21:35:59,662 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 21:35:59,662 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 21:35:59,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 21:35:59,665 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:35:59,665 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 21:35:59,878 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:35:59,880 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:35:59,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:35:59,881 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-20 21:35:59,881 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:35:59,882 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1960676146] [2020-07-20 21:35:59,882 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 21:35:59,931 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:35:59,932 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:35:59,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:35:59,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:35:59,994 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 21:35:59,995 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:00,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:00,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:00,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:00,374 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 21:36:00,375 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1960676146] [2020-07-20 21:36:00,375 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:00,375 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 21:36:00,376 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1289222345] [2020-07-20 21:36:00,376 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 21:36:00,377 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:00,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 21:36:00,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 21:36:00,378 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-20 21:36:00,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:00,563 INFO L93 Difference]: Finished difference Result 56 states and 84 transitions. [2020-07-20 21:36:00,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:36:00,564 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-20 21:36:00,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:00,566 INFO L225 Difference]: With dead ends: 56 [2020-07-20 21:36:00,567 INFO L226 Difference]: Without dead ends: 52 [2020-07-20 21:36:00,568 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 21:36:00,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-20 21:36:00,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2020-07-20 21:36:00,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 21:36:00,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 21:36:00,580 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 40 [2020-07-20 21:36:00,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:00,581 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 21:36:00,581 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 21:36:00,581 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 21:36:00,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-20 21:36:00,586 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:00,587 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 21:36:00,801 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:00,802 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:00,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:00,802 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2020-07-20 21:36:00,803 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:00,803 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1807919167] [2020-07-20 21:36:00,804 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 21:36:00,862 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:00,863 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:00,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:00,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:00,927 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 21:36:00,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:01,313 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:01,314 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:01,408 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:01,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:01,522 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 21:36:01,522 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1807919167] [2020-07-20 21:36:01,522 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:01,523 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 21:36:01,523 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364280925] [2020-07-20 21:36:01,524 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 21:36:01,524 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:01,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 21:36:01,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:36:01,525 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 14 states. [2020-07-20 21:36:01,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:01,772 INFO L93 Difference]: Finished difference Result 61 states and 96 transitions. [2020-07-20 21:36:01,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:01,772 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 52 [2020-07-20 21:36:01,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:01,775 INFO L225 Difference]: With dead ends: 61 [2020-07-20 21:36:01,775 INFO L226 Difference]: Without dead ends: 57 [2020-07-20 21:36:01,776 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 21:36:01,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-20 21:36:01,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2020-07-20 21:36:01,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 21:36:01,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 21:36:01,790 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 52 [2020-07-20 21:36:01,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:01,790 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 21:36:01,791 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 21:36:01,791 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 21:36:01,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-20 21:36:01,794 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:01,794 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 21:36:02,012 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:02,013 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:02,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:02,014 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-20 21:36:02,014 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:02,014 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1052639048] [2020-07-20 21:36:02,014 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 21:36:02,077 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:02,078 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:02,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:02,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:02,156 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 21:36:02,157 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:02,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:02,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:02,604 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:02,605 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:02,653 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:02,701 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 21:36:02,701 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1052639048] [2020-07-20 21:36:02,702 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:02,702 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 21:36:02,703 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718941950] [2020-07-20 21:36:02,705 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:36:02,705 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:02,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:36:02,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:36:02,706 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 13 states. [2020-07-20 21:36:02,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:02,942 INFO L93 Difference]: Finished difference Result 66 states and 110 transitions. [2020-07-20 21:36:02,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:02,943 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 54 [2020-07-20 21:36:02,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:02,945 INFO L225 Difference]: With dead ends: 66 [2020-07-20 21:36:02,946 INFO L226 Difference]: Without dead ends: 62 [2020-07-20 21:36:02,947 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 90 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 21:36:02,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-20 21:36:02,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 45. [2020-07-20 21:36:02,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 21:36:02,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 21:36:02,960 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 54 [2020-07-20 21:36:02,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:02,961 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 21:36:02,961 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:36:02,961 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 21:36:02,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-20 21:36:02,963 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:02,963 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 21:36:03,177 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:03,178 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:03,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:03,179 INFO L82 PathProgramCache]: Analyzing trace with hash -975547772, now seen corresponding path program 3 times [2020-07-20 21:36:03,180 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:03,181 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2029577221] [2020-07-20 21:36:03,181 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 21:36:03,252 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:03,252 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:03,253 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:36:03,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:03,355 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 21:36:03,355 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:03,974 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:03,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:04,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:04,191 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:04,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:04,238 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:04,239 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:04,302 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 21:36:04,303 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2029577221] [2020-07-20 21:36:04,303 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:04,304 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 21:36:04,304 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1677945703] [2020-07-20 21:36:04,304 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:36:04,305 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:04,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:36:04,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:04,305 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 15 states. [2020-07-20 21:36:04,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:04,582 INFO L93 Difference]: Finished difference Result 71 states and 124 transitions. [2020-07-20 21:36:04,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:04,583 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 78 [2020-07-20 21:36:04,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:04,585 INFO L225 Difference]: With dead ends: 71 [2020-07-20 21:36:04,585 INFO L226 Difference]: Without dead ends: 67 [2020-07-20 21:36:04,587 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 134 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 21:36:04,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-20 21:36:04,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 50. [2020-07-20 21:36:04,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 21:36:04,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-20 21:36:04,601 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 78 [2020-07-20 21:36:04,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:04,601 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-20 21:36:04,602 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:36:04,602 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-20 21:36:04,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-20 21:36:04,604 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:04,604 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 21:36:04,818 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:04,820 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:04,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:04,821 INFO L82 PathProgramCache]: Analyzing trace with hash 1891337214, now seen corresponding path program 2 times [2020-07-20 21:36:04,822 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:04,822 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [924561541] [2020-07-20 21:36:04,823 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 21:36:04,890 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:04,891 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:04,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:04,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:04,976 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 27 proven. 79 refuted. 0 times theorem prover too weak. 161 trivial. 0 not checked. [2020-07-20 21:36:04,977 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:05,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:05,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:05,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:05,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:05,657 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 27 proven. 83 refuted. 0 times theorem prover too weak. 157 trivial. 0 not checked. [2020-07-20 21:36:05,657 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [924561541] [2020-07-20 21:36:05,658 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:05,658 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 21:36:05,658 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643167285] [2020-07-20 21:36:05,659 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:36:05,659 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:05,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:36:05,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:36:05,660 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 13 states. [2020-07-20 21:36:05,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:05,873 INFO L93 Difference]: Finished difference Result 84 states and 164 transitions. [2020-07-20 21:36:05,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:05,873 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 108 [2020-07-20 21:36:05,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:05,876 INFO L225 Difference]: With dead ends: 84 [2020-07-20 21:36:05,876 INFO L226 Difference]: Without dead ends: 80 [2020-07-20 21:36:05,879 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 196 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:05,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-07-20 21:36:05,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 52. [2020-07-20 21:36:05,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-07-20 21:36:05,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 80 transitions. [2020-07-20 21:36:05,915 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 80 transitions. Word has length 108 [2020-07-20 21:36:05,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:05,916 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 80 transitions. [2020-07-20 21:36:05,916 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:36:05,916 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 80 transitions. [2020-07-20 21:36:05,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-20 21:36:05,918 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:05,918 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 6, 6, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:06,132 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:06,133 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:06,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:06,134 INFO L82 PathProgramCache]: Analyzing trace with hash -60364660, now seen corresponding path program 1 times [2020-07-20 21:36:06,134 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:06,135 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1614345175] [2020-07-20 21:36:06,135 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 21:36:06,203 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:06,203 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:06,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:36:06,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:06,268 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 36 proven. 56 refuted. 0 times theorem prover too weak. 178 trivial. 0 not checked. [2020-07-20 21:36:06,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:06,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:06,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:06,659 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:06,718 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 36 proven. 58 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2020-07-20 21:36:06,718 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1614345175] [2020-07-20 21:36:06,719 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:06,719 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-20 21:36:06,719 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505869065] [2020-07-20 21:36:06,720 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 21:36:06,720 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:06,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 21:36:06,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:36:06,721 INFO L87 Difference]: Start difference. First operand 52 states and 80 transitions. Second operand 11 states. [2020-07-20 21:36:06,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:06,902 INFO L93 Difference]: Finished difference Result 79 states and 145 transitions. [2020-07-20 21:36:06,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:36:06,904 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 109 [2020-07-20 21:36:06,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:06,907 INFO L225 Difference]: With dead ends: 79 [2020-07-20 21:36:06,908 INFO L226 Difference]: Without dead ends: 75 [2020-07-20 21:36:06,909 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 202 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 21:36:06,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-07-20 21:36:06,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 54. [2020-07-20 21:36:06,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-20 21:36:06,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 85 transitions. [2020-07-20 21:36:06,922 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 85 transitions. Word has length 109 [2020-07-20 21:36:06,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:06,922 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 85 transitions. [2020-07-20 21:36:06,922 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 21:36:06,923 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 85 transitions. [2020-07-20 21:36:06,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-07-20 21:36:06,925 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:06,925 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 8, 8, 7, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:07,138 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:07,139 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:07,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:07,140 INFO L82 PathProgramCache]: Analyzing trace with hash 836558126, now seen corresponding path program 1 times [2020-07-20 21:36:07,140 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:07,140 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [240168483] [2020-07-20 21:36:07,141 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 21:36:07,221 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:07,221 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:07,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:36:07,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:07,301 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 81 proven. 103 refuted. 0 times theorem prover too weak. 254 trivial. 0 not checked. [2020-07-20 21:36:07,301 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:07,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [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 21:36:08,187 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:08,188 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:08,238 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:08,287 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:08,325 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 81 proven. 113 refuted. 0 times theorem prover too weak. 244 trivial. 0 not checked. [2020-07-20 21:36:08,326 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [240168483] [2020-07-20 21:36:08,326 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:08,326 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 21:36:08,327 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496683524] [2020-07-20 21:36:08,327 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:36:08,328 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:08,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:36:08,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:08,329 INFO L87 Difference]: Start difference. First operand 54 states and 85 transitions. Second operand 15 states. [2020-07-20 21:36:08,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:08,622 INFO L93 Difference]: Finished difference Result 94 states and 199 transitions. [2020-07-20 21:36:08,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:08,622 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 135 [2020-07-20 21:36:08,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:08,624 INFO L225 Difference]: With dead ends: 94 [2020-07-20 21:36:08,624 INFO L226 Difference]: Without dead ends: 62 [2020-07-20 21:36:08,627 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 245 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 21:36:08,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-20 21:36:08,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2020-07-20 21:36:08,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-07-20 21:36:08,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 95 transitions. [2020-07-20 21:36:08,637 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 95 transitions. Word has length 135 [2020-07-20 21:36:08,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:08,638 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 95 transitions. [2020-07-20 21:36:08,638 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:36:08,638 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 95 transitions. [2020-07-20 21:36:08,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 21:36:08,641 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:08,642 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:08,855 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:08,856 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:08,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:08,857 INFO L82 PathProgramCache]: Analyzing trace with hash -1608635723, now seen corresponding path program 2 times [2020-07-20 21:36:08,857 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:08,857 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1133798763] [2020-07-20 21:36:08,858 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 21:36:08,936 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:08,937 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:08,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:08,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:09,014 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 48 proven. 78 refuted. 0 times theorem prover too weak. 208 trivial. 0 not checked. [2020-07-20 21:36:09,014 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:09,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:09,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:09,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:09,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:09,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:09,699 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 48 proven. 82 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2020-07-20 21:36:09,700 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1133798763] [2020-07-20 21:36:09,700 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:09,700 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 21:36:09,701 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978171669] [2020-07-20 21:36:09,701 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:36:09,701 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:09,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:36:09,702 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:36:09,702 INFO L87 Difference]: Start difference. First operand 62 states and 95 transitions. Second operand 13 states. [2020-07-20 21:36:09,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:09,904 INFO L93 Difference]: Finished difference Result 92 states and 161 transitions. [2020-07-20 21:36:09,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:09,904 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 121 [2020-07-20 21:36:09,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:09,907 INFO L225 Difference]: With dead ends: 92 [2020-07-20 21:36:09,907 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 21:36:09,908 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 221 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 21:36:09,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 21:36:09,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 65. [2020-07-20 21:36:09,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-20 21:36:09,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 103 transitions. [2020-07-20 21:36:09,920 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 103 transitions. Word has length 121 [2020-07-20 21:36:09,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:09,921 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 103 transitions. [2020-07-20 21:36:09,921 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:36:09,921 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 103 transitions. [2020-07-20 21:36:09,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2020-07-20 21:36:09,923 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:09,924 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:10,129 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:10,132 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:10,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:10,133 INFO L82 PathProgramCache]: Analyzing trace with hash -46122593, now seen corresponding path program 3 times [2020-07-20 21:36:10,133 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:10,134 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [647032912] [2020-07-20 21:36:10,134 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 21:36:10,215 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:10,216 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:10,218 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:36:10,221 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:10,278 INFO L134 CoverageAnalysis]: Checked inductivity of 188 backedges. 58 proven. 15 refuted. 0 times theorem prover too weak. 115 trivial. 0 not checked. [2020-07-20 21:36:10,279 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:10,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:10,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:10,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:10,656 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:10,719 INFO L134 CoverageAnalysis]: Checked inductivity of 188 backedges. 58 proven. 17 refuted. 0 times theorem prover too weak. 113 trivial. 0 not checked. [2020-07-20 21:36:10,720 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [647032912] [2020-07-20 21:36:10,721 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:10,721 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-20 21:36:10,721 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1554920671] [2020-07-20 21:36:10,722 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 21:36:10,722 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:10,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 21:36:10,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:36:10,723 INFO L87 Difference]: Start difference. First operand 65 states and 103 transitions. Second operand 11 states. [2020-07-20 21:36:10,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:10,872 INFO L93 Difference]: Finished difference Result 84 states and 140 transitions. [2020-07-20 21:36:10,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:36:10,873 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 95 [2020-07-20 21:36:10,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:10,875 INFO L225 Difference]: With dead ends: 84 [2020-07-20 21:36:10,876 INFO L226 Difference]: Without dead ends: 80 [2020-07-20 21:36:10,877 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 173 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 21:36:10,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-07-20 21:36:10,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 72. [2020-07-20 21:36:10,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-20 21:36:10,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 122 transitions. [2020-07-20 21:36:10,887 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 122 transitions. Word has length 95 [2020-07-20 21:36:10,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:10,887 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 122 transitions. [2020-07-20 21:36:10,887 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 21:36:10,888 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 122 transitions. [2020-07-20 21:36:10,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2020-07-20 21:36:10,890 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:10,890 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:11,102 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:11,102 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:11,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:11,103 INFO L82 PathProgramCache]: Analyzing trace with hash 594466134, now seen corresponding path program 4 times [2020-07-20 21:36:11,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:11,104 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1901288487] [2020-07-20 21:36:11,105 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 21:36:11,187 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:11,187 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:11,189 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:11,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:11,258 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 83 proven. 24 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-07-20 21:36:11,259 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:11,644 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:11,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:11,759 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:11,819 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:11,898 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:11,970 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 85 proven. 26 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2020-07-20 21:36:11,971 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1901288487] [2020-07-20 21:36:11,971 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:11,971 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 21:36:11,971 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1675637540] [2020-07-20 21:36:11,972 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:36:11,972 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:11,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:36:11,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:36:11,973 INFO L87 Difference]: Start difference. First operand 72 states and 122 transitions. Second operand 13 states. [2020-07-20 21:36:12,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:12,182 INFO L93 Difference]: Finished difference Result 92 states and 158 transitions. [2020-07-20 21:36:12,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:12,183 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 107 [2020-07-20 21:36:12,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:12,187 INFO L225 Difference]: With dead ends: 92 [2020-07-20 21:36:12,187 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 21:36:12,189 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 193 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:12,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 21:36:12,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 73. [2020-07-20 21:36:12,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-07-20 21:36:12,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 119 transitions. [2020-07-20 21:36:12,210 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 119 transitions. Word has length 107 [2020-07-20 21:36:12,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:12,211 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 119 transitions. [2020-07-20 21:36:12,211 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:36:12,212 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 119 transitions. [2020-07-20 21:36:12,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-20 21:36:12,214 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:12,215 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:12,428 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:12,429 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:12,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:12,430 INFO L82 PathProgramCache]: Analyzing trace with hash 235412830, now seen corresponding path program 5 times [2020-07-20 21:36:12,431 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:12,431 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [661074545] [2020-07-20 21:36:12,431 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 21:36:12,547 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 21:36:12,548 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:12,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:36:12,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:12,610 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 63 proven. 19 refuted. 0 times theorem prover too weak. 175 trivial. 0 not checked. [2020-07-20 21:36:12,611 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:12,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:12,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:12,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:12,973 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:13,034 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 63 proven. 20 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2020-07-20 21:36:13,035 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [661074545] [2020-07-20 21:36:13,035 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:13,036 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-20 21:36:13,036 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [577593589] [2020-07-20 21:36:13,037 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 21:36:13,037 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:13,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 21:36:13,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:36:13,038 INFO L87 Difference]: Start difference. First operand 73 states and 119 transitions. Second operand 11 states. [2020-07-20 21:36:13,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:13,185 INFO L93 Difference]: Finished difference Result 91 states and 155 transitions. [2020-07-20 21:36:13,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:36:13,187 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 108 [2020-07-20 21:36:13,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:13,189 INFO L225 Difference]: With dead ends: 91 [2020-07-20 21:36:13,189 INFO L226 Difference]: Without dead ends: 87 [2020-07-20 21:36:13,190 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 199 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 21:36:13,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-07-20 21:36:13,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 73. [2020-07-20 21:36:13,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-07-20 21:36:13,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 119 transitions. [2020-07-20 21:36:13,199 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 119 transitions. Word has length 108 [2020-07-20 21:36:13,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:13,199 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 119 transitions. [2020-07-20 21:36:13,199 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 21:36:13,200 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 119 transitions. [2020-07-20 21:36:13,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-20 21:36:13,202 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:13,202 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:13,415 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:13,416 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:13,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:13,417 INFO L82 PathProgramCache]: Analyzing trace with hash -1540036056, now seen corresponding path program 6 times [2020-07-20 21:36:13,417 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:13,418 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1267041652] [2020-07-20 21:36:13,418 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 21:36:13,511 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 21:36:13,511 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:13,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 63 conjunts are in the unsatisfiable core [2020-07-20 21:36:13,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:13,852 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 172 trivial. 0 not checked. [2020-07-20 21:36:13,853 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:14,915 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 172 trivial. 0 not checked. [2020-07-20 21:36:14,920 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1267041652] [2020-07-20 21:36:14,924 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:14,924 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 28 [2020-07-20 21:36:14,925 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1976811984] [2020-07-20 21:36:14,926 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-20 21:36:14,926 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:14,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-20 21:36:14,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=691, Unknown=0, NotChecked=0, Total=756 [2020-07-20 21:36:14,927 INFO L87 Difference]: Start difference. First operand 73 states and 119 transitions. Second operand 28 states. [2020-07-20 21:36:15,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:15,395 INFO L93 Difference]: Finished difference Result 148 states and 317 transitions. [2020-07-20 21:36:15,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-20 21:36:15,396 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 109 [2020-07-20 21:36:15,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:15,399 INFO L225 Difference]: With dead ends: 148 [2020-07-20 21:36:15,399 INFO L226 Difference]: Without dead ends: 144 [2020-07-20 21:36:15,401 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 191 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=73, Invalid=797, Unknown=0, NotChecked=0, Total=870 [2020-07-20 21:36:15,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2020-07-20 21:36:15,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 107. [2020-07-20 21:36:15,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-07-20 21:36:15,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 226 transitions. [2020-07-20 21:36:15,419 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 226 transitions. Word has length 109 [2020-07-20 21:36:15,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:15,420 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 226 transitions. [2020-07-20 21:36:15,420 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-20 21:36:15,420 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 226 transitions. [2020-07-20 21:36:15,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2020-07-20 21:36:15,424 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:15,424 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 7, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:15,638 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:15,639 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:15,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:15,640 INFO L82 PathProgramCache]: Analyzing trace with hash -706406608, now seen corresponding path program 7 times [2020-07-20 21:36:15,640 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:15,641 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [975377131] [2020-07-20 21:36:15,641 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 21:36:15,768 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:15,769 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:15,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:15,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:15,863 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 60 proven. 97 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2020-07-20 21:36:15,863 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:16,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:16,489 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:16,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:16,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:16,571 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:16,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:16,641 INFO L134 CoverageAnalysis]: Checked inductivity of 445 backedges. 62 proven. 100 refuted. 0 times theorem prover too weak. 283 trivial. 0 not checked. [2020-07-20 21:36:16,642 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [975377131] [2020-07-20 21:36:16,643 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:16,643 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 21:36:16,643 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060066773] [2020-07-20 21:36:16,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:36:16,644 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:16,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:36:16,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:36:16,645 INFO L87 Difference]: Start difference. First operand 107 states and 226 transitions. Second operand 13 states. [2020-07-20 21:36:16,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:16,892 INFO L93 Difference]: Finished difference Result 156 states and 384 transitions. [2020-07-20 21:36:16,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:16,893 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 137 [2020-07-20 21:36:16,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:16,896 INFO L225 Difference]: With dead ends: 156 [2020-07-20 21:36:16,897 INFO L226 Difference]: Without dead ends: 116 [2020-07-20 21:36:16,899 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 253 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:16,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-07-20 21:36:16,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 107. [2020-07-20 21:36:16,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-07-20 21:36:16,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 226 transitions. [2020-07-20 21:36:16,914 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 226 transitions. Word has length 137 [2020-07-20 21:36:16,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:16,915 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 226 transitions. [2020-07-20 21:36:16,915 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:36:16,915 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 226 transitions. [2020-07-20 21:36:16,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-07-20 21:36:16,919 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:16,919 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 6, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:17,130 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:17,131 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:17,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:17,132 INFO L82 PathProgramCache]: Analyzing trace with hash -1521075862, now seen corresponding path program 8 times [2020-07-20 21:36:17,132 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:17,132 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [891104257] [2020-07-20 21:36:17,133 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 21:36:17,268 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:17,269 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:17,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:36:17,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:17,377 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 96 proven. 17 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2020-07-20 21:36:17,378 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:17,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:17,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:17,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:17,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:17,947 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:17,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:18,013 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:18,075 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 96 proven. 24 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2020-07-20 21:36:18,076 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [891104257] [2020-07-20 21:36:18,076 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:18,076 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-20 21:36:18,076 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [526665362] [2020-07-20 21:36:18,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:36:18,077 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:18,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:36:18,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:36:18,078 INFO L87 Difference]: Start difference. First operand 107 states and 226 transitions. Second operand 13 states. [2020-07-20 21:36:18,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:18,315 INFO L93 Difference]: Finished difference Result 138 states and 295 transitions. [2020-07-20 21:36:18,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:18,316 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 110 [2020-07-20 21:36:18,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:18,320 INFO L225 Difference]: With dead ends: 138 [2020-07-20 21:36:18,320 INFO L226 Difference]: Without dead ends: 134 [2020-07-20 21:36:18,322 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 199 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:18,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2020-07-20 21:36:18,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 114. [2020-07-20 21:36:18,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2020-07-20 21:36:18,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 257 transitions. [2020-07-20 21:36:18,338 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 257 transitions. Word has length 110 [2020-07-20 21:36:18,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:18,339 INFO L479 AbstractCegarLoop]: Abstraction has 114 states and 257 transitions. [2020-07-20 21:36:18,339 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:36:18,339 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 257 transitions. [2020-07-20 21:36:18,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 21:36:18,344 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:18,344 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:18,558 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:18,559 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:18,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:18,560 INFO L82 PathProgramCache]: Analyzing trace with hash 989968015, now seen corresponding path program 9 times [2020-07-20 21:36:18,561 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:18,561 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1416773905] [2020-07-20 21:36:18,561 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 21:36:18,669 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:18,670 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:18,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 21:36:18,673 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:18,767 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 112 proven. 26 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2020-07-20 21:36:18,768 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:19,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:19,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:19,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:19,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:19,567 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:19,660 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 111 proven. 31 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2020-07-20 21:36:19,660 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1416773905] [2020-07-20 21:36:19,660 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:19,661 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 15 [2020-07-20 21:36:19,661 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648231263] [2020-07-20 21:36:19,663 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:36:19,663 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:19,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:36:19,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:19,664 INFO L87 Difference]: Start difference. First operand 114 states and 257 transitions. Second operand 15 states. [2020-07-20 21:36:19,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:19,976 INFO L93 Difference]: Finished difference Result 147 states and 340 transitions. [2020-07-20 21:36:19,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:19,977 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 121 [2020-07-20 21:36:19,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:19,983 INFO L225 Difference]: With dead ends: 147 [2020-07-20 21:36:19,984 INFO L226 Difference]: Without dead ends: 143 [2020-07-20 21:36:19,986 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 219 SyntacticMatches, 9 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=78, Invalid=264, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:36:19,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2020-07-20 21:36:20,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 102. [2020-07-20 21:36:20,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-07-20 21:36:20,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 216 transitions. [2020-07-20 21:36:20,006 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 216 transitions. Word has length 121 [2020-07-20 21:36:20,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:20,007 INFO L479 AbstractCegarLoop]: Abstraction has 102 states and 216 transitions. [2020-07-20 21:36:20,007 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:36:20,007 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 216 transitions. [2020-07-20 21:36:20,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 21:36:20,011 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:20,012 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:20,227 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:20,227 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:20,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:20,228 INFO L82 PathProgramCache]: Analyzing trace with hash -77183713, now seen corresponding path program 10 times [2020-07-20 21:36:20,229 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:20,229 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2075440247] [2020-07-20 21:36:20,230 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 21:36:20,341 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:20,341 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:20,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 21:36:20,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:20,409 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 87 proven. 22 refuted. 0 times theorem prover too weak. 237 trivial. 0 not checked. [2020-07-20 21:36:20,409 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:20,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:20,801 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:20,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:20,911 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:20,972 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 86 proven. 24 refuted. 0 times theorem prover too weak. 236 trivial. 0 not checked. [2020-07-20 21:36:20,973 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2075440247] [2020-07-20 21:36:20,973 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:20,973 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10] total 13 [2020-07-20 21:36:20,973 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [364342071] [2020-07-20 21:36:20,974 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:36:20,974 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:20,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:36:20,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:36:20,975 INFO L87 Difference]: Start difference. First operand 102 states and 216 transitions. Second operand 13 states. [2020-07-20 21:36:21,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:21,200 INFO L93 Difference]: Finished difference Result 128 states and 276 transitions. [2020-07-20 21:36:21,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:36:21,201 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 121 [2020-07-20 21:36:21,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:21,207 INFO L225 Difference]: With dead ends: 128 [2020-07-20 21:36:21,207 INFO L226 Difference]: Without dead ends: 124 [2020-07-20 21:36:21,209 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 223 SyntacticMatches, 7 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2020-07-20 21:36:21,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-20 21:36:21,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 94. [2020-07-20 21:36:21,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-07-20 21:36:21,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 184 transitions. [2020-07-20 21:36:21,226 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 184 transitions. Word has length 121 [2020-07-20 21:36:21,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:21,228 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 184 transitions. [2020-07-20 21:36:21,228 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:36:21,228 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 184 transitions. [2020-07-20 21:36:21,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 21:36:21,231 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:21,231 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:21,445 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:21,446 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:21,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:21,446 INFO L82 PathProgramCache]: Analyzing trace with hash -1853548191, now seen corresponding path program 11 times [2020-07-20 21:36:21,447 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:21,447 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [761325457] [2020-07-20 21:36:21,447 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 21:36:21,562 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:21,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:21,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 21:36:21,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:21,647 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 67 proven. 71 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2020-07-20 21:36:21,647 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:22,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:22,258 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:22,259 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:22,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:22,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:22,440 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 66 proven. 76 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2020-07-20 21:36:22,441 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [761325457] [2020-07-20 21:36:22,441 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:22,441 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 15 [2020-07-20 21:36:22,441 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729441158] [2020-07-20 21:36:22,442 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:36:22,442 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:22,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:36:22,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:22,443 INFO L87 Difference]: Start difference. First operand 94 states and 184 transitions. Second operand 15 states. [2020-07-20 21:36:22,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:22,718 INFO L93 Difference]: Finished difference Result 126 states and 280 transitions. [2020-07-20 21:36:22,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:22,722 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 121 [2020-07-20 21:36:22,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:22,725 INFO L225 Difference]: With dead ends: 126 [2020-07-20 21:36:22,725 INFO L226 Difference]: Without dead ends: 94 [2020-07-20 21:36:22,727 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 219 SyntacticMatches, 9 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=78, Invalid=264, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:36:22,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-07-20 21:36:22,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 81. [2020-07-20 21:36:22,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-20 21:36:22,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 147 transitions. [2020-07-20 21:36:22,743 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 147 transitions. Word has length 121 [2020-07-20 21:36:22,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:22,743 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 147 transitions. [2020-07-20 21:36:22,743 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:36:22,743 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 147 transitions. [2020-07-20 21:36:22,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-07-20 21:36:22,746 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:22,746 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:22,960 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:22,961 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:22,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:22,962 INFO L82 PathProgramCache]: Analyzing trace with hash 250703466, now seen corresponding path program 1 times [2020-07-20 21:36:22,962 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:22,963 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [503731506] [2020-07-20 21:36:22,963 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 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 21:36:23,110 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:23,111 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:23,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:36:23,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:23,194 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 36 proven. 94 refuted. 0 times theorem prover too weak. 138 trivial. 0 not checked. [2020-07-20 21:36:23,194 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:23,828 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:23,829 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:24,028 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:24,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:24,157 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:24,216 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:24,217 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:24,252 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:24,287 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 38 proven. 102 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2020-07-20 21:36:24,288 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [503731506] [2020-07-20 21:36:24,288 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:24,289 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-20 21:36:24,289 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019516502] [2020-07-20 21:36:24,289 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:36:24,290 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:24,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:36:24,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:24,290 INFO L87 Difference]: Start difference. First operand 81 states and 147 transitions. Second operand 15 states. [2020-07-20 21:36:24,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:24,575 INFO L93 Difference]: Finished difference Result 124 states and 266 transitions. [2020-07-20 21:36:24,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:24,576 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 110 [2020-07-20 21:36:24,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:24,578 INFO L225 Difference]: With dead ends: 124 [2020-07-20 21:36:24,578 INFO L226 Difference]: Without dead ends: 81 [2020-07-20 21:36:24,581 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 195 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 21:36:24,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-20 21:36:24,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 76. [2020-07-20 21:36:24,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 21:36:24,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 106 transitions. [2020-07-20 21:36:24,590 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 106 transitions. Word has length 110 [2020-07-20 21:36:24,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:24,590 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 106 transitions. [2020-07-20 21:36:24,590 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:36:24,590 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 106 transitions. [2020-07-20 21:36:24,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 21:36:24,593 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:24,593 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:24,806 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:24,807 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:24,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:24,808 INFO L82 PathProgramCache]: Analyzing trace with hash -1905629551, now seen corresponding path program 12 times [2020-07-20 21:36:24,808 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:24,809 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1962403115] [2020-07-20 21:36:24,809 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 21:36:24,938 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:24,938 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:24,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 21:36:24,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:25,059 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 50 proven. 107 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2020-07-20 21:36:25,060 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:25,864 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:25,866 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:26,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:26,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:26,185 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 21:36:26,335 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 48 proven. 117 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2020-07-20 21:36:26,336 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1962403115] [2020-07-20 21:36:26,336 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:26,336 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 17 [2020-07-20 21:36:26,337 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [26611687] [2020-07-20 21:36:26,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 21:36:26,338 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:26,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 21:36:26,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:36:26,339 INFO L87 Difference]: Start difference. First operand 76 states and 106 transitions. Second operand 17 states. [2020-07-20 21:36:26,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:26,750 INFO L93 Difference]: Finished difference Result 129 states and 200 transitions. [2020-07-20 21:36:26,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:36:26,751 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 121 [2020-07-20 21:36:26,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:26,753 INFO L225 Difference]: With dead ends: 129 [2020-07-20 21:36:26,753 INFO L226 Difference]: Without dead ends: 61 [2020-07-20 21:36:26,756 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 215 SyntacticMatches, 11 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=105, Invalid=357, Unknown=0, NotChecked=0, Total=462 [2020-07-20 21:36:26,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-20 21:36:26,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-07-20 21:36:26,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 21:36:26,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 68 transitions. [2020-07-20 21:36:26,763 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 68 transitions. Word has length 121 [2020-07-20 21:36:26,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:26,763 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 68 transitions. [2020-07-20 21:36:26,764 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 21:36:26,764 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 68 transitions. [2020-07-20 21:36:26,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 21:36:26,765 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:36:26,766 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:36:26,978 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:26,979 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:36:26,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:36:26,979 INFO L82 PathProgramCache]: Analyzing trace with hash 1847656481, now seen corresponding path program 13 times [2020-07-20 21:36:26,980 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:36:26,980 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1611574940] [2020-07-20 21:36:26,980 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 21:36:27,107 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:36:27,108 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:36:27,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 21:36:27,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:36:27,212 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 52 proven. 86 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2020-07-20 21:36:27,213 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:36:27,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:27,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:27,969 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:28,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:28,062 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:28,150 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:36:28,195 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 53 proven. 89 refuted. 0 times theorem prover too weak. 192 trivial. 0 not checked. [2020-07-20 21:36:28,196 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1611574940] [2020-07-20 21:36:28,196 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:36:28,196 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 15 [2020-07-20 21:36:28,197 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599173548] [2020-07-20 21:36:28,197 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:36:28,198 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:36:28,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:36:28,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:36:28,206 INFO L87 Difference]: Start difference. First operand 61 states and 68 transitions. Second operand 15 states. [2020-07-20 21:36:28,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:36:28,438 INFO L93 Difference]: Finished difference Result 61 states and 68 transitions. [2020-07-20 21:36:28,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:36:28,439 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 121 [2020-07-20 21:36:28,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:36:28,440 INFO L225 Difference]: With dead ends: 61 [2020-07-20 21:36:28,440 INFO L226 Difference]: Without dead ends: 0 [2020-07-20 21:36:28,441 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 219 SyntacticMatches, 9 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=78, Invalid=264, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:36:28,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-20 21:36:28,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-20 21:36:28,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-20 21:36:28,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-20 21:36:28,444 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 121 [2020-07-20 21:36:28,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:36:28,444 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-20 21:36:28,444 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:36:28,445 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-20 21:36:28,445 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-20 21:36:28,653 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:36:28,658 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-20 21:36:29,001 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 32 [2020-07-20 21:36:31,043 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 43 [2020-07-20 21:36:31,636 WARN L193 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 21 [2020-07-20 21:36:32,001 WARN L193 SmtUtils]: Spent 339.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 24 [2020-07-20 21:36:32,007 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-20 21:36:32,008 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-20 21:36:32,008 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-20 21:36:32,008 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-20 21:36:32,008 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-20 21:36:32,009 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-20 21:36:32,009 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 39) no Hoare annotation was computed. [2020-07-20 21:36:32,009 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 35 42) the Hoare annotation is: true [2020-07-20 21:36:32,009 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 35 42) no Hoare annotation was computed. [2020-07-20 21:36:32,009 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 35 42) no Hoare annotation was computed. [2020-07-20 21:36:32,010 INFO L268 CegarLoopResult]: For program point L39(line 39) no Hoare annotation was computed. [2020-07-20 21:36:32,010 INFO L268 CegarLoopResult]: For program point L38(lines 38 40) no Hoare annotation was computed. [2020-07-20 21:36:32,010 INFO L264 CegarLoopResult]: At program point L37(line 37) the Hoare annotation is: (and (<= main_~x~0 5) (<= 5 main_~x~0)) [2020-07-20 21:36:32,010 INFO L268 CegarLoopResult]: For program point L37-1(line 37) no Hoare annotation was computed. [2020-07-20 21:36:32,010 INFO L268 CegarLoopResult]: For program point L38-2(lines 38 40) no Hoare annotation was computed. [2020-07-20 21:36:32,010 INFO L271 CegarLoopResult]: At program point fibo2ENTRY(lines 17 25) the Hoare annotation is: true [2020-07-20 21:36:32,011 INFO L264 CegarLoopResult]: At program point L23(line 23) the Hoare annotation is: (and (<= fibo2_~n |fibo2_#in~n|) (<= |fibo2_#in~n| fibo2_~n) (<= 2 |fibo2_#in~n|)) [2020-07-20 21:36:32,011 INFO L268 CegarLoopResult]: For program point L23-1(line 23) no Hoare annotation was computed. [2020-07-20 21:36:32,012 INFO L264 CegarLoopResult]: At program point L23-2(line 23) the Hoare annotation is: (and (<= fibo2_~n |fibo2_#in~n|) (or (<= 5 |fibo2_#in~n|) (and (<= 4 |fibo2_#in~n|) (= 2 |fibo2_#t~ret2|)) (and (= 1 |fibo2_#t~ret2|) (<= |fibo2_#in~n| 3))) (<= |fibo2_#in~n| fibo2_~n) (<= 2 |fibo2_#in~n|)) [2020-07-20 21:36:32,012 INFO L268 CegarLoopResult]: For program point L20(lines 20 24) no Hoare annotation was computed. [2020-07-20 21:36:32,012 INFO L268 CegarLoopResult]: For program point L23-3(line 23) no Hoare annotation was computed. [2020-07-20 21:36:32,012 INFO L268 CegarLoopResult]: For program point L18(lines 18 24) no Hoare annotation was computed. [2020-07-20 21:36:32,012 INFO L268 CegarLoopResult]: For program point fibo2FINAL(lines 17 25) no Hoare annotation was computed. [2020-07-20 21:36:32,012 INFO L268 CegarLoopResult]: For program point fibo2EXIT(lines 17 25) no Hoare annotation was computed. [2020-07-20 21:36:32,013 INFO L271 CegarLoopResult]: At program point fibo1ENTRY(lines 7 15) the Hoare annotation is: true [2020-07-20 21:36:32,013 INFO L264 CegarLoopResult]: At program point L13(line 13) the Hoare annotation is: (and (<= 2 |fibo1_#in~n|) (<= fibo1_~n |fibo1_#in~n|) (<= |fibo1_#in~n| fibo1_~n)) [2020-07-20 21:36:32,013 INFO L268 CegarLoopResult]: For program point L13-1(line 13) no Hoare annotation was computed. [2020-07-20 21:36:32,013 INFO L264 CegarLoopResult]: At program point L13-2(line 13) the Hoare annotation is: (and (let ((.cse0 (<= fibo1_~n |fibo1_#in~n|))) (or (and .cse0 (<= 4 |fibo1_#in~n|)) (and (<= 2 |fibo1_#in~n|) .cse0 (= 1 |fibo1_#t~ret0|)))) (let ((.cse1 (<= |fibo1_#in~n| fibo1_~n))) (or (and (<= 6 |fibo1_#in~n|) .cse1) (and (= 3 |fibo1_#t~ret0|) .cse1) (and (<= |fibo1_#in~n| 4) .cse1)))) [2020-07-20 21:36:32,013 INFO L268 CegarLoopResult]: For program point fibo1FINAL(lines 7 15) no Hoare annotation was computed. [2020-07-20 21:36:32,013 INFO L268 CegarLoopResult]: For program point L10(lines 10 14) no Hoare annotation was computed. [2020-07-20 21:36:32,013 INFO L268 CegarLoopResult]: For program point L13-3(line 13) no Hoare annotation was computed. [2020-07-20 21:36:32,014 INFO L268 CegarLoopResult]: For program point L8(lines 8 14) no Hoare annotation was computed. [2020-07-20 21:36:32,014 INFO L268 CegarLoopResult]: For program point fibo1EXIT(lines 7 15) no Hoare annotation was computed. [2020-07-20 21:36:32,024 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 09:36:32 BoogieIcfgContainer [2020-07-20 21:36:32,024 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 21:36:32,026 INFO L168 Benchmark]: Toolchain (without parser) took 36833.34 ms. Allocated memory was 145.8 MB in the beginning and 485.0 MB in the end (delta: 339.2 MB). Free memory was 103.7 MB in the beginning and 147.2 MB in the end (delta: -43.5 MB). Peak memory consumption was 336.8 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:32,027 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 145.8 MB. Free memory was 121.9 MB in the beginning and 121.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-20 21:36:32,027 INFO L168 Benchmark]: CACSL2BoogieTranslator took 363.50 ms. Allocated memory is still 145.8 MB. Free memory was 103.2 MB in the beginning and 93.3 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:32,028 INFO L168 Benchmark]: Boogie Preprocessor took 35.43 ms. Allocated memory is still 145.8 MB. Free memory was 93.3 MB in the beginning and 92.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:32,029 INFO L168 Benchmark]: RCFGBuilder took 505.81 ms. Allocated memory was 145.8 MB in the beginning and 203.4 MB in the end (delta: 57.7 MB). Free memory was 92.0 MB in the beginning and 169.8 MB in the end (delta: -77.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:32,030 INFO L168 Benchmark]: TraceAbstraction took 35912.49 ms. Allocated memory was 203.4 MB in the beginning and 485.0 MB in the end (delta: 281.5 MB). Free memory was 169.2 MB in the beginning and 147.2 MB in the end (delta: 22.0 MB). Peak memory consumption was 344.6 MB. Max. memory is 7.1 GB. [2020-07-20 21:36:32,032 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 145.8 MB. Free memory was 121.9 MB in the beginning and 121.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 363.50 ms. Allocated memory is still 145.8 MB. Free memory was 103.2 MB in the beginning and 93.3 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.0 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 35.43 ms. Allocated memory is still 145.8 MB. Free memory was 93.3 MB in the beginning and 92.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 505.81 ms. Allocated memory was 145.8 MB in the beginning and 203.4 MB in the end (delta: 57.7 MB). Free memory was 92.0 MB in the beginning and 169.8 MB in the end (delta: -77.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 35912.49 ms. Allocated memory was 203.4 MB in the beginning and 485.0 MB in the end (delta: 281.5 MB). Free memory was 169.2 MB in the beginning and 147.2 MB in the end (delta: 22.0 MB). Peak memory consumption was 344.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 39]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 32.4s, OverallIterations: 25, TraceHistogramMax: 11, AutomataDifference: 5.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 3.3s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 707 SDtfs, 785 SDslu, 4765 SDs, 0 SdLazy, 3930 SolverSat, 554 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 3.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 4445 GetRequests, 3901 SyntacticMatches, 181 SemanticMatches, 363 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 903 ImplicationChecksByTransitivity, 5.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=114occurred in iteration=19, 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, 25 MinimizatonAttempts, 340 StatesRemovedByMinimization, 21 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 11 LocationsWithAnnotation, 134 PreInvPairs, 1204 NumberOfFragments, 102 HoareAnnotationTreeSize, 134 FomulaSimplifications, 3894644 FormulaSimplificationTreeSizeReduction, 2.7s HoareSimplificationTime, 11 FomulaSimplificationsInter, 2083 FormulaSimplificationTreeSizeReductionInter, 0.6s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 0.7s SatisfiabilityAnalysisTime, 18.2s InterpolantComputationTime, 2197 NumberOfCodeBlocks, 1720 NumberOfCodeBlocksAsserted, 74 NumberOfCheckSat, 4319 ConstructedInterpolants, 0 QuantifiedInterpolants, 829261 SizeOfPredicates, 108 NumberOfNonLiveVariables, 4250 ConjunctsInSsa, 284 ConjunctsInUnsatCore, 48 InterpolantComputations, 2 PerfectInterpolantSequences, 8082/10394 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 correct! Received shutdown request...