/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 BIGGEST_EQUIVALENCE_CLASS --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_5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 22:20:16,167 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 22:20:16,170 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 22:20:16,187 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 22:20:16,188 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 22:20:16,190 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 22:20:16,192 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 22:20:16,204 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 22:20:16,206 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 22:20:16,207 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 22:20:16,208 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 22:20:16,210 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 22:20:16,210 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 22:20:16,213 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 22:20:16,216 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 22:20:16,217 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 22:20:16,219 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 22:20:16,221 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 22:20:16,222 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 22:20:16,229 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 22:20:16,233 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 22:20:16,234 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 22:20:16,236 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 22:20:16,237 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 22:20:16,240 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 22:20:16,251 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 22:20:16,252 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 22:20:16,253 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 22:20:16,254 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 [2020-07-21 22:20:16,273 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 22:20:16,273 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 22:20:16,275 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 22:20:16,275 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 22:20:16,276 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 22:20:16,276 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 22:20:16,276 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 22:20:16,277 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 22:20:16,277 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 22:20:16,277 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 22:20:16,278 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 22:20:16,278 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 22:20:16,278 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 22:20:16,279 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 22:20:16,279 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 22:20:16,279 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 22:20:16,279 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 22:20:16,280 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 22:20:16,280 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 22:20:16,280 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 22:20:16,280 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 22:20:16,280 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:20:16,281 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 22:20:16,281 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 22:20:16,281 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 22:20:16,281 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 22:20:16,281 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:16,281 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 22:20:16,282 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 22:20:16,282 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 -> BIGGEST_EQUIVALENCE_CLASS 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 [2020-07-21 22:20:16,537 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 22:20:16,556 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 22:20:16,560 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 22:20:16,561 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 22:20:16,562 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 22:20:16,563 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_5-1.c [2020-07-21 22:20:16,632 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f9e087db8/2585bef8559046949fa3208e825736b3/FLAG5ecedf8a8 [2020-07-21 22:20:17,127 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 22:20:17,129 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_5-1.c [2020-07-21 22:20:17,136 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f9e087db8/2585bef8559046949fa3208e825736b3/FLAG5ecedf8a8 [2020-07-21 22:20:17,530 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f9e087db8/2585bef8559046949fa3208e825736b3 [2020-07-21 22:20:17,541 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 22:20:17,544 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 22:20:17,545 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 22:20:17,545 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 22:20:17,549 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 22:20:17,550 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:20:17" (1/1) ... [2020-07-21 22:20:17,553 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3e10ba91 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:20:17, skipping insertion in model container [2020-07-21 22:20:17,553 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:20:17" (1/1) ... [2020-07-21 22:20:17,561 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 22:20:17,580 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 22:20:17,783 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:20:17,786 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 22:20:17,802 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:20:17,816 INFO L208 MainTranslator]: Completed translation [2020-07-21 22:20:17,816 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:20:17 WrapperNode [2020-07-21 22:20:17,817 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 22:20:17,817 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 22:20:17,817 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 22:20:17,818 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 22:20:17,829 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:20:17" (1/1) ... [2020-07-21 22:20:17,829 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:20:17" (1/1) ... [2020-07-21 22:20:17,833 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:20:17" (1/1) ... [2020-07-21 22:20:17,833 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:20:17" (1/1) ... [2020-07-21 22:20:17,836 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:20:17" (1/1) ... [2020-07-21 22:20:17,838 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:20:17" (1/1) ... [2020-07-21 22:20:17,839 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:20:17" (1/1) ... [2020-07-21 22:20:17,840 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 22:20:17,840 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 22:20:17,841 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 22:20:17,841 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 22:20:17,842 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:20:17" (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 [2020-07-21 22:20:17,986 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 22:20:17,986 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 22:20:17,986 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 22:20:17,986 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 22:20:17,987 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 22:20:17,987 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 22:20:17,987 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 22:20:17,987 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 22:20:17,987 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 22:20:17,987 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 22:20:18,147 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 22:20:18,147 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 22:20:18,150 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:20:18 BoogieIcfgContainer [2020-07-21 22:20:18,150 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 22:20:18,151 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 22:20:18,152 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 22:20:18,154 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 22:20:18,154 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:20:17" (1/3) ... [2020-07-21 22:20:18,155 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@71b6e4e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:20:18, skipping insertion in model container [2020-07-21 22:20:18,155 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:20:17" (2/3) ... [2020-07-21 22:20:18,155 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@71b6e4e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:20:18, skipping insertion in model container [2020-07-21 22:20:18,156 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:20:18" (3/3) ... [2020-07-21 22:20:18,157 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_5-1.c [2020-07-21 22:20:18,164 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 22:20:18,171 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 22:20:18,184 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 22:20:18,207 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 22:20:18,207 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 22:20:18,207 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 22:20:18,207 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 22:20:18,208 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 22:20:18,208 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 22:20:18,208 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 22:20:18,208 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 22:20:18,223 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 22:20:18,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 22:20:18,228 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:18,229 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:18,229 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:18,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:18,235 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 22:20:18,242 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:18,243 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [519701623] [2020-07-21 22:20:18,243 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 [2020-07-21 22:20:18,302 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:20:18,302 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:18,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:20:18,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:18,411 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:20:18,411 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:20:18,413 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [519701623] [2020-07-21 22:20:18,413 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:20:18,414 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:20:18,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32275932] [2020-07-21 22:20:18,420 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:20:18,421 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:18,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:20:18,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:20:18,440 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 22:20:18,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:18,553 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 22:20:18,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:20:18,555 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 22:20:18,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:18,567 INFO L225 Difference]: With dead ends: 35 [2020-07-21 22:20:18,567 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 22:20:18,571 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 [2020-07-21 22:20:18,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 22:20:18,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 22:20:18,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 22:20:18,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 22:20:18,649 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 22:20:18,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:18,650 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 22:20:18,650 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:20:18,650 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 22:20:18,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 22:20:18,652 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:18,653 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:18,859 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:18,860 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:18,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:18,862 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 22:20:18,862 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:18,863 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [834044509] [2020-07-21 22:20:18,863 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 [2020-07-21 22:20:18,895 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:20:18,895 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:18,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:20:18,898 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:18,945 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 22:20:18,946 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:20:18,946 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [834044509] [2020-07-21 22:20:18,946 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:20:18,947 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:20:18,947 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1406843279] [2020-07-21 22:20:18,949 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:20:18,949 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:18,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:20:18,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:20:18,950 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 22:20:19,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:19,026 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 22:20:19,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:20:19,027 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 22:20:19,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:19,028 INFO L225 Difference]: With dead ends: 27 [2020-07-21 22:20:19,028 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 22:20:19,030 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 [2020-07-21 22:20:19,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 22:20:19,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 22:20:19,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 22:20:19,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 22:20:19,038 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 22:20:19,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:19,039 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 22:20:19,039 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:20:19,039 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 22:20:19,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 22:20:19,041 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:19,041 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:19,256 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:19,257 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:19,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:19,259 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 22:20:19,260 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:19,260 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [674370116] [2020-07-21 22:20:19,261 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 [2020-07-21 22:20:19,289 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:20:19,290 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:19,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 22:20:19,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:19,340 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 22:20:19,340 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:19,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:19,550 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 22:20:19,550 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [674370116] [2020-07-21 22:20:19,551 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:19,551 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 22:20:19,551 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865169829] [2020-07-21 22:20:19,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 22:20:19,552 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:19,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 22:20:19,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 22:20:19,553 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 22:20:19,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:19,704 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 22:20:19,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 22:20:19,705 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 22:20:19,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:19,708 INFO L225 Difference]: With dead ends: 32 [2020-07-21 22:20:19,708 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 22:20:19,709 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:20:19,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 22:20:19,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 22:20:19,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 22:20:19,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 22:20:19,727 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 22:20:19,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:19,727 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 22:20:19,727 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 22:20:19,728 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 22:20:19,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 22:20:19,731 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:19,731 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:19,944 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:19,945 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:19,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:19,946 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 22:20:19,947 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:19,948 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1377253669] [2020-07-21 22:20:19,948 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 [2020-07-21 22:20:19,980 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:20:19,980 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:19,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 22:20:19,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:20,027 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 22:20:20,028 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:20,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:20,200 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 22:20:20,201 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1377253669] [2020-07-21 22:20:20,201 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:20,201 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 22:20:20,201 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [634898816] [2020-07-21 22:20:20,202 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 22:20:20,202 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:20,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 22:20:20,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 22:20:20,203 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 22:20:20,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:20,313 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 22:20:20,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 22:20:20,315 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 22:20:20,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:20,317 INFO L225 Difference]: With dead ends: 37 [2020-07-21 22:20:20,318 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 22:20:20,321 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:20:20,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 22:20:20,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 22:20:20,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 22:20:20,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 22:20:20,343 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 22:20:20,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:20,343 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 22:20:20,343 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 22:20:20,344 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 22:20:20,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 22:20:20,348 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:20,349 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:20,562 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:20,563 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:20,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:20,563 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 22:20:20,564 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:20,564 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1930241350] [2020-07-21 22:20:20,564 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 [2020-07-21 22:20:20,591 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:20:20,592 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:20,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:20:20,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:20,645 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 22:20:20,645 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:20,894 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:20,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:20,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:20,944 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:20,976 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 22:20:20,977 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1930241350] [2020-07-21 22:20:20,977 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:20,977 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 22:20:20,978 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [60489949] [2020-07-21 22:20:20,978 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 22:20:20,979 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:20,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 22:20:20,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:20:20,980 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 22:20:21,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:21,119 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 22:20:21,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 22:20:21,120 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 22:20:21,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:21,122 INFO L225 Difference]: With dead ends: 42 [2020-07-21 22:20:21,122 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 22:20:21,123 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:20:21,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 22:20:21,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 22:20:21,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 22:20:21,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 22:20:21,133 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 22:20:21,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:21,134 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 22:20:21,134 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 22:20:21,134 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 22:20:21,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 22:20:21,136 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:21,136 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:21,337 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:21,338 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:21,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:21,339 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 22:20:21,340 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:21,340 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [581134077] [2020-07-21 22:20:21,341 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 [2020-07-21 22:20:21,367 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:20:21,367 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:21,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:20:21,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:21,430 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-21 22:20:21,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:21,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:21,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:21,686 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:21,735 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 22:20:21,735 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [581134077] [2020-07-21 22:20:21,736 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:21,736 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 22:20:21,736 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1349648971] [2020-07-21 22:20:21,736 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 22:20:21,737 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:21,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 22:20:21,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:20:21,738 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 22:20:21,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:21,871 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 22:20:21,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 22:20:21,872 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 22:20:21,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:21,875 INFO L225 Difference]: With dead ends: 47 [2020-07-21 22:20:21,875 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 22:20:21,876 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:20:21,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 22:20:21,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 22:20:21,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 22:20:21,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 22:20:21,886 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 22:20:21,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:21,887 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 22:20:21,887 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 22:20:21,887 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 22:20:21,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 22:20:21,889 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:21,889 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:22,095 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:22,097 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:22,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:22,098 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 22:20:22,098 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:22,099 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [16916019] [2020-07-21 22:20:22,099 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 [2020-07-21 22:20:22,136 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:20:22,136 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:22,137 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:20:22,140 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:22,193 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-21 22:20:22,193 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:22,609 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:22,701 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:22,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:22,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:22,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:22,798 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 22:20:22,799 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [16916019] [2020-07-21 22:20:22,799 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:22,799 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 22:20:22,800 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161583738] [2020-07-21 22:20:22,802 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 22:20:22,803 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:22,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 22:20:22,803 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:20:22,803 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 22:20:22,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:22,971 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 22:20:22,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:20:22,972 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 22:20:22,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:22,975 INFO L225 Difference]: With dead ends: 52 [2020-07-21 22:20:22,978 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 22:20:22,979 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:20:22,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 22:20:23,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 22:20:23,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 22:20:23,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 22:20:23,004 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 22:20:23,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:23,005 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 22:20:23,005 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 22:20:23,005 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 22:20:23,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 22:20:23,009 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:23,014 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:23,229 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:23,230 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:23,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:23,231 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 22:20:23,232 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:23,232 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1166099288] [2020-07-21 22:20:23,233 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 [2020-07-21 22:20:23,268 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:20:23,269 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:23,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:20:23,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:23,356 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-21 22:20:23,357 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:23,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:23,879 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:23,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:23,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:23,982 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-21 22:20:23,982 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1166099288] [2020-07-21 22:20:23,982 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:23,983 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 12 [2020-07-21 22:20:23,984 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1882818646] [2020-07-21 22:20:23,986 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 22:20:23,986 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:23,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 22:20:23,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-07-21 22:20:23,987 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 12 states. [2020-07-21 22:20:24,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:24,095 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 22:20:24,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:20:24,097 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 96 [2020-07-21 22:20:24,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:24,100 INFO L225 Difference]: With dead ends: 57 [2020-07-21 22:20:24,100 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 22:20:24,101 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 9 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=85, Invalid=155, Unknown=0, NotChecked=0, Total=240 [2020-07-21 22:20:24,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 22:20:24,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 22:20:24,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 22:20:24,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 22:20:24,114 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 22:20:24,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:24,114 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 22:20:24,114 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 22:20:24,115 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 22:20:24,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 22:20:24,117 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:24,117 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:24,332 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:24,333 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:24,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:24,335 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 22:20:24,335 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:24,336 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [511099863] [2020-07-21 22:20:24,336 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 [2020-07-21 22:20:24,408 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:20:24,409 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:24,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:20:24,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:24,516 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-21 22:20:24,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:25,070 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:25,071 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:25,241 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:25,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:25,374 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:25,420 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 22:20:25,420 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [511099863] [2020-07-21 22:20:25,420 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:25,420 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-21 22:20:25,421 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1828496123] [2020-07-21 22:20:25,421 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 22:20:25,422 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:25,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 22:20:25,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:20:25,422 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 14 states. [2020-07-21 22:20:25,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:25,633 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 22:20:25,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:20:25,633 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 117 [2020-07-21 22:20:25,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:25,636 INFO L225 Difference]: With dead ends: 62 [2020-07-21 22:20:25,636 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 22:20:25,637 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-21 22:20:25,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 22:20:25,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 22:20:25,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 22:20:25,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 22:20:25,650 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 22:20:25,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:25,651 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 22:20:25,651 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 22:20:25,651 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 22:20:25,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 22:20:25,654 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:25,654 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:25,869 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:25,870 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:25,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:25,871 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 22:20:25,871 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:25,872 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [917435902] [2020-07-21 22:20:25,873 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 [2020-07-21 22:20:25,942 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:20:25,942 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:25,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:20:25,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:26,033 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 221 proven. 407 refuted. 0 times theorem prover too weak. 1298 trivial. 0 not checked. [2020-07-21 22:20:26,033 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:26,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:26,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:26,892 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:26,969 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:26,970 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:27,021 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:27,022 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:27,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:27,129 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 223 proven. 427 refuted. 0 times theorem prover too weak. 1276 trivial. 0 not checked. [2020-07-21 22:20:27,129 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [917435902] [2020-07-21 22:20:27,129 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:27,129 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-21 22:20:27,130 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [501342246] [2020-07-21 22:20:27,130 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 22:20:27,131 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:27,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 22:20:27,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:20:27,131 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 14 states. [2020-07-21 22:20:27,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:27,319 INFO L93 Difference]: Finished difference Result 88 states and 260 transitions. [2020-07-21 22:20:27,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:20:27,319 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 190 [2020-07-21 22:20:27,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:27,321 INFO L225 Difference]: With dead ends: 88 [2020-07-21 22:20:27,321 INFO L226 Difference]: Without dead ends: 49 [2020-07-21 22:20:27,325 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-21 22:20:27,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-07-21 22:20:27,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-07-21 22:20:27,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-07-21 22:20:27,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 70 transitions. [2020-07-21 22:20:27,334 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 70 transitions. Word has length 190 [2020-07-21 22:20:27,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:27,335 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 70 transitions. [2020-07-21 22:20:27,335 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 22:20:27,335 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 70 transitions. [2020-07-21 22:20:27,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2020-07-21 22:20:27,339 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:27,339 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 15, 9, 9, 9, 9, 9, 9, 9, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:27,553 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:27,553 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:27,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:27,554 INFO L82 PathProgramCache]: Analyzing trace with hash -1040445716, now seen corresponding path program 5 times [2020-07-21 22:20:27,555 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:27,555 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1427184595] [2020-07-21 22:20:27,555 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 [2020-07-21 22:20:27,621 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:20:27,621 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:27,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:20:27,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:27,682 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 274 proven. 108 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2020-07-21 22:20:27,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:28,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:28,388 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:28,466 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:28,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:28,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:28,554 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:28,642 INFO L134 CoverageAnalysis]: Checked inductivity of 933 backedges. 274 proven. 130 refuted. 0 times theorem prover too weak. 529 trivial. 0 not checked. [2020-07-21 22:20:28,642 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1427184595] [2020-07-21 22:20:28,642 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:28,643 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-21 22:20:28,643 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1840902859] [2020-07-21 22:20:28,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 22:20:28,644 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:28,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 22:20:28,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:20:28,644 INFO L87 Difference]: Start difference. First operand 49 states and 70 transitions. Second operand 14 states. [2020-07-21 22:20:28,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:28,818 INFO L93 Difference]: Finished difference Result 67 states and 91 transitions. [2020-07-21 22:20:28,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:20:28,820 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 136 [2020-07-21 22:20:28,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:28,822 INFO L225 Difference]: With dead ends: 67 [2020-07-21 22:20:28,822 INFO L226 Difference]: Without dead ends: 60 [2020-07-21 22:20:28,824 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 248 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-21 22:20:28,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-21 22:20:28,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 54. [2020-07-21 22:20:28,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-21 22:20:28,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 77 transitions. [2020-07-21 22:20:28,833 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 77 transitions. Word has length 136 [2020-07-21 22:20:28,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:28,833 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 77 transitions. [2020-07-21 22:20:28,834 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 22:20:28,834 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 77 transitions. [2020-07-21 22:20:28,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 22:20:28,836 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:28,836 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:29,049 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:29,050 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:29,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:29,051 INFO L82 PathProgramCache]: Analyzing trace with hash 1200034344, now seen corresponding path program 6 times [2020-07-21 22:20:29,051 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:29,052 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [816981864] [2020-07-21 22:20:29,052 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 [2020-07-21 22:20:29,130 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:20:29,131 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:29,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 63 conjunts are in the unsatisfiable core [2020-07-21 22:20:29,135 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:29,284 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 185 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2020-07-21 22:20:29,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:30,109 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 185 refuted. 0 times theorem prover too weak. 385 trivial. 0 not checked. [2020-07-21 22:20:30,109 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [816981864] [2020-07-21 22:20:30,109 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:30,110 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 20 [2020-07-21 22:20:30,110 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779441372] [2020-07-21 22:20:30,110 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 22:20:30,111 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:30,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 22:20:30,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=335, Unknown=0, NotChecked=0, Total=380 [2020-07-21 22:20:30,111 INFO L87 Difference]: Start difference. First operand 54 states and 77 transitions. Second operand 20 states. [2020-07-21 22:20:30,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:30,379 INFO L93 Difference]: Finished difference Result 112 states and 191 transitions. [2020-07-21 22:20:30,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 22:20:30,379 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 109 [2020-07-21 22:20:30,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:30,385 INFO L225 Difference]: With dead ends: 112 [2020-07-21 22:20:30,385 INFO L226 Difference]: Without dead ends: 105 [2020-07-21 22:20:30,388 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 195 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=409, Unknown=0, NotChecked=0, Total=462 [2020-07-21 22:20:30,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2020-07-21 22:20:30,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 81. [2020-07-21 22:20:30,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-21 22:20:30,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 145 transitions. [2020-07-21 22:20:30,433 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 145 transitions. Word has length 109 [2020-07-21 22:20:30,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:30,434 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 145 transitions. [2020-07-21 22:20:30,434 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 22:20:30,434 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 145 transitions. [2020-07-21 22:20:30,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 22:20:30,439 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:30,439 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 8, 8, 8, 8, 8, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:30,651 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:30,652 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:30,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:30,653 INFO L82 PathProgramCache]: Analyzing trace with hash 1883621107, now seen corresponding path program 7 times [2020-07-21 22:20:30,653 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:30,654 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1256357224] [2020-07-21 22:20:30,654 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 [2020-07-21 22:20:30,744 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 22:20:30,744 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:30,745 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 22:20:30,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:30,829 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 184 proven. 46 refuted. 0 times theorem prover too weak. 492 trivial. 0 not checked. [2020-07-21 22:20:30,829 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:31,099 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:31,100 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:31,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:31,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:31,203 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:31,240 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:31,293 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 182 proven. 55 refuted. 0 times theorem prover too weak. 485 trivial. 0 not checked. [2020-07-21 22:20:31,294 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1256357224] [2020-07-21 22:20:31,294 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:31,294 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10] total 12 [2020-07-21 22:20:31,294 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1356159554] [2020-07-21 22:20:31,295 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 22:20:31,295 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:31,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 22:20:31,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-07-21 22:20:31,296 INFO L87 Difference]: Start difference. First operand 81 states and 145 transitions. Second operand 12 states. [2020-07-21 22:20:31,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:31,407 INFO L93 Difference]: Finished difference Result 111 states and 196 transitions. [2020-07-21 22:20:31,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:20:31,408 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 121 [2020-07-21 22:20:31,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:31,410 INFO L225 Difference]: With dead ends: 111 [2020-07-21 22:20:31,410 INFO L226 Difference]: Without dead ends: 104 [2020-07-21 22:20:31,413 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 224 SyntacticMatches, 7 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=75, Invalid=135, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:20:31,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-07-21 22:20:31,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 81. [2020-07-21 22:20:31,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-07-21 22:20:31,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 145 transitions. [2020-07-21 22:20:31,444 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 145 transitions. Word has length 121 [2020-07-21 22:20:31,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:31,447 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 145 transitions. [2020-07-21 22:20:31,447 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 22:20:31,447 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 145 transitions. [2020-07-21 22:20:31,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 22:20:31,451 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:31,451 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 8, 8, 8, 8, 8, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:31,665 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:31,666 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:31,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:31,666 INFO L82 PathProgramCache]: Analyzing trace with hash -1349477645, now seen corresponding path program 8 times [2020-07-21 22:20:31,666 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:31,667 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [729460195] [2020-07-21 22:20:31,667 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 [2020-07-21 22:20:31,749 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:20:31,749 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:31,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 22:20:31,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:31,834 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 233 proven. 55 refuted. 0 times theorem prover too weak. 434 trivial. 0 not checked. [2020-07-21 22:20:31,834 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:32,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:32,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:32,424 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:32,489 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:32,547 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 230 proven. 70 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-21 22:20:32,547 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [729460195] [2020-07-21 22:20:32,548 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:32,548 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 14 [2020-07-21 22:20:32,548 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [831994843] [2020-07-21 22:20:32,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 22:20:32,549 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:32,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 22:20:32,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:20:32,550 INFO L87 Difference]: Start difference. First operand 81 states and 145 transitions. Second operand 14 states. [2020-07-21 22:20:32,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:32,717 INFO L93 Difference]: Finished difference Result 97 states and 160 transitions. [2020-07-21 22:20:32,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:20:32,717 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 121 [2020-07-21 22:20:32,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:32,720 INFO L225 Difference]: With dead ends: 97 [2020-07-21 22:20:32,720 INFO L226 Difference]: Without dead ends: 90 [2020-07-21 22:20:32,722 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 220 SyntacticMatches, 9 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=198, Unknown=0, NotChecked=0, Total=306 [2020-07-21 22:20:32,723 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-07-21 22:20:32,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 71. [2020-07-21 22:20:32,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 22:20:32,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 123 transitions. [2020-07-21 22:20:32,736 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 123 transitions. Word has length 121 [2020-07-21 22:20:32,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:32,739 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 123 transitions. [2020-07-21 22:20:32,739 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 22:20:32,739 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 123 transitions. [2020-07-21 22:20:32,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 22:20:32,742 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:32,742 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 8, 8, 8, 8, 8, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:32,955 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:32,956 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:32,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:32,957 INFO L82 PathProgramCache]: Analyzing trace with hash -280177283, now seen corresponding path program 9 times [2020-07-21 22:20:32,957 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:32,958 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1363554959] [2020-07-21 22:20:32,958 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 22:20:33,032 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:20:33,032 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:33,033 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 22:20:33,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:33,110 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 147 proven. 141 refuted. 0 times theorem prover too weak. 434 trivial. 0 not checked. [2020-07-21 22:20:33,111 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:33,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:33,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:33,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:33,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:33,776 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:33,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:33,868 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 146 proven. 154 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-21 22:20:33,868 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1363554959] [2020-07-21 22:20:33,868 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:33,869 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 14 [2020-07-21 22:20:33,869 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229982886] [2020-07-21 22:20:33,870 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 22:20:33,870 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:33,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 22:20:33,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:20:33,872 INFO L87 Difference]: Start difference. First operand 71 states and 123 transitions. Second operand 14 states. [2020-07-21 22:20:34,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:34,033 INFO L93 Difference]: Finished difference Result 107 states and 179 transitions. [2020-07-21 22:20:34,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:20:34,034 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 121 [2020-07-21 22:20:34,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:34,036 INFO L225 Difference]: With dead ends: 107 [2020-07-21 22:20:34,036 INFO L226 Difference]: Without dead ends: 71 [2020-07-21 22:20:34,040 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 220 SyntacticMatches, 9 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=108, Invalid=198, Unknown=0, NotChecked=0, Total=306 [2020-07-21 22:20:34,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-21 22:20:34,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 61. [2020-07-21 22:20:34,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 22:20:34,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 95 transitions. [2020-07-21 22:20:34,053 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 95 transitions. Word has length 121 [2020-07-21 22:20:34,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:34,054 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 95 transitions. [2020-07-21 22:20:34,054 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 22:20:34,055 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 95 transitions. [2020-07-21 22:20:34,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-07-21 22:20:34,059 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:34,060 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 13, 7, 7, 7, 7, 7, 7, 7, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:34,272 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:34,273 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:34,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:34,273 INFO L82 PathProgramCache]: Analyzing trace with hash -1402909364, now seen corresponding path program 10 times [2020-07-21 22:20:34,273 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:34,274 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2054692976] [2020-07-21 22:20:34,274 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 [2020-07-21 22:20:34,361 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:20:34,362 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:34,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:20:34,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:34,418 INFO L134 CoverageAnalysis]: Checked inductivity of 582 backedges. 78 proven. 202 refuted. 0 times theorem prover too weak. 302 trivial. 0 not checked. [2020-07-21 22:20:34,419 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:34,968 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:34,969 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:35,113 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:35,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:35,228 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:35,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:35,276 INFO L134 CoverageAnalysis]: Checked inductivity of 582 backedges. 84 proven. 218 refuted. 0 times theorem prover too weak. 280 trivial. 0 not checked. [2020-07-21 22:20:35,277 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2054692976] [2020-07-21 22:20:35,277 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:35,277 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 14 [2020-07-21 22:20:35,278 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643625555] [2020-07-21 22:20:35,278 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 22:20:35,278 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:35,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 22:20:35,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:20:35,279 INFO L87 Difference]: Start difference. First operand 61 states and 95 transitions. Second operand 14 states. [2020-07-21 22:20:35,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:35,454 INFO L93 Difference]: Finished difference Result 109 states and 171 transitions. [2020-07-21 22:20:35,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:20:35,455 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 110 [2020-07-21 22:20:35,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:35,457 INFO L225 Difference]: With dead ends: 109 [2020-07-21 22:20:35,457 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 22:20:35,459 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 196 SyntacticMatches, 11 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=222, Unknown=0, NotChecked=0, Total=342 [2020-07-21 22:20:35,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 22:20:35,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-07-21 22:20:35,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-07-21 22:20:35,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 72 transitions. [2020-07-21 22:20:35,467 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 72 transitions. Word has length 110 [2020-07-21 22:20:35,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:35,467 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 72 transitions. [2020-07-21 22:20:35,467 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 22:20:35,467 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 72 transitions. [2020-07-21 22:20:35,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 22:20:35,470 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:35,470 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 8, 8, 8, 8, 8, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:35,683 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:35,684 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:35,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:35,684 INFO L82 PathProgramCache]: Analyzing trace with hash 1072341053, now seen corresponding path program 11 times [2020-07-21 22:20:35,685 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:35,685 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1761556071] [2020-07-21 22:20:35,685 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 [2020-07-21 22:20:35,765 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:20:35,765 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:35,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 138 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 22:20:35,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:35,827 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 113 proven. 175 refuted. 0 times theorem prover too weak. 434 trivial. 0 not checked. [2020-07-21 22:20:35,828 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:36,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:36,273 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:36,400 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:36,401 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:36,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:36,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:36,541 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:36,566 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 114 proven. 186 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-21 22:20:36,569 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1761556071] [2020-07-21 22:20:36,573 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:36,574 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12] total 14 [2020-07-21 22:20:36,574 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660951732] [2020-07-21 22:20:36,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 22:20:36,575 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:36,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 22:20:36,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=126, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:20:36,576 INFO L87 Difference]: Start difference. First operand 58 states and 72 transitions. Second operand 14 states. [2020-07-21 22:20:36,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:36,681 INFO L93 Difference]: Finished difference Result 75 states and 90 transitions. [2020-07-21 22:20:36,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:20:36,683 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 121 [2020-07-21 22:20:36,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:36,684 INFO L225 Difference]: With dead ends: 75 [2020-07-21 22:20:36,684 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 22:20:36,685 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 220 SyntacticMatches, 9 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 59 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=108, Invalid=198, Unknown=0, NotChecked=0, Total=306 [2020-07-21 22:20:36,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 22:20:36,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-07-21 22:20:36,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-21 22:20:36,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 61 transitions. [2020-07-21 22:20:36,695 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 61 transitions. Word has length 121 [2020-07-21 22:20:36,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:36,695 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 61 transitions. [2020-07-21 22:20:36,695 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 22:20:36,695 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 61 transitions. [2020-07-21 22:20:36,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 22:20:36,697 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:20:36,697 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 8, 8, 8, 8, 8, 8, 8, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:20:36,910 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:36,911 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:20:36,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:20:36,911 INFO L82 PathProgramCache]: Analyzing trace with hash -419017667, now seen corresponding path program 12 times [2020-07-21 22:20:36,911 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:20:36,912 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1691515218] [2020-07-21 22:20:36,912 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 [2020-07-21 22:20:36,985 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:20:36,985 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:20:36,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 22:20:36,988 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:20:37,057 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 116 proven. 217 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2020-07-21 22:20:37,057 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:37,712 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:37,887 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:37,888 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:37,999 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:38,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:38,071 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:38,072 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:20:38,136 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 112 proven. 243 refuted. 0 times theorem prover too weak. 367 trivial. 0 not checked. [2020-07-21 22:20:38,137 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1691515218] [2020-07-21 22:20:38,137 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:20:38,137 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14] total 16 [2020-07-21 22:20:38,137 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693221953] [2020-07-21 22:20:38,138 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 22:20:38,138 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:20:38,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 22:20:38,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=168, Unknown=0, NotChecked=0, Total=240 [2020-07-21 22:20:38,139 INFO L87 Difference]: Start difference. First operand 53 states and 61 transitions. Second operand 16 states. [2020-07-21 22:20:38,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:20:38,324 INFO L93 Difference]: Finished difference Result 77 states and 90 transitions. [2020-07-21 22:20:38,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 22:20:38,325 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 121 [2020-07-21 22:20:38,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:20:38,325 INFO L225 Difference]: With dead ends: 77 [2020-07-21 22:20:38,325 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 22:20:38,329 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 216 SyntacticMatches, 11 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=147, Invalid=273, Unknown=0, NotChecked=0, Total=420 [2020-07-21 22:20:38,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 22:20:38,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 22:20:38,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 22:20:38,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 22:20:38,330 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 121 [2020-07-21 22:20:38,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:20:38,330 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 22:20:38,330 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 22:20:38,330 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 22:20:38,330 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 22:20:38,536 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:20:38,540 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 22:20:38,863 WARN L193 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 108 DAG size of output: 38 [2020-07-21 22:20:39,015 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 35 [2020-07-21 22:20:39,177 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 35 [2020-07-21 22:20:39,327 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 35 [2020-07-21 22:20:39,454 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 129 DAG size of output: 35 [2020-07-21 22:20:39,727 WARN L193 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 144 DAG size of output: 72 [2020-07-21 22:20:39,876 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 128 DAG size of output: 43 [2020-07-21 22:20:39,999 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 35 [2020-07-21 22:20:40,110 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 35 [2020-07-21 22:20:40,578 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 35 [2020-07-21 22:20:40,681 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 140 DAG size of output: 35 [2020-07-21 22:20:40,782 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 134 DAG size of output: 43 [2020-07-21 22:20:42,216 WARN L193 SmtUtils]: Spent 608.00 ms on a formula simplification. DAG size of input: 101 DAG size of output: 30 [2020-07-21 22:20:42,238 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 22:20:42,238 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 22:20:42,238 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 22:20:42,238 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 22:20:42,238 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 22:20:42,238 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 22:20:42,239 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 27) no Hoare annotation was computed. [2020-07-21 22:20:42,239 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 23 30) the Hoare annotation is: true [2020-07-21 22:20:42,239 INFO L268 CegarLoopResult]: For program point L27(line 27) no Hoare annotation was computed. [2020-07-21 22:20:42,239 INFO L268 CegarLoopResult]: For program point L26(lines 26 28) no Hoare annotation was computed. [2020-07-21 22:20:42,239 INFO L264 CegarLoopResult]: At program point L25(line 25) the Hoare annotation is: (and (<= main_~x~0 5) (<= 5 main_~x~0)) [2020-07-21 22:20:42,239 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 23 30) no Hoare annotation was computed. [2020-07-21 22:20:42,239 INFO L268 CegarLoopResult]: For program point L25-1(line 25) no Hoare annotation was computed. [2020-07-21 22:20:42,239 INFO L268 CegarLoopResult]: For program point L26-2(lines 26 28) no Hoare annotation was computed. [2020-07-21 22:20:42,239 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 23 30) no Hoare annotation was computed. [2020-07-21 22:20:42,240 INFO L268 CegarLoopResult]: For program point fiboEXIT(lines 5 13) no Hoare annotation was computed. [2020-07-21 22:20:42,240 INFO L268 CegarLoopResult]: For program point fiboFINAL(lines 5 13) no Hoare annotation was computed. [2020-07-21 22:20:42,240 INFO L264 CegarLoopResult]: At program point L11(line 11) the Hoare annotation is: (and (<= fibo_~n |fibo_#in~n|) (<= |fibo_#in~n| fibo_~n) (<= 2 |fibo_#in~n|)) [2020-07-21 22:20:42,240 INFO L268 CegarLoopResult]: For program point L11-1(line 11) no Hoare annotation was computed. [2020-07-21 22:20:42,240 INFO L264 CegarLoopResult]: At program point L11-2(line 11) the Hoare annotation is: (and (let ((.cse0 (= |fibo_#t~ret0| 1)) (.cse1 (<= fibo_~n |fibo_#in~n|)) (.cse2 (<= |fibo_#in~n| fibo_~n))) (or (and .cse0 .cse1 .cse2 (<= 3 |fibo_#in~n|) (<= |fibo_#in~n| 3)) (and (<= 5 |fibo_#in~n|) .cse1 .cse2) (and (<= 4 |fibo_#in~n|) .cse1 (= |fibo_#t~ret0| 2) .cse2) (and .cse0 .cse1 (<= |fibo_#in~n| 2) .cse2 (<= 2 |fibo_#in~n|)))) (or (<= |fibo_#in~n| 4) (<= 6 |fibo_#in~n|) (= |fibo_#t~ret0| 3))) [2020-07-21 22:20:42,240 INFO L268 CegarLoopResult]: For program point L8(lines 8 12) no Hoare annotation was computed. [2020-07-21 22:20:42,240 INFO L268 CegarLoopResult]: For program point L11-3(line 11) no Hoare annotation was computed. [2020-07-21 22:20:42,240 INFO L268 CegarLoopResult]: For program point L6(lines 6 12) no Hoare annotation was computed. [2020-07-21 22:20:42,241 INFO L271 CegarLoopResult]: At program point fiboENTRY(lines 5 13) the Hoare annotation is: true [2020-07-21 22:20:42,246 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 10:20:42 BoogieIcfgContainer [2020-07-21 22:20:42,246 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 22:20:42,248 INFO L168 Benchmark]: Toolchain (without parser) took 24706.04 ms. Allocated memory was 138.9 MB in the beginning and 465.0 MB in the end (delta: 326.1 MB). Free memory was 102.2 MB in the beginning and 360.4 MB in the end (delta: -258.2 MB). Peak memory consumption was 314.5 MB. Max. memory is 7.1 GB. [2020-07-21 22:20:42,249 INFO L168 Benchmark]: CDTParser took 0.51 ms. Allocated memory is still 138.9 MB. Free memory was 120.7 MB in the beginning and 120.5 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. [2020-07-21 22:20:42,249 INFO L168 Benchmark]: CACSL2BoogieTranslator took 272.01 ms. Allocated memory is still 138.9 MB. Free memory was 101.8 MB in the beginning and 92.6 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-07-21 22:20:42,250 INFO L168 Benchmark]: Boogie Preprocessor took 22.66 ms. Allocated memory is still 138.9 MB. Free memory was 92.6 MB in the beginning and 91.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-21 22:20:42,250 INFO L168 Benchmark]: RCFGBuilder took 310.06 ms. Allocated memory was 138.9 MB in the beginning and 202.4 MB in the end (delta: 63.4 MB). Free memory was 91.2 MB in the beginning and 169.9 MB in the end (delta: -78.7 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. [2020-07-21 22:20:42,251 INFO L168 Benchmark]: TraceAbstraction took 24095.16 ms. Allocated memory was 202.4 MB in the beginning and 465.0 MB in the end (delta: 262.7 MB). Free memory was 169.9 MB in the beginning and 360.4 MB in the end (delta: -190.5 MB). Peak memory consumption was 318.8 MB. Max. memory is 7.1 GB. [2020-07-21 22:20:42,253 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.51 ms. Allocated memory is still 138.9 MB. Free memory was 120.7 MB in the beginning and 120.5 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 272.01 ms. Allocated memory is still 138.9 MB. Free memory was 101.8 MB in the beginning and 92.6 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 22.66 ms. Allocated memory is still 138.9 MB. Free memory was 92.6 MB in the beginning and 91.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 310.06 ms. Allocated memory was 138.9 MB in the beginning and 202.4 MB in the end (delta: 63.4 MB). Free memory was 91.2 MB in the beginning and 169.9 MB in the end (delta: -78.7 MB). Peak memory consumption was 13.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 24095.16 ms. Allocated memory was 202.4 MB in the beginning and 465.0 MB in the end (delta: 262.7 MB). Free memory was 169.9 MB in the beginning and 360.4 MB in the end (delta: -190.5 MB). Peak memory consumption was 318.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 27]: 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 4 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 20.3s, OverallIterations: 18, TraceHistogramMax: 27, AutomataDifference: 2.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 3.6s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 400 SDtfs, 465 SDslu, 1734 SDs, 0 SdLazy, 1732 SolverSat, 450 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 3202 GetRequests, 2825 SyntacticMatches, 130 SemanticMatches, 247 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 739 ImplicationChecksByTransitivity, 2.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=81occurred in iteration=12, 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, 18 MinimizatonAttempts, 158 StatesRemovedByMinimization, 13 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 8 LocationsWithAnnotation, 95 PreInvPairs, 1722 NumberOfFragments, 89 HoareAnnotationTreeSize, 95 FomulaSimplifications, 1048005 FormulaSimplificationTreeSizeReduction, 3.0s HoareSimplificationTime, 8 FomulaSimplificationsInter, 2891 FormulaSimplificationTreeSizeReductionInter, 0.6s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 12.0s InterpolantComputationTime, 1588 NumberOfCodeBlocks, 910 NumberOfCodeBlocksAsserted, 40 NumberOfCheckSat, 3115 ConstructedInterpolants, 0 QuantifiedInterpolants, 656365 SizeOfPredicates, 77 NumberOfNonLiveVariables, 2035 ConjunctsInSsa, 222 ConjunctsInUnsatCore, 34 InterpolantComputations, 2 PerfectInterpolantSequences, 13692/18052 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...