/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 NUM_VARIABLES --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/loop-lit/jm2006_variant.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 17:59:04,345 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 17:59:04,349 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 17:59:04,373 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 17:59:04,373 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 17:59:04,375 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 17:59:04,377 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 17:59:04,392 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 17:59:04,397 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 17:59:04,399 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 17:59:04,400 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 17:59:04,403 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 17:59:04,403 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 17:59:04,405 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 17:59:04,406 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 17:59:04,410 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 17:59:04,412 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 17:59:04,413 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 17:59:04,415 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 17:59:04,422 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 17:59:04,425 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 17:59:04,429 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 17:59:04,434 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 17:59:04,435 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 17:59:04,439 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 17:59:04,452 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 17:59:04,452 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 17:59:04,454 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 17:59:04,455 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 17:59:04,481 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 17:59:04,481 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 17:59:04,484 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 17:59:04,484 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 17:59:04,484 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 17:59:04,484 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 17:59:04,485 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 17:59:04,485 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 17:59:04,485 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 17:59:04,485 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 17:59:04,486 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 17:59:04,487 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 17:59:04,487 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 17:59:04,488 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 17:59:04,488 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 17:59:04,488 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 17:59:04,488 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 17:59:04,488 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 17:59:04,489 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 17:59:04,489 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 17:59:04,489 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 17:59:04,489 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:59:04,490 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 17:59:04,490 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 17:59:04,490 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 17:59:04,490 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 17:59:04,490 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:04,491 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 17:59:04,491 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 17:59:04,491 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 -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 17:59:04,850 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 17:59:04,874 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 17:59:04,881 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 17:59:04,883 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 17:59:04,884 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 17:59:04,884 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/jm2006_variant.i [2020-07-20 17:59:04,982 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4ae676976/c7d049edf4b9408498ea257075c713a4/FLAG1d6b3b197 [2020-07-20 17:59:05,467 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 17:59:05,468 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/jm2006_variant.i [2020-07-20 17:59:05,475 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4ae676976/c7d049edf4b9408498ea257075c713a4/FLAG1d6b3b197 [2020-07-20 17:59:05,842 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4ae676976/c7d049edf4b9408498ea257075c713a4 [2020-07-20 17:59:05,854 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 17:59:05,858 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 17:59:05,860 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 17:59:05,860 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 17:59:05,864 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 17:59:05,865 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:59:05" (1/1) ... [2020-07-20 17:59:05,869 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2ab5a22d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:59:05, skipping insertion in model container [2020-07-20 17:59:05,869 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:59:05" (1/1) ... [2020-07-20 17:59:05,878 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 17:59:05,899 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 17:59:06,091 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:59:06,097 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 17:59:06,116 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:59:06,133 INFO L208 MainTranslator]: Completed translation [2020-07-20 17:59:06,134 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:59:06 WrapperNode [2020-07-20 17:59:06,134 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 17:59:06,135 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 17:59:06,135 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 17:59:06,135 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 17:59:06,147 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:59:06" (1/1) ... [2020-07-20 17:59:06,147 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:59:06" (1/1) ... [2020-07-20 17:59:06,153 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:59:06" (1/1) ... [2020-07-20 17:59:06,153 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:59:06" (1/1) ... [2020-07-20 17:59:06,158 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:59:06" (1/1) ... [2020-07-20 17:59:06,164 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:59:06" (1/1) ... [2020-07-20 17:59:06,165 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:59:06" (1/1) ... [2020-07-20 17:59:06,267 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 17:59:06,268 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 17:59:06,268 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 17:59:06,268 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 17:59:06,270 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:59:06" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:59:06,343 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 17:59:06,344 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 17:59:06,344 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 17:59:06,344 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 17:59:06,344 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 17:59:06,344 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 17:59:06,345 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 17:59:06,345 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 17:59:06,345 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 17:59:06,345 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 17:59:06,345 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 17:59:06,345 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 17:59:06,346 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 17:59:06,579 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 17:59:06,580 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 17:59:06,584 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:59:06 BoogieIcfgContainer [2020-07-20 17:59:06,584 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 17:59:06,586 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 17:59:06,586 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 17:59:06,590 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 17:59:06,590 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:59:05" (1/3) ... [2020-07-20 17:59:06,591 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@523a6314 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:59:06, skipping insertion in model container [2020-07-20 17:59:06,592 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:59:06" (2/3) ... [2020-07-20 17:59:06,592 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@523a6314 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:59:06, skipping insertion in model container [2020-07-20 17:59:06,592 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:59:06" (3/3) ... [2020-07-20 17:59:06,594 INFO L109 eAbstractionObserver]: Analyzing ICFG jm2006_variant.i [2020-07-20 17:59:06,607 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 17:59:06,616 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 17:59:06,631 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 17:59:06,659 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 17:59:06,659 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 17:59:06,659 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 17:59:06,659 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 17:59:06,660 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 17:59:06,660 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 17:59:06,660 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 17:59:06,661 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 17:59:06,679 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-07-20 17:59:06,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 17:59:06,686 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:59:06,687 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:59:06,688 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:59:06,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:59:06,694 INFO L82 PathProgramCache]: Analyzing trace with hash -362650722, now seen corresponding path program 1 times [2020-07-20 17:59:06,701 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:59:06,702 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1810779990] [2020-07-20 17:59:06,702 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:06,819 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:59:06,820 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:59:06,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 17:59:06,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:59:06,959 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 17:59:07,027 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:59:07,028 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:59:07,029 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1810779990] [2020-07-20 17:59:07,030 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:59:07,031 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-20 17:59:07,032 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92537415] [2020-07-20 17:59:07,038 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-20 17:59:07,039 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:59:07,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-20 17:59:07,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-07-20 17:59:07,059 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 7 states. [2020-07-20 17:59:07,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:59:07,264 INFO L93 Difference]: Finished difference Result 47 states and 59 transitions. [2020-07-20 17:59:07,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 17:59:07,267 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 13 [2020-07-20 17:59:07,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:59:07,278 INFO L225 Difference]: With dead ends: 47 [2020-07-20 17:59:07,278 INFO L226 Difference]: Without dead ends: 15 [2020-07-20 17:59:07,283 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-07-20 17:59:07,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-07-20 17:59:07,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-07-20 17:59:07,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-07-20 17:59:07,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-07-20 17:59:07,332 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-07-20 17:59:07,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:59:07,332 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-07-20 17:59:07,333 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-20 17:59:07,333 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-07-20 17:59:07,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 17:59:07,334 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:59:07,334 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:59:07,550 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:07,551 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:59:07,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:59:07,551 INFO L82 PathProgramCache]: Analyzing trace with hash -1126137131, now seen corresponding path program 1 times [2020-07-20 17:59:07,552 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:59:07,553 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [778435555] [2020-07-20 17:59:07,554 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:07,629 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:59:07,629 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:59:07,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 17:59:07,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:59:07,734 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:59:07,734 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:59:07,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:59:07,885 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:59:07,886 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [778435555] [2020-07-20 17:59:07,886 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:59:07,886 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2020-07-20 17:59:07,887 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [656493692] [2020-07-20 17:59:07,889 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 17:59:07,889 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:59:07,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 17:59:07,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2020-07-20 17:59:07,890 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 12 states. [2020-07-20 17:59:08,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:59:08,213 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-07-20 17:59:08,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 17:59:08,214 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 14 [2020-07-20 17:59:08,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:59:08,215 INFO L225 Difference]: With dead ends: 26 [2020-07-20 17:59:08,215 INFO L226 Difference]: Without dead ends: 18 [2020-07-20 17:59:08,219 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=227, Unknown=0, NotChecked=0, Total=306 [2020-07-20 17:59:08,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-20 17:59:08,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-20 17:59:08,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 17:59:08,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-07-20 17:59:08,234 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 14 [2020-07-20 17:59:08,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:59:08,235 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-07-20 17:59:08,235 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 17:59:08,235 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-07-20 17:59:08,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-20 17:59:08,236 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:59:08,238 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:59:08,441 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:08,442 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:59:08,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:59:08,443 INFO L82 PathProgramCache]: Analyzing trace with hash -1467221666, now seen corresponding path program 2 times [2020-07-20 17:59:08,443 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:59:08,443 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1177160954] [2020-07-20 17:59:08,443 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:08,487 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:59:08,488 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:59:08,489 WARN L261 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 37 conjunts are in the unsatisfiable core [2020-07-20 17:59:08,491 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:59:08,647 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:59:08,648 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:59:08,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:59:08,900 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:59:08,901 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1177160954] [2020-07-20 17:59:08,901 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:59:08,902 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2020-07-20 17:59:08,902 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638445362] [2020-07-20 17:59:08,903 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 17:59:08,903 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:59:08,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 17:59:08,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 17:59:08,904 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 18 states. [2020-07-20 17:59:09,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:59:09,548 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2020-07-20 17:59:09,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-20 17:59:09,549 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 17 [2020-07-20 17:59:09,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:59:09,551 INFO L225 Difference]: With dead ends: 32 [2020-07-20 17:59:09,551 INFO L226 Difference]: Without dead ends: 24 [2020-07-20 17:59:09,552 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=194, Invalid=562, Unknown=0, NotChecked=0, Total=756 [2020-07-20 17:59:09,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-20 17:59:09,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-20 17:59:09,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-20 17:59:09,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-07-20 17:59:09,560 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 17 [2020-07-20 17:59:09,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:59:09,560 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-07-20 17:59:09,561 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 17:59:09,561 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-07-20 17:59:09,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 17:59:09,562 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:59:09,562 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:59:09,763 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:09,763 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:59:09,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:59:09,764 INFO L82 PathProgramCache]: Analyzing trace with hash 2094249470, now seen corresponding path program 3 times [2020-07-20 17:59:09,764 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:59:09,764 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2069056747] [2020-07-20 17:59:09,765 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:09,811 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:59:09,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:59:09,814 WARN L261 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 73 conjunts are in the unsatisfiable core [2020-07-20 17:59:09,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:59:10,133 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:59:10,134 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:59:10,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:59:10,755 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:59:10,755 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2069056747] [2020-07-20 17:59:10,756 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:59:10,756 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 30 [2020-07-20 17:59:10,756 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29758143] [2020-07-20 17:59:10,757 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-20 17:59:10,757 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:59:10,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-20 17:59:10,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=684, Unknown=0, NotChecked=0, Total=870 [2020-07-20 17:59:10,760 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 30 states. [2020-07-20 17:59:11,414 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 52 [2020-07-20 17:59:11,730 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 51 [2020-07-20 17:59:12,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:59:12,796 INFO L93 Difference]: Finished difference Result 44 states and 55 transitions. [2020-07-20 17:59:12,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-20 17:59:12,797 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 23 [2020-07-20 17:59:12,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:59:12,799 INFO L225 Difference]: With dead ends: 44 [2020-07-20 17:59:12,799 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 17:59:12,801 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=566, Invalid=1504, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 17:59:12,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 17:59:12,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-20 17:59:12,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 17:59:12,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-07-20 17:59:12,815 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 23 [2020-07-20 17:59:12,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:59:12,815 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-07-20 17:59:12,815 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-20 17:59:12,816 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-07-20 17:59:12,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-07-20 17:59:12,817 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:59:12,817 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:59:13,031 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:13,032 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:59:13,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:59:13,033 INFO L82 PathProgramCache]: Analyzing trace with hash -810203330, now seen corresponding path program 4 times [2020-07-20 17:59:13,034 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:59:13,034 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [518882064] [2020-07-20 17:59:13,035 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:13,107 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:59:13,107 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:59:13,111 WARN L261 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 145 conjunts are in the unsatisfiable core [2020-07-20 17:59:13,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:59:13,948 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:59:13,949 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:59:14,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:59:15,821 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:59:15,822 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [518882064] [2020-07-20 17:59:15,822 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:59:15,822 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 54 [2020-07-20 17:59:15,823 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1952766724] [2020-07-20 17:59:15,823 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-07-20 17:59:15,824 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:59:15,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-07-20 17:59:15,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=642, Invalid=2220, Unknown=0, NotChecked=0, Total=2862 [2020-07-20 17:59:15,826 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 54 states. [2020-07-20 17:59:16,901 WARN L193 SmtUtils]: Spent 187.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2020-07-20 17:59:17,360 WARN L193 SmtUtils]: Spent 316.00 ms on a formula simplification. DAG size of input: 122 DAG size of output: 100 [2020-07-20 17:59:17,746 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2020-07-20 17:59:18,139 WARN L193 SmtUtils]: Spent 292.00 ms on a formula simplification. DAG size of input: 121 DAG size of output: 99 [2020-07-20 17:59:18,529 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2020-07-20 17:59:18,996 WARN L193 SmtUtils]: Spent 192.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2020-07-20 17:59:19,347 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2020-07-20 17:59:19,707 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2020-07-20 17:59:20,037 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2020-07-20 17:59:20,343 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2020-07-20 17:59:20,635 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-20 17:59:20,933 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-20 17:59:21,204 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-20 17:59:21,468 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 17:59:23,860 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2020-07-20 17:59:23,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:59:23,877 INFO L93 Difference]: Finished difference Result 68 states and 91 transitions. [2020-07-20 17:59:23,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-07-20 17:59:23,880 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 35 [2020-07-20 17:59:23,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:59:23,881 INFO L225 Difference]: With dead ends: 68 [2020-07-20 17:59:23,881 INFO L226 Difference]: Without dead ends: 60 [2020-07-20 17:59:23,884 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 528 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=1958, Invalid=4684, Unknown=0, NotChecked=0, Total=6642 [2020-07-20 17:59:23,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-20 17:59:23,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-07-20 17:59:23,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 17:59:23,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2020-07-20 17:59:23,907 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 35 [2020-07-20 17:59:23,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:59:23,907 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2020-07-20 17:59:23,908 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-07-20 17:59:23,908 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2020-07-20 17:59:23,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-07-20 17:59:23,912 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:59:23,912 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:59:24,116 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:24,118 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:59:24,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:59:24,118 INFO L82 PathProgramCache]: Analyzing trace with hash 404277694, now seen corresponding path program 5 times [2020-07-20 17:59:24,119 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:59:24,119 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1501459133] [2020-07-20 17:59:24,120 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:24,215 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:59:24,215 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:59:24,224 WARN L261 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 289 conjunts are in the unsatisfiable core [2020-07-20 17:59:24,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:59:27,008 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:59:27,009 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:59:27,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:59:34,174 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:59:34,175 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1501459133] [2020-07-20 17:59:34,175 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:59:34,175 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53] total 102 [2020-07-20 17:59:34,176 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532561240] [2020-07-20 17:59:34,176 INFO L459 AbstractCegarLoop]: Interpolant automaton has 102 states [2020-07-20 17:59:34,177 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:59:34,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 102 interpolants. [2020-07-20 17:59:34,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2418, Invalid=7884, Unknown=0, NotChecked=0, Total=10302 [2020-07-20 17:59:34,182 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 102 states. [2020-07-20 17:59:38,212 WARN L193 SmtUtils]: Spent 571.00 ms on a formula simplification that was a NOOP. DAG size: 244 [2020-07-20 17:59:39,423 WARN L193 SmtUtils]: Spent 881.00 ms on a formula simplification. DAG size of input: 242 DAG size of output: 196 [2020-07-20 17:59:40,940 WARN L193 SmtUtils]: Spent 546.00 ms on a formula simplification that was a NOOP. DAG size: 239 [2020-07-20 17:59:41,987 WARN L193 SmtUtils]: Spent 828.00 ms on a formula simplification. DAG size of input: 241 DAG size of output: 195 [2020-07-20 17:59:43,538 WARN L193 SmtUtils]: Spent 592.00 ms on a formula simplification that was a NOOP. DAG size: 234 [2020-07-20 17:59:45,188 WARN L193 SmtUtils]: Spent 539.00 ms on a formula simplification that was a NOOP. DAG size: 229 [2020-07-20 17:59:46,651 WARN L193 SmtUtils]: Spent 510.00 ms on a formula simplification that was a NOOP. DAG size: 224 [2020-07-20 17:59:48,089 WARN L193 SmtUtils]: Spent 515.00 ms on a formula simplification that was a NOOP. DAG size: 219 [2020-07-20 17:59:49,513 WARN L193 SmtUtils]: Spent 496.00 ms on a formula simplification that was a NOOP. DAG size: 214 [2020-07-20 17:59:50,901 WARN L193 SmtUtils]: Spent 476.00 ms on a formula simplification that was a NOOP. DAG size: 209 [2020-07-20 17:59:52,237 WARN L193 SmtUtils]: Spent 461.00 ms on a formula simplification that was a NOOP. DAG size: 204 [2020-07-20 17:59:53,565 WARN L193 SmtUtils]: Spent 459.00 ms on a formula simplification that was a NOOP. DAG size: 199 [2020-07-20 17:59:54,925 WARN L193 SmtUtils]: Spent 447.00 ms on a formula simplification that was a NOOP. DAG size: 194 [2020-07-20 17:59:56,227 WARN L193 SmtUtils]: Spent 415.00 ms on a formula simplification that was a NOOP. DAG size: 189 [2020-07-20 17:59:57,517 WARN L193 SmtUtils]: Spent 414.00 ms on a formula simplification that was a NOOP. DAG size: 184 [2020-07-20 17:59:58,760 WARN L193 SmtUtils]: Spent 394.00 ms on a formula simplification that was a NOOP. DAG size: 179 [2020-07-20 18:00:00,006 WARN L193 SmtUtils]: Spent 393.00 ms on a formula simplification that was a NOOP. DAG size: 174 [2020-07-20 18:00:01,235 WARN L193 SmtUtils]: Spent 378.00 ms on a formula simplification that was a NOOP. DAG size: 169 [2020-07-20 18:00:02,433 WARN L193 SmtUtils]: Spent 373.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2020-07-20 18:00:03,661 WARN L193 SmtUtils]: Spent 396.00 ms on a formula simplification that was a NOOP. DAG size: 159 [2020-07-20 18:00:04,811 WARN L193 SmtUtils]: Spent 340.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2020-07-20 18:00:05,953 WARN L193 SmtUtils]: Spent 323.00 ms on a formula simplification that was a NOOP. DAG size: 149 [2020-07-20 18:00:07,088 WARN L193 SmtUtils]: Spent 325.00 ms on a formula simplification that was a NOOP. DAG size: 144 [2020-07-20 18:00:08,174 WARN L193 SmtUtils]: Spent 306.00 ms on a formula simplification that was a NOOP. DAG size: 139 [2020-07-20 18:00:09,235 WARN L193 SmtUtils]: Spent 293.00 ms on a formula simplification that was a NOOP. DAG size: 134 [2020-07-20 18:00:10,262 WARN L193 SmtUtils]: Spent 280.00 ms on a formula simplification that was a NOOP. DAG size: 129 [2020-07-20 18:00:11,268 WARN L193 SmtUtils]: Spent 257.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2020-07-20 18:00:12,219 WARN L193 SmtUtils]: Spent 246.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2020-07-20 18:00:13,170 WARN L193 SmtUtils]: Spent 242.00 ms on a formula simplification that was a NOOP. DAG size: 114 [2020-07-20 18:00:14,073 WARN L193 SmtUtils]: Spent 221.00 ms on a formula simplification that was a NOOP. DAG size: 109 [2020-07-20 18:00:14,955 WARN L193 SmtUtils]: Spent 221.00 ms on a formula simplification that was a NOOP. DAG size: 104 [2020-07-20 18:00:15,818 WARN L193 SmtUtils]: Spent 214.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2020-07-20 18:00:16,658 WARN L193 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2020-07-20 18:00:17,430 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2020-07-20 18:00:18,193 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-20 18:00:18,923 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-20 18:00:19,640 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-20 18:00:20,437 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 18:00:21,110 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 18:00:21,746 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 18:00:27,763 WARN L193 SmtUtils]: Spent 751.00 ms on a formula simplification that was a NOOP. DAG size: 239 [2020-07-20 18:00:27,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:00:27,792 INFO L93 Difference]: Finished difference Result 116 states and 163 transitions. [2020-07-20 18:00:27,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2020-07-20 18:00:27,794 INFO L78 Accepts]: Start accepts. Automaton has 102 states. Word has length 59 [2020-07-20 18:00:27,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:00:27,796 INFO L225 Difference]: With dead ends: 116 [2020-07-20 18:00:27,796 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 18:00:27,803 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1644 ImplicationChecksByTransitivity, 59.5s TimeCoverageRelationStatistics Valid=7334, Invalid=16228, Unknown=0, NotChecked=0, Total=23562 [2020-07-20 18:00:27,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 18:00:27,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2020-07-20 18:00:27,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-20 18:00:27,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 108 transitions. [2020-07-20 18:00:27,845 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 108 transitions. Word has length 59 [2020-07-20 18:00:27,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:00:27,846 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 108 transitions. [2020-07-20 18:00:27,846 INFO L480 AbstractCegarLoop]: Interpolant automaton has 102 states. [2020-07-20 18:00:27,846 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 108 transitions. [2020-07-20 18:00:27,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2020-07-20 18:00:27,850 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:00:27,851 INFO L422 BasicCegarLoop]: trace histogram [94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:00:28,061 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:00:28,063 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:00:28,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:00:28,063 INFO L82 PathProgramCache]: Analyzing trace with hash 1109479102, now seen corresponding path program 6 times [2020-07-20 18:00:28,064 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:00:28,064 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1286886808] [2020-07-20 18:00:28,064 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:00:28,275 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 18:00:28,276 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:00:28,296 WARN L261 TraceCheckSpWp]: Trace formula consists of 698 conjuncts, 577 conjunts are in the unsatisfiable core [2020-07-20 18:00:28,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:00:42,312 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:00:42,312 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:00:42,870 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 18:01:30,850 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:01:30,851 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1286886808] [2020-07-20 18:01:30,851 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:01:30,851 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 101] total 198 [2020-07-20 18:01:30,851 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049515868] [2020-07-20 18:01:30,852 INFO L459 AbstractCegarLoop]: Interpolant automaton has 198 states [2020-07-20 18:01:30,853 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:01:30,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 198 interpolants. [2020-07-20 18:01:30,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9426, Invalid=29580, Unknown=0, NotChecked=0, Total=39006 [2020-07-20 18:01:30,862 INFO L87 Difference]: Start difference. First operand 108 states and 108 transitions. Second operand 198 states. [2020-07-20 18:02:09,307 WARN L193 SmtUtils]: Spent 3.61 s on a formula simplification that was a NOOP. DAG size: 484 [2020-07-20 18:02:14,983 WARN L193 SmtUtils]: Spent 4.42 s on a formula simplification. DAG size of input: 482 DAG size of output: 388 [2020-07-20 18:02:31,384 WARN L193 SmtUtils]: Spent 3.86 s on a formula simplification that was a NOOP. DAG size: 479 [2020-07-20 18:02:36,541 WARN L193 SmtUtils]: Spent 4.31 s on a formula simplification. DAG size of input: 481 DAG size of output: 387 [2020-07-20 18:02:54,486 WARN L193 SmtUtils]: Spent 3.85 s on a formula simplification that was a NOOP. DAG size: 474 [2020-07-20 18:03:13,241 WARN L193 SmtUtils]: Spent 3.98 s on a formula simplification that was a NOOP. DAG size: 469 [2020-07-20 18:03:33,846 WARN L193 SmtUtils]: Spent 4.24 s on a formula simplification that was a NOOP. DAG size: 464 [2020-07-20 18:03:54,259 WARN L193 SmtUtils]: Spent 4.14 s on a formula simplification that was a NOOP. DAG size: 459 [2020-07-20 18:04:15,087 WARN L193 SmtUtils]: Spent 3.96 s on a formula simplification that was a NOOP. DAG size: 454 [2020-07-20 18:04:36,943 WARN L193 SmtUtils]: Spent 4.18 s on a formula simplification that was a NOOP. DAG size: 449 [2020-07-20 18:05:00,926 WARN L193 SmtUtils]: Spent 4.55 s on a formula simplification that was a NOOP. DAG size: 444 [2020-07-20 18:05:26,665 WARN L193 SmtUtils]: Spent 4.54 s on a formula simplification that was a NOOP. DAG size: 439 [2020-07-20 18:05:51,811 WARN L193 SmtUtils]: Spent 4.51 s on a formula simplification that was a NOOP. DAG size: 434 [2020-07-20 18:06:16,364 WARN L193 SmtUtils]: Spent 4.21 s on a formula simplification that was a NOOP. DAG size: 429 [2020-07-20 18:06:41,792 WARN L193 SmtUtils]: Spent 4.40 s on a formula simplification that was a NOOP. DAG size: 424 [2020-07-20 18:07:06,295 WARN L193 SmtUtils]: Spent 4.48 s on a formula simplification that was a NOOP. DAG size: 419 [2020-07-20 18:07:31,973 WARN L193 SmtUtils]: Spent 4.78 s on a formula simplification that was a NOOP. DAG size: 414 [2020-07-20 18:07:57,748 WARN L193 SmtUtils]: Spent 4.50 s on a formula simplification that was a NOOP. DAG size: 409 [2020-07-20 18:08:23,861 WARN L193 SmtUtils]: Spent 3.46 s on a formula simplification that was a NOOP. DAG size: 404 [2020-07-20 18:08:41,423 WARN L193 SmtUtils]: Spent 3.09 s on a formula simplification that was a NOOP. DAG size: 399 [2020-07-20 18:08:58,575 WARN L193 SmtUtils]: Spent 3.03 s on a formula simplification that was a NOOP. DAG size: 394 [2020-07-20 18:09:16,745 WARN L193 SmtUtils]: Spent 3.20 s on a formula simplification that was a NOOP. DAG size: 389 [2020-07-20 18:09:34,354 WARN L193 SmtUtils]: Spent 3.19 s on a formula simplification that was a NOOP. DAG size: 384 [2020-07-20 18:09:52,415 WARN L193 SmtUtils]: Spent 3.20 s on a formula simplification that was a NOOP. DAG size: 379 [2020-07-20 18:10:11,703 WARN L193 SmtUtils]: Spent 3.38 s on a formula simplification that was a NOOP. DAG size: 374 [2020-07-20 18:10:31,026 WARN L193 SmtUtils]: Spent 3.43 s on a formula simplification that was a NOOP. DAG size: 369 [2020-07-20 18:10:50,789 WARN L193 SmtUtils]: Spent 3.28 s on a formula simplification that was a NOOP. DAG size: 364 [2020-07-20 18:11:10,602 WARN L193 SmtUtils]: Spent 3.40 s on a formula simplification that was a NOOP. DAG size: 359 [2020-07-20 18:11:31,619 WARN L193 SmtUtils]: Spent 3.36 s on a formula simplification that was a NOOP. DAG size: 354 [2020-07-20 18:11:52,939 WARN L193 SmtUtils]: Spent 3.41 s on a formula simplification that was a NOOP. DAG size: 349 [2020-07-20 18:12:14,802 WARN L193 SmtUtils]: Spent 3.60 s on a formula simplification that was a NOOP. DAG size: 344 [2020-07-20 18:12:36,740 WARN L193 SmtUtils]: Spent 3.49 s on a formula simplification that was a NOOP. DAG size: 339 [2020-07-20 18:12:58,056 WARN L193 SmtUtils]: Spent 3.45 s on a formula simplification that was a NOOP. DAG size: 334 [2020-07-20 18:13:20,000 WARN L193 SmtUtils]: Spent 3.41 s on a formula simplification that was a NOOP. DAG size: 329