/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/hhk2008.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 20:35:45,602 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 20:35:45,606 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 20:35:45,628 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 20:35:45,629 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 20:35:45,631 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 20:35:45,634 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 20:35:45,645 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 20:35:45,651 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 20:35:45,654 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 20:35:45,657 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 20:35:45,659 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 20:35:45,659 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 20:35:45,662 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 20:35:45,665 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 20:35:45,667 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 20:35:45,669 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 20:35:45,670 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 20:35:45,672 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 20:35:45,678 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 20:35:45,685 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 20:35:45,690 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 20:35:45,691 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 20:35:45,693 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 20:35:45,697 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 20:35:45,710 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 20:35:45,711 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 20:35:45,713 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 20:35:45,715 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 20:35:45,753 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 20:35:45,754 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 20:35:45,757 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 20:35:45,758 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 20:35:45,758 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 20:35:45,758 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 20:35:45,758 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 20:35:45,759 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 20:35:45,759 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 20:35:45,759 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 20:35:45,762 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 20:35:45,763 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 20:35:45,763 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 20:35:45,763 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 20:35:45,763 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 20:35:45,764 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 20:35:45,764 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 20:35:45,764 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 20:35:45,764 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 20:35:45,764 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 20:35:45,765 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 20:35:45,765 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 20:35:45,765 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 20:35:45,765 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 20:35:45,765 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 20:35:45,766 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 20:35:45,766 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:35:45,766 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 20:35:45,766 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 20:35:45,766 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 20:35:46,162 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 20:35:46,179 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 20:35:46,184 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 20:35:46,186 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 20:35:46,189 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 20:35:46,190 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/hhk2008.i [2020-07-21 20:35:46,266 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/907b78110/c323216199c141feb82357ac4a8b9cfc/FLAG3229390ff [2020-07-21 20:35:46,852 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 20:35:46,853 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/hhk2008.i [2020-07-21 20:35:46,865 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/907b78110/c323216199c141feb82357ac4a8b9cfc/FLAG3229390ff [2020-07-21 20:35:47,222 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/907b78110/c323216199c141feb82357ac4a8b9cfc [2020-07-21 20:35:47,234 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 20:35:47,239 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 20:35:47,241 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 20:35:47,241 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 20:35:47,245 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 20:35:47,247 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 08:35:47" (1/1) ... [2020-07-21 20:35:47,251 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7d76e0e0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:47, skipping insertion in model container [2020-07-21 20:35:47,252 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 08:35:47" (1/1) ... [2020-07-21 20:35:47,262 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 20:35:47,286 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 20:35:47,473 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 20:35:47,479 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 20:35:47,495 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 20:35:47,510 INFO L208 MainTranslator]: Completed translation [2020-07-21 20:35:47,511 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:47 WrapperNode [2020-07-21 20:35:47,511 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 20:35:47,512 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 20:35:47,512 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 20:35:47,512 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 20:35:47,524 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:47" (1/1) ... [2020-07-21 20:35:47,525 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:47" (1/1) ... [2020-07-21 20:35:47,530 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:47" (1/1) ... [2020-07-21 20:35:47,531 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:47" (1/1) ... [2020-07-21 20:35:47,535 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:47" (1/1) ... [2020-07-21 20:35:47,539 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:47" (1/1) ... [2020-07-21 20:35:47,540 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:47" (1/1) ... [2020-07-21 20:35:47,629 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 20:35:47,630 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 20:35:47,631 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 20:35:47,631 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 20:35:47,633 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:47" (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 20:35:47,693 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 20:35:47,693 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 20:35:47,693 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 20:35:47,693 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 20:35:47,693 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 20:35:47,694 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 20:35:47,694 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 20:35:47,694 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 20:35:47,694 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 20:35:47,694 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 20:35:47,694 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 20:35:47,695 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 20:35:47,695 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 20:35:47,892 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 20:35:47,892 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 20:35:47,897 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 08:35:47 BoogieIcfgContainer [2020-07-21 20:35:47,897 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 20:35:47,899 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 20:35:47,899 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 20:35:47,903 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 20:35:47,904 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 08:35:47" (1/3) ... [2020-07-21 20:35:47,905 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38d238f9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 08:35:47, skipping insertion in model container [2020-07-21 20:35:47,905 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:47" (2/3) ... [2020-07-21 20:35:47,906 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38d238f9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 08:35:47, skipping insertion in model container [2020-07-21 20:35:47,906 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 08:35:47" (3/3) ... [2020-07-21 20:35:47,909 INFO L109 eAbstractionObserver]: Analyzing ICFG hhk2008.i [2020-07-21 20:35:47,919 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 20:35:47,929 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 20:35:47,945 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 20:35:47,971 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 20:35:47,971 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 20:35:47,971 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 20:35:47,971 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 20:35:47,972 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 20:35:47,972 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 20:35:47,972 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 20:35:47,972 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 20:35:47,992 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 20:35:47,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-21 20:35:47,998 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:35:48,000 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:35:48,001 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:35:48,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:35:48,006 INFO L82 PathProgramCache]: Analyzing trace with hash -677001103, now seen corresponding path program 1 times [2020-07-21 20:35:48,014 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:35:48,015 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [703990444] [2020-07-21 20:35:48,016 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 20:35:48,102 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:35:48,102 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:35:48,108 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 20:35:48,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:35:48,293 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 20:35:48,349 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 20:35:48,350 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 20:35:48,352 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [703990444] [2020-07-21 20:35:48,353 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 20:35:48,353 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 20:35:48,354 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1335088623] [2020-07-21 20:35:48,361 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 20:35:48,361 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:35:48,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 20:35:48,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-21 20:35:48,378 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 6 states. [2020-07-21 20:35:48,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:35:48,559 INFO L93 Difference]: Finished difference Result 41 states and 50 transitions. [2020-07-21 20:35:48,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 20:35:48,562 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 12 [2020-07-21 20:35:48,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:35:48,573 INFO L225 Difference]: With dead ends: 41 [2020-07-21 20:35:48,573 INFO L226 Difference]: Without dead ends: 14 [2020-07-21 20:35:48,577 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-21 20:35:48,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-07-21 20:35:48,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-07-21 20:35:48,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-07-21 20:35:48,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-07-21 20:35:48,620 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-07-21 20:35:48,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:35:48,621 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-07-21 20:35:48,622 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 20:35:48,622 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-07-21 20:35:48,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 20:35:48,623 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:35:48,623 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:35:48,836 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:35:48,837 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:35:48,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:35:48,839 INFO L82 PathProgramCache]: Analyzing trace with hash 523340046, now seen corresponding path program 1 times [2020-07-21 20:35:48,839 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:35:48,840 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1345128533] [2020-07-21 20:35:48,840 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 20:35:48,888 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:35:48,889 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:35:48,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 20:35:48,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:35:48,953 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 20:35:48,995 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:35:48,996 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:35:49,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:35:49,115 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:35:49,115 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1345128533] [2020-07-21 20:35:49,116 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:35:49,116 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 20:35:49,116 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2142539428] [2020-07-21 20:35:49,118 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 20:35:49,118 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:35:49,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 20:35:49,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 20:35:49,119 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 10 states. [2020-07-21 20:35:49,296 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:35:49,297 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2020-07-21 20:35:49,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 20:35:49,297 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 13 [2020-07-21 20:35:49,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:35:49,298 INFO L225 Difference]: With dead ends: 22 [2020-07-21 20:35:49,299 INFO L226 Difference]: Without dead ends: 16 [2020-07-21 20:35:49,300 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2020-07-21 20:35:49,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-07-21 20:35:49,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-07-21 20:35:49,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-07-21 20:35:49,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-07-21 20:35:49,306 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2020-07-21 20:35:49,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:35:49,306 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-07-21 20:35:49,307 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 20:35:49,307 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-07-21 20:35:49,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-21 20:35:49,308 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:35:49,308 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:35:49,508 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:35:49,509 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:35:49,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:35:49,510 INFO L82 PathProgramCache]: Analyzing trace with hash 1555818862, now seen corresponding path program 2 times [2020-07-21 20:35:49,510 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:35:49,510 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1363289218] [2020-07-21 20:35:49,511 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 20:35:49,562 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:35:49,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:35:49,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 20:35:49,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:35:49,656 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 20:35:49,692 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:35:49,693 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:35:49,721 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:35:49,857 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:35:49,858 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1363289218] [2020-07-21 20:35:49,858 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:35:49,859 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2020-07-21 20:35:49,859 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294431956] [2020-07-21 20:35:49,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 20:35:49,860 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:35:49,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 20:35:49,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 20:35:49,861 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 14 states. [2020-07-21 20:35:50,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:35:50,375 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2020-07-21 20:35:50,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 20:35:50,375 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 15 [2020-07-21 20:35:50,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:35:50,376 INFO L225 Difference]: With dead ends: 26 [2020-07-21 20:35:50,377 INFO L226 Difference]: Without dead ends: 20 [2020-07-21 20:35:50,377 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=124, Invalid=428, Unknown=0, NotChecked=0, Total=552 [2020-07-21 20:35:50,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-07-21 20:35:50,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-07-21 20:35:50,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-07-21 20:35:50,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-07-21 20:35:50,384 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 15 [2020-07-21 20:35:50,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:35:50,385 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-07-21 20:35:50,385 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 20:35:50,385 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-07-21 20:35:50,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 20:35:50,386 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:35:50,386 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:35:50,587 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:35:50,587 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:35:50,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:35:50,588 INFO L82 PathProgramCache]: Analyzing trace with hash 399696430, now seen corresponding path program 3 times [2020-07-21 20:35:50,588 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:35:50,589 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [916040752] [2020-07-21 20:35:50,589 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 20:35:50,641 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:35:50,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:35:50,643 WARN L261 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-21 20:35:50,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:35:50,816 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 20:35:50,865 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:35:50,866 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:35:50,905 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:35:51,242 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:35:51,243 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [916040752] [2020-07-21 20:35:51,243 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:35:51,244 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2020-07-21 20:35:51,244 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1015936638] [2020-07-21 20:35:51,245 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 20:35:51,245 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:35:51,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 20:35:51,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2020-07-21 20:35:51,247 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 22 states. [2020-07-21 20:35:51,785 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 40 [2020-07-21 20:35:52,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:35:52,530 INFO L93 Difference]: Finished difference Result 34 states and 41 transitions. [2020-07-21 20:35:52,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-21 20:35:52,531 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 19 [2020-07-21 20:35:52,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:35:52,533 INFO L225 Difference]: With dead ends: 34 [2020-07-21 20:35:52,533 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 20:35:52,536 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=352, Invalid=1208, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 20:35:52,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 20:35:52,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-21 20:35:52,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 20:35:52,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-07-21 20:35:52,553 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 19 [2020-07-21 20:35:52,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:35:52,554 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-07-21 20:35:52,554 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 20:35:52,554 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-07-21 20:35:52,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 20:35:52,555 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:35:52,555 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:35:52,768 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:35:52,769 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:35:52,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:35:52,770 INFO L82 PathProgramCache]: Analyzing trace with hash -852380754, now seen corresponding path program 4 times [2020-07-21 20:35:52,771 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:35:52,772 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1796246044] [2020-07-21 20:35:52,772 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 20:35:52,826 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:35:52,827 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:35:52,830 WARN L261 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 68 conjunts are in the unsatisfiable core [2020-07-21 20:35:52,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:35:53,168 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 20:35:53,226 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:35:53,226 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:35:53,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:35:54,168 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:35:54,169 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1796246044] [2020-07-21 20:35:54,169 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:35:54,169 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 38 [2020-07-21 20:35:54,169 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894884849] [2020-07-21 20:35:54,170 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-21 20:35:54,170 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:35:54,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-21 20:35:54,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=1104, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 20:35:54,172 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 38 states. [2020-07-21 20:35:55,150 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2020-07-21 20:35:55,404 WARN L193 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 103 DAG size of output: 72 [2020-07-21 20:35:55,636 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2020-07-21 20:35:55,861 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 68 [2020-07-21 20:35:56,090 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-21 20:35:58,175 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-21 20:35:58,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:35:58,185 INFO L93 Difference]: Finished difference Result 50 states and 65 transitions. [2020-07-21 20:35:58,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 20:35:58,187 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 27 [2020-07-21 20:35:58,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:35:58,189 INFO L225 Difference]: With dead ends: 50 [2020-07-21 20:35:58,189 INFO L226 Difference]: Without dead ends: 44 [2020-07-21 20:35:58,193 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 632 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=1192, Invalid=3920, Unknown=0, NotChecked=0, Total=5112 [2020-07-21 20:35:58,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-07-21 20:35:58,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-07-21 20:35:58,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-21 20:35:58,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-07-21 20:35:58,214 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 27 [2020-07-21 20:35:58,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:35:58,214 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-07-21 20:35:58,215 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-21 20:35:58,215 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-07-21 20:35:58,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-21 20:35:58,216 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:35:58,216 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:35:58,425 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:35:58,429 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:35:58,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:35:58,429 INFO L82 PathProgramCache]: Analyzing trace with hash -2114791762, now seen corresponding path program 5 times [2020-07-21 20:35:58,430 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:35:58,430 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1909761011] [2020-07-21 20:35:58,430 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 20:35:58,478 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:35:58,478 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:35:58,482 WARN L261 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 132 conjunts are in the unsatisfiable core [2020-07-21 20:35:58,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:35:59,574 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 20:35:59,709 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:35:59,709 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:35:59,815 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:36:03,128 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:36:03,129 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1909761011] [2020-07-21 20:36:03,129 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:36:03,129 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37] total 70 [2020-07-21 20:36:03,129 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960055837] [2020-07-21 20:36:03,130 INFO L459 AbstractCegarLoop]: Interpolant automaton has 70 states [2020-07-21 20:36:03,130 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:36:03,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2020-07-21 20:36:03,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1102, Invalid=3728, Unknown=0, NotChecked=0, Total=4830 [2020-07-21 20:36:03,134 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 70 states. [2020-07-21 20:36:06,176 WARN L193 SmtUtils]: Spent 318.00 ms on a formula simplification that was a NOOP. DAG size: 198 [2020-07-21 20:36:06,822 WARN L193 SmtUtils]: Spent 489.00 ms on a formula simplification. DAG size of input: 199 DAG size of output: 136 [2020-07-21 20:36:07,525 WARN L193 SmtUtils]: Spent 321.00 ms on a formula simplification that was a NOOP. DAG size: 190 [2020-07-21 20:36:08,118 WARN L193 SmtUtils]: Spent 464.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 132 [2020-07-21 20:36:08,863 WARN L193 SmtUtils]: Spent 326.00 ms on a formula simplification that was a NOOP. DAG size: 184 [2020-07-21 20:36:09,605 WARN L193 SmtUtils]: Spent 281.00 ms on a formula simplification that was a NOOP. DAG size: 178 [2020-07-21 20:36:10,217 WARN L193 SmtUtils]: Spent 278.00 ms on a formula simplification that was a NOOP. DAG size: 172 [2020-07-21 20:36:10,807 WARN L193 SmtUtils]: Spent 256.00 ms on a formula simplification that was a NOOP. DAG size: 166 [2020-07-21 20:36:11,415 WARN L193 SmtUtils]: Spent 267.00 ms on a formula simplification that was a NOOP. DAG size: 160 [2020-07-21 20:36:12,225 WARN L193 SmtUtils]: Spent 299.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2020-07-21 20:36:12,827 WARN L193 SmtUtils]: Spent 240.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2020-07-21 20:36:13,396 WARN L193 SmtUtils]: Spent 228.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-07-21 20:36:14,053 WARN L193 SmtUtils]: Spent 228.00 ms on a formula simplification that was a NOOP. DAG size: 136 [2020-07-21 20:36:14,591 WARN L193 SmtUtils]: Spent 208.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2020-07-21 20:36:15,105 WARN L193 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2020-07-21 20:36:15,615 WARN L193 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2020-07-21 20:36:16,095 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-21 20:36:16,572 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2020-07-21 20:36:17,029 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2020-07-21 20:36:17,478 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2020-07-21 20:36:17,893 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-21 20:36:18,282 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-21 20:36:18,662 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2020-07-21 20:36:22,273 WARN L193 SmtUtils]: Spent 301.00 ms on a formula simplification that was a NOOP. DAG size: 193 [2020-07-21 20:36:22,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:36:22,287 INFO L93 Difference]: Finished difference Result 82 states and 113 transitions. [2020-07-21 20:36:22,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2020-07-21 20:36:22,288 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 43 [2020-07-21 20:36:22,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:36:22,290 INFO L225 Difference]: With dead ends: 82 [2020-07-21 20:36:22,291 INFO L226 Difference]: Without dead ends: 76 [2020-07-21 20:36:22,296 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2296 ImplicationChecksByTransitivity, 21.7s TimeCoverageRelationStatistics Valid=4408, Invalid=13952, Unknown=0, NotChecked=0, Total=18360 [2020-07-21 20:36:22,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-21 20:36:22,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2020-07-21 20:36:22,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 20:36:22,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 76 transitions. [2020-07-21 20:36:22,329 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 76 transitions. Word has length 43 [2020-07-21 20:36:22,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:36:22,332 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 76 transitions. [2020-07-21 20:36:22,333 INFO L480 AbstractCegarLoop]: Interpolant automaton has 70 states. [2020-07-21 20:36:22,333 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 76 transitions. [2020-07-21 20:36:22,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-07-21 20:36:22,337 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:36:22,338 INFO L422 BasicCegarLoop]: trace histogram [63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:36:22,554 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:36:22,555 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:36:22,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:36:22,556 INFO L82 PathProgramCache]: Analyzing trace with hash -1115480914, now seen corresponding path program 6 times [2020-07-21 20:36:22,557 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:36:22,557 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [556829414] [2020-07-21 20:36:22,558 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 20:36:22,643 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:36:22,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:36:22,654 WARN L261 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 260 conjunts are in the unsatisfiable core [2020-07-21 20:36:22,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:36:26,989 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 20:36:27,254 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:36:27,255 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:36:27,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:36:43,614 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:36:43,616 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [556829414] [2020-07-21 20:36:43,616 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:36:43,616 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69] total 134 [2020-07-21 20:36:43,617 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607074041] [2020-07-21 20:36:43,626 INFO L459 AbstractCegarLoop]: Interpolant automaton has 134 states [2020-07-21 20:36:43,626 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:36:43,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2020-07-21 20:36:43,634 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4238, Invalid=13584, Unknown=0, NotChecked=0, Total=17822 [2020-07-21 20:36:43,635 INFO L87 Difference]: Start difference. First operand 76 states and 76 transitions. Second operand 134 states. [2020-07-21 20:36:58,020 WARN L193 SmtUtils]: Spent 1.23 s on a formula simplification that was a NOOP. DAG size: 390 [2020-07-21 20:37:00,157 WARN L193 SmtUtils]: Spent 1.61 s on a formula simplification. DAG size of input: 391 DAG size of output: 264 [2020-07-21 20:37:03,665 WARN L193 SmtUtils]: Spent 1.46 s on a formula simplification that was a NOOP. DAG size: 382 [2020-07-21 20:37:05,680 WARN L193 SmtUtils]: Spent 1.63 s on a formula simplification. DAG size of input: 386 DAG size of output: 260 [2020-07-21 20:37:09,140 WARN L193 SmtUtils]: Spent 1.48 s on a formula simplification that was a NOOP. DAG size: 376 [2020-07-21 20:37:12,844 WARN L193 SmtUtils]: Spent 1.39 s on a formula simplification that was a NOOP. DAG size: 370 [2020-07-21 20:37:16,303 WARN L193 SmtUtils]: Spent 1.48 s on a formula simplification that was a NOOP. DAG size: 364 [2020-07-21 20:37:19,862 WARN L193 SmtUtils]: Spent 1.45 s on a formula simplification that was a NOOP. DAG size: 358 [2020-07-21 20:37:23,457 WARN L193 SmtUtils]: Spent 1.43 s on a formula simplification that was a NOOP. DAG size: 352 [2020-07-21 20:37:26,924 WARN L193 SmtUtils]: Spent 1.26 s on a formula simplification that was a NOOP. DAG size: 346 [2020-07-21 20:37:30,497 WARN L193 SmtUtils]: Spent 1.36 s on a formula simplification that was a NOOP. DAG size: 340 [2020-07-21 20:37:34,071 WARN L193 SmtUtils]: Spent 1.36 s on a formula simplification that was a NOOP. DAG size: 334 [2020-07-21 20:37:37,642 WARN L193 SmtUtils]: Spent 1.33 s on a formula simplification that was a NOOP. DAG size: 328 [2020-07-21 20:37:41,172 WARN L193 SmtUtils]: Spent 1.21 s on a formula simplification that was a NOOP. DAG size: 322 [2020-07-21 20:37:44,649 WARN L193 SmtUtils]: Spent 1.37 s on a formula simplification that was a NOOP. DAG size: 316 [2020-07-21 20:37:48,435 WARN L193 SmtUtils]: Spent 1.33 s on a formula simplification that was a NOOP. DAG size: 310 [2020-07-21 20:37:52,223 WARN L193 SmtUtils]: Spent 1.32 s on a formula simplification that was a NOOP. DAG size: 304 [2020-07-21 20:37:55,954 WARN L193 SmtUtils]: Spent 1.28 s on a formula simplification that was a NOOP. DAG size: 298 [2020-07-21 20:37:59,521 WARN L193 SmtUtils]: Spent 1.28 s on a formula simplification that was a NOOP. DAG size: 292 [2020-07-21 20:38:03,390 WARN L193 SmtUtils]: Spent 1.31 s on a formula simplification that was a NOOP. DAG size: 286 [2020-07-21 20:38:07,211 WARN L193 SmtUtils]: Spent 1.25 s on a formula simplification that was a NOOP. DAG size: 280 [2020-07-21 20:38:11,086 WARN L193 SmtUtils]: Spent 1.29 s on a formula simplification that was a NOOP. DAG size: 274 [2020-07-21 20:38:14,753 WARN L193 SmtUtils]: Spent 1.26 s on a formula simplification that was a NOOP. DAG size: 268 [2020-07-21 20:38:18,647 WARN L193 SmtUtils]: Spent 1.23 s on a formula simplification that was a NOOP. DAG size: 262 [2020-07-21 20:38:22,566 WARN L193 SmtUtils]: Spent 1.17 s on a formula simplification that was a NOOP. DAG size: 256 [2020-07-21 20:38:26,428 WARN L193 SmtUtils]: Spent 1.13 s on a formula simplification that was a NOOP. DAG size: 250 [2020-07-21 20:38:30,347 WARN L193 SmtUtils]: Spent 1.20 s on a formula simplification that was a NOOP. DAG size: 244 [2020-07-21 20:38:33,645 WARN L193 SmtUtils]: Spent 940.00 ms on a formula simplification that was a NOOP. DAG size: 238 [2020-07-21 20:38:37,740 WARN L193 SmtUtils]: Spent 1.14 s on a formula simplification that was a NOOP. DAG size: 232 [2020-07-21 20:38:41,906 WARN L193 SmtUtils]: Spent 1.17 s on a formula simplification that was a NOOP. DAG size: 226 [2020-07-21 20:38:45,938 WARN L193 SmtUtils]: Spent 1.11 s on a formula simplification that was a NOOP. DAG size: 220 [2020-07-21 20:38:49,980 WARN L193 SmtUtils]: Spent 1.10 s on a formula simplification that was a NOOP. DAG size: 214 [2020-07-21 20:38:53,512 WARN L193 SmtUtils]: Spent 1.08 s on a formula simplification that was a NOOP. DAG size: 208 [2020-07-21 20:38:57,624 WARN L193 SmtUtils]: Spent 1.07 s on a formula simplification that was a NOOP. DAG size: 202 [2020-07-21 20:39:01,733 WARN L193 SmtUtils]: Spent 1.08 s on a formula simplification that was a NOOP. DAG size: 196 [2020-07-21 20:39:05,867 WARN L193 SmtUtils]: Spent 1.08 s on a formula simplification that was a NOOP. DAG size: 190 [2020-07-21 20:39:09,852 WARN L193 SmtUtils]: Spent 996.00 ms on a formula simplification that was a NOOP. DAG size: 184 [2020-07-21 20:39:13,570 WARN L193 SmtUtils]: Spent 632.00 ms on a formula simplification that was a NOOP. DAG size: 178 [2020-07-21 20:39:17,412 WARN L193 SmtUtils]: Spent 947.00 ms on a formula simplification that was a NOOP. DAG size: 172 [2020-07-21 20:39:21,191 WARN L193 SmtUtils]: Spent 905.00 ms on a formula simplification that was a NOOP. DAG size: 166 [2020-07-21 20:39:24,964 WARN L193 SmtUtils]: Spent 873.00 ms on a formula simplification that was a NOOP. DAG size: 160 [2020-07-21 20:39:28,653 WARN L193 SmtUtils]: Spent 855.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2020-07-21 20:39:32,305 WARN L193 SmtUtils]: Spent 807.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2020-07-21 20:39:35,645 WARN L193 SmtUtils]: Spent 725.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-07-21 20:39:39,138 WARN L193 SmtUtils]: Spent 766.00 ms on a formula simplification that was a NOOP. DAG size: 136 [2020-07-21 20:39:42,523 WARN L193 SmtUtils]: Spent 715.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2020-07-21 20:39:45,857 WARN L193 SmtUtils]: Spent 706.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2020-07-21 20:39:49,141 WARN L193 SmtUtils]: Spent 653.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2020-07-21 20:39:52,271 WARN L193 SmtUtils]: Spent 610.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-21 20:39:55,277 WARN L193 SmtUtils]: Spent 573.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2020-07-21 20:39:57,819 WARN L193 SmtUtils]: Spent 424.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2020-07-21 20:40:00,189 WARN L193 SmtUtils]: Spent 466.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2020-07-21 20:40:03,043 WARN L193 SmtUtils]: Spent 555.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-21 20:40:05,724 WARN L193 SmtUtils]: Spent 449.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-21 20:40:08,103 WARN L193 SmtUtils]: Spent 381.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2020-07-21 20:40:10,347 WARN L193 SmtUtils]: Spent 359.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-21 20:40:12,596 WARN L193 SmtUtils]: Spent 378.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 20:40:14,657 WARN L193 SmtUtils]: Spent 295.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 20:40:16,665 WARN L193 SmtUtils]: Spent 273.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-21 20:40:18,512 WARN L193 SmtUtils]: Spent 249.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 20:40:20,231 WARN L193 SmtUtils]: Spent 221.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 20:40:21,771 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 20:40:36,780 WARN L193 SmtUtils]: Spent 3.12 s on a formula simplification that was a NOOP. DAG size: 385 [2020-07-21 20:40:36,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:40:36,814 INFO L93 Difference]: Finished difference Result 146 states and 209 transitions. [2020-07-21 20:40:36,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 134 states. [2020-07-21 20:40:36,819 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 75 [2020-07-21 20:40:36,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:40:36,822 INFO L225 Difference]: With dead ends: 146 [2020-07-21 20:40:36,823 INFO L226 Difference]: Without dead ends: 140 [2020-07-21 20:40:36,834 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 262 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8696 ImplicationChecksByTransitivity, 243.0s TimeCoverageRelationStatistics Valid=16984, Invalid=52448, Unknown=0, NotChecked=0, Total=69432 [2020-07-21 20:40:36,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2020-07-21 20:40:36,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 140. [2020-07-21 20:40:36,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-07-21 20:40:36,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 140 transitions. [2020-07-21 20:40:36,907 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 140 transitions. Word has length 75 [2020-07-21 20:40:36,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:40:36,908 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 140 transitions. [2020-07-21 20:40:36,908 INFO L480 AbstractCegarLoop]: Interpolant automaton has 134 states. [2020-07-21 20:40:36,908 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 140 transitions. [2020-07-21 20:40:36,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2020-07-21 20:40:36,911 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:40:36,911 INFO L422 BasicCegarLoop]: trace histogram [127, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:40:37,112 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:40:37,113 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:40:37,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:40:37,114 INFO L82 PathProgramCache]: Analyzing trace with hash -858019666, now seen corresponding path program 7 times [2020-07-21 20:40:37,114 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:40:37,115 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1163091620] [2020-07-21 20:40:37,115 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 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 20:40:37,293 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:40:37,294 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:40:37,310 WARN L261 TraceCheckSpWp]: Trace formula consists of 670 conjuncts, 516 conjunts are in the unsatisfiable core [2020-07-21 20:40:37,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:41:22,231 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 20:41:23,968 INFO L134 CoverageAnalysis]: Checked inductivity of 8128 backedges. 0 proven. 8128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:41:23,968 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:41:25,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:44:21,546 INFO L134 CoverageAnalysis]: Checked inductivity of 8128 backedges. 0 proven. 8128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:44:21,547 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1163091620] [2020-07-21 20:44:21,547 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:44:21,547 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [133, 133] total 262 [2020-07-21 20:44:21,548 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256684919] [2020-07-21 20:44:21,549 INFO L459 AbstractCegarLoop]: Interpolant automaton has 262 states [2020-07-21 20:44:21,549 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:44:21,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 262 interpolants. [2020-07-21 20:44:21,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16654, Invalid=51728, Unknown=0, NotChecked=0, Total=68382 [2020-07-21 20:44:21,560 INFO L87 Difference]: Start difference. First operand 140 states and 140 transitions. Second operand 262 states. [2020-07-21 20:47:48,723 WARN L193 SmtUtils]: Spent 10.33 s on a formula simplification that was a NOOP. DAG size: 774 [2020-07-21 20:48:04,997 WARN L193 SmtUtils]: Spent 13.37 s on a formula simplification. DAG size of input: 775 DAG size of output: 520 [2020-07-21 20:49:27,742 WARN L193 SmtUtils]: Spent 14.00 s on a formula simplification that was a NOOP. DAG size: 766 [2020-07-21 20:49:43,798 WARN L193 SmtUtils]: Spent 14.17 s on a formula simplification. DAG size of input: 770 DAG size of output: 516