/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/hhk2008.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 23:24:18,989 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 23:24:18,992 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 23:24:19,009 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 23:24:19,010 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 23:24:19,012 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 23:24:19,014 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 23:24:19,025 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 23:24:19,027 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 23:24:19,028 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 23:24:19,029 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 23:24:19,031 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 23:24:19,031 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 23:24:19,036 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 23:24:19,037 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 23:24:19,038 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 23:24:19,042 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 23:24:19,044 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 23:24:19,047 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 23:24:19,053 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 23:24:19,056 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 23:24:19,057 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 23:24:19,058 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 23:24:19,059 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 23:24:19,062 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 23:24:19,075 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 23:24:19,076 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 23:24:19,077 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 23:24:19,078 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 23:24:19,109 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 23:24:19,109 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 23:24:19,112 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 23:24:19,112 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 23:24:19,112 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 23:24:19,113 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 23:24:19,113 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 23:24:19,113 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 23:24:19,113 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 23:24:19,113 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 23:24:19,114 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 23:24:19,115 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 23:24:19,115 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 23:24:19,115 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 23:24:19,115 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 23:24:19,116 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 23:24:19,116 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 23:24:19,116 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 23:24:19,116 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 23:24:19,116 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 23:24:19,117 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 23:24:19,117 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 23:24:19,117 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 23:24:19,117 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 23:24:19,117 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 23:24:19,118 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 23:24:19,118 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:24:19,118 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 23:24:19,118 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 23:24:19,118 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-21 23:24:19,436 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 23:24:19,449 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 23:24:19,452 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 23:24:19,454 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 23:24:19,454 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 23:24:19,455 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/hhk2008.i [2020-07-21 23:24:19,528 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6e1565039/119016915d964fff84e69244934e60ec/FLAG99563b032 [2020-07-21 23:24:19,969 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 23:24:19,970 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/hhk2008.i [2020-07-21 23:24:19,980 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6e1565039/119016915d964fff84e69244934e60ec/FLAG99563b032 [2020-07-21 23:24:20,327 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6e1565039/119016915d964fff84e69244934e60ec [2020-07-21 23:24:20,337 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 23:24:20,340 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 23:24:20,342 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 23:24:20,343 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 23:24:20,346 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 23:24:20,347 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:24:20" (1/1) ... [2020-07-21 23:24:20,350 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4f9c8426 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:24:20, skipping insertion in model container [2020-07-21 23:24:20,350 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:24:20" (1/1) ... [2020-07-21 23:24:20,358 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 23:24:20,379 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 23:24:20,536 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:24:20,544 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 23:24:20,566 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:24:20,583 INFO L208 MainTranslator]: Completed translation [2020-07-21 23:24:20,584 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:24:20 WrapperNode [2020-07-21 23:24:20,584 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 23:24:20,585 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 23:24:20,585 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 23:24:20,586 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 23:24:20,599 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:24:20" (1/1) ... [2020-07-21 23:24:20,601 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:24:20" (1/1) ... [2020-07-21 23:24:20,605 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:24:20" (1/1) ... [2020-07-21 23:24:20,606 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:24:20" (1/1) ... [2020-07-21 23:24:20,609 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:24:20" (1/1) ... [2020-07-21 23:24:20,614 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:24:20" (1/1) ... [2020-07-21 23:24:20,615 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:24:20" (1/1) ... [2020-07-21 23:24:20,617 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 23:24:20,618 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 23:24:20,618 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 23:24:20,618 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 23:24:20,619 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:24:20" (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 23:24:20,775 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 23:24:20,775 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 23:24:20,775 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 23:24:20,776 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 23:24:20,776 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 23:24:20,776 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 23:24:20,776 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 23:24:20,776 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 23:24:20,776 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 23:24:20,777 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 23:24:20,777 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 23:24:20,777 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 23:24:20,777 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 23:24:20,961 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 23:24:20,961 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 23:24:20,965 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:24:20 BoogieIcfgContainer [2020-07-21 23:24:20,966 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 23:24:20,967 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 23:24:20,967 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 23:24:20,971 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 23:24:20,971 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:24:20" (1/3) ... [2020-07-21 23:24:20,972 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54b158ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:24:20, skipping insertion in model container [2020-07-21 23:24:20,972 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:24:20" (2/3) ... [2020-07-21 23:24:20,973 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54b158ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:24:20, skipping insertion in model container [2020-07-21 23:24:20,973 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:24:20" (3/3) ... [2020-07-21 23:24:20,975 INFO L109 eAbstractionObserver]: Analyzing ICFG hhk2008.i [2020-07-21 23:24:20,989 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 23:24:21,000 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 23:24:21,015 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 23:24:21,040 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 23:24:21,040 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 23:24:21,040 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 23:24:21,040 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 23:24:21,041 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 23:24:21,041 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 23:24:21,041 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 23:24:21,041 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 23:24:21,060 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 23:24:21,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-21 23:24:21,066 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:24:21,067 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:24:21,068 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:24:21,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:24:21,074 INFO L82 PathProgramCache]: Analyzing trace with hash -677001103, now seen corresponding path program 1 times [2020-07-21 23:24:21,083 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:24:21,084 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1858670048] [2020-07-21 23:24:21,084 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:24:21,155 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:24:21,156 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:24:21,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 23:24:21,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:24:21,277 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 23:24:21,328 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 23:24:21,328 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:24:21,329 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1858670048] [2020-07-21 23:24:21,330 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:24:21,330 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 23:24:21,332 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [923102796] [2020-07-21 23:24:21,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 23:24:21,337 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:24:21,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 23:24:21,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-21 23:24:21,351 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 6 states. [2020-07-21 23:24:21,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:24:21,497 INFO L93 Difference]: Finished difference Result 41 states and 50 transitions. [2020-07-21 23:24:21,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 23:24:21,499 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 12 [2020-07-21 23:24:21,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:24:21,509 INFO L225 Difference]: With dead ends: 41 [2020-07-21 23:24:21,509 INFO L226 Difference]: Without dead ends: 14 [2020-07-21 23:24:21,513 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-21 23:24:21,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-07-21 23:24:21,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-07-21 23:24:21,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-07-21 23:24:21,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-07-21 23:24:21,554 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-07-21 23:24:21,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:24:21,555 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-07-21 23:24:21,555 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 23:24:21,555 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-07-21 23:24:21,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 23:24:21,556 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:24:21,557 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:24:21,769 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:24:21,770 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:24:21,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:24:21,771 INFO L82 PathProgramCache]: Analyzing trace with hash 523340046, now seen corresponding path program 1 times [2020-07-21 23:24:21,772 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:24:21,772 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [196185731] [2020-07-21 23:24:21,773 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:24:21,812 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 23:24:21,813 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:24:21,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 23:24:21,820 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:24:21,886 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 23:24:21,917 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 23:24:21,917 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:24:21,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:24:22,005 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 23:24:22,006 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [196185731] [2020-07-21 23:24:22,006 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:24:22,006 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 23:24:22,007 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1490180457] [2020-07-21 23:24:22,008 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 23:24:22,009 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:24:22,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 23:24:22,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 23:24:22,010 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 10 states. [2020-07-21 23:24:22,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:24:22,223 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2020-07-21 23:24:22,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 23:24:22,223 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 13 [2020-07-21 23:24:22,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:24:22,224 INFO L225 Difference]: With dead ends: 22 [2020-07-21 23:24:22,225 INFO L226 Difference]: Without dead ends: 16 [2020-07-21 23:24:22,226 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 23:24:22,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-07-21 23:24:22,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-07-21 23:24:22,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-07-21 23:24:22,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-07-21 23:24:22,232 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2020-07-21 23:24:22,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:24:22,233 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-07-21 23:24:22,233 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 23:24:22,233 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-07-21 23:24:22,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-21 23:24:22,234 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:24:22,234 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:24:22,435 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:24:22,436 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:24:22,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:24:22,436 INFO L82 PathProgramCache]: Analyzing trace with hash 1555818862, now seen corresponding path program 2 times [2020-07-21 23:24:22,437 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:24:22,437 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [56078071] [2020-07-21 23:24:22,437 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:24:22,485 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:24:22,485 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:24:22,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 23:24:22,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:24:22,561 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 23:24:22,588 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 23:24:22,589 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:24:22,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:24:22,727 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 23:24:22,727 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [56078071] [2020-07-21 23:24:22,728 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:24:22,728 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2020-07-21 23:24:22,728 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896015399] [2020-07-21 23:24:22,729 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 23:24:22,729 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:24:22,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 23:24:22,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 23:24:22,730 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 14 states. [2020-07-21 23:24:23,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:24:23,136 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2020-07-21 23:24:23,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 23:24:23,137 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 15 [2020-07-21 23:24:23,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:24:23,138 INFO L225 Difference]: With dead ends: 26 [2020-07-21 23:24:23,138 INFO L226 Difference]: Without dead ends: 20 [2020-07-21 23:24:23,139 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=124, Invalid=428, Unknown=0, NotChecked=0, Total=552 [2020-07-21 23:24:23,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-07-21 23:24:23,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-07-21 23:24:23,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-07-21 23:24:23,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-07-21 23:24:23,145 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 15 [2020-07-21 23:24:23,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:24:23,146 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-07-21 23:24:23,146 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 23:24:23,146 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-07-21 23:24:23,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 23:24:23,147 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:24:23,147 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:24:23,348 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:24:23,349 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:24:23,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:24:23,350 INFO L82 PathProgramCache]: Analyzing trace with hash 399696430, now seen corresponding path program 3 times [2020-07-21 23:24:23,351 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:24:23,351 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [811719437] [2020-07-21 23:24:23,352 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:24:23,389 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:24:23,390 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:24:23,392 WARN L261 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-21 23:24:23,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:24:23,576 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 23:24:23,615 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 23:24:23,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:24:23,651 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:24:23,944 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 23:24:23,945 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [811719437] [2020-07-21 23:24:23,945 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:24:23,945 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2020-07-21 23:24:23,946 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [684065194] [2020-07-21 23:24:23,946 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 23:24:23,946 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:24:23,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 23:24:23,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2020-07-21 23:24:23,948 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 22 states. [2020-07-21 23:24:25,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:24:25,124 INFO L93 Difference]: Finished difference Result 34 states and 41 transitions. [2020-07-21 23:24:25,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-21 23:24:25,125 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 19 [2020-07-21 23:24:25,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:24:25,126 INFO L225 Difference]: With dead ends: 34 [2020-07-21 23:24:25,126 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 23:24:25,128 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=352, Invalid=1208, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 23:24:25,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 23:24:25,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-21 23:24:25,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 23:24:25,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-07-21 23:24:25,142 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 19 [2020-07-21 23:24:25,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:24:25,142 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-07-21 23:24:25,142 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 23:24:25,142 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-07-21 23:24:25,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 23:24:25,144 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:24:25,144 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:24:25,359 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:24:25,359 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:24:25,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:24:25,360 INFO L82 PathProgramCache]: Analyzing trace with hash -852380754, now seen corresponding path program 4 times [2020-07-21 23:24:25,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:24:25,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1518536418] [2020-07-21 23:24:25,362 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:24:25,400 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:24:25,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:24:25,402 WARN L261 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 68 conjunts are in the unsatisfiable core [2020-07-21 23:24:25,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:24:25,733 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 23:24:25,798 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 23:24:25,799 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:24:25,856 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:24:26,734 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 23:24:26,735 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1518536418] [2020-07-21 23:24:26,735 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:24:26,735 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 38 [2020-07-21 23:24:26,736 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426609945] [2020-07-21 23:24:26,736 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-21 23:24:26,736 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:24:26,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-21 23:24:26,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=1104, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 23:24:26,738 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 38 states. [2020-07-21 23:24:27,668 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2020-07-21 23:24:27,915 WARN L193 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 103 DAG size of output: 72 [2020-07-21 23:24:28,123 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2020-07-21 23:24:28,346 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 68 [2020-07-21 23:24:28,541 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-21 23:24:30,538 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-21 23:24:30,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:24:30,546 INFO L93 Difference]: Finished difference Result 50 states and 65 transitions. [2020-07-21 23:24:30,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 23:24:30,547 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 27 [2020-07-21 23:24:30,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:24:30,549 INFO L225 Difference]: With dead ends: 50 [2020-07-21 23:24:30,549 INFO L226 Difference]: Without dead ends: 44 [2020-07-21 23:24:30,552 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 632 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=1192, Invalid=3920, Unknown=0, NotChecked=0, Total=5112 [2020-07-21 23:24:30,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-07-21 23:24:30,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-07-21 23:24:30,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-21 23:24:30,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-07-21 23:24:30,564 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 27 [2020-07-21 23:24:30,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:24:30,565 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-07-21 23:24:30,565 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-21 23:24:30,565 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-07-21 23:24:30,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-21 23:24:30,566 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:24:30,566 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:24:30,767 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:24:30,768 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:24:30,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:24:30,769 INFO L82 PathProgramCache]: Analyzing trace with hash -2114791762, now seen corresponding path program 5 times [2020-07-21 23:24:30,769 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:24:30,770 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1523957869] [2020-07-21 23:24:30,770 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 23:24:30,826 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:24:30,827 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:24:30,830 WARN L261 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 132 conjunts are in the unsatisfiable core [2020-07-21 23:24:30,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:24:31,867 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 23:24:31,975 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 23:24:31,976 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:24:32,078 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:24:35,150 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 23:24:35,151 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1523957869] [2020-07-21 23:24:35,151 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:24:35,151 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37] total 70 [2020-07-21 23:24:35,152 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493331293] [2020-07-21 23:24:35,152 INFO L459 AbstractCegarLoop]: Interpolant automaton has 70 states [2020-07-21 23:24:35,152 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:24:35,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2020-07-21 23:24:35,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1102, Invalid=3728, Unknown=0, NotChecked=0, Total=4830 [2020-07-21 23:24:35,155 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 70 states. [2020-07-21 23:24:37,929 WARN L193 SmtUtils]: Spent 308.00 ms on a formula simplification that was a NOOP. DAG size: 198 [2020-07-21 23:24:38,543 WARN L193 SmtUtils]: Spent 473.00 ms on a formula simplification. DAG size of input: 199 DAG size of output: 136 [2020-07-21 23:24:39,164 WARN L193 SmtUtils]: Spent 284.00 ms on a formula simplification that was a NOOP. DAG size: 190 [2020-07-21 23:24:39,728 WARN L193 SmtUtils]: Spent 452.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 132 [2020-07-21 23:24:40,350 WARN L193 SmtUtils]: Spent 299.00 ms on a formula simplification that was a NOOP. DAG size: 184 [2020-07-21 23:24:41,007 WARN L193 SmtUtils]: Spent 272.00 ms on a formula simplification that was a NOOP. DAG size: 178 [2020-07-21 23:24:41,581 WARN L193 SmtUtils]: Spent 261.00 ms on a formula simplification that was a NOOP. DAG size: 172 [2020-07-21 23:24:42,150 WARN L193 SmtUtils]: Spent 264.00 ms on a formula simplification that was a NOOP. DAG size: 166 [2020-07-21 23:24:42,696 WARN L193 SmtUtils]: Spent 238.00 ms on a formula simplification that was a NOOP. DAG size: 160 [2020-07-21 23:24:43,210 WARN L193 SmtUtils]: Spent 222.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2020-07-21 23:24:43,716 WARN L193 SmtUtils]: Spent 211.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2020-07-21 23:24:44,198 WARN L193 SmtUtils]: Spent 202.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-07-21 23:24:44,788 WARN L193 SmtUtils]: Spent 214.00 ms on a formula simplification that was a NOOP. DAG size: 136 [2020-07-21 23:24:45,291 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2020-07-21 23:24:45,740 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2020-07-21 23:24:46,179 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2020-07-21 23:24:46,605 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-21 23:24:47,047 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2020-07-21 23:24:47,442 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2020-07-21 23:24:47,848 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2020-07-21 23:24:48,201 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-21 23:24:52,172 WARN L193 SmtUtils]: Spent 306.00 ms on a formula simplification that was a NOOP. DAG size: 193 [2020-07-21 23:24:52,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:24:52,183 INFO L93 Difference]: Finished difference Result 82 states and 113 transitions. [2020-07-21 23:24:52,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2020-07-21 23:24:52,184 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 43 [2020-07-21 23:24:52,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:24:52,185 INFO L225 Difference]: With dead ends: 82 [2020-07-21 23:24:52,186 INFO L226 Difference]: Without dead ends: 76 [2020-07-21 23:24:52,190 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2296 ImplicationChecksByTransitivity, 19.5s TimeCoverageRelationStatistics Valid=4408, Invalid=13952, Unknown=0, NotChecked=0, Total=18360 [2020-07-21 23:24:52,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-21 23:24:52,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2020-07-21 23:24:52,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 23:24:52,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 76 transitions. [2020-07-21 23:24:52,213 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 76 transitions. Word has length 43 [2020-07-21 23:24:52,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:24:52,214 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 76 transitions. [2020-07-21 23:24:52,214 INFO L480 AbstractCegarLoop]: Interpolant automaton has 70 states. [2020-07-21 23:24:52,214 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 76 transitions. [2020-07-21 23:24:52,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-07-21 23:24:52,216 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:24:52,216 INFO L422 BasicCegarLoop]: trace histogram [63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:24:52,430 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:24:52,432 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:24:52,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:24:52,433 INFO L82 PathProgramCache]: Analyzing trace with hash -1115480914, now seen corresponding path program 6 times [2020-07-21 23:24:52,433 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:24:52,433 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [65171318] [2020-07-21 23:24:52,434 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:24:52,514 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:24:52,515 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:24:52,520 WARN L261 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 260 conjunts are in the unsatisfiable core [2020-07-21 23:24:52,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:24:56,399 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 23:24:56,641 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 23:24:56,642 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:24:56,862 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:25:10,086 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 23:25:10,087 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [65171318] [2020-07-21 23:25:10,087 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:25:10,087 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69] total 134 [2020-07-21 23:25:10,088 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578631743] [2020-07-21 23:25:10,089 INFO L459 AbstractCegarLoop]: Interpolant automaton has 134 states [2020-07-21 23:25:10,089 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:25:10,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2020-07-21 23:25:10,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4238, Invalid=13584, Unknown=0, NotChecked=0, Total=17822 [2020-07-21 23:25:10,095 INFO L87 Difference]: Start difference. First operand 76 states and 76 transitions. Second operand 134 states. [2020-07-21 23:25:20,943 WARN L193 SmtUtils]: Spent 952.00 ms on a formula simplification that was a NOOP. DAG size: 390 [2020-07-21 23:25:22,736 WARN L193 SmtUtils]: Spent 1.34 s on a formula simplification. DAG size of input: 391 DAG size of output: 264 [2020-07-21 23:25:25,506 WARN L193 SmtUtils]: Spent 1.05 s on a formula simplification that was a NOOP. DAG size: 382 [2020-07-21 23:25:27,101 WARN L193 SmtUtils]: Spent 1.27 s on a formula simplification. DAG size of input: 386 DAG size of output: 260 [2020-07-21 23:25:29,648 WARN L193 SmtUtils]: Spent 981.00 ms on a formula simplification that was a NOOP. DAG size: 376 [2020-07-21 23:25:32,417 WARN L193 SmtUtils]: Spent 973.00 ms on a formula simplification that was a NOOP. DAG size: 370 [2020-07-21 23:25:34,985 WARN L193 SmtUtils]: Spent 957.00 ms on a formula simplification that was a NOOP. DAG size: 364 [2020-07-21 23:25:37,610 WARN L193 SmtUtils]: Spent 964.00 ms on a formula simplification that was a NOOP. DAG size: 358 [2020-07-21 23:25:40,256 WARN L193 SmtUtils]: Spent 974.00 ms on a formula simplification that was a NOOP. DAG size: 352 [2020-07-21 23:25:42,839 WARN L193 SmtUtils]: Spent 923.00 ms on a formula simplification that was a NOOP. DAG size: 346 [2020-07-21 23:25:45,429 WARN L193 SmtUtils]: Spent 916.00 ms on a formula simplification that was a NOOP. DAG size: 340 [2020-07-21 23:25:48,116 WARN L193 SmtUtils]: Spent 933.00 ms on a formula simplification that was a NOOP. DAG size: 334 [2020-07-21 23:25:50,678 WARN L193 SmtUtils]: Spent 868.00 ms on a formula simplification that was a NOOP. DAG size: 328 [2020-07-21 23:25:53,289 WARN L193 SmtUtils]: Spent 902.00 ms on a formula simplification that was a NOOP. DAG size: 322 [2020-07-21 23:25:55,861 WARN L193 SmtUtils]: Spent 877.00 ms on a formula simplification that was a NOOP. DAG size: 316 [2020-07-21 23:25:58,453 WARN L193 SmtUtils]: Spent 884.00 ms on a formula simplification that was a NOOP. DAG size: 310 [2020-07-21 23:26:01,023 WARN L193 SmtUtils]: Spent 849.00 ms on a formula simplification that was a NOOP. DAG size: 304 [2020-07-21 23:26:03,584 WARN L193 SmtUtils]: Spent 830.00 ms on a formula simplification that was a NOOP. DAG size: 298 [2020-07-21 23:26:06,164 WARN L193 SmtUtils]: Spent 835.00 ms on a formula simplification that was a NOOP. DAG size: 292 [2020-07-21 23:26:08,746 WARN L193 SmtUtils]: Spent 824.00 ms on a formula simplification that was a NOOP. DAG size: 286 [2020-07-21 23:26:11,357 WARN L193 SmtUtils]: Spent 818.00 ms on a formula simplification that was a NOOP. DAG size: 280 [2020-07-21 23:26:13,958 WARN L193 SmtUtils]: Spent 803.00 ms on a formula simplification that was a NOOP. DAG size: 274 [2020-07-21 23:26:16,551 WARN L193 SmtUtils]: Spent 798.00 ms on a formula simplification that was a NOOP. DAG size: 268 [2020-07-21 23:26:19,133 WARN L193 SmtUtils]: Spent 784.00 ms on a formula simplification that was a NOOP. DAG size: 262 [2020-07-21 23:26:21,707 WARN L193 SmtUtils]: Spent 785.00 ms on a formula simplification that was a NOOP. DAG size: 256 [2020-07-21 23:26:24,271 WARN L193 SmtUtils]: Spent 777.00 ms on a formula simplification that was a NOOP. DAG size: 250 [2020-07-21 23:26:26,909 WARN L193 SmtUtils]: Spent 767.00 ms on a formula simplification that was a NOOP. DAG size: 244 [2020-07-21 23:26:29,565 WARN L193 SmtUtils]: Spent 764.00 ms on a formula simplification that was a NOOP. DAG size: 238 [2020-07-21 23:26:32,118 WARN L193 SmtUtils]: Spent 742.00 ms on a formula simplification that was a NOOP. DAG size: 232 [2020-07-21 23:26:34,734 WARN L193 SmtUtils]: Spent 711.00 ms on a formula simplification that was a NOOP. DAG size: 226 [2020-07-21 23:26:37,314 WARN L193 SmtUtils]: Spent 698.00 ms on a formula simplification that was a NOOP. DAG size: 220 [2020-07-21 23:26:39,905 WARN L193 SmtUtils]: Spent 680.00 ms on a formula simplification that was a NOOP. DAG size: 214 [2020-07-21 23:26:42,523 WARN L193 SmtUtils]: Spent 718.00 ms on a formula simplification that was a NOOP. DAG size: 208 [2020-07-21 23:26:45,241 WARN L193 SmtUtils]: Spent 697.00 ms on a formula simplification that was a NOOP. DAG size: 202 [2020-07-21 23:26:47,947 WARN L193 SmtUtils]: Spent 694.00 ms on a formula simplification that was a NOOP. DAG size: 196 [2020-07-21 23:26:50,659 WARN L193 SmtUtils]: Spent 706.00 ms on a formula simplification that was a NOOP. DAG size: 190 [2020-07-21 23:26:53,324 WARN L193 SmtUtils]: Spent 659.00 ms on a formula simplification that was a NOOP. DAG size: 184 [2020-07-21 23:26:55,959 WARN L193 SmtUtils]: Spent 675.00 ms on a formula simplification that was a NOOP. DAG size: 178 [2020-07-21 23:26:58,532 WARN L193 SmtUtils]: Spent 622.00 ms on a formula simplification that was a NOOP. DAG size: 172 [2020-07-21 23:27:01,071 WARN L193 SmtUtils]: Spent 618.00 ms on a formula simplification that was a NOOP. DAG size: 166 [2020-07-21 23:27:03,572 WARN L193 SmtUtils]: Spent 585.00 ms on a formula simplification that was a NOOP. DAG size: 160 [2020-07-21 23:27:06,105 WARN L193 SmtUtils]: Spent 586.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2020-07-21 23:27:08,538 WARN L193 SmtUtils]: Spent 543.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2020-07-21 23:27:10,923 WARN L193 SmtUtils]: Spent 520.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-07-21 23:27:13,353 WARN L193 SmtUtils]: Spent 510.00 ms on a formula simplification that was a NOOP. DAG size: 136 [2020-07-21 23:27:15,679 WARN L193 SmtUtils]: Spent 498.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2020-07-21 23:27:18,032 WARN L193 SmtUtils]: Spent 490.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2020-07-21 23:27:20,202 WARN L193 SmtUtils]: Spent 435.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2020-07-21 23:27:22,390 WARN L193 SmtUtils]: Spent 434.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-21 23:27:24,610 WARN L193 SmtUtils]: Spent 425.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2020-07-21 23:27:26,719 WARN L193 SmtUtils]: Spent 376.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2020-07-21 23:27:28,743 WARN L193 SmtUtils]: Spent 355.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2020-07-21 23:27:30,708 WARN L193 SmtUtils]: Spent 321.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-21 23:27:32,598 WARN L193 SmtUtils]: Spent 335.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-21 23:27:34,354 WARN L193 SmtUtils]: Spent 287.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2020-07-21 23:27:36,081 WARN L193 SmtUtils]: Spent 267.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-21 23:27:37,652 WARN L193 SmtUtils]: Spent 220.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 23:27:39,161 WARN L193 SmtUtils]: Spent 207.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 23:27:40,553 WARN L193 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-21 23:27:41,897 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 23:27:43,150 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 23:27:44,296 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 23:27:53,845 WARN L193 SmtUtils]: Spent 1.97 s on a formula simplification that was a NOOP. DAG size: 385 [2020-07-21 23:27:53,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:27:53,863 INFO L93 Difference]: Finished difference Result 146 states and 209 transitions. [2020-07-21 23:27:53,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 134 states. [2020-07-21 23:27:53,867 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 75 [2020-07-21 23:27:53,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:27:53,870 INFO L225 Difference]: With dead ends: 146 [2020-07-21 23:27:53,870 INFO L226 Difference]: Without dead ends: 140 [2020-07-21 23:27:53,878 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 262 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8696 ImplicationChecksByTransitivity, 173.6s TimeCoverageRelationStatistics Valid=16984, Invalid=52448, Unknown=0, NotChecked=0, Total=69432 [2020-07-21 23:27:53,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2020-07-21 23:27:53,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 140. [2020-07-21 23:27:53,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-07-21 23:27:53,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 140 transitions. [2020-07-21 23:27:53,933 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 140 transitions. Word has length 75 [2020-07-21 23:27:53,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:27:53,933 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 140 transitions. [2020-07-21 23:27:53,933 INFO L480 AbstractCegarLoop]: Interpolant automaton has 134 states. [2020-07-21 23:27:53,933 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 140 transitions. [2020-07-21 23:27:53,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2020-07-21 23:27:53,937 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:27:53,937 INFO L422 BasicCegarLoop]: trace histogram [127, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:27:54,151 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:27:54,152 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:27:54,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:27:54,154 INFO L82 PathProgramCache]: Analyzing trace with hash -858019666, now seen corresponding path program 7 times [2020-07-21 23:27:54,154 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:27:54,155 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1749133430] [2020-07-21 23:27:54,155 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:27:54,303 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:27:54,303 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:27:54,324 WARN L261 TraceCheckSpWp]: Trace formula consists of 670 conjuncts, 516 conjunts are in the unsatisfiable core [2020-07-21 23:27:54,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:28:26,055 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 23:28:27,331 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 23:28:27,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:28:28,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 23:31:10,722 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 23:31:10,723 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1749133430] [2020-07-21 23:31:10,723 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:31:10,723 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [133, 133] total 262 [2020-07-21 23:31:10,723 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [910797999] [2020-07-21 23:31:10,725 INFO L459 AbstractCegarLoop]: Interpolant automaton has 262 states [2020-07-21 23:31:10,725 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:31:10,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 262 interpolants. [2020-07-21 23:31:10,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16654, Invalid=51728, Unknown=0, NotChecked=0, Total=68382 [2020-07-21 23:31:10,734 INFO L87 Difference]: Start difference. First operand 140 states and 140 transitions. Second operand 262 states. [2020-07-21 23:34:15,343 WARN L193 SmtUtils]: Spent 8.61 s on a formula simplification that was a NOOP. DAG size: 774 [2020-07-21 23:34:29,037 WARN L193 SmtUtils]: Spent 11.09 s on a formula simplification. DAG size of input: 775 DAG size of output: 520 [2020-07-21 23:35:40,356 WARN L193 SmtUtils]: Spent 11.99 s on a formula simplification that was a NOOP. DAG size: 766 [2020-07-21 23:35:54,637 WARN L193 SmtUtils]: Spent 12.56 s on a formula simplification. DAG size of input: 770 DAG size of output: 516 [2020-07-21 23:37:11,468 WARN L193 SmtUtils]: Spent 12.26 s on a formula simplification that was a NOOP. DAG size: 760 [2020-07-21 23:38:30,580 WARN L193 SmtUtils]: Spent 12.36 s on a formula simplification that was a NOOP. DAG size: 754