/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive/gcd01-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 16:31:05,891 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 16:31:05,894 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 16:31:05,908 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 16:31:05,908 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 16:31:05,910 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 16:31:05,913 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 16:31:05,915 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 16:31:05,917 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 16:31:05,917 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 16:31:05,919 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 16:31:05,920 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 16:31:05,920 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 16:31:05,921 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 16:31:05,923 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 16:31:05,924 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 16:31:05,925 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 16:31:05,925 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 16:31:05,927 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 16:31:05,929 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 16:31:05,931 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 16:31:05,933 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 16:31:05,934 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 16:31:05,935 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 16:31:05,938 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 16:31:05,946 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 16:31:05,955 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 16:31:05,956 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 16:31:05,957 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 16:31:05,973 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 16:31:05,974 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 16:31:05,975 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 16:31:05,975 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 16:31:05,976 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 16:31:05,976 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 16:31:05,976 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 16:31:05,976 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 16:31:05,976 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 16:31:05,977 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 16:31:05,977 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 16:31:05,977 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 16:31:05,977 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 16:31:05,977 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 16:31:05,978 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 16:31:05,978 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 16:31:05,978 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 16:31:05,978 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 16:31:05,979 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 16:31:05,979 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 16:31:05,979 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 16:31:05,979 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:31:05,979 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 16:31:05,980 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 16:31:05,980 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 16:31:05,980 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 16:31:05,980 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:31:05,980 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 16:31:05,981 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 16:31:05,981 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 16:31:06,268 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 16:31:06,282 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 16:31:06,285 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 16:31:06,287 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 16:31:06,287 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 16:31:06,288 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/gcd01-1.c [2020-07-20 16:31:06,357 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d9f6fafcf/4bee3ffe3a514600bc21a78898e3a02c/FLAG49e0dd4c2 [2020-07-20 16:31:06,801 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 16:31:06,801 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/gcd01-1.c [2020-07-20 16:31:06,810 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d9f6fafcf/4bee3ffe3a514600bc21a78898e3a02c/FLAG49e0dd4c2 [2020-07-20 16:31:07,182 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d9f6fafcf/4bee3ffe3a514600bc21a78898e3a02c [2020-07-20 16:31:07,192 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 16:31:07,196 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 16:31:07,197 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 16:31:07,197 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 16:31:07,201 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 16:31:07,202 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:31:07" (1/1) ... [2020-07-20 16:31:07,205 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@e50e1b2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:31:07, skipping insertion in model container [2020-07-20 16:31:07,205 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 04:31:07" (1/1) ... [2020-07-20 16:31:07,212 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 16:31:07,228 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 16:31:07,390 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:31:07,394 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 16:31:07,413 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 16:31:07,427 INFO L208 MainTranslator]: Completed translation [2020-07-20 16:31:07,428 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:31:07 WrapperNode [2020-07-20 16:31:07,428 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 16:31:07,429 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 16:31:07,429 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 16:31:07,429 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 16:31:07,443 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:31:07" (1/1) ... [2020-07-20 16:31:07,444 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:31:07" (1/1) ... [2020-07-20 16:31:07,449 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:31:07" (1/1) ... [2020-07-20 16:31:07,450 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:31:07" (1/1) ... [2020-07-20 16:31:07,453 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:31:07" (1/1) ... [2020-07-20 16:31:07,456 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:31:07" (1/1) ... [2020-07-20 16:31:07,457 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:31:07" (1/1) ... [2020-07-20 16:31:07,459 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 16:31:07,459 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 16:31:07,459 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 16:31:07,460 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 16:31:07,460 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:31:07" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 16:31:07,605 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 16:31:07,605 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 16:31:07,606 INFO L138 BoogieDeclarations]: Found implementation of procedure gcd [2020-07-20 16:31:07,606 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 16:31:07,606 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 16:31:07,606 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 16:31:07,606 INFO L130 BoogieDeclarations]: Found specification of procedure gcd [2020-07-20 16:31:07,606 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 16:31:07,607 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 16:31:07,607 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 16:31:07,806 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 16:31:07,806 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 16:31:07,811 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:31:07 BoogieIcfgContainer [2020-07-20 16:31:07,812 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 16:31:07,813 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 16:31:07,813 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 16:31:07,817 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 16:31:07,817 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 04:31:07" (1/3) ... [2020-07-20 16:31:07,818 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6fd23167 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:31:07, skipping insertion in model container [2020-07-20 16:31:07,818 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 04:31:07" (2/3) ... [2020-07-20 16:31:07,819 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6fd23167 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 04:31:07, skipping insertion in model container [2020-07-20 16:31:07,819 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 04:31:07" (3/3) ... [2020-07-20 16:31:07,821 INFO L109 eAbstractionObserver]: Analyzing ICFG gcd01-1.c [2020-07-20 16:31:07,832 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 16:31:07,848 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 16:31:07,898 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 16:31:07,953 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 16:31:07,954 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 16:31:07,954 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 16:31:07,954 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 16:31:07,954 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 16:31:07,954 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 16:31:07,954 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 16:31:07,955 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 16:31:07,975 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2020-07-20 16:31:07,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-20 16:31:07,983 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:31:07,984 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:31:07,985 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:31:07,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:31:07,991 INFO L82 PathProgramCache]: Analyzing trace with hash -1001932622, now seen corresponding path program 1 times [2020-07-20 16:31:07,998 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:31:07,998 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [602451589] [2020-07-20 16:31:07,999 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:31:08,070 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:31:08,071 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:31:08,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 16:31:08,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:31:08,179 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 16:31:08,184 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 16:31:08,203 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 16:31:08,205 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 16:31:08,207 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 16:31:08,224 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:31:08,225 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:31:08,226 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [602451589] [2020-07-20 16:31:08,227 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:31:08,227 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-20 16:31:08,228 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1348163277] [2020-07-20 16:31:08,234 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 16:31:08,234 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:31:08,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 16:31:08,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-20 16:31:08,252 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 6 states. [2020-07-20 16:31:08,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:31:08,421 INFO L93 Difference]: Finished difference Result 40 states and 49 transitions. [2020-07-20 16:31:08,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 16:31:08,423 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-07-20 16:31:08,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:31:08,436 INFO L225 Difference]: With dead ends: 40 [2020-07-20 16:31:08,436 INFO L226 Difference]: Without dead ends: 24 [2020-07-20 16:31:08,440 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-20 16:31:08,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-20 16:31:08,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-20 16:31:08,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-20 16:31:08,490 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2020-07-20 16:31:08,492 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 15 [2020-07-20 16:31:08,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:31:08,496 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2020-07-20 16:31:08,496 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 16:31:08,496 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2020-07-20 16:31:08,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-20 16:31:08,499 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:31:08,499 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:31:08,713 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:31:08,714 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:31:08,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:31:08,715 INFO L82 PathProgramCache]: Analyzing trace with hash -423841111, now seen corresponding path program 1 times [2020-07-20 16:31:08,715 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:31:08,716 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1874825014] [2020-07-20 16:31:08,717 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:31:08,766 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:31:08,766 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:31:08,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 16:31:08,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:31:08,827 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 16:31:08,828 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:31:08,828 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1874825014] [2020-07-20 16:31:08,828 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:31:08,829 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-20 16:31:08,829 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [714054390] [2020-07-20 16:31:08,831 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-20 16:31:08,831 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:31:08,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-20 16:31:08,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-07-20 16:31:08,832 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand 7 states. [2020-07-20 16:31:08,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:31:08,965 INFO L93 Difference]: Finished difference Result 30 states and 36 transitions. [2020-07-20 16:31:08,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:31:08,966 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-07-20 16:31:08,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:31:08,967 INFO L225 Difference]: With dead ends: 30 [2020-07-20 16:31:08,967 INFO L226 Difference]: Without dead ends: 26 [2020-07-20 16:31:08,969 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-07-20 16:31:08,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-07-20 16:31:08,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2020-07-20 16:31:08,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-20 16:31:08,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2020-07-20 16:31:08,978 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 16 [2020-07-20 16:31:08,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:31:08,979 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2020-07-20 16:31:08,979 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-20 16:31:08,979 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2020-07-20 16:31:08,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 16:31:08,980 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:31:08,981 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:31:09,195 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:31:09,196 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:31:09,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:31:09,197 INFO L82 PathProgramCache]: Analyzing trace with hash -1280495258, now seen corresponding path program 1 times [2020-07-20 16:31:09,198 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:31:09,198 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [187493751] [2020-07-20 16:31:09,199 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:31:09,228 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:31:09,228 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:31:09,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 16:31:09,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:31:09,269 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 16:31:09,271 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 16:31:09,288 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 16:31:09,289 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 16:31:09,293 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 16:31:09,323 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:31:09,324 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:31:09,324 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [187493751] [2020-07-20 16:31:09,324 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:31:09,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-20 16:31:09,338 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [52324096] [2020-07-20 16:31:09,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 16:31:09,339 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:31:09,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 16:31:09,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-07-20 16:31:09,339 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand 8 states. [2020-07-20 16:31:09,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:31:09,493 INFO L93 Difference]: Finished difference Result 35 states and 44 transitions. [2020-07-20 16:31:09,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:31:09,494 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2020-07-20 16:31:09,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:31:09,496 INFO L225 Difference]: With dead ends: 35 [2020-07-20 16:31:09,496 INFO L226 Difference]: Without dead ends: 31 [2020-07-20 16:31:09,497 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:31:09,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-20 16:31:09,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 27. [2020-07-20 16:31:09,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-20 16:31:09,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 33 transitions. [2020-07-20 16:31:09,506 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 33 transitions. Word has length 23 [2020-07-20 16:31:09,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:31:09,506 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 33 transitions. [2020-07-20 16:31:09,506 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 16:31:09,506 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 33 transitions. [2020-07-20 16:31:09,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-20 16:31:09,508 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:31:09,508 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:31:09,708 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:31:09,709 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:31:09,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:31:09,710 INFO L82 PathProgramCache]: Analyzing trace with hash 1668712292, now seen corresponding path program 1 times [2020-07-20 16:31:09,710 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:31:09,710 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1418858645] [2020-07-20 16:31:09,710 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:31:09,736 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:31:09,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:31:09,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 16:31:09,739 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:31:09,794 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 16:31:09,797 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 16:31:09,815 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 16:31:09,816 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 16:31:09,818 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 16:31:09,833 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 16:31:09,834 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:31:09,834 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1418858645] [2020-07-20 16:31:09,834 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:31:09,835 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-07-20 16:31:09,835 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [486358962] [2020-07-20 16:31:09,835 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 16:31:09,836 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:31:09,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 16:31:09,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-07-20 16:31:09,836 INFO L87 Difference]: Start difference. First operand 27 states and 33 transitions. Second operand 9 states. [2020-07-20 16:31:09,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:31:09,997 INFO L93 Difference]: Finished difference Result 39 states and 49 transitions. [2020-07-20 16:31:09,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:31:09,998 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2020-07-20 16:31:09,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:31:09,999 INFO L225 Difference]: With dead ends: 39 [2020-07-20 16:31:10,000 INFO L226 Difference]: Without dead ends: 35 [2020-07-20 16:31:10,001 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2020-07-20 16:31:10,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-20 16:31:10,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2020-07-20 16:31:10,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-20 16:31:10,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 40 transitions. [2020-07-20 16:31:10,009 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 40 transitions. Word has length 23 [2020-07-20 16:31:10,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:31:10,010 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 40 transitions. [2020-07-20 16:31:10,010 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 16:31:10,010 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 40 transitions. [2020-07-20 16:31:10,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 16:31:10,012 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:31:10,012 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:31:10,227 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:31:10,228 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:31:10,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:31:10,228 INFO L82 PathProgramCache]: Analyzing trace with hash -1139697511, now seen corresponding path program 1 times [2020-07-20 16:31:10,229 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:31:10,229 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2445477] [2020-07-20 16:31:10,230 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:31:10,259 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:31:10,260 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:31:10,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 16:31:10,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:31:10,320 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:31:10,320 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:31:10,320 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2445477] [2020-07-20 16:31:10,321 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:31:10,321 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-20 16:31:10,321 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278974362] [2020-07-20 16:31:10,322 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-20 16:31:10,322 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:31:10,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-20 16:31:10,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-07-20 16:31:10,323 INFO L87 Difference]: Start difference. First operand 32 states and 40 transitions. Second operand 7 states. [2020-07-20 16:31:10,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:31:10,441 INFO L93 Difference]: Finished difference Result 39 states and 48 transitions. [2020-07-20 16:31:10,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:31:10,442 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-07-20 16:31:10,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:31:10,444 INFO L225 Difference]: With dead ends: 39 [2020-07-20 16:31:10,444 INFO L226 Difference]: Without dead ends: 35 [2020-07-20 16:31:10,448 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-07-20 16:31:10,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-20 16:31:10,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 30. [2020-07-20 16:31:10,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 16:31:10,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 16:31:10,456 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 24 [2020-07-20 16:31:10,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:31:10,456 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 16:31:10,456 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-20 16:31:10,457 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 16:31:10,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 16:31:10,457 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:31:10,458 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:31:10,668 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:31:10,669 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:31:10,669 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:31:10,670 INFO L82 PathProgramCache]: Analyzing trace with hash 99153721, now seen corresponding path program 1 times [2020-07-20 16:31:10,670 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:31:10,671 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [321353445] [2020-07-20 16:31:10,671 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:31:10,702 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:31:10,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:31:10,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 16:31:10,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:31:10,797 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:31:10,798 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:31:10,798 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [321353445] [2020-07-20 16:31:10,798 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:31:10,799 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-20 16:31:10,799 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204544435] [2020-07-20 16:31:10,800 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 16:31:10,800 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:31:10,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 16:31:10,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-07-20 16:31:10,801 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 8 states. [2020-07-20 16:31:10,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:31:10,938 INFO L93 Difference]: Finished difference Result 39 states and 48 transitions. [2020-07-20 16:31:10,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 16:31:10,939 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-07-20 16:31:10,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:31:10,941 INFO L225 Difference]: With dead ends: 39 [2020-07-20 16:31:10,941 INFO L226 Difference]: Without dead ends: 35 [2020-07-20 16:31:10,942 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-07-20 16:31:10,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-20 16:31:10,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 30. [2020-07-20 16:31:10,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 16:31:10,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 16:31:10,955 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 24 [2020-07-20 16:31:10,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:31:10,956 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 16:31:10,956 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 16:31:10,956 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 16:31:10,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 16:31:10,958 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:31:10,958 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:31:11,163 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:31:11,164 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:31:11,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:31:11,165 INFO L82 PathProgramCache]: Analyzing trace with hash -1008405900, now seen corresponding path program 1 times [2020-07-20 16:31:11,166 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:31:11,168 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [438152137] [2020-07-20 16:31:11,169 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:31:11,194 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:31:11,194 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:31:11,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 16:31:11,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:31:11,248 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 16:31:11,249 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 16:31:11,266 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 16:31:11,267 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 16:31:11,277 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 16:31:11,282 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 16:31:11,283 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:31:11,283 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [438152137] [2020-07-20 16:31:11,283 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:31:11,283 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-20 16:31:11,284 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436193830] [2020-07-20 16:31:11,284 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-20 16:31:11,284 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:31:11,285 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-20 16:31:11,285 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-07-20 16:31:11,286 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 7 states. [2020-07-20 16:31:11,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:31:11,412 INFO L93 Difference]: Finished difference Result 45 states and 57 transitions. [2020-07-20 16:31:11,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 16:31:11,412 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 31 [2020-07-20 16:31:11,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:31:11,413 INFO L225 Difference]: With dead ends: 45 [2020-07-20 16:31:11,413 INFO L226 Difference]: Without dead ends: 34 [2020-07-20 16:31:11,414 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 16:31:11,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-20 16:31:11,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-07-20 16:31:11,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-20 16:31:11,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2020-07-20 16:31:11,421 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 31 [2020-07-20 16:31:11,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:31:11,422 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2020-07-20 16:31:11,422 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-20 16:31:11,422 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2020-07-20 16:31:11,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-07-20 16:31:11,423 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:31:11,423 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:31:11,628 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:31:11,629 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:31:11,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:31:11,630 INFO L82 PathProgramCache]: Analyzing trace with hash 10057033, now seen corresponding path program 1 times [2020-07-20 16:31:11,630 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:31:11,631 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1159165913] [2020-07-20 16:31:11,631 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:31:11,660 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:31:11,660 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:31:11,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 16:31:11,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:31:15,982 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 16:31:15,983 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:31:17,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:31:17,191 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:31:17,450 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-20 16:31:17,451 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:31:17,452 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:31:17,570 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 16:31:17,570 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1159165913] [2020-07-20 16:31:17,570 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:31:17,571 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12] total 21 [2020-07-20 16:31:17,571 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [449909040] [2020-07-20 16:31:17,571 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 16:31:17,571 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:31:17,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 16:31:17,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=361, Unknown=2, NotChecked=0, Total=420 [2020-07-20 16:31:17,572 INFO L87 Difference]: Start difference. First operand 32 states and 39 transitions. Second operand 21 states. [2020-07-20 16:31:35,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:31:35,277 INFO L93 Difference]: Finished difference Result 53 states and 66 transitions. [2020-07-20 16:31:35,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 16:31:35,279 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 32 [2020-07-20 16:31:35,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:31:35,281 INFO L225 Difference]: With dead ends: 53 [2020-07-20 16:31:35,281 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 16:31:35,282 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 41 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=145, Invalid=719, Unknown=6, NotChecked=0, Total=870 [2020-07-20 16:31:35,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 16:31:35,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 41. [2020-07-20 16:31:35,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 16:31:35,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 51 transitions. [2020-07-20 16:31:35,292 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 51 transitions. Word has length 32 [2020-07-20 16:31:35,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:31:35,293 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 51 transitions. [2020-07-20 16:31:35,293 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 16:31:35,293 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 51 transitions. [2020-07-20 16:31:35,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-07-20 16:31:35,294 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:31:35,294 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:31:35,498 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:31:35,499 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:31:35,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:31:35,500 INFO L82 PathProgramCache]: Analyzing trace with hash -1704164087, now seen corresponding path program 2 times [2020-07-20 16:31:35,501 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:31:35,501 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1942577544] [2020-07-20 16:31:35,502 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:31:35,530 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:31:35,531 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:31:35,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 16:31:35,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:31:41,582 WARN L193 SmtUtils]: Spent 1.78 s on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 16:31:44,387 WARN L193 SmtUtils]: Spent 666.00 ms on a formula simplification that was a NOOP. DAG size: 11 [2020-07-20 16:31:48,570 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-07-20 16:31:48,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:31:49,476 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2020-07-20 16:31:49,689 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:31:56,869 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 16:31:56,995 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-20 16:31:57,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:32:01,627 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:32:04,067 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-07-20 16:32:04,067 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1942577544] [2020-07-20 16:32:04,067 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:32:04,068 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 18 [2020-07-20 16:32:04,068 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560004450] [2020-07-20 16:32:04,069 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 16:32:04,069 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:32:04,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 16:32:04,070 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=258, Unknown=4, NotChecked=0, Total=306 [2020-07-20 16:32:04,070 INFO L87 Difference]: Start difference. First operand 41 states and 51 transitions. Second operand 18 states. [2020-07-20 16:32:18,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:32:18,211 INFO L93 Difference]: Finished difference Result 54 states and 67 transitions. [2020-07-20 16:32:18,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:32:18,217 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 32 [2020-07-20 16:32:18,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:32:18,219 INFO L225 Difference]: With dead ends: 54 [2020-07-20 16:32:18,219 INFO L226 Difference]: Without dead ends: 50 [2020-07-20 16:32:18,220 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 41 SyntacticMatches, 6 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 32.1s TimeCoverageRelationStatistics Valid=94, Invalid=453, Unknown=5, NotChecked=0, Total=552 [2020-07-20 16:32:18,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-20 16:32:18,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 44. [2020-07-20 16:32:18,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-20 16:32:18,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 55 transitions. [2020-07-20 16:32:18,231 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 55 transitions. Word has length 32 [2020-07-20 16:32:18,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:32:18,231 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 55 transitions. [2020-07-20 16:32:18,232 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 16:32:18,232 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 55 transitions. [2020-07-20 16:32:18,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 16:32:18,233 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:32:18,233 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:32:18,438 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:32:18,439 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:32:18,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:32:18,440 INFO L82 PathProgramCache]: Analyzing trace with hash 240924720, now seen corresponding path program 2 times [2020-07-20 16:32:18,440 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:32:18,441 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1547902539] [2020-07-20 16:32:18,441 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:32:18,489 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 16:32:18,489 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:32:18,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 16:32:18,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:32:18,597 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 16:32:18,599 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 16:32:18,647 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 16:32:18,648 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 16:32:18,652 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 16:32:18,655 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 16:32:18,655 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 16:32:18,655 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1547902539] [2020-07-20 16:32:18,656 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 16:32:18,656 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-20 16:32:18,656 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082532140] [2020-07-20 16:32:18,657 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 16:32:18,657 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:32:18,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 16:32:18,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-07-20 16:32:18,657 INFO L87 Difference]: Start difference. First operand 44 states and 55 transitions. Second operand 6 states. [2020-07-20 16:32:19,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:32:19,106 INFO L93 Difference]: Finished difference Result 57 states and 72 transitions. [2020-07-20 16:32:19,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 16:32:19,117 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 31 [2020-07-20 16:32:19,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:32:19,118 INFO L225 Difference]: With dead ends: 57 [2020-07-20 16:32:19,119 INFO L226 Difference]: Without dead ends: 44 [2020-07-20 16:32:19,123 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2020-07-20 16:32:19,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-07-20 16:32:19,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2020-07-20 16:32:19,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-20 16:32:19,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 52 transitions. [2020-07-20 16:32:19,148 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 52 transitions. Word has length 31 [2020-07-20 16:32:19,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:32:19,149 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 52 transitions. [2020-07-20 16:32:19,149 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 16:32:19,149 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 52 transitions. [2020-07-20 16:32:19,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 16:32:19,154 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:32:19,154 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:32:19,355 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:32:19,356 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:32:19,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:32:19,357 INFO L82 PathProgramCache]: Analyzing trace with hash 41666553, now seen corresponding path program 3 times [2020-07-20 16:32:19,357 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:32:19,358 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [149548751] [2020-07-20 16:32:19,358 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:32:19,410 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:32:19,410 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:32:19,412 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 16:32:19,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:32:22,381 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 11 proven. 11 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 16:32:22,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:32:23,173 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:32:23,284 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:32:23,414 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 16:32:23,547 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 16:32:23,701 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2020-07-20 16:32:23,853 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2020-07-20 16:32:24,042 WARN L193 SmtUtils]: Spent 182.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:32:24,217 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:32:24,398 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:32:24,587 WARN L193 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:32:24,780 WARN L193 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 16:32:24,969 WARN L193 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:32:25,141 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 16:32:25,308 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 16:32:25,460 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:32:25,604 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 16:32:25,740 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 16:32:25,865 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:32:25,980 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 16:32:26,091 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 16:32:26,226 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2020-07-20 16:32:26,350 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 16:32:29,267 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 16:32:29,370 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 16:32:29,489 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2020-07-20 16:32:29,604 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2020-07-20 16:32:29,740 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 16:32:29,874 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:32:29,996 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:32:30,103 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:32:30,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:32:31,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:32:32,637 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [149548751] [2020-07-20 16:32:32,638 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 16:32:32,638 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-07-20 16:32:32,638 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851628389] [2020-07-20 16:32:32,639 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 16:32:32,639 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:32:32,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 16:32:32,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=364, Unknown=2, NotChecked=0, Total=420 [2020-07-20 16:32:32,640 INFO L87 Difference]: Start difference. First operand 42 states and 52 transitions. Second operand 12 states. [2020-07-20 16:33:06,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:33:06,398 INFO L93 Difference]: Finished difference Result 52 states and 64 transitions. [2020-07-20 16:33:06,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 16:33:06,405 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-20 16:33:06,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:33:06,407 INFO L225 Difference]: With dead ends: 52 [2020-07-20 16:33:06,407 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 16:33:06,408 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 23.0s TimeCoverageRelationStatistics Valid=105, Invalid=589, Unknown=8, NotChecked=0, Total=702 [2020-07-20 16:33:06,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 16:33:06,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 43. [2020-07-20 16:33:06,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-07-20 16:33:06,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 53 transitions. [2020-07-20 16:33:06,415 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 53 transitions. Word has length 40 [2020-07-20 16:33:06,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:33:06,416 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 53 transitions. [2020-07-20 16:33:06,416 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 16:33:06,416 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 53 transitions. [2020-07-20 16:33:06,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 16:33:06,417 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:33:06,417 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:33:06,618 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:33:06,619 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:33:06,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:33:06,619 INFO L82 PathProgramCache]: Analyzing trace with hash -822573927, now seen corresponding path program 4 times [2020-07-20 16:33:06,619 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:33:06,619 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [800256577] [2020-07-20 16:33:06,620 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:33:06,675 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:33:06,676 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:33:06,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 16:33:06,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:33:15,828 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 9 proven. 13 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 16:33:15,828 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:33:18,738 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:33:18,858 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:33:19,017 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:33:19,169 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:33:19,354 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:33:19,531 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:33:19,762 WARN L193 SmtUtils]: Spent 220.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 16:33:19,958 WARN L193 SmtUtils]: Spent 193.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 16:33:20,246 WARN L193 SmtUtils]: Spent 282.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:33:20,461 WARN L193 SmtUtils]: Spent 212.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:33:20,681 WARN L193 SmtUtils]: Spent 213.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-20 16:33:20,874 WARN L193 SmtUtils]: Spent 189.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 16:33:21,061 WARN L193 SmtUtils]: Spent 183.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 16:33:21,234 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-20 16:33:21,401 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 16:33:21,556 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 16:33:21,701 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:33:21,838 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 16:33:21,971 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:33:22,109 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:33:22,250 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 16:33:22,386 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 16:33:22,495 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 16:33:25,249 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:33:25,372 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:33:25,514 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:33:25,653 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:33:25,830 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:33:26,011 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:33:26,214 WARN L193 SmtUtils]: Spent 196.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:33:26,409 WARN L193 SmtUtils]: Spent 191.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:33:26,576 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 16:33:26,735 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 16:33:26,870 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:33:26,996 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:33:27,108 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2020-07-20 16:33:27,214 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:33:27,580 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [800256577] [2020-07-20 16:33:27,580 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 16:33:27,580 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-07-20 16:33:27,581 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1171834507] [2020-07-20 16:33:27,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 16:33:27,582 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:33:27,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 16:33:27,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=257, Unknown=5, NotChecked=0, Total=306 [2020-07-20 16:33:27,583 INFO L87 Difference]: Start difference. First operand 43 states and 53 transitions. Second operand 13 states. [2020-07-20 16:34:23,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:34:23,443 INFO L93 Difference]: Finished difference Result 52 states and 64 transitions. [2020-07-20 16:34:23,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 16:34:23,456 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 40 [2020-07-20 16:34:23,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:34:23,457 INFO L225 Difference]: With dead ends: 52 [2020-07-20 16:34:23,457 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 16:34:23,458 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 43.8s TimeCoverageRelationStatistics Valid=92, Invalid=491, Unknown=17, NotChecked=0, Total=600 [2020-07-20 16:34:23,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 16:34:23,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 43. [2020-07-20 16:34:23,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-07-20 16:34:23,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 53 transitions. [2020-07-20 16:34:23,468 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 53 transitions. Word has length 40 [2020-07-20 16:34:23,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:34:23,468 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 53 transitions. [2020-07-20 16:34:23,468 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 16:34:23,468 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 53 transitions. [2020-07-20 16:34:23,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 16:34:23,470 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:34:23,470 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:34:23,679 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:34:23,680 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:34:23,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:34:23,680 INFO L82 PathProgramCache]: Analyzing trace with hash -2022810407, now seen corresponding path program 5 times [2020-07-20 16:34:23,681 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:34:23,681 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1400401322] [2020-07-20 16:34:23,682 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:34:23,747 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:34:23,747 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:34:23,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 16:34:23,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:34:37,709 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 9 proven. 13 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 16:34:37,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:34:38,381 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2020-07-20 16:34:38,582 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:34:38,701 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:34:38,869 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:34:39,032 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:34:39,243 WARN L193 SmtUtils]: Spent 205.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:34:39,451 WARN L193 SmtUtils]: Spent 203.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:34:39,704 WARN L193 SmtUtils]: Spent 246.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:34:39,957 WARN L193 SmtUtils]: Spent 247.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:34:40,256 WARN L193 SmtUtils]: Spent 293.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:34:40,553 WARN L193 SmtUtils]: Spent 291.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:34:40,887 WARN L193 SmtUtils]: Spent 327.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 16:34:41,207 WARN L193 SmtUtils]: Spent 315.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 16:34:41,566 WARN L193 SmtUtils]: Spent 353.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:34:41,933 WARN L193 SmtUtils]: Spent 362.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:34:42,301 WARN L193 SmtUtils]: Spent 359.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-20 16:34:42,645 WARN L193 SmtUtils]: Spent 339.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 16:34:42,980 WARN L193 SmtUtils]: Spent 329.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 16:34:43,297 WARN L193 SmtUtils]: Spent 311.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:34:43,595 WARN L193 SmtUtils]: Spent 293.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 16:34:43,879 WARN L193 SmtUtils]: Spent 278.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:34:44,159 WARN L193 SmtUtils]: Spent 264.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 16:34:44,415 WARN L193 SmtUtils]: Spent 251.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 16:34:44,656 WARN L193 SmtUtils]: Spent 235.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:34:44,877 WARN L193 SmtUtils]: Spent 215.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:34:45,089 WARN L193 SmtUtils]: Spent 207.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 16:34:45,283 WARN L193 SmtUtils]: Spent 188.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 16:34:45,462 WARN L193 SmtUtils]: Spent 174.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2020-07-20 16:34:45,628 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-20 16:34:46,457 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:34:46,576 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:34:46,739 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:34:46,901 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:34:47,109 WARN L193 SmtUtils]: Spent 202.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:34:47,319 WARN L193 SmtUtils]: Spent 204.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:34:47,574 WARN L193 SmtUtils]: Spent 248.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:34:47,822 WARN L193 SmtUtils]: Spent 242.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:34:48,136 WARN L193 SmtUtils]: Spent 308.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:34:48,437 WARN L193 SmtUtils]: Spent 296.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:34:48,736 WARN L193 SmtUtils]: Spent 290.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 16:34:49,022 WARN L193 SmtUtils]: Spent 281.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 16:34:49,289 WARN L193 SmtUtils]: Spent 261.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 16:34:49,543 WARN L193 SmtUtils]: Spent 249.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 16:34:49,781 WARN L193 SmtUtils]: Spent 232.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:34:50,005 WARN L193 SmtUtils]: Spent 218.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:34:50,213 WARN L193 SmtUtils]: Spent 203.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:34:50,418 WARN L193 SmtUtils]: Spent 188.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:34:50,596 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2020-07-20 16:34:50,758 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:34:51,059 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:34:51,962 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:34:52,080 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:34:52,243 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:34:52,403 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:34:52,610 WARN L193 SmtUtils]: Spent 201.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:34:52,814 WARN L193 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:34:53,020 WARN L193 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:34:53,211 WARN L193 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 16:34:53,387 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2020-07-20 16:34:53,541 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2020-07-20 16:34:53,846 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-20 16:34:53,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:34:53,847 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:34:55,095 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-20 16:34:55,096 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-20 16:34:55,103 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:34:55,103 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:34:55,211 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-07-20 16:34:55,212 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1400401322] [2020-07-20 16:34:55,212 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:34:55,212 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-20 16:34:55,213 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1365202141] [2020-07-20 16:34:55,216 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 16:34:55,216 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:34:55,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 16:34:55,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=477, Unknown=6, NotChecked=0, Total=552 [2020-07-20 16:34:55,217 INFO L87 Difference]: Start difference. First operand 43 states and 53 transitions. Second operand 24 states. [2020-07-20 16:35:03,046 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2020-07-20 16:35:08,061 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2020-07-20 16:35:16,537 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2020-07-20 16:35:20,632 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-20 16:35:23,391 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 16:35:23,912 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 16:35:24,282 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-20 16:35:25,577 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 16:35:35,624 WARN L193 SmtUtils]: Spent 585.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 25 [2020-07-20 16:35:44,012 WARN L193 SmtUtils]: Spent 1.47 s on a formula simplification. DAG size of input: 27 DAG size of output: 25 [2020-07-20 16:35:49,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:35:49,663 INFO L93 Difference]: Finished difference Result 69 states and 89 transitions. [2020-07-20 16:35:49,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-20 16:35:49,678 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 40 [2020-07-20 16:35:49,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:35:49,679 INFO L225 Difference]: With dead ends: 69 [2020-07-20 16:35:49,680 INFO L226 Difference]: Without dead ends: 63 [2020-07-20 16:35:49,681 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 53 SyntacticMatches, 4 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 44.8s TimeCoverageRelationStatistics Valid=213, Invalid=1104, Unknown=15, NotChecked=0, Total=1332 [2020-07-20 16:35:49,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-20 16:35:49,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 49. [2020-07-20 16:35:49,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-07-20 16:35:49,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 62 transitions. [2020-07-20 16:35:49,691 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 62 transitions. Word has length 40 [2020-07-20 16:35:49,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:35:49,692 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 62 transitions. [2020-07-20 16:35:49,692 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 16:35:49,692 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 62 transitions. [2020-07-20 16:35:49,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 16:35:49,694 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:35:49,694 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:35:49,908 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:49,909 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:35:49,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:35:49,909 INFO L82 PathProgramCache]: Analyzing trace with hash -390484327, now seen corresponding path program 6 times [2020-07-20 16:35:49,910 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:35:49,910 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [647077456] [2020-07-20 16:35:49,911 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:35:49,991 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 16:35:49,992 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:35:49,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 16:35:49,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:35:56,376 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 11 proven. 11 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 16:35:56,376 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:35:57,260 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:35:57,396 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:35:57,584 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:35:57,770 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:35:58,007 WARN L193 SmtUtils]: Spent 230.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:35:58,244 WARN L193 SmtUtils]: Spent 232.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:35:58,515 WARN L193 SmtUtils]: Spent 264.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 16:35:58,802 WARN L193 SmtUtils]: Spent 281.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 16:35:59,121 WARN L193 SmtUtils]: Spent 312.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2020-07-20 16:35:59,424 WARN L193 SmtUtils]: Spent 297.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2020-07-20 16:35:59,761 WARN L193 SmtUtils]: Spent 329.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:36:00,104 WARN L193 SmtUtils]: Spent 337.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:36:00,486 WARN L193 SmtUtils]: Spent 374.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:36:00,889 WARN L193 SmtUtils]: Spent 397.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:36:01,273 WARN L193 SmtUtils]: Spent 375.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 16:36:01,633 WARN L193 SmtUtils]: Spent 354.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:36:01,978 WARN L193 SmtUtils]: Spent 339.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 16:36:02,300 WARN L193 SmtUtils]: Spent 316.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:36:02,605 WARN L193 SmtUtils]: Spent 298.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:36:02,892 WARN L193 SmtUtils]: Spent 281.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 16:36:03,165 WARN L193 SmtUtils]: Spent 267.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:36:03,411 WARN L193 SmtUtils]: Spent 240.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 16:36:03,649 WARN L193 SmtUtils]: Spent 232.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:36:03,876 WARN L193 SmtUtils]: Spent 220.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 16:36:04,082 WARN L193 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-20 16:36:04,272 WARN L193 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-20 16:36:05,220 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:36:05,358 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:36:05,542 WARN L193 SmtUtils]: Spent 177.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:36:05,729 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:36:05,968 WARN L193 SmtUtils]: Spent 233.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:36:06,205 WARN L193 SmtUtils]: Spent 231.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:36:06,482 WARN L193 SmtUtils]: Spent 270.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 16:36:06,750 WARN L193 SmtUtils]: Spent 261.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 16:36:07,056 WARN L193 SmtUtils]: Spent 298.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2020-07-20 16:36:07,364 WARN L193 SmtUtils]: Spent 302.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2020-07-20 16:36:07,673 WARN L193 SmtUtils]: Spent 300.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 16:36:07,963 WARN L193 SmtUtils]: Spent 283.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 16:36:08,233 WARN L193 SmtUtils]: Spent 264.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 16:36:08,488 WARN L193 SmtUtils]: Spent 248.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:36:08,724 WARN L193 SmtUtils]: Spent 230.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:36:08,943 WARN L193 SmtUtils]: Spent 213.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 16:36:09,148 WARN L193 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 16:36:09,335 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2020-07-20 16:36:09,655 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:10,299 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:36:10,438 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:36:10,624 WARN L193 SmtUtils]: Spent 179.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:36:10,810 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:36:11,048 WARN L193 SmtUtils]: Spent 231.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:36:11,284 WARN L193 SmtUtils]: Spent 231.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:36:11,532 WARN L193 SmtUtils]: Spent 239.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 16:36:11,752 WARN L193 SmtUtils]: Spent 214.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 16:36:11,965 WARN L193 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 16:36:12,155 WARN L193 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:36:12,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:12,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:13,475 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:36:13,609 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:36:14,036 INFO L501 QuantifierPusher]: Distributing 3 disjuncts over 2 conjuncts [2020-07-20 16:36:14,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:14,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 16:36:14,478 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2020-07-20 16:36:14,957 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 16:36:15,102 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 2 proven. 22 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-07-20 16:36:15,103 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [647077456] [2020-07-20 16:36:15,103 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 16:36:15,103 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 23 [2020-07-20 16:36:15,103 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764355714] [2020-07-20 16:36:15,104 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 16:36:15,104 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:36:15,104 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 16:36:15,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=440, Unknown=2, NotChecked=0, Total=506 [2020-07-20 16:36:15,105 INFO L87 Difference]: Start difference. First operand 49 states and 62 transitions. Second operand 23 states. [2020-07-20 16:36:19,724 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-20 16:36:24,697 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-20 16:36:29,519 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2020-07-20 16:36:36,399 WARN L193 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 24 [2020-07-20 16:36:39,110 WARN L193 SmtUtils]: Spent 191.00 ms on a formula simplification that was a NOOP. DAG size: 24 [2020-07-20 16:36:39,839 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 16:36:45,029 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 16:36:45,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:36:45,602 INFO L93 Difference]: Finished difference Result 78 states and 102 transitions. [2020-07-20 16:36:45,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 16:36:45,618 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 40 [2020-07-20 16:36:45,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:36:45,620 INFO L225 Difference]: With dead ends: 78 [2020-07-20 16:36:45,620 INFO L226 Difference]: Without dead ends: 72 [2020-07-20 16:36:45,621 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 53 SyntacticMatches, 5 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 28.9s TimeCoverageRelationStatistics Valid=166, Invalid=881, Unknown=9, NotChecked=0, Total=1056 [2020-07-20 16:36:45,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-20 16:36:45,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 53. [2020-07-20 16:36:45,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-20 16:36:45,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 67 transitions. [2020-07-20 16:36:45,648 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 67 transitions. Word has length 40 [2020-07-20 16:36:45,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:36:45,649 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 67 transitions. [2020-07-20 16:36:45,649 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 16:36:45,649 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 67 transitions. [2020-07-20 16:36:45,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-07-20 16:36:45,653 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:36:45,653 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:36:45,866 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:36:45,867 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:36:45,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:36:45,867 INFO L82 PathProgramCache]: Analyzing trace with hash 1763302729, now seen corresponding path program 7 times [2020-07-20 16:36:45,868 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:36:45,868 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [399129437] [2020-07-20 16:36:45,868 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:36:45,972 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:36:45,973 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:36:45,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-20 16:36:45,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:37:13,098 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 13 proven. 23 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-20 16:37:13,098 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:37:18,336 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:37:18,489 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:37:18,699 WARN L193 SmtUtils]: Spent 203.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:37:18,908 WARN L193 SmtUtils]: Spent 202.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:37:19,174 WARN L193 SmtUtils]: Spent 259.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:37:19,439 WARN L193 SmtUtils]: Spent 258.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:37:19,768 WARN L193 SmtUtils]: Spent 320.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:37:20,088 WARN L193 SmtUtils]: Spent 313.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:37:20,474 WARN L193 SmtUtils]: Spent 378.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:37:20,856 WARN L193 SmtUtils]: Spent 375.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:37:21,322 WARN L193 SmtUtils]: Spent 458.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:37:21,765 WARN L193 SmtUtils]: Spent 438.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:37:22,274 WARN L193 SmtUtils]: Spent 501.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:37:22,776 WARN L193 SmtUtils]: Spent 494.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:37:23,330 WARN L193 SmtUtils]: Spent 545.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 16:37:23,880 WARN L193 SmtUtils]: Spent 542.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 16:37:24,469 WARN L193 SmtUtils]: Spent 580.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:37:25,053 WARN L193 SmtUtils]: Spent 578.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:37:25,656 WARN L193 SmtUtils]: Spent 591.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-20 16:37:26,231 WARN L193 SmtUtils]: Spent 568.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2020-07-20 16:37:26,776 WARN L193 SmtUtils]: Spent 538.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-20 16:37:27,320 WARN L193 SmtUtils]: Spent 537.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2020-07-20 16:37:27,828 WARN L193 SmtUtils]: Spent 501.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2020-07-20 16:37:28,317 WARN L193 SmtUtils]: Spent 481.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2020-07-20 16:37:28,784 WARN L193 SmtUtils]: Spent 460.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 16:37:29,237 WARN L193 SmtUtils]: Spent 447.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 16:37:29,661 WARN L193 SmtUtils]: Spent 418.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-20 16:37:30,115 WARN L193 SmtUtils]: Spent 446.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:37:30,503 WARN L193 SmtUtils]: Spent 376.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:37:30,881 WARN L193 SmtUtils]: Spent 372.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 16:37:31,221 WARN L193 SmtUtils]: Spent 333.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:37:31,552 WARN L193 SmtUtils]: Spent 325.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 16:37:31,859 WARN L193 SmtUtils]: Spent 300.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:37:32,147 WARN L193 SmtUtils]: Spent 281.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:37:32,418 WARN L193 SmtUtils]: Spent 264.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:37:32,669 WARN L193 SmtUtils]: Spent 245.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:37:33,039 WARN L193 SmtUtils]: Spent 363.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:37:33,392 WARN L193 SmtUtils]: Spent 346.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2020-07-20 16:37:36,766 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:37:36,923 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:37:37,129 WARN L193 SmtUtils]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:37:37,340 WARN L193 SmtUtils]: Spent 204.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:37:37,609 WARN L193 SmtUtils]: Spent 262.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:37:37,869 WARN L193 SmtUtils]: Spent 254.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:37:38,195 WARN L193 SmtUtils]: Spent 319.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:37:38,518 WARN L193 SmtUtils]: Spent 316.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:37:38,907 WARN L193 SmtUtils]: Spent 382.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:37:39,297 WARN L193 SmtUtils]: Spent 382.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:37:39,757 WARN L193 SmtUtils]: Spent 451.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:37:40,210 WARN L193 SmtUtils]: Spent 445.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:37:40,700 WARN L193 SmtUtils]: Spent 483.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:37:41,204 WARN L193 SmtUtils]: Spent 499.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:37:41,711 WARN L193 SmtUtils]: Spent 497.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 16:37:42,204 WARN L193 SmtUtils]: Spent 487.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 16:37:42,676 WARN L193 SmtUtils]: Spent 464.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-20 16:37:43,152 WARN L193 SmtUtils]: Spent 470.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:37:43,585 WARN L193 SmtUtils]: Spent 426.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 16:37:43,981 WARN L193 SmtUtils]: Spent 389.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-20 16:37:44,378 WARN L193 SmtUtils]: Spent 391.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 16:37:44,748 WARN L193 SmtUtils]: Spent 363.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 16:37:45,093 WARN L193 SmtUtils]: Spent 338.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 16:37:45,422 WARN L193 SmtUtils]: Spent 322.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 16:37:45,722 WARN L193 SmtUtils]: Spent 292.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:37:46,016 WARN L193 SmtUtils]: Spent 287.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:37:46,289 WARN L193 SmtUtils]: Spent 266.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-20 16:37:46,543 WARN L193 SmtUtils]: Spent 248.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 16:37:46,778 WARN L193 SmtUtils]: Spent 229.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 16:37:46,991 WARN L193 SmtUtils]: Spent 207.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2020-07-20 16:37:47,465 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [399129437] [2020-07-20 16:37:47,465 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 16:37:47,465 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-07-20 16:37:47,465 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [849901469] [2020-07-20 16:37:47,466 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 16:37:47,466 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:37:47,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 16:37:47,467 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=317, Unknown=13, NotChecked=0, Total=380 [2020-07-20 16:37:47,467 INFO L87 Difference]: Start difference. First operand 53 states and 67 transitions. Second operand 15 states. [2020-07-20 16:38:14,559 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2020-07-20 16:38:29,837 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 16:38:40,893 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 16:38:52,436 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2020-07-20 16:39:01,793 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2020-07-20 16:39:09,137 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-07-20 16:39:19,854 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-07-20 16:39:22,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:39:22,250 INFO L93 Difference]: Finished difference Result 65 states and 82 transitions. [2020-07-20 16:39:22,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 16:39:22,273 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 48 [2020-07-20 16:39:22,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:39:22,274 INFO L225 Difference]: With dead ends: 65 [2020-07-20 16:39:22,275 INFO L226 Difference]: Without dead ends: 61 [2020-07-20 16:39:22,276 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 81.7s TimeCoverageRelationStatistics Valid=112, Invalid=667, Unknown=33, NotChecked=0, Total=812 [2020-07-20 16:39:22,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-20 16:39:22,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-07-20 16:39:22,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-07-20 16:39:22,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 74 transitions. [2020-07-20 16:39:22,285 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 74 transitions. Word has length 48 [2020-07-20 16:39:22,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:39:22,286 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 74 transitions. [2020-07-20 16:39:22,286 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 16:39:22,286 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 74 transitions. [2020-07-20 16:39:22,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-07-20 16:39:22,287 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:39:22,288 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:39:22,501 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:39:22,502 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:39:22,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:39:22,503 INFO L82 PathProgramCache]: Analyzing trace with hash -692522583, now seen corresponding path program 8 times [2020-07-20 16:39:22,503 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:39:22,504 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [912969593] [2020-07-20 16:39:22,504 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:39:22,623 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:39:22,623 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:39:22,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-20 16:39:22,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:39:23,315 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2020-07-20 16:39:36,380 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 18 proven. 20 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2020-07-20 16:39:36,381 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:39:37,588 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2020-07-20 16:39:37,709 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2020-07-20 16:39:37,896 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:39:38,085 WARN L193 SmtUtils]: Spent 182.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:39:38,350 WARN L193 SmtUtils]: Spent 249.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:39:38,602 WARN L193 SmtUtils]: Spent 245.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:39:38,943 WARN L193 SmtUtils]: Spent 332.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:39:39,268 WARN L193 SmtUtils]: Spent 318.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:39:39,665 WARN L193 SmtUtils]: Spent 386.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:39:40,058 WARN L193 SmtUtils]: Spent 385.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:39:40,519 WARN L193 SmtUtils]: Spent 453.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:39:40,982 WARN L193 SmtUtils]: Spent 456.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:39:41,497 WARN L193 SmtUtils]: Spent 505.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 16:39:42,015 WARN L193 SmtUtils]: Spent 511.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 16:39:42,573 WARN L193 SmtUtils]: Spent 549.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:39:43,134 WARN L193 SmtUtils]: Spent 552.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:39:43,742 WARN L193 SmtUtils]: Spent 598.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 16:39:44,360 WARN L193 SmtUtils]: Spent 610.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 16:39:45,013 WARN L193 SmtUtils]: Spent 643.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:39:45,668 WARN L193 SmtUtils]: Spent 648.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:39:46,329 WARN L193 SmtUtils]: Spent 648.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-20 16:39:46,962 WARN L193 SmtUtils]: Spent 625.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-20 16:39:47,567 WARN L193 SmtUtils]: Spent 597.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 16:39:48,152 WARN L193 SmtUtils]: Spent 575.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-20 16:39:48,714 WARN L193 SmtUtils]: Spent 555.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 16:39:49,251 WARN L193 SmtUtils]: Spent 528.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 16:39:49,761 WARN L193 SmtUtils]: Spent 502.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:39:50,243 WARN L193 SmtUtils]: Spent 474.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 16:39:50,705 WARN L193 SmtUtils]: Spent 455.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 16:39:51,149 WARN L193 SmtUtils]: Spent 435.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 16:39:51,568 WARN L193 SmtUtils]: Spent 411.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 16:39:51,967 WARN L193 SmtUtils]: Spent 392.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:39:52,339 WARN L193 SmtUtils]: Spent 365.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:39:52,684 WARN L193 SmtUtils]: Spent 338.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 16:39:53,009 WARN L193 SmtUtils]: Spent 317.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 16:39:53,312 WARN L193 SmtUtils]: Spent 295.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:39:53,723 WARN L193 SmtUtils]: Spent 402.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 16:39:54,102 WARN L193 SmtUtils]: Spent 371.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2020-07-20 16:39:55,289 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2020-07-20 16:39:55,409 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2020-07-20 16:39:55,598 WARN L193 SmtUtils]: Spent 182.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:39:55,787 WARN L193 SmtUtils]: Spent 182.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:39:56,048 WARN L193 SmtUtils]: Spent 253.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:39:56,305 WARN L193 SmtUtils]: Spent 249.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:39:56,630 WARN L193 SmtUtils]: Spent 316.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:39:56,954 WARN L193 SmtUtils]: Spent 316.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:39:57,350 WARN L193 SmtUtils]: Spent 387.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:39:57,747 WARN L193 SmtUtils]: Spent 388.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:39:58,218 WARN L193 SmtUtils]: Spent 463.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:39:58,683 WARN L193 SmtUtils]: Spent 457.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:39:59,195 WARN L193 SmtUtils]: Spent 502.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 16:39:59,710 WARN L193 SmtUtils]: Spent 507.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 16:40:00,268 WARN L193 SmtUtils]: Spent 549.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:40:00,832 WARN L193 SmtUtils]: Spent 556.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:40:01,401 WARN L193 SmtUtils]: Spent 558.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-20 16:40:01,951 WARN L193 SmtUtils]: Spent 542.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:40:02,471 WARN L193 SmtUtils]: Spent 512.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 16:40:02,968 WARN L193 SmtUtils]: Spent 490.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-20 16:40:03,450 WARN L193 SmtUtils]: Spent 475.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-20 16:40:03,904 WARN L193 SmtUtils]: Spent 446.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:40:04,337 WARN L193 SmtUtils]: Spent 425.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:40:04,734 WARN L193 SmtUtils]: Spent 389.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 16:40:05,115 WARN L193 SmtUtils]: Spent 374.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 16:40:05,471 WARN L193 SmtUtils]: Spent 348.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 16:40:05,815 WARN L193 SmtUtils]: Spent 337.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2020-07-20 16:40:06,131 WARN L193 SmtUtils]: Spent 308.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 16:40:06,416 WARN L193 SmtUtils]: Spent 278.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 16:40:06,811 WARN L193 SmtUtils]: Spent 387.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-20 16:40:07,648 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [912969593] [2020-07-20 16:40:07,649 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 16:40:07,649 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-07-20 16:40:07,649 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [461753732] [2020-07-20 16:40:07,650 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:40:07,650 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:40:07,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:40:07,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=291, Unknown=5, NotChecked=0, Total=342 [2020-07-20 16:40:07,651 INFO L87 Difference]: Start difference. First operand 58 states and 74 transitions. Second operand 14 states. [2020-07-20 16:40:15,017 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2020-07-20 16:40:30,552 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 16:40:39,524 WARN L193 SmtUtils]: Spent 182.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2020-07-20 16:40:48,796 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 16:40:58,855 WARN L193 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 16:41:04,692 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-07-20 16:41:12,715 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-07-20 16:41:17,017 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-07-20 16:41:20,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:41:20,226 INFO L93 Difference]: Finished difference Result 65 states and 82 transitions. [2020-07-20 16:41:20,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:41:20,249 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 48 [2020-07-20 16:41:20,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:41:20,250 INFO L225 Difference]: With dead ends: 65 [2020-07-20 16:41:20,250 INFO L226 Difference]: Without dead ends: 61 [2020-07-20 16:41:20,250 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 44.4s TimeCoverageRelationStatistics Valid=100, Invalid=586, Unknown=16, NotChecked=0, Total=702 [2020-07-20 16:41:20,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-20 16:41:20,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 56. [2020-07-20 16:41:20,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 16:41:20,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 71 transitions. [2020-07-20 16:41:20,259 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 71 transitions. Word has length 48 [2020-07-20 16:41:20,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:41:20,260 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 71 transitions. [2020-07-20 16:41:20,260 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:41:20,260 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 71 transitions. [2020-07-20 16:41:20,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-07-20 16:41:20,261 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:41:20,262 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:41:20,465 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:41:20,467 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:41:20,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:41:20,468 INFO L82 PathProgramCache]: Analyzing trace with hash 1570146377, now seen corresponding path program 9 times [2020-07-20 16:41:20,468 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:41:20,468 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [327857541] [2020-07-20 16:41:20,469 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:41:20,600 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:41:20,601 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:41:20,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-20 16:41:20,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:41:21,376 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2020-07-20 16:41:23,671 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 16:41:26,377 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 16:41:26,815 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 16:41:27,319 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 16:41:29,235 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 11 proven. 23 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-20 16:41:29,235 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:41:32,405 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2020-07-20 16:41:32,554 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2020-07-20 16:41:32,782 WARN L193 SmtUtils]: Spent 219.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:41:33,020 WARN L193 SmtUtils]: Spent 228.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:41:33,324 WARN L193 SmtUtils]: Spent 295.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:41:33,624 WARN L193 SmtUtils]: Spent 291.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:41:34,006 WARN L193 SmtUtils]: Spent 373.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:41:34,369 WARN L193 SmtUtils]: Spent 353.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:41:34,814 WARN L193 SmtUtils]: Spent 435.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:41:35,249 WARN L193 SmtUtils]: Spent 426.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:41:35,761 WARN L193 SmtUtils]: Spent 502.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:41:36,280 WARN L193 SmtUtils]: Spent 511.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:41:36,880 WARN L193 SmtUtils]: Spent 589.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:41:37,480 WARN L193 SmtUtils]: Spent 592.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:41:38,154 WARN L193 SmtUtils]: Spent 664.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:41:38,794 WARN L193 SmtUtils]: Spent 631.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:41:39,338 WARN L193 SmtUtils]: Spent 537.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 16:41:40,061 WARN L193 SmtUtils]: Spent 715.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 16:41:40,837 WARN L193 SmtUtils]: Spent 766.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:41:41,598 WARN L193 SmtUtils]: Spent 753.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:41:42,399 WARN L193 SmtUtils]: Spent 787.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-20 16:41:43,164 WARN L193 SmtUtils]: Spent 756.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2020-07-20 16:41:43,892 WARN L193 SmtUtils]: Spent 720.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-20 16:41:44,601 WARN L193 SmtUtils]: Spent 699.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-20 16:41:45,278 WARN L193 SmtUtils]: Spent 669.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2020-07-20 16:41:45,925 WARN L193 SmtUtils]: Spent 638.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2020-07-20 16:41:46,548 WARN L193 SmtUtils]: Spent 615.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:41:47,140 WARN L193 SmtUtils]: Spent 584.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 16:41:47,717 WARN L193 SmtUtils]: Spent 569.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-20 16:41:48,259 WARN L193 SmtUtils]: Spent 534.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-20 16:41:48,778 WARN L193 SmtUtils]: Spent 511.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:41:49,270 WARN L193 SmtUtils]: Spent 483.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 16:41:49,741 WARN L193 SmtUtils]: Spent 463.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:41:50,182 WARN L193 SmtUtils]: Spent 432.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 16:41:50,598 WARN L193 SmtUtils]: Spent 408.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:41:50,986 WARN L193 SmtUtils]: Spent 380.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 16:41:51,339 WARN L193 SmtUtils]: Spent 345.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-20 16:41:51,689 WARN L193 SmtUtils]: Spent 340.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 16:41:52,000 WARN L193 SmtUtils]: Spent 302.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 16:41:52,284 WARN L193 SmtUtils]: Spent 275.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2020-07-20 16:41:53,517 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2020-07-20 16:41:53,650 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2020-07-20 16:41:53,863 WARN L193 SmtUtils]: Spent 205.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:41:54,071 WARN L193 SmtUtils]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:41:54,371 WARN L193 SmtUtils]: Spent 290.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:41:54,662 WARN L193 SmtUtils]: Spent 283.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:41:55,024 WARN L193 SmtUtils]: Spent 353.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:41:55,384 WARN L193 SmtUtils]: Spent 352.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:41:55,823 WARN L193 SmtUtils]: Spent 429.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:41:56,262 WARN L193 SmtUtils]: Spent 430.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:41:56,780 WARN L193 SmtUtils]: Spent 509.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:41:57,299 WARN L193 SmtUtils]: Spent 509.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:41:57,900 WARN L193 SmtUtils]: Spent 591.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:41:58,491 WARN L193 SmtUtils]: Spent 583.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 16:41:59,174 WARN L193 SmtUtils]: Spent 673.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:41:59,856 WARN L193 SmtUtils]: Spent 673.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:42:00,540 WARN L193 SmtUtils]: Spent 672.00 ms on a formula simplification that was a NOOP. DAG size: 79 [2020-07-20 16:42:01,193 WARN L193 SmtUtils]: Spent 645.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2020-07-20 16:42:01,813 WARN L193 SmtUtils]: Spent 611.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-20 16:42:02,419 WARN L193 SmtUtils]: Spent 598.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 16:42:02,985 WARN L193 SmtUtils]: Spent 557.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 16:42:03,528 WARN L193 SmtUtils]: Spent 534.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-20 16:42:04,044 WARN L193 SmtUtils]: Spent 508.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:42:04,532 WARN L193 SmtUtils]: Spent 480.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 16:42:05,002 WARN L193 SmtUtils]: Spent 461.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-20 16:42:05,452 WARN L193 SmtUtils]: Spent 442.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 16:42:05,869 WARN L193 SmtUtils]: Spent 408.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 16:42:06,266 WARN L193 SmtUtils]: Spent 388.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:42:06,630 WARN L193 SmtUtils]: Spent 355.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-20 16:42:06,974 WARN L193 SmtUtils]: Spent 336.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:42:07,286 WARN L193 SmtUtils]: Spent 304.00 ms on a formula simplification that was a NOOP. DAG size: 33 [2020-07-20 16:42:07,575 WARN L193 SmtUtils]: Spent 281.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:42:08,193 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [327857541] [2020-07-20 16:42:08,193 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 16:42:08,194 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-07-20 16:42:08,194 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [545528303] [2020-07-20 16:42:08,194 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 16:42:08,195 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:42:08,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 16:42:08,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=329, Unknown=3, NotChecked=0, Total=380 [2020-07-20 16:42:08,195 INFO L87 Difference]: Start difference. First operand 56 states and 71 transitions. Second operand 15 states. [2020-07-20 16:42:11,355 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2020-07-20 16:42:18,879 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 16:42:23,833 WARN L193 SmtUtils]: Spent 195.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2020-07-20 16:42:28,877 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 16:42:34,062 WARN L193 SmtUtils]: Spent 208.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 16:42:34,973 WARN L193 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2020-07-20 16:42:36,144 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2020-07-20 16:42:37,327 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:42:38,025 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:42:39,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:42:39,164 INFO L93 Difference]: Finished difference Result 69 states and 87 transitions. [2020-07-20 16:42:39,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 16:42:39,183 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 48 [2020-07-20 16:42:39,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:42:39,184 INFO L225 Difference]: With dead ends: 69 [2020-07-20 16:42:39,184 INFO L226 Difference]: Without dead ends: 65 [2020-07-20 16:42:39,185 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 30.0s TimeCoverageRelationStatistics Valid=108, Invalid=695, Unknown=9, NotChecked=0, Total=812 [2020-07-20 16:42:39,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-07-20 16:42:39,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 59. [2020-07-20 16:42:39,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-07-20 16:42:39,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 75 transitions. [2020-07-20 16:42:39,190 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 75 transitions. Word has length 48 [2020-07-20 16:42:39,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:42:39,190 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 75 transitions. [2020-07-20 16:42:39,191 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 16:42:39,191 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 75 transitions. [2020-07-20 16:42:39,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-07-20 16:42:39,192 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:42:39,192 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:42:39,397 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:42:39,398 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:42:39,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:42:39,398 INFO L82 PathProgramCache]: Analyzing trace with hash 855120905, now seen corresponding path program 10 times [2020-07-20 16:42:39,399 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:42:39,399 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1647664411] [2020-07-20 16:42:39,399 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:42:39,541 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:42:39,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:42:39,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-20 16:42:39,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:42:40,341 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2020-07-20 16:42:42,664 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 16:42:45,028 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-20 16:43:09,821 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 18 proven. 21 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2020-07-20 16:43:09,822 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 16:43:13,026 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2020-07-20 16:43:13,166 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2020-07-20 16:43:13,390 WARN L193 SmtUtils]: Spent 215.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:43:13,614 WARN L193 SmtUtils]: Spent 214.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:43:13,926 WARN L193 SmtUtils]: Spent 303.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:43:14,233 WARN L193 SmtUtils]: Spent 298.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:43:14,628 WARN L193 SmtUtils]: Spent 385.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:43:15,009 WARN L193 SmtUtils]: Spent 373.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:43:15,471 WARN L193 SmtUtils]: Spent 451.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:43:15,969 WARN L193 SmtUtils]: Spent 488.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:43:16,527 WARN L193 SmtUtils]: Spent 548.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:43:17,139 WARN L193 SmtUtils]: Spent 604.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:43:17,803 WARN L193 SmtUtils]: Spent 648.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 16:43:18,395 WARN L193 SmtUtils]: Spent 583.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 16:43:19,054 WARN L193 SmtUtils]: Spent 648.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:43:19,717 WARN L193 SmtUtils]: Spent 654.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:43:20,422 WARN L193 SmtUtils]: Spent 695.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 16:43:21,130 WARN L193 SmtUtils]: Spent 699.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 16:43:21,903 WARN L193 SmtUtils]: Spent 762.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:43:22,673 WARN L193 SmtUtils]: Spent 762.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:43:23,456 WARN L193 SmtUtils]: Spent 771.00 ms on a formula simplification that was a NOOP. DAG size: 83 [2020-07-20 16:43:24,208 WARN L193 SmtUtils]: Spent 742.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2020-07-20 16:43:24,808 WARN L193 SmtUtils]: Spent 593.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-20 16:43:25,331 WARN L193 SmtUtils]: Spent 517.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2020-07-20 16:43:25,987 WARN L193 SmtUtils]: Spent 646.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 16:43:26,615 WARN L193 SmtUtils]: Spent 619.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 16:43:27,225 WARN L193 SmtUtils]: Spent 602.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 16:43:27,796 WARN L193 SmtUtils]: Spent 563.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:43:28,347 WARN L193 SmtUtils]: Spent 542.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 16:43:28,978 WARN L193 SmtUtils]: Spent 618.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 16:43:29,468 WARN L193 SmtUtils]: Spent 482.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 16:43:29,924 WARN L193 SmtUtils]: Spent 447.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-20 16:43:30,514 WARN L193 SmtUtils]: Spent 581.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:43:31,076 WARN L193 SmtUtils]: Spent 553.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 16:43:31,626 WARN L193 SmtUtils]: Spent 541.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 16:43:32,245 WARN L193 SmtUtils]: Spent 609.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:43:32,757 WARN L193 SmtUtils]: Spent 503.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2020-07-20 16:43:33,213 WARN L193 SmtUtils]: Spent 448.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:43:38,488 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2020-07-20 16:43:38,630 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2020-07-20 16:43:38,927 WARN L193 SmtUtils]: Spent 288.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:43:39,150 WARN L193 SmtUtils]: Spent 214.00 ms on a formula simplification that was a NOOP. DAG size: 17 [2020-07-20 16:43:39,459 WARN L193 SmtUtils]: Spent 299.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:43:39,763 WARN L193 SmtUtils]: Spent 296.00 ms on a formula simplification that was a NOOP. DAG size: 23 [2020-07-20 16:43:40,156 WARN L193 SmtUtils]: Spent 384.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:43:40,546 WARN L193 SmtUtils]: Spent 382.00 ms on a formula simplification that was a NOOP. DAG size: 30 [2020-07-20 16:43:41,073 WARN L193 SmtUtils]: Spent 516.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:43:41,748 WARN L193 SmtUtils]: Spent 662.00 ms on a formula simplification that was a NOOP. DAG size: 36 [2020-07-20 16:43:42,545 WARN L193 SmtUtils]: Spent 783.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:43:43,147 WARN L193 SmtUtils]: Spent 588.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-20 16:43:43,747 WARN L193 SmtUtils]: Spent 589.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 16:43:44,344 WARN L193 SmtUtils]: Spent 588.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-20 16:43:44,989 WARN L193 SmtUtils]: Spent 635.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:43:45,634 WARN L193 SmtUtils]: Spent 636.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:43:46,288 WARN L193 SmtUtils]: Spent 643.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-20 16:43:46,921 WARN L193 SmtUtils]: Spent 624.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 16:43:47,522 WARN L193 SmtUtils]: Spent 592.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-20 16:43:48,098 WARN L193 SmtUtils]: Spent 567.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 16:43:48,650 WARN L193 SmtUtils]: Spent 543.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-20 16:43:49,163 WARN L193 SmtUtils]: Spent 504.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 16:43:49,655 WARN L193 SmtUtils]: Spent 483.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 16:43:50,115 WARN L193 SmtUtils]: Spent 451.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-20 16:43:50,549 WARN L193 SmtUtils]: Spent 425.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-20 16:43:50,958 WARN L193 SmtUtils]: Spent 400.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 16:43:51,346 WARN L193 SmtUtils]: Spent 379.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2020-07-20 16:43:51,702 WARN L193 SmtUtils]: Spent 347.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 16:43:52,025 WARN L193 SmtUtils]: Spent 314.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-20 16:43:52,332 WARN L193 SmtUtils]: Spent 299.00 ms on a formula simplification that was a NOOP. DAG size: 27 [2020-07-20 16:43:54,942 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1647664411] [2020-07-20 16:43:54,942 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-20 16:43:54,943 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-07-20 16:43:54,943 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060671792] [2020-07-20 16:43:54,943 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 16:43:54,943 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 16:43:54,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 16:43:54,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=280, Unknown=15, NotChecked=0, Total=342 [2020-07-20 16:43:54,944 INFO L87 Difference]: Start difference. First operand 59 states and 75 transitions. Second operand 14 states. [2020-07-20 16:44:08,451 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 10 [2020-07-20 16:44:30,245 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2020-07-20 16:44:41,538 WARN L193 SmtUtils]: Spent 336.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2020-07-20 16:44:54,691 WARN L193 SmtUtils]: Spent 222.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 16:45:12,054 WARN L193 SmtUtils]: Spent 241.00 ms on a formula simplification that was a NOOP. DAG size: 19 [2020-07-20 16:45:20,913 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 20 [2020-07-20 16:45:29,533 WARN L193 SmtUtils]: Spent 2.14 s on a formula simplification that was a NOOP. DAG size: 20 [2020-07-20 16:45:32,103 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2020-07-20 16:45:39,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 16:45:39,942 INFO L93 Difference]: Finished difference Result 69 states and 87 transitions. [2020-07-20 16:45:39,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 16:45:39,966 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 48 [2020-07-20 16:45:39,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 16:45:39,967 INFO L225 Difference]: With dead ends: 69 [2020-07-20 16:45:39,967 INFO L226 Difference]: Without dead ends: 65 [2020-07-20 16:45:39,968 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 75.1s TimeCoverageRelationStatistics Valid=102, Invalid=575, Unknown=25, NotChecked=0, Total=702 [2020-07-20 16:45:39,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-07-20 16:45:39,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 60. [2020-07-20 16:45:39,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 16:45:39,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 76 transitions. [2020-07-20 16:45:39,973 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 76 transitions. Word has length 48 [2020-07-20 16:45:39,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 16:45:39,973 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 76 transitions. [2020-07-20 16:45:39,974 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 16:45:39,974 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 76 transitions. [2020-07-20 16:45:39,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-07-20 16:45:39,975 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 16:45:39,975 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 16:45:40,176 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:45:40,177 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 16:45:40,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 16:45:40,177 INFO L82 PathProgramCache]: Analyzing trace with hash -984021079, now seen corresponding path program 11 times [2020-07-20 16:45:40,178 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 16:45:40,178 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [263389894] [2020-07-20 16:45:40,178 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 16:45:40,323 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 16:45:40,323 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 16:45:40,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-20 16:45:40,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 16:45:45,236 WARN L193 SmtUtils]: Spent 2.09 s on a formula simplification that was a NOOP. DAG size: 15