/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 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-invgen/fragtest_simple.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:56:10,835 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:56:10,839 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:56:10,857 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:56:10,857 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:56:10,860 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:56:10,862 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:56:10,872 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:56:10,876 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:56:10,879 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:56:10,881 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:56:10,882 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:56:10,882 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:56:10,884 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:56:10,887 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:56:10,888 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:56:10,890 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:56:10,890 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:56:10,892 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:56:10,897 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:56:10,902 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:56:10,907 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:56:10,908 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:56:10,909 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:56:10,912 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 16:56:10,923 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:56:10,924 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:56:10,925 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:56:10,926 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 16:56:10,962 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:56:10,962 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:56:10,963 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:56:10,967 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:56:10,967 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:56:10,967 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:56:10,967 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:56:10,967 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:56:10,968 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:56:10,968 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:56:10,968 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:56:10,968 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:56:10,968 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:56:10,969 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:56:10,969 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:56:10,969 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:56:10,969 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:56:10,969 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:56:10,970 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:56:10,970 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:56:10,970 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:56:10,970 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:56:10,971 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:56:10,971 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:56:10,971 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:56:10,971 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:56:10,971 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:10,972 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:56:10,972 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:56:10,972 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 -> 2 [2020-07-21 16:56:11,241 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:56:11,257 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:56:11,260 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:56:11,262 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:56:11,265 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:56:11,266 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/fragtest_simple.i [2020-07-21 16:56:11,342 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/598926129/97b9679756744737b00f5ccfde91b26a/FLAG9e7ad82c5 [2020-07-21 16:56:11,805 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:56:11,806 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/fragtest_simple.i [2020-07-21 16:56:11,812 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/598926129/97b9679756744737b00f5ccfde91b26a/FLAG9e7ad82c5 [2020-07-21 16:56:12,301 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/598926129/97b9679756744737b00f5ccfde91b26a [2020-07-21 16:56:12,317 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:56:12,321 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:56:12,323 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:56:12,323 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:56:12,326 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:56:12,327 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:56:12" (1/1) ... [2020-07-21 16:56:12,330 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3b9f221d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:56:12, skipping insertion in model container [2020-07-21 16:56:12,330 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:56:12" (1/1) ... [2020-07-21 16:56:12,339 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:56:12,357 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:56:12,519 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:56:12,523 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:56:12,543 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:56:12,559 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:56:12,559 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:56:12 WrapperNode [2020-07-21 16:56:12,560 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:56:12,560 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:56:12,560 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:56:12,561 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:56:12,574 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:56:12" (1/1) ... [2020-07-21 16:56:12,575 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:56:12" (1/1) ... [2020-07-21 16:56:12,580 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:56:12" (1/1) ... [2020-07-21 16:56:12,580 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:56:12" (1/1) ... [2020-07-21 16:56:12,668 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:56:12" (1/1) ... [2020-07-21 16:56:12,675 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:56:12" (1/1) ... [2020-07-21 16:56:12,676 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:56:12" (1/1) ... [2020-07-21 16:56:12,678 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:56:12,678 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:56:12,678 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:56:12,679 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:56:12,680 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:56:12" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:56:12,745 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:56:12,745 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:56:12,745 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 16:56:12,745 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 16:56:12,745 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:56:12,746 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:56:12,746 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 16:56:12,746 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 16:56:12,746 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 16:56:12,746 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 16:56:12,746 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:56:12,747 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:56:12,747 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:56:12,956 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:56:12,956 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-21 16:56:12,960 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:56:12 BoogieIcfgContainer [2020-07-21 16:56:12,960 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:56:12,961 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:56:12,961 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:56:12,964 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:56:12,965 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:56:12" (1/3) ... [2020-07-21 16:56:12,966 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@583e79ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:56:12, skipping insertion in model container [2020-07-21 16:56:12,966 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:56:12" (2/3) ... [2020-07-21 16:56:12,966 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@583e79ca and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:56:12, skipping insertion in model container [2020-07-21 16:56:12,966 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:56:12" (3/3) ... [2020-07-21 16:56:12,968 INFO L109 eAbstractionObserver]: Analyzing ICFG fragtest_simple.i [2020-07-21 16:56:12,979 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:56:12,985 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:56:12,996 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:56:13,018 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:56:13,019 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:56:13,019 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:56:13,019 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:56:13,019 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:56:13,019 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:56:13,019 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:56:13,020 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:56:13,035 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2020-07-21 16:56:13,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-21 16:56:13,040 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:13,041 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:13,042 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:13,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:13,046 INFO L82 PathProgramCache]: Analyzing trace with hash 317368997, now seen corresponding path program 1 times [2020-07-21 16:56:13,053 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:13,054 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [510291865] [2020-07-21 16:56:13,054 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:13,156 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:13,156 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:13,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 16:56:13,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:13,199 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:56:13,199 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:56:13,200 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [510291865] [2020-07-21 16:56:13,201 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:56:13,211 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 16:56:13,213 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [641594835] [2020-07-21 16:56:13,218 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 16:56:13,219 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:13,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 16:56:13,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 16:56:13,233 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2020-07-21 16:56:13,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:13,254 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2020-07-21 16:56:13,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 16:56:13,255 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2020-07-21 16:56:13,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:13,262 INFO L225 Difference]: With dead ends: 47 [2020-07-21 16:56:13,263 INFO L226 Difference]: Without dead ends: 22 [2020-07-21 16:56:13,266 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 16:56:13,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-07-21 16:56:13,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-07-21 16:56:13,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-07-21 16:56:13,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2020-07-21 16:56:13,300 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 15 [2020-07-21 16:56:13,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:13,301 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2020-07-21 16:56:13,301 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 16:56:13,301 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2020-07-21 16:56:13,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 16:56:13,302 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:13,302 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:13,517 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:13,517 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:13,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:13,519 INFO L82 PathProgramCache]: Analyzing trace with hash 1632722591, now seen corresponding path program 1 times [2020-07-21 16:56:13,519 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:13,520 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [613826599] [2020-07-21 16:56:13,521 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:13,557 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:13,557 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:13,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 16:56:13,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:13,595 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:56:13,630 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:56:13,633 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:56:13,633 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [613826599] [2020-07-21 16:56:13,634 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:56:13,634 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:56:13,634 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194440642] [2020-07-21 16:56:13,636 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:56:13,637 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:13,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:56:13,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:56:13,638 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 5 states. [2020-07-21 16:56:13,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:13,709 INFO L93 Difference]: Finished difference Result 31 states and 34 transitions. [2020-07-21 16:56:13,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:56:13,710 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-07-21 16:56:13,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:13,712 INFO L225 Difference]: With dead ends: 31 [2020-07-21 16:56:13,712 INFO L226 Difference]: Without dead ends: 29 [2020-07-21 16:56:13,713 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 16:56:13,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-21 16:56:13,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2020-07-21 16:56:13,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 16:56:13,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2020-07-21 16:56:13,723 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 17 [2020-07-21 16:56:13,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:13,723 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2020-07-21 16:56:13,723 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:56:13,724 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2020-07-21 16:56:13,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 16:56:13,725 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:13,725 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, 1] [2020-07-21 16:56:13,938 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:13,939 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:13,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:13,941 INFO L82 PathProgramCache]: Analyzing trace with hash -1401298672, now seen corresponding path program 1 times [2020-07-21 16:56:13,942 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:13,943 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [458218973] [2020-07-21 16:56:13,943 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:13,994 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:13,994 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:13,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 16:56:14,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:14,060 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:56:14,060 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:56:14,061 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [458218973] [2020-07-21 16:56:14,061 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:56:14,061 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:56:14,062 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733404160] [2020-07-21 16:56:14,063 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:56:14,063 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:14,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:56:14,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:56:14,064 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 5 states. [2020-07-21 16:56:14,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:14,155 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2020-07-21 16:56:14,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:56:14,156 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 25 [2020-07-21 16:56:14,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:14,160 INFO L225 Difference]: With dead ends: 49 [2020-07-21 16:56:14,160 INFO L226 Difference]: Without dead ends: 34 [2020-07-21 16:56:14,161 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-07-21 16:56:14,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-07-21 16:56:14,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2020-07-21 16:56:14,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 16:56:14,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 33 transitions. [2020-07-21 16:56:14,172 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 33 transitions. Word has length 25 [2020-07-21 16:56:14,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:14,173 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 33 transitions. [2020-07-21 16:56:14,173 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:56:14,173 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 33 transitions. [2020-07-21 16:56:14,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 16:56:14,177 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:14,177 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:14,391 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:14,392 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:14,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:14,393 INFO L82 PathProgramCache]: Analyzing trace with hash 1107622837, now seen corresponding path program 1 times [2020-07-21 16:56:14,394 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:14,395 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [418758248] [2020-07-21 16:56:14,395 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:14,436 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:14,436 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:14,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:56:14,443 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:14,499 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:56:14,500 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:14,568 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:56:14,569 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [418758248] [2020-07-21 16:56:14,570 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:14,570 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-07-21 16:56:14,570 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390184104] [2020-07-21 16:56:14,571 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 16:56:14,571 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:14,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 16:56:14,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-21 16:56:14,572 INFO L87 Difference]: Start difference. First operand 30 states and 33 transitions. Second operand 8 states. [2020-07-21 16:56:14,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:14,711 INFO L93 Difference]: Finished difference Result 55 states and 64 transitions. [2020-07-21 16:56:14,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 16:56:14,713 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 27 [2020-07-21 16:56:14,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:14,716 INFO L225 Difference]: With dead ends: 55 [2020-07-21 16:56:14,716 INFO L226 Difference]: Without dead ends: 40 [2020-07-21 16:56:14,717 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 45 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2020-07-21 16:56:14,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-07-21 16:56:14,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 32. [2020-07-21 16:56:14,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-21 16:56:14,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2020-07-21 16:56:14,732 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 27 [2020-07-21 16:56:14,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:14,732 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2020-07-21 16:56:14,733 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 16:56:14,733 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2020-07-21 16:56:14,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 16:56:14,734 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:14,734 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:14,948 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:14,949 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:14,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:14,950 INFO L82 PathProgramCache]: Analyzing trace with hash -1590427366, now seen corresponding path program 2 times [2020-07-21 16:56:14,950 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:14,951 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1174141258] [2020-07-21 16:56:14,951 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:14,986 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:14,986 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:14,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 16:56:14,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:15,014 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:56:15,033 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:56:15,034 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:15,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:56:15,082 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:56:15,082 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1174141258] [2020-07-21 16:56:15,083 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:15,083 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-07-21 16:56:15,083 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569200973] [2020-07-21 16:56:15,084 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 16:56:15,084 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:15,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 16:56:15,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-07-21 16:56:15,085 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 8 states. [2020-07-21 16:56:15,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:15,157 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2020-07-21 16:56:15,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:56:15,157 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 29 [2020-07-21 16:56:15,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:15,159 INFO L225 Difference]: With dead ends: 51 [2020-07-21 16:56:15,159 INFO L226 Difference]: Without dead ends: 49 [2020-07-21 16:56:15,160 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 47 SyntacticMatches, 4 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-07-21 16:56:15,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-07-21 16:56:15,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 44. [2020-07-21 16:56:15,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-21 16:56:15,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2020-07-21 16:56:15,169 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 29 [2020-07-21 16:56:15,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:15,169 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2020-07-21 16:56:15,169 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 16:56:15,170 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2020-07-21 16:56:15,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-21 16:56:15,172 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:15,172 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:15,387 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:15,388 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:15,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:15,388 INFO L82 PathProgramCache]: Analyzing trace with hash -30298372, now seen corresponding path program 3 times [2020-07-21 16:56:15,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:15,389 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1139446449] [2020-07-21 16:56:15,389 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:15,450 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:15,450 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:15,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:56:15,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:15,507 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 28 proven. 6 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-07-21 16:56:15,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:15,566 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 22 proven. 6 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-07-21 16:56:15,566 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1139446449] [2020-07-21 16:56:15,566 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:15,567 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2020-07-21 16:56:15,567 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1116964748] [2020-07-21 16:56:15,568 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 16:56:15,568 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:15,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 16:56:15,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-07-21 16:56:15,569 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 11 states. [2020-07-21 16:56:15,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:15,694 INFO L93 Difference]: Finished difference Result 83 states and 96 transitions. [2020-07-21 16:56:15,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:56:15,694 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 45 [2020-07-21 16:56:15,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:15,696 INFO L225 Difference]: With dead ends: 83 [2020-07-21 16:56:15,697 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 16:56:15,698 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 77 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:56:15,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 16:56:15,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 46. [2020-07-21 16:56:15,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 16:56:15,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-07-21 16:56:15,707 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 45 [2020-07-21 16:56:15,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:15,708 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-07-21 16:56:15,708 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 16:56:15,708 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-07-21 16:56:15,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-07-21 16:56:15,710 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:15,710 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:15,913 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:15,914 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:15,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:15,915 INFO L82 PathProgramCache]: Analyzing trace with hash 130155809, now seen corresponding path program 4 times [2020-07-21 16:56:15,915 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:15,916 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1745493363] [2020-07-21 16:56:15,917 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:15,972 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:15,972 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:15,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:56:15,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:16,076 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 24 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 16:56:16,077 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:16,175 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 24 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 16:56:16,176 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1745493363] [2020-07-21 16:56:16,176 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:16,176 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2020-07-21 16:56:16,176 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2033690457] [2020-07-21 16:56:16,177 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:56:16,177 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:16,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:56:16,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=129, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:56:16,178 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 14 states. [2020-07-21 16:56:16,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:16,373 INFO L93 Difference]: Finished difference Result 87 states and 103 transitions. [2020-07-21 16:56:16,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:56:16,373 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 47 [2020-07-21 16:56:16,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:16,377 INFO L225 Difference]: With dead ends: 87 [2020-07-21 16:56:16,377 INFO L226 Difference]: Without dead ends: 64 [2020-07-21 16:56:16,378 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 77 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:56:16,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-21 16:56:16,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 48. [2020-07-21 16:56:16,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-21 16:56:16,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2020-07-21 16:56:16,396 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 47 [2020-07-21 16:56:16,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:16,397 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2020-07-21 16:56:16,397 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:56:16,397 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2020-07-21 16:56:16,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-21 16:56:16,402 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:16,402 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:16,619 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:16,620 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:16,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:16,621 INFO L82 PathProgramCache]: Analyzing trace with hash -292198906, now seen corresponding path program 5 times [2020-07-21 16:56:16,621 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:16,622 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1414151312] [2020-07-21 16:56:16,622 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:16,660 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:16,660 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:16,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 16:56:16,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:16,726 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:56:16,744 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 26 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 16:56:16,744 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:16,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:56:16,828 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 26 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 16:56:16,828 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1414151312] [2020-07-21 16:56:16,828 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:16,829 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-07-21 16:56:16,829 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129577747] [2020-07-21 16:56:16,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 16:56:16,830 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:16,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 16:56:16,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-07-21 16:56:16,830 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand 10 states. [2020-07-21 16:56:16,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:16,936 INFO L93 Difference]: Finished difference Result 67 states and 73 transitions. [2020-07-21 16:56:16,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:56:16,937 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 49 [2020-07-21 16:56:16,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:16,939 INFO L225 Difference]: With dead ends: 67 [2020-07-21 16:56:16,939 INFO L226 Difference]: Without dead ends: 65 [2020-07-21 16:56:16,940 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 81 SyntacticMatches, 8 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 16:56:16,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-07-21 16:56:16,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 60. [2020-07-21 16:56:16,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 16:56:16,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 65 transitions. [2020-07-21 16:56:16,959 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 65 transitions. Word has length 49 [2020-07-21 16:56:16,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:16,960 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 65 transitions. [2020-07-21 16:56:16,960 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 16:56:16,960 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 65 transitions. [2020-07-21 16:56:16,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 16:56:16,964 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:16,964 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:17,178 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:17,179 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:17,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:17,180 INFO L82 PathProgramCache]: Analyzing trace with hash 551795688, now seen corresponding path program 6 times [2020-07-21 16:56:17,181 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:17,182 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1307542891] [2020-07-21 16:56:17,182 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:17,226 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:17,227 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:17,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:56:17,231 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:17,344 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 72 proven. 20 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-07-21 16:56:17,344 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:17,480 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 58 proven. 20 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2020-07-21 16:56:17,481 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1307542891] [2020-07-21 16:56:17,481 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:17,481 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 17 [2020-07-21 16:56:17,481 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [581118349] [2020-07-21 16:56:17,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:56:17,482 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:17,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:56:17,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=196, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:56:17,483 INFO L87 Difference]: Start difference. First operand 60 states and 65 transitions. Second operand 17 states. [2020-07-21 16:56:17,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:17,715 INFO L93 Difference]: Finished difference Result 115 states and 135 transitions. [2020-07-21 16:56:17,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:56:17,717 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 65 [2020-07-21 16:56:17,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:17,718 INFO L225 Difference]: With dead ends: 115 [2020-07-21 16:56:17,719 INFO L226 Difference]: Without dead ends: 82 [2020-07-21 16:56:17,720 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 109 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2020-07-21 16:56:17,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-07-21 16:56:17,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 62. [2020-07-21 16:56:17,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-07-21 16:56:17,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 67 transitions. [2020-07-21 16:56:17,731 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 67 transitions. Word has length 65 [2020-07-21 16:56:17,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:17,732 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 67 transitions. [2020-07-21 16:56:17,732 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:56:17,732 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 67 transitions. [2020-07-21 16:56:17,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 16:56:17,733 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:17,734 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:17,948 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:17,949 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:17,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:17,950 INFO L82 PathProgramCache]: Analyzing trace with hash -150434419, now seen corresponding path program 7 times [2020-07-21 16:56:17,950 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:17,951 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1474363263] [2020-07-21 16:56:17,951 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:17,994 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:17,994 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:17,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:56:17,998 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:18,147 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 60 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 16:56:18,148 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:18,297 INFO L134 CoverageAnalysis]: Checked inductivity of 130 backedges. 60 proven. 30 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 16:56:18,298 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1474363263] [2020-07-21 16:56:18,298 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:18,298 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 20 [2020-07-21 16:56:18,299 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [926815302] [2020-07-21 16:56:18,299 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:56:18,299 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:18,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:56:18,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:56:18,300 INFO L87 Difference]: Start difference. First operand 62 states and 67 transitions. Second operand 20 states. [2020-07-21 16:56:18,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:18,585 INFO L93 Difference]: Finished difference Result 119 states and 142 transitions. [2020-07-21 16:56:18,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 16:56:18,585 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 67 [2020-07-21 16:56:18,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:18,586 INFO L225 Difference]: With dead ends: 119 [2020-07-21 16:56:18,586 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 16:56:18,590 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 109 SyntacticMatches, 6 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2020-07-21 16:56:18,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 16:56:18,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 64. [2020-07-21 16:56:18,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-07-21 16:56:18,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 69 transitions. [2020-07-21 16:56:18,601 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 69 transitions. Word has length 67 [2020-07-21 16:56:18,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:18,602 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 69 transitions. [2020-07-21 16:56:18,602 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:56:18,602 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 69 transitions. [2020-07-21 16:56:18,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-21 16:56:18,603 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:18,606 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:18,807 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:18,808 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:18,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:18,809 INFO L82 PathProgramCache]: Analyzing trace with hash -683701774, now seen corresponding path program 8 times [2020-07-21 16:56:18,809 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:18,809 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1671956652] [2020-07-21 16:56:18,809 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:18,853 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:18,854 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:18,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 16:56:18,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:18,913 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:56:18,931 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 52 proven. 50 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 16:56:18,931 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:18,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:56:19,041 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 52 proven. 50 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 16:56:19,042 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1671956652] [2020-07-21 16:56:19,042 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:19,042 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-07-21 16:56:19,042 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902969609] [2020-07-21 16:56:19,043 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:56:19,043 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:19,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:56:19,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:56:19,044 INFO L87 Difference]: Start difference. First operand 64 states and 69 transitions. Second operand 12 states. [2020-07-21 16:56:19,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:19,139 INFO L93 Difference]: Finished difference Result 83 states and 90 transitions. [2020-07-21 16:56:19,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:56:19,140 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 69 [2020-07-21 16:56:19,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:19,142 INFO L225 Difference]: With dead ends: 83 [2020-07-21 16:56:19,142 INFO L226 Difference]: Without dead ends: 81 [2020-07-21 16:56:19,143 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 115 SyntacticMatches, 12 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=53, Invalid=103, Unknown=0, NotChecked=0, Total=156 [2020-07-21 16:56:19,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-21 16:56:19,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 76. [2020-07-21 16:56:19,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 16:56:19,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 82 transitions. [2020-07-21 16:56:19,156 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 82 transitions. Word has length 69 [2020-07-21 16:56:19,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:19,157 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 82 transitions. [2020-07-21 16:56:19,157 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:56:19,157 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 82 transitions. [2020-07-21 16:56:19,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-07-21 16:56:19,158 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:19,159 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:19,362 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:19,363 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:19,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:19,364 INFO L82 PathProgramCache]: Analyzing trace with hash 192972756, now seen corresponding path program 9 times [2020-07-21 16:56:19,364 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:19,365 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1289789223] [2020-07-21 16:56:19,365 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:19,412 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:19,413 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:19,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:56:19,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:19,617 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 132 proven. 42 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-07-21 16:56:19,617 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:19,813 INFO L134 CoverageAnalysis]: Checked inductivity of 238 backedges. 110 proven. 42 refuted. 0 times theorem prover too weak. 86 trivial. 0 not checked. [2020-07-21 16:56:19,813 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1289789223] [2020-07-21 16:56:19,814 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:19,814 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 23 [2020-07-21 16:56:19,814 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090325456] [2020-07-21 16:56:19,815 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:56:19,815 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:19,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:56:19,816 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:56:19,816 INFO L87 Difference]: Start difference. First operand 76 states and 82 transitions. Second operand 23 states. [2020-07-21 16:56:20,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:20,127 INFO L93 Difference]: Finished difference Result 147 states and 174 transitions. [2020-07-21 16:56:20,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 16:56:20,127 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 85 [2020-07-21 16:56:20,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:20,129 INFO L225 Difference]: With dead ends: 147 [2020-07-21 16:56:20,130 INFO L226 Difference]: Without dead ends: 106 [2020-07-21 16:56:20,132 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 141 SyntacticMatches, 7 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:56:20,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-07-21 16:56:20,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 78. [2020-07-21 16:56:20,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-07-21 16:56:20,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 84 transitions. [2020-07-21 16:56:20,155 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 84 transitions. Word has length 85 [2020-07-21 16:56:20,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:20,156 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 84 transitions. [2020-07-21 16:56:20,156 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:56:20,156 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 84 transitions. [2020-07-21 16:56:20,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-07-21 16:56:20,157 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:20,158 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:20,371 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:20,372 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:20,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:20,372 INFO L82 PathProgramCache]: Analyzing trace with hash 1722356985, now seen corresponding path program 10 times [2020-07-21 16:56:20,373 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:20,373 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1590316106] [2020-07-21 16:56:20,373 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:20,439 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:20,440 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:20,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:56:20,444 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:20,650 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 112 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 16:56:20,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:20,862 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 112 proven. 56 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 16:56:20,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1590316106] [2020-07-21 16:56:20,863 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:20,863 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 26 [2020-07-21 16:56:20,863 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276249321] [2020-07-21 16:56:20,864 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 16:56:20,864 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:20,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 16:56:20,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=481, Unknown=0, NotChecked=0, Total=650 [2020-07-21 16:56:20,865 INFO L87 Difference]: Start difference. First operand 78 states and 84 transitions. Second operand 26 states. [2020-07-21 16:56:21,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:21,198 INFO L93 Difference]: Finished difference Result 151 states and 181 transitions. [2020-07-21 16:56:21,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 16:56:21,199 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 87 [2020-07-21 16:56:21,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:21,201 INFO L225 Difference]: With dead ends: 151 [2020-07-21 16:56:21,201 INFO L226 Difference]: Without dead ends: 112 [2020-07-21 16:56:21,202 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 141 SyntacticMatches, 8 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 16:56:21,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-07-21 16:56:21,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 80. [2020-07-21 16:56:21,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-21 16:56:21,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 86 transitions. [2020-07-21 16:56:21,219 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 86 transitions. Word has length 87 [2020-07-21 16:56:21,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:21,219 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 86 transitions. [2020-07-21 16:56:21,219 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 16:56:21,220 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 86 transitions. [2020-07-21 16:56:21,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-07-21 16:56:21,222 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:21,222 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:21,435 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:21,436 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:21,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:21,437 INFO L82 PathProgramCache]: Analyzing trace with hash -1713181474, now seen corresponding path program 11 times [2020-07-21 16:56:21,437 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:21,438 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [574468704] [2020-07-21 16:56:21,438 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:21,489 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:21,489 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:21,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 16:56:21,493 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:21,565 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:56:21,587 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 86 proven. 98 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 16:56:21,587 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:21,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:56:21,743 INFO L134 CoverageAnalysis]: Checked inductivity of 268 backedges. 86 proven. 98 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 16:56:21,743 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [574468704] [2020-07-21 16:56:21,743 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:21,743 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-07-21 16:56:21,744 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729459407] [2020-07-21 16:56:21,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:56:21,744 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:21,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:56:21,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:56:21,745 INFO L87 Difference]: Start difference. First operand 80 states and 86 transitions. Second operand 14 states. [2020-07-21 16:56:21,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:21,881 INFO L93 Difference]: Finished difference Result 99 states and 107 transitions. [2020-07-21 16:56:21,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 16:56:21,882 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 89 [2020-07-21 16:56:21,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:21,883 INFO L225 Difference]: With dead ends: 99 [2020-07-21 16:56:21,883 INFO L226 Difference]: Without dead ends: 97 [2020-07-21 16:56:21,884 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 149 SyntacticMatches, 16 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=74, Invalid=136, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:56:21,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-07-21 16:56:21,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 92. [2020-07-21 16:56:21,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-07-21 16:56:21,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 99 transitions. [2020-07-21 16:56:21,892 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 99 transitions. Word has length 89 [2020-07-21 16:56:21,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:21,894 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 99 transitions. [2020-07-21 16:56:21,894 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:56:21,894 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 99 transitions. [2020-07-21 16:56:21,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-07-21 16:56:21,895 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:21,895 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:22,110 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:22,111 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:22,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:22,112 INFO L82 PathProgramCache]: Analyzing trace with hash -1950838080, now seen corresponding path program 12 times [2020-07-21 16:56:22,112 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:22,113 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2110472796] [2020-07-21 16:56:22,113 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:22,166 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:22,167 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:22,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 276 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 16:56:22,171 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:22,410 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 208 proven. 72 refuted. 0 times theorem prover too weak. 116 trivial. 0 not checked. [2020-07-21 16:56:22,411 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:22,659 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 178 proven. 72 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2020-07-21 16:56:22,660 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2110472796] [2020-07-21 16:56:22,660 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:22,660 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 29 [2020-07-21 16:56:22,661 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [410370589] [2020-07-21 16:56:22,661 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 16:56:22,661 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:22,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 16:56:22,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=604, Unknown=0, NotChecked=0, Total=812 [2020-07-21 16:56:22,662 INFO L87 Difference]: Start difference. First operand 92 states and 99 transitions. Second operand 29 states. [2020-07-21 16:56:23,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:23,102 INFO L93 Difference]: Finished difference Result 179 states and 213 transitions. [2020-07-21 16:56:23,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 16:56:23,102 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 105 [2020-07-21 16:56:23,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:23,103 INFO L225 Difference]: With dead ends: 179 [2020-07-21 16:56:23,104 INFO L226 Difference]: Without dead ends: 130 [2020-07-21 16:56:23,105 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 173 SyntacticMatches, 9 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 316 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 16:56:23,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-07-21 16:56:23,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 94. [2020-07-21 16:56:23,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-07-21 16:56:23,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 101 transitions. [2020-07-21 16:56:23,112 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 101 transitions. Word has length 105 [2020-07-21 16:56:23,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:23,112 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 101 transitions. [2020-07-21 16:56:23,112 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 16:56:23,112 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 101 transitions. [2020-07-21 16:56:23,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2020-07-21 16:56:23,114 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:23,114 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:23,316 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:23,317 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:23,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:23,318 INFO L82 PathProgramCache]: Analyzing trace with hash -734782619, now seen corresponding path program 13 times [2020-07-21 16:56:23,318 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:23,318 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2031100920] [2020-07-21 16:56:23,319 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:23,372 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:23,373 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:23,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 16:56:23,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:23,630 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 180 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-21 16:56:23,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:23,940 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 180 proven. 90 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-21 16:56:23,942 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2031100920] [2020-07-21 16:56:23,942 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:23,943 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 32 [2020-07-21 16:56:23,943 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22341354] [2020-07-21 16:56:23,944 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-21 16:56:23,944 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:23,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-21 16:56:23,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=741, Unknown=0, NotChecked=0, Total=992 [2020-07-21 16:56:23,945 INFO L87 Difference]: Start difference. First operand 94 states and 101 transitions. Second operand 32 states. [2020-07-21 16:56:24,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:24,396 INFO L93 Difference]: Finished difference Result 183 states and 220 transitions. [2020-07-21 16:56:24,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-21 16:56:24,396 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 107 [2020-07-21 16:56:24,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:24,398 INFO L225 Difference]: With dead ends: 183 [2020-07-21 16:56:24,398 INFO L226 Difference]: Without dead ends: 136 [2020-07-21 16:56:24,399 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 173 SyntacticMatches, 10 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 396 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2020-07-21 16:56:24,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2020-07-21 16:56:24,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 96. [2020-07-21 16:56:24,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-07-21 16:56:24,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 103 transitions. [2020-07-21 16:56:24,406 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 103 transitions. Word has length 107 [2020-07-21 16:56:24,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:24,407 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 103 transitions. [2020-07-21 16:56:24,407 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-21 16:56:24,407 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 103 transitions. [2020-07-21 16:56:24,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 16:56:24,408 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:24,408 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:24,621 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:24,622 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:24,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:24,623 INFO L82 PathProgramCache]: Analyzing trace with hash -336589110, now seen corresponding path program 14 times [2020-07-21 16:56:24,623 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:24,623 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2111927485] [2020-07-21 16:56:24,624 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:24,683 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:24,683 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:24,685 INFO L263 TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 16:56:24,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:24,778 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:56:24,813 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 128 proven. 162 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-21 16:56:24,814 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:24,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:56:25,014 INFO L134 CoverageAnalysis]: Checked inductivity of 434 backedges. 128 proven. 162 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2020-07-21 16:56:25,014 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2111927485] [2020-07-21 16:56:25,014 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:25,015 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2020-07-21 16:56:25,015 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846060419] [2020-07-21 16:56:25,015 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:56:25,016 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:25,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:56:25,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=145, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:56:25,016 INFO L87 Difference]: Start difference. First operand 96 states and 103 transitions. Second operand 16 states. [2020-07-21 16:56:25,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:25,141 INFO L93 Difference]: Finished difference Result 115 states and 124 transitions. [2020-07-21 16:56:25,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 16:56:25,142 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 109 [2020-07-21 16:56:25,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:25,143 INFO L225 Difference]: With dead ends: 115 [2020-07-21 16:56:25,144 INFO L226 Difference]: Without dead ends: 113 [2020-07-21 16:56:25,144 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 183 SyntacticMatches, 20 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=99, Invalid=173, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:56:25,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-21 16:56:25,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 108. [2020-07-21 16:56:25,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-21 16:56:25,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 116 transitions. [2020-07-21 16:56:25,155 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 116 transitions. Word has length 109 [2020-07-21 16:56:25,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:25,156 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 116 transitions. [2020-07-21 16:56:25,156 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:56:25,156 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 116 transitions. [2020-07-21 16:56:25,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2020-07-21 16:56:25,157 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:25,157 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 11, 11, 11, 11, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:25,367 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:25,368 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:25,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:25,369 INFO L82 PathProgramCache]: Analyzing trace with hash 1711037612, now seen corresponding path program 15 times [2020-07-21 16:56:25,369 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:25,369 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [632886031] [2020-07-21 16:56:25,370 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:25,429 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:25,429 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:25,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 16:56:25,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:25,735 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 300 proven. 110 refuted. 0 times theorem prover too weak. 184 trivial. 0 not checked. [2020-07-21 16:56:25,735 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:26,097 INFO L134 CoverageAnalysis]: Checked inductivity of 594 backedges. 262 proven. 110 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-07-21 16:56:26,098 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [632886031] [2020-07-21 16:56:26,098 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:26,098 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 35 [2020-07-21 16:56:26,098 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749123715] [2020-07-21 16:56:26,099 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 16:56:26,099 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:26,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 16:56:26,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=892, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 16:56:26,100 INFO L87 Difference]: Start difference. First operand 108 states and 116 transitions. Second operand 35 states. [2020-07-21 16:56:26,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:26,606 INFO L93 Difference]: Finished difference Result 211 states and 252 transitions. [2020-07-21 16:56:26,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 16:56:26,606 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 125 [2020-07-21 16:56:26,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:26,608 INFO L225 Difference]: With dead ends: 211 [2020-07-21 16:56:26,608 INFO L226 Difference]: Without dead ends: 154 [2020-07-21 16:56:26,609 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 205 SyntacticMatches, 11 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 485 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 16:56:26,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2020-07-21 16:56:26,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 110. [2020-07-21 16:56:26,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-21 16:56:26,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 118 transitions. [2020-07-21 16:56:26,617 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 118 transitions. Word has length 125 [2020-07-21 16:56:26,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:26,617 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 118 transitions. [2020-07-21 16:56:26,617 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 16:56:26,617 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 118 transitions. [2020-07-21 16:56:26,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2020-07-21 16:56:26,618 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:26,618 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:26,832 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:26,833 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:26,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:26,834 INFO L82 PathProgramCache]: Analyzing trace with hash 66724049, now seen corresponding path program 16 times [2020-07-21 16:56:26,834 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:26,835 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1343977217] [2020-07-21 16:56:26,835 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-21 16:56:26,896 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:26,896 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:26,898 INFO L263 TraceCheckSpWp]: Trace formula consists of 340 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 16:56:26,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:27,242 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 264 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-21 16:56:27,243 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:27,660 INFO L134 CoverageAnalysis]: Checked inductivity of 616 backedges. 264 proven. 132 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-21 16:56:27,660 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1343977217] [2020-07-21 16:56:27,660 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:27,661 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 38 [2020-07-21 16:56:27,661 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733866727] [2020-07-21 16:56:27,661 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-21 16:56:27,662 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:27,662 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-21 16:56:27,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=349, Invalid=1057, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 16:56:27,663 INFO L87 Difference]: Start difference. First operand 110 states and 118 transitions. Second operand 38 states. [2020-07-21 16:56:28,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:28,230 INFO L93 Difference]: Finished difference Result 215 states and 259 transitions. [2020-07-21 16:56:28,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 16:56:28,230 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 127 [2020-07-21 16:56:28,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:28,232 INFO L225 Difference]: With dead ends: 215 [2020-07-21 16:56:28,232 INFO L226 Difference]: Without dead ends: 160 [2020-07-21 16:56:28,233 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 265 GetRequests, 205 SyntacticMatches, 12 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 583 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=673, Invalid=1777, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 16:56:28,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2020-07-21 16:56:28,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 112. [2020-07-21 16:56:28,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-07-21 16:56:28,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 120 transitions. [2020-07-21 16:56:28,241 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 120 transitions. Word has length 127 [2020-07-21 16:56:28,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:28,241 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 120 transitions. [2020-07-21 16:56:28,242 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-21 16:56:28,242 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 120 transitions. [2020-07-21 16:56:28,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2020-07-21 16:56:28,243 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:28,243 INFO L422 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:28,458 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:28,459 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:28,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:28,460 INFO L82 PathProgramCache]: Analyzing trace with hash 429354934, now seen corresponding path program 17 times [2020-07-21 16:56:28,460 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:28,460 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1015921464] [2020-07-21 16:56:28,460 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:28,520 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:28,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:28,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 16:56:28,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:28,643 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:56:28,689 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 178 proven. 242 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-21 16:56:28,690 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:28,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:56:28,966 INFO L134 CoverageAnalysis]: Checked inductivity of 640 backedges. 178 proven. 242 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked. [2020-07-21 16:56:28,967 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1015921464] [2020-07-21 16:56:28,967 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:28,967 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-07-21 16:56:28,967 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [116858586] [2020-07-21 16:56:28,968 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 16:56:28,968 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:28,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 16:56:28,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=182, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:56:28,969 INFO L87 Difference]: Start difference. First operand 112 states and 120 transitions. Second operand 18 states. [2020-07-21 16:56:29,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:29,145 INFO L93 Difference]: Finished difference Result 131 states and 141 transitions. [2020-07-21 16:56:29,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 16:56:29,146 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 129 [2020-07-21 16:56:29,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:29,147 INFO L225 Difference]: With dead ends: 131 [2020-07-21 16:56:29,147 INFO L226 Difference]: Without dead ends: 129 [2020-07-21 16:56:29,148 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 217 SyntacticMatches, 24 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=128, Invalid=214, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:56:29,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2020-07-21 16:56:29,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 124. [2020-07-21 16:56:29,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-07-21 16:56:29,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 133 transitions. [2020-07-21 16:56:29,156 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 133 transitions. Word has length 129 [2020-07-21 16:56:29,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:29,156 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 133 transitions. [2020-07-21 16:56:29,156 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 16:56:29,156 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 133 transitions. [2020-07-21 16:56:29,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-07-21 16:56:29,157 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:29,158 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:29,371 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:29,372 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:29,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:29,372 INFO L82 PathProgramCache]: Analyzing trace with hash 1971086744, now seen corresponding path program 18 times [2020-07-21 16:56:29,373 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:29,373 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [409228015] [2020-07-21 16:56:29,373 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:29,439 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:29,440 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:29,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 384 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 16:56:29,443 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:29,852 INFO L134 CoverageAnalysis]: Checked inductivity of 832 backedges. 408 proven. 156 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2020-07-21 16:56:29,853 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:30,378 INFO L134 CoverageAnalysis]: Checked inductivity of 832 backedges. 362 proven. 156 refuted. 0 times theorem prover too weak. 314 trivial. 0 not checked. [2020-07-21 16:56:30,378 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [409228015] [2020-07-21 16:56:30,378 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:30,379 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 41 [2020-07-21 16:56:30,379 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331855027] [2020-07-21 16:56:30,380 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-07-21 16:56:30,380 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:30,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-07-21 16:56:30,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=404, Invalid=1236, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 16:56:30,381 INFO L87 Difference]: Start difference. First operand 124 states and 133 transitions. Second operand 41 states. [2020-07-21 16:56:31,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:31,033 INFO L93 Difference]: Finished difference Result 243 states and 291 transitions. [2020-07-21 16:56:31,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-21 16:56:31,033 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 145 [2020-07-21 16:56:31,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:31,035 INFO L225 Difference]: With dead ends: 243 [2020-07-21 16:56:31,035 INFO L226 Difference]: Without dead ends: 178 [2020-07-21 16:56:31,036 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 237 SyntacticMatches, 13 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 690 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=781, Invalid=2081, Unknown=0, NotChecked=0, Total=2862 [2020-07-21 16:56:31,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-07-21 16:56:31,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 126. [2020-07-21 16:56:31,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2020-07-21 16:56:31,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 135 transitions. [2020-07-21 16:56:31,044 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 135 transitions. Word has length 145 [2020-07-21 16:56:31,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:31,045 INFO L479 AbstractCegarLoop]: Abstraction has 126 states and 135 transitions. [2020-07-21 16:56:31,045 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-07-21 16:56:31,045 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 135 transitions. [2020-07-21 16:56:31,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2020-07-21 16:56:31,046 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:31,046 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:31,260 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:31,261 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:31,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:31,262 INFO L82 PathProgramCache]: Analyzing trace with hash 554411325, now seen corresponding path program 19 times [2020-07-21 16:56:31,262 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:31,263 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [360121133] [2020-07-21 16:56:31,263 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:31,331 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:31,331 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:31,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-21 16:56:31,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:31,786 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 364 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-21 16:56:31,786 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:32,276 INFO L134 CoverageAnalysis]: Checked inductivity of 858 backedges. 364 proven. 182 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-21 16:56:32,276 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [360121133] [2020-07-21 16:56:32,276 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:32,277 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 44 [2020-07-21 16:56:32,277 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [96961712] [2020-07-21 16:56:32,278 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-21 16:56:32,278 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:32,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-21 16:56:32,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=463, Invalid=1429, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 16:56:32,279 INFO L87 Difference]: Start difference. First operand 126 states and 135 transitions. Second operand 44 states. [2020-07-21 16:56:32,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:32,963 INFO L93 Difference]: Finished difference Result 247 states and 298 transitions. [2020-07-21 16:56:32,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-21 16:56:32,963 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 147 [2020-07-21 16:56:32,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:32,965 INFO L225 Difference]: With dead ends: 247 [2020-07-21 16:56:32,965 INFO L226 Difference]: Without dead ends: 184 [2020-07-21 16:56:32,967 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 307 GetRequests, 237 SyntacticMatches, 14 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 806 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=897, Invalid=2409, Unknown=0, NotChecked=0, Total=3306 [2020-07-21 16:56:32,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2020-07-21 16:56:32,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 128. [2020-07-21 16:56:32,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 128 states. [2020-07-21 16:56:32,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 137 transitions. [2020-07-21 16:56:32,974 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 137 transitions. Word has length 147 [2020-07-21 16:56:32,974 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:32,974 INFO L479 AbstractCegarLoop]: Abstraction has 128 states and 137 transitions. [2020-07-21 16:56:32,974 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-21 16:56:32,975 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 137 transitions. [2020-07-21 16:56:32,975 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2020-07-21 16:56:32,976 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:32,976 INFO L422 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:33,188 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:33,189 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:33,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:33,189 INFO L82 PathProgramCache]: Analyzing trace with hash 633966498, now seen corresponding path program 20 times [2020-07-21 16:56:33,190 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:33,190 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1619163131] [2020-07-21 16:56:33,190 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:33,259 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:33,260 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:33,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 404 conjuncts, 31 conjunts are in the unsatisfiable core [2020-07-21 16:56:33,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:33,408 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:56:33,444 INFO L134 CoverageAnalysis]: Checked inductivity of 886 backedges. 236 proven. 338 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-21 16:56:33,444 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:33,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:56:33,746 INFO L134 CoverageAnalysis]: Checked inductivity of 886 backedges. 236 proven. 338 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2020-07-21 16:56:33,746 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1619163131] [2020-07-21 16:56:33,746 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:33,747 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-07-21 16:56:33,747 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697515258] [2020-07-21 16:56:33,747 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 16:56:33,747 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:33,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 16:56:33,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=223, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:56:33,748 INFO L87 Difference]: Start difference. First operand 128 states and 137 transitions. Second operand 20 states. [2020-07-21 16:56:33,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:33,948 INFO L93 Difference]: Finished difference Result 147 states and 158 transitions. [2020-07-21 16:56:33,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 16:56:33,951 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 149 [2020-07-21 16:56:33,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:33,953 INFO L225 Difference]: With dead ends: 147 [2020-07-21 16:56:33,953 INFO L226 Difference]: Without dead ends: 145 [2020-07-21 16:56:33,954 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 251 SyntacticMatches, 28 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 293 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=161, Invalid=259, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:56:33,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2020-07-21 16:56:33,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 140. [2020-07-21 16:56:33,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-07-21 16:56:33,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 150 transitions. [2020-07-21 16:56:33,962 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 150 transitions. Word has length 149 [2020-07-21 16:56:33,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:33,962 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 150 transitions. [2020-07-21 16:56:33,962 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 16:56:33,962 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 150 transitions. [2020-07-21 16:56:33,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2020-07-21 16:56:33,964 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:33,964 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 15, 15, 15, 15, 15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:34,164 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:34,165 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:34,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:34,165 INFO L82 PathProgramCache]: Analyzing trace with hash -869716604, now seen corresponding path program 21 times [2020-07-21 16:56:34,166 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:34,166 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [708453553] [2020-07-21 16:56:34,166 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:34,248 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:34,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:34,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-21 16:56:34,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:34,770 INFO L134 CoverageAnalysis]: Checked inductivity of 1110 backedges. 532 proven. 210 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-21 16:56:34,770 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:35,364 INFO L134 CoverageAnalysis]: Checked inductivity of 1110 backedges. 478 proven. 210 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-21 16:56:35,365 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [708453553] [2020-07-21 16:56:35,365 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:35,365 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32] total 47 [2020-07-21 16:56:35,365 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [409646926] [2020-07-21 16:56:35,366 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-07-21 16:56:35,366 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:35,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-07-21 16:56:35,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1636, Unknown=0, NotChecked=0, Total=2162 [2020-07-21 16:56:35,367 INFO L87 Difference]: Start difference. First operand 140 states and 150 transitions. Second operand 47 states. [2020-07-21 16:56:36,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:36,159 INFO L93 Difference]: Finished difference Result 275 states and 330 transitions. [2020-07-21 16:56:36,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-21 16:56:36,160 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 165 [2020-07-21 16:56:36,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:36,162 INFO L225 Difference]: With dead ends: 275 [2020-07-21 16:56:36,162 INFO L226 Difference]: Without dead ends: 202 [2020-07-21 16:56:36,164 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 269 SyntacticMatches, 15 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 931 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1021, Invalid=2761, Unknown=0, NotChecked=0, Total=3782 [2020-07-21 16:56:36,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-21 16:56:36,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 142. [2020-07-21 16:56:36,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2020-07-21 16:56:36,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 152 transitions. [2020-07-21 16:56:36,172 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 152 transitions. Word has length 165 [2020-07-21 16:56:36,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:36,173 INFO L479 AbstractCegarLoop]: Abstraction has 142 states and 152 transitions. [2020-07-21 16:56:36,173 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-07-21 16:56:36,173 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 152 transitions. [2020-07-21 16:56:36,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2020-07-21 16:56:36,174 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:36,174 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:36,388 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:36,389 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:36,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:36,389 INFO L82 PathProgramCache]: Analyzing trace with hash -583456599, now seen corresponding path program 22 times [2020-07-21 16:56:36,390 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:36,390 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1517081633] [2020-07-21 16:56:36,391 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:36,469 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:36,469 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:36,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 34 conjunts are in the unsatisfiable core [2020-07-21 16:56:36,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:37,082 INFO L134 CoverageAnalysis]: Checked inductivity of 1140 backedges. 480 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-21 16:56:37,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:37,711 INFO L134 CoverageAnalysis]: Checked inductivity of 1140 backedges. 480 proven. 240 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-21 16:56:37,711 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1517081633] [2020-07-21 16:56:37,711 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:37,711 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34] total 50 [2020-07-21 16:56:37,711 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [193231169] [2020-07-21 16:56:37,712 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-21 16:56:37,712 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:37,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-21 16:56:37,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=593, Invalid=1857, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 16:56:37,713 INFO L87 Difference]: Start difference. First operand 142 states and 152 transitions. Second operand 50 states. [2020-07-21 16:56:38,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:38,659 INFO L93 Difference]: Finished difference Result 279 states and 337 transitions. [2020-07-21 16:56:38,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-21 16:56:38,659 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 167 [2020-07-21 16:56:38,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:38,662 INFO L225 Difference]: With dead ends: 279 [2020-07-21 16:56:38,662 INFO L226 Difference]: Without dead ends: 208 [2020-07-21 16:56:38,668 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 269 SyntacticMatches, 16 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1065 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1153, Invalid=3137, Unknown=0, NotChecked=0, Total=4290 [2020-07-21 16:56:38,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2020-07-21 16:56:38,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 144. [2020-07-21 16:56:38,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-21 16:56:38,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 154 transitions. [2020-07-21 16:56:38,679 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 154 transitions. Word has length 167 [2020-07-21 16:56:38,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:38,680 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 154 transitions. [2020-07-21 16:56:38,680 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-21 16:56:38,680 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 154 transitions. [2020-07-21 16:56:38,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2020-07-21 16:56:38,682 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:38,682 INFO L422 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:38,897 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:38,898 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:38,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:38,898 INFO L82 PathProgramCache]: Analyzing trace with hash -365498738, now seen corresponding path program 23 times [2020-07-21 16:56:38,898 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:38,899 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [396604763] [2020-07-21 16:56:38,899 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:39,008 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:39,009 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:39,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-21 16:56:39,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:39,184 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:56:39,220 INFO L134 CoverageAnalysis]: Checked inductivity of 1172 backedges. 302 proven. 450 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-21 16:56:39,220 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:39,245 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:56:39,615 INFO L134 CoverageAnalysis]: Checked inductivity of 1172 backedges. 302 proven. 450 refuted. 0 times theorem prover too weak. 420 trivial. 0 not checked. [2020-07-21 16:56:39,615 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [396604763] [2020-07-21 16:56:39,615 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:39,615 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2020-07-21 16:56:39,616 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [6047253] [2020-07-21 16:56:39,616 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 16:56:39,616 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:39,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 16:56:39,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=268, Unknown=0, NotChecked=0, Total=462 [2020-07-21 16:56:39,617 INFO L87 Difference]: Start difference. First operand 144 states and 154 transitions. Second operand 22 states. [2020-07-21 16:56:39,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:39,843 INFO L93 Difference]: Finished difference Result 163 states and 175 transitions. [2020-07-21 16:56:39,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-21 16:56:39,843 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 169 [2020-07-21 16:56:39,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:39,845 INFO L225 Difference]: With dead ends: 163 [2020-07-21 16:56:39,845 INFO L226 Difference]: Without dead ends: 161 [2020-07-21 16:56:39,849 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 285 SyntacticMatches, 32 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 367 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=198, Invalid=308, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:56:39,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2020-07-21 16:56:39,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 156. [2020-07-21 16:56:39,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2020-07-21 16:56:39,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 167 transitions. [2020-07-21 16:56:39,865 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 167 transitions. Word has length 169 [2020-07-21 16:56:39,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:39,866 INFO L479 AbstractCegarLoop]: Abstraction has 156 states and 167 transitions. [2020-07-21 16:56:39,866 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 16:56:39,866 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 167 transitions. [2020-07-21 16:56:39,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2020-07-21 16:56:39,868 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:39,868 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 17, 17, 17, 17, 17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:40,082 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:40,083 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:40,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:40,084 INFO L82 PathProgramCache]: Analyzing trace with hash -760007568, now seen corresponding path program 24 times [2020-07-21 16:56:40,084 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:40,084 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1233060616] [2020-07-21 16:56:40,085 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:40,196 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:40,197 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:40,200 INFO L263 TraceCheckSpWp]: Trace formula consists of 492 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-21 16:56:40,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:40,937 INFO L134 CoverageAnalysis]: Checked inductivity of 1428 backedges. 672 proven. 272 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2020-07-21 16:56:40,938 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:41,653 INFO L134 CoverageAnalysis]: Checked inductivity of 1428 backedges. 610 proven. 272 refuted. 0 times theorem prover too weak. 546 trivial. 0 not checked. [2020-07-21 16:56:41,653 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1233060616] [2020-07-21 16:56:41,654 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:41,654 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36] total 53 [2020-07-21 16:56:41,654 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [211806030] [2020-07-21 16:56:41,654 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-07-21 16:56:41,655 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:41,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-07-21 16:56:41,656 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=664, Invalid=2092, Unknown=0, NotChecked=0, Total=2756 [2020-07-21 16:56:41,656 INFO L87 Difference]: Start difference. First operand 156 states and 167 transitions. Second operand 53 states. [2020-07-21 16:56:42,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:42,714 INFO L93 Difference]: Finished difference Result 307 states and 369 transitions. [2020-07-21 16:56:42,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-21 16:56:42,714 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 185 [2020-07-21 16:56:42,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:42,717 INFO L225 Difference]: With dead ends: 307 [2020-07-21 16:56:42,717 INFO L226 Difference]: Without dead ends: 226 [2020-07-21 16:56:42,719 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 301 SyntacticMatches, 17 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1208 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1293, Invalid=3537, Unknown=0, NotChecked=0, Total=4830 [2020-07-21 16:56:42,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2020-07-21 16:56:42,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 158. [2020-07-21 16:56:42,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 158 states. [2020-07-21 16:56:42,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 169 transitions. [2020-07-21 16:56:42,730 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 169 transitions. Word has length 185 [2020-07-21 16:56:42,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:42,730 INFO L479 AbstractCegarLoop]: Abstraction has 158 states and 169 transitions. [2020-07-21 16:56:42,730 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-07-21 16:56:42,730 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 169 transitions. [2020-07-21 16:56:42,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2020-07-21 16:56:42,732 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:42,732 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:42,945 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:42,946 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:42,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:42,947 INFO L82 PathProgramCache]: Analyzing trace with hash -1861014763, now seen corresponding path program 25 times [2020-07-21 16:56:42,947 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:42,947 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1856959683] [2020-07-21 16:56:42,948 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:43,025 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:43,025 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:43,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 502 conjuncts, 38 conjunts are in the unsatisfiable core [2020-07-21 16:56:43,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:43,874 INFO L134 CoverageAnalysis]: Checked inductivity of 1462 backedges. 612 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-21 16:56:43,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:44,718 INFO L134 CoverageAnalysis]: Checked inductivity of 1462 backedges. 612 proven. 306 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-21 16:56:44,719 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1856959683] [2020-07-21 16:56:44,719 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:44,719 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38] total 56 [2020-07-21 16:56:44,719 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1402156043] [2020-07-21 16:56:44,720 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-07-21 16:56:44,720 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:44,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-07-21 16:56:44,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=739, Invalid=2341, Unknown=0, NotChecked=0, Total=3080 [2020-07-21 16:56:44,722 INFO L87 Difference]: Start difference. First operand 158 states and 169 transitions. Second operand 56 states. [2020-07-21 16:56:45,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:45,725 INFO L93 Difference]: Finished difference Result 311 states and 376 transitions. [2020-07-21 16:56:45,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 16:56:45,725 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 187 [2020-07-21 16:56:45,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:45,728 INFO L225 Difference]: With dead ends: 311 [2020-07-21 16:56:45,728 INFO L226 Difference]: Without dead ends: 232 [2020-07-21 16:56:45,730 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 301 SyntacticMatches, 18 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1360 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1441, Invalid=3961, Unknown=0, NotChecked=0, Total=5402 [2020-07-21 16:56:45,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2020-07-21 16:56:45,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 160. [2020-07-21 16:56:45,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2020-07-21 16:56:45,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 171 transitions. [2020-07-21 16:56:45,739 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 171 transitions. Word has length 187 [2020-07-21 16:56:45,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:45,740 INFO L479 AbstractCegarLoop]: Abstraction has 160 states and 171 transitions. [2020-07-21 16:56:45,740 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-07-21 16:56:45,740 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 171 transitions. [2020-07-21 16:56:45,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-21 16:56:45,741 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:45,741 INFO L422 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:45,954 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:45,955 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:45,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:45,956 INFO L82 PathProgramCache]: Analyzing trace with hash 927992954, now seen corresponding path program 26 times [2020-07-21 16:56:45,956 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:45,956 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [204848725] [2020-07-21 16:56:45,957 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:46,039 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:46,039 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:46,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 512 conjuncts, 39 conjunts are in the unsatisfiable core [2020-07-21 16:56:46,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:46,286 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:56:46,341 INFO L134 CoverageAnalysis]: Checked inductivity of 1498 backedges. 376 proven. 578 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-21 16:56:46,341 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:46,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:56:46,917 INFO L134 CoverageAnalysis]: Checked inductivity of 1498 backedges. 376 proven. 578 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-21 16:56:46,918 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [204848725] [2020-07-21 16:56:46,918 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:46,918 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2020-07-21 16:56:46,918 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1768701992] [2020-07-21 16:56:46,919 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 16:56:46,919 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:46,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 16:56:46,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=317, Unknown=0, NotChecked=0, Total=552 [2020-07-21 16:56:46,920 INFO L87 Difference]: Start difference. First operand 160 states and 171 transitions. Second operand 24 states. [2020-07-21 16:56:47,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:47,143 INFO L93 Difference]: Finished difference Result 179 states and 192 transitions. [2020-07-21 16:56:47,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 16:56:47,144 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 189 [2020-07-21 16:56:47,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:47,146 INFO L225 Difference]: With dead ends: 179 [2020-07-21 16:56:47,147 INFO L226 Difference]: Without dead ends: 177 [2020-07-21 16:56:47,147 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 319 SyntacticMatches, 36 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 449 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=239, Invalid=361, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:56:47,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2020-07-21 16:56:47,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 172. [2020-07-21 16:56:47,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2020-07-21 16:56:47,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 184 transitions. [2020-07-21 16:56:47,157 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 184 transitions. Word has length 189 [2020-07-21 16:56:47,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:47,158 INFO L479 AbstractCegarLoop]: Abstraction has 172 states and 184 transitions. [2020-07-21 16:56:47,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 16:56:47,158 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 184 transitions. [2020-07-21 16:56:47,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2020-07-21 16:56:47,160 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:47,160 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 20, 19, 19, 19, 19, 19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:47,373 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:47,374 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:47,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:47,375 INFO L82 PathProgramCache]: Analyzing trace with hash 1753938524, now seen corresponding path program 27 times [2020-07-21 16:56:47,375 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:47,375 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1013257255] [2020-07-21 16:56:47,376 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:47,457 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:47,457 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:47,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 546 conjuncts, 40 conjunts are in the unsatisfiable core [2020-07-21 16:56:47,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:48,260 INFO L134 CoverageAnalysis]: Checked inductivity of 1786 backedges. 828 proven. 342 refuted. 0 times theorem prover too weak. 616 trivial. 0 not checked. [2020-07-21 16:56:48,260 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:49,161 INFO L134 CoverageAnalysis]: Checked inductivity of 1786 backedges. 758 proven. 342 refuted. 0 times theorem prover too weak. 686 trivial. 0 not checked. [2020-07-21 16:56:49,162 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1013257255] [2020-07-21 16:56:49,162 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:49,162 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40] total 59 [2020-07-21 16:56:49,162 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1863747377] [2020-07-21 16:56:49,163 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-07-21 16:56:49,163 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:49,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-07-21 16:56:49,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=818, Invalid=2604, Unknown=0, NotChecked=0, Total=3422 [2020-07-21 16:56:49,164 INFO L87 Difference]: Start difference. First operand 172 states and 184 transitions. Second operand 59 states. [2020-07-21 16:56:50,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:50,263 INFO L93 Difference]: Finished difference Result 339 states and 408 transitions. [2020-07-21 16:56:50,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-21 16:56:50,264 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 205 [2020-07-21 16:56:50,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:50,266 INFO L225 Difference]: With dead ends: 339 [2020-07-21 16:56:50,266 INFO L226 Difference]: Without dead ends: 250 [2020-07-21 16:56:50,268 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 428 GetRequests, 333 SyntacticMatches, 19 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1521 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1597, Invalid=4409, Unknown=0, NotChecked=0, Total=6006 [2020-07-21 16:56:50,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2020-07-21 16:56:50,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 174. [2020-07-21 16:56:50,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2020-07-21 16:56:50,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 186 transitions. [2020-07-21 16:56:50,278 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 186 transitions. Word has length 205 [2020-07-21 16:56:50,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:50,278 INFO L479 AbstractCegarLoop]: Abstraction has 174 states and 186 transitions. [2020-07-21 16:56:50,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-07-21 16:56:50,279 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 186 transitions. [2020-07-21 16:56:50,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 208 [2020-07-21 16:56:50,280 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:50,281 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 20, 20, 19, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:50,493 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:50,494 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:50,494 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:50,495 INFO L82 PathProgramCache]: Analyzing trace with hash 1542073473, now seen corresponding path program 28 times [2020-07-21 16:56:50,495 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:50,496 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1213758680] [2020-07-21 16:56:50,496 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:50,582 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:50,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:50,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 42 conjunts are in the unsatisfiable core [2020-07-21 16:56:50,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:51,485 INFO L134 CoverageAnalysis]: Checked inductivity of 1824 backedges. 760 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-21 16:56:51,486 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:52,486 INFO L134 CoverageAnalysis]: Checked inductivity of 1824 backedges. 760 proven. 380 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-21 16:56:52,486 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1213758680] [2020-07-21 16:56:52,486 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:52,487 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42] total 62 [2020-07-21 16:56:52,487 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1622094928] [2020-07-21 16:56:52,487 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2020-07-21 16:56:52,487 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:52,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2020-07-21 16:56:52,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=901, Invalid=2881, Unknown=0, NotChecked=0, Total=3782 [2020-07-21 16:56:52,489 INFO L87 Difference]: Start difference. First operand 174 states and 186 transitions. Second operand 62 states. [2020-07-21 16:56:53,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:53,751 INFO L93 Difference]: Finished difference Result 343 states and 415 transitions. [2020-07-21 16:56:53,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-07-21 16:56:53,751 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 207 [2020-07-21 16:56:53,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:53,753 INFO L225 Difference]: With dead ends: 343 [2020-07-21 16:56:53,753 INFO L226 Difference]: Without dead ends: 256 [2020-07-21 16:56:53,755 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 433 GetRequests, 333 SyntacticMatches, 20 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1691 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1761, Invalid=4881, Unknown=0, NotChecked=0, Total=6642 [2020-07-21 16:56:53,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2020-07-21 16:56:53,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 176. [2020-07-21 16:56:53,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-21 16:56:53,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 188 transitions. [2020-07-21 16:56:53,765 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 188 transitions. Word has length 207 [2020-07-21 16:56:53,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:53,765 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 188 transitions. [2020-07-21 16:56:53,765 INFO L480 AbstractCegarLoop]: Interpolant automaton has 62 states. [2020-07-21 16:56:53,765 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 188 transitions. [2020-07-21 16:56:53,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2020-07-21 16:56:53,767 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:53,767 INFO L422 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:53,980 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:53,981 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:53,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:53,982 INFO L82 PathProgramCache]: Analyzing trace with hash -196777626, now seen corresponding path program 29 times [2020-07-21 16:56:53,982 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:53,982 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1138540839] [2020-07-21 16:56:53,983 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:54,068 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:54,068 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:54,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 566 conjuncts, 43 conjunts are in the unsatisfiable core [2020-07-21 16:56:54,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:54,348 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:56:54,400 INFO L134 CoverageAnalysis]: Checked inductivity of 1864 backedges. 458 proven. 722 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-21 16:56:54,400 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:54,428 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:56:54,996 INFO L134 CoverageAnalysis]: Checked inductivity of 1864 backedges. 458 proven. 722 refuted. 0 times theorem prover too weak. 684 trivial. 0 not checked. [2020-07-21 16:56:54,997 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1138540839] [2020-07-21 16:56:54,997 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:54,997 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 26 [2020-07-21 16:56:54,998 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [306839075] [2020-07-21 16:56:54,998 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 16:56:54,998 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:54,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 16:56:54,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=370, Unknown=0, NotChecked=0, Total=650 [2020-07-21 16:56:54,999 INFO L87 Difference]: Start difference. First operand 176 states and 188 transitions. Second operand 26 states. [2020-07-21 16:56:55,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:55,287 INFO L93 Difference]: Finished difference Result 195 states and 209 transitions. [2020-07-21 16:56:55,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 16:56:55,288 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 209 [2020-07-21 16:56:55,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:55,291 INFO L225 Difference]: With dead ends: 195 [2020-07-21 16:56:55,291 INFO L226 Difference]: Without dead ends: 193 [2020-07-21 16:56:55,292 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 418 GetRequests, 353 SyntacticMatches, 40 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 539 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=284, Invalid=418, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:56:55,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2020-07-21 16:56:55,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 188. [2020-07-21 16:56:55,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 188 states. [2020-07-21 16:56:55,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 201 transitions. [2020-07-21 16:56:55,310 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 201 transitions. Word has length 209 [2020-07-21 16:56:55,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:55,311 INFO L479 AbstractCegarLoop]: Abstraction has 188 states and 201 transitions. [2020-07-21 16:56:55,311 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 16:56:55,311 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 201 transitions. [2020-07-21 16:56:55,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2020-07-21 16:56:55,312 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:55,313 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 22, 21, 21, 21, 21, 21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:55,527 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:55,528 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:55,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:55,528 INFO L82 PathProgramCache]: Analyzing trace with hash 65077064, now seen corresponding path program 30 times [2020-07-21 16:56:55,528 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:55,529 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2121072106] [2020-07-21 16:56:55,529 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:55,636 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:55,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:55,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 600 conjuncts, 44 conjunts are in the unsatisfiable core [2020-07-21 16:56:55,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:56:56,597 INFO L134 CoverageAnalysis]: Checked inductivity of 2184 backedges. 1000 proven. 420 refuted. 0 times theorem prover too weak. 764 trivial. 0 not checked. [2020-07-21 16:56:56,597 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:56:57,703 INFO L134 CoverageAnalysis]: Checked inductivity of 2184 backedges. 922 proven. 420 refuted. 0 times theorem prover too weak. 842 trivial. 0 not checked. [2020-07-21 16:56:57,703 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2121072106] [2020-07-21 16:56:57,703 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:56:57,703 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44] total 65 [2020-07-21 16:56:57,704 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [56793189] [2020-07-21 16:56:57,704 INFO L459 AbstractCegarLoop]: Interpolant automaton has 65 states [2020-07-21 16:56:57,704 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:56:57,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2020-07-21 16:56:57,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=988, Invalid=3172, Unknown=0, NotChecked=0, Total=4160 [2020-07-21 16:56:57,706 INFO L87 Difference]: Start difference. First operand 188 states and 201 transitions. Second operand 65 states. [2020-07-21 16:56:59,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:56:59,034 INFO L93 Difference]: Finished difference Result 371 states and 447 transitions. [2020-07-21 16:56:59,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-21 16:56:59,034 INFO L78 Accepts]: Start accepts. Automaton has 65 states. Word has length 225 [2020-07-21 16:56:59,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:56:59,036 INFO L225 Difference]: With dead ends: 371 [2020-07-21 16:56:59,036 INFO L226 Difference]: Without dead ends: 274 [2020-07-21 16:56:59,038 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 470 GetRequests, 365 SyntacticMatches, 21 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1870 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1933, Invalid=5377, Unknown=0, NotChecked=0, Total=7310 [2020-07-21 16:56:59,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2020-07-21 16:56:59,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 190. [2020-07-21 16:56:59,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-21 16:56:59,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 203 transitions. [2020-07-21 16:56:59,048 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 203 transitions. Word has length 225 [2020-07-21 16:56:59,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:56:59,048 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 203 transitions. [2020-07-21 16:56:59,049 INFO L480 AbstractCegarLoop]: Interpolant automaton has 65 states. [2020-07-21 16:56:59,049 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 203 transitions. [2020-07-21 16:56:59,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 228 [2020-07-21 16:56:59,050 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:56:59,050 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 22, 22, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:56:59,263 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:59,264 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:56:59,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:56:59,265 INFO L82 PathProgramCache]: Analyzing trace with hash 1137618157, now seen corresponding path program 31 times [2020-07-21 16:56:59,265 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:56:59,265 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [715831060] [2020-07-21 16:56:59,266 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:56:59,359 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:56:59,359 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:56:59,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 610 conjuncts, 46 conjunts are in the unsatisfiable core [2020-07-21 16:56:59,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:57:00,402 INFO L134 CoverageAnalysis]: Checked inductivity of 2226 backedges. 924 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-21 16:57:00,402 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:57:01,601 INFO L134 CoverageAnalysis]: Checked inductivity of 2226 backedges. 924 proven. 462 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-21 16:57:01,601 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [715831060] [2020-07-21 16:57:01,601 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:57:01,602 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46] total 68 [2020-07-21 16:57:01,602 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1828400292] [2020-07-21 16:57:01,602 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-21 16:57:01,602 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:57:01,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-21 16:57:01,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1079, Invalid=3477, Unknown=0, NotChecked=0, Total=4556 [2020-07-21 16:57:01,603 INFO L87 Difference]: Start difference. First operand 190 states and 203 transitions. Second operand 68 states. [2020-07-21 16:57:03,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:57:03,064 INFO L93 Difference]: Finished difference Result 375 states and 454 transitions. [2020-07-21 16:57:03,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-07-21 16:57:03,064 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 227 [2020-07-21 16:57:03,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:57:03,066 INFO L225 Difference]: With dead ends: 375 [2020-07-21 16:57:03,066 INFO L226 Difference]: Without dead ends: 280 [2020-07-21 16:57:03,068 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 365 SyntacticMatches, 22 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2058 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=2113, Invalid=5897, Unknown=0, NotChecked=0, Total=8010 [2020-07-21 16:57:03,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2020-07-21 16:57:03,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 192. [2020-07-21 16:57:03,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 192 states. [2020-07-21 16:57:03,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 192 states to 192 states and 205 transitions. [2020-07-21 16:57:03,078 INFO L78 Accepts]: Start accepts. Automaton has 192 states and 205 transitions. Word has length 227 [2020-07-21 16:57:03,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:57:03,079 INFO L479 AbstractCegarLoop]: Abstraction has 192 states and 205 transitions. [2020-07-21 16:57:03,079 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-21 16:57:03,079 INFO L276 IsEmpty]: Start isEmpty. Operand 192 states and 205 transitions. [2020-07-21 16:57:03,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2020-07-21 16:57:03,080 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:57:03,081 INFO L422 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:57:03,287 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:03,288 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:57:03,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:57:03,289 INFO L82 PathProgramCache]: Analyzing trace with hash 1057457490, now seen corresponding path program 32 times [2020-07-21 16:57:03,289 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:57:03,289 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [289277976] [2020-07-21 16:57:03,289 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:03,383 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:57:03,384 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:57:03,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 620 conjuncts, 47 conjunts are in the unsatisfiable core [2020-07-21 16:57:03,388 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:57:03,720 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:57:03,786 INFO L134 CoverageAnalysis]: Checked inductivity of 2270 backedges. 548 proven. 882 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-21 16:57:03,786 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:57:03,815 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:57:04,510 INFO L134 CoverageAnalysis]: Checked inductivity of 2270 backedges. 548 proven. 882 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked. [2020-07-21 16:57:04,511 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [289277976] [2020-07-21 16:57:04,511 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:57:04,511 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 28 [2020-07-21 16:57:04,511 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1472594003] [2020-07-21 16:57:04,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-21 16:57:04,512 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:57:04,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-21 16:57:04,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=427, Unknown=0, NotChecked=0, Total=756 [2020-07-21 16:57:04,513 INFO L87 Difference]: Start difference. First operand 192 states and 205 transitions. Second operand 28 states. [2020-07-21 16:57:04,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:57:04,773 INFO L93 Difference]: Finished difference Result 211 states and 226 transitions. [2020-07-21 16:57:04,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-21 16:57:04,774 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 229 [2020-07-21 16:57:04,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:57:04,776 INFO L225 Difference]: With dead ends: 211 [2020-07-21 16:57:04,776 INFO L226 Difference]: Without dead ends: 209 [2020-07-21 16:57:04,777 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 458 GetRequests, 387 SyntacticMatches, 44 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 637 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=333, Invalid=479, Unknown=0, NotChecked=0, Total=812 [2020-07-21 16:57:04,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2020-07-21 16:57:04,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 204. [2020-07-21 16:57:04,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2020-07-21 16:57:04,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 218 transitions. [2020-07-21 16:57:04,787 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 218 transitions. Word has length 229 [2020-07-21 16:57:04,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:57:04,787 INFO L479 AbstractCegarLoop]: Abstraction has 204 states and 218 transitions. [2020-07-21 16:57:04,787 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-21 16:57:04,787 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 218 transitions. [2020-07-21 16:57:04,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 246 [2020-07-21 16:57:04,788 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:57:04,788 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 24, 23, 23, 23, 23, 23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:57:04,989 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:04,989 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:57:04,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:57:04,990 INFO L82 PathProgramCache]: Analyzing trace with hash -777665740, now seen corresponding path program 33 times [2020-07-21 16:57:04,990 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:57:04,991 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1852168529] [2020-07-21 16:57:04,991 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:05,089 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:57:05,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:57:05,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 654 conjuncts, 48 conjunts are in the unsatisfiable core [2020-07-21 16:57:05,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:57:06,188 INFO L134 CoverageAnalysis]: Checked inductivity of 2622 backedges. 1188 proven. 506 refuted. 0 times theorem prover too weak. 928 trivial. 0 not checked. [2020-07-21 16:57:06,189 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:57:07,500 INFO L134 CoverageAnalysis]: Checked inductivity of 2622 backedges. 1102 proven. 506 refuted. 0 times theorem prover too weak. 1014 trivial. 0 not checked. [2020-07-21 16:57:07,500 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1852168529] [2020-07-21 16:57:07,500 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:57:07,500 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48] total 71 [2020-07-21 16:57:07,501 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [459034909] [2020-07-21 16:57:07,501 INFO L459 AbstractCegarLoop]: Interpolant automaton has 71 states [2020-07-21 16:57:07,501 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:57:07,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2020-07-21 16:57:07,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1174, Invalid=3796, Unknown=0, NotChecked=0, Total=4970 [2020-07-21 16:57:07,503 INFO L87 Difference]: Start difference. First operand 204 states and 218 transitions. Second operand 71 states. [2020-07-21 16:57:09,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:57:09,008 INFO L93 Difference]: Finished difference Result 403 states and 486 transitions. [2020-07-21 16:57:09,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-21 16:57:09,009 INFO L78 Accepts]: Start accepts. Automaton has 71 states. Word has length 245 [2020-07-21 16:57:09,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:57:09,015 INFO L225 Difference]: With dead ends: 403 [2020-07-21 16:57:09,016 INFO L226 Difference]: Without dead ends: 298 [2020-07-21 16:57:09,018 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 397 SyntacticMatches, 23 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2255 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2301, Invalid=6441, Unknown=0, NotChecked=0, Total=8742 [2020-07-21 16:57:09,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2020-07-21 16:57:09,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 206. [2020-07-21 16:57:09,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2020-07-21 16:57:09,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 220 transitions. [2020-07-21 16:57:09,032 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 220 transitions. Word has length 245 [2020-07-21 16:57:09,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:57:09,032 INFO L479 AbstractCegarLoop]: Abstraction has 206 states and 220 transitions. [2020-07-21 16:57:09,032 INFO L480 AbstractCegarLoop]: Interpolant automaton has 71 states. [2020-07-21 16:57:09,032 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 220 transitions. [2020-07-21 16:57:09,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 248 [2020-07-21 16:57:09,035 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:57:09,035 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 23, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:57:09,249 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:09,250 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:57:09,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:57:09,251 INFO L82 PathProgramCache]: Analyzing trace with hash 1435577433, now seen corresponding path program 34 times [2020-07-21 16:57:09,251 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:57:09,251 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [566744801] [2020-07-21 16:57:09,252 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:09,357 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:57:09,358 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:57:09,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 664 conjuncts, 50 conjunts are in the unsatisfiable core [2020-07-21 16:57:09,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:57:10,546 INFO L134 CoverageAnalysis]: Checked inductivity of 2668 backedges. 1104 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-21 16:57:10,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:57:11,992 INFO L134 CoverageAnalysis]: Checked inductivity of 2668 backedges. 1104 proven. 552 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-21 16:57:11,992 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [566744801] [2020-07-21 16:57:11,992 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:57:11,993 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50] total 74 [2020-07-21 16:57:11,993 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1545477115] [2020-07-21 16:57:11,993 INFO L459 AbstractCegarLoop]: Interpolant automaton has 74 states [2020-07-21 16:57:11,993 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:57:11,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2020-07-21 16:57:11,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1273, Invalid=4129, Unknown=0, NotChecked=0, Total=5402 [2020-07-21 16:57:11,994 INFO L87 Difference]: Start difference. First operand 206 states and 220 transitions. Second operand 74 states. [2020-07-21 16:57:13,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:57:13,810 INFO L93 Difference]: Finished difference Result 407 states and 493 transitions. [2020-07-21 16:57:13,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-21 16:57:13,811 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 247 [2020-07-21 16:57:13,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:57:13,813 INFO L225 Difference]: With dead ends: 407 [2020-07-21 16:57:13,813 INFO L226 Difference]: Without dead ends: 304 [2020-07-21 16:57:13,814 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 517 GetRequests, 397 SyntacticMatches, 24 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2461 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=2497, Invalid=7009, Unknown=0, NotChecked=0, Total=9506 [2020-07-21 16:57:13,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2020-07-21 16:57:13,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 208. [2020-07-21 16:57:13,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 208 states. [2020-07-21 16:57:13,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 222 transitions. [2020-07-21 16:57:13,825 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 222 transitions. Word has length 247 [2020-07-21 16:57:13,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:57:13,825 INFO L479 AbstractCegarLoop]: Abstraction has 208 states and 222 transitions. [2020-07-21 16:57:13,825 INFO L480 AbstractCegarLoop]: Interpolant automaton has 74 states. [2020-07-21 16:57:13,825 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 222 transitions. [2020-07-21 16:57:13,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2020-07-21 16:57:13,827 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:57:13,827 INFO L422 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:57:14,042 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:14,043 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:57:14,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:57:14,043 INFO L82 PathProgramCache]: Analyzing trace with hash -1941512130, now seen corresponding path program 35 times [2020-07-21 16:57:14,044 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:57:14,044 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [107791519] [2020-07-21 16:57:14,044 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:14,158 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:57:14,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:57:14,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 674 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-21 16:57:14,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:57:14,614 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:57:14,682 INFO L134 CoverageAnalysis]: Checked inductivity of 2716 backedges. 646 proven. 1058 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-21 16:57:14,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:57:14,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:57:15,513 INFO L134 CoverageAnalysis]: Checked inductivity of 2716 backedges. 646 proven. 1058 refuted. 0 times theorem prover too weak. 1012 trivial. 0 not checked. [2020-07-21 16:57:15,514 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [107791519] [2020-07-21 16:57:15,514 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:57:15,514 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 30 [2020-07-21 16:57:15,514 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963391703] [2020-07-21 16:57:15,515 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-21 16:57:15,515 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:57:15,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-21 16:57:15,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=488, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:57:15,516 INFO L87 Difference]: Start difference. First operand 208 states and 222 transitions. Second operand 30 states. [2020-07-21 16:57:15,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:57:15,831 INFO L93 Difference]: Finished difference Result 227 states and 243 transitions. [2020-07-21 16:57:15,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-21 16:57:15,832 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 249 [2020-07-21 16:57:15,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:57:15,833 INFO L225 Difference]: With dead ends: 227 [2020-07-21 16:57:15,834 INFO L226 Difference]: Without dead ends: 225 [2020-07-21 16:57:15,834 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 421 SyntacticMatches, 48 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 743 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=386, Invalid=544, Unknown=0, NotChecked=0, Total=930 [2020-07-21 16:57:15,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2020-07-21 16:57:15,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 220. [2020-07-21 16:57:15,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 220 states. [2020-07-21 16:57:15,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 235 transitions. [2020-07-21 16:57:15,844 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 235 transitions. Word has length 249 [2020-07-21 16:57:15,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:57:15,845 INFO L479 AbstractCegarLoop]: Abstraction has 220 states and 235 transitions. [2020-07-21 16:57:15,845 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-21 16:57:15,845 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 235 transitions. [2020-07-21 16:57:15,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 266 [2020-07-21 16:57:15,847 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:57:15,847 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 26, 25, 25, 25, 25, 25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:57:16,060 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:16,061 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:57:16,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:57:16,062 INFO L82 PathProgramCache]: Analyzing trace with hash -712391136, now seen corresponding path program 36 times [2020-07-21 16:57:16,062 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:57:16,062 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1549833314] [2020-07-21 16:57:16,063 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:16,167 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:57:16,167 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:57:16,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 708 conjuncts, 52 conjunts are in the unsatisfiable core [2020-07-21 16:57:16,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:57:17,498 INFO L134 CoverageAnalysis]: Checked inductivity of 3100 backedges. 1392 proven. 600 refuted. 0 times theorem prover too weak. 1108 trivial. 0 not checked. [2020-07-21 16:57:17,498 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:57:19,058 INFO L134 CoverageAnalysis]: Checked inductivity of 3100 backedges. 1298 proven. 600 refuted. 0 times theorem prover too weak. 1202 trivial. 0 not checked. [2020-07-21 16:57:19,059 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1549833314] [2020-07-21 16:57:19,059 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:57:19,059 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52] total 77 [2020-07-21 16:57:19,059 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1246389056] [2020-07-21 16:57:19,059 INFO L459 AbstractCegarLoop]: Interpolant automaton has 77 states [2020-07-21 16:57:19,060 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:57:19,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2020-07-21 16:57:19,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1376, Invalid=4476, Unknown=0, NotChecked=0, Total=5852 [2020-07-21 16:57:19,060 INFO L87 Difference]: Start difference. First operand 220 states and 235 transitions. Second operand 77 states. [2020-07-21 16:57:20,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:57:20,901 INFO L93 Difference]: Finished difference Result 435 states and 525 transitions. [2020-07-21 16:57:20,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-07-21 16:57:20,902 INFO L78 Accepts]: Start accepts. Automaton has 77 states. Word has length 265 [2020-07-21 16:57:20,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:57:20,903 INFO L225 Difference]: With dead ends: 435 [2020-07-21 16:57:20,903 INFO L226 Difference]: Without dead ends: 322 [2020-07-21 16:57:20,904 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 554 GetRequests, 429 SyntacticMatches, 25 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2676 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=2701, Invalid=7601, Unknown=0, NotChecked=0, Total=10302 [2020-07-21 16:57:20,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2020-07-21 16:57:20,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 222. [2020-07-21 16:57:20,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2020-07-21 16:57:20,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 237 transitions. [2020-07-21 16:57:20,915 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 237 transitions. Word has length 265 [2020-07-21 16:57:20,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:57:20,915 INFO L479 AbstractCegarLoop]: Abstraction has 222 states and 237 transitions. [2020-07-21 16:57:20,915 INFO L480 AbstractCegarLoop]: Interpolant automaton has 77 states. [2020-07-21 16:57:20,915 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 237 transitions. [2020-07-21 16:57:20,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 268 [2020-07-21 16:57:20,917 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:57:20,917 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 26, 26, 25, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:57:21,118 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:21,119 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:57:21,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:57:21,119 INFO L82 PathProgramCache]: Analyzing trace with hash -993908027, now seen corresponding path program 37 times [2020-07-21 16:57:21,120 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:57:21,120 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1185311137] [2020-07-21 16:57:21,120 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:21,230 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:57:21,230 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:57:21,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 718 conjuncts, 54 conjunts are in the unsatisfiable core [2020-07-21 16:57:21,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:57:22,701 INFO L134 CoverageAnalysis]: Checked inductivity of 3150 backedges. 1300 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-21 16:57:22,701 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:57:24,413 INFO L134 CoverageAnalysis]: Checked inductivity of 3150 backedges. 1300 proven. 650 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-21 16:57:24,414 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1185311137] [2020-07-21 16:57:24,414 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:57:24,414 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54] total 80 [2020-07-21 16:57:24,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [556146422] [2020-07-21 16:57:24,415 INFO L459 AbstractCegarLoop]: Interpolant automaton has 80 states [2020-07-21 16:57:24,415 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:57:24,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2020-07-21 16:57:24,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1483, Invalid=4837, Unknown=0, NotChecked=0, Total=6320 [2020-07-21 16:57:24,416 INFO L87 Difference]: Start difference. First operand 222 states and 237 transitions. Second operand 80 states. [2020-07-21 16:57:26,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:57:26,387 INFO L93 Difference]: Finished difference Result 439 states and 532 transitions. [2020-07-21 16:57:26,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-07-21 16:57:26,387 INFO L78 Accepts]: Start accepts. Automaton has 80 states. Word has length 267 [2020-07-21 16:57:26,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:57:26,389 INFO L225 Difference]: With dead ends: 439 [2020-07-21 16:57:26,389 INFO L226 Difference]: Without dead ends: 328 [2020-07-21 16:57:26,390 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 559 GetRequests, 429 SyntacticMatches, 26 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2900 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=2913, Invalid=8217, Unknown=0, NotChecked=0, Total=11130 [2020-07-21 16:57:26,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2020-07-21 16:57:26,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 224. [2020-07-21 16:57:26,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2020-07-21 16:57:26,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 239 transitions. [2020-07-21 16:57:26,402 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 239 transitions. Word has length 267 [2020-07-21 16:57:26,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:57:26,402 INFO L479 AbstractCegarLoop]: Abstraction has 224 states and 239 transitions. [2020-07-21 16:57:26,402 INFO L480 AbstractCegarLoop]: Interpolant automaton has 80 states. [2020-07-21 16:57:26,402 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 239 transitions. [2020-07-21 16:57:26,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2020-07-21 16:57:26,404 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:57:26,405 INFO L422 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 26, 25, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:57:26,611 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:26,612 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:57:26,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:57:26,613 INFO L82 PathProgramCache]: Analyzing trace with hash -948700630, now seen corresponding path program 38 times [2020-07-21 16:57:26,613 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:57:26,613 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [78267979] [2020-07-21 16:57:26,614 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:26,721 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:57:26,721 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:57:26,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 728 conjuncts, 55 conjunts are in the unsatisfiable core [2020-07-21 16:57:26,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:57:27,276 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:57:27,352 INFO L134 CoverageAnalysis]: Checked inductivity of 3202 backedges. 752 proven. 1250 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-21 16:57:27,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:57:27,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:57:28,371 INFO L134 CoverageAnalysis]: Checked inductivity of 3202 backedges. 752 proven. 1250 refuted. 0 times theorem prover too weak. 1200 trivial. 0 not checked. [2020-07-21 16:57:28,371 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [78267979] [2020-07-21 16:57:28,372 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:57:28,372 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 32 [2020-07-21 16:57:28,372 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567014502] [2020-07-21 16:57:28,373 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-21 16:57:28,373 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:57:28,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-21 16:57:28,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=439, Invalid=553, Unknown=0, NotChecked=0, Total=992 [2020-07-21 16:57:28,374 INFO L87 Difference]: Start difference. First operand 224 states and 239 transitions. Second operand 32 states. [2020-07-21 16:57:28,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:57:28,743 INFO L93 Difference]: Finished difference Result 243 states and 260 transitions. [2020-07-21 16:57:28,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-21 16:57:28,745 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 269 [2020-07-21 16:57:28,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:57:28,747 INFO L225 Difference]: With dead ends: 243 [2020-07-21 16:57:28,747 INFO L226 Difference]: Without dead ends: 241 [2020-07-21 16:57:28,747 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 538 GetRequests, 455 SyntacticMatches, 52 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 857 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=443, Invalid=613, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:57:28,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2020-07-21 16:57:28,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 236. [2020-07-21 16:57:28,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 236 states. [2020-07-21 16:57:28,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 252 transitions. [2020-07-21 16:57:28,759 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 252 transitions. Word has length 269 [2020-07-21 16:57:28,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:57:28,761 INFO L479 AbstractCegarLoop]: Abstraction has 236 states and 252 transitions. [2020-07-21 16:57:28,761 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-21 16:57:28,762 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 252 transitions. [2020-07-21 16:57:28,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2020-07-21 16:57:28,763 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:57:28,764 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 27, 27, 27, 27, 27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:57:28,976 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:28,977 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:57:28,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:57:28,977 INFO L82 PathProgramCache]: Analyzing trace with hash 167610380, now seen corresponding path program 39 times [2020-07-21 16:57:28,978 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:57:28,978 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1176298404] [2020-07-21 16:57:28,978 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:29,103 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:57:29,104 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:57:29,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 762 conjuncts, 56 conjunts are in the unsatisfiable core [2020-07-21 16:57:29,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:57:30,841 INFO L134 CoverageAnalysis]: Checked inductivity of 3618 backedges. 1612 proven. 702 refuted. 0 times theorem prover too weak. 1304 trivial. 0 not checked. [2020-07-21 16:57:30,841 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:57:32,881 INFO L134 CoverageAnalysis]: Checked inductivity of 3618 backedges. 1510 proven. 702 refuted. 0 times theorem prover too weak. 1406 trivial. 0 not checked. [2020-07-21 16:57:32,882 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1176298404] [2020-07-21 16:57:32,882 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:57:32,882 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56] total 83 [2020-07-21 16:57:32,883 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975693250] [2020-07-21 16:57:32,883 INFO L459 AbstractCegarLoop]: Interpolant automaton has 83 states [2020-07-21 16:57:32,884 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:57:32,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2020-07-21 16:57:32,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1594, Invalid=5212, Unknown=0, NotChecked=0, Total=6806 [2020-07-21 16:57:32,885 INFO L87 Difference]: Start difference. First operand 236 states and 252 transitions. Second operand 83 states. [2020-07-21 16:57:35,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:57:35,186 INFO L93 Difference]: Finished difference Result 467 states and 564 transitions. [2020-07-21 16:57:35,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-07-21 16:57:35,186 INFO L78 Accepts]: Start accepts. Automaton has 83 states. Word has length 285 [2020-07-21 16:57:35,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:57:35,188 INFO L225 Difference]: With dead ends: 467 [2020-07-21 16:57:35,188 INFO L226 Difference]: Without dead ends: 346 [2020-07-21 16:57:35,189 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 596 GetRequests, 461 SyntacticMatches, 27 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3133 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=3133, Invalid=8857, Unknown=0, NotChecked=0, Total=11990 [2020-07-21 16:57:35,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2020-07-21 16:57:35,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 238. [2020-07-21 16:57:35,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2020-07-21 16:57:35,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 254 transitions. [2020-07-21 16:57:35,203 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 254 transitions. Word has length 285 [2020-07-21 16:57:35,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:57:35,203 INFO L479 AbstractCegarLoop]: Abstraction has 238 states and 254 transitions. [2020-07-21 16:57:35,203 INFO L480 AbstractCegarLoop]: Interpolant automaton has 83 states. [2020-07-21 16:57:35,203 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 254 transitions. [2020-07-21 16:57:35,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2020-07-21 16:57:35,205 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:57:35,205 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 28, 27, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:57:35,419 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:35,420 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:57:35,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:57:35,421 INFO L82 PathProgramCache]: Analyzing trace with hash 196225073, now seen corresponding path program 40 times [2020-07-21 16:57:35,421 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:57:35,421 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1338242606] [2020-07-21 16:57:35,421 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:35,536 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:57:35,536 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:57:35,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 772 conjuncts, 58 conjunts are in the unsatisfiable core [2020-07-21 16:57:35,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:57:37,324 INFO L134 CoverageAnalysis]: Checked inductivity of 3672 backedges. 1512 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-21 16:57:37,324 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:57:39,458 INFO L134 CoverageAnalysis]: Checked inductivity of 3672 backedges. 1512 proven. 756 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-21 16:57:39,458 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1338242606] [2020-07-21 16:57:39,458 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:57:39,458 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58] total 86 [2020-07-21 16:57:39,459 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511858159] [2020-07-21 16:57:39,459 INFO L459 AbstractCegarLoop]: Interpolant automaton has 86 states [2020-07-21 16:57:39,460 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:57:39,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2020-07-21 16:57:39,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1709, Invalid=5601, Unknown=0, NotChecked=0, Total=7310 [2020-07-21 16:57:39,461 INFO L87 Difference]: Start difference. First operand 238 states and 254 transitions. Second operand 86 states. [2020-07-21 16:57:41,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:57:41,891 INFO L93 Difference]: Finished difference Result 471 states and 571 transitions. [2020-07-21 16:57:41,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-07-21 16:57:41,892 INFO L78 Accepts]: Start accepts. Automaton has 86 states. Word has length 287 [2020-07-21 16:57:41,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:57:41,894 INFO L225 Difference]: With dead ends: 471 [2020-07-21 16:57:41,894 INFO L226 Difference]: Without dead ends: 352 [2020-07-21 16:57:41,900 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 461 SyntacticMatches, 28 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3375 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=3361, Invalid=9521, Unknown=0, NotChecked=0, Total=12882 [2020-07-21 16:57:41,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2020-07-21 16:57:41,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 240. [2020-07-21 16:57:41,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240 states. [2020-07-21 16:57:41,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 256 transitions. [2020-07-21 16:57:41,916 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 256 transitions. Word has length 287 [2020-07-21 16:57:41,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:57:41,918 INFO L479 AbstractCegarLoop]: Abstraction has 240 states and 256 transitions. [2020-07-21 16:57:41,918 INFO L480 AbstractCegarLoop]: Interpolant automaton has 86 states. [2020-07-21 16:57:41,918 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 256 transitions. [2020-07-21 16:57:41,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 290 [2020-07-21 16:57:41,920 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:57:41,920 INFO L422 BasicCegarLoop]: trace histogram [29, 28, 28, 28, 28, 27, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:57:42,134 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:42,135 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:57:42,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:57:42,136 INFO L82 PathProgramCache]: Analyzing trace with hash 1925141270, now seen corresponding path program 41 times [2020-07-21 16:57:42,136 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:57:42,136 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2003833805] [2020-07-21 16:57:42,137 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:42,267 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:57:42,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:57:42,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 782 conjuncts, 59 conjunts are in the unsatisfiable core [2020-07-21 16:57:42,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:57:42,867 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:57:42,953 INFO L134 CoverageAnalysis]: Checked inductivity of 3728 backedges. 866 proven. 1458 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-21 16:57:42,954 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:57:42,996 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:57:44,292 INFO L134 CoverageAnalysis]: Checked inductivity of 3728 backedges. 866 proven. 1458 refuted. 0 times theorem prover too weak. 1404 trivial. 0 not checked. [2020-07-21 16:57:44,292 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2003833805] [2020-07-21 16:57:44,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:57:44,293 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33] total 34 [2020-07-21 16:57:44,294 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668299719] [2020-07-21 16:57:44,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-21 16:57:44,295 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:57:44,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-21 16:57:44,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=500, Invalid=622, Unknown=0, NotChecked=0, Total=1122 [2020-07-21 16:57:44,295 INFO L87 Difference]: Start difference. First operand 240 states and 256 transitions. Second operand 34 states. [2020-07-21 16:57:44,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:57:44,741 INFO L93 Difference]: Finished difference Result 259 states and 277 transitions. [2020-07-21 16:57:44,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-21 16:57:44,742 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 289 [2020-07-21 16:57:44,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:57:44,743 INFO L225 Difference]: With dead ends: 259 [2020-07-21 16:57:44,743 INFO L226 Difference]: Without dead ends: 257 [2020-07-21 16:57:44,744 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 489 SyntacticMatches, 56 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 979 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=504, Invalid=686, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 16:57:44,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2020-07-21 16:57:44,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 252. [2020-07-21 16:57:44,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 252 states. [2020-07-21 16:57:44,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 269 transitions. [2020-07-21 16:57:44,757 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 269 transitions. Word has length 289 [2020-07-21 16:57:44,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:57:44,758 INFO L479 AbstractCegarLoop]: Abstraction has 252 states and 269 transitions. [2020-07-21 16:57:44,758 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-21 16:57:44,758 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 269 transitions. [2020-07-21 16:57:44,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2020-07-21 16:57:44,760 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:57:44,760 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 30, 29, 29, 29, 29, 29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:57:44,973 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:44,974 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:57:44,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:57:44,975 INFO L82 PathProgramCache]: Analyzing trace with hash -2144237320, now seen corresponding path program 42 times [2020-07-21 16:57:44,975 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:57:44,975 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1046876922] [2020-07-21 16:57:44,975 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:45,100 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:57:45,100 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:57:45,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 816 conjuncts, 60 conjunts are in the unsatisfiable core [2020-07-21 16:57:45,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:57:47,083 INFO L134 CoverageAnalysis]: Checked inductivity of 4176 backedges. 1848 proven. 812 refuted. 0 times theorem prover too weak. 1516 trivial. 0 not checked. [2020-07-21 16:57:47,084 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:57:49,405 INFO L134 CoverageAnalysis]: Checked inductivity of 4176 backedges. 1738 proven. 812 refuted. 0 times theorem prover too weak. 1626 trivial. 0 not checked. [2020-07-21 16:57:49,405 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1046876922] [2020-07-21 16:57:49,406 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:57:49,406 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60] total 89 [2020-07-21 16:57:49,406 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [114322086] [2020-07-21 16:57:49,407 INFO L459 AbstractCegarLoop]: Interpolant automaton has 89 states [2020-07-21 16:57:49,407 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:57:49,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2020-07-21 16:57:49,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1828, Invalid=6004, Unknown=0, NotChecked=0, Total=7832 [2020-07-21 16:57:49,408 INFO L87 Difference]: Start difference. First operand 252 states and 269 transitions. Second operand 89 states. [2020-07-21 16:57:52,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:57:52,105 INFO L93 Difference]: Finished difference Result 499 states and 603 transitions. [2020-07-21 16:57:52,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-07-21 16:57:52,105 INFO L78 Accepts]: Start accepts. Automaton has 89 states. Word has length 305 [2020-07-21 16:57:52,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:57:52,108 INFO L225 Difference]: With dead ends: 499 [2020-07-21 16:57:52,108 INFO L226 Difference]: Without dead ends: 370 [2020-07-21 16:57:52,110 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 638 GetRequests, 493 SyntacticMatches, 29 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3626 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=3597, Invalid=10209, Unknown=0, NotChecked=0, Total=13806 [2020-07-21 16:57:52,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2020-07-21 16:57:52,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 254. [2020-07-21 16:57:52,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254 states. [2020-07-21 16:57:52,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 271 transitions. [2020-07-21 16:57:52,125 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 271 transitions. Word has length 305 [2020-07-21 16:57:52,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:57:52,125 INFO L479 AbstractCegarLoop]: Abstraction has 254 states and 271 transitions. [2020-07-21 16:57:52,125 INFO L480 AbstractCegarLoop]: Interpolant automaton has 89 states. [2020-07-21 16:57:52,125 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 271 transitions. [2020-07-21 16:57:52,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 308 [2020-07-21 16:57:52,127 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:57:52,128 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 30, 30, 29, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:57:52,341 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:52,342 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:57:52,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:57:52,343 INFO L82 PathProgramCache]: Analyzing trace with hash 191997085, now seen corresponding path program 43 times [2020-07-21 16:57:52,343 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:57:52,343 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1393599867] [2020-07-21 16:57:52,343 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:57:52,468 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:57:52,468 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:57:52,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 826 conjuncts, 62 conjunts are in the unsatisfiable core [2020-07-21 16:57:52,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:57:54,612 INFO L134 CoverageAnalysis]: Checked inductivity of 4234 backedges. 1740 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-21 16:57:54,612 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:57:57,181 INFO L134 CoverageAnalysis]: Checked inductivity of 4234 backedges. 1740 proven. 870 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-21 16:57:57,181 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1393599867] [2020-07-21 16:57:57,181 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:57:57,181 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62] total 92 [2020-07-21 16:57:57,182 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436734909] [2020-07-21 16:57:57,182 INFO L459 AbstractCegarLoop]: Interpolant automaton has 92 states [2020-07-21 16:57:57,182 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:57:57,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2020-07-21 16:57:57,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1951, Invalid=6421, Unknown=0, NotChecked=0, Total=8372 [2020-07-21 16:57:57,183 INFO L87 Difference]: Start difference. First operand 254 states and 271 transitions. Second operand 92 states. [2020-07-21 16:58:00,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:00,013 INFO L93 Difference]: Finished difference Result 503 states and 610 transitions. [2020-07-21 16:58:00,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2020-07-21 16:58:00,014 INFO L78 Accepts]: Start accepts. Automaton has 92 states. Word has length 307 [2020-07-21 16:58:00,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:00,016 INFO L225 Difference]: With dead ends: 503 [2020-07-21 16:58:00,016 INFO L226 Difference]: Without dead ends: 376 [2020-07-21 16:58:00,018 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 643 GetRequests, 493 SyntacticMatches, 30 SemanticMatches, 120 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3886 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=3841, Invalid=10921, Unknown=0, NotChecked=0, Total=14762 [2020-07-21 16:58:00,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2020-07-21 16:58:00,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 256. [2020-07-21 16:58:00,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 256 states. [2020-07-21 16:58:00,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 256 states to 256 states and 273 transitions. [2020-07-21 16:58:00,032 INFO L78 Accepts]: Start accepts. Automaton has 256 states and 273 transitions. Word has length 307 [2020-07-21 16:58:00,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:00,033 INFO L479 AbstractCegarLoop]: Abstraction has 256 states and 273 transitions. [2020-07-21 16:58:00,033 INFO L480 AbstractCegarLoop]: Interpolant automaton has 92 states. [2020-07-21 16:58:00,033 INFO L276 IsEmpty]: Start isEmpty. Operand 256 states and 273 transitions. [2020-07-21 16:58:00,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2020-07-21 16:58:00,035 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:00,035 INFO L422 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 29, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:00,250 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:00,251 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:00,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:00,251 INFO L82 PathProgramCache]: Analyzing trace with hash -954635518, now seen corresponding path program 44 times [2020-07-21 16:58:00,251 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:00,251 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [917177050] [2020-07-21 16:58:00,252 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:00,375 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:00,375 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:00,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 836 conjuncts, 63 conjunts are in the unsatisfiable core [2020-07-21 16:58:00,381 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:01,088 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:58:01,189 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 988 proven. 1682 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-21 16:58:01,189 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:58:01,237 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:58:02,666 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 988 proven. 1682 refuted. 0 times theorem prover too weak. 1624 trivial. 0 not checked. [2020-07-21 16:58:02,667 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [917177050] [2020-07-21 16:58:02,667 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:58:02,667 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 36 [2020-07-21 16:58:02,667 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481098021] [2020-07-21 16:58:02,668 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 16:58:02,668 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:02,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 16:58:02,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=565, Invalid=695, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 16:58:02,668 INFO L87 Difference]: Start difference. First operand 256 states and 273 transitions. Second operand 36 states. [2020-07-21 16:58:03,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:03,174 INFO L93 Difference]: Finished difference Result 275 states and 294 transitions. [2020-07-21 16:58:03,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-07-21 16:58:03,175 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 309 [2020-07-21 16:58:03,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:03,177 INFO L225 Difference]: With dead ends: 275 [2020-07-21 16:58:03,177 INFO L226 Difference]: Without dead ends: 273 [2020-07-21 16:58:03,178 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 618 GetRequests, 523 SyntacticMatches, 60 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1109 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=569, Invalid=763, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 16:58:03,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 273 states. [2020-07-21 16:58:03,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 273 to 268. [2020-07-21 16:58:03,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 268 states. [2020-07-21 16:58:03,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 286 transitions. [2020-07-21 16:58:03,191 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 286 transitions. Word has length 309 [2020-07-21 16:58:03,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:03,191 INFO L479 AbstractCegarLoop]: Abstraction has 268 states and 286 transitions. [2020-07-21 16:58:03,191 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 16:58:03,192 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 286 transitions. [2020-07-21 16:58:03,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2020-07-21 16:58:03,194 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:03,194 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 31, 31, 31, 31, 31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:03,407 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:03,408 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:03,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:03,408 INFO L82 PathProgramCache]: Analyzing trace with hash -2146023196, now seen corresponding path program 45 times [2020-07-21 16:58:03,409 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:03,409 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [762657539] [2020-07-21 16:58:03,409 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:03,541 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:03,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:03,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 870 conjuncts, 64 conjunts are in the unsatisfiable core [2020-07-21 16:58:03,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:05,866 INFO L134 CoverageAnalysis]: Checked inductivity of 4774 backedges. 2100 proven. 930 refuted. 0 times theorem prover too weak. 1744 trivial. 0 not checked. [2020-07-21 16:58:05,866 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:58:08,672 INFO L134 CoverageAnalysis]: Checked inductivity of 4774 backedges. 1982 proven. 930 refuted. 0 times theorem prover too weak. 1862 trivial. 0 not checked. [2020-07-21 16:58:08,673 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [762657539] [2020-07-21 16:58:08,673 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:58:08,673 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64] total 95 [2020-07-21 16:58:08,674 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915941664] [2020-07-21 16:58:08,675 INFO L459 AbstractCegarLoop]: Interpolant automaton has 95 states [2020-07-21 16:58:08,675 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:08,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2020-07-21 16:58:08,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2078, Invalid=6852, Unknown=0, NotChecked=0, Total=8930 [2020-07-21 16:58:08,677 INFO L87 Difference]: Start difference. First operand 268 states and 286 transitions. Second operand 95 states. [2020-07-21 16:58:13,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:13,030 INFO L93 Difference]: Finished difference Result 531 states and 642 transitions. [2020-07-21 16:58:13,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2020-07-21 16:58:13,031 INFO L78 Accepts]: Start accepts. Automaton has 95 states. Word has length 325 [2020-07-21 16:58:13,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:13,034 INFO L225 Difference]: With dead ends: 531 [2020-07-21 16:58:13,034 INFO L226 Difference]: Without dead ends: 394 [2020-07-21 16:58:13,037 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 680 GetRequests, 525 SyntacticMatches, 31 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4155 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=4093, Invalid=11657, Unknown=0, NotChecked=0, Total=15750 [2020-07-21 16:58:13,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2020-07-21 16:58:13,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 270. [2020-07-21 16:58:13,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 270 states. [2020-07-21 16:58:13,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 270 states to 270 states and 288 transitions. [2020-07-21 16:58:13,060 INFO L78 Accepts]: Start accepts. Automaton has 270 states and 288 transitions. Word has length 325 [2020-07-21 16:58:13,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:13,061 INFO L479 AbstractCegarLoop]: Abstraction has 270 states and 288 transitions. [2020-07-21 16:58:13,061 INFO L480 AbstractCegarLoop]: Interpolant automaton has 95 states. [2020-07-21 16:58:13,061 INFO L276 IsEmpty]: Start isEmpty. Operand 270 states and 288 transitions. [2020-07-21 16:58:13,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2020-07-21 16:58:13,065 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:13,066 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 32, 31, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:13,279 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:13,280 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:13,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:13,281 INFO L82 PathProgramCache]: Analyzing trace with hash 735125513, now seen corresponding path program 46 times [2020-07-21 16:58:13,281 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:13,281 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1126055217] [2020-07-21 16:58:13,281 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:13,484 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:13,484 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:13,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 880 conjuncts, 66 conjunts are in the unsatisfiable core [2020-07-21 16:58:13,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:16,924 INFO L134 CoverageAnalysis]: Checked inductivity of 4836 backedges. 1984 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-21 16:58:16,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:58:19,977 INFO L134 CoverageAnalysis]: Checked inductivity of 4836 backedges. 1984 proven. 992 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-21 16:58:19,977 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1126055217] [2020-07-21 16:58:19,977 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:58:19,977 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66] total 98 [2020-07-21 16:58:19,978 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1251579730] [2020-07-21 16:58:19,978 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2020-07-21 16:58:19,978 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:19,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2020-07-21 16:58:19,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2209, Invalid=7297, Unknown=0, NotChecked=0, Total=9506 [2020-07-21 16:58:19,979 INFO L87 Difference]: Start difference. First operand 270 states and 288 transitions. Second operand 98 states. [2020-07-21 16:58:23,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:23,309 INFO L93 Difference]: Finished difference Result 535 states and 649 transitions. [2020-07-21 16:58:23,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2020-07-21 16:58:23,309 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 327 [2020-07-21 16:58:23,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:23,311 INFO L225 Difference]: With dead ends: 535 [2020-07-21 16:58:23,311 INFO L226 Difference]: Without dead ends: 400 [2020-07-21 16:58:23,313 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 685 GetRequests, 525 SyntacticMatches, 32 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4433 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=4353, Invalid=12417, Unknown=0, NotChecked=0, Total=16770 [2020-07-21 16:58:23,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 400 states. [2020-07-21 16:58:23,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 400 to 272. [2020-07-21 16:58:23,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 272 states. [2020-07-21 16:58:23,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 290 transitions. [2020-07-21 16:58:23,332 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 290 transitions. Word has length 327 [2020-07-21 16:58:23,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:23,332 INFO L479 AbstractCegarLoop]: Abstraction has 272 states and 290 transitions. [2020-07-21 16:58:23,333 INFO L480 AbstractCegarLoop]: Interpolant automaton has 98 states. [2020-07-21 16:58:23,333 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 290 transitions. [2020-07-21 16:58:23,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 330 [2020-07-21 16:58:23,335 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:23,336 INFO L422 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 32, 31, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:23,549 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:23,550 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:23,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:23,551 INFO L82 PathProgramCache]: Analyzing trace with hash -734871058, now seen corresponding path program 47 times [2020-07-21 16:58:23,551 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:23,551 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [186245728] [2020-07-21 16:58:23,552 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:23,689 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:23,689 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:23,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 890 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-21 16:58:23,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:24,555 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:58:24,667 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1118 proven. 1922 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-21 16:58:24,667 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:58:24,722 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:58:26,470 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 1118 proven. 1922 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-21 16:58:26,471 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [186245728] [2020-07-21 16:58:26,471 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:58:26,471 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37] total 38 [2020-07-21 16:58:26,471 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1059041194] [2020-07-21 16:58:26,472 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-21 16:58:26,472 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:26,472 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-21 16:58:26,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=634, Invalid=772, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 16:58:26,472 INFO L87 Difference]: Start difference. First operand 272 states and 290 transitions. Second operand 38 states. [2020-07-21 16:58:26,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:26,976 INFO L93 Difference]: Finished difference Result 291 states and 311 transitions. [2020-07-21 16:58:26,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 16:58:26,977 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 329 [2020-07-21 16:58:26,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:26,979 INFO L225 Difference]: With dead ends: 291 [2020-07-21 16:58:26,979 INFO L226 Difference]: Without dead ends: 289 [2020-07-21 16:58:26,979 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 658 GetRequests, 557 SyntacticMatches, 64 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1247 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=638, Invalid=844, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 16:58:26,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2020-07-21 16:58:26,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 284. [2020-07-21 16:58:26,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 284 states. [2020-07-21 16:58:26,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 303 transitions. [2020-07-21 16:58:26,993 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 303 transitions. Word has length 329 [2020-07-21 16:58:26,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:26,994 INFO L479 AbstractCegarLoop]: Abstraction has 284 states and 303 transitions. [2020-07-21 16:58:26,994 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-21 16:58:26,994 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 303 transitions. [2020-07-21 16:58:26,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 346 [2020-07-21 16:58:26,997 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:26,997 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 34, 33, 33, 33, 33, 33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:27,210 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:27,211 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:27,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:27,211 INFO L82 PathProgramCache]: Analyzing trace with hash -1470347312, now seen corresponding path program 48 times [2020-07-21 16:58:27,212 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:27,212 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [804295241] [2020-07-21 16:58:27,212 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:27,359 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:27,359 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:27,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 924 conjuncts, 68 conjunts are in the unsatisfiable core [2020-07-21 16:58:27,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:30,231 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 2368 proven. 1056 refuted. 0 times theorem prover too weak. 1988 trivial. 0 not checked. [2020-07-21 16:58:30,231 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:58:33,598 INFO L134 CoverageAnalysis]: Checked inductivity of 5412 backedges. 2242 proven. 1056 refuted. 0 times theorem prover too weak. 2114 trivial. 0 not checked. [2020-07-21 16:58:33,599 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [804295241] [2020-07-21 16:58:33,599 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:58:33,599 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68] total 101 [2020-07-21 16:58:33,599 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1182981822] [2020-07-21 16:58:33,600 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2020-07-21 16:58:33,600 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:33,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2020-07-21 16:58:33,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2344, Invalid=7756, Unknown=0, NotChecked=0, Total=10100 [2020-07-21 16:58:33,602 INFO L87 Difference]: Start difference. First operand 284 states and 303 transitions. Second operand 101 states. [2020-07-21 16:58:37,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:37,794 INFO L93 Difference]: Finished difference Result 563 states and 681 transitions. [2020-07-21 16:58:37,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2020-07-21 16:58:37,795 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 345 [2020-07-21 16:58:37,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:37,797 INFO L225 Difference]: With dead ends: 563 [2020-07-21 16:58:37,797 INFO L226 Difference]: Without dead ends: 418 [2020-07-21 16:58:37,799 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 722 GetRequests, 557 SyntacticMatches, 33 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4720 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=4621, Invalid=13201, Unknown=0, NotChecked=0, Total=17822 [2020-07-21 16:58:37,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 418 states. [2020-07-21 16:58:37,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 418 to 286. [2020-07-21 16:58:37,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 286 states. [2020-07-21 16:58:37,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 305 transitions. [2020-07-21 16:58:37,814 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 305 transitions. Word has length 345 [2020-07-21 16:58:37,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:37,815 INFO L479 AbstractCegarLoop]: Abstraction has 286 states and 305 transitions. [2020-07-21 16:58:37,815 INFO L480 AbstractCegarLoop]: Interpolant automaton has 101 states. [2020-07-21 16:58:37,815 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 305 transitions. [2020-07-21 16:58:37,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 348 [2020-07-21 16:58:37,817 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:37,818 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 34, 34, 33, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:38,033 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:38,034 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:38,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:38,035 INFO L82 PathProgramCache]: Analyzing trace with hash 2069961333, now seen corresponding path program 49 times [2020-07-21 16:58:38,035 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:38,035 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [674870817] [2020-07-21 16:58:38,035 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:38,178 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:38,178 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:38,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 934 conjuncts, 70 conjunts are in the unsatisfiable core [2020-07-21 16:58:38,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:41,289 INFO L134 CoverageAnalysis]: Checked inductivity of 5478 backedges. 2244 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-21 16:58:41,289 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:58:44,950 INFO L134 CoverageAnalysis]: Checked inductivity of 5478 backedges. 2244 proven. 1122 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-21 16:58:44,951 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [674870817] [2020-07-21 16:58:44,951 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:58:44,951 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70] total 104 [2020-07-21 16:58:44,951 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089924204] [2020-07-21 16:58:44,952 INFO L459 AbstractCegarLoop]: Interpolant automaton has 104 states [2020-07-21 16:58:44,952 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:44,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2020-07-21 16:58:44,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2483, Invalid=8229, Unknown=0, NotChecked=0, Total=10712 [2020-07-21 16:58:44,953 INFO L87 Difference]: Start difference. First operand 286 states and 305 transitions. Second operand 104 states. [2020-07-21 16:58:49,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:49,070 INFO L93 Difference]: Finished difference Result 567 states and 688 transitions. [2020-07-21 16:58:49,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2020-07-21 16:58:49,071 INFO L78 Accepts]: Start accepts. Automaton has 104 states. Word has length 347 [2020-07-21 16:58:49,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:49,073 INFO L225 Difference]: With dead ends: 567 [2020-07-21 16:58:49,073 INFO L226 Difference]: Without dead ends: 424 [2020-07-21 16:58:49,074 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 727 GetRequests, 557 SyntacticMatches, 34 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5016 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=4897, Invalid=14009, Unknown=0, NotChecked=0, Total=18906 [2020-07-21 16:58:49,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2020-07-21 16:58:49,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 288. [2020-07-21 16:58:49,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 288 states. [2020-07-21 16:58:49,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 288 states to 288 states and 307 transitions. [2020-07-21 16:58:49,090 INFO L78 Accepts]: Start accepts. Automaton has 288 states and 307 transitions. Word has length 347 [2020-07-21 16:58:49,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:49,090 INFO L479 AbstractCegarLoop]: Abstraction has 288 states and 307 transitions. [2020-07-21 16:58:49,090 INFO L480 AbstractCegarLoop]: Interpolant automaton has 104 states. [2020-07-21 16:58:49,090 INFO L276 IsEmpty]: Start isEmpty. Operand 288 states and 307 transitions. [2020-07-21 16:58:49,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 350 [2020-07-21 16:58:49,093 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:49,093 INFO L422 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 34, 33, 33, 33, 33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:49,306 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:49,307 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:49,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:49,307 INFO L82 PathProgramCache]: Analyzing trace with hash -1602496550, now seen corresponding path program 50 times [2020-07-21 16:58:49,307 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:49,308 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1523551342] [2020-07-21 16:58:49,308 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:49,455 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:49,455 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:49,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 944 conjuncts, 71 conjunts are in the unsatisfiable core [2020-07-21 16:58:49,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:50,514 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:58:50,651 INFO L134 CoverageAnalysis]: Checked inductivity of 5546 backedges. 1256 proven. 2178 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-21 16:58:50,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:58:50,716 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:58:52,845 INFO L134 CoverageAnalysis]: Checked inductivity of 5546 backedges. 1256 proven. 2178 refuted. 0 times theorem prover too weak. 2112 trivial. 0 not checked. [2020-07-21 16:58:52,846 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1523551342] [2020-07-21 16:58:52,846 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:58:52,846 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39] total 40 [2020-07-21 16:58:52,846 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [538923916] [2020-07-21 16:58:52,847 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-07-21 16:58:52,847 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:58:52,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-07-21 16:58:52,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=707, Invalid=853, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 16:58:52,847 INFO L87 Difference]: Start difference. First operand 288 states and 307 transitions. Second operand 40 states. [2020-07-21 16:58:53,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:58:53,473 INFO L93 Difference]: Finished difference Result 307 states and 328 transitions. [2020-07-21 16:58:53,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-07-21 16:58:53,475 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 349 [2020-07-21 16:58:53,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:58:53,477 INFO L225 Difference]: With dead ends: 307 [2020-07-21 16:58:53,477 INFO L226 Difference]: Without dead ends: 305 [2020-07-21 16:58:53,478 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 698 GetRequests, 591 SyntacticMatches, 68 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1393 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=711, Invalid=929, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 16:58:53,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2020-07-21 16:58:53,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 300. [2020-07-21 16:58:53,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 300 states. [2020-07-21 16:58:53,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 320 transitions. [2020-07-21 16:58:53,488 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 320 transitions. Word has length 349 [2020-07-21 16:58:53,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:58:53,489 INFO L479 AbstractCegarLoop]: Abstraction has 300 states and 320 transitions. [2020-07-21 16:58:53,489 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-07-21 16:58:53,489 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 320 transitions. [2020-07-21 16:58:53,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 366 [2020-07-21 16:58:53,491 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:58:53,492 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 35, 35, 35, 35, 35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:58:53,705 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:53,706 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:58:53,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:58:53,707 INFO L82 PathProgramCache]: Analyzing trace with hash 242484668, now seen corresponding path program 51 times [2020-07-21 16:58:53,707 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:58:53,707 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2107051313] [2020-07-21 16:58:53,707 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:58:53,857 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:58:53,857 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:58:53,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 978 conjuncts, 72 conjunts are in the unsatisfiable core [2020-07-21 16:58:53,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:58:57,303 INFO L134 CoverageAnalysis]: Checked inductivity of 6090 backedges. 2652 proven. 1190 refuted. 0 times theorem prover too weak. 2248 trivial. 0 not checked. [2020-07-21 16:58:57,304 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:59:01,404 INFO L134 CoverageAnalysis]: Checked inductivity of 6090 backedges. 2518 proven. 1190 refuted. 0 times theorem prover too weak. 2382 trivial. 0 not checked. [2020-07-21 16:59:01,404 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2107051313] [2020-07-21 16:59:01,404 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:59:01,405 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72] total 107 [2020-07-21 16:59:01,405 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [18869064] [2020-07-21 16:59:01,406 INFO L459 AbstractCegarLoop]: Interpolant automaton has 107 states [2020-07-21 16:59:01,406 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:59:01,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2020-07-21 16:59:01,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2626, Invalid=8716, Unknown=0, NotChecked=0, Total=11342 [2020-07-21 16:59:01,408 INFO L87 Difference]: Start difference. First operand 300 states and 320 transitions. Second operand 107 states. [2020-07-21 16:59:06,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:59:06,295 INFO L93 Difference]: Finished difference Result 595 states and 720 transitions. [2020-07-21 16:59:06,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2020-07-21 16:59:06,295 INFO L78 Accepts]: Start accepts. Automaton has 107 states. Word has length 365 [2020-07-21 16:59:06,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:59:06,297 INFO L225 Difference]: With dead ends: 595 [2020-07-21 16:59:06,297 INFO L226 Difference]: Without dead ends: 442 [2020-07-21 16:59:06,299 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 764 GetRequests, 589 SyntacticMatches, 35 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5321 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=5181, Invalid=14841, Unknown=0, NotChecked=0, Total=20022 [2020-07-21 16:59:06,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 442 states. [2020-07-21 16:59:06,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 442 to 302. [2020-07-21 16:59:06,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 302 states. [2020-07-21 16:59:06,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 322 transitions. [2020-07-21 16:59:06,310 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 322 transitions. Word has length 365 [2020-07-21 16:59:06,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:59:06,311 INFO L479 AbstractCegarLoop]: Abstraction has 302 states and 322 transitions. [2020-07-21 16:59:06,311 INFO L480 AbstractCegarLoop]: Interpolant automaton has 107 states. [2020-07-21 16:59:06,311 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 322 transitions. [2020-07-21 16:59:06,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 368 [2020-07-21 16:59:06,313 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:59:06,313 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 36, 35, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:59:06,513 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:06,514 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:59:06,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:59:06,515 INFO L82 PathProgramCache]: Analyzing trace with hash -814607391, now seen corresponding path program 52 times [2020-07-21 16:59:06,515 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:59:06,515 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [534170180] [2020-07-21 16:59:06,515 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:06,667 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:59:06,668 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:59:06,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 988 conjuncts, 74 conjunts are in the unsatisfiable core [2020-07-21 16:59:06,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:59:10,455 INFO L134 CoverageAnalysis]: Checked inductivity of 6160 backedges. 2520 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-21 16:59:10,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:59:15,062 INFO L134 CoverageAnalysis]: Checked inductivity of 6160 backedges. 2520 proven. 1260 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-21 16:59:15,063 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [534170180] [2020-07-21 16:59:15,063 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:59:15,063 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [74, 74] total 110 [2020-07-21 16:59:15,063 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1850278333] [2020-07-21 16:59:15,064 INFO L459 AbstractCegarLoop]: Interpolant automaton has 110 states [2020-07-21 16:59:15,064 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:59:15,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 110 interpolants. [2020-07-21 16:59:15,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2773, Invalid=9217, Unknown=0, NotChecked=0, Total=11990 [2020-07-21 16:59:15,066 INFO L87 Difference]: Start difference. First operand 302 states and 322 transitions. Second operand 110 states. [2020-07-21 16:59:20,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:59:20,870 INFO L93 Difference]: Finished difference Result 599 states and 727 transitions. [2020-07-21 16:59:20,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2020-07-21 16:59:20,870 INFO L78 Accepts]: Start accepts. Automaton has 110 states. Word has length 367 [2020-07-21 16:59:20,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:59:20,872 INFO L225 Difference]: With dead ends: 599 [2020-07-21 16:59:20,872 INFO L226 Difference]: Without dead ends: 448 [2020-07-21 16:59:20,875 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 769 GetRequests, 589 SyntacticMatches, 36 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5635 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=5473, Invalid=15697, Unknown=0, NotChecked=0, Total=21170 [2020-07-21 16:59:20,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 448 states. [2020-07-21 16:59:20,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 448 to 304. [2020-07-21 16:59:20,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 304 states. [2020-07-21 16:59:20,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 324 transitions. [2020-07-21 16:59:20,892 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 324 transitions. Word has length 367 [2020-07-21 16:59:20,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:59:20,892 INFO L479 AbstractCegarLoop]: Abstraction has 304 states and 324 transitions. [2020-07-21 16:59:20,892 INFO L480 AbstractCegarLoop]: Interpolant automaton has 110 states. [2020-07-21 16:59:20,892 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 324 transitions. [2020-07-21 16:59:20,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 370 [2020-07-21 16:59:20,895 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:59:20,896 INFO L422 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 36, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:59:21,109 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:21,110 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:59:21,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:59:21,111 INFO L82 PathProgramCache]: Analyzing trace with hash 1227173062, now seen corresponding path program 53 times [2020-07-21 16:59:21,111 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:59:21,111 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [837151758] [2020-07-21 16:59:21,111 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:21,264 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:59:21,264 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:59:21,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 998 conjuncts, 75 conjunts are in the unsatisfiable core [2020-07-21 16:59:21,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:59:22,578 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:59:22,716 INFO L134 CoverageAnalysis]: Checked inductivity of 6232 backedges. 1402 proven. 2450 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-21 16:59:22,716 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:59:22,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:59:25,342 INFO L134 CoverageAnalysis]: Checked inductivity of 6232 backedges. 1402 proven. 2450 refuted. 0 times theorem prover too weak. 2380 trivial. 0 not checked. [2020-07-21 16:59:25,342 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [837151758] [2020-07-21 16:59:25,342 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:59:25,343 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41] total 42 [2020-07-21 16:59:25,343 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [324150955] [2020-07-21 16:59:25,343 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-07-21 16:59:25,343 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:59:25,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-07-21 16:59:25,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=784, Invalid=938, Unknown=0, NotChecked=0, Total=1722 [2020-07-21 16:59:25,344 INFO L87 Difference]: Start difference. First operand 304 states and 324 transitions. Second operand 42 states. [2020-07-21 16:59:26,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:59:26,035 INFO L93 Difference]: Finished difference Result 323 states and 345 transitions. [2020-07-21 16:59:26,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-07-21 16:59:26,037 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 369 [2020-07-21 16:59:26,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:59:26,040 INFO L225 Difference]: With dead ends: 323 [2020-07-21 16:59:26,040 INFO L226 Difference]: Without dead ends: 321 [2020-07-21 16:59:26,041 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 738 GetRequests, 625 SyntacticMatches, 72 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1547 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=788, Invalid=1018, Unknown=0, NotChecked=0, Total=1806 [2020-07-21 16:59:26,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2020-07-21 16:59:26,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 316. [2020-07-21 16:59:26,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 316 states. [2020-07-21 16:59:26,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 337 transitions. [2020-07-21 16:59:26,052 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 337 transitions. Word has length 369 [2020-07-21 16:59:26,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:59:26,053 INFO L479 AbstractCegarLoop]: Abstraction has 316 states and 337 transitions. [2020-07-21 16:59:26,053 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-07-21 16:59:26,053 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 337 transitions. [2020-07-21 16:59:26,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 386 [2020-07-21 16:59:26,055 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:59:26,055 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 38, 37, 37, 37, 37, 37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:59:26,256 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:26,256 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:59:26,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:59:26,257 INFO L82 PathProgramCache]: Analyzing trace with hash 1586365096, now seen corresponding path program 54 times [2020-07-21 16:59:26,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:59:26,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1945291310] [2020-07-21 16:59:26,258 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:26,427 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:59:26,427 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:59:26,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 1032 conjuncts, 76 conjunts are in the unsatisfiable core [2020-07-21 16:59:26,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:59:30,652 INFO L134 CoverageAnalysis]: Checked inductivity of 6808 backedges. 2952 proven. 1332 refuted. 0 times theorem prover too weak. 2524 trivial. 0 not checked. [2020-07-21 16:59:30,653 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:59:35,638 INFO L134 CoverageAnalysis]: Checked inductivity of 6808 backedges. 2810 proven. 1332 refuted. 0 times theorem prover too weak. 2666 trivial. 0 not checked. [2020-07-21 16:59:35,639 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1945291310] [2020-07-21 16:59:35,639 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:59:35,639 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76] total 113 [2020-07-21 16:59:35,639 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721230203] [2020-07-21 16:59:35,640 INFO L459 AbstractCegarLoop]: Interpolant automaton has 113 states [2020-07-21 16:59:35,640 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:59:35,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2020-07-21 16:59:35,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2924, Invalid=9732, Unknown=0, NotChecked=0, Total=12656 [2020-07-21 16:59:35,641 INFO L87 Difference]: Start difference. First operand 316 states and 337 transitions. Second operand 113 states. [2020-07-21 16:59:41,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:59:41,141 INFO L93 Difference]: Finished difference Result 627 states and 759 transitions. [2020-07-21 16:59:41,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2020-07-21 16:59:41,141 INFO L78 Accepts]: Start accepts. Automaton has 113 states. Word has length 385 [2020-07-21 16:59:41,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:59:41,144 INFO L225 Difference]: With dead ends: 627 [2020-07-21 16:59:41,144 INFO L226 Difference]: Without dead ends: 466 [2020-07-21 16:59:41,146 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 806 GetRequests, 621 SyntacticMatches, 37 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5958 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=5773, Invalid=16577, Unknown=0, NotChecked=0, Total=22350 [2020-07-21 16:59:41,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 466 states. [2020-07-21 16:59:41,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 466 to 318. [2020-07-21 16:59:41,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 318 states. [2020-07-21 16:59:41,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 339 transitions. [2020-07-21 16:59:41,158 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 339 transitions. Word has length 385 [2020-07-21 16:59:41,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:59:41,158 INFO L479 AbstractCegarLoop]: Abstraction has 318 states and 339 transitions. [2020-07-21 16:59:41,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 113 states. [2020-07-21 16:59:41,158 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 339 transitions. [2020-07-21 16:59:41,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 388 [2020-07-21 16:59:41,160 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:59:41,160 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 38, 38, 37, 37, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:59:41,360 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:41,361 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:59:41,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:59:41,362 INFO L82 PathProgramCache]: Analyzing trace with hash -468415411, now seen corresponding path program 55 times [2020-07-21 16:59:41,362 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:59:41,362 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1088559212] [2020-07-21 16:59:41,362 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:41,538 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:59:41,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:59:41,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 1042 conjuncts, 78 conjunts are in the unsatisfiable core [2020-07-21 16:59:41,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:59:46,018 INFO L134 CoverageAnalysis]: Checked inductivity of 6882 backedges. 2812 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-21 16:59:46,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:59:51,498 INFO L134 CoverageAnalysis]: Checked inductivity of 6882 backedges. 2812 proven. 1406 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-21 16:59:51,498 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1088559212] [2020-07-21 16:59:51,499 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:59:51,499 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 78] total 116 [2020-07-21 16:59:51,499 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [829532827] [2020-07-21 16:59:51,500 INFO L459 AbstractCegarLoop]: Interpolant automaton has 116 states [2020-07-21 16:59:51,500 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:59:51,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2020-07-21 16:59:51,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3079, Invalid=10261, Unknown=0, NotChecked=0, Total=13340 [2020-07-21 16:59:51,501 INFO L87 Difference]: Start difference. First operand 318 states and 339 transitions. Second operand 116 states. [2020-07-21 16:59:57,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:59:57,739 INFO L93 Difference]: Finished difference Result 631 states and 766 transitions. [2020-07-21 16:59:57,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2020-07-21 16:59:57,739 INFO L78 Accepts]: Start accepts. Automaton has 116 states. Word has length 387 [2020-07-21 16:59:57,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:59:57,742 INFO L225 Difference]: With dead ends: 631 [2020-07-21 16:59:57,742 INFO L226 Difference]: Without dead ends: 472 [2020-07-21 16:59:57,744 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 811 GetRequests, 621 SyntacticMatches, 38 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6290 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=6081, Invalid=17481, Unknown=0, NotChecked=0, Total=23562 [2020-07-21 16:59:57,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2020-07-21 16:59:57,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 320. [2020-07-21 16:59:57,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 320 states. [2020-07-21 16:59:57,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 320 states to 320 states and 341 transitions. [2020-07-21 16:59:57,758 INFO L78 Accepts]: Start accepts. Automaton has 320 states and 341 transitions. Word has length 387 [2020-07-21 16:59:57,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:59:57,758 INFO L479 AbstractCegarLoop]: Abstraction has 320 states and 341 transitions. [2020-07-21 16:59:57,758 INFO L480 AbstractCegarLoop]: Interpolant automaton has 116 states. [2020-07-21 16:59:57,759 INFO L276 IsEmpty]: Start isEmpty. Operand 320 states and 341 transitions. [2020-07-21 16:59:57,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 390 [2020-07-21 16:59:57,761 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:59:57,761 INFO L422 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 38, 37, 37, 37, 37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:59:57,972 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:57,972 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:59:57,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:59:57,973 INFO L82 PathProgramCache]: Analyzing trace with hash 572473522, now seen corresponding path program 56 times [2020-07-21 16:59:57,973 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:59:57,974 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [454119022] [2020-07-21 16:59:57,974 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:59:58,138 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:59:58,139 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:59:58,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 1052 conjuncts, 79 conjunts are in the unsatisfiable core [2020-07-21 16:59:58,147 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:59:59,748 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 16:59:59,904 INFO L134 CoverageAnalysis]: Checked inductivity of 6958 backedges. 1556 proven. 2738 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-21 16:59:59,904 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:59:59,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 17:00:03,222 INFO L134 CoverageAnalysis]: Checked inductivity of 6958 backedges. 1556 proven. 2738 refuted. 0 times theorem prover too weak. 2664 trivial. 0 not checked. [2020-07-21 17:00:03,222 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [454119022] [2020-07-21 17:00:03,222 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:00:03,223 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43] total 44 [2020-07-21 17:00:03,223 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086905586] [2020-07-21 17:00:03,223 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-21 17:00:03,223 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:00:03,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-21 17:00:03,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=865, Invalid=1027, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 17:00:03,224 INFO L87 Difference]: Start difference. First operand 320 states and 341 transitions. Second operand 44 states. [2020-07-21 17:00:04,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:00:04,139 INFO L93 Difference]: Finished difference Result 339 states and 362 transitions. [2020-07-21 17:00:04,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-07-21 17:00:04,140 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 389 [2020-07-21 17:00:04,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:00:04,142 INFO L225 Difference]: With dead ends: 339 [2020-07-21 17:00:04,142 INFO L226 Difference]: Without dead ends: 337 [2020-07-21 17:00:04,143 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 778 GetRequests, 659 SyntacticMatches, 76 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1709 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=869, Invalid=1111, Unknown=0, NotChecked=0, Total=1980 [2020-07-21 17:00:04,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 337 states. [2020-07-21 17:00:04,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 337 to 332. [2020-07-21 17:00:04,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 332 states. [2020-07-21 17:00:04,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 354 transitions. [2020-07-21 17:00:04,155 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 354 transitions. Word has length 389 [2020-07-21 17:00:04,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:00:04,155 INFO L479 AbstractCegarLoop]: Abstraction has 332 states and 354 transitions. [2020-07-21 17:00:04,155 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-21 17:00:04,155 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 354 transitions. [2020-07-21 17:00:04,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 406 [2020-07-21 17:00:04,157 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:00:04,157 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 40, 39, 39, 39, 39, 39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:00:04,357 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:00:04,358 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:00:04,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:00:04,359 INFO L82 PathProgramCache]: Analyzing trace with hash -73744748, now seen corresponding path program 57 times [2020-07-21 17:00:04,359 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:00:04,359 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [964710072] [2020-07-21 17:00:04,360 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:00:04,521 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:00:04,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:00:04,525 INFO L263 TraceCheckSpWp]: Trace formula consists of 1086 conjuncts, 80 conjunts are in the unsatisfiable core [2020-07-21 17:00:04,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:00:09,716 INFO L134 CoverageAnalysis]: Checked inductivity of 7566 backedges. 3268 proven. 1482 refuted. 0 times theorem prover too weak. 2816 trivial. 0 not checked. [2020-07-21 17:00:09,717 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:00:15,857 INFO L134 CoverageAnalysis]: Checked inductivity of 7566 backedges. 3118 proven. 1482 refuted. 0 times theorem prover too weak. 2966 trivial. 0 not checked. [2020-07-21 17:00:15,857 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [964710072] [2020-07-21 17:00:15,858 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:00:15,858 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80] total 119 [2020-07-21 17:00:15,858 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297020978] [2020-07-21 17:00:15,859 INFO L459 AbstractCegarLoop]: Interpolant automaton has 119 states [2020-07-21 17:00:15,859 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:00:15,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2020-07-21 17:00:15,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3238, Invalid=10804, Unknown=0, NotChecked=0, Total=14042 [2020-07-21 17:00:15,860 INFO L87 Difference]: Start difference. First operand 332 states and 354 transitions. Second operand 119 states. [2020-07-21 17:00:23,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:00:23,242 INFO L93 Difference]: Finished difference Result 659 states and 798 transitions. [2020-07-21 17:00:23,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2020-07-21 17:00:23,242 INFO L78 Accepts]: Start accepts. Automaton has 119 states. Word has length 405 [2020-07-21 17:00:23,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:00:23,245 INFO L225 Difference]: With dead ends: 659 [2020-07-21 17:00:23,245 INFO L226 Difference]: Without dead ends: 490 [2020-07-21 17:00:23,247 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 848 GetRequests, 653 SyntacticMatches, 39 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6631 ImplicationChecksByTransitivity, 13.8s TimeCoverageRelationStatistics Valid=6397, Invalid=18409, Unknown=0, NotChecked=0, Total=24806 [2020-07-21 17:00:23,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2020-07-21 17:00:23,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 334. [2020-07-21 17:00:23,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 334 states. [2020-07-21 17:00:23,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 356 transitions. [2020-07-21 17:00:23,260 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 356 transitions. Word has length 405 [2020-07-21 17:00:23,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:00:23,260 INFO L479 AbstractCegarLoop]: Abstraction has 334 states and 356 transitions. [2020-07-21 17:00:23,260 INFO L480 AbstractCegarLoop]: Interpolant automaton has 119 states. [2020-07-21 17:00:23,260 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 356 transitions. [2020-07-21 17:00:23,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 408 [2020-07-21 17:00:23,265 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:00:23,265 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 40, 40, 39, 39, 39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:00:23,466 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:00:23,467 INFO L427 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:00:23,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:00:23,468 INFO L82 PathProgramCache]: Analyzing trace with hash 2082014137, now seen corresponding path program 58 times [2020-07-21 17:00:23,468 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:00:23,469 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [888334012] [2020-07-21 17:00:23,469 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:00:23,633 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:00:23,634 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:00:23,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 1096 conjuncts, 82 conjunts are in the unsatisfiable core [2020-07-21 17:00:23,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:00:29,390 INFO L134 CoverageAnalysis]: Checked inductivity of 7644 backedges. 3120 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-21 17:00:29,391 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:00:36,528 INFO L134 CoverageAnalysis]: Checked inductivity of 7644 backedges. 3120 proven. 1560 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-21 17:00:36,528 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [888334012] [2020-07-21 17:00:36,528 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:00:36,529 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [82, 82] total 122 [2020-07-21 17:00:36,529 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760587826] [2020-07-21 17:00:36,529 INFO L459 AbstractCegarLoop]: Interpolant automaton has 122 states [2020-07-21 17:00:36,530 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:00:36,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 122 interpolants. [2020-07-21 17:00:36,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3401, Invalid=11361, Unknown=0, NotChecked=0, Total=14762 [2020-07-21 17:00:36,531 INFO L87 Difference]: Start difference. First operand 334 states and 356 transitions. Second operand 122 states. [2020-07-21 17:00:44,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:00:44,502 INFO L93 Difference]: Finished difference Result 663 states and 805 transitions. [2020-07-21 17:00:44,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2020-07-21 17:00:44,502 INFO L78 Accepts]: Start accepts. Automaton has 122 states. Word has length 407 [2020-07-21 17:00:44,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:00:44,505 INFO L225 Difference]: With dead ends: 663 [2020-07-21 17:00:44,505 INFO L226 Difference]: Without dead ends: 496 [2020-07-21 17:00:44,510 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 853 GetRequests, 653 SyntacticMatches, 40 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6981 ImplicationChecksByTransitivity, 15.8s TimeCoverageRelationStatistics Valid=6721, Invalid=19361, Unknown=0, NotChecked=0, Total=26082 [2020-07-21 17:00:44,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 496 states. [2020-07-21 17:00:44,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 496 to 336. [2020-07-21 17:00:44,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 336 states. [2020-07-21 17:00:44,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 358 transitions. [2020-07-21 17:00:44,530 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 358 transitions. Word has length 407 [2020-07-21 17:00:44,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:00:44,530 INFO L479 AbstractCegarLoop]: Abstraction has 336 states and 358 transitions. [2020-07-21 17:00:44,530 INFO L480 AbstractCegarLoop]: Interpolant automaton has 122 states. [2020-07-21 17:00:44,530 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 358 transitions. [2020-07-21 17:00:44,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 410 [2020-07-21 17:00:44,532 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:00:44,533 INFO L422 BasicCegarLoop]: trace histogram [41, 40, 40, 40, 40, 39, 39, 39, 39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:00:44,733 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:00:44,734 INFO L427 AbstractCegarLoop]: === Iteration 62 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:00:44,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:00:44,734 INFO L82 PathProgramCache]: Analyzing trace with hash -702901346, now seen corresponding path program 59 times [2020-07-21 17:00:44,735 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:00:44,735 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1458365275] [2020-07-21 17:00:44,735 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:00:44,920 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:00:44,920 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:00:44,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 1106 conjuncts, 83 conjunts are in the unsatisfiable core [2020-07-21 17:00:44,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:00:46,987 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 17:00:47,195 INFO L134 CoverageAnalysis]: Checked inductivity of 7724 backedges. 1718 proven. 3042 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-21 17:00:47,195 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:00:47,301 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 17:00:51,584 INFO L134 CoverageAnalysis]: Checked inductivity of 7724 backedges. 1718 proven. 3042 refuted. 0 times theorem prover too weak. 2964 trivial. 0 not checked. [2020-07-21 17:00:51,584 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1458365275] [2020-07-21 17:00:51,584 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:00:51,585 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45] total 46 [2020-07-21 17:00:51,585 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [118504635] [2020-07-21 17:00:51,585 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-07-21 17:00:51,586 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:00:51,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-07-21 17:00:51,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=950, Invalid=1120, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 17:00:51,586 INFO L87 Difference]: Start difference. First operand 336 states and 358 transitions. Second operand 46 states. [2020-07-21 17:00:52,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:00:52,693 INFO L93 Difference]: Finished difference Result 355 states and 379 transitions. [2020-07-21 17:00:52,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-07-21 17:00:52,696 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 409 [2020-07-21 17:00:52,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:00:52,699 INFO L225 Difference]: With dead ends: 355 [2020-07-21 17:00:52,700 INFO L226 Difference]: Without dead ends: 353 [2020-07-21 17:00:52,700 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 818 GetRequests, 693 SyntacticMatches, 80 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1879 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=954, Invalid=1208, Unknown=0, NotChecked=0, Total=2162 [2020-07-21 17:00:52,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2020-07-21 17:00:52,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 348. [2020-07-21 17:00:52,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 348 states. [2020-07-21 17:00:52,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 371 transitions. [2020-07-21 17:00:52,720 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 371 transitions. Word has length 409 [2020-07-21 17:00:52,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:00:52,721 INFO L479 AbstractCegarLoop]: Abstraction has 348 states and 371 transitions. [2020-07-21 17:00:52,721 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-07-21 17:00:52,721 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 371 transitions. [2020-07-21 17:00:52,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 426 [2020-07-21 17:00:52,724 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:00:52,724 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 41, 41, 41, 41, 41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:00:52,925 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:00:52,925 INFO L427 AbstractCegarLoop]: === Iteration 63 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:00:52,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:00:52,926 INFO L82 PathProgramCache]: Analyzing trace with hash 524990848, now seen corresponding path program 60 times [2020-07-21 17:00:52,926 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:00:52,927 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1745370882] [2020-07-21 17:00:52,927 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:00:53,104 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:00:53,105 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:00:53,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 1140 conjuncts, 84 conjunts are in the unsatisfiable core [2020-07-21 17:00:53,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:01:00,043 INFO L134 CoverageAnalysis]: Checked inductivity of 8364 backedges. 3600 proven. 1640 refuted. 0 times theorem prover too weak. 3124 trivial. 0 not checked. [2020-07-21 17:01:00,043 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:01:08,496 INFO L134 CoverageAnalysis]: Checked inductivity of 8364 backedges. 3442 proven. 1640 refuted. 0 times theorem prover too weak. 3282 trivial. 0 not checked. [2020-07-21 17:01:08,497 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1745370882] [2020-07-21 17:01:08,497 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:01:08,497 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84] total 125 [2020-07-21 17:01:08,498 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782355176] [2020-07-21 17:01:08,498 INFO L459 AbstractCegarLoop]: Interpolant automaton has 125 states [2020-07-21 17:01:08,498 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:01:08,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2020-07-21 17:01:08,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3568, Invalid=11932, Unknown=0, NotChecked=0, Total=15500 [2020-07-21 17:01:08,500 INFO L87 Difference]: Start difference. First operand 348 states and 371 transitions. Second operand 125 states. [2020-07-21 17:01:18,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:01:18,350 INFO L93 Difference]: Finished difference Result 691 states and 837 transitions. [2020-07-21 17:01:18,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2020-07-21 17:01:18,350 INFO L78 Accepts]: Start accepts. Automaton has 125 states. Word has length 425 [2020-07-21 17:01:18,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:01:18,353 INFO L225 Difference]: With dead ends: 691 [2020-07-21 17:01:18,353 INFO L226 Difference]: Without dead ends: 514 [2020-07-21 17:01:18,356 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 890 GetRequests, 685 SyntacticMatches, 41 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7340 ImplicationChecksByTransitivity, 18.7s TimeCoverageRelationStatistics Valid=7053, Invalid=20337, Unknown=0, NotChecked=0, Total=27390 [2020-07-21 17:01:18,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 514 states. [2020-07-21 17:01:18,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 514 to 350. [2020-07-21 17:01:18,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 350 states. [2020-07-21 17:01:18,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 373 transitions. [2020-07-21 17:01:18,370 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 373 transitions. Word has length 425 [2020-07-21 17:01:18,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:01:18,371 INFO L479 AbstractCegarLoop]: Abstraction has 350 states and 373 transitions. [2020-07-21 17:01:18,371 INFO L480 AbstractCegarLoop]: Interpolant automaton has 125 states. [2020-07-21 17:01:18,371 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 373 transitions. [2020-07-21 17:01:18,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 428 [2020-07-21 17:01:18,373 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:01:18,373 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 42, 41, 41, 41, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:01:18,574 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:01:18,574 INFO L427 AbstractCegarLoop]: === Iteration 64 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:01:18,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:01:18,576 INFO L82 PathProgramCache]: Analyzing trace with hash -2129659355, now seen corresponding path program 61 times [2020-07-21 17:01:18,576 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:01:18,576 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [725211588] [2020-07-21 17:01:18,577 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:01:18,757 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:01:18,758 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:01:18,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 1150 conjuncts, 86 conjunts are in the unsatisfiable core [2020-07-21 17:01:18,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:01:26,494 INFO L134 CoverageAnalysis]: Checked inductivity of 8446 backedges. 3444 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-21 17:01:26,494 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:01:36,388 INFO L134 CoverageAnalysis]: Checked inductivity of 8446 backedges. 3444 proven. 1722 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-21 17:01:36,389 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [725211588] [2020-07-21 17:01:36,389 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:01:36,389 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [86, 86] total 128 [2020-07-21 17:01:36,389 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1849997609] [2020-07-21 17:01:36,390 INFO L459 AbstractCegarLoop]: Interpolant automaton has 128 states [2020-07-21 17:01:36,390 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:01:36,391 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 128 interpolants. [2020-07-21 17:01:36,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3739, Invalid=12517, Unknown=0, NotChecked=0, Total=16256 [2020-07-21 17:01:36,393 INFO L87 Difference]: Start difference. First operand 350 states and 373 transitions. Second operand 128 states. [2020-07-21 17:01:47,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:01:47,695 INFO L93 Difference]: Finished difference Result 695 states and 844 transitions. [2020-07-21 17:01:47,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2020-07-21 17:01:47,696 INFO L78 Accepts]: Start accepts. Automaton has 128 states. Word has length 427 [2020-07-21 17:01:47,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:01:47,699 INFO L225 Difference]: With dead ends: 695 [2020-07-21 17:01:47,699 INFO L226 Difference]: Without dead ends: 520 [2020-07-21 17:01:47,702 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 895 GetRequests, 685 SyntacticMatches, 42 SemanticMatches, 168 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7708 ImplicationChecksByTransitivity, 21.6s TimeCoverageRelationStatistics Valid=7393, Invalid=21337, Unknown=0, NotChecked=0, Total=28730 [2020-07-21 17:01:47,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2020-07-21 17:01:47,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 352. [2020-07-21 17:01:47,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 352 states. [2020-07-21 17:01:47,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 352 states to 352 states and 375 transitions. [2020-07-21 17:01:47,725 INFO L78 Accepts]: Start accepts. Automaton has 352 states and 375 transitions. Word has length 427 [2020-07-21 17:01:47,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:01:47,725 INFO L479 AbstractCegarLoop]: Abstraction has 352 states and 375 transitions. [2020-07-21 17:01:47,725 INFO L480 AbstractCegarLoop]: Interpolant automaton has 128 states. [2020-07-21 17:01:47,726 INFO L276 IsEmpty]: Start isEmpty. Operand 352 states and 375 transitions. [2020-07-21 17:01:47,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 430 [2020-07-21 17:01:47,729 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:01:47,730 INFO L422 BasicCegarLoop]: trace histogram [43, 42, 42, 42, 42, 41, 41, 41, 41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:01:47,943 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:01:47,944 INFO L427 AbstractCegarLoop]: === Iteration 65 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:01:47,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:01:47,945 INFO L82 PathProgramCache]: Analyzing trace with hash -2037930614, now seen corresponding path program 62 times [2020-07-21 17:01:47,945 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:01:47,946 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1467785415] [2020-07-21 17:01:47,946 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:01:48,132 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:01:48,133 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:01:48,139 INFO L263 TraceCheckSpWp]: Trace formula consists of 1160 conjuncts, 87 conjunts are in the unsatisfiable core [2020-07-21 17:01:48,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:01:51,008 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 17:01:51,262 INFO L134 CoverageAnalysis]: Checked inductivity of 8530 backedges. 1888 proven. 3362 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-21 17:01:51,262 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:01:51,400 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 17:01:57,250 INFO L134 CoverageAnalysis]: Checked inductivity of 8530 backedges. 1888 proven. 3362 refuted. 0 times theorem prover too weak. 3280 trivial. 0 not checked. [2020-07-21 17:01:57,251 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1467785415] [2020-07-21 17:01:57,251 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:01:57,251 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47] total 48 [2020-07-21 17:01:57,251 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1777694839] [2020-07-21 17:01:57,252 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-21 17:01:57,252 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:01:57,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-21 17:01:57,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1039, Invalid=1217, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 17:01:57,253 INFO L87 Difference]: Start difference. First operand 352 states and 375 transitions. Second operand 48 states. [2020-07-21 17:01:58,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:01:58,740 INFO L93 Difference]: Finished difference Result 371 states and 396 transitions. [2020-07-21 17:01:58,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-21 17:01:58,743 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 429 [2020-07-21 17:01:58,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:01:58,746 INFO L225 Difference]: With dead ends: 371 [2020-07-21 17:01:58,746 INFO L226 Difference]: Without dead ends: 369 [2020-07-21 17:01:58,747 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 858 GetRequests, 727 SyntacticMatches, 84 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2057 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=1043, Invalid=1309, Unknown=0, NotChecked=0, Total=2352 [2020-07-21 17:01:58,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2020-07-21 17:01:58,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 364. [2020-07-21 17:01:58,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 364 states. [2020-07-21 17:01:58,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 388 transitions. [2020-07-21 17:01:58,763 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 388 transitions. Word has length 429 [2020-07-21 17:01:58,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:01:58,764 INFO L479 AbstractCegarLoop]: Abstraction has 364 states and 388 transitions. [2020-07-21 17:01:58,764 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-21 17:01:58,764 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 388 transitions. [2020-07-21 17:01:58,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 446 [2020-07-21 17:01:58,766 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:01:58,766 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 44, 43, 43, 43, 43, 43, 43, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:01:58,967 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:01:58,968 INFO L427 AbstractCegarLoop]: === Iteration 66 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:01:58,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:01:58,969 INFO L82 PathProgramCache]: Analyzing trace with hash -99716244, now seen corresponding path program 63 times [2020-07-21 17:01:58,969 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:01:58,969 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [436937362] [2020-07-21 17:01:58,970 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:01:59,178 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:01:59,178 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:01:59,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 1194 conjuncts, 88 conjunts are in the unsatisfiable core [2020-07-21 17:01:59,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:02:08,432 INFO L134 CoverageAnalysis]: Checked inductivity of 9202 backedges. 3948 proven. 1806 refuted. 0 times theorem prover too weak. 3448 trivial. 0 not checked. [2020-07-21 17:02:08,432 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:02:19,660 INFO L134 CoverageAnalysis]: Checked inductivity of 9202 backedges. 3782 proven. 1806 refuted. 0 times theorem prover too weak. 3614 trivial. 0 not checked. [2020-07-21 17:02:19,660 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [436937362] [2020-07-21 17:02:19,660 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:02:19,661 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 88] total 131 [2020-07-21 17:02:19,661 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379739642] [2020-07-21 17:02:19,662 INFO L459 AbstractCegarLoop]: Interpolant automaton has 131 states [2020-07-21 17:02:19,662 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:02:19,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2020-07-21 17:02:19,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3914, Invalid=13116, Unknown=0, NotChecked=0, Total=17030 [2020-07-21 17:02:19,664 INFO L87 Difference]: Start difference. First operand 364 states and 388 transitions. Second operand 131 states. [2020-07-21 17:02:31,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:02:31,512 INFO L93 Difference]: Finished difference Result 723 states and 876 transitions. [2020-07-21 17:02:31,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2020-07-21 17:02:31,512 INFO L78 Accepts]: Start accepts. Automaton has 131 states. Word has length 445 [2020-07-21 17:02:31,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:02:31,515 INFO L225 Difference]: With dead ends: 723 [2020-07-21 17:02:31,515 INFO L226 Difference]: Without dead ends: 538 [2020-07-21 17:02:31,518 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 932 GetRequests, 717 SyntacticMatches, 43 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8085 ImplicationChecksByTransitivity, 24.6s TimeCoverageRelationStatistics Valid=7741, Invalid=22361, Unknown=0, NotChecked=0, Total=30102 [2020-07-21 17:02:31,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 538 states. [2020-07-21 17:02:31,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 538 to 366. [2020-07-21 17:02:31,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 366 states. [2020-07-21 17:02:31,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 366 states to 366 states and 390 transitions. [2020-07-21 17:02:31,534 INFO L78 Accepts]: Start accepts. Automaton has 366 states and 390 transitions. Word has length 445 [2020-07-21 17:02:31,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:02:31,534 INFO L479 AbstractCegarLoop]: Abstraction has 366 states and 390 transitions. [2020-07-21 17:02:31,534 INFO L480 AbstractCegarLoop]: Interpolant automaton has 131 states. [2020-07-21 17:02:31,534 INFO L276 IsEmpty]: Start isEmpty. Operand 366 states and 390 transitions. [2020-07-21 17:02:31,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 448 [2020-07-21 17:02:31,537 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:02:31,538 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 44, 44, 43, 43, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:02:31,746 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:02:31,747 INFO L427 AbstractCegarLoop]: === Iteration 67 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:02:31,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:02:31,748 INFO L82 PathProgramCache]: Analyzing trace with hash 592048017, now seen corresponding path program 64 times [2020-07-21 17:02:31,748 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:02:31,748 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [300594591] [2020-07-21 17:02:31,748 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:02:31,939 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:02:31,939 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:02:31,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 1204 conjuncts, 90 conjunts are in the unsatisfiable core [2020-07-21 17:02:31,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:02:42,091 INFO L134 CoverageAnalysis]: Checked inductivity of 9288 backedges. 3784 proven. 1892 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-21 17:02:42,091 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:02:54,188 INFO L134 CoverageAnalysis]: Checked inductivity of 9288 backedges. 3784 proven. 1892 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-21 17:02:54,188 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [300594591] [2020-07-21 17:02:54,189 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:02:54,189 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 90] total 134 [2020-07-21 17:02:54,189 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759664647] [2020-07-21 17:02:54,190 INFO L459 AbstractCegarLoop]: Interpolant automaton has 134 states [2020-07-21 17:02:54,190 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:02:54,191 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2020-07-21 17:02:54,191 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4093, Invalid=13729, Unknown=0, NotChecked=0, Total=17822 [2020-07-21 17:02:54,191 INFO L87 Difference]: Start difference. First operand 366 states and 390 transitions. Second operand 134 states. [2020-07-21 17:03:08,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:03:08,412 INFO L93 Difference]: Finished difference Result 727 states and 883 transitions. [2020-07-21 17:03:08,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2020-07-21 17:03:08,412 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 447 [2020-07-21 17:03:08,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:03:08,415 INFO L225 Difference]: With dead ends: 727 [2020-07-21 17:03:08,415 INFO L226 Difference]: Without dead ends: 544 [2020-07-21 17:03:08,417 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 937 GetRequests, 717 SyntacticMatches, 44 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8471 ImplicationChecksByTransitivity, 27.0s TimeCoverageRelationStatistics Valid=8097, Invalid=23409, Unknown=0, NotChecked=0, Total=31506 [2020-07-21 17:03:08,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 544 states. [2020-07-21 17:03:08,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 544 to 368. [2020-07-21 17:03:08,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2020-07-21 17:03:08,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 392 transitions. [2020-07-21 17:03:08,439 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 392 transitions. Word has length 447 [2020-07-21 17:03:08,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:03:08,439 INFO L479 AbstractCegarLoop]: Abstraction has 368 states and 392 transitions. [2020-07-21 17:03:08,439 INFO L480 AbstractCegarLoop]: Interpolant automaton has 134 states. [2020-07-21 17:03:08,439 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 392 transitions. [2020-07-21 17:03:08,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 450 [2020-07-21 17:03:08,442 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:03:08,442 INFO L422 BasicCegarLoop]: trace histogram [45, 44, 44, 44, 44, 43, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:03:08,642 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:03:08,643 INFO L427 AbstractCegarLoop]: === Iteration 68 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:03:08,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:03:08,644 INFO L82 PathProgramCache]: Analyzing trace with hash -342428042, now seen corresponding path program 65 times [2020-07-21 17:03:08,644 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:03:08,645 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [465250146] [2020-07-21 17:03:08,645 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:03:08,875 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:03:08,876 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:03:08,884 INFO L263 TraceCheckSpWp]: Trace formula consists of 1214 conjuncts, 91 conjunts are in the unsatisfiable core [2020-07-21 17:03:08,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:03:12,496 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 17:03:13,032 INFO L134 CoverageAnalysis]: Checked inductivity of 9376 backedges. 2066 proven. 3698 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-21 17:03:13,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:03:13,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 17:03:20,429 INFO L134 CoverageAnalysis]: Checked inductivity of 9376 backedges. 2066 proven. 3698 refuted. 0 times theorem prover too weak. 3612 trivial. 0 not checked. [2020-07-21 17:03:20,430 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [465250146] [2020-07-21 17:03:20,430 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:03:20,430 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 50 [2020-07-21 17:03:20,431 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049479630] [2020-07-21 17:03:20,431 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-21 17:03:20,431 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:03:20,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-21 17:03:20,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1132, Invalid=1318, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 17:03:20,432 INFO L87 Difference]: Start difference. First operand 368 states and 392 transitions. Second operand 50 states. [2020-07-21 17:03:22,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:03:22,330 INFO L93 Difference]: Finished difference Result 387 states and 413 transitions. [2020-07-21 17:03:22,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-21 17:03:22,333 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 449 [2020-07-21 17:03:22,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:03:22,336 INFO L225 Difference]: With dead ends: 387 [2020-07-21 17:03:22,336 INFO L226 Difference]: Without dead ends: 385 [2020-07-21 17:03:22,337 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 898 GetRequests, 761 SyntacticMatches, 88 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2243 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=1136, Invalid=1414, Unknown=0, NotChecked=0, Total=2550 [2020-07-21 17:03:22,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2020-07-21 17:03:22,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 380. [2020-07-21 17:03:22,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 380 states. [2020-07-21 17:03:22,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 380 states to 380 states and 405 transitions. [2020-07-21 17:03:22,353 INFO L78 Accepts]: Start accepts. Automaton has 380 states and 405 transitions. Word has length 449 [2020-07-21 17:03:22,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:03:22,353 INFO L479 AbstractCegarLoop]: Abstraction has 380 states and 405 transitions. [2020-07-21 17:03:22,353 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-21 17:03:22,353 INFO L276 IsEmpty]: Start isEmpty. Operand 380 states and 405 transitions. [2020-07-21 17:03:22,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 466 [2020-07-21 17:03:22,356 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:03:22,356 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 46, 45, 45, 45, 45, 45, 45, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:03:22,556 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:03:22,557 INFO L427 AbstractCegarLoop]: === Iteration 69 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:03:22,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:03:22,558 INFO L82 PathProgramCache]: Analyzing trace with hash -753505192, now seen corresponding path program 66 times [2020-07-21 17:03:22,558 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:03:22,558 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1579978399] [2020-07-21 17:03:22,559 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:03:22,763 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:03:22,764 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:03:22,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 1248 conjuncts, 92 conjunts are in the unsatisfiable core [2020-07-21 17:03:22,775 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:03:33,873 INFO L134 CoverageAnalysis]: Checked inductivity of 10080 backedges. 4312 proven. 1980 refuted. 0 times theorem prover too weak. 3788 trivial. 0 not checked. [2020-07-21 17:03:33,874 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:03:47,275 INFO L134 CoverageAnalysis]: Checked inductivity of 10080 backedges. 4138 proven. 1980 refuted. 0 times theorem prover too weak. 3962 trivial. 0 not checked. [2020-07-21 17:03:47,276 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1579978399] [2020-07-21 17:03:47,276 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:03:47,276 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 92] total 137 [2020-07-21 17:03:47,277 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22243491] [2020-07-21 17:03:47,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 137 states [2020-07-21 17:03:47,278 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:03:47,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 137 interpolants. [2020-07-21 17:03:47,280 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4276, Invalid=14356, Unknown=0, NotChecked=0, Total=18632 [2020-07-21 17:03:47,280 INFO L87 Difference]: Start difference. First operand 380 states and 405 transitions. Second operand 137 states. [2020-07-21 17:04:02,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:04:02,694 INFO L93 Difference]: Finished difference Result 755 states and 915 transitions. [2020-07-21 17:04:02,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2020-07-21 17:04:02,694 INFO L78 Accepts]: Start accepts. Automaton has 137 states. Word has length 465 [2020-07-21 17:04:02,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:04:02,697 INFO L225 Difference]: With dead ends: 755 [2020-07-21 17:04:02,697 INFO L226 Difference]: Without dead ends: 562 [2020-07-21 17:04:02,701 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 974 GetRequests, 749 SyntacticMatches, 45 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8866 ImplicationChecksByTransitivity, 30.1s TimeCoverageRelationStatistics Valid=8461, Invalid=24481, Unknown=0, NotChecked=0, Total=32942 [2020-07-21 17:04:02,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 562 states. [2020-07-21 17:04:02,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 562 to 382. [2020-07-21 17:04:02,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 382 states. [2020-07-21 17:04:02,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 407 transitions. [2020-07-21 17:04:02,719 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 407 transitions. Word has length 465 [2020-07-21 17:04:02,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:04:02,720 INFO L479 AbstractCegarLoop]: Abstraction has 382 states and 407 transitions. [2020-07-21 17:04:02,720 INFO L480 AbstractCegarLoop]: Interpolant automaton has 137 states. [2020-07-21 17:04:02,720 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 407 transitions. [2020-07-21 17:04:02,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 468 [2020-07-21 17:04:02,724 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:04:02,724 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 46, 46, 45, 45, 45, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:04:02,938 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:04:02,939 INFO L427 AbstractCegarLoop]: === Iteration 70 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:04:02,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:04:02,940 INFO L82 PathProgramCache]: Analyzing trace with hash -103324675, now seen corresponding path program 67 times [2020-07-21 17:04:02,940 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:04:02,941 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1817803877] [2020-07-21 17:04:02,941 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:04:03,140 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:04:03,141 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:04:03,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 1258 conjuncts, 94 conjunts are in the unsatisfiable core [2020-07-21 17:04:03,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:04:15,907 INFO L134 CoverageAnalysis]: Checked inductivity of 10170 backedges. 4140 proven. 2070 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-21 17:04:15,907 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:04:31,444 INFO L134 CoverageAnalysis]: Checked inductivity of 10170 backedges. 4140 proven. 2070 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-21 17:04:31,445 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1817803877] [2020-07-21 17:04:31,445 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:04:31,445 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [94, 94] total 140 [2020-07-21 17:04:31,445 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108171153] [2020-07-21 17:04:31,446 INFO L459 AbstractCegarLoop]: Interpolant automaton has 140 states [2020-07-21 17:04:31,446 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:04:31,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2020-07-21 17:04:31,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4463, Invalid=14997, Unknown=0, NotChecked=0, Total=19460 [2020-07-21 17:04:31,448 INFO L87 Difference]: Start difference. First operand 382 states and 407 transitions. Second operand 140 states. [2020-07-21 17:04:48,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:04:48,029 INFO L93 Difference]: Finished difference Result 759 states and 922 transitions. [2020-07-21 17:04:48,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2020-07-21 17:04:48,030 INFO L78 Accepts]: Start accepts. Automaton has 140 states. Word has length 467 [2020-07-21 17:04:48,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:04:48,032 INFO L225 Difference]: With dead ends: 759 [2020-07-21 17:04:48,032 INFO L226 Difference]: Without dead ends: 568 [2020-07-21 17:04:48,034 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 979 GetRequests, 749 SyntacticMatches, 46 SemanticMatches, 184 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9270 ImplicationChecksByTransitivity, 34.2s TimeCoverageRelationStatistics Valid=8833, Invalid=25577, Unknown=0, NotChecked=0, Total=34410 [2020-07-21 17:04:48,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 568 states. [2020-07-21 17:04:48,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 568 to 384. [2020-07-21 17:04:48,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 384 states. [2020-07-21 17:04:48,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 384 states to 384 states and 409 transitions. [2020-07-21 17:04:48,051 INFO L78 Accepts]: Start accepts. Automaton has 384 states and 409 transitions. Word has length 467 [2020-07-21 17:04:48,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:04:48,051 INFO L479 AbstractCegarLoop]: Abstraction has 384 states and 409 transitions. [2020-07-21 17:04:48,051 INFO L480 AbstractCegarLoop]: Interpolant automaton has 140 states. [2020-07-21 17:04:48,051 INFO L276 IsEmpty]: Start isEmpty. Operand 384 states and 409 transitions. [2020-07-21 17:04:48,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 470 [2020-07-21 17:04:48,054 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:04:48,054 INFO L422 BasicCegarLoop]: trace histogram [47, 46, 46, 46, 46, 45, 45, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:04:48,254 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:04:48,255 INFO L427 AbstractCegarLoop]: === Iteration 71 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:04:48,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:04:48,256 INFO L82 PathProgramCache]: Analyzing trace with hash 1949894242, now seen corresponding path program 68 times [2020-07-21 17:04:48,256 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:04:48,256 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [963278750] [2020-07-21 17:04:48,257 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:04:48,460 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:04:48,461 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:04:48,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 1268 conjuncts, 95 conjunts are in the unsatisfiable core [2020-07-21 17:04:48,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:04:52,932 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 17:04:53,270 INFO L134 CoverageAnalysis]: Checked inductivity of 10262 backedges. 2252 proven. 4050 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-21 17:04:53,271 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:04:53,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 17:05:02,526 INFO L134 CoverageAnalysis]: Checked inductivity of 10262 backedges. 2252 proven. 4050 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-21 17:05:02,527 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [963278750] [2020-07-21 17:05:02,527 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:05:02,527 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51] total 52 [2020-07-21 17:05:02,527 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573337682] [2020-07-21 17:05:02,528 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-07-21 17:05:02,528 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:05:02,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-07-21 17:05:02,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1229, Invalid=1423, Unknown=0, NotChecked=0, Total=2652 [2020-07-21 17:05:02,529 INFO L87 Difference]: Start difference. First operand 384 states and 409 transitions. Second operand 52 states. [2020-07-21 17:05:04,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:05:04,779 INFO L93 Difference]: Finished difference Result 403 states and 430 transitions. [2020-07-21 17:05:04,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-07-21 17:05:04,783 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 469 [2020-07-21 17:05:04,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:05:04,787 INFO L225 Difference]: With dead ends: 403 [2020-07-21 17:05:04,787 INFO L226 Difference]: Without dead ends: 401 [2020-07-21 17:05:04,787 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 938 GetRequests, 795 SyntacticMatches, 92 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2437 ImplicationChecksByTransitivity, 12.9s TimeCoverageRelationStatistics Valid=1233, Invalid=1523, Unknown=0, NotChecked=0, Total=2756 [2020-07-21 17:05:04,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2020-07-21 17:05:04,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 396. [2020-07-21 17:05:04,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 396 states. [2020-07-21 17:05:04,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 396 states to 396 states and 422 transitions. [2020-07-21 17:05:04,803 INFO L78 Accepts]: Start accepts. Automaton has 396 states and 422 transitions. Word has length 469 [2020-07-21 17:05:04,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:05:04,804 INFO L479 AbstractCegarLoop]: Abstraction has 396 states and 422 transitions. [2020-07-21 17:05:04,804 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-07-21 17:05:04,804 INFO L276 IsEmpty]: Start isEmpty. Operand 396 states and 422 transitions. [2020-07-21 17:05:04,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 486 [2020-07-21 17:05:04,807 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:05:04,807 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 48, 47, 47, 47, 47, 47, 47, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:05:05,009 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:05:05,009 INFO L427 AbstractCegarLoop]: === Iteration 72 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:05:05,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:05:05,010 INFO L82 PathProgramCache]: Analyzing trace with hash 676537412, now seen corresponding path program 69 times [2020-07-21 17:05:05,010 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:05:05,010 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1950746952] [2020-07-21 17:05:05,011 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:05:05,204 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:05:05,204 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:05:05,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 1302 conjuncts, 96 conjunts are in the unsatisfiable core [2020-07-21 17:05:05,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:05:19,290 INFO L134 CoverageAnalysis]: Checked inductivity of 10998 backedges. 4692 proven. 2162 refuted. 0 times theorem prover too weak. 4144 trivial. 0 not checked. [2020-07-21 17:05:19,291 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:05:36,751 INFO L134 CoverageAnalysis]: Checked inductivity of 10998 backedges. 4510 proven. 2162 refuted. 0 times theorem prover too weak. 4326 trivial. 0 not checked. [2020-07-21 17:05:36,751 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1950746952] [2020-07-21 17:05:36,751 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:05:36,752 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96] total 143 [2020-07-21 17:05:36,752 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490784214] [2020-07-21 17:05:36,753 INFO L459 AbstractCegarLoop]: Interpolant automaton has 143 states [2020-07-21 17:05:36,753 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:05:36,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2020-07-21 17:05:36,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4654, Invalid=15652, Unknown=0, NotChecked=0, Total=20306 [2020-07-21 17:05:36,755 INFO L87 Difference]: Start difference. First operand 396 states and 422 transitions. Second operand 143 states. [2020-07-21 17:05:56,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:05:56,203 INFO L93 Difference]: Finished difference Result 787 states and 954 transitions. [2020-07-21 17:05:56,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2020-07-21 17:05:56,203 INFO L78 Accepts]: Start accepts. Automaton has 143 states. Word has length 485 [2020-07-21 17:05:56,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:05:56,206 INFO L225 Difference]: With dead ends: 787 [2020-07-21 17:05:56,206 INFO L226 Difference]: Without dead ends: 586 [2020-07-21 17:05:56,209 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1016 GetRequests, 781 SyntacticMatches, 47 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9683 ImplicationChecksByTransitivity, 38.5s TimeCoverageRelationStatistics Valid=9213, Invalid=26697, Unknown=0, NotChecked=0, Total=35910 [2020-07-21 17:05:56,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2020-07-21 17:05:56,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 398. [2020-07-21 17:05:56,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 398 states. [2020-07-21 17:05:56,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 398 states to 398 states and 424 transitions. [2020-07-21 17:05:56,226 INFO L78 Accepts]: Start accepts. Automaton has 398 states and 424 transitions. Word has length 485 [2020-07-21 17:05:56,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:05:56,226 INFO L479 AbstractCegarLoop]: Abstraction has 398 states and 424 transitions. [2020-07-21 17:05:56,226 INFO L480 AbstractCegarLoop]: Interpolant automaton has 143 states. [2020-07-21 17:05:56,226 INFO L276 IsEmpty]: Start isEmpty. Operand 398 states and 424 transitions. [2020-07-21 17:05:56,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-21 17:05:56,229 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:05:56,229 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 48, 48, 47, 47, 47, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:05:56,430 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:05:56,430 INFO L427 AbstractCegarLoop]: === Iteration 73 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:05:56,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:05:56,431 INFO L82 PathProgramCache]: Analyzing trace with hash 579393385, now seen corresponding path program 70 times [2020-07-21 17:05:56,431 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:05:56,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [263037566] [2020-07-21 17:05:56,432 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:05:56,644 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:05:56,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:05:56,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 1312 conjuncts, 98 conjunts are in the unsatisfiable core [2020-07-21 17:05:56,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:06:12,600 INFO L134 CoverageAnalysis]: Checked inductivity of 11092 backedges. 4512 proven. 2256 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-21 17:06:12,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:06:31,408 INFO L134 CoverageAnalysis]: Checked inductivity of 11092 backedges. 4512 proven. 2256 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-21 17:06:31,409 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [263037566] [2020-07-21 17:06:31,409 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:06:31,409 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98] total 146 [2020-07-21 17:06:31,409 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104034871] [2020-07-21 17:06:31,410 INFO L459 AbstractCegarLoop]: Interpolant automaton has 146 states [2020-07-21 17:06:31,410 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:06:31,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2020-07-21 17:06:31,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4849, Invalid=16321, Unknown=0, NotChecked=0, Total=21170 [2020-07-21 17:06:31,412 INFO L87 Difference]: Start difference. First operand 398 states and 424 transitions. Second operand 146 states. [2020-07-21 17:06:53,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:06:53,334 INFO L93 Difference]: Finished difference Result 791 states and 961 transitions. [2020-07-21 17:06:53,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2020-07-21 17:06:53,334 INFO L78 Accepts]: Start accepts. Automaton has 146 states. Word has length 487 [2020-07-21 17:06:53,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:06:53,338 INFO L225 Difference]: With dead ends: 791 [2020-07-21 17:06:53,339 INFO L226 Difference]: Without dead ends: 592 [2020-07-21 17:06:53,343 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 781 SyntacticMatches, 48 SemanticMatches, 192 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10105 ImplicationChecksByTransitivity, 42.4s TimeCoverageRelationStatistics Valid=9601, Invalid=27841, Unknown=0, NotChecked=0, Total=37442 [2020-07-21 17:06:53,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2020-07-21 17:06:53,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 400. [2020-07-21 17:06:53,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 400 states. [2020-07-21 17:06:53,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 426 transitions. [2020-07-21 17:06:53,373 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 426 transitions. Word has length 487 [2020-07-21 17:06:53,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:06:53,373 INFO L479 AbstractCegarLoop]: Abstraction has 400 states and 426 transitions. [2020-07-21 17:06:53,373 INFO L480 AbstractCegarLoop]: Interpolant automaton has 146 states. [2020-07-21 17:06:53,373 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 426 transitions. [2020-07-21 17:06:53,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2020-07-21 17:06:53,378 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:06:53,378 INFO L422 BasicCegarLoop]: trace histogram [49, 48, 48, 48, 48, 47, 47, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:06:53,593 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 74 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:06:53,594 INFO L427 AbstractCegarLoop]: === Iteration 74 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:06:53,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:06:53,595 INFO L82 PathProgramCache]: Analyzing trace with hash 1713263950, now seen corresponding path program 71 times [2020-07-21 17:06:53,595 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:06:53,596 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [576972967] [2020-07-21 17:06:53,596 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:06:53,946 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:06:53,946 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:06:53,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 1322 conjuncts, 99 conjunts are in the unsatisfiable core [2020-07-21 17:06:53,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:06:59,527 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 17:06:59,913 INFO L134 CoverageAnalysis]: Checked inductivity of 11188 backedges. 2446 proven. 4418 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-21 17:06:59,913 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:07:00,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 17:07:10,877 INFO L134 CoverageAnalysis]: Checked inductivity of 11188 backedges. 2446 proven. 4418 refuted. 0 times theorem prover too weak. 4324 trivial. 0 not checked. [2020-07-21 17:07:10,878 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [576972967] [2020-07-21 17:07:10,878 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:07:10,879 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53] total 54 [2020-07-21 17:07:10,879 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1844735451] [2020-07-21 17:07:10,879 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-07-21 17:07:10,880 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:07:10,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-07-21 17:07:10,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1330, Invalid=1532, Unknown=0, NotChecked=0, Total=2862 [2020-07-21 17:07:10,880 INFO L87 Difference]: Start difference. First operand 400 states and 426 transitions. Second operand 54 states. [2020-07-21 17:07:13,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:07:13,536 INFO L93 Difference]: Finished difference Result 419 states and 447 transitions. [2020-07-21 17:07:13,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-07-21 17:07:13,541 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 489 [2020-07-21 17:07:13,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:07:13,544 INFO L225 Difference]: With dead ends: 419 [2020-07-21 17:07:13,544 INFO L226 Difference]: Without dead ends: 417 [2020-07-21 17:07:13,545 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 978 GetRequests, 829 SyntacticMatches, 96 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2639 ImplicationChecksByTransitivity, 15.5s TimeCoverageRelationStatistics Valid=1334, Invalid=1636, Unknown=0, NotChecked=0, Total=2970 [2020-07-21 17:07:13,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 417 states. [2020-07-21 17:07:13,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 417 to 412. [2020-07-21 17:07:13,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 412 states. [2020-07-21 17:07:13,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 412 states to 412 states and 439 transitions. [2020-07-21 17:07:13,565 INFO L78 Accepts]: Start accepts. Automaton has 412 states and 439 transitions. Word has length 489 [2020-07-21 17:07:13,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:07:13,566 INFO L479 AbstractCegarLoop]: Abstraction has 412 states and 439 transitions. [2020-07-21 17:07:13,566 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-07-21 17:07:13,566 INFO L276 IsEmpty]: Start isEmpty. Operand 412 states and 439 transitions. [2020-07-21 17:07:13,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 506 [2020-07-21 17:07:13,569 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:07:13,569 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 50, 49, 49, 49, 49, 49, 49, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:07:13,769 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:07:13,770 INFO L427 AbstractCegarLoop]: === Iteration 75 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:07:13,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:07:13,771 INFO L82 PathProgramCache]: Analyzing trace with hash -831186128, now seen corresponding path program 72 times [2020-07-21 17:07:13,772 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:07:13,772 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [182253557] [2020-07-21 17:07:13,772 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:07:14,007 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:07:14,008 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:07:14,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 1356 conjuncts, 100 conjunts are in the unsatisfiable core [2020-07-21 17:07:14,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:07:31,773 INFO L134 CoverageAnalysis]: Checked inductivity of 11956 backedges. 5088 proven. 2352 refuted. 0 times theorem prover too weak. 4516 trivial. 0 not checked. [2020-07-21 17:07:31,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:07:53,038 INFO L134 CoverageAnalysis]: Checked inductivity of 11956 backedges. 4898 proven. 2352 refuted. 0 times theorem prover too weak. 4706 trivial. 0 not checked. [2020-07-21 17:07:53,039 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [182253557] [2020-07-21 17:07:53,039 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:07:53,039 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 100] total 149 [2020-07-21 17:07:53,040 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176330294] [2020-07-21 17:07:53,040 INFO L459 AbstractCegarLoop]: Interpolant automaton has 149 states [2020-07-21 17:07:53,041 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:07:53,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 149 interpolants. [2020-07-21 17:07:53,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5048, Invalid=17004, Unknown=0, NotChecked=0, Total=22052 [2020-07-21 17:07:53,043 INFO L87 Difference]: Start difference. First operand 412 states and 439 transitions. Second operand 149 states. [2020-07-21 17:08:16,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:08:16,313 INFO L93 Difference]: Finished difference Result 819 states and 993 transitions. [2020-07-21 17:08:16,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2020-07-21 17:08:16,313 INFO L78 Accepts]: Start accepts. Automaton has 149 states. Word has length 505 [2020-07-21 17:08:16,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:08:16,316 INFO L225 Difference]: With dead ends: 819 [2020-07-21 17:08:16,316 INFO L226 Difference]: Without dead ends: 610 [2020-07-21 17:08:16,319 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1058 GetRequests, 813 SyntacticMatches, 49 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10536 ImplicationChecksByTransitivity, 47.6s TimeCoverageRelationStatistics Valid=9997, Invalid=29009, Unknown=0, NotChecked=0, Total=39006 [2020-07-21 17:08:16,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 610 states. [2020-07-21 17:08:16,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 610 to 414. [2020-07-21 17:08:16,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 414 states. [2020-07-21 17:08:16,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 414 states to 414 states and 441 transitions. [2020-07-21 17:08:16,338 INFO L78 Accepts]: Start accepts. Automaton has 414 states and 441 transitions. Word has length 505 [2020-07-21 17:08:16,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:08:16,338 INFO L479 AbstractCegarLoop]: Abstraction has 414 states and 441 transitions. [2020-07-21 17:08:16,338 INFO L480 AbstractCegarLoop]: Interpolant automaton has 149 states. [2020-07-21 17:08:16,338 INFO L276 IsEmpty]: Start isEmpty. Operand 414 states and 441 transitions. [2020-07-21 17:08:16,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-21 17:08:16,343 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:08:16,343 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 50, 50, 49, 49, 49, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:08:16,557 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:08:16,558 INFO L427 AbstractCegarLoop]: === Iteration 76 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:08:16,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:08:16,559 INFO L82 PathProgramCache]: Analyzing trace with hash 1643039189, now seen corresponding path program 73 times [2020-07-21 17:08:16,559 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:08:16,560 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1079920706] [2020-07-21 17:08:16,560 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:08:16,780 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:08:16,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:08:16,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 1366 conjuncts, 102 conjunts are in the unsatisfiable core [2020-07-21 17:08:16,797 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:08:36,203 INFO L134 CoverageAnalysis]: Checked inductivity of 12054 backedges. 4900 proven. 2450 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-21 17:08:36,204 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:08:59,726 INFO L134 CoverageAnalysis]: Checked inductivity of 12054 backedges. 4900 proven. 2450 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-21 17:08:59,727 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1079920706] [2020-07-21 17:08:59,727 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 17:08:59,727 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [102, 102] total 152 [2020-07-21 17:08:59,727 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846997367] [2020-07-21 17:08:59,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 152 states [2020-07-21 17:08:59,728 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 17:08:59,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2020-07-21 17:08:59,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5251, Invalid=17701, Unknown=0, NotChecked=0, Total=22952 [2020-07-21 17:08:59,731 INFO L87 Difference]: Start difference. First operand 414 states and 441 transitions. Second operand 152 states. [2020-07-21 17:09:26,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 17:09:26,139 INFO L93 Difference]: Finished difference Result 823 states and 1000 transitions. [2020-07-21 17:09:26,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2020-07-21 17:09:26,140 INFO L78 Accepts]: Start accepts. Automaton has 152 states. Word has length 507 [2020-07-21 17:09:26,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 17:09:26,144 INFO L225 Difference]: With dead ends: 823 [2020-07-21 17:09:26,144 INFO L226 Difference]: Without dead ends: 616 [2020-07-21 17:09:26,148 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1063 GetRequests, 813 SyntacticMatches, 50 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10976 ImplicationChecksByTransitivity, 52.3s TimeCoverageRelationStatistics Valid=10401, Invalid=30201, Unknown=0, NotChecked=0, Total=40602 [2020-07-21 17:09:26,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 616 states. [2020-07-21 17:09:26,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 616 to 416. [2020-07-21 17:09:26,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 416 states. [2020-07-21 17:09:26,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 416 states to 416 states and 443 transitions. [2020-07-21 17:09:26,178 INFO L78 Accepts]: Start accepts. Automaton has 416 states and 443 transitions. Word has length 507 [2020-07-21 17:09:26,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 17:09:26,179 INFO L479 AbstractCegarLoop]: Abstraction has 416 states and 443 transitions. [2020-07-21 17:09:26,179 INFO L480 AbstractCegarLoop]: Interpolant automaton has 152 states. [2020-07-21 17:09:26,179 INFO L276 IsEmpty]: Start isEmpty. Operand 416 states and 443 transitions. [2020-07-21 17:09:26,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 510 [2020-07-21 17:09:26,183 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 17:09:26,184 INFO L422 BasicCegarLoop]: trace histogram [51, 50, 50, 50, 50, 49, 49, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 17:09:26,400 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:09:26,401 INFO L427 AbstractCegarLoop]: === Iteration 77 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 17:09:26,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 17:09:26,402 INFO L82 PathProgramCache]: Analyzing trace with hash -38313158, now seen corresponding path program 74 times [2020-07-21 17:09:26,402 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 17:09:26,403 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1330827347] [2020-07-21 17:09:26,403 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 17:09:26,627 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 17:09:26,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 17:09:26,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 1376 conjuncts, 103 conjunts are in the unsatisfiable core [2020-07-21 17:09:26,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 17:09:33,411 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-21 17:09:33,849 INFO L134 CoverageAnalysis]: Checked inductivity of 12154 backedges. 2648 proven. 4802 refuted. 0 times theorem prover too weak. 4704 trivial. 0 not checked. [2020-07-21 17:09:33,850 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 17:09:34,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts