/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/jm2006.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 17:58:41,570 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 17:58:41,573 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 17:58:41,585 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 17:58:41,586 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 17:58:41,587 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 17:58:41,588 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 17:58:41,590 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 17:58:41,591 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 17:58:41,592 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 17:58:41,593 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 17:58:41,594 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 17:58:41,594 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 17:58:41,595 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 17:58:41,596 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 17:58:41,598 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 17:58:41,598 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 17:58:41,599 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 17:58:41,601 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 17:58:41,603 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 17:58:41,605 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 17:58:41,606 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 17:58:41,607 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 17:58:41,608 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 17:58:41,610 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 17:58:41,618 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 17:58:41,619 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 17:58:41,619 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 17:58:41,620 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 17:58:41,642 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 17:58:41,643 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 17:58:41,644 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 17:58:41,644 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 17:58:41,644 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 17:58:41,645 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 17:58:41,645 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 17:58:41,645 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 17:58:41,645 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 17:58:41,646 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 17:58:41,646 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 17:58:41,646 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 17:58:41,646 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 17:58:41,647 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 17:58:41,647 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 17:58:41,647 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 17:58:41,647 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 17:58:41,648 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 17:58:41,648 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 17:58:41,648 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 17:58:41,648 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 17:58:41,649 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:58:41,649 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 17:58:41,649 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 17:58:41,649 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 17:58:41,650 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 17:58:41,650 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:41,650 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 17:58:41,651 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 17:58:41,651 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 17:58:41,956 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 17:58:41,973 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 17:58:41,977 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 17:58:41,978 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 17:58:41,981 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 17:58:41,981 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/jm2006.i [2020-07-20 17:58:42,052 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/142d5ccc7/6b816a9675304d1a81db71dd8f6c6bd8/FLAG4690cb756 [2020-07-20 17:58:42,522 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 17:58:42,523 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/jm2006.i [2020-07-20 17:58:42,529 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/142d5ccc7/6b816a9675304d1a81db71dd8f6c6bd8/FLAG4690cb756 [2020-07-20 17:58:42,893 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/142d5ccc7/6b816a9675304d1a81db71dd8f6c6bd8 [2020-07-20 17:58:42,903 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 17:58:42,905 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 17:58:42,906 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 17:58:42,906 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 17:58:42,910 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 17:58:42,912 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:58:42" (1/1) ... [2020-07-20 17:58:42,915 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@437af1d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:58:42, skipping insertion in model container [2020-07-20 17:58:42,916 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:58:42" (1/1) ... [2020-07-20 17:58:42,925 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 17:58:42,942 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 17:58:43,114 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:58:43,118 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 17:58:43,136 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:58:43,151 INFO L208 MainTranslator]: Completed translation [2020-07-20 17:58:43,151 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:58:43 WrapperNode [2020-07-20 17:58:43,152 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 17:58:43,152 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 17:58:43,153 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 17:58:43,153 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 17:58:43,166 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:58:43" (1/1) ... [2020-07-20 17:58:43,167 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:58:43" (1/1) ... [2020-07-20 17:58:43,172 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:58:43" (1/1) ... [2020-07-20 17:58:43,173 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:58:43" (1/1) ... [2020-07-20 17:58:43,177 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:58:43" (1/1) ... [2020-07-20 17:58:43,182 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:58:43" (1/1) ... [2020-07-20 17:58:43,183 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:58:43" (1/1) ... [2020-07-20 17:58:43,184 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 17:58:43,185 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 17:58:43,185 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 17:58:43,185 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 17:58:43,186 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:58:43" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:58:43,328 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 17:58:43,328 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 17:58:43,328 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 17:58:43,328 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 17:58:43,328 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 17:58:43,329 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 17:58:43,329 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 17:58:43,329 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 17:58:43,329 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 17:58:43,329 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 17:58:43,329 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 17:58:43,330 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 17:58:43,330 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 17:58:43,533 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 17:58:43,533 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 17:58:43,537 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:58:43 BoogieIcfgContainer [2020-07-20 17:58:43,538 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 17:58:43,539 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 17:58:43,539 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 17:58:43,543 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 17:58:43,543 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:58:42" (1/3) ... [2020-07-20 17:58:43,544 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52961b4d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:58:43, skipping insertion in model container [2020-07-20 17:58:43,544 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:58:43" (2/3) ... [2020-07-20 17:58:43,544 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52961b4d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:58:43, skipping insertion in model container [2020-07-20 17:58:43,545 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:58:43" (3/3) ... [2020-07-20 17:58:43,546 INFO L109 eAbstractionObserver]: Analyzing ICFG jm2006.i [2020-07-20 17:58:43,558 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 17:58:43,566 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 17:58:43,597 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 17:58:43,661 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 17:58:43,663 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 17:58:43,664 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 17:58:43,664 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 17:58:43,664 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 17:58:43,664 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 17:58:43,664 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 17:58:43,664 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 17:58:43,704 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-20 17:58:43,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-20 17:58:43,710 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:58:43,712 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:58:43,712 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:58:43,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:58:43,717 INFO L82 PathProgramCache]: Analyzing trace with hash -42161200, now seen corresponding path program 1 times [2020-07-20 17:58:43,724 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:58:43,726 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1135946704] [2020-07-20 17:58:43,726 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:43,808 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:58:43,809 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:58:43,812 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 17:58:43,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:58:43,922 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 17:58:43,955 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:58:43,956 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:58:43,957 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1135946704] [2020-07-20 17:58:43,957 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:58:43,958 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-20 17:58:43,959 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1430698925] [2020-07-20 17:58:43,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-20 17:58:43,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:58:43,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-20 17:58:43,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-07-20 17:58:43,979 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 7 states. [2020-07-20 17:58:44,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:58:44,150 INFO L93 Difference]: Finished difference Result 46 states and 57 transitions. [2020-07-20 17:58:44,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 17:58:44,152 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2020-07-20 17:58:44,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:58:44,161 INFO L225 Difference]: With dead ends: 46 [2020-07-20 17:58:44,162 INFO L226 Difference]: Without dead ends: 14 [2020-07-20 17:58:44,166 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-07-20 17:58:44,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-07-20 17:58:44,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-07-20 17:58:44,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-07-20 17:58:44,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-07-20 17:58:44,208 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-07-20 17:58:44,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:58:44,208 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-07-20 17:58:44,208 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-20 17:58:44,209 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-07-20 17:58:44,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 17:58:44,210 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:58:44,210 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:58:44,424 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:44,424 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:58:44,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:58:44,425 INFO L82 PathProgramCache]: Analyzing trace with hash 219103455, now seen corresponding path program 1 times [2020-07-20 17:58:44,426 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:58:44,427 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [779722435] [2020-07-20 17:58:44,427 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:44,459 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:58:44,460 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:58:44,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 17:58:44,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:58:44,559 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:58:44,559 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:58:44,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:58:44,659 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:58:44,659 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [779722435] [2020-07-20 17:58:44,659 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:58:44,660 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2020-07-20 17:58:44,660 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1259671962] [2020-07-20 17:58:44,662 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 17:58:44,662 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:58:44,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 17:58:44,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-07-20 17:58:44,663 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 11 states. [2020-07-20 17:58:44,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:58:44,886 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2020-07-20 17:58:44,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 17:58:44,886 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 13 [2020-07-20 17:58:44,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:58:44,887 INFO L225 Difference]: With dead ends: 25 [2020-07-20 17:58:44,888 INFO L226 Difference]: Without dead ends: 17 [2020-07-20 17:58:44,890 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=73, Invalid=199, Unknown=0, NotChecked=0, Total=272 [2020-07-20 17:58:44,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-07-20 17:58:44,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-07-20 17:58:44,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-07-20 17:58:44,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-07-20 17:58:44,896 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 13 [2020-07-20 17:58:44,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:58:44,896 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-07-20 17:58:44,896 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 17:58:44,896 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-07-20 17:58:44,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-20 17:58:44,897 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:58:44,897 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:58:45,098 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:45,099 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:58:45,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:58:45,099 INFO L82 PathProgramCache]: Analyzing trace with hash -1744767088, now seen corresponding path program 2 times [2020-07-20 17:58:45,100 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:58:45,100 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [353387577] [2020-07-20 17:58:45,100 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:45,133 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:58:45,133 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:58:45,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-20 17:58:45,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:58:45,249 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:58:45,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:58:45,277 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:58:45,422 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:58:45,422 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [353387577] [2020-07-20 17:58:45,423 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:58:45,423 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2020-07-20 17:58:45,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1682169780] [2020-07-20 17:58:45,424 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 17:58:45,424 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:58:45,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 17:58:45,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-20 17:58:45,425 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 17 states. [2020-07-20 17:58:45,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:58:45,967 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2020-07-20 17:58:45,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-20 17:58:45,968 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 16 [2020-07-20 17:58:45,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:58:45,969 INFO L225 Difference]: With dead ends: 31 [2020-07-20 17:58:45,970 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 17:58:45,971 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=188, Invalid=514, Unknown=0, NotChecked=0, Total=702 [2020-07-20 17:58:45,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 17:58:45,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-07-20 17:58:45,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-20 17:58:45,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-07-20 17:58:45,986 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 16 [2020-07-20 17:58:45,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:58:45,987 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-07-20 17:58:45,987 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 17:58:45,987 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-07-20 17:58:45,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 17:58:45,989 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:58:45,989 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:58:46,198 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:46,199 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:58:46,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:58:46,200 INFO L82 PathProgramCache]: Analyzing trace with hash -1040440016, now seen corresponding path program 3 times [2020-07-20 17:58:46,200 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:58:46,200 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1273083836] [2020-07-20 17:58:46,201 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:46,250 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:58:46,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:58:46,252 WARN L261 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-20 17:58:46,255 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:58:46,512 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:58:46,513 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:58:46,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:58:47,041 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:58:47,042 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1273083836] [2020-07-20 17:58:47,042 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:58:47,042 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 29 [2020-07-20 17:58:47,042 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638656481] [2020-07-20 17:58:47,043 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 17:58:47,043 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:58:47,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 17:58:47,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=631, Unknown=0, NotChecked=0, Total=812 [2020-07-20 17:58:47,045 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 29 states. [2020-07-20 17:58:47,552 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 50 [2020-07-20 17:58:47,798 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 49 [2020-07-20 17:58:48,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:58:48,684 INFO L93 Difference]: Finished difference Result 43 states and 54 transitions. [2020-07-20 17:58:48,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-20 17:58:48,685 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 22 [2020-07-20 17:58:48,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:58:48,687 INFO L225 Difference]: With dead ends: 43 [2020-07-20 17:58:48,687 INFO L226 Difference]: Without dead ends: 35 [2020-07-20 17:58:48,689 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=560, Invalid=1420, Unknown=0, NotChecked=0, Total=1980 [2020-07-20 17:58:48,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-20 17:58:48,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-07-20 17:58:48,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 17:58:48,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-07-20 17:58:48,698 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 22 [2020-07-20 17:58:48,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:58:48,699 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-07-20 17:58:48,699 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 17:58:48,699 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-07-20 17:58:48,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-20 17:58:48,700 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:58:48,700 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:58:48,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:48,915 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:58:48,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:58:48,916 INFO L82 PathProgramCache]: Analyzing trace with hash -276146064, now seen corresponding path program 4 times [2020-07-20 17:58:48,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:58:48,917 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2057720938] [2020-07-20 17:58:48,917 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:48,965 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:58:48,965 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:58:48,968 WARN L261 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 99 conjunts are in the unsatisfiable core [2020-07-20 17:58:48,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:58:49,700 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:58:49,700 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:58:49,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:58:51,234 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:58:51,235 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2057720938] [2020-07-20 17:58:51,235 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:58:51,235 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 53 [2020-07-20 17:58:51,236 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1274377736] [2020-07-20 17:58:51,236 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-07-20 17:58:51,236 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:58:51,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-07-20 17:58:51,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=637, Invalid=2119, Unknown=0, NotChecked=0, Total=2756 [2020-07-20 17:58:51,239 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 53 states. [2020-07-20 17:58:52,155 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2020-07-20 17:58:52,561 WARN L193 SmtUtils]: Spent 279.00 ms on a formula simplification. DAG size of input: 120 DAG size of output: 98 [2020-07-20 17:58:52,881 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 117 [2020-07-20 17:58:53,210 WARN L193 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 119 DAG size of output: 97 [2020-07-20 17:58:53,518 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-20 17:58:53,898 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2020-07-20 17:58:54,200 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2020-07-20 17:58:54,484 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-20 17:58:54,765 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-20 17:58:55,041 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2020-07-20 17:58:55,311 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 17:58:58,039 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 117 [2020-07-20 17:58:58,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:58:58,056 INFO L93 Difference]: Finished difference Result 67 states and 90 transitions. [2020-07-20 17:58:58,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-07-20 17:58:58,056 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 34 [2020-07-20 17:58:58,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:58:58,058 INFO L225 Difference]: With dead ends: 67 [2020-07-20 17:58:58,058 INFO L226 Difference]: Without dead ends: 59 [2020-07-20 17:58:58,062 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=1952, Invalid=4528, Unknown=0, NotChecked=0, Total=6480 [2020-07-20 17:58:58,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-20 17:58:58,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-07-20 17:58:58,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-07-20 17:58:58,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-07-20 17:58:58,078 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 34 [2020-07-20 17:58:58,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:58:58,078 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-07-20 17:58:58,078 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-07-20 17:58:58,079 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-07-20 17:58:58,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-07-20 17:58:58,080 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:58:58,080 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:58:58,295 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:58,296 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:58:58,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:58:58,297 INFO L82 PathProgramCache]: Analyzing trace with hash -2111955216, now seen corresponding path program 5 times [2020-07-20 17:58:58,297 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:58:58,298 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1510010074] [2020-07-20 17:58:58,298 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:58,381 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:58:58,382 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:58:58,385 WARN L261 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 195 conjunts are in the unsatisfiable core [2020-07-20 17:58:58,390 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:59:00,738 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:59:00,738 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:59:00,887 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:59:06,557 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:59:06,558 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1510010074] [2020-07-20 17:59:06,558 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:59:06,558 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53] total 101 [2020-07-20 17:59:06,558 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [486358962] [2020-07-20 17:59:06,559 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2020-07-20 17:59:06,559 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:59:06,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2020-07-20 17:59:06,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2413, Invalid=7687, Unknown=0, NotChecked=0, Total=10100 [2020-07-20 17:59:06,563 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 101 states. [2020-07-20 17:59:09,854 WARN L193 SmtUtils]: Spent 424.00 ms on a formula simplification that was a NOOP. DAG size: 242 [2020-07-20 17:59:10,856 WARN L193 SmtUtils]: Spent 756.00 ms on a formula simplification. DAG size of input: 240 DAG size of output: 194 [2020-07-20 17:59:12,097 WARN L193 SmtUtils]: Spent 414.00 ms on a formula simplification that was a NOOP. DAG size: 237 [2020-07-20 17:59:13,006 WARN L193 SmtUtils]: Spent 732.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 193 [2020-07-20 17:59:14,234 WARN L193 SmtUtils]: Spent 407.00 ms on a formula simplification that was a NOOP. DAG size: 232 [2020-07-20 17:59:15,617 WARN L193 SmtUtils]: Spent 406.00 ms on a formula simplification that was a NOOP. DAG size: 227 [2020-07-20 17:59:16,786 WARN L193 SmtUtils]: Spent 387.00 ms on a formula simplification that was a NOOP. DAG size: 222 [2020-07-20 17:59:17,937 WARN L193 SmtUtils]: Spent 366.00 ms on a formula simplification that was a NOOP. DAG size: 217 [2020-07-20 17:59:19,066 WARN L193 SmtUtils]: Spent 356.00 ms on a formula simplification that was a NOOP. DAG size: 212 [2020-07-20 17:59:20,184 WARN L193 SmtUtils]: Spent 351.00 ms on a formula simplification that was a NOOP. DAG size: 207 [2020-07-20 17:59:21,242 WARN L193 SmtUtils]: Spent 342.00 ms on a formula simplification that was a NOOP. DAG size: 202 [2020-07-20 17:59:22,293 WARN L193 SmtUtils]: Spent 333.00 ms on a formula simplification that was a NOOP. DAG size: 197 [2020-07-20 17:59:23,339 WARN L193 SmtUtils]: Spent 321.00 ms on a formula simplification that was a NOOP. DAG size: 192 [2020-07-20 17:59:24,351 WARN L193 SmtUtils]: Spent 322.00 ms on a formula simplification that was a NOOP. DAG size: 187 [2020-07-20 17:59:25,361 WARN L193 SmtUtils]: Spent 302.00 ms on a formula simplification that was a NOOP. DAG size: 182 [2020-07-20 17:59:26,322 WARN L193 SmtUtils]: Spent 291.00 ms on a formula simplification that was a NOOP. DAG size: 177 [2020-07-20 17:59:27,238 WARN L193 SmtUtils]: Spent 281.00 ms on a formula simplification that was a NOOP. DAG size: 172 [2020-07-20 17:59:28,166 WARN L193 SmtUtils]: Spent 268.00 ms on a formula simplification that was a NOOP. DAG size: 167 [2020-07-20 17:59:29,062 WARN L193 SmtUtils]: Spent 268.00 ms on a formula simplification that was a NOOP. DAG size: 162 [2020-07-20 17:59:29,958 WARN L193 SmtUtils]: Spent 263.00 ms on a formula simplification that was a NOOP. DAG size: 157 [2020-07-20 17:59:30,832 WARN L193 SmtUtils]: Spent 243.00 ms on a formula simplification that was a NOOP. DAG size: 152 [2020-07-20 17:59:31,670 WARN L193 SmtUtils]: Spent 236.00 ms on a formula simplification that was a NOOP. DAG size: 147 [2020-07-20 17:59:32,512 WARN L193 SmtUtils]: Spent 237.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-07-20 17:59:33,300 WARN L193 SmtUtils]: Spent 216.00 ms on a formula simplification that was a NOOP. DAG size: 137 [2020-07-20 17:59:34,106 WARN L193 SmtUtils]: Spent 222.00 ms on a formula simplification that was a NOOP. DAG size: 132 [2020-07-20 17:59:34,920 WARN L193 SmtUtils]: Spent 216.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2020-07-20 17:59:35,707 WARN L193 SmtUtils]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2020-07-20 17:59:36,460 WARN L193 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 117 [2020-07-20 17:59:37,184 WARN L193 SmtUtils]: Spent 174.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-20 17:59:37,870 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2020-07-20 17:59:38,515 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2020-07-20 17:59:39,139 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-20 17:59:39,747 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-20 17:59:40,335 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2020-07-20 17:59:40,894 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 17:59:41,447 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-20 17:59:41,973 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-20 17:59:47,950 WARN L193 SmtUtils]: Spent 488.00 ms on a formula simplification that was a NOOP. DAG size: 237 [2020-07-20 17:59:47,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:59:47,976 INFO L93 Difference]: Finished difference Result 115 states and 162 transitions. [2020-07-20 17:59:47,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2020-07-20 17:59:47,978 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 58 [2020-07-20 17:59:47,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:59:47,979 INFO L225 Difference]: With dead ends: 115 [2020-07-20 17:59:47,980 INFO L226 Difference]: Without dead ends: 107 [2020-07-20 17:59:47,987 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1598 ImplicationChecksByTransitivity, 46.2s TimeCoverageRelationStatistics Valid=7328, Invalid=15928, Unknown=0, NotChecked=0, Total=23256 [2020-07-20 17:59:47,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-07-20 17:59:48,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2020-07-20 17:59:48,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-07-20 17:59:48,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2020-07-20 17:59:48,035 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 58 [2020-07-20 17:59:48,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:59:48,038 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2020-07-20 17:59:48,038 INFO L480 AbstractCegarLoop]: Interpolant automaton has 101 states. [2020-07-20 17:59:48,038 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2020-07-20 17:59:48,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-07-20 17:59:48,049 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:59:48,049 INFO L422 BasicCegarLoop]: trace histogram [94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:59:48,264 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:48,265 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:59:48,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:59:48,266 INFO L82 PathProgramCache]: Analyzing trace with hash -236770320, now seen corresponding path program 6 times [2020-07-20 17:59:48,267 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:59:48,267 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1770314853] [2020-07-20 17:59:48,267 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:48,441 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:59:48,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:59:48,462 WARN L261 TraceCheckSpWp]: Trace formula consists of 507 conjuncts, 387 conjunts are in the unsatisfiable core [2020-07-20 17:59:48,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:59:58,223 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:59:58,223 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:59:58,616 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 18:00:30,027 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 18:00:30,028 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1770314853] [2020-07-20 18:00:30,028 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:00:30,028 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 101] total 197 [2020-07-20 18:00:30,028 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1277812816] [2020-07-20 18:00:30,030 INFO L459 AbstractCegarLoop]: Interpolant automaton has 197 states [2020-07-20 18:00:30,030 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:00:30,032 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 197 interpolants. [2020-07-20 18:00:30,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9421, Invalid=29191, Unknown=0, NotChecked=0, Total=38612 [2020-07-20 18:00:30,039 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 197 states. [2020-07-20 18:00:50,742 WARN L193 SmtUtils]: Spent 1.80 s on a formula simplification that was a NOOP. DAG size: 482 [2020-07-20 18:00:54,581 WARN L193 SmtUtils]: Spent 2.93 s on a formula simplification. DAG size of input: 480 DAG size of output: 386 [2020-07-20 18:01:05,145 WARN L193 SmtUtils]: Spent 1.82 s on a formula simplification that was a NOOP. DAG size: 477 [2020-07-20 18:01:09,061 WARN L193 SmtUtils]: Spent 3.24 s on a formula simplification. DAG size of input: 479 DAG size of output: 385 [2020-07-20 18:01:19,962 WARN L193 SmtUtils]: Spent 2.03 s on a formula simplification that was a NOOP. DAG size: 472 [2020-07-20 18:01:34,769 WARN L193 SmtUtils]: Spent 2.79 s on a formula simplification that was a NOOP. DAG size: 467 [2020-07-20 18:01:50,108 WARN L193 SmtUtils]: Spent 2.56 s on a formula simplification that was a NOOP. DAG size: 462 [2020-07-20 18:02:07,394 WARN L193 SmtUtils]: Spent 2.83 s on a formula simplification that was a NOOP. DAG size: 457 [2020-07-20 18:02:27,387 WARN L193 SmtUtils]: Spent 3.22 s on a formula simplification that was a NOOP. DAG size: 452 [2020-07-20 18:02:49,875 WARN L193 SmtUtils]: Spent 3.49 s on a formula simplification that was a NOOP. DAG size: 447 [2020-07-20 18:03:15,067 WARN L193 SmtUtils]: Spent 3.85 s on a formula simplification that was a NOOP. DAG size: 442 [2020-07-20 18:03:42,495 WARN L193 SmtUtils]: Spent 4.19 s on a formula simplification that was a NOOP. DAG size: 437 [2020-07-20 18:04:09,439 WARN L193 SmtUtils]: Spent 3.64 s on a formula simplification that was a NOOP. DAG size: 432 [2020-07-20 18:04:37,834 WARN L193 SmtUtils]: Spent 4.42 s on a formula simplification that was a NOOP. DAG size: 427 [2020-07-20 18:05:10,042 WARN L193 SmtUtils]: Spent 4.57 s on a formula simplification that was a NOOP. DAG size: 422 [2020-07-20 18:05:43,349 WARN L193 SmtUtils]: Spent 4.68 s on a formula simplification that was a NOOP. DAG size: 417 [2020-07-20 18:06:14,498 WARN L193 SmtUtils]: Spent 4.46 s on a formula simplification that was a NOOP. DAG size: 412 [2020-07-20 18:06:48,737 WARN L193 SmtUtils]: Spent 4.89 s on a formula simplification that was a NOOP. DAG size: 407 [2020-07-20 18:07:24,183 WARN L193 SmtUtils]: Spent 5.01 s on a formula simplification that was a NOOP. DAG size: 402 [2020-07-20 18:07:58,393 WARN L193 SmtUtils]: Spent 5.02 s on a formula simplification that was a NOOP. DAG size: 397 [2020-07-20 18:08:34,185 WARN L193 SmtUtils]: Spent 4.97 s on a formula simplification that was a NOOP. DAG size: 392 [2020-07-20 18:09:09,569 WARN L193 SmtUtils]: Spent 4.97 s on a formula simplification that was a NOOP. DAG size: 387 [2020-07-20 18:09:43,843 WARN L193 SmtUtils]: Spent 4.96 s on a formula simplification that was a NOOP. DAG size: 382 [2020-07-20 18:10:13,558 WARN L193 SmtUtils]: Spent 4.05 s on a formula simplification that was a NOOP. DAG size: 377 [2020-07-20 18:10:42,422 WARN L193 SmtUtils]: Spent 4.16 s on a formula simplification that was a NOOP. DAG size: 372 [2020-07-20 18:11:09,923 WARN L193 SmtUtils]: Spent 3.79 s on a formula simplification that was a NOOP. DAG size: 367 [2020-07-20 18:11:37,610 WARN L193 SmtUtils]: Spent 4.28 s on a formula simplification that was a NOOP. DAG size: 362 [2020-07-20 18:12:07,781 WARN L193 SmtUtils]: Spent 4.31 s on a formula simplification that was a NOOP. DAG size: 357 [2020-07-20 18:12:39,397 WARN L193 SmtUtils]: Spent 4.40 s on a formula simplification that was a NOOP. DAG size: 352 [2020-07-20 18:13:08,489 WARN L193 SmtUtils]: Spent 3.95 s on a formula simplification that was a NOOP. DAG size: 347