/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_8-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 19:43:10,157 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-21 19:43:10,186 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 19:43:10,189 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 19:43:10,192 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 19:43:10,206 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 19:43:10,211 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 19:43:10,214 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 19:43:10,217 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 19:43:10,219 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 19:43:10,219 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 19:43:10,223 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 19:43:10,227 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 19:43:10,229 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 19:43:10,232 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 19:43:10,233 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 19:43:10,235 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 19:43:10,242 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 19:43:10,248 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 19:43:10,253 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 19:43:10,254 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 19:43:10,255 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 19:43:10,259 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 19:43:10,277 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 19:43:10,278 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 19:43:10,279 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 19:43:10,280 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 19:43:10,297 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 19:43:10,297 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 19:43:10,299 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 19:43:10,299 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 19:43:10,299 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 19:43:10,300 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 19:43:10,300 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 19:43:10,300 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 19:43:10,300 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 19:43:10,300 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 19:43:10,301 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 19:43:10,301 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 19:43:10,301 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 19:43:10,301 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 19:43:10,302 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 19:43:10,302 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 19:43:10,302 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 19:43:10,302 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 19:43:10,303 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 19:43:10,303 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 19:43:10,303 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 19:43:10,303 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:43:10,303 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 19:43:10,304 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 19:43:10,304 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 19:43:10,304 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 19:43:10,304 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:10,304 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 19:43:10,305 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 19:43:10,305 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 19:43:10,752 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 19:43:10,773 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 19:43:10,780 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 19:43:10,782 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 19:43:10,783 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 19:43:10,784 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_8-2.c [2020-07-21 19:43:10,907 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4276cacfa/f04cb1d4bbd44bb2844b38334292c3da/FLAG0d6dd0409 [2020-07-21 19:43:11,577 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 19:43:11,578 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_8-2.c [2020-07-21 19:43:11,587 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4276cacfa/f04cb1d4bbd44bb2844b38334292c3da/FLAG0d6dd0409 [2020-07-21 19:43:11,932 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4276cacfa/f04cb1d4bbd44bb2844b38334292c3da [2020-07-21 19:43:11,944 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 19:43:11,948 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 19:43:11,949 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 19:43:11,950 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 19:43:11,955 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 19:43:11,957 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:43:11" (1/1) ... [2020-07-21 19:43:11,961 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@63ebbc37 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:11, skipping insertion in model container [2020-07-21 19:43:11,962 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:43:11" (1/1) ... [2020-07-21 19:43:11,971 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 19:43:11,992 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 19:43:12,219 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:43:12,226 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 19:43:12,250 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:43:12,269 INFO L208 MainTranslator]: Completed translation [2020-07-21 19:43:12,270 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:12 WrapperNode [2020-07-21 19:43:12,270 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 19:43:12,271 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 19:43:12,272 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 19:43:12,272 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 19:43:12,289 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:12" (1/1) ... [2020-07-21 19:43:12,290 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:12" (1/1) ... [2020-07-21 19:43:12,296 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:12" (1/1) ... [2020-07-21 19:43:12,297 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:12" (1/1) ... [2020-07-21 19:43:12,302 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:12" (1/1) ... [2020-07-21 19:43:12,305 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:12" (1/1) ... [2020-07-21 19:43:12,307 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:12" (1/1) ... [2020-07-21 19:43:12,309 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 19:43:12,310 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 19:43:12,310 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 19:43:12,310 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 19:43:12,312 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:12" (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 19:43:12,484 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 19:43:12,484 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 19:43:12,485 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-21 19:43:12,485 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-21 19:43:12,485 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 19:43:12,485 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 19:43:12,486 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 19:43:12,486 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-21 19:43:12,486 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-21 19:43:12,486 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 19:43:12,486 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 19:43:12,487 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 19:43:12,707 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 19:43:12,707 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 19:43:12,713 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:43:12 BoogieIcfgContainer [2020-07-21 19:43:12,713 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 19:43:12,715 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 19:43:12,715 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 19:43:12,719 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 19:43:12,720 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 07:43:11" (1/3) ... [2020-07-21 19:43:12,726 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a68c138 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:43:12, skipping insertion in model container [2020-07-21 19:43:12,726 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:43:12" (2/3) ... [2020-07-21 19:43:12,727 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4a68c138 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:43:12, skipping insertion in model container [2020-07-21 19:43:12,727 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:43:12" (3/3) ... [2020-07-21 19:43:12,739 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_8-2.c [2020-07-21 19:43:12,765 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 19:43:12,799 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 19:43:12,819 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 19:43:12,862 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 19:43:12,862 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 19:43:12,862 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 19:43:12,863 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 19:43:12,863 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 19:43:12,864 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 19:43:12,865 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 19:43:12,865 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 19:43:12,887 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 19:43:12,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 19:43:12,894 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:12,896 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:12,896 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:12,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:12,904 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-21 19:43:12,914 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:12,915 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [129189991] [2020-07-21 19:43:12,915 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 19:43:12,995 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:43:12,995 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:12,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 19:43:13,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:13,114 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 19:43:13,115 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:43:13,116 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [129189991] [2020-07-21 19:43:13,117 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:43:13,118 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:43:13,119 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395581456] [2020-07-21 19:43:13,125 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:43:13,126 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:13,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:43:13,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:43:13,145 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-21 19:43:13,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:13,299 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-21 19:43:13,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:43:13,303 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 19:43:13,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:13,317 INFO L225 Difference]: With dead ends: 44 [2020-07-21 19:43:13,317 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 19:43:13,322 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 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 19:43:13,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 19:43:13,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 19:43:13,379 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 19:43:13,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 19:43:13,383 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-21 19:43:13,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:13,384 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 19:43:13,384 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:43:13,385 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 19:43:13,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 19:43:13,388 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:13,388 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:13,604 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:13,605 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:13,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:13,606 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-21 19:43:13,607 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:13,608 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [426124420] [2020-07-21 19:43:13,608 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 19:43:13,639 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:43:13,639 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:13,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 19:43:13,643 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:13,682 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 19:43:13,683 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:43:13,684 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [426124420] [2020-07-21 19:43:13,684 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:43:13,684 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:43:13,685 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1072386937] [2020-07-21 19:43:13,687 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:43:13,688 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:13,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:43:13,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:43:13,689 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-21 19:43:13,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:13,774 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-21 19:43:13,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:43:13,775 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 19:43:13,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:13,778 INFO L225 Difference]: With dead ends: 36 [2020-07-21 19:43:13,778 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 19:43:13,780 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 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 19:43:13,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 19:43:13,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 19:43:13,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 19:43:13,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 19:43:13,792 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-21 19:43:13,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:13,793 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 19:43:13,793 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:43:13,793 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 19:43:13,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 19:43:13,795 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:13,796 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, 1] [2020-07-21 19:43:14,011 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:14,012 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:14,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:14,013 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-21 19:43:14,014 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:14,015 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1027998557] [2020-07-21 19:43:14,015 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 19:43:14,067 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:43:14,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:14,070 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 19:43:14,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:14,141 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 19:43:14,141 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:14,375 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:14,384 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:14,443 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 19:43:14,444 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1027998557] [2020-07-21 19:43:14,445 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:14,445 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 19:43:14,445 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [459101892] [2020-07-21 19:43:14,446 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 19:43:14,447 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:14,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 19:43:14,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 19:43:14,448 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-21 19:43:14,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:14,635 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 19:43:14,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 19:43:14,636 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-21 19:43:14,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:14,639 INFO L225 Difference]: With dead ends: 41 [2020-07-21 19:43:14,640 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 19:43:14,641 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 19:43:14,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 19:43:14,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-21 19:43:14,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 19:43:14,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 19:43:14,653 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-21 19:43:14,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:14,654 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 19:43:14,654 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 19:43:14,655 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 19:43:14,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 19:43:14,657 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:14,657 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:14,872 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:14,873 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:14,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:14,874 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-21 19:43:14,874 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:14,875 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [84042729] [2020-07-21 19:43:14,875 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 19:43:14,917 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:43:14,918 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:14,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 19:43:14,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:14,982 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 19:43:14,982 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:15,159 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:15,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:15,204 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 19:43:15,205 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [84042729] [2020-07-21 19:43:15,206 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:15,206 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 19:43:15,206 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [176133931] [2020-07-21 19:43:15,207 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 19:43:15,208 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:15,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 19:43:15,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 19:43:15,209 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-21 19:43:15,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:15,379 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-21 19:43:15,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 19:43:15,380 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 19:43:15,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:15,383 INFO L225 Difference]: With dead ends: 46 [2020-07-21 19:43:15,383 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 19:43:15,384 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 19:43:15,385 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 19:43:15,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-21 19:43:15,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 19:43:15,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 19:43:15,395 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-21 19:43:15,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:15,396 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 19:43:15,396 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 19:43:15,396 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 19:43:15,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 19:43:15,398 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:15,399 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:15,612 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:15,613 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:15,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:15,615 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-21 19:43:15,615 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:15,616 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1432448997] [2020-07-21 19:43:15,616 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 19:43:15,658 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:15,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:15,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:43:15,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:15,748 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 19:43:15,751 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:16,027 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:16,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:16,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:16,195 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 19:43:16,195 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1432448997] [2020-07-21 19:43:16,196 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:16,196 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 19:43:16,197 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1218673330] [2020-07-21 19:43:16,197 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 19:43:16,198 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:16,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 19:43:16,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 19:43:16,199 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-21 19:43:16,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:16,398 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-21 19:43:16,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:43:16,399 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-21 19:43:16,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:16,401 INFO L225 Difference]: With dead ends: 51 [2020-07-21 19:43:16,401 INFO L226 Difference]: Without dead ends: 47 [2020-07-21 19:43:16,404 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:43:16,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-21 19:43:16,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-21 19:43:16,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 19:43:16,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 19:43:16,418 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-21 19:43:16,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:16,418 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 19:43:16,419 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 19:43:16,419 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 19:43:16,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 19:43:16,421 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:16,421 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:16,637 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:16,638 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:16,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:16,639 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-21 19:43:16,639 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:16,640 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [332708506] [2020-07-21 19:43:16,641 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 19:43:16,687 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:16,687 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:16,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:43:16,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:16,741 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 19:43:16,742 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:17,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:17,053 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:17,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:17,101 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 19:43:17,102 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [332708506] [2020-07-21 19:43:17,102 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:17,102 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 19:43:17,102 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732200693] [2020-07-21 19:43:17,103 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 19:43:17,105 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:17,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 19:43:17,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 19:43:17,106 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-21 19:43:17,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:17,300 INFO L93 Difference]: Finished difference Result 56 states and 84 transitions. [2020-07-21 19:43:17,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:43:17,303 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-21 19:43:17,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:17,310 INFO L225 Difference]: With dead ends: 56 [2020-07-21 19:43:17,311 INFO L226 Difference]: Without dead ends: 52 [2020-07-21 19:43:17,312 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:43:17,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-21 19:43:17,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2020-07-21 19:43:17,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 19:43:17,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 19:43:17,338 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 40 [2020-07-21 19:43:17,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:17,338 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 19:43:17,339 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 19:43:17,339 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 19:43:17,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-21 19:43:17,349 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:17,349 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 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 19:43:17,565 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:17,566 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:17,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:17,567 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2020-07-21 19:43:17,567 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:17,568 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [904564769] [2020-07-21 19:43:17,568 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 19:43:17,612 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:17,612 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:17,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:43:17,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:17,710 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 19:43:17,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:18,121 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:18,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:18,218 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:18,271 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:18,327 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 19:43:18,328 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [904564769] [2020-07-21 19:43:18,328 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:18,328 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 19:43:18,328 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593737964] [2020-07-21 19:43:18,329 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 19:43:18,329 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:18,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 19:43:18,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:43:18,330 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 14 states. [2020-07-21 19:43:18,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:18,572 INFO L93 Difference]: Finished difference Result 61 states and 96 transitions. [2020-07-21 19:43:18,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:43:18,574 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 52 [2020-07-21 19:43:18,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:18,581 INFO L225 Difference]: With dead ends: 61 [2020-07-21 19:43:18,581 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 19:43:18,585 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 86 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 19:43:18,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 19:43:18,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2020-07-21 19:43:18,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 19:43:18,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-21 19:43:18,606 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 52 [2020-07-21 19:43:18,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:18,606 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-21 19:43:18,607 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 19:43:18,607 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-21 19:43:18,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-21 19:43:18,610 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:18,610 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 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 19:43:18,824 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:18,825 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:18,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:18,826 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-21 19:43:18,826 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:18,826 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2101525744] [2020-07-21 19:43:18,826 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 19:43:18,872 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:18,872 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:18,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:43:18,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:18,981 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-07-21 19:43:18,982 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:19,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:19,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:19,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:19,451 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:19,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:19,558 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 19:43:19,559 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2101525744] [2020-07-21 19:43:19,560 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:19,561 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 19:43:19,562 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672498097] [2020-07-21 19:43:19,564 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 19:43:19,564 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:19,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 19:43:19,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:43:19,567 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 14 states. [2020-07-21 19:43:19,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:19,817 INFO L93 Difference]: Finished difference Result 66 states and 110 transitions. [2020-07-21 19:43:19,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:43:19,818 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 54 [2020-07-21 19:43:19,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:19,820 INFO L225 Difference]: With dead ends: 66 [2020-07-21 19:43:19,821 INFO L226 Difference]: Without dead ends: 62 [2020-07-21 19:43:19,822 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 90 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 19:43:19,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-21 19:43:19,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 45. [2020-07-21 19:43:19,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 19:43:19,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-21 19:43:19,835 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 54 [2020-07-21 19:43:19,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:19,836 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-21 19:43:19,836 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 19:43:19,836 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-21 19:43:19,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-21 19:43:19,838 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:19,839 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:20,054 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:20,056 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:20,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:20,057 INFO L82 PathProgramCache]: Analyzing trace with hash -975547772, now seen corresponding path program 3 times [2020-07-21 19:43:20,057 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:20,058 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1622277595] [2020-07-21 19:43:20,059 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 19:43:20,121 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:20,122 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:20,123 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:43:20,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:20,228 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 60 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-21 19:43:20,229 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:20,900 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:20,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:21,066 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:21,169 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:21,171 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:21,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:21,224 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:21,275 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 68 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2020-07-21 19:43:21,276 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1622277595] [2020-07-21 19:43:21,276 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:21,277 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 19:43:21,277 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [233996389] [2020-07-21 19:43:21,278 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 19:43:21,279 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:21,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 19:43:21,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 19:43:21,280 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 16 states. [2020-07-21 19:43:21,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:21,554 INFO L93 Difference]: Finished difference Result 71 states and 124 transitions. [2020-07-21 19:43:21,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:43:21,555 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 78 [2020-07-21 19:43:21,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:21,558 INFO L225 Difference]: With dead ends: 71 [2020-07-21 19:43:21,558 INFO L226 Difference]: Without dead ends: 67 [2020-07-21 19:43:21,559 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 134 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:43:21,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-21 19:43:21,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 50. [2020-07-21 19:43:21,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-21 19:43:21,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-21 19:43:21,575 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 78 [2020-07-21 19:43:21,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:21,576 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-21 19:43:21,576 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 19:43:21,576 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-21 19:43:21,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-21 19:43:21,581 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:21,582 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:21,795 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:21,796 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:21,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:21,797 INFO L82 PathProgramCache]: Analyzing trace with hash 1891337214, now seen corresponding path program 2 times [2020-07-21 19:43:21,797 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:21,797 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1767309192] [2020-07-21 19:43:21,798 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 19:43:21,887 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:21,888 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:21,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:43:21,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:21,972 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 115 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-07-21 19:43:21,973 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:22,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:22,709 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:22,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:22,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:22,949 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 125 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-07-21 19:43:22,950 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1767309192] [2020-07-21 19:43:22,951 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:22,951 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 19:43:22,951 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640850485] [2020-07-21 19:43:22,954 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 19:43:22,955 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:22,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 19:43:22,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 19:43:22,956 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 16 states. [2020-07-21 19:43:23,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:23,252 INFO L93 Difference]: Finished difference Result 76 states and 140 transitions. [2020-07-21 19:43:23,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:43:23,253 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 108 [2020-07-21 19:43:23,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:23,259 INFO L225 Difference]: With dead ends: 76 [2020-07-21 19:43:23,260 INFO L226 Difference]: Without dead ends: 72 [2020-07-21 19:43:23,261 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 192 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:43:23,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-21 19:43:23,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 50. [2020-07-21 19:43:23,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-21 19:43:23,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-21 19:43:23,304 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 108 [2020-07-21 19:43:23,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:23,305 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-21 19:43:23,305 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 19:43:23,305 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-21 19:43:23,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2020-07-21 19:43:23,314 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:23,314 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 13, 13, 12, 9, 9, 9, 9, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:23,516 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:23,517 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:23,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:23,518 INFO L82 PathProgramCache]: Analyzing trace with hash -815433282, now seen corresponding path program 4 times [2020-07-21 19:43:23,519 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:23,519 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1834989147] [2020-07-21 19:43:23,520 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 19:43:23,626 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:23,626 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:23,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 466 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:43:23,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:23,741 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 332 refuted. 0 times theorem prover too weak. 800 trivial. 0 not checked. [2020-07-21 19:43:23,741 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:24,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:25,183 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:25,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:25,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:25,332 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:25,423 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:25,474 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:25,475 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:25,557 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 346 refuted. 0 times theorem prover too weak. 786 trivial. 0 not checked. [2020-07-21 19:43:25,558 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1834989147] [2020-07-21 19:43:25,558 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:25,558 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 19:43:25,558 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084423763] [2020-07-21 19:43:25,560 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 19:43:25,560 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:25,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 19:43:25,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 19:43:25,561 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 18 states. [2020-07-21 19:43:25,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:25,871 INFO L93 Difference]: Finished difference Result 81 states and 156 transitions. [2020-07-21 19:43:25,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:43:25,872 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 208 [2020-07-21 19:43:25,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:25,881 INFO L225 Difference]: With dead ends: 81 [2020-07-21 19:43:25,882 INFO L226 Difference]: Without dead ends: 77 [2020-07-21 19:43:25,884 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 389 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 19:43:25,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-07-21 19:43:25,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 55. [2020-07-21 19:43:25,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-21 19:43:25,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-21 19:43:25,924 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 208 [2020-07-21 19:43:25,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:25,925 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-21 19:43:25,925 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 19:43:25,925 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-21 19:43:25,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 19:43:25,934 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:25,934 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:26,135 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:26,136 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:26,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:26,137 INFO L82 PathProgramCache]: Analyzing trace with hash 1180347891, now seen corresponding path program 2 times [2020-07-21 19:43:26,137 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:26,138 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [48561578] [2020-07-21 19:43:26,138 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 19:43:26,228 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:26,229 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:26,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:43:26,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:26,315 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 24 proven. 149 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2020-07-21 19:43:26,315 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:27,217 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:27,454 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:27,455 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:27,605 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:27,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:27,702 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:27,764 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:27,823 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 24 proven. 165 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2020-07-21 19:43:27,824 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [48561578] [2020-07-21 19:43:27,824 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:27,824 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 19:43:27,825 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795578399] [2020-07-21 19:43:27,826 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 19:43:27,826 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:27,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 19:43:27,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 19:43:27,827 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 18 states. [2020-07-21 19:43:28,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:28,195 INFO L93 Difference]: Finished difference Result 86 states and 174 transitions. [2020-07-21 19:43:28,196 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:43:28,196 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 121 [2020-07-21 19:43:28,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:28,199 INFO L225 Difference]: With dead ends: 86 [2020-07-21 19:43:28,199 INFO L226 Difference]: Without dead ends: 82 [2020-07-21 19:43:28,200 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 214 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 19:43:28,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-07-21 19:43:28,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 55. [2020-07-21 19:43:28,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-21 19:43:28,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-21 19:43:28,214 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 121 [2020-07-21 19:43:28,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:28,214 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-21 19:43:28,215 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 19:43:28,215 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-21 19:43:28,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2020-07-21 19:43:28,218 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:28,218 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 11, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:28,431 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:28,432 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:28,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:28,433 INFO L82 PathProgramCache]: Analyzing trace with hash 2099307065, now seen corresponding path program 5 times [2020-07-21 19:43:28,434 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:28,434 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [103328553] [2020-07-21 19:43:28,435 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 19:43:28,558 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:28,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:28,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 437 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:43:28,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:28,703 INFO L134 CoverageAnalysis]: Checked inductivity of 1023 backedges. 62 proven. 331 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2020-07-21 19:43:28,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:30,094 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:30,095 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:30,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:30,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:30,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:30,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:30,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:31,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:31,066 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:31,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:31,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:31,183 INFO L134 CoverageAnalysis]: Checked inductivity of 1023 backedges. 62 proven. 352 refuted. 0 times theorem prover too weak. 609 trivial. 0 not checked. [2020-07-21 19:43:31,184 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [103328553] [2020-07-21 19:43:31,184 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:31,184 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 19:43:31,184 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437980731] [2020-07-21 19:43:31,185 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 19:43:31,185 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:31,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 19:43:31,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 19:43:31,186 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 20 states. [2020-07-21 19:43:31,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:31,666 INFO L93 Difference]: Finished difference Result 91 states and 192 transitions. [2020-07-21 19:43:31,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:43:31,667 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 195 [2020-07-21 19:43:31,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:31,671 INFO L225 Difference]: With dead ends: 91 [2020-07-21 19:43:31,671 INFO L226 Difference]: Without dead ends: 87 [2020-07-21 19:43:31,673 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 359 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 19:43:31,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-07-21 19:43:31,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 60. [2020-07-21 19:43:31,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 19:43:31,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 100 transitions. [2020-07-21 19:43:31,687 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 100 transitions. Word has length 195 [2020-07-21 19:43:31,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:31,688 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 100 transitions. [2020-07-21 19:43:31,688 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 19:43:31,688 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 100 transitions. [2020-07-21 19:43:31,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-07-21 19:43:31,691 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:31,691 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 12, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:31,905 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:31,906 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:31,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:31,907 INFO L82 PathProgramCache]: Analyzing trace with hash 266210309, now seen corresponding path program 3 times [2020-07-21 19:43:31,908 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:31,909 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [381814820] [2020-07-21 19:43:31,909 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 19:43:32,063 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:32,064 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:32,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 449 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:43:32,071 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:32,230 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 69 proven. 347 refuted. 0 times theorem prover too weak. 658 trivial. 0 not checked. [2020-07-21 19:43:32,231 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:33,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:34,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:34,275 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:34,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:34,751 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:34,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:34,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:34,893 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:34,964 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 69 proven. 371 refuted. 0 times theorem prover too weak. 634 trivial. 0 not checked. [2020-07-21 19:43:34,964 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [381814820] [2020-07-21 19:43:34,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:34,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-21 19:43:34,965 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [805001453] [2020-07-21 19:43:34,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 19:43:34,966 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:34,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 19:43:34,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:43:34,967 INFO L87 Difference]: Start difference. First operand 60 states and 100 transitions. Second operand 19 states. [2020-07-21 19:43:35,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:35,299 INFO L93 Difference]: Finished difference Result 96 states and 212 transitions. [2020-07-21 19:43:35,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:43:35,299 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 201 [2020-07-21 19:43:35,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:35,304 INFO L225 Difference]: With dead ends: 96 [2020-07-21 19:43:35,305 INFO L226 Difference]: Without dead ends: 92 [2020-07-21 19:43:35,306 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 370 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-21 19:43:35,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-07-21 19:43:35,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 60. [2020-07-21 19:43:35,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 19:43:35,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 100 transitions. [2020-07-21 19:43:35,321 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 100 transitions. Word has length 201 [2020-07-21 19:43:35,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:35,322 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 100 transitions. [2020-07-21 19:43:35,322 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 19:43:35,322 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 100 transitions. [2020-07-21 19:43:35,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 352 [2020-07-21 19:43:35,331 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:35,331 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 22, 21, 21, 16, 16, 16, 16, 16, 16, 16, 16, 10, 10, 10, 10, 10, 10, 10, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:35,544 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:35,545 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:35,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:35,546 INFO L82 PathProgramCache]: Analyzing trace with hash -865443995, now seen corresponding path program 6 times [2020-07-21 19:43:35,547 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:35,547 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1843047912] [2020-07-21 19:43:35,547 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 19:43:35,753 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:35,753 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:35,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 785 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:43:35,766 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:35,982 INFO L134 CoverageAnalysis]: Checked inductivity of 3649 backedges. 117 proven. 819 refuted. 0 times theorem prover too weak. 2713 trivial. 0 not checked. [2020-07-21 19:43:35,983 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:38,097 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:38,098 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:38,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:38,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:39,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:39,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:39,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:39,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:39,517 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:39,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:39,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:39,767 INFO L134 CoverageAnalysis]: Checked inductivity of 3649 backedges. 117 proven. 849 refuted. 0 times theorem prover too weak. 2683 trivial. 0 not checked. [2020-07-21 19:43:39,768 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1843047912] [2020-07-21 19:43:39,768 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:39,768 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 19:43:39,769 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655092043] [2020-07-21 19:43:39,770 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 19:43:39,770 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:39,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 19:43:39,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:43:39,771 INFO L87 Difference]: Start difference. First operand 60 states and 100 transitions. Second operand 21 states. [2020-07-21 19:43:40,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:40,242 INFO L93 Difference]: Finished difference Result 101 states and 232 transitions. [2020-07-21 19:43:40,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:43:40,243 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 351 [2020-07-21 19:43:40,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:40,248 INFO L225 Difference]: With dead ends: 101 [2020-07-21 19:43:40,248 INFO L226 Difference]: Without dead ends: 97 [2020-07-21 19:43:40,253 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 711 GetRequests, 667 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:43:40,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-07-21 19:43:40,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 65. [2020-07-21 19:43:40,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-21 19:43:40,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 114 transitions. [2020-07-21 19:43:40,271 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 114 transitions. Word has length 351 [2020-07-21 19:43:40,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:40,272 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 114 transitions. [2020-07-21 19:43:40,273 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 19:43:40,273 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 114 transitions. [2020-07-21 19:43:40,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 298 [2020-07-21 19:43:40,278 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:40,279 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 19, 17, 17, 13, 13, 13, 13, 13, 13, 13, 13, 11, 8, 8, 8, 8, 8, 8, 8, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:40,492 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:40,493 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:40,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:40,493 INFO L82 PathProgramCache]: Analyzing trace with hash -1494010988, now seen corresponding path program 3 times [2020-07-21 19:43:40,493 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:40,494 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1987236660] [2020-07-21 19:43:40,494 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 19:43:40,707 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:40,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:40,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 662 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:43:40,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:40,868 INFO L134 CoverageAnalysis]: Checked inductivity of 2517 backedges. 124 proven. 533 refuted. 0 times theorem prover too weak. 1860 trivial. 0 not checked. [2020-07-21 19:43:40,869 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:42,430 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:42,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:42,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:42,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:43,221 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:43,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:43,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:43,522 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:43,574 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:43,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:43,699 INFO L134 CoverageAnalysis]: Checked inductivity of 2517 backedges. 124 proven. 554 refuted. 0 times theorem prover too weak. 1839 trivial. 0 not checked. [2020-07-21 19:43:43,705 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1987236660] [2020-07-21 19:43:43,706 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:43,706 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-21 19:43:43,706 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830491320] [2020-07-21 19:43:43,707 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 19:43:43,707 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:43,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 19:43:43,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:43:43,708 INFO L87 Difference]: Start difference. First operand 65 states and 114 transitions. Second operand 19 states. [2020-07-21 19:43:44,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:44,046 INFO L93 Difference]: Finished difference Result 129 states and 362 transitions. [2020-07-21 19:43:44,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:43:44,047 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 297 [2020-07-21 19:43:44,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:44,051 INFO L225 Difference]: With dead ends: 129 [2020-07-21 19:43:44,051 INFO L226 Difference]: Without dead ends: 125 [2020-07-21 19:43:44,056 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 562 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-21 19:43:44,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2020-07-21 19:43:44,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 67. [2020-07-21 19:43:44,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-07-21 19:43:44,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 120 transitions. [2020-07-21 19:43:44,083 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 120 transitions. Word has length 297 [2020-07-21 19:43:44,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:44,085 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 120 transitions. [2020-07-21 19:43:44,085 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 19:43:44,085 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 120 transitions. [2020-07-21 19:43:44,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 410 [2020-07-21 19:43:44,088 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:44,090 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 25, 25, 25, 23, 17, 17, 17, 17, 17, 17, 17, 12, 12, 12, 12, 12, 12, 12, 11, 11, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:44,321 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:44,321 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:44,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:44,322 INFO L82 PathProgramCache]: Analyzing trace with hash -948476032, now seen corresponding path program 1 times [2020-07-21 19:43:44,322 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:44,323 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1133758234] [2020-07-21 19:43:44,323 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 19:43:44,582 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:44,583 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:44,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 910 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:43:44,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:44,769 INFO L134 CoverageAnalysis]: Checked inductivity of 4805 backedges. 168 proven. 707 refuted. 0 times theorem prover too weak. 3930 trivial. 0 not checked. [2020-07-21 19:43:44,769 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:46,266 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:46,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:46,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:46,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:47,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:47,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:47,200 INFO L134 CoverageAnalysis]: Checked inductivity of 4805 backedges. 168 proven. 723 refuted. 0 times theorem prover too weak. 3914 trivial. 0 not checked. [2020-07-21 19:43:47,201 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1133758234] [2020-07-21 19:43:47,201 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:47,201 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 19:43:47,201 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423459194] [2020-07-21 19:43:47,202 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:43:47,202 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:47,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:43:47,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:43:47,203 INFO L87 Difference]: Start difference. First operand 67 states and 120 transitions. Second operand 17 states. [2020-07-21 19:43:47,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:47,546 INFO L93 Difference]: Finished difference Result 139 states and 413 transitions. [2020-07-21 19:43:47,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:43:47,546 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 409 [2020-07-21 19:43:47,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:47,550 INFO L225 Difference]: With dead ends: 139 [2020-07-21 19:43:47,550 INFO L226 Difference]: Without dead ends: 135 [2020-07-21 19:43:47,554 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 824 GetRequests, 790 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:43:47,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2020-07-21 19:43:47,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 69. [2020-07-21 19:43:47,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-07-21 19:43:47,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 127 transitions. [2020-07-21 19:43:47,569 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 127 transitions. Word has length 409 [2020-07-21 19:43:47,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:47,570 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 127 transitions. [2020-07-21 19:43:47,570 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:43:47,571 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 127 transitions. [2020-07-21 19:43:47,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 532 [2020-07-21 19:43:47,574 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:47,575 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 33, 33, 32, 30, 22, 22, 22, 22, 22, 22, 22, 16, 16, 16, 16, 16, 16, 16, 14, 14, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:47,787 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:47,788 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:47,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:47,789 INFO L82 PathProgramCache]: Analyzing trace with hash -1385064961, now seen corresponding path program 1 times [2020-07-21 19:43:47,789 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:47,790 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1304812669] [2020-07-21 19:43:47,790 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 19:43:48,080 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:48,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:48,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 1181 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:43:48,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:48,446 INFO L134 CoverageAnalysis]: Checked inductivity of 8231 backedges. 323 proven. 1216 refuted. 0 times theorem prover too weak. 6692 trivial. 0 not checked. [2020-07-21 19:43:48,446 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:50,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:51,641 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:52,223 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:52,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:52,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:52,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:52,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:52,820 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:52,867 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:53,047 INFO L134 CoverageAnalysis]: Checked inductivity of 8231 backedges. 327 proven. 1245 refuted. 0 times theorem prover too weak. 6659 trivial. 0 not checked. [2020-07-21 19:43:53,047 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1304812669] [2020-07-21 19:43:53,047 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:53,048 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 19:43:53,048 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [411074869] [2020-07-21 19:43:53,050 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 19:43:53,051 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:53,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 19:43:53,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:43:53,052 INFO L87 Difference]: Start difference. First operand 69 states and 127 transitions. Second operand 21 states. [2020-07-21 19:43:53,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:53,583 INFO L93 Difference]: Finished difference Result 166 states and 566 transitions. [2020-07-21 19:43:53,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:43:53,584 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 531 [2020-07-21 19:43:53,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:53,587 INFO L225 Difference]: With dead ends: 166 [2020-07-21 19:43:53,587 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 19:43:53,590 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1069 GetRequests, 1025 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:43:53,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 19:43:53,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2020-07-21 19:43:53,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-07-21 19:43:53,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 146 transitions. [2020-07-21 19:43:53,601 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 146 transitions. Word has length 531 [2020-07-21 19:43:53,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:53,601 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 146 transitions. [2020-07-21 19:43:53,601 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 19:43:53,601 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 146 transitions. [2020-07-21 19:43:53,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 512 [2020-07-21 19:43:53,606 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:53,607 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 37, 37, 28, 26, 19, 19, 19, 19, 19, 19, 19, 18, 18, 18, 18, 18, 18, 18, 11, 10, 10, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:53,821 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:53,822 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:53,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:53,823 INFO L82 PathProgramCache]: Analyzing trace with hash 2146290224, now seen corresponding path program 2 times [2020-07-21 19:43:53,823 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:53,824 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [430411117] [2020-07-21 19:43:53,824 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 19:43:54,162 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:54,162 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:54,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 1138 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:43:54,174 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:54,419 INFO L134 CoverageAnalysis]: Checked inductivity of 7475 backedges. 270 proven. 993 refuted. 0 times theorem prover too weak. 6212 trivial. 0 not checked. [2020-07-21 19:43:54,420 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:56,277 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:56,278 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:56,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:57,362 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:57,363 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:57,634 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:57,730 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:57,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:57,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:57,997 INFO L134 CoverageAnalysis]: Checked inductivity of 7475 backedges. 270 proven. 1014 refuted. 0 times theorem prover too weak. 6191 trivial. 0 not checked. [2020-07-21 19:43:57,997 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [430411117] [2020-07-21 19:43:57,998 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:57,998 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-21 19:43:57,998 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1942684947] [2020-07-21 19:43:57,999 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 19:43:57,999 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:58,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 19:43:58,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:43:58,000 INFO L87 Difference]: Start difference. First operand 88 states and 146 transitions. Second operand 19 states. [2020-07-21 19:43:58,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:58,347 INFO L93 Difference]: Finished difference Result 167 states and 414 transitions. [2020-07-21 19:43:58,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:43:58,348 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 511 [2020-07-21 19:43:58,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:58,353 INFO L225 Difference]: With dead ends: 167 [2020-07-21 19:43:58,353 INFO L226 Difference]: Without dead ends: 153 [2020-07-21 19:43:58,355 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1028 GetRequests, 989 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-21 19:43:58,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2020-07-21 19:43:58,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 94. [2020-07-21 19:43:58,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-07-21 19:43:58,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 160 transitions. [2020-07-21 19:43:58,369 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 160 transitions. Word has length 511 [2020-07-21 19:43:58,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:58,370 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 160 transitions. [2020-07-21 19:43:58,370 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 19:43:58,370 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 160 transitions. [2020-07-21 19:43:58,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 380 [2020-07-21 19:43:58,373 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:58,373 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 25, 25, 21, 21, 15, 15, 15, 15, 15, 15, 15, 12, 12, 12, 12, 12, 12, 12, 9, 9, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:58,586 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:58,587 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:58,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:58,588 INFO L82 PathProgramCache]: Analyzing trace with hash 66148448, now seen corresponding path program 3 times [2020-07-21 19:43:58,588 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:58,589 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1657209878] [2020-07-21 19:43:58,589 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 19:43:58,874 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:58,874 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:58,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 844 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:43:58,881 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:59,062 INFO L134 CoverageAnalysis]: Checked inductivity of 4044 backedges. 200 proven. 597 refuted. 0 times theorem prover too weak. 3247 trivial. 0 not checked. [2020-07-21 19:43:59,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:00,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:00,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:00,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:01,127 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:01,128 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:01,217 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:01,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:01,269 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:01,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:01,443 INFO L134 CoverageAnalysis]: Checked inductivity of 4044 backedges. 200 proven. 613 refuted. 0 times theorem prover too weak. 3231 trivial. 0 not checked. [2020-07-21 19:44:01,444 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1657209878] [2020-07-21 19:44:01,444 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:01,444 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 19:44:01,444 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [326085428] [2020-07-21 19:44:01,445 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:44:01,445 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:01,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:44:01,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:44:01,445 INFO L87 Difference]: Start difference. First operand 94 states and 160 transitions. Second operand 17 states. [2020-07-21 19:44:01,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:01,792 INFO L93 Difference]: Finished difference Result 173 states and 423 transitions. [2020-07-21 19:44:01,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:44:01,793 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 379 [2020-07-21 19:44:01,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:01,797 INFO L225 Difference]: With dead ends: 173 [2020-07-21 19:44:01,797 INFO L226 Difference]: Without dead ends: 158 [2020-07-21 19:44:01,799 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 763 GetRequests, 729 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:44:01,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2020-07-21 19:44:01,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 101. [2020-07-21 19:44:01,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-07-21 19:44:01,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 180 transitions. [2020-07-21 19:44:01,815 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 180 transitions. Word has length 379 [2020-07-21 19:44:01,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:01,816 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 180 transitions. [2020-07-21 19:44:01,816 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:44:01,816 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 180 transitions. [2020-07-21 19:44:01,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 443 [2020-07-21 19:44:01,820 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:01,820 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 32, 23, 22, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 11, 9, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:02,033 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:02,034 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:02,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:02,035 INFO L82 PathProgramCache]: Analyzing trace with hash -1821625141, now seen corresponding path program 4 times [2020-07-21 19:44:02,035 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:02,036 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1596725994] [2020-07-21 19:44:02,036 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 19:44:02,359 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:02,359 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:02,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 985 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:44:02,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:02,593 INFO L134 CoverageAnalysis]: Checked inductivity of 5540 backedges. 243 proven. 831 refuted. 0 times theorem prover too weak. 4466 trivial. 0 not checked. [2020-07-21 19:44:02,593 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:04,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:04,421 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:05,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:05,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:05,558 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:05,653 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:05,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:05,709 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:05,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:05,913 INFO L134 CoverageAnalysis]: Checked inductivity of 5540 backedges. 245 proven. 850 refuted. 0 times theorem prover too weak. 4445 trivial. 0 not checked. [2020-07-21 19:44:05,913 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1596725994] [2020-07-21 19:44:05,913 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:05,914 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-21 19:44:05,914 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014645289] [2020-07-21 19:44:05,914 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 19:44:05,915 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:05,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 19:44:05,915 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:44:05,916 INFO L87 Difference]: Start difference. First operand 101 states and 180 transitions. Second operand 19 states. [2020-07-21 19:44:06,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:06,339 INFO L93 Difference]: Finished difference Result 162 states and 374 transitions. [2020-07-21 19:44:06,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:44:06,340 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 442 [2020-07-21 19:44:06,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:06,344 INFO L225 Difference]: With dead ends: 162 [2020-07-21 19:44:06,345 INFO L226 Difference]: Without dead ends: 147 [2020-07-21 19:44:06,347 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 890 GetRequests, 851 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-21 19:44:06,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2020-07-21 19:44:06,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 99. [2020-07-21 19:44:06,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-07-21 19:44:06,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 173 transitions. [2020-07-21 19:44:06,362 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 173 transitions. Word has length 442 [2020-07-21 19:44:06,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:06,362 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 173 transitions. [2020-07-21 19:44:06,362 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 19:44:06,362 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 173 transitions. [2020-07-21 19:44:06,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 354 [2020-07-21 19:44:06,366 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:06,366 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 22, 18, 13, 13, 13, 13, 13, 13, 13, 12, 12, 12, 12, 12, 12, 12, 9, 8, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:06,579 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:06,580 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:06,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:06,581 INFO L82 PathProgramCache]: Analyzing trace with hash -591769714, now seen corresponding path program 5 times [2020-07-21 19:44:06,581 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:06,581 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [459633060] [2020-07-21 19:44:06,582 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 19:44:06,889 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:06,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:06,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 786 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:44:06,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:07,044 INFO L134 CoverageAnalysis]: Checked inductivity of 3460 backedges. 196 proven. 522 refuted. 0 times theorem prover too weak. 2742 trivial. 0 not checked. [2020-07-21 19:44:07,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:08,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:08,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:08,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:08,756 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:09,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:09,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:09,096 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:09,097 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:09,148 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:09,148 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:09,187 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:09,227 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:09,341 INFO L134 CoverageAnalysis]: Checked inductivity of 3460 backedges. 196 proven. 536 refuted. 0 times theorem prover too weak. 2728 trivial. 0 not checked. [2020-07-21 19:44:09,342 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [459633060] [2020-07-21 19:44:09,342 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:09,342 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 19:44:09,342 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [89230070] [2020-07-21 19:44:09,343 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:44:09,343 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:09,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:44:09,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:44:09,344 INFO L87 Difference]: Start difference. First operand 99 states and 173 transitions. Second operand 17 states. [2020-07-21 19:44:09,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:09,660 INFO L93 Difference]: Finished difference Result 174 states and 418 transitions. [2020-07-21 19:44:09,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:44:09,665 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 353 [2020-07-21 19:44:09,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:09,668 INFO L225 Difference]: With dead ends: 174 [2020-07-21 19:44:09,668 INFO L226 Difference]: Without dead ends: 162 [2020-07-21 19:44:09,670 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 711 GetRequests, 677 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:44:09,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2020-07-21 19:44:09,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 99. [2020-07-21 19:44:09,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-07-21 19:44:09,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 173 transitions. [2020-07-21 19:44:09,689 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 173 transitions. Word has length 353 [2020-07-21 19:44:09,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:09,690 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 173 transitions. [2020-07-21 19:44:09,690 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:44:09,691 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 173 transitions. [2020-07-21 19:44:09,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 396 [2020-07-21 19:44:09,694 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:09,695 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 26, 26, 24, 22, 15, 15, 15, 15, 15, 15, 15, 13, 13, 13, 13, 13, 13, 13, 11, 7, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:09,908 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:09,909 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:09,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:09,910 INFO L82 PathProgramCache]: Analyzing trace with hash 1857774819, now seen corresponding path program 6 times [2020-07-21 19:44:09,910 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:09,911 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [726931898] [2020-07-21 19:44:09,913 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 19:44:10,255 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:10,256 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:10,261 INFO L263 TraceCheckSpWp]: Trace formula consists of 879 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:44:10,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:10,425 INFO L134 CoverageAnalysis]: Checked inductivity of 4399 backedges. 425 proven. 654 refuted. 0 times theorem prover too weak. 3320 trivial. 0 not checked. [2020-07-21 19:44:10,426 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:12,691 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:13,440 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:13,851 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:13,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:14,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:14,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:14,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:14,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:14,424 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:14,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:14,567 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:14,797 INFO L134 CoverageAnalysis]: Checked inductivity of 4399 backedges. 427 proven. 685 refuted. 0 times theorem prover too weak. 3287 trivial. 0 not checked. [2020-07-21 19:44:14,798 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [726931898] [2020-07-21 19:44:14,798 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:14,798 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 19:44:14,798 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [105549625] [2020-07-21 19:44:14,799 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 19:44:14,799 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:14,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 19:44:14,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:44:14,799 INFO L87 Difference]: Start difference. First operand 99 states and 173 transitions. Second operand 21 states. [2020-07-21 19:44:15,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:15,278 INFO L93 Difference]: Finished difference Result 148 states and 295 transitions. [2020-07-21 19:44:15,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:44:15,279 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 395 [2020-07-21 19:44:15,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:15,281 INFO L225 Difference]: With dead ends: 148 [2020-07-21 19:44:15,281 INFO L226 Difference]: Without dead ends: 120 [2020-07-21 19:44:15,283 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 797 GetRequests, 753 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:44:15,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-07-21 19:44:15,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2020-07-21 19:44:15,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2020-07-21 19:44:15,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 220 transitions. [2020-07-21 19:44:15,295 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 220 transitions. Word has length 395 [2020-07-21 19:44:15,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:15,296 INFO L479 AbstractCegarLoop]: Abstraction has 120 states and 220 transitions. [2020-07-21 19:44:15,296 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 19:44:15,296 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 220 transitions. [2020-07-21 19:44:15,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 370 [2020-07-21 19:44:15,300 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:15,301 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 25, 25, 23, 21, 14, 14, 14, 14, 14, 14, 14, 12, 12, 12, 12, 12, 12, 12, 9, 9, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:15,514 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:15,515 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:15,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:15,516 INFO L82 PathProgramCache]: Analyzing trace with hash -1874469079, now seen corresponding path program 7 times [2020-07-21 19:44:15,516 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:15,517 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1563411222] [2020-07-21 19:44:15,517 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 19:44:15,884 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:15,884 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:15,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 821 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:44:15,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:16,087 INFO L134 CoverageAnalysis]: Checked inductivity of 3803 backedges. 289 proven. 714 refuted. 0 times theorem prover too weak. 2800 trivial. 0 not checked. [2020-07-21 19:44:16,087 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:18,448 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:19,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:19,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:19,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:19,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:20,068 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:20,069 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:20,174 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:20,243 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:20,243 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:20,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:20,450 INFO L134 CoverageAnalysis]: Checked inductivity of 3803 backedges. 291 proven. 745 refuted. 0 times theorem prover too weak. 2767 trivial. 0 not checked. [2020-07-21 19:44:20,450 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1563411222] [2020-07-21 19:44:20,450 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:20,451 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 19:44:20,451 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [293250869] [2020-07-21 19:44:20,451 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 19:44:20,451 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:20,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 19:44:20,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:44:20,452 INFO L87 Difference]: Start difference. First operand 120 states and 220 transitions. Second operand 21 states. [2020-07-21 19:44:21,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:21,081 INFO L93 Difference]: Finished difference Result 219 states and 500 transitions. [2020-07-21 19:44:21,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:44:21,082 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 369 [2020-07-21 19:44:21,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:21,084 INFO L225 Difference]: With dead ends: 219 [2020-07-21 19:44:21,085 INFO L226 Difference]: Without dead ends: 123 [2020-07-21 19:44:21,088 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 745 GetRequests, 701 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:44:21,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-21 19:44:21,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 117. [2020-07-21 19:44:21,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-07-21 19:44:21,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 201 transitions. [2020-07-21 19:44:21,099 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 201 transitions. Word has length 369 [2020-07-21 19:44:21,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:21,100 INFO L479 AbstractCegarLoop]: Abstraction has 117 states and 201 transitions. [2020-07-21 19:44:21,100 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 19:44:21,100 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 201 transitions. [2020-07-21 19:44:21,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 437 [2020-07-21 19:44:21,104 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:21,104 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 30, 30, 27, 24, 16, 16, 16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 12, 8, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:21,318 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:21,319 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:21,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:21,320 INFO L82 PathProgramCache]: Analyzing trace with hash -178113026, now seen corresponding path program 8 times [2020-07-21 19:44:21,321 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:21,321 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1775100079] [2020-07-21 19:44:21,321 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 19:44:21,709 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:21,710 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:21,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 970 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:44:21,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:21,951 INFO L134 CoverageAnalysis]: Checked inductivity of 5379 backedges. 261 proven. 667 refuted. 0 times theorem prover too weak. 4451 trivial. 0 not checked. [2020-07-21 19:44:21,951 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:23,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:24,201 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:24,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:24,409 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:24,538 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:24,539 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:24,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:24,598 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:24,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:24,906 INFO L134 CoverageAnalysis]: Checked inductivity of 5379 backedges. 263 proven. 681 refuted. 0 times theorem prover too weak. 4435 trivial. 0 not checked. [2020-07-21 19:44:24,907 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1775100079] [2020-07-21 19:44:24,907 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:24,907 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 19:44:24,907 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [559495945] [2020-07-21 19:44:24,908 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:44:24,908 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:24,908 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:44:24,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:44:24,909 INFO L87 Difference]: Start difference. First operand 117 states and 201 transitions. Second operand 17 states. [2020-07-21 19:44:25,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:25,233 INFO L93 Difference]: Finished difference Result 164 states and 328 transitions. [2020-07-21 19:44:25,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:44:25,235 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 436 [2020-07-21 19:44:25,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:25,238 INFO L225 Difference]: With dead ends: 164 [2020-07-21 19:44:25,239 INFO L226 Difference]: Without dead ends: 155 [2020-07-21 19:44:25,240 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 877 GetRequests, 843 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:44:25,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2020-07-21 19:44:25,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 129. [2020-07-21 19:44:25,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2020-07-21 19:44:25,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 240 transitions. [2020-07-21 19:44:25,256 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 240 transitions. Word has length 436 [2020-07-21 19:44:25,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:25,257 INFO L479 AbstractCegarLoop]: Abstraction has 129 states and 240 transitions. [2020-07-21 19:44:25,257 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:44:25,257 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 240 transitions. [2020-07-21 19:44:25,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 340 [2020-07-21 19:44:25,262 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:25,262 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 22, 22, 20, 18, 13, 13, 13, 13, 13, 13, 13, 11, 11, 11, 11, 11, 11, 11, 9, 7, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:25,477 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:25,478 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:25,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:25,478 INFO L82 PathProgramCache]: Analyzing trace with hash 2066235329, now seen corresponding path program 9 times [2020-07-21 19:44:25,478 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:25,479 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1887069719] [2020-07-21 19:44:25,479 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 19:44:25,868 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:25,869 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:25,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 755 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:44:25,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:26,087 INFO L134 CoverageAnalysis]: Checked inductivity of 3203 backedges. 287 proven. 508 refuted. 0 times theorem prover too weak. 2408 trivial. 0 not checked. [2020-07-21 19:44:26,088 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:27,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:27,836 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:28,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:28,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:28,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:28,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:28,862 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:28,929 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:29,031 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:29,228 INFO L134 CoverageAnalysis]: Checked inductivity of 3203 backedges. 289 proven. 527 refuted. 0 times theorem prover too weak. 2387 trivial. 0 not checked. [2020-07-21 19:44:29,229 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1887069719] [2020-07-21 19:44:29,229 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:29,229 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-21 19:44:29,229 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532805442] [2020-07-21 19:44:29,230 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 19:44:29,230 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:29,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 19:44:29,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:44:29,230 INFO L87 Difference]: Start difference. First operand 129 states and 240 transitions. Second operand 19 states. [2020-07-21 19:44:29,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:29,666 INFO L93 Difference]: Finished difference Result 172 states and 344 transitions. [2020-07-21 19:44:29,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:44:29,667 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 339 [2020-07-21 19:44:29,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:29,670 INFO L225 Difference]: With dead ends: 172 [2020-07-21 19:44:29,671 INFO L226 Difference]: Without dead ends: 163 [2020-07-21 19:44:29,672 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 684 GetRequests, 645 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-21 19:44:29,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2020-07-21 19:44:29,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 125. [2020-07-21 19:44:29,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2020-07-21 19:44:29,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 225 transitions. [2020-07-21 19:44:29,686 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 225 transitions. Word has length 339 [2020-07-21 19:44:29,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:29,687 INFO L479 AbstractCegarLoop]: Abstraction has 125 states and 225 transitions. [2020-07-21 19:44:29,687 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 19:44:29,687 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 225 transitions. [2020-07-21 19:44:29,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 369 [2020-07-21 19:44:29,691 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:29,692 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 26, 26, 23, 20, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 10, 7, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:29,904 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:29,905 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:29,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:29,906 INFO L82 PathProgramCache]: Analyzing trace with hash -1272423961, now seen corresponding path program 10 times [2020-07-21 19:44:29,906 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:29,906 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2139651386] [2020-07-21 19:44:29,907 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 19:44:30,340 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:30,341 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:30,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 819 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:44:30,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:30,506 INFO L134 CoverageAnalysis]: Checked inductivity of 3771 backedges. 264 proven. 485 refuted. 0 times theorem prover too weak. 3022 trivial. 0 not checked. [2020-07-21 19:44:30,506 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:32,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:32,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:32,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:32,469 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:32,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:32,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:32,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:32,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:32,823 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:32,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:32,941 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:33,178 INFO L134 CoverageAnalysis]: Checked inductivity of 3771 backedges. 264 proven. 501 refuted. 0 times theorem prover too weak. 3006 trivial. 0 not checked. [2020-07-21 19:44:33,179 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2139651386] [2020-07-21 19:44:33,179 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:33,179 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 19:44:33,179 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1825047686] [2020-07-21 19:44:33,180 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:44:33,180 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:33,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:44:33,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:44:33,180 INFO L87 Difference]: Start difference. First operand 125 states and 225 transitions. Second operand 17 states. [2020-07-21 19:44:33,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:33,461 INFO L93 Difference]: Finished difference Result 184 states and 375 transitions. [2020-07-21 19:44:33,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:44:33,462 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 368 [2020-07-21 19:44:33,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:33,465 INFO L225 Difference]: With dead ends: 184 [2020-07-21 19:44:33,465 INFO L226 Difference]: Without dead ends: 175 [2020-07-21 19:44:33,467 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 741 GetRequests, 707 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:44:33,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2020-07-21 19:44:33,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 122. [2020-07-21 19:44:33,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2020-07-21 19:44:33,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 215 transitions. [2020-07-21 19:44:33,481 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 215 transitions. Word has length 368 [2020-07-21 19:44:33,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:33,481 INFO L479 AbstractCegarLoop]: Abstraction has 122 states and 215 transitions. [2020-07-21 19:44:33,481 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:44:33,481 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 215 transitions. [2020-07-21 19:44:33,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 491 [2020-07-21 19:44:33,486 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:33,486 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 34, 34, 29, 28, 18, 18, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 12, 10, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:33,700 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:33,701 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:33,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:33,702 INFO L82 PathProgramCache]: Analyzing trace with hash -864101234, now seen corresponding path program 11 times [2020-07-21 19:44:33,702 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:33,702 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [56710068] [2020-07-21 19:44:33,703 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 19:44:34,161 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:34,162 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:34,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 1090 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:44:34,171 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:34,319 INFO L134 CoverageAnalysis]: Checked inductivity of 6848 backedges. 267 proven. 623 refuted. 0 times theorem prover too weak. 5958 trivial. 0 not checked. [2020-07-21 19:44:34,319 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:36,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:36,004 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:36,374 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:36,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:36,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:36,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:36,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:36,696 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:36,935 INFO L134 CoverageAnalysis]: Checked inductivity of 6848 backedges. 267 proven. 633 refuted. 0 times theorem prover too weak. 5948 trivial. 0 not checked. [2020-07-21 19:44:36,936 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [56710068] [2020-07-21 19:44:36,936 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:36,936 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 19:44:36,936 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494692736] [2020-07-21 19:44:36,937 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 19:44:36,937 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:36,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 19:44:36,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:44:36,937 INFO L87 Difference]: Start difference. First operand 122 states and 215 transitions. Second operand 15 states. [2020-07-21 19:44:37,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:37,221 INFO L93 Difference]: Finished difference Result 212 states and 505 transitions. [2020-07-21 19:44:37,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:44:37,222 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 490 [2020-07-21 19:44:37,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:37,227 INFO L225 Difference]: With dead ends: 212 [2020-07-21 19:44:37,227 INFO L226 Difference]: Without dead ends: 203 [2020-07-21 19:44:37,229 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 984 GetRequests, 955 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 19:44:37,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2020-07-21 19:44:37,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 124. [2020-07-21 19:44:37,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-07-21 19:44:37,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 224 transitions. [2020-07-21 19:44:37,248 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 224 transitions. Word has length 490 [2020-07-21 19:44:37,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:37,249 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 224 transitions. [2020-07-21 19:44:37,249 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 19:44:37,249 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 224 transitions. [2020-07-21 19:44:37,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 369 [2020-07-21 19:44:37,253 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:37,253 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 26, 26, 22, 21, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 9, 8, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:37,466 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:37,467 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:37,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:37,468 INFO L82 PathProgramCache]: Analyzing trace with hash -2066771263, now seen corresponding path program 12 times [2020-07-21 19:44:37,468 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:37,468 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [859665043] [2020-07-21 19:44:37,469 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 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 19:44:37,894 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:37,894 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:37,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 819 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:44:37,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:38,071 INFO L134 CoverageAnalysis]: Checked inductivity of 3769 backedges. 394 proven. 372 refuted. 0 times theorem prover too weak. 3003 trivial. 0 not checked. [2020-07-21 19:44:38,071 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:39,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:39,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:39,701 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:39,923 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:40,029 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:40,088 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:40,278 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:40,749 INFO L134 CoverageAnalysis]: Checked inductivity of 3769 backedges. 396 proven. 386 refuted. 0 times theorem prover too weak. 2987 trivial. 0 not checked. [2020-07-21 19:44:40,749 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [859665043] [2020-07-21 19:44:40,749 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:40,750 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 19:44:40,750 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20218923] [2020-07-21 19:44:40,750 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:44:40,750 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:40,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:44:40,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:44:40,751 INFO L87 Difference]: Start difference. First operand 124 states and 224 transitions. Second operand 17 states. [2020-07-21 19:44:41,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:41,147 INFO L93 Difference]: Finished difference Result 176 states and 378 transitions. [2020-07-21 19:44:41,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:44:41,148 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 368 [2020-07-21 19:44:41,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:41,152 INFO L225 Difference]: With dead ends: 176 [2020-07-21 19:44:41,153 INFO L226 Difference]: Without dead ends: 167 [2020-07-21 19:44:41,156 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 741 GetRequests, 707 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:44:41,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2020-07-21 19:44:41,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 144. [2020-07-21 19:44:41,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-21 19:44:41,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 288 transitions. [2020-07-21 19:44:41,183 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 288 transitions. Word has length 368 [2020-07-21 19:44:41,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:41,184 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 288 transitions. [2020-07-21 19:44:41,184 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:44:41,184 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 288 transitions. [2020-07-21 19:44:41,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 433 [2020-07-21 19:44:41,192 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:41,193 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 30, 30, 24, 23, 16, 16, 16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 10, 8, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:41,406 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:41,406 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:41,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:41,406 INFO L82 PathProgramCache]: Analyzing trace with hash 873192572, now seen corresponding path program 13 times [2020-07-21 19:44:41,407 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:41,407 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [425439909] [2020-07-21 19:44:41,407 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 19:44:41,955 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:41,955 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:41,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 962 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:44:41,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:42,193 INFO L134 CoverageAnalysis]: Checked inductivity of 5281 backedges. 466 proven. 584 refuted. 0 times theorem prover too weak. 4231 trivial. 0 not checked. [2020-07-21 19:44:42,194 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:44,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:44,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:44,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:45,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:45,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:45,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:45,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:45,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:46,182 INFO L134 CoverageAnalysis]: Checked inductivity of 5281 backedges. 470 proven. 601 refuted. 0 times theorem prover too weak. 4210 trivial. 0 not checked. [2020-07-21 19:44:46,183 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [425439909] [2020-07-21 19:44:46,183 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:46,183 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-21 19:44:46,183 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1185290731] [2020-07-21 19:44:46,184 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 19:44:46,184 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:46,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 19:44:46,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:44:46,184 INFO L87 Difference]: Start difference. First operand 144 states and 288 transitions. Second operand 19 states. [2020-07-21 19:44:46,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:46,588 INFO L93 Difference]: Finished difference Result 187 states and 408 transitions. [2020-07-21 19:44:46,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:44:46,589 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 432 [2020-07-21 19:44:46,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:46,592 INFO L225 Difference]: With dead ends: 187 [2020-07-21 19:44:46,592 INFO L226 Difference]: Without dead ends: 178 [2020-07-21 19:44:46,594 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 870 GetRequests, 831 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-21 19:44:46,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-07-21 19:44:46,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 148. [2020-07-21 19:44:46,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2020-07-21 19:44:46,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 287 transitions. [2020-07-21 19:44:46,613 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 287 transitions. Word has length 432 [2020-07-21 19:44:46,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:46,613 INFO L479 AbstractCegarLoop]: Abstraction has 148 states and 287 transitions. [2020-07-21 19:44:46,614 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 19:44:46,614 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 287 transitions. [2020-07-21 19:44:46,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 406 [2020-07-21 19:44:46,619 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:46,619 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 28, 28, 23, 21, 15, 15, 15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 9, 8, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:46,833 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:46,834 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:46,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:46,835 INFO L82 PathProgramCache]: Analyzing trace with hash 871808840, now seen corresponding path program 14 times [2020-07-21 19:44:46,835 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:46,835 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1883141361] [2020-07-21 19:44:46,836 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 19:44:47,291 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:47,291 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:47,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 902 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:44:47,297 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:47,440 INFO L134 CoverageAnalysis]: Checked inductivity of 4619 backedges. 293 proven. 542 refuted. 0 times theorem prover too weak. 3784 trivial. 0 not checked. [2020-07-21 19:44:47,441 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:49,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:49,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:49,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:49,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:49,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:49,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:49,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:49,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:50,042 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:50,091 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:50,175 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:50,385 INFO L134 CoverageAnalysis]: Checked inductivity of 4619 backedges. 295 proven. 554 refuted. 0 times theorem prover too weak. 3770 trivial. 0 not checked. [2020-07-21 19:44:50,385 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1883141361] [2020-07-21 19:44:50,385 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:50,385 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 19:44:50,385 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308196291] [2020-07-21 19:44:50,386 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:44:50,386 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:50,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:44:50,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:44:50,387 INFO L87 Difference]: Start difference. First operand 148 states and 287 transitions. Second operand 17 states. [2020-07-21 19:44:50,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:50,672 INFO L93 Difference]: Finished difference Result 195 states and 407 transitions. [2020-07-21 19:44:50,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:44:50,674 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 405 [2020-07-21 19:44:50,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:50,677 INFO L225 Difference]: With dead ends: 195 [2020-07-21 19:44:50,677 INFO L226 Difference]: Without dead ends: 186 [2020-07-21 19:44:50,678 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 815 GetRequests, 781 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:44:50,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2020-07-21 19:44:50,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 146. [2020-07-21 19:44:50,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2020-07-21 19:44:50,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 276 transitions. [2020-07-21 19:44:50,695 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 276 transitions. Word has length 405 [2020-07-21 19:44:50,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:50,696 INFO L479 AbstractCegarLoop]: Abstraction has 146 states and 276 transitions. [2020-07-21 19:44:50,696 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:44:50,696 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 276 transitions. [2020-07-21 19:44:50,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 421 [2020-07-21 19:44:50,701 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:50,701 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 28, 28, 25, 22, 16, 16, 16, 16, 16, 16, 16, 14, 14, 14, 14, 14, 14, 14, 11, 8, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:50,916 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:50,917 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:50,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:50,918 INFO L82 PathProgramCache]: Analyzing trace with hash -1384117181, now seen corresponding path program 15 times [2020-07-21 19:44:50,918 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:50,918 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [695719535] [2020-07-21 19:44:50,919 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 19:44:51,400 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:51,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:51,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 935 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:44:51,407 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:51,608 INFO L134 CoverageAnalysis]: Checked inductivity of 4999 backedges. 396 proven. 642 refuted. 0 times theorem prover too weak. 3961 trivial. 0 not checked. [2020-07-21 19:44:51,608 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:53,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:54,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:54,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:54,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:54,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:54,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:55,096 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:55,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:55,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:55,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:55,320 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:44:55,551 INFO L134 CoverageAnalysis]: Checked inductivity of 4999 backedges. 400 proven. 662 refuted. 0 times theorem prover too weak. 3937 trivial. 0 not checked. [2020-07-21 19:44:55,551 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [695719535] [2020-07-21 19:44:55,551 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:44:55,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-21 19:44:55,552 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [777797234] [2020-07-21 19:44:55,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 19:44:55,552 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:44:55,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 19:44:55,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:44:55,553 INFO L87 Difference]: Start difference. First operand 146 states and 276 transitions. Second operand 19 states. [2020-07-21 19:44:55,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:44:55,944 INFO L93 Difference]: Finished difference Result 209 states and 434 transitions. [2020-07-21 19:44:55,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:44:55,945 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 420 [2020-07-21 19:44:55,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:44:55,948 INFO L225 Difference]: With dead ends: 209 [2020-07-21 19:44:55,949 INFO L226 Difference]: Without dead ends: 178 [2020-07-21 19:44:55,950 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 846 GetRequests, 807 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-21 19:44:55,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-07-21 19:44:55,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 160. [2020-07-21 19:44:55,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2020-07-21 19:44:55,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 320 transitions. [2020-07-21 19:44:55,967 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 320 transitions. Word has length 420 [2020-07-21 19:44:55,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:44:55,967 INFO L479 AbstractCegarLoop]: Abstraction has 160 states and 320 transitions. [2020-07-21 19:44:55,967 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 19:44:55,968 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 320 transitions. [2020-07-21 19:44:55,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 450 [2020-07-21 19:44:55,973 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:44:55,973 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 30, 30, 27, 25, 17, 17, 17, 17, 17, 17, 17, 15, 15, 15, 15, 15, 15, 15, 12, 8, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:44:56,186 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:44:56,187 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:44:56,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:44:56,188 INFO L82 PathProgramCache]: Analyzing trace with hash -1000768657, now seen corresponding path program 16 times [2020-07-21 19:44:56,188 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:44:56,188 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [663321213] [2020-07-21 19:44:56,189 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 19:44:56,719 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:44:56,720 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:44:56,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 999 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:44:56,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:44:56,937 INFO L134 CoverageAnalysis]: Checked inductivity of 5735 backedges. 633 proven. 622 refuted. 0 times theorem prover too weak. 4480 trivial. 0 not checked. [2020-07-21 19:44:56,937 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:44:59,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:00,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:00,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:01,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:01,466 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:01,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:01,629 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:01,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:02,212 INFO L134 CoverageAnalysis]: Checked inductivity of 5735 backedges. 633 proven. 655 refuted. 0 times theorem prover too weak. 4447 trivial. 0 not checked. [2020-07-21 19:45:02,212 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [663321213] [2020-07-21 19:45:02,213 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:45:02,213 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 19:45:02,213 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1586163917] [2020-07-21 19:45:02,214 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 19:45:02,214 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:45:02,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 19:45:02,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:45:02,214 INFO L87 Difference]: Start difference. First operand 160 states and 320 transitions. Second operand 21 states. [2020-07-21 19:45:02,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:45:02,910 INFO L93 Difference]: Finished difference Result 211 states and 420 transitions. [2020-07-21 19:45:02,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:45:02,912 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 449 [2020-07-21 19:45:02,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:45:02,915 INFO L225 Difference]: With dead ends: 211 [2020-07-21 19:45:02,915 INFO L226 Difference]: Without dead ends: 193 [2020-07-21 19:45:02,919 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 905 GetRequests, 861 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:45:02,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2020-07-21 19:45:02,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 166. [2020-07-21 19:45:02,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2020-07-21 19:45:02,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 322 transitions. [2020-07-21 19:45:02,944 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 322 transitions. Word has length 449 [2020-07-21 19:45:02,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:45:02,945 INFO L479 AbstractCegarLoop]: Abstraction has 166 states and 322 transitions. [2020-07-21 19:45:02,945 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 19:45:02,945 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 322 transitions. [2020-07-21 19:45:02,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 368 [2020-07-21 19:45:02,951 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:45:02,951 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 24, 24, 22, 20, 14, 14, 14, 14, 14, 14, 14, 12, 12, 12, 12, 12, 12, 12, 10, 7, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:45:03,165 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:45:03,166 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:45:03,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:45:03,167 INFO L82 PathProgramCache]: Analyzing trace with hash 1659683269, now seen corresponding path program 17 times [2020-07-21 19:45:03,167 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:45:03,167 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [473143267] [2020-07-21 19:45:03,168 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 19:45:03,669 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:45:03,670 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:45:03,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 817 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:45:03,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:45:03,877 INFO L134 CoverageAnalysis]: Checked inductivity of 3777 backedges. 395 proven. 349 refuted. 0 times theorem prover too weak. 3033 trivial. 0 not checked. [2020-07-21 19:45:03,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:45:05,722 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:05,722 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:06,068 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:06,313 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:06,313 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:06,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:06,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:06,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:06,566 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:06,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:07,089 INFO L134 CoverageAnalysis]: Checked inductivity of 3777 backedges. 397 proven. 361 refuted. 0 times theorem prover too weak. 3019 trivial. 0 not checked. [2020-07-21 19:45:07,089 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [473143267] [2020-07-21 19:45:07,089 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:45:07,089 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 19:45:07,090 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818869227] [2020-07-21 19:45:07,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:45:07,090 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:45:07,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:45:07,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:45:07,091 INFO L87 Difference]: Start difference. First operand 166 states and 322 transitions. Second operand 17 states. [2020-07-21 19:45:07,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:45:07,403 INFO L93 Difference]: Finished difference Result 258 states and 586 transitions. [2020-07-21 19:45:07,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:45:07,404 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 367 [2020-07-21 19:45:07,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:45:07,408 INFO L225 Difference]: With dead ends: 258 [2020-07-21 19:45:07,408 INFO L226 Difference]: Without dead ends: 249 [2020-07-21 19:45:07,411 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 739 GetRequests, 705 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:45:07,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2020-07-21 19:45:07,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 161. [2020-07-21 19:45:07,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 161 states. [2020-07-21 19:45:07,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 302 transitions. [2020-07-21 19:45:07,429 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 302 transitions. Word has length 367 [2020-07-21 19:45:07,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:45:07,429 INFO L479 AbstractCegarLoop]: Abstraction has 161 states and 302 transitions. [2020-07-21 19:45:07,429 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:45:07,429 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 302 transitions. [2020-07-21 19:45:07,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 409 [2020-07-21 19:45:07,433 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:45:07,434 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 28, 28, 24, 23, 15, 15, 15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 10, 8, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:45:07,648 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:45:07,649 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:45:07,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:45:07,650 INFO L82 PathProgramCache]: Analyzing trace with hash 87659688, now seen corresponding path program 18 times [2020-07-21 19:45:07,650 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:45:07,650 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [507608855] [2020-07-21 19:45:07,651 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 19:45:08,171 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:45:08,172 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:45:08,174 INFO L263 TraceCheckSpWp]: Trace formula consists of 908 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:45:08,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:45:08,327 INFO L134 CoverageAnalysis]: Checked inductivity of 4685 backedges. 355 proven. 370 refuted. 0 times theorem prover too weak. 3960 trivial. 0 not checked. [2020-07-21 19:45:08,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:45:09,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:10,029 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:10,031 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:10,189 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:10,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:10,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:10,252 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:10,310 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:10,463 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:10,893 INFO L134 CoverageAnalysis]: Checked inductivity of 4685 backedges. 355 proven. 382 refuted. 0 times theorem prover too weak. 3948 trivial. 0 not checked. [2020-07-21 19:45:10,894 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [507608855] [2020-07-21 19:45:10,894 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:45:10,894 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 19:45:10,894 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098684437] [2020-07-21 19:45:10,895 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 19:45:10,895 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:45:10,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 19:45:10,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:45:10,896 INFO L87 Difference]: Start difference. First operand 161 states and 302 transitions. Second operand 15 states. [2020-07-21 19:45:11,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:45:11,263 INFO L93 Difference]: Finished difference Result 292 states and 718 transitions. [2020-07-21 19:45:11,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:45:11,264 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 408 [2020-07-21 19:45:11,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:45:11,270 INFO L225 Difference]: With dead ends: 292 [2020-07-21 19:45:11,270 INFO L226 Difference]: Without dead ends: 283 [2020-07-21 19:45:11,273 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 820 GetRequests, 791 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 19:45:11,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2020-07-21 19:45:11,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 163. [2020-07-21 19:45:11,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 163 states. [2020-07-21 19:45:11,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 311 transitions. [2020-07-21 19:45:11,295 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 311 transitions. Word has length 408 [2020-07-21 19:45:11,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:45:11,296 INFO L479 AbstractCegarLoop]: Abstraction has 163 states and 311 transitions. [2020-07-21 19:45:11,296 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 19:45:11,296 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 311 transitions. [2020-07-21 19:45:11,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 573 [2020-07-21 19:45:11,301 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:45:11,302 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 38, 38, 34, 33, 22, 22, 22, 22, 22, 22, 22, 19, 19, 19, 19, 19, 19, 19, 14, 12, 12, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:45:11,515 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:45:11,516 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:45:11,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:45:11,516 INFO L82 PathProgramCache]: Analyzing trace with hash -1379110178, now seen corresponding path program 19 times [2020-07-21 19:45:11,517 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:45:11,517 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2069583331] [2020-07-21 19:45:11,517 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 19:45:12,074 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:45:12,074 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:45:12,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 1272 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:45:12,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:45:12,317 INFO L134 CoverageAnalysis]: Checked inductivity of 9469 backedges. 593 proven. 877 refuted. 0 times theorem prover too weak. 7999 trivial. 0 not checked. [2020-07-21 19:45:12,317 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:45:15,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:15,701 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:16,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:16,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:16,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:16,381 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:16,382 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:16,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:16,459 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:16,530 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:16,681 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:17,214 INFO L134 CoverageAnalysis]: Checked inductivity of 9469 backedges. 593 proven. 903 refuted. 0 times theorem prover too weak. 7973 trivial. 0 not checked. [2020-07-21 19:45:17,215 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2069583331] [2020-07-21 19:45:17,215 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:45:17,215 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-21 19:45:17,216 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489379434] [2020-07-21 19:45:17,216 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 19:45:17,217 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:45:17,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 19:45:17,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:45:17,217 INFO L87 Difference]: Start difference. First operand 163 states and 311 transitions. Second operand 19 states. [2020-07-21 19:45:17,796 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:45:17,797 INFO L93 Difference]: Finished difference Result 227 states and 477 transitions. [2020-07-21 19:45:17,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:45:17,798 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 572 [2020-07-21 19:45:17,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:45:17,802 INFO L225 Difference]: With dead ends: 227 [2020-07-21 19:45:17,802 INFO L226 Difference]: Without dead ends: 209 [2020-07-21 19:45:17,805 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1150 GetRequests, 1111 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-21 19:45:17,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2020-07-21 19:45:17,820 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 154. [2020-07-21 19:45:17,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2020-07-21 19:45:17,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 302 transitions. [2020-07-21 19:45:17,823 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 302 transitions. Word has length 572 [2020-07-21 19:45:17,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:45:17,823 INFO L479 AbstractCegarLoop]: Abstraction has 154 states and 302 transitions. [2020-07-21 19:45:17,823 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 19:45:17,823 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 302 transitions. [2020-07-21 19:45:17,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 543 [2020-07-21 19:45:17,829 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:45:17,829 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 38, 38, 31, 30, 20, 20, 20, 20, 20, 20, 20, 19, 19, 19, 19, 19, 19, 19, 12, 10, 10, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:45:18,042 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:45:18,043 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:45:18,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:45:18,044 INFO L82 PathProgramCache]: Analyzing trace with hash -1260162642, now seen corresponding path program 20 times [2020-07-21 19:45:18,045 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:45:18,045 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [710954980] [2020-07-21 19:45:18,045 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 19:45:18,629 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:45:18,630 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:45:18,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 1206 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:45:18,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:45:18,839 INFO L134 CoverageAnalysis]: Checked inductivity of 8436 backedges. 453 proven. 702 refuted. 0 times theorem prover too weak. 7281 trivial. 0 not checked. [2020-07-21 19:45:18,839 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:45:21,367 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:21,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:21,707 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:21,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:21,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:22,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:22,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:22,218 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:22,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:22,871 INFO L134 CoverageAnalysis]: Checked inductivity of 8436 backedges. 453 proven. 718 refuted. 0 times theorem prover too weak. 7265 trivial. 0 not checked. [2020-07-21 19:45:22,872 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [710954980] [2020-07-21 19:45:22,872 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:45:22,872 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 19:45:22,872 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649377616] [2020-07-21 19:45:22,873 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:45:22,873 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:45:22,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:45:22,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:45:22,874 INFO L87 Difference]: Start difference. First operand 154 states and 302 transitions. Second operand 17 states. [2020-07-21 19:45:23,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:45:23,282 INFO L93 Difference]: Finished difference Result 214 states and 460 transitions. [2020-07-21 19:45:23,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:45:23,284 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 542 [2020-07-21 19:45:23,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:45:23,287 INFO L225 Difference]: With dead ends: 214 [2020-07-21 19:45:23,288 INFO L226 Difference]: Without dead ends: 205 [2020-07-21 19:45:23,290 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1089 GetRequests, 1055 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:45:23,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2020-07-21 19:45:23,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 149. [2020-07-21 19:45:23,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2020-07-21 19:45:23,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 284 transitions. [2020-07-21 19:45:23,308 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 284 transitions. Word has length 542 [2020-07-21 19:45:23,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:45:23,309 INFO L479 AbstractCegarLoop]: Abstraction has 149 states and 284 transitions. [2020-07-21 19:45:23,309 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:45:23,309 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 284 transitions. [2020-07-21 19:45:23,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 573 [2020-07-21 19:45:23,315 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:45:23,315 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 41, 41, 34, 33, 21, 21, 21, 21, 21, 21, 21, 20, 20, 20, 20, 20, 20, 20, 14, 12, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:45:23,528 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:45:23,529 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:45:23,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:45:23,530 INFO L82 PathProgramCache]: Analyzing trace with hash 2122481566, now seen corresponding path program 21 times [2020-07-21 19:45:23,530 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:45:23,530 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2075131938] [2020-07-21 19:45:23,531 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 19:45:24,176 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:45:24,176 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:45:24,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 1272 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:45:24,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:45:24,433 INFO L134 CoverageAnalysis]: Checked inductivity of 9413 backedges. 1038 proven. 625 refuted. 0 times theorem prover too weak. 7750 trivial. 0 not checked. [2020-07-21 19:45:24,433 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:45:27,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:27,206 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:28,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:28,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:28,916 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:29,228 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:29,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:29,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:29,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:29,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:29,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:29,651 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:29,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:29,901 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:30,822 INFO L134 CoverageAnalysis]: Checked inductivity of 9413 backedges. 1038 proven. 658 refuted. 0 times theorem prover too weak. 7717 trivial. 0 not checked. [2020-07-21 19:45:30,822 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2075131938] [2020-07-21 19:45:30,822 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:45:30,822 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 19:45:30,823 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745996800] [2020-07-21 19:45:30,823 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 19:45:30,824 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:45:30,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 19:45:30,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:45:30,824 INFO L87 Difference]: Start difference. First operand 149 states and 284 transitions. Second operand 21 states. [2020-07-21 19:45:31,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:45:31,586 INFO L93 Difference]: Finished difference Result 193 states and 366 transitions. [2020-07-21 19:45:31,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:45:31,586 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 572 [2020-07-21 19:45:31,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:45:31,590 INFO L225 Difference]: With dead ends: 193 [2020-07-21 19:45:31,590 INFO L226 Difference]: Without dead ends: 178 [2020-07-21 19:45:31,592 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1151 GetRequests, 1107 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:45:31,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2020-07-21 19:45:31,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 162. [2020-07-21 19:45:31,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2020-07-21 19:45:31,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 300 transitions. [2020-07-21 19:45:31,608 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 300 transitions. Word has length 572 [2020-07-21 19:45:31,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:45:31,609 INFO L479 AbstractCegarLoop]: Abstraction has 162 states and 300 transitions. [2020-07-21 19:45:31,609 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 19:45:31,609 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 300 transitions. [2020-07-21 19:45:31,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 434 [2020-07-21 19:45:31,614 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:45:31,615 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 25, 23, 16, 16, 16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 10, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:45:31,829 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:45:31,830 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:45:31,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:45:31,830 INFO L82 PathProgramCache]: Analyzing trace with hash -745229482, now seen corresponding path program 22 times [2020-07-21 19:45:31,831 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:45:31,831 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [125234715] [2020-07-21 19:45:31,831 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 19:45:32,510 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:45:32,511 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:45:32,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 964 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:45:32,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:45:32,727 INFO L134 CoverageAnalysis]: Checked inductivity of 5297 backedges. 390 proven. 378 refuted. 0 times theorem prover too weak. 4529 trivial. 0 not checked. [2020-07-21 19:45:32,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:45:34,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:34,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:34,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:34,818 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:34,818 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:34,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:34,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:35,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:35,664 INFO L134 CoverageAnalysis]: Checked inductivity of 5297 backedges. 392 proven. 386 refuted. 0 times theorem prover too weak. 4519 trivial. 0 not checked. [2020-07-21 19:45:35,664 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [125234715] [2020-07-21 19:45:35,664 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:45:35,664 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 19:45:35,664 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562242004] [2020-07-21 19:45:35,665 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 19:45:35,665 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:45:35,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 19:45:35,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:45:35,666 INFO L87 Difference]: Start difference. First operand 162 states and 300 transitions. Second operand 15 states. [2020-07-21 19:45:35,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:45:35,999 INFO L93 Difference]: Finished difference Result 269 states and 573 transitions. [2020-07-21 19:45:36,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:45:36,001 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 433 [2020-07-21 19:45:36,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:45:36,005 INFO L225 Difference]: With dead ends: 269 [2020-07-21 19:45:36,006 INFO L226 Difference]: Without dead ends: 257 [2020-07-21 19:45:36,008 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 870 GetRequests, 841 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 19:45:36,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2020-07-21 19:45:36,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 172. [2020-07-21 19:45:36,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2020-07-21 19:45:36,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 342 transitions. [2020-07-21 19:45:36,030 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 342 transitions. Word has length 433 [2020-07-21 19:45:36,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:45:36,031 INFO L479 AbstractCegarLoop]: Abstraction has 172 states and 342 transitions. [2020-07-21 19:45:36,031 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 19:45:36,031 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 342 transitions. [2020-07-21 19:45:36,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 437 [2020-07-21 19:45:36,036 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:45:36,037 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 26, 25, 16, 16, 16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 11, 9, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:45:36,251 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:45:36,252 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:45:36,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:45:36,253 INFO L82 PathProgramCache]: Analyzing trace with hash 531666224, now seen corresponding path program 23 times [2020-07-21 19:45:36,253 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:45:36,253 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1626748631] [2020-07-21 19:45:36,253 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 19:45:36,853 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:45:36,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:45:36,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 970 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:45:36,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:45:37,066 INFO L134 CoverageAnalysis]: Checked inductivity of 5369 backedges. 627 proven. 447 refuted. 0 times theorem prover too weak. 4295 trivial. 0 not checked. [2020-07-21 19:45:37,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:45:39,350 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:39,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:39,898 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:39,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:40,238 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:40,239 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:40,469 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:40,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:40,675 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:40,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:41,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:41,543 INFO L134 CoverageAnalysis]: Checked inductivity of 5369 backedges. 629 proven. 469 refuted. 0 times theorem prover too weak. 4271 trivial. 0 not checked. [2020-07-21 19:45:41,544 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1626748631] [2020-07-21 19:45:41,544 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:45:41,544 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-21 19:45:41,544 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [711529842] [2020-07-21 19:45:41,545 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 19:45:41,545 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:45:41,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 19:45:41,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:45:41,546 INFO L87 Difference]: Start difference. First operand 172 states and 342 transitions. Second operand 19 states. [2020-07-21 19:45:42,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:45:42,153 INFO L93 Difference]: Finished difference Result 209 states and 413 transitions. [2020-07-21 19:45:42,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:45:42,154 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 436 [2020-07-21 19:45:42,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:45:42,157 INFO L225 Difference]: With dead ends: 209 [2020-07-21 19:45:42,157 INFO L226 Difference]: Without dead ends: 191 [2020-07-21 19:45:42,159 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 878 GetRequests, 839 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-21 19:45:42,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2020-07-21 19:45:42,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 182. [2020-07-21 19:45:42,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2020-07-21 19:45:42,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 372 transitions. [2020-07-21 19:45:42,178 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 372 transitions. Word has length 436 [2020-07-21 19:45:42,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:45:42,179 INFO L479 AbstractCegarLoop]: Abstraction has 182 states and 372 transitions. [2020-07-21 19:45:42,179 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 19:45:42,179 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 372 transitions. [2020-07-21 19:45:42,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 420 [2020-07-21 19:45:42,185 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:45:42,185 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 29, 29, 24, 22, 16, 16, 16, 16, 16, 16, 16, 14, 14, 14, 14, 14, 14, 14, 10, 8, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:45:42,399 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:45:42,400 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:45:42,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:45:42,401 INFO L82 PathProgramCache]: Analyzing trace with hash 340777747, now seen corresponding path program 24 times [2020-07-21 19:45:42,401 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:45:42,401 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1092425946] [2020-07-21 19:45:42,401 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 19:45:43,003 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:45:43,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:45:43,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 933 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:45:43,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:45:43,242 INFO L134 CoverageAnalysis]: Checked inductivity of 4959 backedges. 472 proven. 400 refuted. 0 times theorem prover too weak. 4087 trivial. 0 not checked. [2020-07-21 19:45:43,242 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:45:45,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:45,256 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:45,542 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:45,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:45,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:45,716 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:45,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:45,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:45,884 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:45,885 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:45,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:46,132 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:46,578 INFO L134 CoverageAnalysis]: Checked inductivity of 4959 backedges. 476 proven. 410 refuted. 0 times theorem prover too weak. 4073 trivial. 0 not checked. [2020-07-21 19:45:46,578 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1092425946] [2020-07-21 19:45:46,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:45:46,579 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 19:45:46,579 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1709347802] [2020-07-21 19:45:46,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:45:46,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:45:46,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:45:46,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:45:46,580 INFO L87 Difference]: Start difference. First operand 182 states and 372 transitions. Second operand 17 states. [2020-07-21 19:45:47,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:45:47,149 INFO L93 Difference]: Finished difference Result 224 states and 455 transitions. [2020-07-21 19:45:47,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:45:47,150 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 419 [2020-07-21 19:45:47,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:45:47,154 INFO L225 Difference]: With dead ends: 224 [2020-07-21 19:45:47,154 INFO L226 Difference]: Without dead ends: 212 [2020-07-21 19:45:47,156 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 843 GetRequests, 809 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:45:47,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2020-07-21 19:45:47,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 172. [2020-07-21 19:45:47,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2020-07-21 19:45:47,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 330 transitions. [2020-07-21 19:45:47,177 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 330 transitions. Word has length 419 [2020-07-21 19:45:47,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:45:47,177 INFO L479 AbstractCegarLoop]: Abstraction has 172 states and 330 transitions. [2020-07-21 19:45:47,177 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:45:47,178 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 330 transitions. [2020-07-21 19:45:47,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 410 [2020-07-21 19:45:47,183 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:45:47,183 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 29, 29, 24, 24, 15, 15, 15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 10, 9, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:45:47,398 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:45:47,399 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:45:47,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:45:47,400 INFO L82 PathProgramCache]: Analyzing trace with hash -1291489318, now seen corresponding path program 25 times [2020-07-21 19:45:47,400 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:45:47,400 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [780573791] [2020-07-21 19:45:47,401 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 19:45:48,012 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:45:48,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:45:48,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 910 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:45:48,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:45:48,249 INFO L134 CoverageAnalysis]: Checked inductivity of 4700 backedges. 660 proven. 207 refuted. 0 times theorem prover too weak. 3833 trivial. 0 not checked. [2020-07-21 19:45:48,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:45:49,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:49,856 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:50,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:50,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:50,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:50,810 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:50,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:50,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:51,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:52,285 INFO L134 CoverageAnalysis]: Checked inductivity of 4700 backedges. 664 proven. 219 refuted. 0 times theorem prover too weak. 3817 trivial. 0 not checked. [2020-07-21 19:45:52,285 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [780573791] [2020-07-21 19:45:52,285 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:45:52,286 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 19:45:52,286 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011625631] [2020-07-21 19:45:52,286 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:45:52,286 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:45:52,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:45:52,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:45:52,287 INFO L87 Difference]: Start difference. First operand 172 states and 330 transitions. Second operand 17 states. [2020-07-21 19:45:52,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:45:52,739 INFO L93 Difference]: Finished difference Result 259 states and 589 transitions. [2020-07-21 19:45:52,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:45:52,741 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 409 [2020-07-21 19:45:52,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:45:52,746 INFO L225 Difference]: With dead ends: 259 [2020-07-21 19:45:52,747 INFO L226 Difference]: Without dead ends: 244 [2020-07-21 19:45:52,750 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 823 GetRequests, 789 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:45:52,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2020-07-21 19:45:52,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 197. [2020-07-21 19:45:52,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2020-07-21 19:45:52,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 429 transitions. [2020-07-21 19:45:52,775 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 429 transitions. Word has length 409 [2020-07-21 19:45:52,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:45:52,776 INFO L479 AbstractCegarLoop]: Abstraction has 197 states and 429 transitions. [2020-07-21 19:45:52,776 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:45:52,776 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 429 transitions. [2020-07-21 19:45:52,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 407 [2020-07-21 19:45:52,783 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:45:52,783 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 28, 28, 23, 22, 15, 15, 15, 15, 15, 15, 15, 14, 14, 14, 14, 14, 14, 14, 9, 8, 8, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:45:52,996 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:45:52,997 INFO L427 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:45:52,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:45:52,998 INFO L82 PathProgramCache]: Analyzing trace with hash 252523350, now seen corresponding path program 26 times [2020-07-21 19:45:52,998 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:45:52,998 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [962089129] [2020-07-21 19:45:52,998 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 19:45:53,610 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:45:53,611 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:45:53,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 904 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:45:53,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:45:53,793 INFO L134 CoverageAnalysis]: Checked inductivity of 4640 backedges. 389 proven. 313 refuted. 0 times theorem prover too weak. 3938 trivial. 0 not checked. [2020-07-21 19:45:53,793 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:45:55,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:55,571 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:55,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:55,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:55,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:55,806 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:55,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:55,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:56,191 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:45:56,698 INFO L134 CoverageAnalysis]: Checked inductivity of 4640 backedges. 389 proven. 323 refuted. 0 times theorem prover too weak. 3928 trivial. 0 not checked. [2020-07-21 19:45:56,699 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [962089129] [2020-07-21 19:45:56,699 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:45:56,699 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 19:45:56,700 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [897821412] [2020-07-21 19:45:56,700 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 19:45:56,701 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:45:56,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 19:45:56,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:45:56,701 INFO L87 Difference]: Start difference. First operand 197 states and 429 transitions. Second operand 15 states. [2020-07-21 19:45:57,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:45:57,090 INFO L93 Difference]: Finished difference Result 303 states and 711 transitions. [2020-07-21 19:45:57,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:45:57,092 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 406 [2020-07-21 19:45:57,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:45:57,097 INFO L225 Difference]: With dead ends: 303 [2020-07-21 19:45:57,097 INFO L226 Difference]: Without dead ends: 291 [2020-07-21 19:45:57,101 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 816 GetRequests, 787 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 19:45:57,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291 states. [2020-07-21 19:45:57,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291 to 194. [2020-07-21 19:45:57,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 194 states. [2020-07-21 19:45:57,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 420 transitions. [2020-07-21 19:45:57,124 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 420 transitions. Word has length 406 [2020-07-21 19:45:57,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:45:57,125 INFO L479 AbstractCegarLoop]: Abstraction has 194 states and 420 transitions. [2020-07-21 19:45:57,125 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 19:45:57,125 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 420 transitions. [2020-07-21 19:45:57,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 496 [2020-07-21 19:45:57,133 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:45:57,133 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 32, 32, 25, 25, 20, 20, 20, 20, 20, 20, 20, 16, 16, 16, 16, 16, 16, 16, 16, 9, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:45:57,334 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:45:57,335 INFO L427 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:45:57,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:45:57,335 INFO L82 PathProgramCache]: Analyzing trace with hash 1822576147, now seen corresponding path program 27 times [2020-07-21 19:45:57,336 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:45:57,336 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [811293137] [2020-07-21 19:45:57,336 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 19:45:57,992 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:45:57,993 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:45:57,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 1103 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:45:58,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:45:58,296 INFO L134 CoverageAnalysis]: Checked inductivity of 7104 backedges. 883 proven. 350 refuted. 0 times theorem prover too weak. 5871 trivial. 0 not checked. [2020-07-21 19:45:58,296 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:46:00,578 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:00,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:01,415 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:01,819 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:02,052 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:02,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:02,288 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:02,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:03,531 INFO L134 CoverageAnalysis]: Checked inductivity of 7104 backedges. 887 proven. 367 refuted. 0 times theorem prover too weak. 5850 trivial. 0 not checked. [2020-07-21 19:46:03,531 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [811293137] [2020-07-21 19:46:03,531 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:46:03,532 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-21 19:46:03,532 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [875957169] [2020-07-21 19:46:03,532 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 19:46:03,533 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:46:03,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 19:46:03,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:46:03,533 INFO L87 Difference]: Start difference. First operand 194 states and 420 transitions. Second operand 19 states. [2020-07-21 19:46:03,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:46:03,919 INFO L93 Difference]: Finished difference Result 268 states and 618 transitions. [2020-07-21 19:46:03,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:46:03,920 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 495 [2020-07-21 19:46:03,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:46:03,925 INFO L225 Difference]: With dead ends: 268 [2020-07-21 19:46:03,925 INFO L226 Difference]: Without dead ends: 253 [2020-07-21 19:46:03,928 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 996 GetRequests, 957 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-21 19:46:03,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 253 states. [2020-07-21 19:46:03,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 253 to 182. [2020-07-21 19:46:03,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2020-07-21 19:46:03,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 365 transitions. [2020-07-21 19:46:03,943 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 365 transitions. Word has length 495 [2020-07-21 19:46:03,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:46:03,944 INFO L479 AbstractCegarLoop]: Abstraction has 182 states and 365 transitions. [2020-07-21 19:46:03,944 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 19:46:03,944 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 365 transitions. [2020-07-21 19:46:03,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 449 [2020-07-21 19:46:03,948 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:46:03,948 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 32, 26, 25, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 10, 9, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:46:04,148 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:46:04,149 INFO L427 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:46:04,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:46:04,150 INFO L82 PathProgramCache]: Analyzing trace with hash 42159611, now seen corresponding path program 28 times [2020-07-21 19:46:04,150 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:46:04,150 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1023132280] [2020-07-21 19:46:04,150 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 19:46:04,884 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:46:04,884 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:46:04,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 997 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:46:04,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:46:05,206 INFO L134 CoverageAnalysis]: Checked inductivity of 5681 backedges. 674 proven. 262 refuted. 0 times theorem prover too weak. 4745 trivial. 0 not checked. [2020-07-21 19:46:05,207 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:46:07,145 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:07,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:07,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:07,711 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:08,010 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:08,010 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:08,217 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:08,218 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:08,309 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:08,384 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:08,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:09,742 INFO L134 CoverageAnalysis]: Checked inductivity of 5681 backedges. 676 proven. 276 refuted. 0 times theorem prover too weak. 4729 trivial. 0 not checked. [2020-07-21 19:46:09,742 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1023132280] [2020-07-21 19:46:09,742 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:46:09,743 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 19:46:09,743 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012385032] [2020-07-21 19:46:09,743 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:46:09,743 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:46:09,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:46:09,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:46:09,744 INFO L87 Difference]: Start difference. First operand 182 states and 365 transitions. Second operand 17 states. [2020-07-21 19:46:10,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:46:10,189 INFO L93 Difference]: Finished difference Result 291 states and 675 transitions. [2020-07-21 19:46:10,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:46:10,191 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 448 [2020-07-21 19:46:10,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:46:10,196 INFO L225 Difference]: With dead ends: 291 [2020-07-21 19:46:10,197 INFO L226 Difference]: Without dead ends: 276 [2020-07-21 19:46:10,200 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 901 GetRequests, 867 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:46:10,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2020-07-21 19:46:10,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 177. [2020-07-21 19:46:10,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 177 states. [2020-07-21 19:46:10,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 342 transitions. [2020-07-21 19:46:10,222 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 342 transitions. Word has length 448 [2020-07-21 19:46:10,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:46:10,223 INFO L479 AbstractCegarLoop]: Abstraction has 177 states and 342 transitions. [2020-07-21 19:46:10,223 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:46:10,223 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 342 transitions. [2020-07-21 19:46:10,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 465 [2020-07-21 19:46:10,229 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:46:10,229 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 28, 27, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 12, 10, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:46:10,434 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:46:10,435 INFO L427 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:46:10,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:46:10,436 INFO L82 PathProgramCache]: Analyzing trace with hash -1853918140, now seen corresponding path program 29 times [2020-07-21 19:46:10,436 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:46:10,436 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1988792128] [2020-07-21 19:46:10,437 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 19:46:11,172 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:46:11,172 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:46:11,174 INFO L263 TraceCheckSpWp]: Trace formula consists of 1032 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:46:11,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:46:11,322 INFO L134 CoverageAnalysis]: Checked inductivity of 6109 backedges. 589 proven. 243 refuted. 0 times theorem prover too weak. 5277 trivial. 0 not checked. [2020-07-21 19:46:11,322 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:46:12,285 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:12,723 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:12,974 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:12,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:13,056 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:13,136 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:13,441 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:14,428 INFO L134 CoverageAnalysis]: Checked inductivity of 6109 backedges. 591 proven. 251 refuted. 0 times theorem prover too weak. 5267 trivial. 0 not checked. [2020-07-21 19:46:14,428 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1988792128] [2020-07-21 19:46:14,428 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:46:14,429 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 19:46:14,429 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698691183] [2020-07-21 19:46:14,429 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 19:46:14,429 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:46:14,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 19:46:14,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:46:14,430 INFO L87 Difference]: Start difference. First operand 177 states and 342 transitions. Second operand 15 states. [2020-07-21 19:46:14,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:46:14,841 INFO L93 Difference]: Finished difference Result 308 states and 781 transitions. [2020-07-21 19:46:14,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:46:14,842 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 464 [2020-07-21 19:46:14,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:46:14,849 INFO L225 Difference]: With dead ends: 308 [2020-07-21 19:46:14,849 INFO L226 Difference]: Without dead ends: 293 [2020-07-21 19:46:14,853 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 932 GetRequests, 903 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 19:46:14,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2020-07-21 19:46:14,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 179. [2020-07-21 19:46:14,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2020-07-21 19:46:14,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 354 transitions. [2020-07-21 19:46:14,870 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 354 transitions. Word has length 464 [2020-07-21 19:46:14,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:46:14,871 INFO L479 AbstractCegarLoop]: Abstraction has 179 states and 354 transitions. [2020-07-21 19:46:14,871 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 19:46:14,871 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 354 transitions. [2020-07-21 19:46:14,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 489 [2020-07-21 19:46:14,875 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:46:14,875 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 35, 28, 27, 18, 18, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 11, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:46:15,076 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:46:15,076 INFO L427 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:46:15,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:46:15,077 INFO L82 PathProgramCache]: Analyzing trace with hash -424447616, now seen corresponding path program 30 times [2020-07-21 19:46:15,077 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:46:15,078 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [355095358] [2020-07-21 19:46:15,078 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 19:46:15,807 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:46:15,807 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:46:15,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 1086 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:46:15,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:46:16,040 INFO L134 CoverageAnalysis]: Checked inductivity of 6785 backedges. 890 proven. 330 refuted. 0 times theorem prover too weak. 5565 trivial. 0 not checked. [2020-07-21 19:46:16,040 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:46:18,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:19,380 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:19,381 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:19,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:20,140 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:20,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:20,361 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:20,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:20,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:21,563 INFO L134 CoverageAnalysis]: Checked inductivity of 6785 backedges. 892 proven. 352 refuted. 0 times theorem prover too weak. 5541 trivial. 0 not checked. [2020-07-21 19:46:21,564 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [355095358] [2020-07-21 19:46:21,564 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:46:21,564 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-21 19:46:21,564 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001877411] [2020-07-21 19:46:21,565 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 19:46:21,565 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:46:21,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 19:46:21,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:46:21,565 INFO L87 Difference]: Start difference. First operand 179 states and 354 transitions. Second operand 19 states. [2020-07-21 19:46:22,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:46:22,069 INFO L93 Difference]: Finished difference Result 228 states and 448 transitions. [2020-07-21 19:46:22,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:46:22,071 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 488 [2020-07-21 19:46:22,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:46:22,074 INFO L225 Difference]: With dead ends: 228 [2020-07-21 19:46:22,074 INFO L226 Difference]: Without dead ends: 213 [2020-07-21 19:46:22,076 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 982 GetRequests, 943 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-21 19:46:22,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2020-07-21 19:46:22,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 171. [2020-07-21 19:46:22,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2020-07-21 19:46:22,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 336 transitions. [2020-07-21 19:46:22,089 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 336 transitions. Word has length 488 [2020-07-21 19:46:22,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:46:22,089 INFO L479 AbstractCegarLoop]: Abstraction has 171 states and 336 transitions. [2020-07-21 19:46:22,089 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 19:46:22,089 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 336 transitions. [2020-07-21 19:46:22,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 461 [2020-07-21 19:46:22,093 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:46:22,093 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 26, 25, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 9, 9, 9, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:46:22,293 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:46:22,294 INFO L427 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:46:22,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:46:22,295 INFO L82 PathProgramCache]: Analyzing trace with hash -763699702, now seen corresponding path program 31 times [2020-07-21 19:46:22,295 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:46:22,295 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [679614589] [2020-07-21 19:46:22,295 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 19:46:22,985 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:46:22,986 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:46:22,988 INFO L263 TraceCheckSpWp]: Trace formula consists of 1024 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:46:22,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:46:23,176 INFO L134 CoverageAnalysis]: Checked inductivity of 6005 backedges. 700 proven. 268 refuted. 0 times theorem prover too weak. 5037 trivial. 0 not checked. [2020-07-21 19:46:23,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:46:25,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:25,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:25,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:26,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:26,009 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:26,188 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:26,189 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:26,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:26,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:26,385 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:26,707 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:27,807 INFO L134 CoverageAnalysis]: Checked inductivity of 6005 backedges. 704 proven. 278 refuted. 0 times theorem prover too weak. 5023 trivial. 0 not checked. [2020-07-21 19:46:27,807 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [679614589] [2020-07-21 19:46:27,808 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:46:27,808 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 19:46:27,808 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2109391903] [2020-07-21 19:46:27,808 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:46:27,809 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:46:27,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:46:27,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:46:27,809 INFO L87 Difference]: Start difference. First operand 171 states and 336 transitions. Second operand 17 states. [2020-07-21 19:46:28,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:46:28,359 INFO L93 Difference]: Finished difference Result 239 states and 488 transitions. [2020-07-21 19:46:28,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:46:28,361 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 460 [2020-07-21 19:46:28,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:46:28,365 INFO L225 Difference]: With dead ends: 239 [2020-07-21 19:46:28,365 INFO L226 Difference]: Without dead ends: 224 [2020-07-21 19:46:28,370 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 925 GetRequests, 891 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:46:28,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2020-07-21 19:46:28,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 164. [2020-07-21 19:46:28,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2020-07-21 19:46:28,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 307 transitions. [2020-07-21 19:46:28,389 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 307 transitions. Word has length 460 [2020-07-21 19:46:28,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:46:28,389 INFO L479 AbstractCegarLoop]: Abstraction has 164 states and 307 transitions. [2020-07-21 19:46:28,389 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:46:28,390 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 307 transitions. [2020-07-21 19:46:28,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 423 [2020-07-21 19:46:28,394 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:46:28,395 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 30, 30, 25, 24, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 10, 9, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:46:28,604 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:46:28,605 INFO L427 AbstractCegarLoop]: === Iteration 49 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:46:28,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:46:28,606 INFO L82 PathProgramCache]: Analyzing trace with hash -1055008279, now seen corresponding path program 32 times [2020-07-21 19:46:28,606 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:46:28,607 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1753263815] [2020-07-21 19:46:28,607 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 19:46:29,306 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:46:29,306 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:46:29,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 939 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:46:29,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:46:29,437 INFO L134 CoverageAnalysis]: Checked inductivity of 5016 backedges. 600 proven. 149 refuted. 0 times theorem prover too weak. 4267 trivial. 0 not checked. [2020-07-21 19:46:29,437 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:46:30,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:30,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:30,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:30,736 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:30,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:30,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:31,011 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:31,012 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:31,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:31,511 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:32,564 INFO L134 CoverageAnalysis]: Checked inductivity of 5016 backedges. 600 proven. 161 refuted. 0 times theorem prover too weak. 4255 trivial. 0 not checked. [2020-07-21 19:46:32,565 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1753263815] [2020-07-21 19:46:32,565 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:46:32,565 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 19:46:32,565 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [27710951] [2020-07-21 19:46:32,566 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 19:46:32,566 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:46:32,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 19:46:32,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:46:32,566 INFO L87 Difference]: Start difference. First operand 164 states and 307 transitions. Second operand 15 states. [2020-07-21 19:46:32,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:46:32,942 INFO L93 Difference]: Finished difference Result 256 states and 573 transitions. [2020-07-21 19:46:32,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:46:32,944 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 422 [2020-07-21 19:46:32,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:46:32,948 INFO L225 Difference]: With dead ends: 256 [2020-07-21 19:46:32,949 INFO L226 Difference]: Without dead ends: 244 [2020-07-21 19:46:32,950 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 848 GetRequests, 819 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 19:46:32,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2020-07-21 19:46:32,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 174. [2020-07-21 19:46:32,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2020-07-21 19:46:32,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 349 transitions. [2020-07-21 19:46:32,965 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 349 transitions. Word has length 422 [2020-07-21 19:46:32,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:46:32,965 INFO L479 AbstractCegarLoop]: Abstraction has 174 states and 349 transitions. [2020-07-21 19:46:32,965 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 19:46:32,965 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 349 transitions. [2020-07-21 19:46:32,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 489 [2020-07-21 19:46:32,969 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:46:32,969 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 35, 29, 26, 18, 18, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 12, 9, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:46:33,171 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:46:33,172 INFO L427 AbstractCegarLoop]: === Iteration 50 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:46:33,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:46:33,173 INFO L82 PathProgramCache]: Analyzing trace with hash 1049621216, now seen corresponding path program 33 times [2020-07-21 19:46:33,173 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:46:33,173 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1997664648] [2020-07-21 19:46:33,173 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 19:46:33,949 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:46:33,950 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:46:33,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 1086 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:46:33,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:46:34,196 INFO L134 CoverageAnalysis]: Checked inductivity of 6787 backedges. 854 proven. 254 refuted. 0 times theorem prover too weak. 5679 trivial. 0 not checked. [2020-07-21 19:46:34,196 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:46:36,089 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:36,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:36,761 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:36,762 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:36,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:36,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:36,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:36,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:37,005 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:37,052 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:37,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:38,551 INFO L134 CoverageAnalysis]: Checked inductivity of 6787 backedges. 854 proven. 274 refuted. 0 times theorem prover too weak. 5659 trivial. 0 not checked. [2020-07-21 19:46:38,551 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1997664648] [2020-07-21 19:46:38,552 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:46:38,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 19:46:38,552 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542827165] [2020-07-21 19:46:38,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:46:38,552 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:46:38,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:46:38,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:46:38,553 INFO L87 Difference]: Start difference. First operand 174 states and 349 transitions. Second operand 17 states. [2020-07-21 19:46:39,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:46:39,050 INFO L93 Difference]: Finished difference Result 245 states and 541 transitions. [2020-07-21 19:46:39,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:46:39,050 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 488 [2020-07-21 19:46:39,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:46:39,055 INFO L225 Difference]: With dead ends: 245 [2020-07-21 19:46:39,055 INFO L226 Difference]: Without dead ends: 224 [2020-07-21 19:46:39,056 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 981 GetRequests, 947 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:46:39,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2020-07-21 19:46:39,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 194. [2020-07-21 19:46:39,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 194 states. [2020-07-21 19:46:39,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 401 transitions. [2020-07-21 19:46:39,077 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 401 transitions. Word has length 488 [2020-07-21 19:46:39,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:46:39,078 INFO L479 AbstractCegarLoop]: Abstraction has 194 states and 401 transitions. [2020-07-21 19:46:39,078 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:46:39,078 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 401 transitions. [2020-07-21 19:46:39,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 453 [2020-07-21 19:46:39,084 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:46:39,084 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 31, 31, 30, 25, 17, 17, 17, 17, 17, 17, 17, 15, 15, 15, 15, 15, 15, 15, 15, 8, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:46:39,298 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:46:39,299 INFO L427 AbstractCegarLoop]: === Iteration 51 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:46:39,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:46:39,300 INFO L82 PathProgramCache]: Analyzing trace with hash -70185521, now seen corresponding path program 34 times [2020-07-21 19:46:39,300 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:46:39,301 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1631549261] [2020-07-21 19:46:39,301 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 19:46:40,069 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:46:40,069 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:46:40,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 1005 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:46:40,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:46:40,287 INFO L134 CoverageAnalysis]: Checked inductivity of 5803 backedges. 342 proven. 630 refuted. 0 times theorem prover too weak. 4831 trivial. 0 not checked. [2020-07-21 19:46:40,287 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:46:42,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:42,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:43,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:43,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:43,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:43,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:43,823 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:43,823 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:43,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:43,913 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:43,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:44,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:44,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:44,479 INFO L134 CoverageAnalysis]: Checked inductivity of 5803 backedges. 348 proven. 642 refuted. 0 times theorem prover too weak. 4813 trivial. 0 not checked. [2020-07-21 19:46:44,479 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1631549261] [2020-07-21 19:46:44,480 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:46:44,480 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 19:46:44,480 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913944791] [2020-07-21 19:46:44,480 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:46:44,480 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:46:44,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:46:44,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:46:44,481 INFO L87 Difference]: Start difference. First operand 194 states and 401 transitions. Second operand 17 states. [2020-07-21 19:46:44,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:46:44,991 INFO L93 Difference]: Finished difference Result 245 states and 499 transitions. [2020-07-21 19:46:44,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:46:44,993 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 452 [2020-07-21 19:46:44,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:46:44,998 INFO L225 Difference]: With dead ends: 245 [2020-07-21 19:46:44,998 INFO L226 Difference]: Without dead ends: 225 [2020-07-21 19:46:44,999 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 909 GetRequests, 875 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:46:45,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2020-07-21 19:46:45,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 197. [2020-07-21 19:46:45,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2020-07-21 19:46:45,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 404 transitions. [2020-07-21 19:46:45,019 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 404 transitions. Word has length 452 [2020-07-21 19:46:45,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:46:45,019 INFO L479 AbstractCegarLoop]: Abstraction has 197 states and 404 transitions. [2020-07-21 19:46:45,020 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:46:45,020 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 404 transitions. [2020-07-21 19:46:45,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 479 [2020-07-21 19:46:45,026 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:46:45,027 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 33, 33, 29, 28, 18, 18, 18, 18, 18, 18, 18, 16, 16, 16, 16, 16, 16, 16, 13, 10, 7, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:46:45,239 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:46:45,240 INFO L427 AbstractCegarLoop]: === Iteration 52 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:46:45,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:46:45,241 INFO L82 PathProgramCache]: Analyzing trace with hash 633324963, now seen corresponding path program 35 times [2020-07-21 19:46:45,241 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:46:45,241 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2045102592] [2020-07-21 19:46:45,242 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 19:46:46,031 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:46:46,031 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:46:46,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 1063 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:46:46,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:46:46,252 INFO L134 CoverageAnalysis]: Checked inductivity of 6508 backedges. 516 proven. 518 refuted. 0 times theorem prover too weak. 5474 trivial. 0 not checked. [2020-07-21 19:46:46,252 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:46:49,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:49,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:49,480 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:49,730 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:49,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:49,901 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:50,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:50,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:50,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:50,128 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:50,403 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:51,040 INFO L134 CoverageAnalysis]: Checked inductivity of 6508 backedges. 520 proven. 532 refuted. 0 times theorem prover too weak. 5456 trivial. 0 not checked. [2020-07-21 19:46:51,040 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2045102592] [2020-07-21 19:46:51,040 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:46:51,041 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 19:46:51,041 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982264228] [2020-07-21 19:46:51,041 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:46:51,041 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:46:51,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:46:51,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:46:51,042 INFO L87 Difference]: Start difference. First operand 197 states and 404 transitions. Second operand 17 states. [2020-07-21 19:46:51,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:46:51,581 INFO L93 Difference]: Finished difference Result 228 states and 474 transitions. [2020-07-21 19:46:51,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:46:51,583 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 478 [2020-07-21 19:46:51,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:46:51,587 INFO L225 Difference]: With dead ends: 228 [2020-07-21 19:46:51,588 INFO L226 Difference]: Without dead ends: 213 [2020-07-21 19:46:51,589 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 961 GetRequests, 927 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:46:51,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2020-07-21 19:46:51,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 189. [2020-07-21 19:46:51,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 189 states. [2020-07-21 19:46:51,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 385 transitions. [2020-07-21 19:46:51,607 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 385 transitions. Word has length 478 [2020-07-21 19:46:51,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:46:51,608 INFO L479 AbstractCegarLoop]: Abstraction has 189 states and 385 transitions. [2020-07-21 19:46:51,608 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:46:51,608 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 385 transitions. [2020-07-21 19:46:51,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 513 [2020-07-21 19:46:51,613 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:46:51,613 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 33, 33, 28, 27, 21, 21, 21, 21, 21, 21, 21, 16, 16, 16, 16, 16, 16, 16, 14, 12, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:46:51,813 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:46:51,814 INFO L427 AbstractCegarLoop]: === Iteration 53 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:46:51,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:46:51,815 INFO L82 PathProgramCache]: Analyzing trace with hash 2115799608, now seen corresponding path program 36 times [2020-07-21 19:46:51,815 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:46:51,815 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [114693425] [2020-07-21 19:46:51,815 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 19:46:52,585 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:46:52,585 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:46:52,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 1140 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:46:52,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:46:52,819 INFO L134 CoverageAnalysis]: Checked inductivity of 7605 backedges. 789 proven. 306 refuted. 0 times theorem prover too weak. 6510 trivial. 0 not checked. [2020-07-21 19:46:52,820 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:46:54,446 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:54,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:55,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:55,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:55,454 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:55,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:55,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:55,856 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:56,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:46:57,740 INFO L134 CoverageAnalysis]: Checked inductivity of 7605 backedges. 793 proven. 318 refuted. 0 times theorem prover too weak. 6494 trivial. 0 not checked. [2020-07-21 19:46:57,741 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [114693425] [2020-07-21 19:46:57,741 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:46:57,741 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 19:46:57,741 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1036526189] [2020-07-21 19:46:57,742 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:46:57,742 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:46:57,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:46:57,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:46:57,742 INFO L87 Difference]: Start difference. First operand 189 states and 385 transitions. Second operand 17 states. [2020-07-21 19:46:58,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:46:58,207 INFO L93 Difference]: Finished difference Result 220 states and 446 transitions. [2020-07-21 19:46:58,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:46:58,210 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 512 [2020-07-21 19:46:58,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:46:58,213 INFO L225 Difference]: With dead ends: 220 [2020-07-21 19:46:58,213 INFO L226 Difference]: Without dead ends: 208 [2020-07-21 19:46:58,214 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1029 GetRequests, 995 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:46:58,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2020-07-21 19:46:58,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 174. [2020-07-21 19:46:58,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 174 states. [2020-07-21 19:46:58,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 323 transitions. [2020-07-21 19:46:58,228 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 323 transitions. Word has length 512 [2020-07-21 19:46:58,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:46:58,229 INFO L479 AbstractCegarLoop]: Abstraction has 174 states and 323 transitions. [2020-07-21 19:46:58,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:46:58,229 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 323 transitions. [2020-07-21 19:46:58,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-21 19:46:58,233 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:46:58,234 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 35, 28, 26, 18, 18, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 11, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:46:58,446 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:46:58,447 INFO L427 AbstractCegarLoop]: === Iteration 54 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:46:58,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:46:58,448 INFO L82 PathProgramCache]: Analyzing trace with hash -663797844, now seen corresponding path program 37 times [2020-07-21 19:46:58,448 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:46:58,448 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [904017481] [2020-07-21 19:46:58,449 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 19:46:59,278 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:46:59,278 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:46:59,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 1084 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:46:59,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:46:59,522 INFO L134 CoverageAnalysis]: Checked inductivity of 6759 backedges. 940 proven. 274 refuted. 0 times theorem prover too weak. 5545 trivial. 0 not checked. [2020-07-21 19:46:59,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:47:02,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:02,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:03,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:03,266 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:03,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:03,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:03,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:03,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:04,129 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:05,434 INFO L134 CoverageAnalysis]: Checked inductivity of 6759 backedges. 944 proven. 296 refuted. 0 times theorem prover too weak. 5519 trivial. 0 not checked. [2020-07-21 19:47:05,434 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [904017481] [2020-07-21 19:47:05,434 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:47:05,435 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 19:47:05,435 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416288504] [2020-07-21 19:47:05,435 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 19:47:05,435 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:47:05,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 19:47:05,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 19:47:05,436 INFO L87 Difference]: Start difference. First operand 174 states and 323 transitions. Second operand 20 states. [2020-07-21 19:47:06,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:47:06,158 INFO L93 Difference]: Finished difference Result 269 states and 568 transitions. [2020-07-21 19:47:06,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:47:06,161 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 487 [2020-07-21 19:47:06,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:47:06,166 INFO L225 Difference]: With dead ends: 269 [2020-07-21 19:47:06,166 INFO L226 Difference]: Without dead ends: 254 [2020-07-21 19:47:06,168 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 980 GetRequests, 941 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 19:47:06,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2020-07-21 19:47:06,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 179. [2020-07-21 19:47:06,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2020-07-21 19:47:06,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 347 transitions. [2020-07-21 19:47:06,183 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 347 transitions. Word has length 487 [2020-07-21 19:47:06,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:47:06,184 INFO L479 AbstractCegarLoop]: Abstraction has 179 states and 347 transitions. [2020-07-21 19:47:06,184 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 19:47:06,184 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 347 transitions. [2020-07-21 19:47:06,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 476 [2020-07-21 19:47:06,187 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:47:06,187 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 33, 33, 28, 26, 18, 18, 18, 18, 18, 18, 18, 16, 16, 16, 16, 16, 16, 16, 12, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:47:06,388 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:47:06,388 INFO L427 AbstractCegarLoop]: === Iteration 55 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:47:06,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:47:06,389 INFO L82 PathProgramCache]: Analyzing trace with hash 779159627, now seen corresponding path program 38 times [2020-07-21 19:47:06,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:47:06,390 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [339038369] [2020-07-21 19:47:06,390 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 19:47:07,225 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:47:07,225 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:47:07,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 1057 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:47:07,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:47:07,470 INFO L134 CoverageAnalysis]: Checked inductivity of 6427 backedges. 246 proven. 934 refuted. 0 times theorem prover too weak. 5247 trivial. 0 not checked. [2020-07-21 19:47:07,471 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:47:10,545 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:10,546 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:11,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:12,036 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:12,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:12,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:12,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:12,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:12,873 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:13,019 INFO L134 CoverageAnalysis]: Checked inductivity of 6427 backedges. 254 proven. 950 refuted. 0 times theorem prover too weak. 5223 trivial. 0 not checked. [2020-07-21 19:47:13,020 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [339038369] [2020-07-21 19:47:13,020 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:47:13,020 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-21 19:47:13,020 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1839254783] [2020-07-21 19:47:13,021 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 19:47:13,021 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:47:13,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 19:47:13,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:47:13,022 INFO L87 Difference]: Start difference. First operand 179 states and 347 transitions. Second operand 19 states. [2020-07-21 19:47:13,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:47:13,803 INFO L93 Difference]: Finished difference Result 334 states and 719 transitions. [2020-07-21 19:47:13,805 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:47:13,805 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 475 [2020-07-21 19:47:13,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:47:13,810 INFO L225 Difference]: With dead ends: 334 [2020-07-21 19:47:13,810 INFO L226 Difference]: Without dead ends: 205 [2020-07-21 19:47:13,813 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 956 GetRequests, 917 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-21 19:47:13,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2020-07-21 19:47:13,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 179. [2020-07-21 19:47:13,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2020-07-21 19:47:13,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 335 transitions. [2020-07-21 19:47:13,829 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 335 transitions. Word has length 475 [2020-07-21 19:47:13,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:47:13,829 INFO L479 AbstractCegarLoop]: Abstraction has 179 states and 335 transitions. [2020-07-21 19:47:13,829 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 19:47:13,830 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 335 transitions. [2020-07-21 19:47:13,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 464 [2020-07-21 19:47:13,835 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:47:13,835 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 27, 27, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 11, 10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:47:14,050 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:47:14,051 INFO L427 AbstractCegarLoop]: === Iteration 56 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:47:14,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:47:14,052 INFO L82 PathProgramCache]: Analyzing trace with hash -2059891070, now seen corresponding path program 39 times [2020-07-21 19:47:14,052 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:47:14,052 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1513418729] [2020-07-21 19:47:14,053 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 19:47:14,885 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:47:14,886 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:47:14,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 1030 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:47:14,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:47:15,125 INFO L134 CoverageAnalysis]: Checked inductivity of 6082 backedges. 288 proven. 861 refuted. 0 times theorem prover too weak. 4933 trivial. 0 not checked. [2020-07-21 19:47:15,125 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:47:18,813 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:18,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:19,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:19,984 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:20,629 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:20,898 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:21,078 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:21,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:21,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:21,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:21,461 INFO L134 CoverageAnalysis]: Checked inductivity of 6082 backedges. 292 proven. 883 refuted. 0 times theorem prover too weak. 4907 trivial. 0 not checked. [2020-07-21 19:47:21,461 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1513418729] [2020-07-21 19:47:21,461 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:47:21,462 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-21 19:47:21,462 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478961833] [2020-07-21 19:47:21,462 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 19:47:21,462 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:47:21,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 19:47:21,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:47:21,463 INFO L87 Difference]: Start difference. First operand 179 states and 335 transitions. Second operand 19 states. [2020-07-21 19:47:21,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:47:21,992 INFO L93 Difference]: Finished difference Result 279 states and 544 transitions. [2020-07-21 19:47:21,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:47:21,993 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 463 [2020-07-21 19:47:21,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:47:21,997 INFO L225 Difference]: With dead ends: 279 [2020-07-21 19:47:21,997 INFO L226 Difference]: Without dead ends: 213 [2020-07-21 19:47:21,998 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 932 GetRequests, 893 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-21 19:47:21,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2020-07-21 19:47:22,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 185. [2020-07-21 19:47:22,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 185 states. [2020-07-21 19:47:22,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 342 transitions. [2020-07-21 19:47:22,012 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 342 transitions. Word has length 463 [2020-07-21 19:47:22,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:47:22,012 INFO L479 AbstractCegarLoop]: Abstraction has 185 states and 342 transitions. [2020-07-21 19:47:22,012 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 19:47:22,012 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 342 transitions. [2020-07-21 19:47:22,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 478 [2020-07-21 19:47:22,015 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:47:22,016 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 33, 33, 30, 26, 18, 18, 18, 18, 18, 18, 18, 16, 16, 16, 16, 16, 16, 16, 14, 8, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:47:22,216 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:47:22,216 INFO L427 AbstractCegarLoop]: === Iteration 57 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:47:22,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:47:22,217 INFO L82 PathProgramCache]: Analyzing trace with hash -1027065263, now seen corresponding path program 40 times [2020-07-21 19:47:22,218 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:47:22,218 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1890450970] [2020-07-21 19:47:22,218 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 19:47:23,085 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:47:23,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:47:23,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 1061 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:47:23,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:47:23,307 INFO L134 CoverageAnalysis]: Checked inductivity of 6484 backedges. 477 proven. 554 refuted. 0 times theorem prover too weak. 5453 trivial. 0 not checked. [2020-07-21 19:47:23,308 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:47:26,558 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:26,559 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:27,072 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:27,073 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:27,446 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:27,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:27,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:27,717 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:27,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:27,862 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:28,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:28,890 INFO L134 CoverageAnalysis]: Checked inductivity of 6484 backedges. 481 proven. 568 refuted. 0 times theorem prover too weak. 5435 trivial. 0 not checked. [2020-07-21 19:47:28,890 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1890450970] [2020-07-21 19:47:28,890 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:47:28,891 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 19:47:28,891 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2081409714] [2020-07-21 19:47:28,891 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:47:28,891 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:47:28,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:47:28,892 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:47:28,892 INFO L87 Difference]: Start difference. First operand 185 states and 342 transitions. Second operand 17 states. [2020-07-21 19:47:29,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:47:29,458 INFO L93 Difference]: Finished difference Result 258 states and 486 transitions. [2020-07-21 19:47:29,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:47:29,461 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 477 [2020-07-21 19:47:29,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:47:29,464 INFO L225 Difference]: With dead ends: 258 [2020-07-21 19:47:29,465 INFO L226 Difference]: Without dead ends: 240 [2020-07-21 19:47:29,466 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 959 GetRequests, 925 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:47:29,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2020-07-21 19:47:29,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 184. [2020-07-21 19:47:29,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2020-07-21 19:47:29,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 339 transitions. [2020-07-21 19:47:29,481 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 339 transitions. Word has length 477 [2020-07-21 19:47:29,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:47:29,481 INFO L479 AbstractCegarLoop]: Abstraction has 184 states and 339 transitions. [2020-07-21 19:47:29,481 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:47:29,482 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 339 transitions. [2020-07-21 19:47:29,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 464 [2020-07-21 19:47:29,486 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:47:29,487 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 28, 26, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 12, 9, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:47:29,700 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:47:29,701 INFO L427 AbstractCegarLoop]: === Iteration 58 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:47:29,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:47:29,702 INFO L82 PathProgramCache]: Analyzing trace with hash 1935160900, now seen corresponding path program 41 times [2020-07-21 19:47:29,702 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:47:29,703 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [41794356] [2020-07-21 19:47:29,703 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 19:47:30,560 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:47:30,560 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:47:30,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 1030 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:47:30,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:47:30,852 INFO L134 CoverageAnalysis]: Checked inductivity of 6083 backedges. 740 proven. 255 refuted. 0 times theorem prover too weak. 5088 trivial. 0 not checked. [2020-07-21 19:47:30,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:47:32,826 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:33,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:33,295 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:33,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:33,679 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:33,680 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:33,741 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:33,783 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:33,815 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:34,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:35,502 INFO L134 CoverageAnalysis]: Checked inductivity of 6083 backedges. 744 proven. 269 refuted. 0 times theorem prover too weak. 5070 trivial. 0 not checked. [2020-07-21 19:47:35,503 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [41794356] [2020-07-21 19:47:35,503 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:47:35,503 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 19:47:35,503 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2103420136] [2020-07-21 19:47:35,504 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:47:35,504 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:47:35,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:47:35,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:47:35,504 INFO L87 Difference]: Start difference. First operand 184 states and 339 transitions. Second operand 17 states. [2020-07-21 19:47:35,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:47:35,997 INFO L93 Difference]: Finished difference Result 234 states and 417 transitions. [2020-07-21 19:47:35,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:47:35,997 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 463 [2020-07-21 19:47:35,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:47:36,000 INFO L225 Difference]: With dead ends: 234 [2020-07-21 19:47:36,000 INFO L226 Difference]: Without dead ends: 219 [2020-07-21 19:47:36,002 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 931 GetRequests, 897 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:47:36,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2020-07-21 19:47:36,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 176. [2020-07-21 19:47:36,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-21 19:47:36,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 315 transitions. [2020-07-21 19:47:36,021 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 315 transitions. Word has length 463 [2020-07-21 19:47:36,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:47:36,022 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 315 transitions. [2020-07-21 19:47:36,022 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:47:36,022 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 315 transitions. [2020-07-21 19:47:36,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 438 [2020-07-21 19:47:36,026 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:47:36,027 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 26, 26, 16, 16, 16, 16, 16, 16, 16, 15, 15, 15, 15, 15, 15, 15, 11, 10, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:47:36,240 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:47:36,241 INFO L427 AbstractCegarLoop]: === Iteration 59 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:47:36,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:47:36,242 INFO L82 PathProgramCache]: Analyzing trace with hash -865784946, now seen corresponding path program 42 times [2020-07-21 19:47:36,242 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:47:36,242 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1576313219] [2020-07-21 19:47:36,243 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 19:47:37,049 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:47:37,049 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:47:37,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 972 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:47:37,057 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:47:37,305 INFO L134 CoverageAnalysis]: Checked inductivity of 5394 backedges. 663 proven. 116 refuted. 0 times theorem prover too weak. 4615 trivial. 0 not checked. [2020-07-21 19:47:37,305 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:47:38,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:38,968 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:39,251 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:39,252 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:39,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:39,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:39,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:39,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:40,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:41,717 INFO L134 CoverageAnalysis]: Checked inductivity of 5394 backedges. 667 proven. 122 refuted. 0 times theorem prover too weak. 4605 trivial. 0 not checked. [2020-07-21 19:47:41,718 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1576313219] [2020-07-21 19:47:41,718 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:47:41,718 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 19:47:41,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424234146] [2020-07-21 19:47:41,719 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 19:47:41,719 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:47:41,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 19:47:41,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:47:41,719 INFO L87 Difference]: Start difference. First operand 176 states and 315 transitions. Second operand 15 states. [2020-07-21 19:47:42,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:47:42,119 INFO L93 Difference]: Finished difference Result 249 states and 537 transitions. [2020-07-21 19:47:42,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:47:42,121 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 437 [2020-07-21 19:47:42,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:47:42,126 INFO L225 Difference]: With dead ends: 249 [2020-07-21 19:47:42,126 INFO L226 Difference]: Without dead ends: 236 [2020-07-21 19:47:42,127 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 878 GetRequests, 849 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 19:47:42,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 236 states. [2020-07-21 19:47:42,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 236 to 196. [2020-07-21 19:47:42,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2020-07-21 19:47:42,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 386 transitions. [2020-07-21 19:47:42,147 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 386 transitions. Word has length 437 [2020-07-21 19:47:42,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:47:42,148 INFO L479 AbstractCegarLoop]: Abstraction has 196 states and 386 transitions. [2020-07-21 19:47:42,148 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 19:47:42,148 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 386 transitions. [2020-07-21 19:47:42,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2020-07-21 19:47:42,152 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:47:42,152 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 33, 33, 27, 27, 19, 19, 19, 19, 19, 19, 19, 16, 16, 16, 16, 16, 16, 16, 11, 11, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:47:42,365 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 60 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:47:42,366 INFO L427 AbstractCegarLoop]: === Iteration 60 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:47:42,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:47:42,367 INFO L82 PathProgramCache]: Analyzing trace with hash 1728546952, now seen corresponding path program 43 times [2020-07-21 19:47:42,367 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:47:42,367 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1836463884] [2020-07-21 19:47:42,368 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 19:47:43,179 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:47:43,179 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:47:43,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 1084 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:47:43,186 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:47:43,397 INFO L134 CoverageAnalysis]: Checked inductivity of 6790 backedges. 854 proven. 181 refuted. 0 times theorem prover too weak. 5755 trivial. 0 not checked. [2020-07-21 19:47:43,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:47:45,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:46,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:46,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:46,834 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:47,015 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:47,201 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:47,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:47:49,572 INFO L134 CoverageAnalysis]: Checked inductivity of 6790 backedges. 860 proven. 189 refuted. 0 times theorem prover too weak. 5741 trivial. 0 not checked. [2020-07-21 19:47:49,573 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1836463884] [2020-07-21 19:47:49,573 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:47:49,573 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 19:47:49,573 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908383778] [2020-07-21 19:47:49,574 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:47:49,574 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:47:49,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:47:49,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:47:49,574 INFO L87 Difference]: Start difference. First operand 196 states and 386 transitions. Second operand 17 states. [2020-07-21 19:47:50,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:47:50,208 INFO L93 Difference]: Finished difference Result 227 states and 441 transitions. [2020-07-21 19:47:50,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:47:50,211 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 487 [2020-07-21 19:47:50,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:47:50,215 INFO L225 Difference]: With dead ends: 227 [2020-07-21 19:47:50,215 INFO L226 Difference]: Without dead ends: 214 [2020-07-21 19:47:50,217 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 979 GetRequests, 945 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:47:50,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2020-07-21 19:47:50,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 173. [2020-07-21 19:47:50,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-21 19:47:50,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 295 transitions. [2020-07-21 19:47:50,230 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 295 transitions. Word has length 487 [2020-07-21 19:47:50,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:47:50,231 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 295 transitions. [2020-07-21 19:47:50,231 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:47:50,231 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 295 transitions. [2020-07-21 19:47:50,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 464 [2020-07-21 19:47:50,234 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:47:50,234 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 33, 27, 27, 17, 17, 17, 17, 17, 17, 17, 16, 16, 16, 16, 16, 16, 16, 11, 10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:47:50,435 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:47:50,435 INFO L427 AbstractCegarLoop]: === Iteration 61 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:47:50,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:47:50,436 INFO L82 PathProgramCache]: Analyzing trace with hash 1326629730, now seen corresponding path program 44 times [2020-07-21 19:47:50,437 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:47:50,437 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [882688250] [2020-07-21 19:47:50,437 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 19:47:51,272 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:47:51,272 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 19:47:51,272 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 19:47:51,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 19:47:51,356 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 19:47:51,427 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 19:47:51,427 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 19:47:51,641 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:47:51,766 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 07:47:51 BoogieIcfgContainer [2020-07-21 19:47:51,766 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 19:47:51,768 INFO L168 Benchmark]: Toolchain (without parser) took 279822.21 ms. Allocated memory was 137.4 MB in the beginning and 1.7 GB in the end (delta: 1.6 GB). Free memory was 102.7 MB in the beginning and 729.2 MB in the end (delta: -626.5 MB). Peak memory consumption was 955.3 MB. Max. memory is 7.1 GB. [2020-07-21 19:47:51,769 INFO L168 Benchmark]: CDTParser took 0.37 ms. Allocated memory is still 137.4 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-07-21 19:47:51,769 INFO L168 Benchmark]: CACSL2BoogieTranslator took 321.24 ms. Allocated memory is still 137.4 MB. Free memory was 102.3 MB in the beginning and 92.9 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-07-21 19:47:51,769 INFO L168 Benchmark]: Boogie Preprocessor took 37.92 ms. Allocated memory is still 137.4 MB. Free memory was 92.7 MB in the beginning and 91.3 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-07-21 19:47:51,770 INFO L168 Benchmark]: RCFGBuilder took 403.60 ms. Allocated memory was 137.4 MB in the beginning and 198.2 MB in the end (delta: 60.8 MB). Free memory was 91.3 MB in the beginning and 165.2 MB in the end (delta: -73.9 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. [2020-07-21 19:47:51,770 INFO L168 Benchmark]: TraceAbstraction took 279051.43 ms. Allocated memory was 198.2 MB in the beginning and 1.7 GB in the end (delta: 1.5 GB). Free memory was 164.5 MB in the beginning and 729.2 MB in the end (delta: -564.7 MB). Peak memory consumption was 956.3 MB. Max. memory is 7.1 GB. [2020-07-21 19:47:51,772 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.37 ms. Allocated memory is still 137.4 MB. Free memory was 120.4 MB in the beginning and 120.2 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 321.24 ms. Allocated memory is still 137.4 MB. Free memory was 102.3 MB in the beginning and 92.9 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 37.92 ms. Allocated memory is still 137.4 MB. Free memory was 92.7 MB in the beginning and 91.3 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 403.60 ms. Allocated memory was 137.4 MB in the beginning and 198.2 MB in the end (delta: 60.8 MB). Free memory was 91.3 MB in the beginning and 165.2 MB in the end (delta: -73.9 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. * TraceAbstraction took 279051.43 ms. Allocated memory was 198.2 MB in the beginning and 1.7 GB in the end (delta: 1.5 GB). Free memory was 164.5 MB in the beginning and 729.2 MB in the end (delta: -564.7 MB). Peak memory consumption was 956.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 8; VAL [x=8] [L37] CALL, EXPR fibo1(x) VAL [\old(n)=8] [L8] COND FALSE !(n < 1) VAL [\old(n)=8, n=8] [L10] COND FALSE !(n == 1) VAL [\old(n)=8, n=8] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=7] [L18] COND FALSE !(n < 1) VAL [\old(n)=7, n=7] [L20] COND FALSE !(n == 1) VAL [\old(n)=7, n=7] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=6] [L8] COND FALSE !(n < 1) VAL [\old(n)=6, n=6] [L10] COND FALSE !(n == 1) VAL [\old(n)=6, n=6] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=5] [L18] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L20] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=4] [L8] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L10] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=4, fibo2(n-1)=2, n=4] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=4, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=5, fibo1(n-1)=3, n=5] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=5, fibo1(n-1)=3, fibo1(n-2)=2, n=5] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=6, fibo2(n-1)=5, n=6] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=4] [L18] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L20] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=4, fibo1(n-1)=2, n=4] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=4, fibo1(n-1)=2, fibo1(n-2)=1, n=4] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=6, fibo2(n-1)=5, fibo2(n-2)=3, n=6] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=7, fibo1(n-1)=8, n=7] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=5] [L8] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L10] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=4] [L18] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L20] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=4, fibo1(n-1)=2, n=4] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=4, fibo1(n-1)=2, fibo1(n-2)=1, n=4] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=5, fibo2(n-1)=3, n=5] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=5, fibo2(n-1)=3, fibo2(n-2)=2, n=5] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=7, fibo1(n-1)=8, fibo1(n-2)=5, n=7] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=8, fibo2(n-1)=13, n=8] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=6] [L18] COND FALSE !(n < 1) VAL [\old(n)=6, n=6] [L20] COND FALSE !(n == 1) VAL [\old(n)=6, n=6] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=5] [L8] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L10] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=4] [L18] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L20] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=4, fibo1(n-1)=2, n=4] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=4, fibo1(n-1)=2, fibo1(n-2)=1, n=4] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=5, fibo2(n-1)=3, n=5] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=5, fibo2(n-1)=3, fibo2(n-2)=2, n=5] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=6, fibo1(n-1)=5, n=6] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=4] [L8] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L10] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=4, fibo2(n-1)=2, n=4] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=4, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=6, fibo1(n-1)=5, fibo1(n-2)=3, n=6] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=8, fibo2(n-1)=13, fibo2(n-2)=8, n=8] [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) VAL [fibo1(x)=21, x=8] [L37] int result = fibo1(x); [L38] COND TRUE result == 21 VAL [result=21, x=8] [L39] __VERIFIER_error() VAL [result=21, x=8] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 278.7s, OverallIterations: 61, TraceHistogramMax: 45, AutomataDifference: 25.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1650 SDtfs, 3074 SDslu, 11551 SDs, 0 SdLazy, 12439 SolverSat, 3266 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 10.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 43249 GetRequests, 41269 SyntacticMatches, 742 SemanticMatches, 1238 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5738 ImplicationChecksByTransitivity, 24.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=197occurred in iteration=42, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 1.0s AutomataMinimizationTime, 60 MinimizatonAttempts, 2423 StatesRemovedByMinimization, 57 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 1.2s SsaConstructionTime, 5.6s SatisfiabilityAnalysisTime, 210.4s InterpolantComputationTime, 21943 NumberOfCodeBlocks, 21904 NumberOfCodeBlocksAsserted, 118 NumberOfCheckSat, 42815 ConstructedInterpolants, 0 QuantifiedInterpolants, 24369025 SizeOfPredicates, 410 NumberOfNonLiveVariables, 47772 ConjunctsInSsa, 820 ConjunctsInUnsatCore, 118 InterpolantComputations, 2 PerfectInterpolantSequences, 476412/527676 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...