/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 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_25-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 21:22:41,978 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 21:22:41,982 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 21:22:42,014 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 21:22:42,015 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 21:22:42,018 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 21:22:42,023 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 21:22:42,035 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 21:22:42,042 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 21:22:42,049 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 21:22:42,054 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 21:22:42,056 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 21:22:42,056 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 21:22:42,060 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 21:22:42,065 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 21:22:42,067 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 21:22:42,071 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 21:22:42,074 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 21:22:42,076 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 21:22:42,086 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 21:22:42,095 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 21:22:42,101 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 21:22:42,104 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 21:22:42,104 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 21:22:42,108 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 21:22:42,128 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 21:22:42,129 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 21:22:42,131 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 21:22:42,132 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 21:22:42,167 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 21:22:42,168 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 21:22:42,172 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 21:22:42,172 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 21:22:42,172 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 21:22:42,173 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 21:22:42,173 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 21:22:42,173 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 21:22:42,174 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 21:22:42,174 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 21:22:42,176 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 21:22:42,176 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 21:22:42,177 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 21:22:42,177 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 21:22:42,178 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 21:22:42,178 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 21:22:42,178 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 21:22:42,178 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 21:22:42,179 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 21:22:42,179 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 21:22:42,179 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 21:22:42,179 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:22:42,179 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 21:22:42,180 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 21:22:42,181 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 21:22:42,181 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 21:22:42,181 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:42,181 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 21:22:42,181 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 21:22:42,182 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 -> 4 [2020-07-20 21:22:42,688 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 21:22:42,708 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 21:22:42,714 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 21:22:42,716 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 21:22:42,716 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 21:22:42,717 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_25-1.c [2020-07-20 21:22:42,820 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a46b49855/1931e9b0d3f449a9a60e2d5fd0e89585/FLAG30a8f4e28 [2020-07-20 21:22:43,595 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 21:22:43,596 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_25-1.c [2020-07-20 21:22:43,606 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a46b49855/1931e9b0d3f449a9a60e2d5fd0e89585/FLAG30a8f4e28 [2020-07-20 21:22:43,858 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a46b49855/1931e9b0d3f449a9a60e2d5fd0e89585 [2020-07-20 21:22:43,876 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 21:22:43,880 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 21:22:43,882 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 21:22:43,883 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 21:22:43,889 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 21:22:43,890 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:22:43" (1/1) ... [2020-07-20 21:22:43,896 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3c291f74 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:43, skipping insertion in model container [2020-07-20 21:22:43,897 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:22:43" (1/1) ... [2020-07-20 21:22:43,910 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 21:22:43,938 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 21:22:44,161 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:22:44,171 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 21:22:44,196 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:22:44,222 INFO L208 MainTranslator]: Completed translation [2020-07-20 21:22:44,223 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:44 WrapperNode [2020-07-20 21:22:44,224 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 21:22:44,226 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 21:22:44,226 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 21:22:44,226 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 21:22:44,250 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:44" (1/1) ... [2020-07-20 21:22:44,251 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:44" (1/1) ... [2020-07-20 21:22:44,261 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:44" (1/1) ... [2020-07-20 21:22:44,262 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:44" (1/1) ... [2020-07-20 21:22:44,277 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:44" (1/1) ... [2020-07-20 21:22:44,281 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:44" (1/1) ... [2020-07-20 21:22:44,285 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:44" (1/1) ... [2020-07-20 21:22:44,288 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 21:22:44,292 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 21:22:44,292 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 21:22:44,293 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 21:22:44,295 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:44" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:22:44,574 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 21:22:44,575 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 21:22:44,575 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-20 21:22:44,575 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 21:22:44,576 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 21:22:44,576 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 21:22:44,577 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-20 21:22:44,577 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 21:22:44,577 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 21:22:44,577 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 21:22:44,863 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 21:22:44,864 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 21:22:44,871 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:22:44 BoogieIcfgContainer [2020-07-20 21:22:44,872 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 21:22:44,873 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 21:22:44,874 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 21:22:44,880 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 21:22:44,881 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 09:22:43" (1/3) ... [2020-07-20 21:22:44,883 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b40a60b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:22:44, skipping insertion in model container [2020-07-20 21:22:44,883 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:44" (2/3) ... [2020-07-20 21:22:44,884 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b40a60b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:22:44, skipping insertion in model container [2020-07-20 21:22:44,884 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:22:44" (3/3) ... [2020-07-20 21:22:44,887 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_25-1.c [2020-07-20 21:22:44,908 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 21:22:44,924 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 21:22:44,952 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 21:22:45,021 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 21:22:45,022 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 21:22:45,023 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 21:22:45,024 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 21:22:45,024 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 21:22:45,024 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 21:22:45,025 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 21:22:45,025 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 21:22:45,075 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-20 21:22:45,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 21:22:45,093 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:45,095 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:45,096 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:45,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:45,110 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-20 21:22:45,127 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:45,128 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [727457709] [2020-07-20 21:22:45,129 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:45,239 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:22:45,240 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:45,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 24 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:22:45,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:45,401 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:22:45,401 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:22:45,403 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [727457709] [2020-07-20 21:22:45,403 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:22:45,404 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:22:45,406 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173244715] [2020-07-20 21:22:45,413 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:22:45,414 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:45,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:22:45,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:22:45,437 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-20 21:22:45,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:45,589 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 21:22:45,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:22:45,593 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 21:22:45,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:45,609 INFO L225 Difference]: With dead ends: 35 [2020-07-20 21:22:45,610 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 21:22:45,616 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 [2020-07-20 21:22:45,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 21:22:45,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 21:22:45,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 21:22:45,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 21:22:45,687 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-20 21:22:45,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:45,688 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 21:22:45,688 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:22:45,688 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 21:22:45,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 21:22:45,692 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:45,692 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:45,907 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:45,908 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:45,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:45,910 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-20 21:22:45,911 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:45,911 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1264293650] [2020-07-20 21:22:45,912 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:45,942 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:22:45,942 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:45,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:22:45,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:46,006 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:22:46,007 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:22:46,007 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1264293650] [2020-07-20 21:22:46,008 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:22:46,008 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:22:46,008 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707679429] [2020-07-20 21:22:46,014 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:22:46,014 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:46,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:22:46,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:22:46,015 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-20 21:22:46,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:46,158 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-20 21:22:46,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:22:46,159 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 21:22:46,161 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:46,165 INFO L225 Difference]: With dead ends: 27 [2020-07-20 21:22:46,165 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 21:22:46,168 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 [2020-07-20 21:22:46,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 21:22:46,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-20 21:22:46,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 21:22:46,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 21:22:46,200 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-20 21:22:46,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:46,201 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 21:22:46,201 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:22:46,202 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 21:22:46,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 21:22:46,210 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:46,210 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:46,426 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:46,428 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:46,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:46,430 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-20 21:22:46,431 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:46,431 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1104072012] [2020-07-20 21:22:46,432 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:46,470 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:22:46,471 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:46,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:22:46,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:46,560 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 21:22:46,561 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:46,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:46,951 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 21:22:46,953 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1104072012] [2020-07-20 21:22:46,953 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:46,954 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 21:22:46,954 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517527109] [2020-07-20 21:22:46,955 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 21:22:46,956 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:46,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 21:22:46,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 21:22:46,958 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-20 21:22:47,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:47,160 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-20 21:22:47,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 21:22:47,161 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-20 21:22:47,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:47,164 INFO L225 Difference]: With dead ends: 32 [2020-07-20 21:22:47,164 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 21:22:47,165 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:22:47,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 21:22:47,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-20 21:22:47,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 21:22:47,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 21:22:47,178 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-20 21:22:47,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:47,179 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 21:22:47,179 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 21:22:47,180 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 21:22:47,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 21:22:47,186 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:47,187 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:47,402 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:47,404 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:47,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:47,405 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-20 21:22:47,405 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:47,406 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1732348909] [2020-07-20 21:22:47,406 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:47,451 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:22:47,452 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:47,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:22:47,457 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:47,519 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 21:22:47,520 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:47,730 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:47,778 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 21:22:47,779 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1732348909] [2020-07-20 21:22:47,780 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:47,780 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 21:22:47,780 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44650081] [2020-07-20 21:22:47,781 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 21:22:47,782 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:47,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 21:22:47,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 21:22:47,783 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-20 21:22:47,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:47,916 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-20 21:22:47,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 21:22:47,917 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 21:22:47,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:47,920 INFO L225 Difference]: With dead ends: 37 [2020-07-20 21:22:47,921 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 21:22:47,922 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:22:47,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 21:22:47,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-20 21:22:47,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 21:22:47,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 21:22:47,934 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-20 21:22:47,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:47,934 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 21:22:47,935 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 21:22:47,935 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 21:22:47,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 21:22:47,937 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:47,937 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:48,151 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:48,153 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:48,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:48,155 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-20 21:22:48,155 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:48,156 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [993314867] [2020-07-20 21:22:48,156 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:48,233 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:48,234 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:48,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:22:48,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:48,384 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 21:22:48,385 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:48,723 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:48,725 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:48,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:48,795 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:48,838 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 21:22:48,839 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [993314867] [2020-07-20 21:22:48,839 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:48,839 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 21:22:48,840 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510010074] [2020-07-20 21:22:48,840 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 21:22:48,841 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:48,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 21:22:48,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:22:48,842 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-20 21:22:49,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:49,107 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-20 21:22:49,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 21:22:49,108 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-20 21:22:49,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:49,111 INFO L225 Difference]: With dead ends: 42 [2020-07-20 21:22:49,111 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 21:22:49,112 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:22:49,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 21:22:49,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-20 21:22:49,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 21:22:49,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 21:22:49,127 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-20 21:22:49,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:49,128 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 21:22:49,128 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 21:22:49,128 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 21:22:49,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 21:22:49,131 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:49,131 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:49,344 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:49,345 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:49,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:49,346 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-20 21:22:49,347 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:49,347 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1428694992] [2020-07-20 21:22:49,347 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:49,390 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:49,391 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:49,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:22:49,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:49,457 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-20 21:22:49,457 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:49,804 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:49,871 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:49,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:49,932 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 21:22:49,933 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1428694992] [2020-07-20 21:22:49,933 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:49,934 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 21:22:49,934 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [991562247] [2020-07-20 21:22:49,935 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 21:22:49,936 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:49,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 21:22:49,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:22:49,937 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-20 21:22:50,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:50,150 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-20 21:22:50,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 21:22:50,151 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 21:22:50,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:50,154 INFO L225 Difference]: With dead ends: 47 [2020-07-20 21:22:50,155 INFO L226 Difference]: Without dead ends: 43 [2020-07-20 21:22:50,156 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-20 21:22:50,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-20 21:22:50,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-20 21:22:50,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 21:22:50,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 21:22:50,172 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-20 21:22:50,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:50,173 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 21:22:50,173 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 21:22:50,173 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 21:22:50,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-20 21:22:50,176 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:50,177 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:50,382 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:50,383 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:50,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:50,384 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-20 21:22:50,385 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:50,385 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1297227509] [2020-07-20 21:22:50,386 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:50,439 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:50,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:50,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:22:50,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:50,515 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-20 21:22:50,516 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:51,062 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:51,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:51,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:51,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:51,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:51,340 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-20 21:22:51,341 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1297227509] [2020-07-20 21:22:51,341 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:51,342 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 21:22:51,342 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1959505331] [2020-07-20 21:22:51,343 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:22:51,344 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:51,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:22:51,345 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:22:51,345 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-20 21:22:51,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:51,627 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-20 21:22:51,628 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:22:51,629 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-20 21:22:51,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:51,634 INFO L225 Difference]: With dead ends: 52 [2020-07-20 21:22:51,634 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 21:22:51,636 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:22:51,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 21:22:51,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-20 21:22:51,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 21:22:51,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 21:22:51,655 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-20 21:22:51,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:51,656 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 21:22:51,656 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:22:51,656 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 21:22:51,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-20 21:22:51,659 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:51,660 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:51,874 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:51,875 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:51,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:51,876 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-20 21:22:51,876 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:51,877 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [665368239] [2020-07-20 21:22:51,878 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:51,966 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:51,967 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:51,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:22:51,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:52,059 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-20 21:22:52,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:52,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:52,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:52,800 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:52,859 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:52,913 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-20 21:22:52,914 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [665368239] [2020-07-20 21:22:52,915 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:52,915 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 21:22:52,915 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553467944] [2020-07-20 21:22:52,916 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:22:52,917 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:52,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:22:52,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:22:52,918 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-20 21:22:53,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:53,132 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-20 21:22:53,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:22:53,135 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-20 21:22:53,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:53,139 INFO L225 Difference]: With dead ends: 57 [2020-07-20 21:22:53,140 INFO L226 Difference]: Without dead ends: 53 [2020-07-20 21:22:53,142 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:22:53,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-20 21:22:53,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-20 21:22:53,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 21:22:53,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 21:22:53,162 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-20 21:22:53,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:53,163 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 21:22:53,163 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:22:53,163 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 21:22:53,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 21:22:53,166 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:53,167 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:53,382 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:53,383 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:53,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:53,384 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-20 21:22:53,384 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:53,385 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [527064103] [2020-07-20 21:22:53,385 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:53,468 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:53,469 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:53,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:22:53,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:53,612 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-20 21:22:53,612 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:54,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:54,380 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:54,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:54,709 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:54,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:54,845 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-20 21:22:54,846 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [527064103] [2020-07-20 21:22:54,846 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:54,846 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 21:22:54,847 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400195864] [2020-07-20 21:22:54,848 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:22:54,848 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:54,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:22:54,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:22:54,849 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-20 21:22:55,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:55,281 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-20 21:22:55,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:22:55,282 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-20 21:22:55,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:55,286 INFO L225 Difference]: With dead ends: 62 [2020-07-20 21:22:55,286 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 21:22:55,288 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:22:55,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 21:22:55,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-20 21:22:55,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 21:22:55,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 21:22:55,306 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-20 21:22:55,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:55,307 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 21:22:55,307 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:22:55,307 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 21:22:55,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-20 21:22:55,312 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:55,312 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:55,526 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:55,528 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:55,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:55,529 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-20 21:22:55,530 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:55,530 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [670837307] [2020-07-20 21:22:55,530 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:55,642 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:55,643 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:55,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 360 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:22:55,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:55,788 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-20 21:22:55,789 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:56,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:56,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:57,092 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:57,094 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:57,160 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:57,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:57,249 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-20 21:22:57,250 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [670837307] [2020-07-20 21:22:57,251 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:57,251 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 21:22:57,251 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [646620224] [2020-07-20 21:22:57,254 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:22:57,255 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:57,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:22:57,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:22:57,256 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-20 21:22:57,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:57,568 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-20 21:22:57,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:22:57,569 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-20 21:22:57,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:57,575 INFO L225 Difference]: With dead ends: 67 [2020-07-20 21:22:57,576 INFO L226 Difference]: Without dead ends: 63 [2020-07-20 21:22:57,583 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:22:57,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-20 21:22:57,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-20 21:22:57,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 21:22:57,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 21:22:57,639 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-20 21:22:57,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:57,640 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 21:22:57,640 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:22:57,643 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 21:22:57,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-20 21:22:57,652 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:57,653 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:57,853 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:57,854 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:57,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:57,855 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-20 21:22:57,856 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:57,856 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [760455925] [2020-07-20 21:22:57,857 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:58,041 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:58,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:58,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 544 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 21:22:58,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:58,221 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-20 21:22:58,222 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:59,717 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:00,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:00,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:00,448 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:00,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:00,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:00,673 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-20 21:23:00,674 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [760455925] [2020-07-20 21:23:00,675 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:00,675 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 21:23:00,676 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823828171] [2020-07-20 21:23:00,677 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 21:23:00,678 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:00,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 21:23:00,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:23:00,679 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-20 21:23:01,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:01,022 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-20 21:23:01,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:23:01,024 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-20 21:23:01,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:01,030 INFO L225 Difference]: With dead ends: 72 [2020-07-20 21:23:01,031 INFO L226 Difference]: Without dead ends: 68 [2020-07-20 21:23:01,032 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:23:01,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-20 21:23:01,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-20 21:23:01,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 21:23:01,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 21:23:01,086 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-20 21:23:01,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:01,090 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 21:23:01,091 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 21:23:01,091 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 21:23:01,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-20 21:23:01,100 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:01,100 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 34, 21, 21, 21, 21, 21, 21, 21, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:01,314 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:01,315 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:01,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:01,316 INFO L82 PathProgramCache]: Analyzing trace with hash 1006419304, now seen corresponding path program 5 times [2020-07-20 21:23:01,316 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:01,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1730063807] [2020-07-20 21:23:01,317 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:01,467 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:01,467 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:01,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 562 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 21:23:01,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:01,672 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1055 refuted. 0 times theorem prover too weak. 3799 trivial. 0 not checked. [2020-07-20 21:23:01,673 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:03,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:03,928 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:04,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:04,231 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:04,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:04,296 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:04,392 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1095 refuted. 0 times theorem prover too weak. 3759 trivial. 0 not checked. [2020-07-20 21:23:04,393 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1730063807] [2020-07-20 21:23:04,393 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:04,393 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 21:23:04,393 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1771974893] [2020-07-20 21:23:04,394 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 21:23:04,394 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:04,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 21:23:04,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:23:04,395 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-20 21:23:04,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:04,685 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-20 21:23:04,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:23:04,686 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 299 [2020-07-20 21:23:04,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:04,691 INFO L225 Difference]: With dead ends: 77 [2020-07-20 21:23:04,691 INFO L226 Difference]: Without dead ends: 73 [2020-07-20 21:23:04,693 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 603 GetRequests, 570 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:23:04,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-20 21:23:04,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-20 21:23:04,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 21:23:04,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 21:23:04,707 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 299 [2020-07-20 21:23:04,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:04,708 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 21:23:04,708 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 21:23:04,708 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 21:23:04,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-20 21:23:04,722 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:04,722 INFO L422 BasicCegarLoop]: trace histogram [77, 77, 39, 38, 38, 38, 38, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:04,936 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:04,936 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:04,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:04,937 INFO L82 PathProgramCache]: Analyzing trace with hash 785285043, now seen corresponding path program 6 times [2020-07-20 21:23:04,937 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:04,938 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1029537736] [2020-07-20 21:23:04,938 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:05,197 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:05,198 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:05,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 959 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 21:23:05,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:05,498 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2126 refuted. 0 times theorem prover too weak. 12702 trivial. 0 not checked. [2020-07-20 21:23:05,499 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:07,926 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:08,587 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:09,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:09,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:09,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:09,380 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:09,441 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:09,443 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:09,718 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2177 refuted. 0 times theorem prover too weak. 12651 trivial. 0 not checked. [2020-07-20 21:23:09,719 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1029537736] [2020-07-20 21:23:09,719 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:09,720 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 21:23:09,720 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166459394] [2020-07-20 21:23:09,722 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 21:23:09,722 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:09,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 21:23:09,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:23:09,724 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-20 21:23:10,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:10,320 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-20 21:23:10,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:23:10,321 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 507 [2020-07-20 21:23:10,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:10,327 INFO L225 Difference]: With dead ends: 82 [2020-07-20 21:23:10,327 INFO L226 Difference]: Without dead ends: 78 [2020-07-20 21:23:10,329 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 983 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 21:23:10,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-20 21:23:10,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-20 21:23:10,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 21:23:10,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 21:23:10,347 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 507 [2020-07-20 21:23:10,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:10,349 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 21:23:10,349 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 21:23:10,349 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 21:23:10,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-20 21:23:10,354 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:10,354 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:10,567 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:10,569 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:10,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:10,570 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-20 21:23:10,570 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:10,570 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [113092018] [2020-07-20 21:23:10,571 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:10,822 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:10,823 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:10,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 845 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 21:23:10,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:11,185 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-20 21:23:11,186 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:13,408 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:14,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:14,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:14,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:14,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:14,680 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:14,791 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:14,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:14,853 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:15,057 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-20 21:23:15,058 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [113092018] [2020-07-20 21:23:15,059 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:15,059 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 21:23:15,060 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1642625802] [2020-07-20 21:23:15,061 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 21:23:15,061 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:15,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 21:23:15,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:23:15,062 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-20 21:23:15,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:15,437 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-20 21:23:15,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:23:15,439 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-20 21:23:15,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:15,446 INFO L225 Difference]: With dead ends: 87 [2020-07-20 21:23:15,446 INFO L226 Difference]: Without dead ends: 83 [2020-07-20 21:23:15,449 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 21:23:15,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-20 21:23:15,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-20 21:23:15,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 21:23:15,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 21:23:15,481 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-20 21:23:15,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:15,482 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 21:23:15,482 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 21:23:15,483 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 21:23:15,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1067 [2020-07-20 21:23:15,501 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:15,502 INFO L422 BasicCegarLoop]: trace histogram [163, 163, 82, 81, 81, 81, 81, 81, 81, 81, 81, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:15,717 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:15,717 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:15,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:15,718 INFO L82 PathProgramCache]: Analyzing trace with hash 40336450, now seen corresponding path program 7 times [2020-07-20 21:23:15,718 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:15,719 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2017514663] [2020-07-20 21:23:15,719 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:16,359 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:16,360 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:16,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 2014 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:23:16,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:17,063 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5632 refuted. 0 times theorem prover too weak. 62583 trivial. 0 not checked. [2020-07-20 21:23:17,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:21,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:21,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:23,301 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:23,947 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:23,948 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:24,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:24,360 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:24,559 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:24,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:24,696 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:24,698 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:24,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:25,526 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5702 refuted. 0 times theorem prover too weak. 62513 trivial. 0 not checked. [2020-07-20 21:23:25,528 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2017514663] [2020-07-20 21:23:25,528 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:25,529 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 21:23:25,529 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1695207186] [2020-07-20 21:23:25,531 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:23:25,532 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:25,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:23:25,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:23:25,533 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-20 21:23:26,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:26,616 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-20 21:23:26,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 21:23:26,618 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1066 [2020-07-20 21:23:26,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:26,625 INFO L225 Difference]: With dead ends: 92 [2020-07-20 21:23:26,626 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 21:23:26,628 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2140 GetRequests, 2097 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:23:26,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 21:23:26,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-20 21:23:26,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 21:23:26,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 21:23:26,657 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1066 [2020-07-20 21:23:26,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:26,659 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 21:23:26,659 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:23:26,660 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 21:23:26,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 651 [2020-07-20 21:23:26,669 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:26,669 INFO L422 BasicCegarLoop]: trace histogram [95, 95, 73, 47, 47, 47, 47, 47, 47, 47, 26, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:26,882 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:26,883 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:26,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:26,884 INFO L82 PathProgramCache]: Analyzing trace with hash -12450132, now seen corresponding path program 7 times [2020-07-20 21:23:26,884 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:26,885 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [261899874] [2020-07-20 21:23:26,885 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:27,306 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:27,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:27,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 1220 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:23:27,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:27,781 INFO L134 CoverageAnalysis]: Checked inductivity of 24812 backedges. 501 proven. 3346 refuted. 0 times theorem prover too weak. 20965 trivial. 0 not checked. [2020-07-20 21:23:27,782 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:31,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:31,187 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:32,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:33,043 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:33,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:33,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:33,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:33,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:33,822 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:33,916 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:34,584 INFO L134 CoverageAnalysis]: Checked inductivity of 24812 backedges. 501 proven. 3423 refuted. 0 times theorem prover too weak. 20888 trivial. 0 not checked. [2020-07-20 21:23:34,593 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [261899874] [2020-07-20 21:23:34,595 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:34,596 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 21:23:34,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [832973685] [2020-07-20 21:23:34,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:23:34,599 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:34,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:23:34,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:23:34,600 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-20 21:23:35,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:35,479 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-20 21:23:35,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 21:23:35,481 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 650 [2020-07-20 21:23:35,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:35,490 INFO L225 Difference]: With dead ends: 97 [2020-07-20 21:23:35,491 INFO L226 Difference]: Without dead ends: 93 [2020-07-20 21:23:35,493 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1307 GetRequests, 1264 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:23:35,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-20 21:23:35,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-20 21:23:35,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 21:23:35,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 21:23:35,529 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 650 [2020-07-20 21:23:35,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:35,531 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 21:23:35,531 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:23:35,531 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 21:23:35,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1496 [2020-07-20 21:23:35,569 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:35,570 INFO L422 BasicCegarLoop]: trace histogram [229, 229, 115, 114, 114, 114, 114, 114, 114, 114, 114, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:35,784 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:35,785 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:35,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:35,786 INFO L82 PathProgramCache]: Analyzing trace with hash -1187543541, now seen corresponding path program 8 times [2020-07-20 21:23:35,788 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:35,788 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1968067263] [2020-07-20 21:23:35,789 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:36,511 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:36,512 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:36,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 2821 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:23:36,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:37,964 INFO L134 CoverageAnalysis]: Checked inductivity of 136629 backedges. 1386 proven. 8950 refuted. 0 times theorem prover too weak. 126293 trivial. 0 not checked. [2020-07-20 21:23:37,965 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:44,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:47,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:48,440 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:49,189 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:49,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:49,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:49,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:49,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:50,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:50,059 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:50,129 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:50,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:51,355 INFO L134 CoverageAnalysis]: Checked inductivity of 136629 backedges. 1386 proven. 9042 refuted. 0 times theorem prover too weak. 126201 trivial. 0 not checked. [2020-07-20 21:23:51,356 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1968067263] [2020-07-20 21:23:51,357 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:51,358 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 21:23:51,358 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723018876] [2020-07-20 21:23:51,360 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:23:51,361 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:51,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:23:51,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:23:51,363 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-20 21:23:52,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:52,365 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-20 21:23:52,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:23:52,367 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1495 [2020-07-20 21:23:52,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:52,377 INFO L225 Difference]: With dead ends: 102 [2020-07-20 21:23:52,378 INFO L226 Difference]: Without dead ends: 98 [2020-07-20 21:23:52,380 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2999 GetRequests, 2951 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:23:52,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-20 21:23:52,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-20 21:23:52,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 21:23:52,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 21:23:52,408 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1495 [2020-07-20 21:23:52,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:52,412 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 21:23:52,412 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:23:52,412 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 21:23:52,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1843 [2020-07-20 21:23:52,509 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:52,510 INFO L422 BasicCegarLoop]: trace histogram [269, 269, 221, 134, 134, 134, 134, 134, 134, 134, 87, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:52,726 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:52,727 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:52,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:52,729 INFO L82 PathProgramCache]: Analyzing trace with hash -323852785, now seen corresponding path program 8 times [2020-07-20 21:23:52,730 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:52,730 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2068453395] [2020-07-20 21:23:52,731 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:53,655 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:53,656 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:53,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 3443 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:23:53,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:55,604 INFO L134 CoverageAnalysis]: Checked inductivity of 204138 backedges. 1703 proven. 11413 refuted. 0 times theorem prover too weak. 191022 trivial. 0 not checked. [2020-07-20 21:23:55,604 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:24:02,261 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:05,968 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:05,969 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:07,909 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-20 21:24:08,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:08,084 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:09,214 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:09,701 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:09,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:09,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:10,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:10,148 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:11,908 INFO L134 CoverageAnalysis]: Checked inductivity of 204138 backedges. 1703 proven. 11513 refuted. 0 times theorem prover too weak. 190922 trivial. 0 not checked. [2020-07-20 21:24:11,909 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2068453395] [2020-07-20 21:24:11,909 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:24:11,910 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 21:24:11,910 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1960766015] [2020-07-20 21:24:11,912 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:24:11,913 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:24:11,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:24:11,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:24:11,914 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-20 21:24:12,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:24:12,714 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-20 21:24:12,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:24:12,715 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1842 [2020-07-20 21:24:12,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:24:12,723 INFO L225 Difference]: With dead ends: 107 [2020-07-20 21:24:12,723 INFO L226 Difference]: Without dead ends: 103 [2020-07-20 21:24:12,725 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3692 GetRequests, 3644 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:24:12,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-20 21:24:12,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-20 21:24:12,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 21:24:12,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 21:24:12,749 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1842 [2020-07-20 21:24:12,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:24:12,752 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 21:24:12,752 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:24:12,752 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 21:24:12,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2614 [2020-07-20 21:24:12,831 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:24:12,833 INFO L422 BasicCegarLoop]: trace histogram [401, 401, 201, 200, 200, 200, 200, 200, 200, 200, 200, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:24:13,047 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:13,048 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:24:13,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:24:13,050 INFO L82 PathProgramCache]: Analyzing trace with hash -1810006087, now seen corresponding path program 9 times [2020-07-20 21:24:13,050 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:24:13,050 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [67667824] [2020-07-20 21:24:13,051 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:14,207 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:24:14,207 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:24:14,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 4931 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 21:24:14,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:24:18,468 INFO L134 CoverageAnalysis]: Checked inductivity of 420300 backedges. 2669 proven. 17854 refuted. 0 times theorem prover too weak. 399777 trivial. 0 not checked. [2020-07-20 21:24:18,469 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:24:29,334 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:35,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:37,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:39,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:39,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:40,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:40,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:40,961 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:40,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:41,223 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:41,372 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:41,454 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:44,896 INFO L134 CoverageAnalysis]: Checked inductivity of 420300 backedges. 2669 proven. 17971 refuted. 0 times theorem prover too weak. 399660 trivial. 0 not checked. [2020-07-20 21:24:44,897 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [67667824] [2020-07-20 21:24:44,897 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:24:44,898 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 21:24:44,898 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1070411874] [2020-07-20 21:24:44,901 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 21:24:44,902 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:24:44,902 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 21:24:44,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 21:24:44,903 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-20 21:24:46,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:24:46,130 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-20 21:24:46,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:24:46,138 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2613 [2020-07-20 21:24:46,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:24:46,148 INFO L225 Difference]: With dead ends: 112 [2020-07-20 21:24:46,149 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 21:24:46,151 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5236 GetRequests, 5183 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 21:24:46,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 21:24:46,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-20 21:24:46,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 21:24:46,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 21:24:46,181 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2613 [2020-07-20 21:24:46,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:24:46,184 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 21:24:46,184 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 21:24:46,185 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 21:24:46,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3553 [2020-07-20 21:24:46,351 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:24:46,354 INFO L422 BasicCegarLoop]: trace histogram [517, 517, 443, 258, 258, 258, 258, 258, 258, 258, 185, 74, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:24:46,568 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:46,569 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:24:46,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:24:46,571 INFO L82 PathProgramCache]: Analyzing trace with hash -2087937559, now seen corresponding path program 9 times [2020-07-20 21:24:46,571 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:24:46,571 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [178909843] [2020-07-20 21:24:46,572 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 21:24:48,117 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:24:48,118 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:24:48,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 6625 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 21:24:48,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:24:55,423 INFO L134 CoverageAnalysis]: Checked inductivity of 764059 backedges. 3120 proven. 25582 refuted. 0 times theorem prover too weak. 735357 trivial. 0 not checked. [2020-07-20 21:24:55,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:25:12,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:18,977 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:22,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:22,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:22,487 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-20 21:25:24,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:25,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:25,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:26,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:26,286 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:26,288 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:26,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:26,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:32,344 INFO L134 CoverageAnalysis]: Checked inductivity of 764059 backedges. 3120 proven. 25708 refuted. 0 times theorem prover too weak. 735231 trivial. 0 not checked. [2020-07-20 21:25:32,345 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [178909843] [2020-07-20 21:25:32,345 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:25:32,346 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 21:25:32,346 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1234698824] [2020-07-20 21:25:32,349 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 21:25:32,349 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:25:32,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 21:25:32,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 21:25:32,350 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-20 21:25:33,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:25:33,635 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-20 21:25:33,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:25:33,637 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 3552 [2020-07-20 21:25:33,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:25:33,647 INFO L225 Difference]: With dead ends: 117 [2020-07-20 21:25:33,648 INFO L226 Difference]: Without dead ends: 113 [2020-07-20 21:25:33,650 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7113 GetRequests, 7060 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 21:25:33,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-20 21:25:33,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-20 21:25:33,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 21:25:33,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 21:25:33,682 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 3552 [2020-07-20 21:25:33,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:25:33,686 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 21:25:33,686 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 21:25:33,687 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 21:25:33,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3784 [2020-07-20 21:25:33,885 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:25:33,887 INFO L422 BasicCegarLoop]: trace histogram [581, 581, 291, 290, 290, 290, 290, 290, 290, 290, 290, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:25:34,091 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:25:34,092 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:25:34,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:25:34,095 INFO L82 PathProgramCache]: Analyzing trace with hash -1690000259, now seen corresponding path program 10 times [2020-07-20 21:25:34,096 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:25:34,096 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [171517031] [2020-07-20 21:25:34,096 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 21:25:35,813 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:25:35,813 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:25:35,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 7133 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 21:25:35,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:25:41,864 INFO L134 CoverageAnalysis]: Checked inductivity of 883485 backedges. 4023 proven. 29032 refuted. 0 times theorem prover too weak. 850430 trivial. 0 not checked. [2020-07-20 21:25:41,864 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:25:57,408 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:57,409 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:06,587 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:11,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:13,175 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:14,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:15,559 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:15,560 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:15,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:16,265 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:16,416 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:16,501 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:21,402 INFO L134 CoverageAnalysis]: Checked inductivity of 883485 backedges. 4023 proven. 29177 refuted. 0 times theorem prover too weak. 850285 trivial. 0 not checked. [2020-07-20 21:26:21,402 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [171517031] [2020-07-20 21:26:21,402 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:26:21,403 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 21:26:21,403 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1383961996] [2020-07-20 21:26:21,406 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 21:26:21,406 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:26:21,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 21:26:21,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 21:26:21,408 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-20 21:26:23,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:26:23,569 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-20 21:26:23,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 21:26:23,571 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 3783 [2020-07-20 21:26:23,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:26:23,580 INFO L225 Difference]: With dead ends: 122 [2020-07-20 21:26:23,580 INFO L226 Difference]: Without dead ends: 118 [2020-07-20 21:26:23,582 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7577 GetRequests, 7519 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 21:26:23,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-20 21:26:23,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-20 21:26:23,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 21:26:23,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-20 21:26:23,606 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 3783 [2020-07-20 21:26:23,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:26:23,610 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-20 21:26:23,610 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 21:26:23,610 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-20 21:26:23,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4941 [2020-07-20 21:26:23,810 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:26:23,812 INFO L422 BasicCegarLoop]: trace histogram [727, 727, 571, 363, 363, 363, 363, 363, 363, 363, 208, 156, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:26:24,026 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:26:24,026 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:26:24,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:26:24,029 INFO L82 PathProgramCache]: Analyzing trace with hash 853155490, now seen corresponding path program 10 times [2020-07-20 21:26:24,030 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:26:24,030 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1660140990] [2020-07-20 21:26:24,030 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 21:26:25,820 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:26:25,820 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:26:25,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 9232 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 21:26:25,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:26:34,300 INFO L134 CoverageAnalysis]: Checked inductivity of 1481151 backedges. 5109 proven. 39044 refuted. 0 times theorem prover too weak. 1436998 trivial. 0 not checked. [2020-07-20 21:26:34,300 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:26:55,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:06,382 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:06,383 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:11,493 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:11,493 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:13,443 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:13,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:15,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:15,019 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:15,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:15,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:16,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:16,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:16,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:16,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:16,537 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:16,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:23,699 INFO L134 CoverageAnalysis]: Checked inductivity of 1481151 backedges. 5109 proven. 39199 refuted. 0 times theorem prover too weak. 1436843 trivial. 0 not checked. [2020-07-20 21:27:23,699 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1660140990] [2020-07-20 21:27:23,699 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:27:23,700 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 21:27:23,700 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378286931] [2020-07-20 21:27:23,704 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 21:27:23,704 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:27:23,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 21:27:23,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 21:27:23,705 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-20 21:27:24,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:27:24,373 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-20 21:27:24,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 21:27:24,378 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 4940 [2020-07-20 21:27:24,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:27:24,387 INFO L225 Difference]: With dead ends: 127 [2020-07-20 21:27:24,388 INFO L226 Difference]: Without dead ends: 123 [2020-07-20 21:27:24,389 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9890 GetRequests, 9832 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 21:27:24,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-20 21:27:24,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-20 21:27:24,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 21:27:24,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-20 21:27:24,413 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 4940 [2020-07-20 21:27:24,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:27:24,416 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-20 21:27:24,417 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 21:27:24,417 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-20 21:27:24,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6306 [2020-07-20 21:27:24,795 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:27:24,797 INFO L422 BasicCegarLoop]: trace histogram [969, 969, 485, 484, 484, 484, 484, 484, 484, 484, 484, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:27:25,012 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:27:25,013 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:27:25,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:27:25,016 INFO L82 PathProgramCache]: Analyzing trace with hash -428638537, now seen corresponding path program 11 times [2020-07-20 21:27:25,016 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:27:25,016 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [477126942] [2020-07-20 21:27:25,017 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 21:27:27,129 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:27:27,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:27:27,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 11889 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 21:27:27,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:27:38,644 INFO L134 CoverageAnalysis]: Checked inductivity of 2460414 backedges. 6256 proven. 54508 refuted. 0 times theorem prover too weak. 2399650 trivial. 0 not checked. [2020-07-20 21:27:38,644 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:28:07,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:15,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:22,736 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:22,737 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:25,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:25,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:28,012 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:29,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:29,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:29,870 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:29,870 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:30,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:30,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:30,499 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:30,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:30,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:43,072 INFO L134 CoverageAnalysis]: Checked inductivity of 2460414 backedges. 6256 proven. 54684 refuted. 0 times theorem prover too weak. 2399474 trivial. 0 not checked. [2020-07-20 21:28:43,072 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [477126942] [2020-07-20 21:28:43,072 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:28:43,074 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 21:28:43,074 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542343404] [2020-07-20 21:28:43,078 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 21:28:43,079 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:28:43,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 21:28:43,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:28:43,079 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-20 21:28:44,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:28:44,608 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-20 21:28:44,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 21:28:44,609 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 6305 [2020-07-20 21:28:44,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:28:44,622 INFO L225 Difference]: With dead ends: 132 [2020-07-20 21:28:44,622 INFO L226 Difference]: Without dead ends: 128 [2020-07-20 21:28:44,625 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12622 GetRequests, 12559 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 21:28:44,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-20 21:28:44,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-20 21:28:44,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 21:28:44,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-20 21:28:44,649 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 6305 [2020-07-20 21:28:44,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:28:44,653 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-20 21:28:44,654 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 21:28:44,654 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-20 21:28:45,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11537 [2020-07-20 21:28:45,298 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:28:45,302 INFO L422 BasicCegarLoop]: trace histogram [1679, 1679, 1455, 839, 839, 839, 839, 839, 839, 839, 616, 224, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:28:45,502 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:28:45,503 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:28:45,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:28:45,506 INFO L82 PathProgramCache]: Analyzing trace with hash 917175142, now seen corresponding path program 11 times [2020-07-20 21:28:45,506 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:28:45,506 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [182078219] [2020-07-20 21:28:45,507 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 21:28:49,035 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:28:49,036 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:28:49,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 21506 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 21:28:49,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:29:26,677 INFO L134 CoverageAnalysis]: Checked inductivity of 8098673 backedges. 10726 proven. 103331 refuted. 0 times theorem prover too weak. 7984616 trivial. 0 not checked. [2020-07-20 21:29:26,678 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:30:31,681 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 21:30:32,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:32,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:03,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:17,589 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:17,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:22,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:22,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:26,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:26,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:28,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:28,392 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:30,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:31,183 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:31,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:31,639 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:31,813 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:31,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:31,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:32:10,266 INFO L134 CoverageAnalysis]: Checked inductivity of 8098673 backedges. 10726 proven. 103518 refuted. 0 times theorem prover too weak. 7984429 trivial. 0 not checked. [2020-07-20 21:32:10,266 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [182078219] [2020-07-20 21:32:10,267 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:32:10,269 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 21:32:10,270 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29878595] [2020-07-20 21:32:10,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 21:32:10,278 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:32:10,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 21:32:10,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:32:10,279 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-20 21:32:14,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:32:14,055 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-20 21:32:14,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 21:32:14,059 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 11536 [2020-07-20 21:32:14,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:32:14,077 INFO L225 Difference]: With dead ends: 137 [2020-07-20 21:32:14,077 INFO L226 Difference]: Without dead ends: 133 [2020-07-20 21:32:14,079 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23083 GetRequests, 23020 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 21:32:14,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-20 21:32:14,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-20 21:32:14,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 21:32:14,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-20 21:32:14,115 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 11536 [2020-07-20 21:32:14,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:32:14,121 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-20 21:32:14,121 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 21:32:14,121 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-20 21:32:15,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11545 [2020-07-20 21:32:15,702 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:32:15,710 INFO L422 BasicCegarLoop]: trace histogram [1775, 1775, 888, 887, 887, 887, 887, 887, 887, 887, 887, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:32:15,924 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:32:15,925 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:32:15,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:32:15,931 INFO L82 PathProgramCache]: Analyzing trace with hash -1563811828, now seen corresponding path program 12 times [2020-07-20 21:32:15,931 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:32:15,931 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2049240699] [2020-07-20 21:32:15,933 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-07-20 21:32:20,829 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:32:20,829 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:32:20,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 21758 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 21:32:20,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:33:06,690 INFO L134 CoverageAnalysis]: Checked inductivity of 8262405 backedges. 11839 proven. 109733 refuted. 0 times theorem prover too weak. 8140833 trivial. 0 not checked. [2020-07-20 21:33:06,690 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:33:13,438 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 21:33:13,552 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 21:33:13,667 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 21:33:13,780 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 21:33:16,854 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 21:33:16,977 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 21:33:17,104 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 21:33:17,240 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 21:33:25,083 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 21:33:25,256 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 21:33:25,397 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 21:33:25,540 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 21:33:25,682 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-20 21:33:25,811 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-20 21:33:25,939 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-20 21:33:26,060 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-20 21:33:26,176 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 21:33:26,286 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-20 21:33:26,404 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 21:34:49,457 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 21:34:49,576 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 21:34:49,701 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 21:34:49,826 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 21:34:49,948 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-20 21:34:50,067 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 21:34:50,174 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 21:34:50,280 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 21:34:51,113 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:13,338 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:13,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:26,649 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 21:35:28,143 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 21:35:28,264 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 21:35:28,379 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 21:35:28,495 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 21:35:28,605 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 21:35:28,708 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 21:35:29,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:29,340 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:41,787 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 21:35:41,907 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 21:35:42,014 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 21:35:42,121 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 21:35:42,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts