/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_15-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 19:23:00,192 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-21 19:23:00,215 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 19:23:00,217 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 19:23:00,219 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 19:23:00,222 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 19:23:00,224 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 19:23:00,226 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 19:23:00,227 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 19:23:00,229 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 19:23:00,229 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 19:23:00,231 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 19:23:00,233 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 19:23:00,235 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 19:23:00,236 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 19:23:00,238 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 19:23:00,241 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 19:23:00,245 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 19:23:00,250 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 19:23:00,256 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 19:23:00,258 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 19:23:00,260 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 19:23:00,270 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 19:23:00,296 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 19:23:00,297 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 19:23:00,300 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 19:23:00,301 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 19:23:00,356 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 19:23:00,356 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 19:23:00,363 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 19:23:00,364 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 19:23:00,365 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 19:23:00,365 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 19:23:00,366 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 19:23:00,366 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 19:23:00,366 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 19:23:00,366 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 19:23:00,366 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 19:23:00,367 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 19:23:00,367 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 19:23:00,367 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 19:23:00,367 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 19:23:00,368 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 19:23:00,368 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 19:23:00,370 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 19:23:00,371 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 19:23:00,371 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 19:23:00,371 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 19:23:00,371 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:23:00,372 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 19:23:00,373 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 19:23:00,373 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 19:23:00,373 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 19:23:00,373 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:00,374 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 19:23:00,374 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 19:23:00,374 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 19:23:00,802 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 19:23:00,833 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 19:23:00,842 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 19:23:00,845 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 19:23:00,848 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 19:23:00,850 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_15-1.c [2020-07-21 19:23:00,972 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b4155cf0d/b39592a1bc9448118d755b5a93292b85/FLAG046bebbe8 [2020-07-21 19:23:01,678 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 19:23:01,679 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_15-1.c [2020-07-21 19:23:01,688 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b4155cf0d/b39592a1bc9448118d755b5a93292b85/FLAG046bebbe8 [2020-07-21 19:23:02,056 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b4155cf0d/b39592a1bc9448118d755b5a93292b85 [2020-07-21 19:23:02,070 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 19:23:02,074 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 19:23:02,076 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 19:23:02,076 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 19:23:02,083 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 19:23:02,084 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:23:02" (1/1) ... [2020-07-21 19:23:02,090 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@79d6361e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:23:02, skipping insertion in model container [2020-07-21 19:23:02,090 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:23:02" (1/1) ... [2020-07-21 19:23:02,099 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 19:23:02,120 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 19:23:02,345 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:23:02,352 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 19:23:02,369 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:23:02,386 INFO L208 MainTranslator]: Completed translation [2020-07-21 19:23:02,387 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:23:02 WrapperNode [2020-07-21 19:23:02,387 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 19:23:02,389 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 19:23:02,389 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 19:23:02,389 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 19:23:02,407 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:23:02" (1/1) ... [2020-07-21 19:23:02,407 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:23:02" (1/1) ... [2020-07-21 19:23:02,415 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:23:02" (1/1) ... [2020-07-21 19:23:02,416 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:23:02" (1/1) ... [2020-07-21 19:23:02,421 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:23:02" (1/1) ... [2020-07-21 19:23:02,424 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:23:02" (1/1) ... [2020-07-21 19:23:02,425 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:23:02" (1/1) ... [2020-07-21 19:23:02,427 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 19:23:02,428 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 19:23:02,428 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 19:23:02,428 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 19:23:02,430 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:23:02" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:23:02,612 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 19:23:02,612 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 19:23:02,612 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 19:23:02,614 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 19:23:02,614 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 19:23:02,615 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 19:23:02,615 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 19:23:02,615 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 19:23:02,616 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 19:23:02,616 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 19:23:02,869 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 19:23:02,869 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 19:23:02,875 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:23:02 BoogieIcfgContainer [2020-07-21 19:23:02,876 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 19:23:02,877 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 19:23:02,878 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 19:23:02,882 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 19:23:02,882 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 07:23:02" (1/3) ... [2020-07-21 19:23:02,884 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2df626cc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:23:02, skipping insertion in model container [2020-07-21 19:23:02,884 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:23:02" (2/3) ... [2020-07-21 19:23:02,884 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2df626cc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:23:02, skipping insertion in model container [2020-07-21 19:23:02,884 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:23:02" (3/3) ... [2020-07-21 19:23:02,887 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_15-1.c [2020-07-21 19:23:02,901 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 19:23:02,913 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 19:23:02,935 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 19:23:02,973 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 19:23:02,973 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 19:23:02,973 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 19:23:02,973 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 19:23:02,974 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 19:23:02,974 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 19:23:02,974 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 19:23:02,974 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 19:23:03,001 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 19:23:03,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 19:23:03,010 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:23:03,011 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:23:03,012 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:23:03,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:23:03,021 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 19:23:03,034 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:23:03,035 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [78471333] [2020-07-21 19:23:03,036 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:03,123 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:23:03,123 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:23:03,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 20 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 19:23:03,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:23:03,285 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:23:03,286 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:23:03,287 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [78471333] [2020-07-21 19:23:03,289 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:23:03,290 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:23:03,291 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [310724372] [2020-07-21 19:23:03,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:23:03,303 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:23:03,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:23:03,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:23:03,327 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 19:23:03,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:23:03,488 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 19:23:03,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:23:03,492 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 19:23:03,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:23:03,507 INFO L225 Difference]: With dead ends: 35 [2020-07-21 19:23:03,507 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 19:23:03,513 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 19:23:03,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 19:23:03,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 19:23:03,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 19:23:03,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 19:23:03,583 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 19:23:03,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:23:03,584 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 19:23:03,584 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:23:03,584 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 19:23:03,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 19:23:03,587 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:23:03,588 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:23:03,804 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:03,805 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:23:03,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:23:03,806 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 19:23:03,807 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:23:03,808 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [517611028] [2020-07-21 19:23:03,808 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:03,844 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:23:03,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:23:03,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 20 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 19:23:03,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:23:03,898 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:23:03,898 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:23:03,899 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [517611028] [2020-07-21 19:23:03,899 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:23:03,900 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:23:03,900 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400922340] [2020-07-21 19:23:03,903 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:23:03,904 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:23:03,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:23:03,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:23:03,905 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 19:23:04,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:23:04,012 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 19:23:04,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:23:04,013 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 19:23:04,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:23:04,015 INFO L225 Difference]: With dead ends: 27 [2020-07-21 19:23:04,016 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 19:23:04,017 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 19:23:04,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 19:23:04,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 19:23:04,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 19:23:04,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 19:23:04,027 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 19:23:04,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:23:04,028 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 19:23:04,028 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:23:04,028 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 19:23:04,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 19:23:04,030 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:23:04,031 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] [2020-07-21 19:23:04,247 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:04,249 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:23:04,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:23:04,250 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 19:23:04,251 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:23:04,251 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1023654466] [2020-07-21 19:23:04,252 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:04,305 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:23:04,305 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:23:04,307 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 19:23:04,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:23:04,372 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 19:23:04,373 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:23:04,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:04,702 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 19:23:04,703 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1023654466] [2020-07-21 19:23:04,704 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:23:04,704 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 19:23:04,705 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132255801] [2020-07-21 19:23:04,706 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 19:23:04,706 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:23:04,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 19:23:04,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 19:23:04,708 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 19:23:04,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:23:04,886 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 19:23:04,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 19:23:04,887 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 19:23:04,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:23:04,889 INFO L225 Difference]: With dead ends: 32 [2020-07-21 19:23:04,890 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 19:23:04,891 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 [2020-07-21 19:23:04,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 19:23:04,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 19:23:04,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 19:23:04,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 19:23:04,905 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 19:23:04,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:23:04,906 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 19:23:04,906 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 19:23:04,906 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 19:23:04,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 19:23:04,908 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:23:04,909 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] [2020-07-21 19:23:05,122 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:05,123 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:23:05,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:23:05,124 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 19:23:05,124 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:23:05,125 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [790189404] [2020-07-21 19:23:05,125 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:05,163 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:23:05,163 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:23:05,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 19:23:05,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:23:05,226 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 19:23:05,226 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:23:05,441 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:05,497 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 19:23:05,498 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [790189404] [2020-07-21 19:23:05,498 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:23:05,498 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 19:23:05,499 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [672871873] [2020-07-21 19:23:05,500 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 19:23:05,500 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:23:05,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 19:23:05,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 19:23:05,501 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 19:23:05,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:23:05,637 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 19:23:05,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 19:23:05,638 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 19:23:05,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:23:05,641 INFO L225 Difference]: With dead ends: 37 [2020-07-21 19:23:05,642 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 19:23:05,643 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 [2020-07-21 19:23:05,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 19:23:05,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 19:23:05,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 19:23:05,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 19:23:05,656 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 19:23:05,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:23:05,657 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 19:23:05,657 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 19:23:05,657 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 19:23:05,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 19:23:05,659 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:23:05,660 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] [2020-07-21 19:23:05,873 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:05,875 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:23:05,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:23:05,875 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 19:23:05,875 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:23:05,876 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [419558719] [2020-07-21 19:23:05,876 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:05,928 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:23:05,929 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:23:05,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:23:05,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:23:05,992 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 19:23:05,993 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:23:06,306 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:06,309 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:06,374 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:06,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:06,426 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 19:23:06,427 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [419558719] [2020-07-21 19:23:06,427 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:23:06,427 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 19:23:06,428 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315816533] [2020-07-21 19:23:06,429 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 19:23:06,429 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:23:06,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 19:23:06,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:23:06,431 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 19:23:06,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:23:06,663 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 19:23:06,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 19:23:06,666 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 19:23:06,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:23:06,669 INFO L225 Difference]: With dead ends: 42 [2020-07-21 19:23:06,670 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 19:23:06,674 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 [2020-07-21 19:23:06,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 19:23:06,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 19:23:06,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 19:23:06,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 19:23:06,699 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 19:23:06,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:23:06,702 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 19:23:06,702 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 19:23:06,703 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 19:23:06,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 19:23:06,706 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:23:06,708 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] [2020-07-21 19:23:06,909 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:06,910 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:23:06,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:23:06,911 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 19:23:06,912 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:23:06,912 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [80793245] [2020-07-21 19:23:06,913 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:06,957 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:23:06,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:23:06,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:23:06,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:23:07,020 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-21 19:23:07,020 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:23:07,277 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:07,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:07,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:07,385 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 19:23:07,386 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [80793245] [2020-07-21 19:23:07,387 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:23:07,387 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 19:23:07,387 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [535903609] [2020-07-21 19:23:07,388 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 19:23:07,388 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:23:07,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 19:23:07,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:23:07,389 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 19:23:07,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:23:07,576 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 19:23:07,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 19:23:07,577 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 19:23:07,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:23:07,582 INFO L225 Difference]: With dead ends: 47 [2020-07-21 19:23:07,583 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 19:23:07,589 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 [2020-07-21 19:23:07,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 19:23:07,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 19:23:07,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 19:23:07,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 19:23:07,617 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 19:23:07,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:23:07,619 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 19:23:07,619 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 19:23:07,620 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 19:23:07,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 19:23:07,631 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:23:07,631 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] [2020-07-21 19:23:07,839 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:07,840 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:23:07,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:23:07,841 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 19:23:07,841 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:23:07,842 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1813507764] [2020-07-21 19:23:07,842 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:07,897 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:23:07,898 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:23:07,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:23:07,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:23:07,997 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-21 19:23:07,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:23:08,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:08,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:08,680 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:08,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:08,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:08,813 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 19:23:08,814 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1813507764] [2020-07-21 19:23:08,814 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:23:08,814 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 19:23:08,814 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [369172870] [2020-07-21 19:23:08,815 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 19:23:08,816 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:23:08,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 19:23:08,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 19:23:08,817 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 19:23:09,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:23:09,063 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 19:23:09,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:23:09,064 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 19:23:09,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:23:09,067 INFO L225 Difference]: With dead ends: 52 [2020-07-21 19:23:09,067 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 19:23:09,068 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 [2020-07-21 19:23:09,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 19:23:09,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 19:23:09,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 19:23:09,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 19:23:09,083 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 19:23:09,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:23:09,084 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 19:23:09,084 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 19:23:09,084 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 19:23:09,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 19:23:09,086 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:23:09,087 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] [2020-07-21 19:23:09,289 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:09,290 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:23:09,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:23:09,291 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 19:23:09,291 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:23:09,292 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [326145418] [2020-07-21 19:23:09,293 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:09,365 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:23:09,365 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:23:09,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:23:09,371 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:23:09,458 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-21 19:23:09,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:23:09,991 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:10,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:10,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:10,191 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:10,246 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-21 19:23:10,247 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [326145418] [2020-07-21 19:23:10,247 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:23:10,247 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 19:23:10,248 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24923782] [2020-07-21 19:23:10,248 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 19:23:10,249 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:23:10,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 19:23:10,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 19:23:10,250 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-21 19:23:10,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:23:10,437 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 19:23:10,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:23:10,438 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-21 19:23:10,439 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:23:10,441 INFO L225 Difference]: With dead ends: 57 [2020-07-21 19:23:10,441 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 19:23:10,443 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 [2020-07-21 19:23:10,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 19:23:10,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 19:23:10,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 19:23:10,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 19:23:10,472 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 19:23:10,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:23:10,473 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 19:23:10,474 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 19:23:10,475 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 19:23:10,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 19:23:10,477 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:23:10,477 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] [2020-07-21 19:23:10,695 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:10,696 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:23:10,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:23:10,697 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 19:23:10,698 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:23:10,698 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1349014873] [2020-07-21 19:23:10,699 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:10,775 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:23:10,776 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:23:10,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:23:10,782 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:23:10,892 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-21 19:23:10,892 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:23:11,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:11,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:11,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:11,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:12,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:12,061 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 19:23:12,062 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1349014873] [2020-07-21 19:23:12,062 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:23:12,062 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 19:23:12,063 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630946284] [2020-07-21 19:23:12,064 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 19:23:12,064 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:23:12,064 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 19:23:12,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:23:12,065 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-21 19:23:12,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:23:12,478 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 19:23:12,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:23:12,479 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-21 19:23:12,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:23:12,482 INFO L225 Difference]: With dead ends: 62 [2020-07-21 19:23:12,483 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 19:23:12,484 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 [2020-07-21 19:23:12,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 19:23:12,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 19:23:12,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 19:23:12,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 19:23:12,500 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 19:23:12,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:23:12,505 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 19:23:12,505 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 19:23:12,505 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 19:23:12,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 19:23:12,512 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:23:12,512 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] [2020-07-21 19:23:12,727 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:12,728 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:23:12,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:23:12,729 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 19:23:12,730 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:23:12,730 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1156327895] [2020-07-21 19:23:12,731 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:12,834 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:23:12,834 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:23:12,836 INFO L263 TraceCheckSpWp]: Trace formula consists of 423 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:23:12,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:23:12,955 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-21 19:23:12,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:23:13,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:14,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:14,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:14,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:14,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:14,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:14,266 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-21 19:23:14,267 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1156327895] [2020-07-21 19:23:14,268 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:23:14,268 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 19:23:14,268 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69283785] [2020-07-21 19:23:14,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 19:23:14,270 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:23:14,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 19:23:14,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:23:14,271 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-21 19:23:14,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:23:14,513 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-21 19:23:14,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:23:14,513 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-21 19:23:14,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:23:14,516 INFO L225 Difference]: With dead ends: 67 [2020-07-21 19:23:14,517 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 19:23:14,518 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 19:23:14,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 19:23:14,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-21 19:23:14,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 19:23:14,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 19:23:14,533 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-21 19:23:14,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:23:14,534 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 19:23:14,534 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 19:23:14,534 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 19:23:14,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 19:23:14,539 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:23:14,539 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] [2020-07-21 19:23:14,753 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:14,755 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:23:14,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:23:14,756 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-21 19:23:14,756 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:23:14,757 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1917710463] [2020-07-21 19:23:14,757 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:14,907 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:23:14,907 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:23:14,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 639 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:23:14,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:23:15,059 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-21 19:23:15,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:23:16,473 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:16,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:17,024 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:17,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:17,171 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:17,172 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:17,319 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-21 19:23:17,319 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1917710463] [2020-07-21 19:23:17,320 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:23:17,320 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 19:23:17,321 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424310200] [2020-07-21 19:23:17,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:23:17,325 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:23:17,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:23:17,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:23:17,326 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-21 19:23:17,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:23:17,617 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-21 19:23:17,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:23:17,618 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-21 19:23:17,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:23:17,622 INFO L225 Difference]: With dead ends: 72 [2020-07-21 19:23:17,623 INFO L226 Difference]: Without dead ends: 68 [2020-07-21 19:23:17,624 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:23:17,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-21 19:23:17,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-21 19:23:17,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 19:23:17,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 19:23:17,671 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-21 19:23:17,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:23:17,674 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 19:23:17,674 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:23:17,675 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 19:23:17,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-21 19:23:17,682 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:23:17,683 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] [2020-07-21 19:23:17,896 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:17,897 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:23:17,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:23:17,898 INFO L82 PathProgramCache]: Analyzing trace with hash 1006419304, now seen corresponding path program 5 times [2020-07-21 19:23:17,899 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:23:17,899 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [382222235] [2020-07-21 19:23:17,900 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:18,062 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:23:18,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:23:18,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 665 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:23:18,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:23:18,269 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1055 refuted. 0 times theorem prover too weak. 3799 trivial. 0 not checked. [2020-07-21 19:23:18,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:23:19,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:20,203 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:20,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:20,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:20,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:20,550 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:20,662 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1095 refuted. 0 times theorem prover too weak. 3759 trivial. 0 not checked. [2020-07-21 19:23:20,663 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [382222235] [2020-07-21 19:23:20,663 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:23:20,663 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 19:23:20,663 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1260202742] [2020-07-21 19:23:20,664 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:23:20,665 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:23:20,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:23:20,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:23:20,666 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-21 19:23:20,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:23:20,962 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-21 19:23:20,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:23:20,963 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 299 [2020-07-21 19:23:20,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:23:20,967 INFO L225 Difference]: With dead ends: 77 [2020-07-21 19:23:20,967 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 19:23:20,968 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 [2020-07-21 19:23:20,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 19:23:20,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-21 19:23:20,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 19:23:20,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 19:23:20,985 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 299 [2020-07-21 19:23:20,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:23:20,986 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 19:23:20,986 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:23:20,987 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 19:23:21,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-21 19:23:21,003 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:23:21,004 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] [2020-07-21 19:23:21,218 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:21,219 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:23:21,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:23:21,220 INFO L82 PathProgramCache]: Analyzing trace with hash 785285043, now seen corresponding path program 6 times [2020-07-21 19:23:21,220 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:23:21,220 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1067786552] [2020-07-21 19:23:21,220 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:21,417 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:23:21,418 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:23:21,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 1132 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:23:21,429 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:23:21,673 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2126 refuted. 0 times theorem prover too weak. 12702 trivial. 0 not checked. [2020-07-21 19:23:21,673 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:23:23,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:24,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:24,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:24,926 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:24,927 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:25,026 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:25,088 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:25,089 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:25,342 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2177 refuted. 0 times theorem prover too weak. 12651 trivial. 0 not checked. [2020-07-21 19:23:25,343 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1067786552] [2020-07-21 19:23:25,343 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:23:25,343 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 19:23:25,343 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804672318] [2020-07-21 19:23:25,345 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 19:23:25,345 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:23:25,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 19:23:25,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:23:25,346 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-21 19:23:25,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:23:25,973 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-21 19:23:25,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:23:25,974 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 507 [2020-07-21 19:23:25,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:23:25,979 INFO L225 Difference]: With dead ends: 82 [2020-07-21 19:23:25,980 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 19:23:25,982 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 983 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 19:23:25,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 19:23:25,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-21 19:23:25,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 19:23:26,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 19:23:26,000 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 507 [2020-07-21 19:23:26,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:23:26,002 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 19:23:26,002 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 19:23:26,002 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 19:23:26,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-21 19:23:26,007 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:23:26,008 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] [2020-07-21 19:23:26,223 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:26,224 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:23:26,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:23:26,225 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-21 19:23:26,225 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:23:26,225 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [849462240] [2020-07-21 19:23:26,226 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:26,457 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:23:26,457 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:23:26,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 1000 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:23:26,471 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:23:26,736 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-21 19:23:26,737 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:23:28,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:29,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:29,471 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:29,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:29,832 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:30,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:30,109 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:30,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:30,172 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:30,304 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-21 19:23:30,304 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [849462240] [2020-07-21 19:23:30,305 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:23:30,305 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 19:23:30,305 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1018663156] [2020-07-21 19:23:30,307 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 19:23:30,307 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:23:30,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 19:23:30,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:23:30,308 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-21 19:23:30,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:23:30,728 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-21 19:23:30,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:23:30,730 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-21 19:23:30,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:23:30,735 INFO L225 Difference]: With dead ends: 87 [2020-07-21 19:23:30,735 INFO L226 Difference]: Without dead ends: 83 [2020-07-21 19:23:30,737 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 [2020-07-21 19:23:30,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-21 19:23:30,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-21 19:23:30,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 19:23:30,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 19:23:30,775 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-21 19:23:30,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:23:30,776 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 19:23:30,777 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 19:23:30,777 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 19:23:30,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1067 [2020-07-21 19:23:30,798 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:23:30,799 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] [2020-07-21 19:23:31,012 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:31,013 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:23:31,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:23:31,014 INFO L82 PathProgramCache]: Analyzing trace with hash 40336450, now seen corresponding path program 7 times [2020-07-21 19:23:31,014 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:23:31,014 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [571549482] [2020-07-21 19:23:31,015 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:31,562 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:23:31,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:23:31,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 2379 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:23:31,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:23:32,566 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5632 refuted. 0 times theorem prover too weak. 62583 trivial. 0 not checked. [2020-07-21 19:23:32,566 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:23:36,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:36,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:38,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:39,107 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:39,108 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:39,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:39,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:39,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:39,679 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:39,813 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:39,814 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:39,893 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:40,500 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5702 refuted. 0 times theorem prover too weak. 62513 trivial. 0 not checked. [2020-07-21 19:23:40,500 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [571549482] [2020-07-21 19:23:40,500 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:23:40,501 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 19:23:40,501 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [909978965] [2020-07-21 19:23:40,503 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 19:23:40,503 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:23:40,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 19:23:40,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:23:40,504 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-21 19:23:41,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:23:41,311 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-21 19:23:41,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:23:41,312 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1066 [2020-07-21 19:23:41,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:23:41,318 INFO L225 Difference]: With dead ends: 92 [2020-07-21 19:23:41,318 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 19:23:41,320 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2140 GetRequests, 2097 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:23:41,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 19:23:41,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-21 19:23:41,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 19:23:41,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 19:23:41,337 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1066 [2020-07-21 19:23:41,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:23:41,339 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 19:23:41,339 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 19:23:41,340 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 19:23:41,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 821 [2020-07-21 19:23:41,349 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:23:41,350 INFO L422 BasicCegarLoop]: trace histogram [119, 119, 99, 59, 59, 59, 59, 59, 59, 59, 40, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:23:41,563 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:41,564 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:23:41,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:23:41,565 INFO L82 PathProgramCache]: Analyzing trace with hash 256338188, now seen corresponding path program 7 times [2020-07-21 19:23:41,565 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:23:41,566 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [345031456] [2020-07-21 19:23:41,566 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:41,958 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:23:41,959 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:23:41,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 1821 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:23:41,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:23:42,427 INFO L134 CoverageAnalysis]: Checked inductivity of 39779 backedges. 582 proven. 4385 refuted. 0 times theorem prover too weak. 34812 trivial. 0 not checked. [2020-07-21 19:23:42,428 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:23:45,872 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:45,873 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:46,913 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:47,430 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:47,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:47,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:47,736 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:47,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:48,064 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:48,128 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:48,513 INFO L134 CoverageAnalysis]: Checked inductivity of 39779 backedges. 582 proven. 4462 refuted. 0 times theorem prover too weak. 34735 trivial. 0 not checked. [2020-07-21 19:23:48,514 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [345031456] [2020-07-21 19:23:48,514 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:23:48,515 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 19:23:48,515 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1318583151] [2020-07-21 19:23:48,520 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 19:23:48,521 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:23:48,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 19:23:48,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:23:48,522 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-21 19:23:49,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:23:49,364 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-21 19:23:49,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:23:49,365 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 820 [2020-07-21 19:23:49,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:23:49,372 INFO L225 Difference]: With dead ends: 97 [2020-07-21 19:23:49,372 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 19:23:49,373 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1647 GetRequests, 1604 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:23:49,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 19:23:49,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-21 19:23:49,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 19:23:49,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 19:23:49,396 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 820 [2020-07-21 19:23:49,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:23:49,399 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 19:23:49,399 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 19:23:49,399 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 19:23:49,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1405 [2020-07-21 19:23:49,420 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:23:49,421 INFO L422 BasicCegarLoop]: trace histogram [215, 215, 108, 107, 107, 107, 107, 107, 107, 107, 107, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:23:49,635 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:49,638 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:23:49,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:23:49,639 INFO L82 PathProgramCache]: Analyzing trace with hash -60458800, now seen corresponding path program 8 times [2020-07-21 19:23:49,639 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:23:49,640 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1547437206] [2020-07-21 19:23:49,640 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:23:50,293 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:23:50,294 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:23:50,305 INFO L263 TraceCheckSpWp]: Trace formula consists of 3133 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 19:23:50,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:23:51,349 INFO L134 CoverageAnalysis]: Checked inductivity of 120375 backedges. 1323 proven. 8355 refuted. 0 times theorem prover too weak. 110697 trivial. 0 not checked. [2020-07-21 19:23:51,349 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:23:56,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:23:59,400 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:00,916 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:01,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:01,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:01,826 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:01,827 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:02,031 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:02,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:02,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:02,206 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:02,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:03,151 INFO L134 CoverageAnalysis]: Checked inductivity of 120375 backedges. 1323 proven. 8447 refuted. 0 times theorem prover too weak. 110605 trivial. 0 not checked. [2020-07-21 19:24:03,152 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1547437206] [2020-07-21 19:24:03,152 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:24:03,153 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 19:24:03,153 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954915388] [2020-07-21 19:24:03,155 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 19:24:03,156 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:24:03,156 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 19:24:03,156 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:24:03,157 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-21 19:24:04,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:24:04,002 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-21 19:24:04,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:24:04,003 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1404 [2020-07-21 19:24:04,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:24:04,010 INFO L225 Difference]: With dead ends: 102 [2020-07-21 19:24:04,011 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 19:24:04,012 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2817 GetRequests, 2769 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 19:24:04,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 19:24:04,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-21 19:24:04,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 19:24:04,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 19:24:04,029 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1404 [2020-07-21 19:24:04,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:24:04,031 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 19:24:04,031 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 19:24:04,031 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 19:24:04,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1521 [2020-07-21 19:24:04,060 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:24:04,061 INFO L422 BasicCegarLoop]: trace histogram [223, 223, 175, 111, 111, 111, 111, 111, 111, 111, 64, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:24:04,274 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:24:04,275 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:24:04,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:24:04,276 INFO L82 PathProgramCache]: Analyzing trace with hash 1003822174, now seen corresponding path program 8 times [2020-07-21 19:24:04,277 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:24:04,277 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [4605484] [2020-07-21 19:24:04,278 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:24:04,966 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:24:04,966 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:24:04,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 3377 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 19:24:04,998 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:24:06,322 INFO L134 CoverageAnalysis]: Checked inductivity of 138657 backedges. 1357 proven. 9367 refuted. 0 times theorem prover too weak. 127933 trivial. 0 not checked. [2020-07-21 19:24:06,322 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:24:12,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:14,761 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:14,762 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:15,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:15,947 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:16,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:17,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:17,112 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:17,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:17,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:17,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:18,633 INFO L134 CoverageAnalysis]: Checked inductivity of 138657 backedges. 1357 proven. 9467 refuted. 0 times theorem prover too weak. 127833 trivial. 0 not checked. [2020-07-21 19:24:18,633 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [4605484] [2020-07-21 19:24:18,634 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:24:18,634 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 19:24:18,634 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788978264] [2020-07-21 19:24:18,636 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 19:24:18,637 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:24:18,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 19:24:18,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:24:18,638 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-21 19:24:19,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:24:19,180 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-21 19:24:19,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:24:19,181 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1520 [2020-07-21 19:24:19,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:24:19,187 INFO L225 Difference]: With dead ends: 107 [2020-07-21 19:24:19,188 INFO L226 Difference]: Without dead ends: 103 [2020-07-21 19:24:19,190 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3048 GetRequests, 3000 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 19:24:19,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-21 19:24:19,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-21 19:24:19,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 19:24:19,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 19:24:19,211 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1520 [2020-07-21 19:24:19,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:24:19,212 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 19:24:19,212 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 19:24:19,213 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 19:24:19,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2731 [2020-07-21 19:24:19,287 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:24:19,288 INFO L422 BasicCegarLoop]: trace histogram [419, 419, 210, 209, 209, 209, 209, 209, 209, 209, 209, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:24:19,499 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:24:19,500 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:24:19,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:24:19,502 INFO L82 PathProgramCache]: Analyzing trace with hash 221762484, now seen corresponding path program 9 times [2020-07-21 19:24:19,502 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:24:19,503 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [732946036] [2020-07-21 19:24:19,503 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:24:20,699 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:24:20,699 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:24:20,721 INFO L263 TraceCheckSpWp]: Trace formula consists of 6091 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 19:24:20,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:24:24,398 INFO L134 CoverageAnalysis]: Checked inductivity of 458964 backedges. 2784 proven. 18684 refuted. 0 times theorem prover too weak. 437496 trivial. 0 not checked. [2020-07-21 19:24:24,398 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:24:34,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:40,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:43,421 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:44,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:44,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:45,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:45,515 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:45,998 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:45,999 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:46,216 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:46,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:46,399 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:24:49,494 INFO L134 CoverageAnalysis]: Checked inductivity of 458964 backedges. 2784 proven. 18801 refuted. 0 times theorem prover too weak. 437379 trivial. 0 not checked. [2020-07-21 19:24:49,495 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [732946036] [2020-07-21 19:24:49,495 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:24:49,496 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 19:24:49,496 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [319728854] [2020-07-21 19:24:49,498 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 19:24:49,499 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:24:49,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 19:24:49,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 19:24:49,501 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-21 19:24:50,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:24:50,752 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-21 19:24:50,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 19:24:50,754 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2730 [2020-07-21 19:24:50,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:24:50,761 INFO L225 Difference]: With dead ends: 112 [2020-07-21 19:24:50,762 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 19:24:50,764 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5470 GetRequests, 5417 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 19:24:50,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 19:24:50,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-21 19:24:50,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 19:24:50,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 19:24:50,784 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2730 [2020-07-21 19:24:50,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:24:50,786 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 19:24:50,786 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 19:24:50,787 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 19:24:50,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2865 [2020-07-21 19:24:50,861 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:24:50,863 INFO L422 BasicCegarLoop]: trace histogram [419, 419, 343, 209, 209, 209, 209, 209, 209, 209, 134, 76, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:24:51,078 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:24:51,078 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:24:51,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:24:51,080 INFO L82 PathProgramCache]: Analyzing trace with hash 565204626, now seen corresponding path program 9 times [2020-07-21 19:24:51,081 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:24:51,081 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [392406664] [2020-07-21 19:24:51,081 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:24:52,305 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:24:52,306 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:24:52,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 6359 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 19:24:52,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:24:57,144 INFO L134 CoverageAnalysis]: Checked inductivity of 495881 backedges. 2784 proven. 20214 refuted. 0 times theorem prover too weak. 472883 trivial. 0 not checked. [2020-07-21 19:24:57,145 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:25:07,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:25:14,848 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:25:17,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:25:17,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:25:18,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:25:19,926 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:25:20,441 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:25:20,675 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:25:20,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:25:20,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:25:20,886 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:25:20,887 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:25:24,252 INFO L134 CoverageAnalysis]: Checked inductivity of 495881 backedges. 2784 proven. 20340 refuted. 0 times theorem prover too weak. 472757 trivial. 0 not checked. [2020-07-21 19:25:24,253 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [392406664] [2020-07-21 19:25:24,253 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:25:24,254 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 19:25:24,254 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1587367854] [2020-07-21 19:25:24,256 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 19:25:24,256 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:25:24,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 19:25:24,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 19:25:24,257 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-21 19:25:25,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:25:25,721 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-21 19:25:25,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 19:25:25,724 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2864 [2020-07-21 19:25:25,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:25:25,731 INFO L225 Difference]: With dead ends: 117 [2020-07-21 19:25:25,731 INFO L226 Difference]: Without dead ends: 113 [2020-07-21 19:25:25,733 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5737 GetRequests, 5684 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 19:25:25,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-21 19:25:25,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-21 19:25:25,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 19:25:25,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 19:25:25,758 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2864 [2020-07-21 19:25:25,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:25:25,760 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 19:25:25,760 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 19:25:25,761 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 19:25:25,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3979 [2020-07-21 19:25:25,884 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:25:25,886 INFO L422 BasicCegarLoop]: trace histogram [611, 611, 306, 305, 305, 305, 305, 305, 305, 305, 305, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:25:26,086 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:25:26,090 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:25:26,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:25:26,093 INFO L82 PathProgramCache]: Analyzing trace with hash 1096565120, now seen corresponding path program 10 times [2020-07-21 19:25:26,093 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:25:26,093 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1605216750] [2020-07-21 19:25:26,094 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:25:27,801 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:25:27,801 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:25:27,834 INFO L263 TraceCheckSpWp]: Trace formula consists of 8875 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 19:25:27,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:25:34,814 INFO L134 CoverageAnalysis]: Checked inductivity of 977220 backedges. 4000 proven. 30795 refuted. 0 times theorem prover too weak. 942425 trivial. 0 not checked. [2020-07-21 19:25:34,815 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:25:54,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:25:54,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:26:03,491 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:26:07,582 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:26:09,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:26:11,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:26:12,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:26:12,557 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:26:13,149 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:26:13,424 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:26:13,587 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:26:13,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:26:19,929 INFO L134 CoverageAnalysis]: Checked inductivity of 977220 backedges. 4000 proven. 30940 refuted. 0 times theorem prover too weak. 942280 trivial. 0 not checked. [2020-07-21 19:26:19,930 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1605216750] [2020-07-21 19:26:19,930 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:26:19,931 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 19:26:19,931 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546899271] [2020-07-21 19:26:19,934 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 19:26:19,935 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:26:19,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 19:26:19,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 19:26:19,936 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-21 19:26:21,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:26:21,575 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-21 19:26:21,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 19:26:21,580 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 3978 [2020-07-21 19:26:21,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:26:21,589 INFO L225 Difference]: With dead ends: 122 [2020-07-21 19:26:21,590 INFO L226 Difference]: Without dead ends: 118 [2020-07-21 19:26:21,591 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7967 GetRequests, 7909 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 19:26:21,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-21 19:26:21,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-21 19:26:21,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 19:26:21,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 19:26:21,617 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 3978 [2020-07-21 19:26:21,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:26:21,621 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 19:26:21,621 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 19:26:21,621 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 19:26:21,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5131 [2020-07-21 19:26:21,791 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:26:21,793 INFO L422 BasicCegarLoop]: trace histogram [755, 755, 593, 377, 377, 377, 377, 377, 377, 377, 216, 162, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:26:21,994 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:26:21,994 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:26:21,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:26:21,997 INFO L82 PathProgramCache]: Analyzing trace with hash 1930612962, now seen corresponding path program 10 times [2020-07-21 19:26:21,997 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:26:21,997 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2132895248] [2020-07-21 19:26:21,998 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:26:24,199 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:26:24,200 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:26:24,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 11395 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 19:26:24,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:26:34,498 INFO L134 CoverageAnalysis]: Checked inductivity of 1597572 backedges. 5277 proven. 40602 refuted. 0 times theorem prover too weak. 1551693 trivial. 0 not checked. [2020-07-21 19:26:34,499 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:26:58,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:27:13,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:27:13,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:27:20,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:27:20,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:27:23,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:27:23,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:27:26,150 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:27:26,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:27:27,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:27:27,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:27:27,960 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:27:28,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:27:28,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:27:28,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:27:28,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:27:28,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:27:39,217 INFO L134 CoverageAnalysis]: Checked inductivity of 1597572 backedges. 5277 proven. 40757 refuted. 0 times theorem prover too weak. 1551538 trivial. 0 not checked. [2020-07-21 19:27:39,218 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2132895248] [2020-07-21 19:27:39,218 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:27:39,220 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 19:27:39,220 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1344656704] [2020-07-21 19:27:39,223 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 19:27:39,224 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:27:39,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 19:27:39,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 19:27:39,225 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-21 19:27:41,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:27:41,639 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-21 19:27:41,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 19:27:41,644 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 5130 [2020-07-21 19:27:41,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:27:41,654 INFO L225 Difference]: With dead ends: 127 [2020-07-21 19:27:41,654 INFO L226 Difference]: Without dead ends: 123 [2020-07-21 19:27:41,656 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10270 GetRequests, 10212 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 19:27:41,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-21 19:27:41,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-21 19:27:41,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 19:27:41,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 19:27:41,682 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 5130 [2020-07-21 19:27:41,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:27:41,687 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 19:27:41,687 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 19:27:41,687 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 19:27:41,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5461 [2020-07-21 19:27:41,892 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:27:41,894 INFO L422 BasicCegarLoop]: trace histogram [839, 839, 420, 419, 419, 419, 419, 419, 419, 419, 419, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:27:42,107 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:27:42,108 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:27:42,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:27:42,111 INFO L82 PathProgramCache]: Analyzing trace with hash -1050665484, now seen corresponding path program 11 times [2020-07-21 19:27:42,112 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:27:42,112 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1869740869] [2020-07-21 19:27:42,112 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:27:44,460 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:27:44,460 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:27:44,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 12181 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 19:27:44,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:27:56,949 INFO L134 CoverageAnalysis]: Checked inductivity of 1844019 backedges. 6015 proven. 46494 refuted. 0 times theorem prover too weak. 1791510 trivial. 0 not checked. [2020-07-21 19:27:56,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:28:02,520 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 19:28:02,623 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 19:28:05,077 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 19:28:05,189 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 19:28:05,309 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 19:28:05,426 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 19:28:05,543 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-21 19:28:05,651 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-21 19:28:05,754 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-21 19:28:25,733 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 19:28:30,777 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 19:28:30,882 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 19:28:31,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:28:45,585 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 19:28:46,387 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:28:57,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:28:57,980 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:04,388 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:04,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:06,236 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:07,922 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:07,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:09,024 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:09,025 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:09,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:10,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:10,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:10,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:10,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:29:22,740 INFO L134 CoverageAnalysis]: Checked inductivity of 1844019 backedges. 6015 proven. 46670 refuted. 0 times theorem prover too weak. 1791334 trivial. 0 not checked. [2020-07-21 19:29:22,740 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1869740869] [2020-07-21 19:29:22,741 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:29:22,743 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 19:29:22,743 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995566206] [2020-07-21 19:29:22,748 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 19:29:22,748 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:29:22,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 19:29:22,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:29:22,749 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-21 19:29:24,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:29:24,972 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-21 19:29:24,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 19:29:24,975 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 5460 [2020-07-21 19:29:24,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:29:24,984 INFO L225 Difference]: With dead ends: 132 [2020-07-21 19:29:24,985 INFO L226 Difference]: Without dead ends: 128 [2020-07-21 19:29:24,987 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10932 GetRequests, 10869 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 19:29:24,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-21 19:29:25,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-21 19:29:25,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 19:29:25,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 19:29:25,018 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 5460 [2020-07-21 19:29:25,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:29:25,023 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 19:29:25,023 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 19:29:25,023 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 19:29:26,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12481 [2020-07-21 19:29:26,318 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:29:26,322 INFO L422 BasicCegarLoop]: trace histogram [1819, 1819, 1559, 909, 909, 909, 909, 909, 909, 909, 650, 260, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:29:26,523 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:29:26,524 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:29:26,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:29:26,528 INFO L82 PathProgramCache]: Analyzing trace with hash -1023986388, now seen corresponding path program 11 times [2020-07-21 19:29:26,528 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:29:26,529 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1976033108] [2020-07-21 19:29:26,529 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:29:31,503 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:29:31,504 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:29:31,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 27691 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 19:29:31,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:24,607 INFO L134 CoverageAnalysis]: Checked inductivity of 9479089 backedges. 12000 proven. 111425 refuted. 0 times theorem prover too weak. 9355664 trivial. 0 not checked. [2020-07-21 19:30:24,607 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:31:26,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:26,954 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:48,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:56,862 WARN L193 SmtUtils]: Spent 908.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 19:31:59,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:59,721 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:09,826 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:09,827 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:13,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:13,510 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:16,661 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:16,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:18,088 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:18,842 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:19,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:19,200 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:19,363 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:19,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:19,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:21,017 INFO L134 CoverageAnalysis]: Checked inductivity of 9479089 backedges. 12000 proven. 111612 refuted. 0 times theorem prover too weak. 9355477 trivial. 0 not checked. [2020-07-21 19:33:21,018 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1976033108] [2020-07-21 19:33:21,018 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:33:21,021 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 19:33:21,021 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102620586] [2020-07-21 19:33:21,030 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 19:33:21,030 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:33:21,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 19:33:21,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:33:21,031 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-21 19:33:22,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:33:22,260 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-21 19:33:22,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 19:33:22,262 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 12480 [2020-07-21 19:33:22,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:33:22,280 INFO L225 Difference]: With dead ends: 137 [2020-07-21 19:33:22,280 INFO L226 Difference]: Without dead ends: 133 [2020-07-21 19:33:22,282 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24971 GetRequests, 24908 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 19:33:22,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-21 19:33:22,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-21 19:33:22,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 19:33:22,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 19:33:22,315 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 12480 [2020-07-21 19:33:22,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:33:22,322 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 19:33:22,322 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 19:33:22,322 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 19:33:24,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17551 [2020-07-21 19:33:24,523 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:33:24,528 INFO L422 BasicCegarLoop]: trace histogram [2699, 2699, 1350, 1349, 1349, 1349, 1349, 1349, 1349, 1349, 1349, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:33:24,729 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:33:24,730 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:33:24,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:33:24,735 INFO L82 PathProgramCache]: Analyzing trace with hash 408702146, now seen corresponding path program 12 times [2020-07-21 19:33:24,735 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:33:24,735 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1311277632] [2020-07-21 19:33:24,736 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:33:30,886 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:33:30,887 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:33:31,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 39151 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 19:33:31,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:35:30,043 INFO L134 CoverageAnalysis]: Checked inductivity of 19109934 backedges. 19826 proven. 165502 refuted. 0 times theorem prover too weak. 18924606 trivial. 0 not checked. [2020-07-21 19:35:30,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:35:45,742 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 19:35:45,845 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 19:35:45,953 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 19:35:46,064 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 19:35:54,891 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-21 19:35:55,012 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-21 19:35:55,130 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 19:35:55,241 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 19:35:55,349 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-21 19:35:55,453 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 88