/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 13:34:15,861 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 13:34:15,863 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 13:34:15,878 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 13:34:15,878 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 13:34:15,879 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 13:34:15,881 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 13:34:15,883 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 13:34:15,884 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 13:34:15,885 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 13:34:15,886 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 13:34:15,887 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 13:34:15,888 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 13:34:15,889 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 13:34:15,890 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 13:34:15,891 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 13:34:15,892 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 13:34:15,893 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 13:34:15,894 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 13:34:15,896 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 13:34:15,898 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 13:34:15,899 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 13:34:15,900 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 13:34:15,901 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 13:34:15,903 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 13:34:15,911 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 13:34:15,912 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 13:34:15,913 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 13:34:15,914 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 13:34:15,930 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 13:34:15,930 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 13:34:15,931 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 13:34:15,932 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 13:34:15,932 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 13:34:15,932 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 13:34:15,932 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 13:34:15,933 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 13:34:15,933 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 13:34:15,933 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 13:34:15,933 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 13:34:15,933 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 13:34:15,934 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 13:34:15,934 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 13:34:15,934 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 13:34:15,934 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 13:34:15,934 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 13:34:15,935 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 13:34:15,935 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 13:34:15,935 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 13:34:15,935 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 13:34:15,936 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:34:15,936 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 13:34:15,936 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 13:34:15,936 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 13:34:15,937 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 13:34:15,937 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:15,937 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 13:34:15,937 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 13:34:15,937 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 13:34:16,256 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 13:34:16,275 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 13:34:16,279 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 13:34:16,281 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 13:34:16,281 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 13:34:16,282 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_25-2.c [2020-07-20 13:34:16,368 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1ad4fd770/66e28e7456004fdfafbb137d7e861594/FLAG8e851280f [2020-07-20 13:34:16,922 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 13:34:16,923 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_25-2.c [2020-07-20 13:34:16,931 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1ad4fd770/66e28e7456004fdfafbb137d7e861594/FLAG8e851280f [2020-07-20 13:34:17,301 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1ad4fd770/66e28e7456004fdfafbb137d7e861594 [2020-07-20 13:34:17,313 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 13:34:17,316 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 13:34:17,317 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 13:34:17,317 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 13:34:17,321 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 13:34:17,322 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:34:17" (1/1) ... [2020-07-20 13:34:17,325 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@656f572e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:17, skipping insertion in model container [2020-07-20 13:34:17,326 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 01:34:17" (1/1) ... [2020-07-20 13:34:17,334 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 13:34:17,356 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 13:34:17,549 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:34:17,554 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 13:34:17,573 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 13:34:17,589 INFO L208 MainTranslator]: Completed translation [2020-07-20 13:34:17,590 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:17 WrapperNode [2020-07-20 13:34:17,590 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 13:34:17,591 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 13:34:17,591 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 13:34:17,591 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 13:34:17,606 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:17" (1/1) ... [2020-07-20 13:34:17,606 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:17" (1/1) ... [2020-07-20 13:34:17,612 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:17" (1/1) ... [2020-07-20 13:34:17,613 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:17" (1/1) ... [2020-07-20 13:34:17,716 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:17" (1/1) ... [2020-07-20 13:34:17,722 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:17" (1/1) ... [2020-07-20 13:34:17,723 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:17" (1/1) ... [2020-07-20 13:34:17,725 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 13:34:17,726 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 13:34:17,726 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 13:34:17,726 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 13:34:17,727 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:17" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 13:34:17,800 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 13:34:17,800 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 13:34:17,800 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-20 13:34:17,801 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-20 13:34:17,801 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 13:34:17,801 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 13:34:17,801 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 13:34:17,802 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-20 13:34:17,802 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-20 13:34:17,802 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 13:34:17,803 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 13:34:17,803 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 13:34:18,012 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 13:34:18,013 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 13:34:18,018 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:34:18 BoogieIcfgContainer [2020-07-20 13:34:18,018 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 13:34:18,020 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 13:34:18,020 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 13:34:18,024 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 13:34:18,024 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 01:34:17" (1/3) ... [2020-07-20 13:34:18,025 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3fc66675 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:34:18, skipping insertion in model container [2020-07-20 13:34:18,025 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 01:34:17" (2/3) ... [2020-07-20 13:34:18,026 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3fc66675 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 01:34:18, skipping insertion in model container [2020-07-20 13:34:18,026 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 01:34:18" (3/3) ... [2020-07-20 13:34:18,028 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_25-2.c [2020-07-20 13:34:18,040 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 13:34:18,049 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 13:34:18,064 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 13:34:18,093 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 13:34:18,093 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 13:34:18,093 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 13:34:18,094 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 13:34:18,094 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 13:34:18,094 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 13:34:18,094 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 13:34:18,094 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 13:34:18,115 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-20 13:34:18,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 13:34:18,122 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:18,123 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:18,124 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:18,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:18,130 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-20 13:34:18,138 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:18,139 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1476427454] [2020-07-20 13:34:18,139 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:18,224 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:18,225 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:18,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:34:18,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:18,345 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:34:18,345 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:34:18,347 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1476427454] [2020-07-20 13:34:18,347 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:34:18,348 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:34:18,349 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460849314] [2020-07-20 13:34:18,356 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:34:18,356 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:18,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:34:18,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:34:18,376 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-20 13:34:18,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:18,503 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-20 13:34:18,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:34:18,506 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 13:34:18,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:18,518 INFO L225 Difference]: With dead ends: 44 [2020-07-20 13:34:18,518 INFO L226 Difference]: Without dead ends: 30 [2020-07-20 13:34:18,522 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 13:34:18,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-20 13:34:18,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-20 13:34:18,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 13:34:18,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 13:34:18,579 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-20 13:34:18,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:18,579 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 13:34:18,579 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:34:18,580 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 13:34:18,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 13:34:18,582 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:18,582 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:18,800 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:18,801 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:18,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:18,801 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-20 13:34:18,802 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:18,802 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [935496948] [2020-07-20 13:34:18,803 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:18,833 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:18,834 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:18,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 29 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 13:34:18,837 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:18,873 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 13:34:18,874 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 13:34:18,874 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [935496948] [2020-07-20 13:34:18,875 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 13:34:18,875 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 13:34:18,875 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908173494] [2020-07-20 13:34:18,877 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 13:34:18,878 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:18,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 13:34:18,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 13:34:18,879 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-20 13:34:18,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:18,952 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-20 13:34:18,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 13:34:18,953 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 13:34:18,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:18,955 INFO L225 Difference]: With dead ends: 36 [2020-07-20 13:34:18,955 INFO L226 Difference]: Without dead ends: 32 [2020-07-20 13:34:18,957 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 13:34:18,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-20 13:34:18,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-20 13:34:18,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 13:34:18,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-20 13:34:18,968 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-20 13:34:18,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:18,968 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-20 13:34:18,969 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 13:34:18,969 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-20 13:34:18,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 13:34:18,971 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:18,971 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:19,187 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:19,188 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:19,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:19,190 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-20 13:34:19,190 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:19,191 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [277457554] [2020-07-20 13:34:19,191 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:19,248 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:19,248 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:19,249 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:34:19,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:19,319 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 13:34:19,320 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:19,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:19,523 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:19,566 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 13:34:19,567 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [277457554] [2020-07-20 13:34:19,567 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:19,567 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 13:34:19,568 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [838847389] [2020-07-20 13:34:19,569 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 13:34:19,569 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:19,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 13:34:19,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 13:34:19,570 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-20 13:34:19,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:19,710 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-20 13:34:19,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:34:19,711 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-20 13:34:19,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:19,713 INFO L225 Difference]: With dead ends: 41 [2020-07-20 13:34:19,714 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 13:34:19,715 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:34:19,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 13:34:19,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-20 13:34:19,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 13:34:19,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 13:34:19,725 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-20 13:34:19,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:19,726 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 13:34:19,726 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 13:34:19,726 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 13:34:19,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 13:34:19,728 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:19,728 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:19,942 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:19,943 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:19,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:19,944 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-20 13:34:19,945 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:19,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1698749608] [2020-07-20 13:34:19,946 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:19,978 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:19,978 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:19,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 13:34:19,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:20,030 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 13:34:20,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:20,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:20,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:20,288 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 13:34:20,289 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1698749608] [2020-07-20 13:34:20,290 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:20,290 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 13:34:20,290 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43392457] [2020-07-20 13:34:20,291 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 13:34:20,292 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:20,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 13:34:20,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-20 13:34:20,294 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-20 13:34:20,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:20,452 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-20 13:34:20,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 13:34:20,452 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-20 13:34:20,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:20,458 INFO L225 Difference]: With dead ends: 46 [2020-07-20 13:34:20,458 INFO L226 Difference]: Without dead ends: 42 [2020-07-20 13:34:20,461 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:34:20,462 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-20 13:34:20,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-20 13:34:20,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-20 13:34:20,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-20 13:34:20,482 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-20 13:34:20,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:20,483 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-20 13:34:20,483 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 13:34:20,488 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-20 13:34:20,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 13:34:20,492 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:20,492 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:20,706 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:20,707 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:20,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:20,708 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-20 13:34:20,708 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:20,709 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [952674719] [2020-07-20 13:34:20,709 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:20,760 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:20,761 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:20,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:34:20,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:20,832 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 13:34:20,833 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:21,092 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:21,164 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:21,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:21,245 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 13:34:21,246 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [952674719] [2020-07-20 13:34:21,247 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:21,247 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 13:34:21,247 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818360368] [2020-07-20 13:34:21,248 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 13:34:21,248 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:21,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 13:34:21,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:34:21,249 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-20 13:34:21,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:21,433 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-20 13:34:21,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:34:21,433 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-20 13:34:21,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:21,435 INFO L225 Difference]: With dead ends: 51 [2020-07-20 13:34:21,435 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 13:34:21,438 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:34:21,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 13:34:21,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-20 13:34:21,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 13:34:21,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 13:34:21,456 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-20 13:34:21,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:21,456 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 13:34:21,456 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 13:34:21,456 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 13:34:21,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 13:34:21,458 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:21,459 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:21,663 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:21,664 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:21,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:21,665 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-20 13:34:21,666 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:21,666 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1239687614] [2020-07-20 13:34:21,667 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:21,697 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:21,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:21,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 13:34:21,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:21,752 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 13:34:21,753 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:21,978 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:22,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:22,039 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:22,077 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 13:34:22,078 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1239687614] [2020-07-20 13:34:22,078 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:22,078 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-20 13:34:22,078 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1694059690] [2020-07-20 13:34:22,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 13:34:22,079 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:22,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 13:34:22,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-20 13:34:22,080 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-20 13:34:22,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:22,280 INFO L93 Difference]: Finished difference Result 56 states and 84 transitions. [2020-07-20 13:34:22,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 13:34:22,282 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-20 13:34:22,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:22,287 INFO L225 Difference]: With dead ends: 56 [2020-07-20 13:34:22,287 INFO L226 Difference]: Without dead ends: 52 [2020-07-20 13:34:22,288 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-20 13:34:22,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-20 13:34:22,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2020-07-20 13:34:22,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-20 13:34:22,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-20 13:34:22,319 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 40 [2020-07-20 13:34:22,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:22,320 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-20 13:34:22,320 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 13:34:22,321 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-20 13:34:22,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-20 13:34:22,327 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:22,327 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:22,533 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:22,534 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:22,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:22,535 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2020-07-20 13:34:22,535 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:22,536 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1262644262] [2020-07-20 13:34:22,536 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:22,574 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:22,574 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:22,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:34:22,578 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:22,654 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 13:34:22,655 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:23,013 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:23,014 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:23,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:23,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:23,221 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 13:34:23,222 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1262644262] [2020-07-20 13:34:23,222 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:23,223 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 13:34:23,223 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079833532] [2020-07-20 13:34:23,223 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 13:34:23,224 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:23,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 13:34:23,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:34:23,224 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 14 states. [2020-07-20 13:34:23,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:23,434 INFO L93 Difference]: Finished difference Result 61 states and 96 transitions. [2020-07-20 13:34:23,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:34:23,434 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 52 [2020-07-20 13:34:23,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:23,437 INFO L225 Difference]: With dead ends: 61 [2020-07-20 13:34:23,437 INFO L226 Difference]: Without dead ends: 57 [2020-07-20 13:34:23,438 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 86 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 13:34:23,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-20 13:34:23,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2020-07-20 13:34:23,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 13:34:23,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 13:34:23,450 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 52 [2020-07-20 13:34:23,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:23,451 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 13:34:23,451 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 13:34:23,451 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 13:34:23,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-20 13:34:23,453 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:23,453 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:23,661 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:23,662 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:23,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:23,663 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-20 13:34:23,664 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:23,664 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [795579955] [2020-07-20 13:34:23,665 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:23,706 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:23,706 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:23,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 13:34:23,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:23,788 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-07-20 13:34:23,788 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:24,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:24,158 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:24,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:24,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:24,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:24,353 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-20 13:34:24,354 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [795579955] [2020-07-20 13:34:24,355 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:24,355 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-20 13:34:24,355 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166829352] [2020-07-20 13:34:24,356 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 13:34:24,356 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:24,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 13:34:24,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-20 13:34:24,357 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 14 states. [2020-07-20 13:34:24,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:24,556 INFO L93 Difference]: Finished difference Result 66 states and 110 transitions. [2020-07-20 13:34:24,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 13:34:24,557 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 54 [2020-07-20 13:34:24,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:24,560 INFO L225 Difference]: With dead ends: 66 [2020-07-20 13:34:24,560 INFO L226 Difference]: Without dead ends: 62 [2020-07-20 13:34:24,561 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 90 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-20 13:34:24,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-20 13:34:24,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 45. [2020-07-20 13:34:24,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-20 13:34:24,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-20 13:34:24,573 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 54 [2020-07-20 13:34:24,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:24,574 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-20 13:34:24,574 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 13:34:24,574 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-20 13:34:24,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-20 13:34:24,576 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:24,576 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:24,791 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:24,793 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:24,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:24,793 INFO L82 PathProgramCache]: Analyzing trace with hash -975547772, now seen corresponding path program 3 times [2020-07-20 13:34:24,794 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:24,794 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1802528695] [2020-07-20 13:34:24,795 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:24,852 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:24,852 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:24,853 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:34:24,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:24,936 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 60 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-20 13:34:24,937 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:25,544 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:25,546 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:25,698 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:25,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:25,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:25,828 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:25,830 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:25,877 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 68 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2020-07-20 13:34:25,878 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1802528695] [2020-07-20 13:34:25,878 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:25,878 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 13:34:25,879 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083526924] [2020-07-20 13:34:25,879 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 13:34:25,879 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:25,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 13:34:25,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 13:34:25,880 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 16 states. [2020-07-20 13:34:26,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:26,123 INFO L93 Difference]: Finished difference Result 71 states and 124 transitions. [2020-07-20 13:34:26,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:34:26,124 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 78 [2020-07-20 13:34:26,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:26,126 INFO L225 Difference]: With dead ends: 71 [2020-07-20 13:34:26,126 INFO L226 Difference]: Without dead ends: 67 [2020-07-20 13:34:26,128 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 134 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:34:26,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-20 13:34:26,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 50. [2020-07-20 13:34:26,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 13:34:26,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-20 13:34:26,141 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 78 [2020-07-20 13:34:26,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:26,142 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-20 13:34:26,142 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 13:34:26,142 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-20 13:34:26,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-20 13:34:26,145 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:26,145 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:26,358 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:26,359 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:26,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:26,360 INFO L82 PathProgramCache]: Analyzing trace with hash 1891337214, now seen corresponding path program 2 times [2020-07-20 13:34:26,360 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:26,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1721557892] [2020-07-20 13:34:26,361 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:26,430 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:26,430 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:26,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 13:34:26,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:26,529 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 115 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-07-20 13:34:26,530 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:27,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:27,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:27,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:27,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:27,457 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 125 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-07-20 13:34:27,458 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1721557892] [2020-07-20 13:34:27,458 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:27,458 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-20 13:34:27,458 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1998335717] [2020-07-20 13:34:27,461 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 13:34:27,461 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:27,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 13:34:27,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-20 13:34:27,462 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 16 states. [2020-07-20 13:34:27,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:27,757 INFO L93 Difference]: Finished difference Result 76 states and 140 transitions. [2020-07-20 13:34:27,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 13:34:27,757 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 108 [2020-07-20 13:34:27,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:27,759 INFO L225 Difference]: With dead ends: 76 [2020-07-20 13:34:27,760 INFO L226 Difference]: Without dead ends: 72 [2020-07-20 13:34:27,762 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 192 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-20 13:34:27,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-20 13:34:27,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 50. [2020-07-20 13:34:27,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-20 13:34:27,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-20 13:34:27,795 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 108 [2020-07-20 13:34:27,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:27,796 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-20 13:34:27,796 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 13:34:27,797 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-20 13:34:27,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2020-07-20 13:34:27,801 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:27,801 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 13, 13, 12, 9, 9, 9, 9, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:28,017 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:28,018 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:28,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:28,019 INFO L82 PathProgramCache]: Analyzing trace with hash -815433282, now seen corresponding path program 4 times [2020-07-20 13:34:28,020 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:28,020 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1711299519] [2020-07-20 13:34:28,021 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:28,122 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:28,122 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:28,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:34:28,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:28,234 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 332 refuted. 0 times theorem prover too weak. 800 trivial. 0 not checked. [2020-07-20 13:34:28,234 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:29,295 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:29,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:29,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:29,717 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:29,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:29,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:29,854 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:29,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:29,916 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 346 refuted. 0 times theorem prover too weak. 786 trivial. 0 not checked. [2020-07-20 13:34:29,917 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1711299519] [2020-07-20 13:34:29,917 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:29,918 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 13:34:29,918 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919437193] [2020-07-20 13:34:29,919 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 13:34:29,919 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:29,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 13:34:29,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 13:34:29,920 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 18 states. [2020-07-20 13:34:30,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:30,229 INFO L93 Difference]: Finished difference Result 81 states and 156 transitions. [2020-07-20 13:34:30,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:34:30,230 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 208 [2020-07-20 13:34:30,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:30,234 INFO L225 Difference]: With dead ends: 81 [2020-07-20 13:34:30,234 INFO L226 Difference]: Without dead ends: 77 [2020-07-20 13:34:30,235 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 389 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:34:30,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-07-20 13:34:30,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 55. [2020-07-20 13:34:30,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-20 13:34:30,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-20 13:34:30,247 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 208 [2020-07-20 13:34:30,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:30,248 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-20 13:34:30,248 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 13:34:30,248 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-20 13:34:30,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-20 13:34:30,250 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:30,251 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:30,465 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:30,466 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:30,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:30,467 INFO L82 PathProgramCache]: Analyzing trace with hash 1180347891, now seen corresponding path program 2 times [2020-07-20 13:34:30,467 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:30,468 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1340216645] [2020-07-20 13:34:30,468 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:30,551 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:30,551 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:30,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 13:34:30,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:30,635 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 24 proven. 149 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2020-07-20 13:34:30,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:31,491 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:31,734 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:31,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:31,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:31,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:31,969 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:32,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:32,086 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 24 proven. 165 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2020-07-20 13:34:32,087 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1340216645] [2020-07-20 13:34:32,088 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:32,088 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-20 13:34:32,089 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428628730] [2020-07-20 13:34:32,090 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 13:34:32,090 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:32,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 13:34:32,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-20 13:34:32,091 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 18 states. [2020-07-20 13:34:32,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:32,392 INFO L93 Difference]: Finished difference Result 86 states and 174 transitions. [2020-07-20 13:34:32,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 13:34:32,392 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 121 [2020-07-20 13:34:32,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:32,395 INFO L225 Difference]: With dead ends: 86 [2020-07-20 13:34:32,395 INFO L226 Difference]: Without dead ends: 82 [2020-07-20 13:34:32,396 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 214 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:34:32,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-07-20 13:34:32,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 55. [2020-07-20 13:34:32,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-20 13:34:32,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-20 13:34:32,408 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 121 [2020-07-20 13:34:32,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:32,408 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-20 13:34:32,408 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 13:34:32,409 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-20 13:34:32,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2020-07-20 13:34:32,411 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:32,412 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 11, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:32,625 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:32,625 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:32,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:32,626 INFO L82 PathProgramCache]: Analyzing trace with hash 2099307065, now seen corresponding path program 5 times [2020-07-20 13:34:32,627 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:32,627 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1040325109] [2020-07-20 13:34:32,628 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:32,754 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:32,755 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:32,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:34:32,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:32,883 INFO L134 CoverageAnalysis]: Checked inductivity of 1023 backedges. 62 proven. 331 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2020-07-20 13:34:32,883 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:34,225 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:34,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:34,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:34,911 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:34,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:35,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:35,066 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:35,160 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:35,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:35,211 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:35,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:35,269 INFO L134 CoverageAnalysis]: Checked inductivity of 1023 backedges. 62 proven. 352 refuted. 0 times theorem prover too weak. 609 trivial. 0 not checked. [2020-07-20 13:34:35,270 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1040325109] [2020-07-20 13:34:35,270 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:35,270 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 13:34:35,271 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [242393479] [2020-07-20 13:34:35,271 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 13:34:35,272 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:35,272 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 13:34:35,272 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:34:35,272 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 20 states. [2020-07-20 13:34:35,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:35,678 INFO L93 Difference]: Finished difference Result 91 states and 192 transitions. [2020-07-20 13:34:35,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:34:35,679 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 195 [2020-07-20 13:34:35,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:35,682 INFO L225 Difference]: With dead ends: 91 [2020-07-20 13:34:35,682 INFO L226 Difference]: Without dead ends: 87 [2020-07-20 13:34:35,683 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 359 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 13:34:35,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-07-20 13:34:35,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 60. [2020-07-20 13:34:35,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 13:34:35,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 100 transitions. [2020-07-20 13:34:35,696 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 100 transitions. Word has length 195 [2020-07-20 13:34:35,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:35,697 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 100 transitions. [2020-07-20 13:34:35,697 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 13:34:35,697 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 100 transitions. [2020-07-20 13:34:35,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-07-20 13:34:35,700 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:35,700 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 12, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:35,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:35,914 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:35,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:35,915 INFO L82 PathProgramCache]: Analyzing trace with hash 266210309, now seen corresponding path program 3 times [2020-07-20 13:34:35,916 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:35,917 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [111768414] [2020-07-20 13:34:35,917 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:36,047 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:36,048 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:36,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 370 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 13:34:36,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:36,216 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 69 proven. 347 refuted. 0 times theorem prover too weak. 658 trivial. 0 not checked. [2020-07-20 13:34:36,216 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:37,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:38,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:38,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:38,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:38,463 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:38,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:38,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:38,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:38,667 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 69 proven. 371 refuted. 0 times theorem prover too weak. 634 trivial. 0 not checked. [2020-07-20 13:34:38,668 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [111768414] [2020-07-20 13:34:38,668 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:38,668 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-20 13:34:38,668 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088888347] [2020-07-20 13:34:38,669 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 13:34:38,669 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:38,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 13:34:38,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-20 13:34:38,670 INFO L87 Difference]: Start difference. First operand 60 states and 100 transitions. Second operand 20 states. [2020-07-20 13:34:39,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:39,030 INFO L93 Difference]: Finished difference Result 96 states and 212 transitions. [2020-07-20 13:34:39,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 13:34:39,031 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 201 [2020-07-20 13:34:39,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:39,037 INFO L225 Difference]: With dead ends: 96 [2020-07-20 13:34:39,037 INFO L226 Difference]: Without dead ends: 92 [2020-07-20 13:34:39,039 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 370 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-20 13:34:39,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-07-20 13:34:39,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 60. [2020-07-20 13:34:39,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 13:34:39,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 100 transitions. [2020-07-20 13:34:39,058 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 100 transitions. Word has length 201 [2020-07-20 13:34:39,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:39,060 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 100 transitions. [2020-07-20 13:34:39,060 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 13:34:39,060 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 100 transitions. [2020-07-20 13:34:39,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 352 [2020-07-20 13:34:39,070 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:39,070 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 22, 21, 21, 16, 16, 16, 16, 16, 16, 16, 16, 10, 10, 10, 10, 10, 10, 10, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:39,285 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:39,285 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:39,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:39,286 INFO L82 PathProgramCache]: Analyzing trace with hash -865443995, now seen corresponding path program 6 times [2020-07-20 13:34:39,286 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:39,286 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1846165842] [2020-07-20 13:34:39,286 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:39,478 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:39,478 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:39,481 INFO L263 TraceCheckSpWp]: Trace formula consists of 641 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:34:39,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:39,678 INFO L134 CoverageAnalysis]: Checked inductivity of 3649 backedges. 117 proven. 819 refuted. 0 times theorem prover too weak. 2713 trivial. 0 not checked. [2020-07-20 13:34:39,679 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:41,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:41,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:42,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:42,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:42,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:42,798 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:43,028 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:43,030 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:43,201 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:43,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:43,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:43,501 INFO L134 CoverageAnalysis]: Checked inductivity of 3649 backedges. 117 proven. 849 refuted. 0 times theorem prover too weak. 2683 trivial. 0 not checked. [2020-07-20 13:34:43,502 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1846165842] [2020-07-20 13:34:43,502 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:43,502 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-20 13:34:43,503 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1941924417] [2020-07-20 13:34:43,503 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 13:34:43,504 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:43,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 13:34:43,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-20 13:34:43,504 INFO L87 Difference]: Start difference. First operand 60 states and 100 transitions. Second operand 22 states. [2020-07-20 13:34:43,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:43,982 INFO L93 Difference]: Finished difference Result 101 states and 232 transitions. [2020-07-20 13:34:43,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:34:43,983 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 351 [2020-07-20 13:34:43,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:43,989 INFO L225 Difference]: With dead ends: 101 [2020-07-20 13:34:43,990 INFO L226 Difference]: Without dead ends: 97 [2020-07-20 13:34:43,991 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 711 GetRequests, 667 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-20 13:34:43,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-07-20 13:34:44,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 65. [2020-07-20 13:34:44,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-20 13:34:44,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 114 transitions. [2020-07-20 13:34:44,017 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 114 transitions. Word has length 351 [2020-07-20 13:34:44,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:44,018 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 114 transitions. [2020-07-20 13:34:44,018 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 13:34:44,018 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 114 transitions. [2020-07-20 13:34:44,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 338 [2020-07-20 13:34:44,023 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:44,023 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 22, 21, 21, 14, 14, 14, 14, 14, 14, 14, 14, 12, 10, 10, 10, 10, 10, 10, 10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:44,237 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:44,238 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:44,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:44,239 INFO L82 PathProgramCache]: Analyzing trace with hash 1413996641, now seen corresponding path program 3 times [2020-07-20 13:34:44,239 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:44,239 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [500418159] [2020-07-20 13:34:44,240 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:44,521 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:44,522 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:44,525 INFO L263 TraceCheckSpWp]: Trace formula consists of 616 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 13:34:44,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:44,748 INFO L134 CoverageAnalysis]: Checked inductivity of 3218 backedges. 137 proven. 762 refuted. 0 times theorem prover too weak. 2319 trivial. 0 not checked. [2020-07-20 13:34:44,749 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:46,856 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:46,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:47,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:48,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:48,333 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:48,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:48,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:48,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:48,627 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:48,749 INFO L134 CoverageAnalysis]: Checked inductivity of 3218 backedges. 137 proven. 795 refuted. 0 times theorem prover too weak. 2286 trivial. 0 not checked. [2020-07-20 13:34:48,750 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [500418159] [2020-07-20 13:34:48,750 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:48,750 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-20 13:34:48,751 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2027951126] [2020-07-20 13:34:48,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 13:34:48,752 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:48,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 13:34:48,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-20 13:34:48,753 INFO L87 Difference]: Start difference. First operand 65 states and 114 transitions. Second operand 22 states. [2020-07-20 13:34:49,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:49,239 INFO L93 Difference]: Finished difference Result 106 states and 254 transitions. [2020-07-20 13:34:49,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 13:34:49,240 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 337 [2020-07-20 13:34:49,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:49,244 INFO L225 Difference]: With dead ends: 106 [2020-07-20 13:34:49,244 INFO L226 Difference]: Without dead ends: 102 [2020-07-20 13:34:49,247 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 682 GetRequests, 638 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-20 13:34:49,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-07-20 13:34:49,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 65. [2020-07-20 13:34:49,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-20 13:34:49,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 114 transitions. [2020-07-20 13:34:49,265 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 114 transitions. Word has length 337 [2020-07-20 13:34:49,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:49,268 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 114 transitions. [2020-07-20 13:34:49,268 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 13:34:49,268 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 114 transitions. [2020-07-20 13:34:49,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 820 [2020-07-20 13:34:49,278 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:49,278 INFO L422 BasicCegarLoop]: trace histogram [73, 73, 52, 52, 47, 36, 36, 36, 36, 36, 36, 36, 36, 26, 26, 26, 26, 26, 26, 26, 26, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:49,493 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:49,494 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:49,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:49,495 INFO L82 PathProgramCache]: Analyzing trace with hash -1230346157, now seen corresponding path program 7 times [2020-07-20 13:34:49,496 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:49,496 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [786855097] [2020-07-20 13:34:49,496 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:49,866 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:49,867 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:49,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 1490 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:34:49,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:50,497 INFO L134 CoverageAnalysis]: Checked inductivity of 20591 backedges. 373 proven. 2371 refuted. 0 times theorem prover too weak. 17847 trivial. 0 not checked. [2020-07-20 13:34:50,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:34:54,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:55,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:56,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:56,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:56,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:56,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:56,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:56,995 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:57,153 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:57,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:57,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:57,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:34:57,710 INFO L134 CoverageAnalysis]: Checked inductivity of 20591 backedges. 373 proven. 2411 refuted. 0 times theorem prover too weak. 17807 trivial. 0 not checked. [2020-07-20 13:34:57,710 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [786855097] [2020-07-20 13:34:57,711 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:34:57,711 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 24 [2020-07-20 13:34:57,711 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964051515] [2020-07-20 13:34:57,713 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 13:34:57,713 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:34:57,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 13:34:57,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:34:57,714 INFO L87 Difference]: Start difference. First operand 65 states and 114 transitions. Second operand 24 states. [2020-07-20 13:34:58,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:34:58,282 INFO L93 Difference]: Finished difference Result 111 states and 276 transitions. [2020-07-20 13:34:58,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:34:58,283 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 819 [2020-07-20 13:34:58,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:34:58,288 INFO L225 Difference]: With dead ends: 111 [2020-07-20 13:34:58,288 INFO L226 Difference]: Without dead ends: 107 [2020-07-20 13:34:58,289 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1648 GetRequests, 1599 SyntacticMatches, 18 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=205, Invalid=851, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 13:34:58,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-07-20 13:34:58,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 70. [2020-07-20 13:34:58,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-20 13:34:58,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 129 transitions. [2020-07-20 13:34:58,302 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 129 transitions. Word has length 819 [2020-07-20 13:34:58,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:34:58,303 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 129 transitions. [2020-07-20 13:34:58,303 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 13:34:58,303 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 129 transitions. [2020-07-20 13:34:58,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 419 [2020-07-20 13:34:58,307 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:34:58,307 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 27, 24, 24, 18, 18, 18, 18, 18, 18, 18, 18, 15, 12, 12, 12, 12, 12, 12, 12, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:34:58,520 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:58,521 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:34:58,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:34:58,521 INFO L82 PathProgramCache]: Analyzing trace with hash 2047786411, now seen corresponding path program 4 times [2020-07-20 13:34:58,522 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:34:58,522 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [544167435] [2020-07-20 13:34:58,522 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:34:58,818 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:34:58,819 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:34:58,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 761 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 13:34:58,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:34:59,080 INFO L134 CoverageAnalysis]: Checked inductivity of 5148 backedges. 188 proven. 1118 refuted. 0 times theorem prover too weak. 3842 trivial. 0 not checked. [2020-07-20 13:34:59,080 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:01,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:02,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:02,647 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:03,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:03,797 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:04,070 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:04,235 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:04,236 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:04,349 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:04,350 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:04,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:04,633 INFO L134 CoverageAnalysis]: Checked inductivity of 5148 backedges. 188 proven. 1162 refuted. 0 times theorem prover too weak. 3798 trivial. 0 not checked. [2020-07-20 13:35:04,634 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [544167435] [2020-07-20 13:35:04,634 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:04,634 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 24 [2020-07-20 13:35:04,638 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232874319] [2020-07-20 13:35:04,656 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 13:35:04,656 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:04,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 13:35:04,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2020-07-20 13:35:04,657 INFO L87 Difference]: Start difference. First operand 70 states and 129 transitions. Second operand 24 states. [2020-07-20 13:35:05,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:05,206 INFO L93 Difference]: Finished difference Result 116 states and 300 transitions. [2020-07-20 13:35:05,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 13:35:05,207 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 418 [2020-07-20 13:35:05,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:05,211 INFO L225 Difference]: With dead ends: 116 [2020-07-20 13:35:05,211 INFO L226 Difference]: Without dead ends: 112 [2020-07-20 13:35:05,213 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 845 GetRequests, 796 SyntacticMatches, 18 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=205, Invalid=851, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 13:35:05,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-07-20 13:35:05,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 70. [2020-07-20 13:35:05,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-20 13:35:05,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 129 transitions. [2020-07-20 13:35:05,229 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 129 transitions. Word has length 418 [2020-07-20 13:35:05,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:05,230 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 129 transitions. [2020-07-20 13:35:05,230 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 13:35:05,230 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 129 transitions. [2020-07-20 13:35:05,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 742 [2020-07-20 13:35:05,238 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:05,238 INFO L422 BasicCegarLoop]: trace histogram [68, 68, 46, 45, 45, 34, 34, 34, 34, 34, 34, 34, 34, 22, 22, 22, 22, 22, 22, 22, 22, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:05,453 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:05,454 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:05,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:05,455 INFO L82 PathProgramCache]: Analyzing trace with hash 1563866591, now seen corresponding path program 8 times [2020-07-20 13:35:05,455 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:05,455 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2134680859] [2020-07-20 13:35:05,456 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:05,866 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:05,867 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:05,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 1353 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 13:35:05,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:06,302 INFO L134 CoverageAnalysis]: Checked inductivity of 17032 backedges. 395 proven. 2323 refuted. 0 times theorem prover too weak. 14314 trivial. 0 not checked. [2020-07-20 13:35:06,302 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:10,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:10,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:11,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:11,832 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:13,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:14,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:14,048 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:14,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:14,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:14,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:14,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:15,057 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:15,058 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:15,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:15,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:15,438 INFO L134 CoverageAnalysis]: Checked inductivity of 17032 backedges. 395 proven. 2375 refuted. 0 times theorem prover too weak. 14262 trivial. 0 not checked. [2020-07-20 13:35:15,438 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2134680859] [2020-07-20 13:35:15,439 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:15,439 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 26 [2020-07-20 13:35:15,440 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637319615] [2020-07-20 13:35:15,442 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 13:35:15,443 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:15,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 13:35:15,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=540, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:35:15,444 INFO L87 Difference]: Start difference. First operand 70 states and 129 transitions. Second operand 26 states. [2020-07-20 13:35:16,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:16,109 INFO L93 Difference]: Finished difference Result 121 states and 324 transitions. [2020-07-20 13:35:16,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 13:35:16,111 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 741 [2020-07-20 13:35:16,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:16,116 INFO L225 Difference]: With dead ends: 121 [2020-07-20 13:35:16,116 INFO L226 Difference]: Without dead ends: 117 [2020-07-20 13:35:16,118 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1493 GetRequests, 1439 SyntacticMatches, 20 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 307 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=240, Invalid=1020, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 13:35:16,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2020-07-20 13:35:16,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 75. [2020-07-20 13:35:16,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-07-20 13:35:16,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 145 transitions. [2020-07-20 13:35:16,131 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 145 transitions. Word has length 741 [2020-07-20 13:35:16,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:16,132 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 145 transitions. [2020-07-20 13:35:16,132 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 13:35:16,133 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 145 transitions. [2020-07-20 13:35:16,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 872 [2020-07-20 13:35:16,143 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:16,144 INFO L422 BasicCegarLoop]: trace histogram [74, 74, 55, 55, 53, 37, 37, 37, 37, 37, 37, 37, 37, 27, 27, 27, 27, 27, 27, 27, 26, 21, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:16,357 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:16,358 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:16,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:16,359 INFO L82 PathProgramCache]: Analyzing trace with hash 2100501163, now seen corresponding path program 4 times [2020-07-20 13:35:16,360 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:16,360 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [557484918] [2020-07-20 13:35:16,360 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:16,849 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:16,849 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:16,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 1579 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 13:35:16,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:17,406 INFO L134 CoverageAnalysis]: Checked inductivity of 22856 backedges. 460 proven. 2821 refuted. 0 times theorem prover too weak. 19575 trivial. 0 not checked. [2020-07-20 13:35:17,406 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:21,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:21,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:23,647 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:24,739 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:24,740 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:25,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:26,129 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:26,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:26,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:26,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:26,711 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:26,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:27,170 INFO L134 CoverageAnalysis]: Checked inductivity of 22856 backedges. 460 proven. 2877 refuted. 0 times theorem prover too weak. 19519 trivial. 0 not checked. [2020-07-20 13:35:27,171 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [557484918] [2020-07-20 13:35:27,171 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:27,171 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 26 [2020-07-20 13:35:27,171 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1994932416] [2020-07-20 13:35:27,172 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 13:35:27,172 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:27,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 13:35:27,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=540, Unknown=0, NotChecked=0, Total=650 [2020-07-20 13:35:27,173 INFO L87 Difference]: Start difference. First operand 75 states and 145 transitions. Second operand 26 states. [2020-07-20 13:35:27,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:27,807 INFO L93 Difference]: Finished difference Result 126 states and 350 transitions. [2020-07-20 13:35:27,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 13:35:27,808 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 871 [2020-07-20 13:35:27,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:27,812 INFO L225 Difference]: With dead ends: 126 [2020-07-20 13:35:27,812 INFO L226 Difference]: Without dead ends: 122 [2020-07-20 13:35:27,813 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1752 GetRequests, 1698 SyntacticMatches, 20 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 307 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=240, Invalid=1020, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 13:35:27,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-07-20 13:35:27,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 75. [2020-07-20 13:35:27,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-07-20 13:35:27,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 145 transitions. [2020-07-20 13:35:27,825 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 145 transitions. Word has length 871 [2020-07-20 13:35:27,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:27,826 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 145 transitions. [2020-07-20 13:35:27,826 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 13:35:27,827 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 145 transitions. [2020-07-20 13:35:27,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1691 [2020-07-20 13:35:27,851 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:27,853 INFO L422 BasicCegarLoop]: trace histogram [149, 149, 110, 110, 94, 74, 74, 74, 74, 74, 74, 74, 74, 55, 55, 55, 55, 55, 55, 55, 55, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:28,065 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:28,066 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:28,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:28,067 INFO L82 PathProgramCache]: Analyzing trace with hash -1326645612, now seen corresponding path program 9 times [2020-07-20 13:35:28,067 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:28,067 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [8978313] [2020-07-20 13:35:28,067 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:28,862 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:28,862 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:28,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 3072 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 13:35:28,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:30,392 INFO L134 CoverageAnalysis]: Checked inductivity of 89014 backedges. 842 proven. 6392 refuted. 0 times theorem prover too weak. 81780 trivial. 0 not checked. [2020-07-20 13:35:30,392 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:39,012 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:39,013 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:41,617 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:43,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:44,414 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:45,330 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:45,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:45,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:46,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:46,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:46,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:46,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:46,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:46,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:47,823 INFO L134 CoverageAnalysis]: Checked inductivity of 89014 backedges. 842 proven. 6457 refuted. 0 times theorem prover too weak. 81715 trivial. 0 not checked. [2020-07-20 13:35:47,823 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [8978313] [2020-07-20 13:35:47,823 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:35:47,824 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 25] total 28 [2020-07-20 13:35:47,824 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404138962] [2020-07-20 13:35:47,825 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-20 13:35:47,825 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:35:47,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-20 13:35:47,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=630, Unknown=0, NotChecked=0, Total=756 [2020-07-20 13:35:47,826 INFO L87 Difference]: Start difference. First operand 75 states and 145 transitions. Second operand 28 states. [2020-07-20 13:35:48,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:35:48,624 INFO L93 Difference]: Finished difference Result 131 states and 376 transitions. [2020-07-20 13:35:48,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 13:35:48,625 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 1690 [2020-07-20 13:35:48,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:35:48,630 INFO L225 Difference]: With dead ends: 131 [2020-07-20 13:35:48,630 INFO L226 Difference]: Without dead ends: 127 [2020-07-20 13:35:48,632 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3392 GetRequests, 3333 SyntacticMatches, 22 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 376 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=281, Invalid=1201, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 13:35:48,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2020-07-20 13:35:48,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 80. [2020-07-20 13:35:48,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-20 13:35:48,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 162 transitions. [2020-07-20 13:35:48,645 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 162 transitions. Word has length 1690 [2020-07-20 13:35:48,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:35:48,647 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 162 transitions. [2020-07-20 13:35:48,647 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-20 13:35:48,647 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 162 transitions. [2020-07-20 13:35:48,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1433 [2020-07-20 13:35:48,667 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:35:48,668 INFO L422 BasicCegarLoop]: trace histogram [121, 121, 92, 92, 87, 60, 60, 60, 60, 60, 60, 60, 60, 46, 46, 46, 46, 46, 46, 46, 41, 34, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:35:48,883 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:48,884 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:35:48,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:35:48,885 INFO L82 PathProgramCache]: Analyzing trace with hash -37703149, now seen corresponding path program 5 times [2020-07-20 13:35:48,886 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:35:48,886 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1915539188] [2020-07-20 13:35:48,886 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:35:49,602 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:35:49,602 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:35:49,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 2591 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 13:35:49,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:35:50,741 INFO L134 CoverageAnalysis]: Checked inductivity of 62515 backedges. 847 proven. 5319 refuted. 0 times theorem prover too weak. 56349 trivial. 0 not checked. [2020-07-20 13:35:50,741 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:35:57,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:35:57,544 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:00,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:00,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:02,079 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:02,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:03,290 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:04,430 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:04,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:05,374 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:05,375 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:05,565 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:05,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:05,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:06,746 INFO L134 CoverageAnalysis]: Checked inductivity of 62515 backedges. 847 proven. 5389 refuted. 0 times theorem prover too weak. 56279 trivial. 0 not checked. [2020-07-20 13:36:06,747 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1915539188] [2020-07-20 13:36:06,747 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:06,747 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 25] total 28 [2020-07-20 13:36:06,748 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900086775] [2020-07-20 13:36:06,749 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-20 13:36:06,749 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:06,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-20 13:36:06,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=630, Unknown=0, NotChecked=0, Total=756 [2020-07-20 13:36:06,751 INFO L87 Difference]: Start difference. First operand 80 states and 162 transitions. Second operand 28 states. [2020-07-20 13:36:07,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:07,524 INFO L93 Difference]: Finished difference Result 136 states and 404 transitions. [2020-07-20 13:36:07,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 13:36:07,527 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 1432 [2020-07-20 13:36:07,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:07,531 INFO L225 Difference]: With dead ends: 136 [2020-07-20 13:36:07,531 INFO L226 Difference]: Without dead ends: 132 [2020-07-20 13:36:07,533 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2875 GetRequests, 2816 SyntacticMatches, 22 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 376 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=281, Invalid=1201, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 13:36:07,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2020-07-20 13:36:07,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 80. [2020-07-20 13:36:07,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-20 13:36:07,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 162 transitions. [2020-07-20 13:36:07,550 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 162 transitions. Word has length 1432 [2020-07-20 13:36:07,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:07,551 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 162 transitions. [2020-07-20 13:36:07,551 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-20 13:36:07,551 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 162 transitions. [2020-07-20 13:36:07,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1990 [2020-07-20 13:36:07,592 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:07,593 INFO L422 BasicCegarLoop]: trace histogram [176, 176, 129, 129, 112, 88, 88, 88, 88, 88, 88, 88, 88, 64, 64, 64, 64, 64, 64, 64, 64, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:07,805 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:07,806 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:07,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:07,808 INFO L82 PathProgramCache]: Analyzing trace with hash 1412849447, now seen corresponding path program 10 times [2020-07-20 13:36:07,808 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:07,808 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1659050034] [2020-07-20 13:36:07,809 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:08,762 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:36:08,763 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:08,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 3615 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 13:36:08,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:11,106 INFO L134 CoverageAnalysis]: Checked inductivity of 123844 backedges. 1207 proven. 8137 refuted. 0 times theorem prover too weak. 114500 trivial. 0 not checked. [2020-07-20 13:36:11,106 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:21,446 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:21,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:24,133 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 13:36:25,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:28,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:28,367 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:31,275 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:32,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:33,729 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:33,730 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:34,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:34,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:34,698 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:34,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:34,907 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:35,042 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:35,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:36,749 INFO L134 CoverageAnalysis]: Checked inductivity of 123844 backedges. 1207 proven. 8217 refuted. 0 times theorem prover too weak. 114420 trivial. 0 not checked. [2020-07-20 13:36:36,750 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1659050034] [2020-07-20 13:36:36,750 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:36:36,751 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 27] total 30 [2020-07-20 13:36:36,751 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [587394783] [2020-07-20 13:36:36,753 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-20 13:36:36,753 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:36:36,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-20 13:36:36,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=728, Unknown=0, NotChecked=0, Total=870 [2020-07-20 13:36:36,755 INFO L87 Difference]: Start difference. First operand 80 states and 162 transitions. Second operand 30 states. [2020-07-20 13:36:37,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:36:37,959 INFO L93 Difference]: Finished difference Result 141 states and 432 transitions. [2020-07-20 13:36:37,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 13:36:37,960 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 1989 [2020-07-20 13:36:37,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:36:37,965 INFO L225 Difference]: With dead ends: 141 [2020-07-20 13:36:37,965 INFO L226 Difference]: Without dead ends: 137 [2020-07-20 13:36:37,967 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3991 GetRequests, 3927 SyntacticMatches, 24 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 452 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=322, Invalid=1400, Unknown=0, NotChecked=0, Total=1722 [2020-07-20 13:36:37,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2020-07-20 13:36:37,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 85. [2020-07-20 13:36:37,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-07-20 13:36:37,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 180 transitions. [2020-07-20 13:36:37,983 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 180 transitions. Word has length 1989 [2020-07-20 13:36:37,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:36:37,985 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 180 transitions. [2020-07-20 13:36:37,985 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-20 13:36:37,985 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 180 transitions. [2020-07-20 13:36:38,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2050 [2020-07-20 13:36:38,028 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:36:38,030 INFO L422 BasicCegarLoop]: trace histogram [176, 176, 129, 129, 124, 88, 88, 88, 88, 88, 88, 88, 88, 64, 64, 64, 64, 64, 64, 64, 60, 52, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:36:38,242 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:38,243 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:36:38,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:36:38,244 INFO L82 PathProgramCache]: Analyzing trace with hash 266934567, now seen corresponding path program 5 times [2020-07-20 13:36:38,245 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:36:38,245 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [225658725] [2020-07-20 13:36:38,245 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:36:39,425 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:36:39,426 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:36:39,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 3712 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 13:36:39,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:36:41,318 INFO L134 CoverageAnalysis]: Checked inductivity of 129454 backedges. 1251 proven. 8506 refuted. 0 times theorem prover too weak. 119697 trivial. 0 not checked. [2020-07-20 13:36:41,319 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:36:52,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:52,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:36:56,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:01,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:01,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:03,961 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:05,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:05,861 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:06,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:07,395 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:07,864 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:07,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:08,104 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:08,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:08,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:10,034 INFO L134 CoverageAnalysis]: Checked inductivity of 129454 backedges. 1251 proven. 8591 refuted. 0 times theorem prover too weak. 119612 trivial. 0 not checked. [2020-07-20 13:37:10,035 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [225658725] [2020-07-20 13:37:10,035 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:37:10,036 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 27] total 30 [2020-07-20 13:37:10,036 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347112181] [2020-07-20 13:37:10,037 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-20 13:37:10,037 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:37:10,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-20 13:37:10,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=728, Unknown=0, NotChecked=0, Total=870 [2020-07-20 13:37:10,038 INFO L87 Difference]: Start difference. First operand 85 states and 180 transitions. Second operand 30 states. [2020-07-20 13:37:11,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:37:11,287 INFO L93 Difference]: Finished difference Result 146 states and 462 transitions. [2020-07-20 13:37:11,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 13:37:11,289 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 2049 [2020-07-20 13:37:11,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:37:11,294 INFO L225 Difference]: With dead ends: 146 [2020-07-20 13:37:11,294 INFO L226 Difference]: Without dead ends: 142 [2020-07-20 13:37:11,296 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4110 GetRequests, 4046 SyntacticMatches, 24 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 452 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=322, Invalid=1400, Unknown=0, NotChecked=0, Total=1722 [2020-07-20 13:37:11,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2020-07-20 13:37:11,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 85. [2020-07-20 13:37:11,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-07-20 13:37:11,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 180 transitions. [2020-07-20 13:37:11,314 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 180 transitions. Word has length 2049 [2020-07-20 13:37:11,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:37:11,315 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 180 transitions. [2020-07-20 13:37:11,315 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-20 13:37:11,315 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 180 transitions. [2020-07-20 13:37:11,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3680 [2020-07-20 13:37:11,411 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:37:11,413 INFO L422 BasicCegarLoop]: trace histogram [329, 329, 236, 236, 211, 164, 164, 164, 164, 164, 164, 164, 164, 118, 118, 118, 118, 118, 118, 118, 118, 72, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:37:11,613 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:11,614 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:37:11,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:37:11,616 INFO L82 PathProgramCache]: Analyzing trace with hash -886096047, now seen corresponding path program 11 times [2020-07-20 13:37:11,616 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:37:11,616 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1541921516] [2020-07-20 13:37:11,617 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:37:13,176 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:37:13,176 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:37:13,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 6678 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 13:37:13,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:37:19,066 INFO L134 CoverageAnalysis]: Checked inductivity of 428089 backedges. 2394 proven. 16770 refuted. 0 times theorem prover too weak. 408925 trivial. 0 not checked. [2020-07-20 13:37:19,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:37:24,752 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 13:37:40,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:48,333 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:53,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:37:53,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:00,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:03,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:03,944 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:05,625 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:06,984 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:06,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:07,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:08,177 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:08,462 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:08,642 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:08,756 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:13,835 INFO L134 CoverageAnalysis]: Checked inductivity of 428089 backedges. 2394 proven. 16866 refuted. 0 times theorem prover too weak. 408829 trivial. 0 not checked. [2020-07-20 13:38:13,836 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1541921516] [2020-07-20 13:38:13,836 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:38:13,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 29] total 32 [2020-07-20 13:38:13,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296057148] [2020-07-20 13:38:13,841 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-20 13:38:13,842 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:38:13,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-20 13:38:13,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=832, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:38:13,843 INFO L87 Difference]: Start difference. First operand 85 states and 180 transitions. Second operand 32 states. [2020-07-20 13:38:15,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:38:15,505 INFO L93 Difference]: Finished difference Result 151 states and 492 transitions. [2020-07-20 13:38:15,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 13:38:15,509 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 3679 [2020-07-20 13:38:15,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:38:15,516 INFO L225 Difference]: With dead ends: 151 [2020-07-20 13:38:15,516 INFO L226 Difference]: Without dead ends: 147 [2020-07-20 13:38:15,518 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7372 GetRequests, 7303 SyntacticMatches, 26 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 535 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=369, Invalid=1611, Unknown=0, NotChecked=0, Total=1980 [2020-07-20 13:38:15,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2020-07-20 13:38:15,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 90. [2020-07-20 13:38:15,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-07-20 13:38:15,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 199 transitions. [2020-07-20 13:38:15,537 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 199 transitions. Word has length 3679 [2020-07-20 13:38:15,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:38:15,540 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 199 transitions. [2020-07-20 13:38:15,540 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-20 13:38:15,540 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 199 transitions. [2020-07-20 13:38:15,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3365 [2020-07-20 13:38:15,628 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:38:15,629 INFO L422 BasicCegarLoop]: trace histogram [287, 287, 214, 214, 208, 143, 143, 143, 143, 143, 143, 143, 143, 107, 107, 107, 107, 107, 107, 107, 101, 79, 71, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:38:15,829 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:15,830 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:38:15,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:38:15,832 INFO L82 PathProgramCache]: Analyzing trace with hash 147049693, now seen corresponding path program 6 times [2020-07-20 13:38:15,833 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:38:15,833 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1837113796] [2020-07-20 13:38:15,834 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:38:17,442 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:38:17,442 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:38:17,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 6084 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 13:38:17,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:38:21,813 INFO L134 CoverageAnalysis]: Checked inductivity of 350305 backedges. 2201 proven. 15526 refuted. 0 times theorem prover too weak. 332578 trivial. 0 not checked. [2020-07-20 13:38:21,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:38:26,648 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:38:26,752 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:38:27,835 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 13:38:27,941 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 13:38:28,056 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 13:38:28,170 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 13:38:28,285 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-20 13:38:28,391 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-20 13:38:28,493 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-20 13:38:38,682 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:38:41,179 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:38:41,289 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:38:41,398 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-20 13:38:42,349 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:42,349 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:38:51,391 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:01,284 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:01,285 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:05,115 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:05,116 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:09,058 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:10,947 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:12,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:13,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:13,676 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:13,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:14,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:14,248 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:39:18,099 INFO L134 CoverageAnalysis]: Checked inductivity of 350305 backedges. 2201 proven. 15628 refuted. 0 times theorem prover too weak. 332476 trivial. 0 not checked. [2020-07-20 13:39:18,100 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1837113796] [2020-07-20 13:39:18,101 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:39:18,101 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 29] total 32 [2020-07-20 13:39:18,102 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367787063] [2020-07-20 13:39:18,104 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-20 13:39:18,104 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:39:18,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-20 13:39:18,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=832, Unknown=0, NotChecked=0, Total=992 [2020-07-20 13:39:18,105 INFO L87 Difference]: Start difference. First operand 90 states and 199 transitions. Second operand 32 states. [2020-07-20 13:39:19,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:39:19,937 INFO L93 Difference]: Finished difference Result 156 states and 524 transitions. [2020-07-20 13:39:19,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-20 13:39:19,939 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 3364 [2020-07-20 13:39:19,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:39:19,947 INFO L225 Difference]: With dead ends: 156 [2020-07-20 13:39:19,947 INFO L226 Difference]: Without dead ends: 152 [2020-07-20 13:39:19,948 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6741 GetRequests, 6672 SyntacticMatches, 26 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 535 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=369, Invalid=1611, Unknown=0, NotChecked=0, Total=1980 [2020-07-20 13:39:19,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2020-07-20 13:39:19,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 90. [2020-07-20 13:39:19,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-07-20 13:39:19,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 199 transitions. [2020-07-20 13:39:19,969 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 199 transitions. Word has length 3364 [2020-07-20 13:39:19,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:39:19,972 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 199 transitions. [2020-07-20 13:39:19,972 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-20 13:39:19,972 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 199 transitions. [2020-07-20 13:39:20,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4616 [2020-07-20 13:39:20,226 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:39:20,228 INFO L422 BasicCegarLoop]: trace histogram [436, 436, 300, 273, 273, 218, 218, 218, 218, 218, 218, 218, 218, 136, 136, 136, 136, 136, 136, 136, 136, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:39:20,444 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:20,445 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:39:20,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:39:20,446 INFO L82 PathProgramCache]: Analyzing trace with hash -554675479, now seen corresponding path program 12 times [2020-07-20 13:39:20,447 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:39:20,447 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [209249193] [2020-07-20 13:39:20,448 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:39:22,443 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:39:22,443 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:39:22,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 8379 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-20 13:39:22,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:39:30,287 INFO L134 CoverageAnalysis]: Checked inductivity of 691997 backedges. 3152 proven. 22920 refuted. 0 times theorem prover too weak. 665925 trivial. 0 not checked. [2020-07-20 13:39:30,287 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:39:35,315 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:39:35,417 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:39:35,537 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:39:35,644 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:39:36,763 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 13:39:36,875 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 13:39:36,990 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 13:39:37,104 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 13:39:38,754 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 13:39:38,879 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 13:39:39,010 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2020-07-20 13:39:39,138 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2020-07-20 13:39:39,260 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2020-07-20 13:39:39,375 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2020-07-20 13:39:39,490 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-20 13:39:39,597 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-20 13:39:39,699 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-20 13:39:57,334 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:39:57,437 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:39:57,547 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:39:57,657 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:39:58,829 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 13:39:58,942 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 13:39:59,062 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 13:39:59,186 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 13:39:59,310 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-20 13:39:59,417 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-20 13:40:00,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:12,202 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 13:40:14,033 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:40:14,144 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:40:14,262 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:40:14,378 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:40:14,492 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-20 13:40:14,595 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 13:40:15,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:32,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:39,463 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:43,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:46,738 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:46,739 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:49,187 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:50,657 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:51,596 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:52,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:52,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:52,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:52,587 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:52,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:40:59,864 INFO L134 CoverageAnalysis]: Checked inductivity of 691997 backedges. 3152 proven. 23034 refuted. 0 times theorem prover too weak. 665811 trivial. 0 not checked. [2020-07-20 13:40:59,865 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [209249193] [2020-07-20 13:40:59,865 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:40:59,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 31] total 34 [2020-07-20 13:40:59,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [770905036] [2020-07-20 13:40:59,869 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-20 13:40:59,869 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:40:59,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-20 13:40:59,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=944, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 13:40:59,870 INFO L87 Difference]: Start difference. First operand 90 states and 199 transitions. Second operand 34 states. [2020-07-20 13:41:01,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:41:01,735 INFO L93 Difference]: Finished difference Result 161 states and 556 transitions. [2020-07-20 13:41:01,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-20 13:41:01,738 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 4615 [2020-07-20 13:41:01,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:41:01,745 INFO L225 Difference]: With dead ends: 161 [2020-07-20 13:41:01,745 INFO L226 Difference]: Without dead ends: 157 [2020-07-20 13:41:01,746 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9245 GetRequests, 9171 SyntacticMatches, 28 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 625 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=416, Invalid=1840, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 13:41:01,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2020-07-20 13:41:01,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 95. [2020-07-20 13:41:01,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-07-20 13:41:01,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 219 transitions. [2020-07-20 13:41:01,764 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 219 transitions. Word has length 4615 [2020-07-20 13:41:01,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:41:01,767 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 219 transitions. [2020-07-20 13:41:01,767 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-20 13:41:01,767 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 219 transitions. [2020-07-20 13:41:02,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9330 [2020-07-20 13:41:02,163 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:41:02,166 INFO L422 BasicCegarLoop]: trace histogram [846, 846, 625, 533, 533, 423, 423, 423, 423, 423, 423, 423, 423, 359, 266, 266, 266, 266, 266, 266, 266, 221, 110, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:41:02,372 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:41:02,373 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:41:02,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:41:02,376 INFO L82 PathProgramCache]: Analyzing trace with hash -1670319822, now seen corresponding path program 6 times [2020-07-20 13:41:02,377 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:41:02,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [587401376] [2020-07-20 13:41:02,377 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:41:05,562 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:41:05,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:41:05,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 16850 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-20 13:41:05,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:41:31,013 INFO L134 CoverageAnalysis]: Checked inductivity of 2779097 backedges. 4429 proven. 49554 refuted. 0 times theorem prover too weak. 2725114 trivial. 0 not checked. [2020-07-20 13:41:31,013 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:41:36,468 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:41:36,574 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:41:36,686 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:41:36,798 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:41:40,174 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 13:41:40,286 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 13:41:40,409 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 13:41:40,529 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 13:41:46,222 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 13:41:46,352 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 13:41:46,484 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2020-07-20 13:41:46,620 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2020-07-20 13:41:46,752 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2020-07-20 13:41:46,879 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2020-07-20 13:41:46,999 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-20 13:41:47,111 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-20 13:41:47,218 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-20 13:41:47,324 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-20 13:42:45,538 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 31 [2020-07-20 13:42:48,097 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:42:48,205 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:42:49,140 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 13:42:49,249 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 13:42:49,366 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 13:42:49,484 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 13:42:51,346 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:42:51,469 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:42:51,597 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:42:51,715 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:42:55,683 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 13:42:55,821 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 13:42:55,963 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 13:42:56,101 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 13:42:56,249 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-20 13:42:56,385 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 89 [2020-07-20 13:42:56,507 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-20 13:42:56,628 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 13:42:56,741 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 13:42:56,850 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 13:42:56,955 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 13:42:57,733 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:42:57,734 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:43:34,038 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2020-07-20 13:43:38,356 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 13:43:38,482 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 13:43:38,611 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 13:43:38,740 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 13:43:40,821 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:43:40,957 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:43:41,096 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:43:41,234 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:43:41,369 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-20 13:43:41,497 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 13:43:41,618 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 13:43:41,733 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 13:43:41,841 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 13:43:41,946 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 13:43:42,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:00,717 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 13:44:00,825 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 13:44:00,942 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:44:01,057 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:44:02,090 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 13:44:02,211 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 13:44:02,340 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 13:44:02,469 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 13:44:02,597 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 13:44:02,719 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 13:44:02,839 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-20 13:44:02,946 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 13:44:03,719 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:12,156 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 13:44:12,356 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:44:12,461 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:44:13,062 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 13:44:13,177 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 13:44:13,299 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:44:13,421 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:44:13,540 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 13:44:13,652 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 13:44:13,756 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:44:14,438 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:14,439 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:19,787 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 13:44:19,892 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 13:44:20,004 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:44:20,114 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:44:20,220 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:44:20,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:24,850 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 13:44:25,546 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:30,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:32,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:34,009 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:34,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:34,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:35,261 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:35,261 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:35,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:35,595 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:35,791 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:44:35,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 13:45:06,167 INFO L134 CoverageAnalysis]: Checked inductivity of 2779097 backedges. 4429 proven. 49674 refuted. 0 times theorem prover too weak. 2724994 trivial. 0 not checked. [2020-07-20 13:45:06,168 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [587401376] [2020-07-20 13:45:06,168 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 13:45:06,170 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 31] total 34 [2020-07-20 13:45:06,170 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20886757] [2020-07-20 13:45:06,177 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-20 13:45:06,178 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 13:45:06,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-20 13:45:06,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=944, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 13:45:06,179 INFO L87 Difference]: Start difference. First operand 95 states and 219 transitions. Second operand 34 states. [2020-07-20 13:45:09,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 13:45:09,532 INFO L93 Difference]: Finished difference Result 166 states and 590 transitions. [2020-07-20 13:45:09,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-20 13:45:09,539 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 9329 [2020-07-20 13:45:09,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 13:45:09,550 INFO L225 Difference]: With dead ends: 166 [2020-07-20 13:45:09,551 INFO L226 Difference]: Without dead ends: 162 [2020-07-20 13:45:09,552 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18672 GetRequests, 18598 SyntacticMatches, 28 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 625 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=416, Invalid=1840, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 13:45:09,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2020-07-20 13:45:09,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 95. [2020-07-20 13:45:09,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-07-20 13:45:09,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 219 transitions. [2020-07-20 13:45:09,577 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 219 transitions. Word has length 9329 [2020-07-20 13:45:09,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 13:45:09,583 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 219 transitions. [2020-07-20 13:45:09,584 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-20 13:45:09,584 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 219 transitions. [2020-07-20 13:45:10,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8373 [2020-07-20 13:45:10,228 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 13:45:10,231 INFO L422 BasicCegarLoop]: trace histogram [745, 745, 542, 542, 474, 372, 372, 372, 372, 372, 372, 372, 372, 271, 271, 271, 271, 271, 271, 271, 271, 170, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 13:45:10,432 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:45:10,432 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 13:45:10,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 13:45:10,436 INFO L82 PathProgramCache]: Analyzing trace with hash 1593629950, now seen corresponding path program 13 times [2020-07-20 13:45:10,436 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 13:45:10,436 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [565314168] [2020-07-20 13:45:10,436 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 13:45:13,757 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 13:45:13,757 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 13:45:13,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 15192 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-20 13:45:13,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 13:45:39,006 INFO L134 CoverageAnalysis]: Checked inductivity of 2222959 backedges. 4739 proven. 46423 refuted. 0 times theorem prover too weak. 2171797 trivial. 0 not checked. [2020-07-20 13:45:39,007 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 13:45:41,233 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 13:45:41,336 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 13:45:42,004 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 13:45:42,111 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 13:45:42,227 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:45:42,341 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:45:42,878 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 13:45:42,997 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-20 13:45:43,127 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:45:43,260 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 13:45:43,985 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 13:45:44,123 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 13:45:44,266 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 13:45:44,410 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 13:45:46,748 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:45:46,897 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:45:47,058 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:45:47,212 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:45:50,029 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 13:45:50,192 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 13:45:50,368 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 13:45:50,538 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-20 13:45:52,921 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 13:45:53,099 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 13:45:53,286 WARN L193 SmtUtils]: Spent 183.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-20 13:45:53,485 WARN L193 SmtUtils]: Spent 196.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-20 13:46:03,415 WARN L193 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2020-07-20 13:46:03,612 WARN L193 SmtUtils]: Spent 193.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2020-07-20 13:46:03,809 WARN L193 SmtUtils]: Spent 194.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 13:46:04,015 WARN L193 SmtUtils]: Spent 203.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 13:46:04,215 WARN L193 SmtUtils]: Spent 192.00 ms on a formula simplification that was a NOOP. DAG size: 105 [2020-07-20 13:46:04,407 WARN L193 SmtUtils]: Spent 189.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2020-07-20 13:46:04,590 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 98 [2020-07-20 13:46:04,766 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 95 [2020-07-20 13:46:04,935 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-20 13:46:05,099 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-20 13:46:05,254 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-20 13:46:05,397 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 13:46:05,540 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 13:46:05,672 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 13:46:05,801 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-20 13:46:05,917 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 13:46:06,030 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 13:46:06,136 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 13:47:45,486 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-07-20 13:47:45,695 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 13:47:45,802 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 13:47:46,549 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 13:47:46,668 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-20 13:47:46,794 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-20 13:47:46,918 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 49