/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_6-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 16:00:30,979 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 16:00:30,983 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 16:00:31,002 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 16:00:31,002 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 16:00:31,004 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 16:00:31,005 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 16:00:31,007 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 16:00:31,009 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 16:00:31,009 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 16:00:31,010 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 16:00:31,012 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 16:00:31,012 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 16:00:31,013 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 16:00:31,014 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 16:00:31,015 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 16:00:31,016 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 16:00:31,017 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 16:00:31,019 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 16:00:31,020 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 16:00:31,022 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 16:00:31,023 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 16:00:31,024 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 16:00:31,025 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 16:00:31,027 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 16:00:31,034 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 16:00:31,035 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 16:00:31,036 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 16:00:31,037 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 16:00:31,052 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 16:00:31,052 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 16:00:31,053 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 16:00:31,054 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 16:00:31,054 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 16:00:31,054 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 16:00:31,054 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 16:00:31,054 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 16:00:31,055 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 16:00:31,055 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 16:00:31,055 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 16:00:31,055 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 16:00:31,055 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 16:00:31,055 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 16:00:31,056 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 16:00:31,056 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 16:00:31,056 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 16:00:31,056 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 16:00:31,057 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 16:00:31,057 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 16:00:31,057 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 16:00:31,057 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:00:31,057 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 16:00:31,058 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 16:00:31,058 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 16:00:31,058 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 16:00:31,058 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:31,058 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 16:00:31,059 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 16:00:31,059 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 16:00:31,425 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 16:00:31,449 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 16:00:31,455 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 16:00:31,457 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 16:00:31,458 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 16:00:31,459 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_6-1.c [2020-07-21 16:00:31,545 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8c445a054/00ee163764744bd9958715986b35595a/FLAG4396383a7 [2020-07-21 16:00:32,034 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 16:00:32,036 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_6-1.c [2020-07-21 16:00:32,043 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8c445a054/00ee163764744bd9958715986b35595a/FLAG4396383a7 [2020-07-21 16:00:32,463 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8c445a054/00ee163764744bd9958715986b35595a [2020-07-21 16:00:32,475 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 16:00:32,479 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 16:00:32,483 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 16:00:32,484 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 16:00:32,488 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 16:00:32,489 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:00:32" (1/1) ... [2020-07-21 16:00:32,492 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5174a507 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:32, skipping insertion in model container [2020-07-21 16:00:32,493 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 04:00:32" (1/1) ... [2020-07-21 16:00:32,502 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 16:00:32,519 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 16:00:32,690 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:00:32,695 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 16:00:32,714 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 16:00:32,730 INFO L208 MainTranslator]: Completed translation [2020-07-21 16:00:32,731 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:32 WrapperNode [2020-07-21 16:00:32,731 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 16:00:32,732 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 16:00:32,734 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 16:00:32,734 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 16:00:32,747 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:32" (1/1) ... [2020-07-21 16:00:32,748 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:32" (1/1) ... [2020-07-21 16:00:32,754 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:32" (1/1) ... [2020-07-21 16:00:32,754 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:32" (1/1) ... [2020-07-21 16:00:32,850 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:32" (1/1) ... [2020-07-21 16:00:32,853 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:32" (1/1) ... [2020-07-21 16:00:32,854 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:32" (1/1) ... [2020-07-21 16:00:32,856 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 16:00:32,857 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 16:00:32,857 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 16:00:32,857 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 16:00:32,860 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:32" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 16:00:32,931 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 16:00:32,931 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 16:00:32,932 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-21 16:00:32,932 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-21 16:00:32,932 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 16:00:32,933 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 16:00:32,933 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 16:00:32,934 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-21 16:00:32,934 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-21 16:00:32,934 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 16:00:32,934 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 16:00:32,934 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 16:00:33,156 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 16:00:33,156 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 16:00:33,162 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:00:33 BoogieIcfgContainer [2020-07-21 16:00:33,163 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 16:00:33,164 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 16:00:33,164 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 16:00:33,169 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 16:00:33,169 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 04:00:32" (1/3) ... [2020-07-21 16:00:33,170 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f418c31 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:00:33, skipping insertion in model container [2020-07-21 16:00:33,170 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 04:00:32" (2/3) ... [2020-07-21 16:00:33,171 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f418c31 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 04:00:33, skipping insertion in model container [2020-07-21 16:00:33,171 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 04:00:33" (3/3) ... [2020-07-21 16:00:33,173 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_6-1.c [2020-07-21 16:00:33,187 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 16:00:33,200 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 16:00:33,224 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 16:00:33,278 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 16:00:33,278 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 16:00:33,278 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 16:00:33,279 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 16:00:33,279 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 16:00:33,282 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 16:00:33,283 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 16:00:33,283 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 16:00:33,336 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 16:00:33,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 16:00:33,347 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:33,348 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:33,349 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:33,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:33,357 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-21 16:00:33,366 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:33,367 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [346777974] [2020-07-21 16:00:33,367 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:33,440 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:33,440 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:33,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 16:00:33,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:33,537 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:00:33,537 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:00:33,538 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [346777974] [2020-07-21 16:00:33,539 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:00:33,539 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:00:33,540 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784236003] [2020-07-21 16:00:33,545 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:00:33,545 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:33,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:00:33,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:00:33,558 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-21 16:00:33,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:33,693 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-21 16:00:33,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:00:33,696 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 16:00:33,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:33,709 INFO L225 Difference]: With dead ends: 44 [2020-07-21 16:00:33,709 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 16:00:33,714 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 16:00:33,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 16:00:33,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 16:00:33,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 16:00:33,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 16:00:33,771 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-21 16:00:33,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:33,772 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 16:00:33,772 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:00:33,773 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 16:00:33,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 16:00:33,775 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:33,775 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:33,991 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:33,992 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:33,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:33,993 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-21 16:00:33,994 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:33,994 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [587580924] [2020-07-21 16:00:33,994 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:34,022 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:34,023 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:34,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 16:00:34,025 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:34,060 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 16:00:34,061 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 16:00:34,062 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [587580924] [2020-07-21 16:00:34,062 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 16:00:34,062 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 16:00:34,062 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [435472190] [2020-07-21 16:00:34,065 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 16:00:34,065 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:34,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 16:00:34,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 16:00:34,066 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-21 16:00:34,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:34,155 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-21 16:00:34,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 16:00:34,156 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 16:00:34,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:34,158 INFO L225 Difference]: With dead ends: 36 [2020-07-21 16:00:34,158 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 16:00:34,160 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 16:00:34,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 16:00:34,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 16:00:34,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 16:00:34,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 16:00:34,171 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-21 16:00:34,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:34,172 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 16:00:34,172 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 16:00:34,172 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 16:00:34,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 16:00:34,174 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:34,174 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:34,383 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:34,386 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:34,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:34,387 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-21 16:00:34,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:34,390 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1435751146] [2020-07-21 16:00:34,390 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:34,427 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:34,427 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:34,428 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:00:34,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:34,531 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:00:34,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:34,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:34,789 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:34,850 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:00:34,851 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1435751146] [2020-07-21 16:00:34,851 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:34,852 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 16:00:34,852 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137515434] [2020-07-21 16:00:34,853 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 16:00:34,853 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:34,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 16:00:34,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 16:00:34,855 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-21 16:00:35,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:35,042 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 16:00:35,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:00:35,044 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-21 16:00:35,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:35,046 INFO L225 Difference]: With dead ends: 41 [2020-07-21 16:00:35,048 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 16:00:35,049 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:35,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 16:00:35,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-21 16:00:35,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 16:00:35,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 16:00:35,073 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-21 16:00:35,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:35,074 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 16:00:35,074 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 16:00:35,075 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 16:00:35,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 16:00:35,080 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:35,081 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:35,296 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:35,296 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:35,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:35,297 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-21 16:00:35,297 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:35,298 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [703868046] [2020-07-21 16:00:35,299 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:35,329 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:35,329 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:35,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:00:35,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:35,381 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:00:35,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:35,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:35,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:35,622 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 16:00:35,623 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [703868046] [2020-07-21 16:00:35,624 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:35,624 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 16:00:35,625 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1789798689] [2020-07-21 16:00:35,625 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 16:00:35,626 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:35,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 16:00:35,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 16:00:35,628 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-21 16:00:35,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:35,786 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-21 16:00:35,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:00:35,787 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 16:00:35,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:35,789 INFO L225 Difference]: With dead ends: 46 [2020-07-21 16:00:35,790 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 16:00:35,793 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:35,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 16:00:35,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-21 16:00:35,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 16:00:35,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 16:00:35,812 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-21 16:00:35,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:35,814 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 16:00:35,815 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 16:00:35,815 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 16:00:35,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 16:00:35,820 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:35,821 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:36,033 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:36,034 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:36,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:36,036 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-21 16:00:36,036 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:36,037 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [957533796] [2020-07-21 16:00:36,037 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:36,079 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:36,079 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:36,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:36,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:36,157 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 16:00:36,158 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:36,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,524 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:36,565 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 16:00:36,565 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [957533796] [2020-07-21 16:00:36,566 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:36,566 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 16:00:36,566 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [702199282] [2020-07-21 16:00:36,567 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:00:36,568 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:36,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:00:36,569 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:36,569 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-21 16:00:36,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:36,759 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-21 16:00:36,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:36,760 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-21 16:00:36,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:36,765 INFO L225 Difference]: With dead ends: 51 [2020-07-21 16:00:36,766 INFO L226 Difference]: Without dead ends: 47 [2020-07-21 16:00:36,767 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:00:36,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-21 16:00:36,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-21 16:00:36,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 16:00:36,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 16:00:36,787 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-21 16:00:36,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:36,787 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 16:00:36,787 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:00:36,788 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 16:00:36,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 16:00:36,790 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:36,790 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:36,991 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:36,992 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:36,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:36,993 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-21 16:00:36,993 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:36,993 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1089069193] [2020-07-21 16:00:36,994 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:37,041 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:37,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:37,042 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:37,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:37,110 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 16:00:37,111 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:37,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:37,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:37,441 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 16:00:37,442 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1089069193] [2020-07-21 16:00:37,442 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:37,443 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-21 16:00:37,443 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489130316] [2020-07-21 16:00:37,444 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:00:37,444 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:37,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:00:37,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:37,445 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-21 16:00:37,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:37,711 INFO L93 Difference]: Finished difference Result 84 states and 136 transitions. [2020-07-21 16:00:37,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:37,711 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-21 16:00:37,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:37,713 INFO L225 Difference]: With dead ends: 84 [2020-07-21 16:00:37,714 INFO L226 Difference]: Without dead ends: 50 [2020-07-21 16:00:37,715 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 64 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:00:37,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-21 16:00:37,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2020-07-21 16:00:37,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-21 16:00:37,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 67 transitions. [2020-07-21 16:00:37,726 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 67 transitions. Word has length 40 [2020-07-21 16:00:37,727 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:37,728 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 67 transitions. [2020-07-21 16:00:37,728 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:00:37,728 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 67 transitions. [2020-07-21 16:00:37,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 16:00:37,731 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:37,731 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:37,933 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:37,934 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:37,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:37,935 INFO L82 PathProgramCache]: Analyzing trace with hash 208191613, now seen corresponding path program 1 times [2020-07-21 16:00:37,936 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:37,936 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1914312808] [2020-07-21 16:00:37,937 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:37,970 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:37,970 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:37,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:37,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:38,044 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 16:00:38,045 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:38,273 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:38,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:38,392 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 16:00:38,392 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1914312808] [2020-07-21 16:00:38,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:38,393 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 16:00:38,393 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1560827173] [2020-07-21 16:00:38,394 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:00:38,395 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:38,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:00:38,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:38,396 INFO L87 Difference]: Start difference. First operand 47 states and 67 transitions. Second operand 12 states. [2020-07-21 16:00:38,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:38,552 INFO L93 Difference]: Finished difference Result 63 states and 99 transitions. [2020-07-21 16:00:38,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:38,553 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2020-07-21 16:00:38,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:38,559 INFO L225 Difference]: With dead ends: 63 [2020-07-21 16:00:38,559 INFO L226 Difference]: Without dead ends: 59 [2020-07-21 16:00:38,562 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:00:38,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-21 16:00:38,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2020-07-21 16:00:38,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 16:00:38,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 77 transitions. [2020-07-21 16:00:38,592 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 77 transitions. Word has length 41 [2020-07-21 16:00:38,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:38,593 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 77 transitions. [2020-07-21 16:00:38,593 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:00:38,593 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 77 transitions. [2020-07-21 16:00:38,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-21 16:00:38,600 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:38,600 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:38,801 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:38,802 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:38,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:38,803 INFO L82 PathProgramCache]: Analyzing trace with hash -1291563674, now seen corresponding path program 1 times [2020-07-21 16:00:38,803 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:38,803 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [722129751] [2020-07-21 16:00:38,804 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:38,841 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:38,841 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:38,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:00:38,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:38,892 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 16:00:38,893 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:39,029 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:39,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:39,122 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 17 proven. 4 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-07-21 16:00:39,123 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [722129751] [2020-07-21 16:00:39,123 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:39,126 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 16:00:39,127 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1403476942] [2020-07-21 16:00:39,127 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 16:00:39,128 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:39,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 16:00:39,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 16:00:39,128 INFO L87 Difference]: Start difference. First operand 51 states and 77 transitions. Second operand 10 states. [2020-07-21 16:00:39,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:39,264 INFO L93 Difference]: Finished difference Result 65 states and 105 transitions. [2020-07-21 16:00:39,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:00:39,265 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 53 [2020-07-21 16:00:39,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:39,267 INFO L225 Difference]: With dead ends: 65 [2020-07-21 16:00:39,267 INFO L226 Difference]: Without dead ends: 61 [2020-07-21 16:00:39,268 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 95 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:39,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-21 16:00:39,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2020-07-21 16:00:39,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-21 16:00:39,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 82 transitions. [2020-07-21 16:00:39,281 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 82 transitions. Word has length 53 [2020-07-21 16:00:39,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:39,282 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 82 transitions. [2020-07-21 16:00:39,282 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 16:00:39,282 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 82 transitions. [2020-07-21 16:00:39,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-21 16:00:39,284 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:39,284 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:39,499 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:39,500 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:39,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:39,501 INFO L82 PathProgramCache]: Analyzing trace with hash 736840020, now seen corresponding path program 2 times [2020-07-21 16:00:39,502 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:39,503 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [198674598] [2020-07-21 16:00:39,503 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:39,554 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:39,554 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:39,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:00:39,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:39,639 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 55 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-21 16:00:39,639 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:40,028 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:40,029 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:40,119 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:40,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:40,169 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:40,170 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:40,211 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 9 proven. 59 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2020-07-21 16:00:40,212 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [198674598] [2020-07-21 16:00:40,212 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:40,212 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 16:00:40,213 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260230761] [2020-07-21 16:00:40,213 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:00:40,214 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:40,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:00:40,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:00:40,215 INFO L87 Difference]: Start difference. First operand 53 states and 82 transitions. Second operand 14 states. [2020-07-21 16:00:40,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:40,406 INFO L93 Difference]: Finished difference Result 75 states and 134 transitions. [2020-07-21 16:00:40,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:00:40,407 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 78 [2020-07-21 16:00:40,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:40,410 INFO L225 Difference]: With dead ends: 75 [2020-07-21 16:00:40,410 INFO L226 Difference]: Without dead ends: 71 [2020-07-21 16:00:40,411 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 137 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:00:40,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-21 16:00:40,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 56. [2020-07-21 16:00:40,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 16:00:40,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 90 transitions. [2020-07-21 16:00:40,426 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 90 transitions. Word has length 78 [2020-07-21 16:00:40,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:40,426 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 90 transitions. [2020-07-21 16:00:40,427 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:00:40,427 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 90 transitions. [2020-07-21 16:00:40,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 16:00:40,429 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:40,429 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:40,642 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:40,643 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:40,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:40,643 INFO L82 PathProgramCache]: Analyzing trace with hash 1583364703, now seen corresponding path program 1 times [2020-07-21 16:00:40,644 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:40,645 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [559707741] [2020-07-21 16:00:40,645 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:40,695 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:40,695 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:40,696 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:40,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:40,780 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 54 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 16:00:40,781 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:41,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:41,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:41,151 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-21 16:00:41,152 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [559707741] [2020-07-21 16:00:41,152 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:41,152 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-21 16:00:41,152 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213993364] [2020-07-21 16:00:41,153 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:00:41,153 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:41,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:00:41,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:41,154 INFO L87 Difference]: Start difference. First operand 56 states and 90 transitions. Second operand 12 states. [2020-07-21 16:00:41,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:41,373 INFO L93 Difference]: Finished difference Result 114 states and 219 transitions. [2020-07-21 16:00:41,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:41,374 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 67 [2020-07-21 16:00:41,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:41,376 INFO L225 Difference]: With dead ends: 114 [2020-07-21 16:00:41,377 INFO L226 Difference]: Without dead ends: 64 [2020-07-21 16:00:41,379 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 119 SyntacticMatches, 7 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:00:41,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-21 16:00:41,389 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2020-07-21 16:00:41,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 16:00:41,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 101 transitions. [2020-07-21 16:00:41,391 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 101 transitions. Word has length 67 [2020-07-21 16:00:41,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:41,392 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 101 transitions. [2020-07-21 16:00:41,392 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:00:41,392 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 101 transitions. [2020-07-21 16:00:41,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-21 16:00:41,394 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:41,394 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:41,608 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:41,610 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:41,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:41,610 INFO L82 PathProgramCache]: Analyzing trace with hash -1763147687, now seen corresponding path program 2 times [2020-07-21 16:00:41,611 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:41,611 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [964886238] [2020-07-21 16:00:41,612 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:41,655 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:41,656 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:41,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:41,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:41,747 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 32 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-21 16:00:41,748 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:42,059 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:42,292 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:42,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:42,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:42,383 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 34 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-21 16:00:42,384 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [964886238] [2020-07-21 16:00:42,384 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:42,384 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-21 16:00:42,384 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426508814] [2020-07-21 16:00:42,385 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:00:42,385 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:42,385 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:00:42,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:00:42,386 INFO L87 Difference]: Start difference. First operand 61 states and 101 transitions. Second operand 17 states. [2020-07-21 16:00:42,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:42,816 INFO L93 Difference]: Finished difference Result 131 states and 252 transitions. [2020-07-21 16:00:42,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:00:42,817 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 68 [2020-07-21 16:00:42,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:42,819 INFO L225 Difference]: With dead ends: 131 [2020-07-21 16:00:42,819 INFO L226 Difference]: Without dead ends: 76 [2020-07-21 16:00:42,821 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 116 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-21 16:00:42,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-21 16:00:42,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 68. [2020-07-21 16:00:42,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-07-21 16:00:42,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 106 transitions. [2020-07-21 16:00:42,837 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 106 transitions. Word has length 68 [2020-07-21 16:00:42,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:42,838 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 106 transitions. [2020-07-21 16:00:42,838 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:00:42,838 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 106 transitions. [2020-07-21 16:00:42,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-07-21 16:00:42,840 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:42,840 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:43,041 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:43,042 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:43,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:43,042 INFO L82 PathProgramCache]: Analyzing trace with hash -1986769418, now seen corresponding path program 1 times [2020-07-21 16:00:43,042 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:43,043 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [147418652] [2020-07-21 16:00:43,043 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:43,092 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:43,092 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:43,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:00:43,095 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:43,198 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 53 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 16:00:43,199 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:43,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,713 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:43,972 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:44,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:44,021 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:44,066 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 39 proven. 57 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-07-21 16:00:44,067 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [147418652] [2020-07-21 16:00:44,067 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:44,067 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-21 16:00:44,067 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657678804] [2020-07-21 16:00:44,068 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:00:44,068 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:44,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:00:44,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:44,069 INFO L87 Difference]: Start difference. First operand 68 states and 106 transitions. Second operand 21 states. [2020-07-21 16:00:44,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:44,925 INFO L93 Difference]: Finished difference Result 186 states and 366 transitions. [2020-07-21 16:00:44,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 16:00:44,926 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 82 [2020-07-21 16:00:44,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:44,932 INFO L225 Difference]: With dead ends: 186 [2020-07-21 16:00:44,932 INFO L226 Difference]: Without dead ends: 124 [2020-07-21 16:00:44,935 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 145 SyntacticMatches, 11 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=268, Invalid=1214, Unknown=0, NotChecked=0, Total=1482 [2020-07-21 16:00:44,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-21 16:00:44,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 110. [2020-07-21 16:00:44,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-07-21 16:00:44,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 179 transitions. [2020-07-21 16:00:44,974 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 179 transitions. Word has length 82 [2020-07-21 16:00:44,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:44,975 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 179 transitions. [2020-07-21 16:00:44,975 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:00:44,976 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 179 transitions. [2020-07-21 16:00:44,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-21 16:00:44,981 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:44,981 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:45,194 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:45,195 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:45,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:45,196 INFO L82 PathProgramCache]: Analyzing trace with hash -1156896337, now seen corresponding path program 3 times [2020-07-21 16:00:45,196 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:45,197 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1603376661] [2020-07-21 16:00:45,197 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:45,263 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:45,264 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:45,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:00:45,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:45,321 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 39 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2020-07-21 16:00:45,322 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:45,658 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:45,735 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:45,736 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:45,780 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:45,813 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 8 proven. 44 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2020-07-21 16:00:45,814 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1603376661] [2020-07-21 16:00:45,814 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:45,814 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 16:00:45,814 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147262056] [2020-07-21 16:00:45,815 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:00:45,815 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:45,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:00:45,816 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:00:45,816 INFO L87 Difference]: Start difference. First operand 110 states and 179 transitions. Second operand 14 states. [2020-07-21 16:00:46,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:46,002 INFO L93 Difference]: Finished difference Result 114 states and 182 transitions. [2020-07-21 16:00:46,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:00:46,003 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 68 [2020-07-21 16:00:46,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:46,005 INFO L225 Difference]: With dead ends: 114 [2020-07-21 16:00:46,005 INFO L226 Difference]: Without dead ends: 110 [2020-07-21 16:00:46,006 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 118 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 16:00:46,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-21 16:00:46,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 102. [2020-07-21 16:00:46,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2020-07-21 16:00:46,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 159 transitions. [2020-07-21 16:00:46,018 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 159 transitions. Word has length 68 [2020-07-21 16:00:46,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:46,019 INFO L479 AbstractCegarLoop]: Abstraction has 102 states and 159 transitions. [2020-07-21 16:00:46,019 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:00:46,019 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 159 transitions. [2020-07-21 16:00:46,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-07-21 16:00:46,021 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:46,021 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:46,235 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:46,236 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:46,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:46,237 INFO L82 PathProgramCache]: Analyzing trace with hash 918304791, now seen corresponding path program 4 times [2020-07-21 16:00:46,237 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:46,238 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [937624119] [2020-07-21 16:00:46,238 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:46,293 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:46,293 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:46,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:46,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:46,390 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 33 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2020-07-21 16:00:46,390 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:46,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:46,892 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:46,927 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:47,064 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:47,066 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:47,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:47,143 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 78 proven. 35 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2020-07-21 16:00:47,144 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [937624119] [2020-07-21 16:00:47,144 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:47,144 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 19 [2020-07-21 16:00:47,145 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665693334] [2020-07-21 16:00:47,146 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:00:47,146 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:47,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:00:47,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:00:47,147 INFO L87 Difference]: Start difference. First operand 102 states and 159 transitions. Second operand 19 states. [2020-07-21 16:00:47,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:47,641 INFO L93 Difference]: Finished difference Result 269 states and 520 transitions. [2020-07-21 16:00:47,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 16:00:47,651 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 94 [2020-07-21 16:00:47,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:47,655 INFO L225 Difference]: With dead ends: 269 [2020-07-21 16:00:47,655 INFO L226 Difference]: Without dead ends: 168 [2020-07-21 16:00:47,658 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 162 SyntacticMatches, 9 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=157, Invalid=713, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:00:47,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2020-07-21 16:00:47,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 144. [2020-07-21 16:00:47,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-07-21 16:00:47,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 247 transitions. [2020-07-21 16:00:47,686 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 247 transitions. Word has length 94 [2020-07-21 16:00:47,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:47,687 INFO L479 AbstractCegarLoop]: Abstraction has 144 states and 247 transitions. [2020-07-21 16:00:47,687 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:00:47,688 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 247 transitions. [2020-07-21 16:00:47,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-07-21 16:00:47,690 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:47,690 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:47,904 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:47,905 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:47,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:47,905 INFO L82 PathProgramCache]: Analyzing trace with hash -1676117994, now seen corresponding path program 2 times [2020-07-21 16:00:47,906 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:47,906 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1589243171] [2020-07-21 16:00:47,907 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:47,968 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:47,969 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:47,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:47,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:48,012 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 29 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2020-07-21 16:00:48,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:48,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:48,309 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:48,310 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:48,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:48,382 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 30 proven. 31 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2020-07-21 16:00:48,382 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1589243171] [2020-07-21 16:00:48,382 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:48,383 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 16:00:48,383 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1408021874] [2020-07-21 16:00:48,383 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:00:48,383 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:48,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:00:48,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:48,384 INFO L87 Difference]: Start difference. First operand 144 states and 247 transitions. Second operand 12 states. [2020-07-21 16:00:48,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:48,550 INFO L93 Difference]: Finished difference Result 167 states and 289 transitions. [2020-07-21 16:00:48,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:48,552 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 80 [2020-07-21 16:00:48,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:48,555 INFO L225 Difference]: With dead ends: 167 [2020-07-21 16:00:48,555 INFO L226 Difference]: Without dead ends: 163 [2020-07-21 16:00:48,559 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 144 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:00:48,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2020-07-21 16:00:48,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 157. [2020-07-21 16:00:48,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2020-07-21 16:00:48,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 272 transitions. [2020-07-21 16:00:48,577 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 272 transitions. Word has length 80 [2020-07-21 16:00:48,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:48,578 INFO L479 AbstractCegarLoop]: Abstraction has 157 states and 272 transitions. [2020-07-21 16:00:48,578 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:00:48,578 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 272 transitions. [2020-07-21 16:00:48,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-21 16:00:48,583 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:48,583 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:48,797 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:48,798 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:48,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:48,799 INFO L82 PathProgramCache]: Analyzing trace with hash 2019487259, now seen corresponding path program 3 times [2020-07-21 16:00:48,799 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:48,799 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [79185209] [2020-07-21 16:00:48,800 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:48,866 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:48,867 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:48,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:00:48,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:48,965 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 177 proven. 90 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2020-07-21 16:00:48,966 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:49,733 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:49,734 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:49,795 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:50,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:50,097 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:50,151 INFO L134 CoverageAnalysis]: Checked inductivity of 357 backedges. 71 proven. 141 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-07-21 16:00:50,152 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [79185209] [2020-07-21 16:00:50,152 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:50,152 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-21 16:00:50,153 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [330642085] [2020-07-21 16:00:50,153 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:00:50,154 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:50,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:00:50,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:50,154 INFO L87 Difference]: Start difference. First operand 157 states and 272 transitions. Second operand 21 states. [2020-07-21 16:00:50,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:50,719 INFO L93 Difference]: Finished difference Result 369 states and 701 transitions. [2020-07-21 16:00:50,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 16:00:50,720 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 120 [2020-07-21 16:00:50,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:50,724 INFO L225 Difference]: With dead ends: 369 [2020-07-21 16:00:50,724 INFO L226 Difference]: Without dead ends: 218 [2020-07-21 16:00:50,727 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 255 GetRequests, 213 SyntacticMatches, 11 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=187, Invalid=869, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:00:50,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 218 states. [2020-07-21 16:00:50,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 218 to 173. [2020-07-21 16:00:50,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2020-07-21 16:00:50,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 306 transitions. [2020-07-21 16:00:50,747 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 306 transitions. Word has length 120 [2020-07-21 16:00:50,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:50,747 INFO L479 AbstractCegarLoop]: Abstraction has 173 states and 306 transitions. [2020-07-21 16:00:50,747 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:00:50,748 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 306 transitions. [2020-07-21 16:00:50,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-07-21 16:00:50,751 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:50,751 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:50,964 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:50,965 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:50,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:50,965 INFO L82 PathProgramCache]: Analyzing trace with hash -923530611, now seen corresponding path program 4 times [2020-07-21 16:00:50,965 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:50,965 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1446878854] [2020-07-21 16:00:50,965 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:51,048 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:51,048 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:51,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:51,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:51,104 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 14 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2020-07-21 16:00:51,104 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:51,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,332 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,442 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:51,496 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 16 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2020-07-21 16:00:51,496 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1446878854] [2020-07-21 16:00:51,496 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:51,497 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 16:00:51,497 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567953648] [2020-07-21 16:00:51,497 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:00:51,498 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:51,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:00:51,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:51,498 INFO L87 Difference]: Start difference. First operand 173 states and 306 transitions. Second operand 12 states. [2020-07-21 16:00:51,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:51,649 INFO L93 Difference]: Finished difference Result 191 states and 349 transitions. [2020-07-21 16:00:51,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:51,650 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 92 [2020-07-21 16:00:51,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:51,653 INFO L225 Difference]: With dead ends: 191 [2020-07-21 16:00:51,653 INFO L226 Difference]: Without dead ends: 187 [2020-07-21 16:00:51,654 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 169 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:00:51,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2020-07-21 16:00:51,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 176. [2020-07-21 16:00:51,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-07-21 16:00:51,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 316 transitions. [2020-07-21 16:00:51,669 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 316 transitions. Word has length 92 [2020-07-21 16:00:51,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:51,670 INFO L479 AbstractCegarLoop]: Abstraction has 176 states and 316 transitions. [2020-07-21 16:00:51,670 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:00:51,670 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 316 transitions. [2020-07-21 16:00:51,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 16:00:51,673 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:51,673 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:51,888 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:51,889 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:51,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:51,890 INFO L82 PathProgramCache]: Analyzing trace with hash -1258440967, now seen corresponding path program 3 times [2020-07-21 16:00:51,890 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:51,890 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [621318005] [2020-07-21 16:00:51,891 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:51,972 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:51,973 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:51,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 262 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:51,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:52,038 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 117 refuted. 0 times theorem prover too weak. 191 trivial. 0 not checked. [2020-07-21 16:00:52,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:52,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,785 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,915 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:52,963 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 21 proven. 125 refuted. 0 times theorem prover too weak. 183 trivial. 0 not checked. [2020-07-21 16:00:52,964 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [621318005] [2020-07-21 16:00:52,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:52,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 16:00:52,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1580050673] [2020-07-21 16:00:52,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 16:00:52,965 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:52,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 16:00:52,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 16:00:52,966 INFO L87 Difference]: Start difference. First operand 176 states and 316 transitions. Second operand 16 states. [2020-07-21 16:00:53,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:53,199 INFO L93 Difference]: Finished difference Result 206 states and 384 transitions. [2020-07-21 16:00:53,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:00:53,200 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 117 [2020-07-21 16:00:53,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:53,204 INFO L225 Difference]: With dead ends: 206 [2020-07-21 16:00:53,204 INFO L226 Difference]: Without dead ends: 202 [2020-07-21 16:00:53,205 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:53,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 202 states. [2020-07-21 16:00:53,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 202 to 186. [2020-07-21 16:00:53,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2020-07-21 16:00:53,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 342 transitions. [2020-07-21 16:00:53,222 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 342 transitions. Word has length 117 [2020-07-21 16:00:53,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:53,222 INFO L479 AbstractCegarLoop]: Abstraction has 186 states and 342 transitions. [2020-07-21 16:00:53,222 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 16:00:53,222 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 342 transitions. [2020-07-21 16:00:53,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-21 16:00:53,225 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:53,225 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:53,440 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:53,441 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:53,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:53,442 INFO L82 PathProgramCache]: Analyzing trace with hash -650257977, now seen corresponding path program 5 times [2020-07-21 16:00:53,442 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:53,442 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1287674497] [2020-07-21 16:00:53,443 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:53,524 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:53,524 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:53,525 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:53,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:53,605 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 210 proven. 31 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-21 16:00:53,605 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:54,160 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:54,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:54,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:54,408 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:54,453 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:54,494 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 51 proven. 126 refuted. 0 times theorem prover too weak. 164 trivial. 0 not checked. [2020-07-21 16:00:54,494 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1287674497] [2020-07-21 16:00:54,495 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:54,495 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-21 16:00:54,495 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1025216080] [2020-07-21 16:00:54,496 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:00:54,496 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:54,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:00:54,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:00:54,496 INFO L87 Difference]: Start difference. First operand 186 states and 342 transitions. Second operand 17 states. [2020-07-21 16:00:54,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:54,842 INFO L93 Difference]: Finished difference Result 376 states and 717 transitions. [2020-07-21 16:00:54,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:00:54,842 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 120 [2020-07-21 16:00:54,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:54,845 INFO L225 Difference]: With dead ends: 376 [2020-07-21 16:00:54,846 INFO L226 Difference]: Without dead ends: 192 [2020-07-21 16:00:54,848 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 214 SyntacticMatches, 11 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2020-07-21 16:00:54,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2020-07-21 16:00:54,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 190. [2020-07-21 16:00:54,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-21 16:00:54,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 336 transitions. [2020-07-21 16:00:54,863 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 336 transitions. Word has length 120 [2020-07-21 16:00:54,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:54,863 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 336 transitions. [2020-07-21 16:00:54,863 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:00:54,863 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 336 transitions. [2020-07-21 16:00:54,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2020-07-21 16:00:54,867 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:54,868 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 9, 9, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:55,080 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:55,081 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:55,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:55,081 INFO L82 PathProgramCache]: Analyzing trace with hash 1301266126, now seen corresponding path program 6 times [2020-07-21 16:00:55,081 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:55,082 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [43518546] [2020-07-21 16:00:55,082 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:55,186 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:55,187 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:55,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:00:55,192 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:55,350 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 145 proven. 298 refuted. 0 times theorem prover too weak. 457 trivial. 0 not checked. [2020-07-21 16:00:55,350 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:56,306 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:56,433 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:56,491 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:56,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:56,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:56,980 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:56,981 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:57,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:57,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:57,136 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:57,200 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 147 proven. 306 refuted. 0 times theorem prover too weak. 447 trivial. 0 not checked. [2020-07-21 16:00:57,200 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [43518546] [2020-07-21 16:00:57,201 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:57,201 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 25 [2020-07-21 16:00:57,201 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86512070] [2020-07-21 16:00:57,202 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:00:57,202 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:57,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:00:57,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=525, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:00:57,203 INFO L87 Difference]: Start difference. First operand 190 states and 336 transitions. Second operand 25 states. [2020-07-21 16:00:58,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:58,215 INFO L93 Difference]: Finished difference Result 479 states and 998 transitions. [2020-07-21 16:00:58,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 16:00:58,223 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 187 [2020-07-21 16:00:58,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:58,227 INFO L225 Difference]: With dead ends: 479 [2020-07-21 16:00:58,227 INFO L226 Difference]: Without dead ends: 294 [2020-07-21 16:00:58,231 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 391 GetRequests, 335 SyntacticMatches, 15 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 284 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=306, Invalid=1500, Unknown=0, NotChecked=0, Total=1806 [2020-07-21 16:00:58,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2020-07-21 16:00:58,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 239. [2020-07-21 16:00:58,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 239 states. [2020-07-21 16:00:58,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 445 transitions. [2020-07-21 16:00:58,254 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 445 transitions. Word has length 187 [2020-07-21 16:00:58,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:58,255 INFO L479 AbstractCegarLoop]: Abstraction has 239 states and 445 transitions. [2020-07-21 16:00:58,255 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:00:58,255 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 445 transitions. [2020-07-21 16:00:58,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2020-07-21 16:00:58,258 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:58,259 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 8, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:58,473 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:58,474 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:58,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:58,475 INFO L82 PathProgramCache]: Analyzing trace with hash 2011292190, now seen corresponding path program 7 times [2020-07-21 16:00:58,475 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:58,475 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1237891513] [2020-07-21 16:00:58,475 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:58,600 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:58,600 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:58,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:00:58,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:58,774 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 95 proven. 169 refuted. 0 times theorem prover too weak. 173 trivial. 0 not checked. [2020-07-21 16:00:58,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:59,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:59,692 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:59,756 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:00,172 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:00,259 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:00,322 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:00,380 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 95 proven. 179 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2020-07-21 16:01:00,381 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1237891513] [2020-07-21 16:01:00,381 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:00,381 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-21 16:01:00,381 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1768795316] [2020-07-21 16:01:00,382 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:01:00,382 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:00,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:01:00,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:01:00,383 INFO L87 Difference]: Start difference. First operand 239 states and 445 transitions. Second operand 23 states. [2020-07-21 16:01:01,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:01,244 INFO L93 Difference]: Finished difference Result 491 states and 962 transitions. [2020-07-21 16:01:01,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 16:01:01,245 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 136 [2020-07-21 16:01:01,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:01,248 INFO L225 Difference]: With dead ends: 491 [2020-07-21 16:01:01,248 INFO L226 Difference]: Without dead ends: 257 [2020-07-21 16:01:01,251 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 241 SyntacticMatches, 17 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=276, Invalid=1284, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 16:01:01,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2020-07-21 16:01:01,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 238. [2020-07-21 16:01:01,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2020-07-21 16:01:01,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 446 transitions. [2020-07-21 16:01:01,273 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 446 transitions. Word has length 136 [2020-07-21 16:01:01,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:01,274 INFO L479 AbstractCegarLoop]: Abstraction has 238 states and 446 transitions. [2020-07-21 16:01:01,274 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:01:01,274 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 446 transitions. [2020-07-21 16:01:01,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2020-07-21 16:01:01,277 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:01,277 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 7, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:01,491 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:01,492 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:01,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:01,492 INFO L82 PathProgramCache]: Analyzing trace with hash -400360989, now seen corresponding path program 8 times [2020-07-21 16:01:01,493 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:01,493 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [721516355] [2020-07-21 16:01:01,493 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:01,650 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:01,651 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:01,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:01:01,656 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:01,814 INFO L134 CoverageAnalysis]: Checked inductivity of 340 backedges. 85 proven. 124 refuted. 0 times theorem prover too weak. 131 trivial. 0 not checked. [2020-07-21 16:01:01,815 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:02,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:02,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:02,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:02,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:02,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:02,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:03,067 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:03,068 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:03,115 INFO L134 CoverageAnalysis]: Checked inductivity of 340 backedges. 85 proven. 131 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2020-07-21 16:01:03,116 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [721516355] [2020-07-21 16:01:03,116 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:03,116 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-21 16:01:03,116 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291533144] [2020-07-21 16:01:03,117 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:01:03,117 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:03,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:01:03,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:01:03,118 INFO L87 Difference]: Start difference. First operand 238 states and 446 transitions. Second operand 21 states. [2020-07-21 16:01:03,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:03,859 INFO L93 Difference]: Finished difference Result 487 states and 959 transitions. [2020-07-21 16:01:03,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-21 16:01:03,863 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 122 [2020-07-21 16:01:03,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:03,866 INFO L225 Difference]: With dead ends: 487 [2020-07-21 16:01:03,866 INFO L226 Difference]: Without dead ends: 250 [2020-07-21 16:01:03,869 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 209 SyntacticMatches, 15 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=241, Invalid=1091, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 16:01:03,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2020-07-21 16:01:03,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 232. [2020-07-21 16:01:03,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2020-07-21 16:01:03,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 429 transitions. [2020-07-21 16:01:03,891 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 429 transitions. Word has length 122 [2020-07-21 16:01:03,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:03,891 INFO L479 AbstractCegarLoop]: Abstraction has 232 states and 429 transitions. [2020-07-21 16:01:03,891 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:01:03,891 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 429 transitions. [2020-07-21 16:01:03,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-07-21 16:01:03,895 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:03,895 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:04,108 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:04,109 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:04,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:04,109 INFO L82 PathProgramCache]: Analyzing trace with hash -1245954009, now seen corresponding path program 9 times [2020-07-21 16:01:04,110 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:04,110 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1479950554] [2020-07-21 16:01:04,111 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:04,245 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:04,245 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:04,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:01:04,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:04,381 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 78 proven. 124 refuted. 0 times theorem prover too weak. 139 trivial. 0 not checked. [2020-07-21 16:01:04,381 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:04,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:05,022 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:05,023 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:05,451 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:05,541 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:05,542 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:05,598 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:05,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:05,657 INFO L134 CoverageAnalysis]: Checked inductivity of 341 backedges. 78 proven. 130 refuted. 0 times theorem prover too weak. 133 trivial. 0 not checked. [2020-07-21 16:01:05,658 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1479950554] [2020-07-21 16:01:05,658 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:05,658 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-21 16:01:05,658 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1701753814] [2020-07-21 16:01:05,659 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:01:05,659 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:05,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:01:05,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:01:05,660 INFO L87 Difference]: Start difference. First operand 232 states and 429 transitions. Second operand 21 states. [2020-07-21 16:01:06,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:06,342 INFO L93 Difference]: Finished difference Result 471 states and 930 transitions. [2020-07-21 16:01:06,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 16:01:06,342 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 120 [2020-07-21 16:01:06,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:06,345 INFO L225 Difference]: With dead ends: 471 [2020-07-21 16:01:06,346 INFO L226 Difference]: Without dead ends: 243 [2020-07-21 16:01:06,348 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 211 SyntacticMatches, 15 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=186, Invalid=870, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:01:06,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2020-07-21 16:01:06,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 229. [2020-07-21 16:01:06,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 229 states. [2020-07-21 16:01:06,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 399 transitions. [2020-07-21 16:01:06,368 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 399 transitions. Word has length 120 [2020-07-21 16:01:06,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:06,369 INFO L479 AbstractCegarLoop]: Abstraction has 229 states and 399 transitions. [2020-07-21 16:01:06,369 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:01:06,369 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 399 transitions. [2020-07-21 16:01:06,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 16:01:06,372 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:06,372 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:06,586 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:06,587 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:06,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:06,587 INFO L82 PathProgramCache]: Analyzing trace with hash 989968015, now seen corresponding path program 10 times [2020-07-21 16:01:06,588 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:06,588 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1593775232] [2020-07-21 16:01:06,588 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:06,720 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:06,721 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:06,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:01:06,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:06,794 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 24 proven. 129 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2020-07-21 16:01:06,794 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:07,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:07,598 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:07,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:07,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:07,734 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:07,774 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 24 proven. 139 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2020-07-21 16:01:07,775 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1593775232] [2020-07-21 16:01:07,775 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:07,775 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 16:01:07,775 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1823727161] [2020-07-21 16:01:07,775 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 16:01:07,776 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:07,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 16:01:07,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:01:07,776 INFO L87 Difference]: Start difference. First operand 229 states and 399 transitions. Second operand 15 states. [2020-07-21 16:01:07,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:07,995 INFO L93 Difference]: Finished difference Result 236 states and 410 transitions. [2020-07-21 16:01:07,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:01:07,996 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 121 [2020-07-21 16:01:07,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:07,998 INFO L225 Difference]: With dead ends: 236 [2020-07-21 16:01:07,998 INFO L226 Difference]: Without dead ends: 232 [2020-07-21 16:01:07,999 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 217 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:01:08,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2020-07-21 16:01:08,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 229. [2020-07-21 16:01:08,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 229 states. [2020-07-21 16:01:08,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 399 transitions. [2020-07-21 16:01:08,015 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 399 transitions. Word has length 121 [2020-07-21 16:01:08,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:08,016 INFO L479 AbstractCegarLoop]: Abstraction has 229 states and 399 transitions. [2020-07-21 16:01:08,016 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 16:01:08,017 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 399 transitions. [2020-07-21 16:01:08,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2020-07-21 16:01:08,022 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:08,022 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 15, 13, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 9, 8, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:08,235 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:08,236 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:08,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:08,236 INFO L82 PathProgramCache]: Analyzing trace with hash 1896631445, now seen corresponding path program 11 times [2020-07-21 16:01:08,237 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:08,237 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1314612444] [2020-07-21 16:01:08,237 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:08,416 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:08,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:08,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 455 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:01:08,430 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:08,617 INFO L134 CoverageAnalysis]: Checked inductivity of 2559 backedges. 1434 proven. 202 refuted. 0 times theorem prover too weak. 923 trivial. 0 not checked. [2020-07-21 16:01:08,617 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:10,394 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:10,511 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:10,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:10,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:10,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:10,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:10,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:11,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:11,061 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:11,117 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:11,118 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:11,197 INFO L134 CoverageAnalysis]: Checked inductivity of 2559 backedges. 182 proven. 714 refuted. 0 times theorem prover too weak. 1663 trivial. 0 not checked. [2020-07-21 16:01:11,197 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1314612444] [2020-07-21 16:01:11,197 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:11,197 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 23 [2020-07-21 16:01:11,197 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060045620] [2020-07-21 16:01:11,198 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:01:11,198 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:11,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:01:11,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=439, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:01:11,198 INFO L87 Difference]: Start difference. First operand 229 states and 399 transitions. Second operand 23 states. [2020-07-21 16:01:12,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:12,249 INFO L93 Difference]: Finished difference Result 499 states and 944 transitions. [2020-07-21 16:01:12,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 16:01:12,249 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 305 [2020-07-21 16:01:12,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:12,252 INFO L225 Difference]: With dead ends: 499 [2020-07-21 16:01:12,252 INFO L226 Difference]: Without dead ends: 271 [2020-07-21 16:01:12,254 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 627 GetRequests, 572 SyntacticMatches, 17 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 244 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=276, Invalid=1284, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 16:01:12,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2020-07-21 16:01:12,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 235. [2020-07-21 16:01:12,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 235 states. [2020-07-21 16:01:12,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 402 transitions. [2020-07-21 16:01:12,275 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 402 transitions. Word has length 305 [2020-07-21 16:01:12,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:12,276 INFO L479 AbstractCegarLoop]: Abstraction has 235 states and 402 transitions. [2020-07-21 16:01:12,276 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:01:12,276 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 402 transitions. [2020-07-21 16:01:12,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 16:01:12,279 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:12,279 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:12,494 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:12,495 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:12,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:12,495 INFO L82 PathProgramCache]: Analyzing trace with hash -1905629551, now seen corresponding path program 12 times [2020-07-21 16:01:12,495 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:12,496 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1210144783] [2020-07-21 16:01:12,496 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:12,650 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:12,650 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:12,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:01:12,654 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:12,726 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 47 proven. 86 refuted. 0 times theorem prover too weak. 213 trivial. 0 not checked. [2020-07-21 16:01:12,726 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:13,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:13,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:13,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:13,296 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:13,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:13,385 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 47 proven. 91 refuted. 0 times theorem prover too weak. 208 trivial. 0 not checked. [2020-07-21 16:01:13,385 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1210144783] [2020-07-21 16:01:13,385 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:13,386 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 16:01:13,386 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165004801] [2020-07-21 16:01:13,386 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 16:01:13,387 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:13,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 16:01:13,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 16:01:13,387 INFO L87 Difference]: Start difference. First operand 235 states and 402 transitions. Second operand 13 states. [2020-07-21 16:01:13,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:13,557 INFO L93 Difference]: Finished difference Result 278 states and 502 transitions. [2020-07-21 16:01:13,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:01:13,562 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 121 [2020-07-21 16:01:13,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:13,566 INFO L225 Difference]: With dead ends: 278 [2020-07-21 16:01:13,566 INFO L226 Difference]: Without dead ends: 274 [2020-07-21 16:01:13,567 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 221 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:01:13,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2020-07-21 16:01:13,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 248. [2020-07-21 16:01:13,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2020-07-21 16:01:13,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 431 transitions. [2020-07-21 16:01:13,590 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 431 transitions. Word has length 121 [2020-07-21 16:01:13,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:13,590 INFO L479 AbstractCegarLoop]: Abstraction has 248 states and 431 transitions. [2020-07-21 16:01:13,590 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 16:01:13,590 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 431 transitions. [2020-07-21 16:01:13,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-07-21 16:01:13,593 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:13,593 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:13,807 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:13,808 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:13,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:13,808 INFO L82 PathProgramCache]: Analyzing trace with hash 2023571201, now seen corresponding path program 2 times [2020-07-21 16:01:13,809 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:13,809 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1925936048] [2020-07-21 16:01:13,810 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:14,032 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:14,033 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:14,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:01:14,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:14,105 INFO L134 CoverageAnalysis]: Checked inductivity of 522 backedges. 77 proven. 92 refuted. 0 times theorem prover too weak. 353 trivial. 0 not checked. [2020-07-21 16:01:14,106 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:14,568 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:14,656 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:14,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:14,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:14,761 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:14,831 INFO L134 CoverageAnalysis]: Checked inductivity of 522 backedges. 77 proven. 97 refuted. 0 times theorem prover too weak. 348 trivial. 0 not checked. [2020-07-21 16:01:14,832 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1925936048] [2020-07-21 16:01:14,832 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:14,832 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 16:01:14,832 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643812694] [2020-07-21 16:01:14,833 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 16:01:14,833 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:14,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 16:01:14,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 16:01:14,834 INFO L87 Difference]: Start difference. First operand 248 states and 431 transitions. Second operand 13 states. [2020-07-21 16:01:15,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:15,017 INFO L93 Difference]: Finished difference Result 281 states and 518 transitions. [2020-07-21 16:01:15,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:01:15,018 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 145 [2020-07-21 16:01:15,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:15,022 INFO L225 Difference]: With dead ends: 281 [2020-07-21 16:01:15,022 INFO L226 Difference]: Without dead ends: 277 [2020-07-21 16:01:15,023 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 270 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:01:15,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 277 states. [2020-07-21 16:01:15,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 277 to 248. [2020-07-21 16:01:15,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2020-07-21 16:01:15,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 431 transitions. [2020-07-21 16:01:15,044 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 431 transitions. Word has length 145 [2020-07-21 16:01:15,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:15,044 INFO L479 AbstractCegarLoop]: Abstraction has 248 states and 431 transitions. [2020-07-21 16:01:15,045 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 16:01:15,045 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 431 transitions. [2020-07-21 16:01:15,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2020-07-21 16:01:15,049 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:15,049 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:15,264 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:15,265 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:15,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:15,266 INFO L82 PathProgramCache]: Analyzing trace with hash 247206723, now seen corresponding path program 13 times [2020-07-21 16:01:15,266 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:15,266 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [596982079] [2020-07-21 16:01:15,266 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:15,440 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:15,440 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:15,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:01:15,443 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:15,503 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 134 proven. 31 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-21 16:01:15,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:15,907 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:15,908 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:16,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:16,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:16,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:16,313 INFO L134 CoverageAnalysis]: Checked inductivity of 510 backedges. 136 proven. 34 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-07-21 16:01:16,314 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [596982079] [2020-07-21 16:01:16,314 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:16,315 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 16:01:16,315 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1686809857] [2020-07-21 16:01:16,315 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 16:01:16,315 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:16,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 16:01:16,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 16:01:16,316 INFO L87 Difference]: Start difference. First operand 248 states and 431 transitions. Second operand 13 states. [2020-07-21 16:01:16,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:16,471 INFO L93 Difference]: Finished difference Result 261 states and 450 transitions. [2020-07-21 16:01:16,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:01:16,471 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 145 [2020-07-21 16:01:16,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:16,478 INFO L225 Difference]: With dead ends: 261 [2020-07-21 16:01:16,478 INFO L226 Difference]: Without dead ends: 257 [2020-07-21 16:01:16,478 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 270 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:01:16,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2020-07-21 16:01:16,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 248. [2020-07-21 16:01:16,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2020-07-21 16:01:16,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 431 transitions. [2020-07-21 16:01:16,495 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 431 transitions. Word has length 145 [2020-07-21 16:01:16,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:16,495 INFO L479 AbstractCegarLoop]: Abstraction has 248 states and 431 transitions. [2020-07-21 16:01:16,496 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 16:01:16,496 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 431 transitions. [2020-07-21 16:01:16,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2020-07-21 16:01:16,499 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:16,499 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 8, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:16,712 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:16,713 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:16,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:16,713 INFO L82 PathProgramCache]: Analyzing trace with hash -713059513, now seen corresponding path program 3 times [2020-07-21 16:01:16,713 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:16,713 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1749405523] [2020-07-21 16:01:16,713 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:16,896 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:16,896 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:16,898 INFO L263 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:01:16,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:17,006 INFO L134 CoverageAnalysis]: Checked inductivity of 739 backedges. 434 proven. 86 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-21 16:01:17,007 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:17,874 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:17,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:17,920 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:18,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:18,317 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:18,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:18,421 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:18,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:18,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:18,573 INFO L134 CoverageAnalysis]: Checked inductivity of 739 backedges. 99 proven. 235 refuted. 0 times theorem prover too weak. 405 trivial. 0 not checked. [2020-07-21 16:01:18,574 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1749405523] [2020-07-21 16:01:18,574 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:18,574 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 19 [2020-07-21 16:01:18,574 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241309339] [2020-07-21 16:01:18,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:01:18,575 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:18,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:01:18,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:01:18,576 INFO L87 Difference]: Start difference. First operand 248 states and 431 transitions. Second operand 19 states. [2020-07-21 16:01:19,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:19,214 INFO L93 Difference]: Finished difference Result 527 states and 947 transitions. [2020-07-21 16:01:19,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 16:01:19,215 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 171 [2020-07-21 16:01:19,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:19,218 INFO L225 Difference]: With dead ends: 527 [2020-07-21 16:01:19,218 INFO L226 Difference]: Without dead ends: 285 [2020-07-21 16:01:19,220 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 353 GetRequests, 312 SyntacticMatches, 13 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=162, Invalid=708, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:01:19,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2020-07-21 16:01:19,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 251. [2020-07-21 16:01:19,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 251 states. [2020-07-21 16:01:19,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 436 transitions. [2020-07-21 16:01:19,240 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 436 transitions. Word has length 171 [2020-07-21 16:01:19,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:19,241 INFO L479 AbstractCegarLoop]: Abstraction has 251 states and 436 transitions. [2020-07-21 16:01:19,241 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:01:19,241 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 436 transitions. [2020-07-21 16:01:19,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2020-07-21 16:01:19,245 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:19,245 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:19,459 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:19,460 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:19,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:19,460 INFO L82 PathProgramCache]: Analyzing trace with hash -754125023, now seen corresponding path program 4 times [2020-07-21 16:01:19,460 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:19,461 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2041328245] [2020-07-21 16:01:19,461 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:19,651 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:19,651 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:19,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 378 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:01:19,656 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:19,743 INFO L134 CoverageAnalysis]: Checked inductivity of 726 backedges. 45 proven. 235 refuted. 0 times theorem prover too weak. 446 trivial. 0 not checked. [2020-07-21 16:01:19,743 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:20,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:21,072 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:21,243 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:21,244 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:21,339 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:21,386 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:21,387 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:21,437 INFO L134 CoverageAnalysis]: Checked inductivity of 726 backedges. 45 proven. 249 refuted. 0 times theorem prover too weak. 432 trivial. 0 not checked. [2020-07-21 16:01:21,437 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2041328245] [2020-07-21 16:01:21,437 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:21,437 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 16:01:21,437 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613216270] [2020-07-21 16:01:21,438 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:01:21,438 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:21,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:01:21,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:01:21,439 INFO L87 Difference]: Start difference. First operand 251 states and 436 transitions. Second operand 17 states. [2020-07-21 16:01:21,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:21,711 INFO L93 Difference]: Finished difference Result 271 states and 478 transitions. [2020-07-21 16:01:21,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:01:21,712 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 169 [2020-07-21 16:01:21,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:21,715 INFO L225 Difference]: With dead ends: 271 [2020-07-21 16:01:21,715 INFO L226 Difference]: Without dead ends: 267 [2020-07-21 16:01:21,718 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 345 GetRequests, 311 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:01:21,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 267 states. [2020-07-21 16:01:21,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 267 to 246. [2020-07-21 16:01:21,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 246 states. [2020-07-21 16:01:21,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 425 transitions. [2020-07-21 16:01:21,742 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 425 transitions. Word has length 169 [2020-07-21 16:01:21,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:21,743 INFO L479 AbstractCegarLoop]: Abstraction has 246 states and 425 transitions. [2020-07-21 16:01:21,743 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:01:21,743 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 425 transitions. [2020-07-21 16:01:21,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2020-07-21 16:01:21,746 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:21,746 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 8, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:21,961 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:21,962 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:21,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:21,963 INFO L82 PathProgramCache]: Analyzing trace with hash -755103851, now seen corresponding path program 14 times [2020-07-21 16:01:21,963 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:21,963 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1941706597] [2020-07-21 16:01:21,963 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:22,167 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:22,167 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:22,169 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:01:22,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:22,336 INFO L134 CoverageAnalysis]: Checked inductivity of 745 backedges. 452 proven. 91 refuted. 0 times theorem prover too weak. 202 trivial. 0 not checked. [2020-07-21 16:01:22,336 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:23,400 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:23,401 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:23,463 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:23,921 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,021 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:24,132 INFO L134 CoverageAnalysis]: Checked inductivity of 745 backedges. 118 proven. 262 refuted. 0 times theorem prover too weak. 365 trivial. 0 not checked. [2020-07-21 16:01:24,133 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1941706597] [2020-07-21 16:01:24,133 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:24,133 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-21 16:01:24,133 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1142078200] [2020-07-21 16:01:24,134 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:01:24,134 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:24,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:01:24,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=360, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:01:24,135 INFO L87 Difference]: Start difference. First operand 246 states and 425 transitions. Second operand 21 states. [2020-07-21 16:01:24,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:24,757 INFO L93 Difference]: Finished difference Result 487 states and 885 transitions. [2020-07-21 16:01:24,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 16:01:24,758 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 172 [2020-07-21 16:01:24,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:24,761 INFO L225 Difference]: With dead ends: 487 [2020-07-21 16:01:24,761 INFO L226 Difference]: Without dead ends: 244 [2020-07-21 16:01:24,764 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 356 GetRequests, 310 SyntacticMatches, 15 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=186, Invalid=870, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 16:01:24,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2020-07-21 16:01:24,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 236. [2020-07-21 16:01:24,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 236 states. [2020-07-21 16:01:24,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 236 states to 236 states and 398 transitions. [2020-07-21 16:01:24,783 INFO L78 Accepts]: Start accepts. Automaton has 236 states and 398 transitions. Word has length 172 [2020-07-21 16:01:24,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:24,783 INFO L479 AbstractCegarLoop]: Abstraction has 236 states and 398 transitions. [2020-07-21 16:01:24,783 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:01:24,783 INFO L276 IsEmpty]: Start isEmpty. Operand 236 states and 398 transitions. [2020-07-21 16:01:24,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2020-07-21 16:01:24,787 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:24,787 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 10, 10, 9, 8, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:25,000 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:25,001 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:25,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:25,002 INFO L82 PathProgramCache]: Analyzing trace with hash 1102006884, now seen corresponding path program 15 times [2020-07-21 16:01:25,002 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:25,002 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2002663009] [2020-07-21 16:01:25,002 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:25,190 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:25,190 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:25,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 16:01:25,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:25,355 INFO L134 CoverageAnalysis]: Checked inductivity of 656 backedges. 168 proven. 206 refuted. 0 times theorem prover too weak. 282 trivial. 0 not checked. [2020-07-21 16:01:25,355 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:26,288 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:26,289 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:26,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:26,511 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:26,511 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:27,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:27,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:27,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:27,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:27,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:27,462 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:27,518 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:27,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:27,589 INFO L134 CoverageAnalysis]: Checked inductivity of 656 backedges. 168 proven. 220 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2020-07-21 16:01:27,590 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2002663009] [2020-07-21 16:01:27,590 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:27,591 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-21 16:01:27,591 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [701546794] [2020-07-21 16:01:27,591 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:01:27,591 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:27,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:01:27,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=521, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:01:27,592 INFO L87 Difference]: Start difference. First operand 236 states and 398 transitions. Second operand 25 states. [2020-07-21 16:01:28,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:28,528 INFO L93 Difference]: Finished difference Result 497 states and 878 transitions. [2020-07-21 16:01:28,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-21 16:01:28,529 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 162 [2020-07-21 16:01:28,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:28,532 INFO L225 Difference]: With dead ends: 497 [2020-07-21 16:01:28,532 INFO L226 Difference]: Without dead ends: 266 [2020-07-21 16:01:28,534 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 281 SyntacticMatches, 19 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=263, Invalid=1297, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 16:01:28,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2020-07-21 16:01:28,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 244. [2020-07-21 16:01:28,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 244 states. [2020-07-21 16:01:28,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 390 transitions. [2020-07-21 16:01:28,549 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 390 transitions. Word has length 162 [2020-07-21 16:01:28,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:28,549 INFO L479 AbstractCegarLoop]: Abstraction has 244 states and 390 transitions. [2020-07-21 16:01:28,549 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:01:28,550 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 390 transitions. [2020-07-21 16:01:28,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2020-07-21 16:01:28,552 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:28,552 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 11, 10, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:28,765 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:28,766 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:28,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:28,767 INFO L82 PathProgramCache]: Analyzing trace with hash -1935704345, now seen corresponding path program 16 times [2020-07-21 16:01:28,767 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:28,767 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1167639394] [2020-07-21 16:01:28,768 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:29,009 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:29,010 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:29,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:01:29,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:29,206 INFO L134 CoverageAnalysis]: Checked inductivity of 1052 backedges. 604 proven. 141 refuted. 0 times theorem prover too weak. 307 trivial. 0 not checked. [2020-07-21 16:01:29,206 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:30,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:30,331 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:30,383 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:30,787 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:30,883 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:30,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:30,937 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:30,996 INFO L134 CoverageAnalysis]: Checked inductivity of 1052 backedges. 156 proven. 325 refuted. 0 times theorem prover too weak. 571 trivial. 0 not checked. [2020-07-21 16:01:30,996 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1167639394] [2020-07-21 16:01:30,996 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:30,997 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-21 16:01:30,997 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210624737] [2020-07-21 16:01:30,997 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:01:30,998 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:30,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:01:30,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:01:30,998 INFO L87 Difference]: Start difference. First operand 244 states and 390 transitions. Second operand 21 states. [2020-07-21 16:01:31,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:31,722 INFO L93 Difference]: Finished difference Result 508 states and 827 transitions. [2020-07-21 16:01:31,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 16:01:31,723 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 202 [2020-07-21 16:01:31,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:31,728 INFO L225 Difference]: With dead ends: 508 [2020-07-21 16:01:31,728 INFO L226 Difference]: Without dead ends: 270 [2020-07-21 16:01:31,732 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 369 SyntacticMatches, 15 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=219, Invalid=971, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 16:01:31,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 270 states. [2020-07-21 16:01:31,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 270 to 244. [2020-07-21 16:01:31,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 244 states. [2020-07-21 16:01:31,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 389 transitions. [2020-07-21 16:01:31,750 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 389 transitions. Word has length 202 [2020-07-21 16:01:31,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:31,751 INFO L479 AbstractCegarLoop]: Abstraction has 244 states and 389 transitions. [2020-07-21 16:01:31,751 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:01:31,751 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 389 transitions. [2020-07-21 16:01:31,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2020-07-21 16:01:31,754 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:31,755 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 11, 10, 8, 8, 8, 8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 6, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:31,967 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:31,968 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:31,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:31,969 INFO L82 PathProgramCache]: Analyzing trace with hash 2083859482, now seen corresponding path program 17 times [2020-07-21 16:01:31,969 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:31,969 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [619292787] [2020-07-21 16:01:31,969 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:32,261 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:32,262 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:32,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 16:01:32,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:32,431 INFO L134 CoverageAnalysis]: Checked inductivity of 1196 backedges. 234 proven. 341 refuted. 0 times theorem prover too weak. 621 trivial. 0 not checked. [2020-07-21 16:01:32,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:33,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:33,532 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:33,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:33,666 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,362 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,539 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,709 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,709 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:34,780 INFO L134 CoverageAnalysis]: Checked inductivity of 1196 backedges. 234 proven. 356 refuted. 0 times theorem prover too weak. 606 trivial. 0 not checked. [2020-07-21 16:01:34,780 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [619292787] [2020-07-21 16:01:34,781 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:34,781 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-21 16:01:34,781 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550619281] [2020-07-21 16:01:34,781 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:01:34,781 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:34,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:01:34,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:01:34,782 INFO L87 Difference]: Start difference. First operand 244 states and 389 transitions. Second operand 25 states. [2020-07-21 16:01:36,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:36,182 INFO L93 Difference]: Finished difference Result 588 states and 1005 transitions. [2020-07-21 16:01:36,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-07-21 16:01:36,183 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 214 [2020-07-21 16:01:36,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:36,188 INFO L225 Difference]: With dead ends: 588 [2020-07-21 16:01:36,188 INFO L226 Difference]: Without dead ends: 305 [2020-07-21 16:01:36,191 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 448 GetRequests, 385 SyntacticMatches, 19 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 362 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=348, Invalid=1722, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 16:01:36,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2020-07-21 16:01:36,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 268. [2020-07-21 16:01:36,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 268 states. [2020-07-21 16:01:36,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 421 transitions. [2020-07-21 16:01:36,210 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 421 transitions. Word has length 214 [2020-07-21 16:01:36,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:36,210 INFO L479 AbstractCegarLoop]: Abstraction has 268 states and 421 transitions. [2020-07-21 16:01:36,210 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:01:36,210 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 421 transitions. [2020-07-21 16:01:36,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-07-21 16:01:36,213 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:36,213 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 13, 13, 10, 10, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:36,414 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:36,414 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:36,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:36,415 INFO L82 PathProgramCache]: Analyzing trace with hash -2099788343, now seen corresponding path program 18 times [2020-07-21 16:01:36,415 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:36,416 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1260237798] [2020-07-21 16:01:36,416 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:36,688 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:36,688 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:36,690 INFO L263 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 16:01:36,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:36,856 INFO L134 CoverageAnalysis]: Checked inductivity of 1054 backedges. 622 proven. 124 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2020-07-21 16:01:36,857 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:38,140 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:38,235 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:38,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:38,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:38,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:38,879 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:38,985 INFO L134 CoverageAnalysis]: Checked inductivity of 1054 backedges. 132 proven. 356 refuted. 0 times theorem prover too weak. 566 trivial. 0 not checked. [2020-07-21 16:01:38,986 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1260237798] [2020-07-21 16:01:38,986 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:38,986 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 18] total 23 [2020-07-21 16:01:38,987 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1417314272] [2020-07-21 16:01:38,989 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:01:38,989 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:38,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:01:38,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=436, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:01:38,990 INFO L87 Difference]: Start difference. First operand 268 states and 421 transitions. Second operand 23 states. [2020-07-21 16:01:39,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:39,993 INFO L93 Difference]: Finished difference Result 524 states and 862 transitions. [2020-07-21 16:01:39,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-21 16:01:39,994 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 201 [2020-07-21 16:01:39,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:39,996 INFO L225 Difference]: With dead ends: 524 [2020-07-21 16:01:39,997 INFO L226 Difference]: Without dead ends: 260 [2020-07-21 16:01:39,999 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 418 GetRequests, 365 SyntacticMatches, 15 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=291, Invalid=1269, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 16:01:39,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 260 states. [2020-07-21 16:01:40,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 260 to 231. [2020-07-21 16:01:40,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 231 states. [2020-07-21 16:01:40,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 351 transitions. [2020-07-21 16:01:40,014 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 351 transitions. Word has length 201 [2020-07-21 16:01:40,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:40,014 INFO L479 AbstractCegarLoop]: Abstraction has 231 states and 351 transitions. [2020-07-21 16:01:40,014 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:01:40,015 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 351 transitions. [2020-07-21 16:01:40,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2020-07-21 16:01:40,017 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:40,017 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 10, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:40,231 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:40,232 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:40,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:40,233 INFO L82 PathProgramCache]: Analyzing trace with hash 307857833, now seen corresponding path program 19 times [2020-07-21 16:01:40,233 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:40,233 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1146731108] [2020-07-21 16:01:40,233 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:40,504 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:40,504 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:40,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 103 conjunts are in the unsatisfiable core [2020-07-21 16:01:40,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:41,037 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 0 proven. 267 refuted. 0 times theorem prover too weak. 519 trivial. 0 not checked. [2020-07-21 16:01:41,038 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:43,168 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 0 proven. 267 refuted. 0 times theorem prover too weak. 519 trivial. 0 not checked. [2020-07-21 16:01:43,169 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1146731108] [2020-07-21 16:01:43,169 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:43,169 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 36 [2020-07-21 16:01:43,169 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195507539] [2020-07-21 16:01:43,170 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-21 16:01:43,170 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:43,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-21 16:01:43,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1175, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 16:01:43,171 INFO L87 Difference]: Start difference. First operand 231 states and 351 transitions. Second operand 36 states. [2020-07-21 16:01:43,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:43,747 INFO L93 Difference]: Finished difference Result 253 states and 392 transitions. [2020-07-21 16:01:43,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-21 16:01:43,748 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 177 [2020-07-21 16:01:43,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:43,751 INFO L225 Difference]: With dead ends: 253 [2020-07-21 16:01:43,751 INFO L226 Difference]: Without dead ends: 249 [2020-07-21 16:01:43,752 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 353 GetRequests, 319 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=85, Invalid=1175, Unknown=0, NotChecked=0, Total=1260 [2020-07-21 16:01:43,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2020-07-21 16:01:43,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 244. [2020-07-21 16:01:43,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 244 states. [2020-07-21 16:01:43,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 381 transitions. [2020-07-21 16:01:43,767 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 381 transitions. Word has length 177 [2020-07-21 16:01:43,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:43,767 INFO L479 AbstractCegarLoop]: Abstraction has 244 states and 381 transitions. [2020-07-21 16:01:43,767 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-21 16:01:43,768 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 381 transitions. [2020-07-21 16:01:43,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-21 16:01:43,770 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:43,770 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 10, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:43,983 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:43,984 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:43,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:43,985 INFO L82 PathProgramCache]: Analyzing trace with hash -140375518, now seen corresponding path program 20 times [2020-07-21 16:01:43,985 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:43,985 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1556588663] [2020-07-21 16:01:43,985 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:44,269 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:44,269 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:44,271 INFO L263 TraceCheckSpWp]: Trace formula consists of 421 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 16:01:44,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:44,485 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 180 proven. 268 refuted. 0 times theorem prover too weak. 470 trivial. 0 not checked. [2020-07-21 16:01:44,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:45,327 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:45,415 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:45,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:46,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:46,184 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:46,373 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:46,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:46,482 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:46,545 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:46,614 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 179 proven. 280 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2020-07-21 16:01:46,614 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1556588663] [2020-07-21 16:01:46,614 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:46,615 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 20] total 25 [2020-07-21 16:01:46,615 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998637640] [2020-07-21 16:01:46,615 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:01:46,615 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:46,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:01:46,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=520, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:01:46,616 INFO L87 Difference]: Start difference. First operand 244 states and 381 transitions. Second operand 25 states. [2020-07-21 16:01:47,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:47,562 INFO L93 Difference]: Finished difference Result 496 states and 794 transitions. [2020-07-21 16:01:47,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 16:01:47,563 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 189 [2020-07-21 16:01:47,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:47,566 INFO L225 Difference]: With dead ends: 496 [2020-07-21 16:01:47,566 INFO L226 Difference]: Without dead ends: 258 [2020-07-21 16:01:47,568 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 396 GetRequests, 337 SyntacticMatches, 17 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 307 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=348, Invalid=1544, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 16:01:47,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2020-07-21 16:01:47,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 247. [2020-07-21 16:01:47,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 247 states. [2020-07-21 16:01:47,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 387 transitions. [2020-07-21 16:01:47,585 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 387 transitions. Word has length 189 [2020-07-21 16:01:47,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:47,585 INFO L479 AbstractCegarLoop]: Abstraction has 247 states and 387 transitions. [2020-07-21 16:01:47,586 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:01:47,586 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 387 transitions. [2020-07-21 16:01:47,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2020-07-21 16:01:47,588 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:47,589 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 10, 10, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:47,802 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:47,803 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:47,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:47,804 INFO L82 PathProgramCache]: Analyzing trace with hash 1838391522, now seen corresponding path program 21 times [2020-07-21 16:01:47,804 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:47,804 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [191029046] [2020-07-21 16:01:47,805 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:48,144 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:48,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:48,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 421 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 16:01:48,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:48,348 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 167 proven. 281 refuted. 0 times theorem prover too weak. 470 trivial. 0 not checked. [2020-07-21 16:01:48,348 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:49,231 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:49,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:49,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:49,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:49,404 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:50,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:50,304 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:50,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:50,489 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:50,568 INFO L134 CoverageAnalysis]: Checked inductivity of 918 backedges. 166 proven. 293 refuted. 0 times theorem prover too weak. 459 trivial. 0 not checked. [2020-07-21 16:01:50,568 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [191029046] [2020-07-21 16:01:50,568 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:50,568 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 20] total 25 [2020-07-21 16:01:50,569 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069322484] [2020-07-21 16:01:50,569 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:01:50,569 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:50,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:01:50,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=520, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:01:50,570 INFO L87 Difference]: Start difference. First operand 247 states and 387 transitions. Second operand 25 states. [2020-07-21 16:01:51,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:51,831 INFO L93 Difference]: Finished difference Result 493 states and 795 transitions. [2020-07-21 16:01:51,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-21 16:01:51,834 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 189 [2020-07-21 16:01:51,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:51,836 INFO L225 Difference]: With dead ends: 493 [2020-07-21 16:01:51,837 INFO L226 Difference]: Without dead ends: 252 [2020-07-21 16:01:51,839 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 337 SyntacticMatches, 17 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 346 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=371, Invalid=1699, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 16:01:51,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2020-07-21 16:01:51,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 239. [2020-07-21 16:01:51,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 239 states. [2020-07-21 16:01:51,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 365 transitions. [2020-07-21 16:01:51,854 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 365 transitions. Word has length 189 [2020-07-21 16:01:51,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:51,854 INFO L479 AbstractCegarLoop]: Abstraction has 239 states and 365 transitions. [2020-07-21 16:01:51,854 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:01:51,854 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 365 transitions. [2020-07-21 16:01:51,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2020-07-21 16:01:51,856 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:51,856 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 16, 16, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 8, 8, 8, 8, 8, 8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:52,056 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:52,057 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:52,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:52,058 INFO L82 PathProgramCache]: Analyzing trace with hash 2146047195, now seen corresponding path program 5 times [2020-07-21 16:01:52,058 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:52,059 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [445588723] [2020-07-21 16:01:52,059 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:52,388 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:01:52,388 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:52,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 16:01:52,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:52,489 INFO L134 CoverageAnalysis]: Checked inductivity of 1702 backedges. 637 proven. 11 refuted. 0 times theorem prover too weak. 1054 trivial. 0 not checked. [2020-07-21 16:01:52,489 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:53,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:53,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:54,141 INFO L134 CoverageAnalysis]: Checked inductivity of 1702 backedges. 120 proven. 326 refuted. 0 times theorem prover too weak. 1256 trivial. 0 not checked. [2020-07-21 16:01:54,144 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [445588723] [2020-07-21 16:01:54,144 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:54,144 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2020-07-21 16:01:54,144 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1100348072] [2020-07-21 16:01:54,145 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:01:54,145 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:54,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:01:54,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:01:54,146 INFO L87 Difference]: Start difference. First operand 239 states and 365 transitions. Second operand 14 states. [2020-07-21 16:01:54,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:01:54,461 INFO L93 Difference]: Finished difference Result 449 states and 700 transitions. [2020-07-21 16:01:54,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:01:54,463 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 249 [2020-07-21 16:01:54,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:01:54,467 INFO L225 Difference]: With dead ends: 449 [2020-07-21 16:01:54,467 INFO L226 Difference]: Without dead ends: 216 [2020-07-21 16:01:54,470 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 502 GetRequests, 478 SyntacticMatches, 7 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=74, Invalid=268, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:01:54,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2020-07-21 16:01:54,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 216. [2020-07-21 16:01:54,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2020-07-21 16:01:54,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 323 transitions. [2020-07-21 16:01:54,489 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 323 transitions. Word has length 249 [2020-07-21 16:01:54,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:01:54,490 INFO L479 AbstractCegarLoop]: Abstraction has 216 states and 323 transitions. [2020-07-21 16:01:54,490 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:01:54,490 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 323 transitions. [2020-07-21 16:01:54,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 477 [2020-07-21 16:01:54,497 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:01:54,498 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 34, 34, 23, 20, 18, 18, 18, 18, 18, 18, 18, 17, 17, 17, 17, 17, 17, 17, 14, 14, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:01:54,715 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:54,716 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:01:54,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:01:54,716 INFO L82 PathProgramCache]: Analyzing trace with hash -2026726594, now seen corresponding path program 22 times [2020-07-21 16:01:54,716 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:01:54,716 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [504734815] [2020-07-21 16:01:54,717 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:01:55,103 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:01:55,103 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:01:55,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 703 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 16:01:55,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:01:55,336 INFO L134 CoverageAnalysis]: Checked inductivity of 6507 backedges. 3642 proven. 305 refuted. 0 times theorem prover too weak. 2560 trivial. 0 not checked. [2020-07-21 16:01:55,336 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:01:57,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:57,983 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:58,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:58,308 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:58,309 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:58,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:58,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:58,844 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:58,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:58,907 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:58,986 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:01:59,155 INFO L134 CoverageAnalysis]: Checked inductivity of 6507 backedges. 423 proven. 1104 refuted. 0 times theorem prover too weak. 4980 trivial. 0 not checked. [2020-07-21 16:01:59,155 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [504734815] [2020-07-21 16:01:59,156 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:01:59,156 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19] total 25 [2020-07-21 16:01:59,156 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797979458] [2020-07-21 16:01:59,157 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:01:59,157 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:01:59,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:01:59,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=523, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:01:59,158 INFO L87 Difference]: Start difference. First operand 216 states and 323 transitions. Second operand 25 states. [2020-07-21 16:02:00,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:00,491 INFO L93 Difference]: Finished difference Result 527 states and 870 transitions. [2020-07-21 16:02:00,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-07-21 16:02:00,492 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 476 [2020-07-21 16:02:00,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:00,496 INFO L225 Difference]: With dead ends: 527 [2020-07-21 16:02:00,496 INFO L226 Difference]: Without dead ends: 286 [2020-07-21 16:02:00,499 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 972 GetRequests, 913 SyntacticMatches, 15 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 355 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=354, Invalid=1716, Unknown=0, NotChecked=0, Total=2070 [2020-07-21 16:02:00,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2020-07-21 16:02:00,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 254. [2020-07-21 16:02:00,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254 states. [2020-07-21 16:02:00,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 402 transitions. [2020-07-21 16:02:00,516 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 402 transitions. Word has length 476 [2020-07-21 16:02:00,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:00,516 INFO L479 AbstractCegarLoop]: Abstraction has 254 states and 402 transitions. [2020-07-21 16:02:00,516 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:02:00,516 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 402 transitions. [2020-07-21 16:02:00,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2020-07-21 16:02:00,519 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:00,520 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 14, 14, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 7, 7, 7, 7, 7, 7, 7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:00,734 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:00,735 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:00,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:00,736 INFO L82 PathProgramCache]: Analyzing trace with hash -681984220, now seen corresponding path program 6 times [2020-07-21 16:02:00,736 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:00,736 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [413005663] [2020-07-21 16:02:00,737 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:01,078 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:01,078 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:01,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 529 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 16:02:01,085 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:01,246 INFO L134 CoverageAnalysis]: Checked inductivity of 1558 backedges. 820 proven. 51 refuted. 0 times theorem prover too weak. 687 trivial. 0 not checked. [2020-07-21 16:02:01,246 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:02,481 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:02,888 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:02,889 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:02,986 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:03,125 INFO L134 CoverageAnalysis]: Checked inductivity of 1558 backedges. 147 proven. 371 refuted. 0 times theorem prover too weak. 1040 trivial. 0 not checked. [2020-07-21 16:02:03,126 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [413005663] [2020-07-21 16:02:03,126 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:03,126 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 19 [2020-07-21 16:02:03,126 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534238885] [2020-07-21 16:02:03,127 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:02:03,127 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:03,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:02:03,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:02:03,127 INFO L87 Difference]: Start difference. First operand 254 states and 402 transitions. Second operand 19 states. [2020-07-21 16:02:03,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:03,625 INFO L93 Difference]: Finished difference Result 480 states and 777 transitions. [2020-07-21 16:02:03,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 16:02:03,626 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 237 [2020-07-21 16:02:03,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:03,631 INFO L225 Difference]: With dead ends: 480 [2020-07-21 16:02:03,631 INFO L226 Difference]: Without dead ends: 232 [2020-07-21 16:02:03,633 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 485 GetRequests, 446 SyntacticMatches, 11 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=168, Invalid=702, Unknown=0, NotChecked=0, Total=870 [2020-07-21 16:02:03,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2020-07-21 16:02:03,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 230. [2020-07-21 16:02:03,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 230 states. [2020-07-21 16:02:03,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 354 transitions. [2020-07-21 16:02:03,648 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 354 transitions. Word has length 237 [2020-07-21 16:02:03,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:03,648 INFO L479 AbstractCegarLoop]: Abstraction has 230 states and 354 transitions. [2020-07-21 16:02:03,648 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:02:03,649 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 354 transitions. [2020-07-21 16:02:03,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 364 [2020-07-21 16:02:03,651 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:03,652 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 25, 25, 19, 19, 14, 14, 14, 14, 14, 14, 14, 12, 12, 12, 12, 12, 12, 12, 9, 7, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:03,864 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:03,865 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:03,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:03,866 INFO L82 PathProgramCache]: Analyzing trace with hash -1493839085, now seen corresponding path program 23 times [2020-07-21 16:02:03,866 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:03,867 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1410728936] [2020-07-21 16:02:03,867 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:04,224 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:04,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:04,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 543 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 16:02:04,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:04,588 INFO L134 CoverageAnalysis]: Checked inductivity of 3682 backedges. 2061 proven. 390 refuted. 0 times theorem prover too weak. 1231 trivial. 0 not checked. [2020-07-21 16:02:04,589 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:07,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:07,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:07,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:07,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:07,624 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:07,696 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:08,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:08,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:08,820 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:08,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:08,889 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:09,020 INFO L134 CoverageAnalysis]: Checked inductivity of 3682 backedges. 302 proven. 1003 refuted. 0 times theorem prover too weak. 2377 trivial. 0 not checked. [2020-07-21 16:02:09,021 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1410728936] [2020-07-21 16:02:09,021 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:09,021 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 23] total 29 [2020-07-21 16:02:09,021 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794777279] [2020-07-21 16:02:09,022 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 16:02:09,022 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:09,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 16:02:09,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=716, Unknown=0, NotChecked=0, Total=812 [2020-07-21 16:02:09,023 INFO L87 Difference]: Start difference. First operand 230 states and 354 transitions. Second operand 29 states. [2020-07-21 16:02:10,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:10,391 INFO L93 Difference]: Finished difference Result 521 states and 875 transitions. [2020-07-21 16:02:10,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 16:02:10,392 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 363 [2020-07-21 16:02:10,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:10,395 INFO L225 Difference]: With dead ends: 521 [2020-07-21 16:02:10,396 INFO L226 Difference]: Without dead ends: 297 [2020-07-21 16:02:10,399 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 743 GetRequests, 679 SyntacticMatches, 19 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 391 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=341, Invalid=1821, Unknown=0, NotChecked=0, Total=2162 [2020-07-21 16:02:10,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 297 states. [2020-07-21 16:02:10,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 297 to 247. [2020-07-21 16:02:10,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 247 states. [2020-07-21 16:02:10,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 394 transitions. [2020-07-21 16:02:10,417 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 394 transitions. Word has length 363 [2020-07-21 16:02:10,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:10,417 INFO L479 AbstractCegarLoop]: Abstraction has 247 states and 394 transitions. [2020-07-21 16:02:10,417 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 16:02:10,417 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 394 transitions. [2020-07-21 16:02:10,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 250 [2020-07-21 16:02:10,420 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:10,420 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 16, 16, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 8, 8, 8, 8, 8, 8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:10,622 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:10,623 INFO L427 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:10,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:10,624 INFO L82 PathProgramCache]: Analyzing trace with hash 1491534157, now seen corresponding path program 7 times [2020-07-21 16:02:10,624 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:10,625 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [530405774] [2020-07-21 16:02:10,625 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:10,999 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:10,999 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:11,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 16:02:11,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:11,177 INFO L134 CoverageAnalysis]: Checked inductivity of 1702 backedges. 981 proven. 177 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked. [2020-07-21 16:02:11,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:12,630 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:12,698 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:13,307 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:13,308 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:13,462 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:13,556 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:13,557 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:13,672 INFO L134 CoverageAnalysis]: Checked inductivity of 1702 backedges. 209 proven. 447 refuted. 0 times theorem prover too weak. 1046 trivial. 0 not checked. [2020-07-21 16:02:13,672 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [530405774] [2020-07-21 16:02:13,672 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:13,673 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 18] total 23 [2020-07-21 16:02:13,673 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2108310022] [2020-07-21 16:02:13,674 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 16:02:13,674 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:13,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 16:02:13,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=435, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:02:13,675 INFO L87 Difference]: Start difference. First operand 247 states and 394 transitions. Second operand 23 states. [2020-07-21 16:02:14,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:14,611 INFO L93 Difference]: Finished difference Result 481 states and 800 transitions. [2020-07-21 16:02:14,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 16:02:14,612 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 249 [2020-07-21 16:02:14,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:14,615 INFO L225 Difference]: With dead ends: 481 [2020-07-21 16:02:14,615 INFO L226 Difference]: Without dead ends: 239 [2020-07-21 16:02:14,617 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 512 GetRequests, 462 SyntacticMatches, 15 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 208 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=233, Invalid=1099, Unknown=0, NotChecked=0, Total=1332 [2020-07-21 16:02:14,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2020-07-21 16:02:14,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 231. [2020-07-21 16:02:14,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 231 states. [2020-07-21 16:02:14,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 363 transitions. [2020-07-21 16:02:14,631 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 363 transitions. Word has length 249 [2020-07-21 16:02:14,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:14,632 INFO L479 AbstractCegarLoop]: Abstraction has 231 states and 363 transitions. [2020-07-21 16:02:14,632 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 16:02:14,632 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 363 transitions. [2020-07-21 16:02:14,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 417 [2020-07-21 16:02:14,635 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:14,636 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 29, 29, 20, 17, 17, 17, 17, 17, 17, 17, 17, 14, 14, 14, 14, 14, 14, 14, 14, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:14,850 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:14,851 INFO L427 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:14,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:14,852 INFO L82 PathProgramCache]: Analyzing trace with hash 969019326, now seen corresponding path program 5 times [2020-07-21 16:02:14,852 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:14,852 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1601983428] [2020-07-21 16:02:14,853 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:15,278 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:15,279 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:15,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 929 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:02:15,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:15,428 INFO L134 CoverageAnalysis]: Checked inductivity of 5003 backedges. 326 proven. 596 refuted. 0 times theorem prover too weak. 4081 trivial. 0 not checked. [2020-07-21 16:02:15,429 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:17,321 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:17,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:17,615 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:17,842 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:17,843 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:17,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:18,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:18,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:18,404 INFO L134 CoverageAnalysis]: Checked inductivity of 5003 backedges. 326 proven. 610 refuted. 0 times theorem prover too weak. 4067 trivial. 0 not checked. [2020-07-21 16:02:18,404 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1601983428] [2020-07-21 16:02:18,405 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:18,405 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 16:02:18,405 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572979904] [2020-07-21 16:02:18,406 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:02:18,406 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:18,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:02:18,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:02:18,406 INFO L87 Difference]: Start difference. First operand 231 states and 363 transitions. Second operand 17 states. [2020-07-21 16:02:18,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:18,772 INFO L93 Difference]: Finished difference Result 245 states and 399 transitions. [2020-07-21 16:02:18,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 16:02:18,773 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 416 [2020-07-21 16:02:18,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:18,776 INFO L225 Difference]: With dead ends: 245 [2020-07-21 16:02:18,776 INFO L226 Difference]: Without dead ends: 231 [2020-07-21 16:02:18,777 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 838 GetRequests, 804 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 16:02:18,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2020-07-21 16:02:18,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 211. [2020-07-21 16:02:18,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 211 states. [2020-07-21 16:02:18,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 304 transitions. [2020-07-21 16:02:18,788 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 304 transitions. Word has length 416 [2020-07-21 16:02:18,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:18,788 INFO L479 AbstractCegarLoop]: Abstraction has 211 states and 304 transitions. [2020-07-21 16:02:18,788 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:02:18,789 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 304 transitions. [2020-07-21 16:02:18,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 412 [2020-07-21 16:02:18,792 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:18,792 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 30, 30, 19, 19, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 12, 11, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:19,006 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:19,007 INFO L427 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:19,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:19,008 INFO L82 PathProgramCache]: Analyzing trace with hash -131280481, now seen corresponding path program 24 times [2020-07-21 16:02:19,008 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:19,008 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1871919103] [2020-07-21 16:02:19,009 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:19,416 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:19,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:19,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 612 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 16:02:19,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:19,792 INFO L134 CoverageAnalysis]: Checked inductivity of 4782 backedges. 573 proven. 1206 refuted. 0 times theorem prover too weak. 3003 trivial. 0 not checked. [2020-07-21 16:02:19,792 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:22,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:22,810 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:23,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:23,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:23,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:23,903 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:24,033 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:24,034 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:24,152 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:25,429 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:25,762 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:25,974 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:25,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:26,102 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:26,103 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:26,179 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:26,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:26,314 INFO L134 CoverageAnalysis]: Checked inductivity of 4782 backedges. 573 proven. 1244 refuted. 0 times theorem prover too weak. 2965 trivial. 0 not checked. [2020-07-21 16:02:26,315 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1871919103] [2020-07-21 16:02:26,315 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:26,315 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 29] total 35 [2020-07-21 16:02:26,315 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278161544] [2020-07-21 16:02:26,316 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-21 16:02:26,316 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:26,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-21 16:02:26,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1062, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 16:02:26,316 INFO L87 Difference]: Start difference. First operand 211 states and 304 transitions. Second operand 35 states. [2020-07-21 16:02:28,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:28,756 INFO L93 Difference]: Finished difference Result 492 states and 796 transitions. [2020-07-21 16:02:28,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-07-21 16:02:28,757 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 411 [2020-07-21 16:02:28,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:28,759 INFO L225 Difference]: With dead ends: 492 [2020-07-21 16:02:28,760 INFO L226 Difference]: Without dead ends: 254 [2020-07-21 16:02:28,763 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 853 GetRequests, 763 SyntacticMatches, 25 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 972 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=658, Invalid=3764, Unknown=0, NotChecked=0, Total=4422 [2020-07-21 16:02:28,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2020-07-21 16:02:28,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 223. [2020-07-21 16:02:28,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 223 states. [2020-07-21 16:02:28,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 223 states to 223 states and 313 transitions. [2020-07-21 16:02:28,775 INFO L78 Accepts]: Start accepts. Automaton has 223 states and 313 transitions. Word has length 411 [2020-07-21 16:02:28,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:28,776 INFO L479 AbstractCegarLoop]: Abstraction has 223 states and 313 transitions. [2020-07-21 16:02:28,776 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-21 16:02:28,776 INFO L276 IsEmpty]: Start isEmpty. Operand 223 states and 313 transitions. [2020-07-21 16:02:28,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 344 [2020-07-21 16:02:28,779 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:28,779 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 15, 15, 13, 13, 13, 13, 13, 13, 13, 12, 12, 12, 12, 12, 12, 12, 11, 10, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:28,994 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:28,995 INFO L427 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:28,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:28,996 INFO L82 PathProgramCache]: Analyzing trace with hash -1089242128, now seen corresponding path program 25 times [2020-07-21 16:02:28,996 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:28,996 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [461255346] [2020-07-21 16:02:28,997 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:29,429 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:02:29,430 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:29,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 508 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 16:02:29,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:29,649 INFO L134 CoverageAnalysis]: Checked inductivity of 3286 backedges. 1875 proven. 246 refuted. 0 times theorem prover too weak. 1165 trivial. 0 not checked. [2020-07-21 16:02:29,649 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:32,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:32,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:32,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:32,227 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:33,025 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:33,235 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:33,236 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:33,360 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:33,440 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:33,441 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:33,547 INFO L134 CoverageAnalysis]: Checked inductivity of 3286 backedges. 259 proven. 868 refuted. 0 times theorem prover too weak. 2159 trivial. 0 not checked. [2020-07-21 16:02:33,547 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [461255346] [2020-07-21 16:02:33,548 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:33,548 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 21] total 25 [2020-07-21 16:02:33,548 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831286129] [2020-07-21 16:02:33,548 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 16:02:33,549 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:33,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 16:02:33,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=521, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:02:33,549 INFO L87 Difference]: Start difference. First operand 223 states and 313 transitions. Second operand 25 states. [2020-07-21 16:02:34,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:34,562 INFO L93 Difference]: Finished difference Result 426 states and 611 transitions. [2020-07-21 16:02:34,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-21 16:02:34,564 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 343 [2020-07-21 16:02:34,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:34,566 INFO L225 Difference]: With dead ends: 426 [2020-07-21 16:02:34,566 INFO L226 Difference]: Without dead ends: 150 [2020-07-21 16:02:34,568 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 700 GetRequests, 643 SyntacticMatches, 19 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=263, Invalid=1297, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 16:02:34,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2020-07-21 16:02:34,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 132. [2020-07-21 16:02:34,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2020-07-21 16:02:34,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 159 transitions. [2020-07-21 16:02:34,577 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 159 transitions. Word has length 343 [2020-07-21 16:02:34,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:34,577 INFO L479 AbstractCegarLoop]: Abstraction has 132 states and 159 transitions. [2020-07-21 16:02:34,577 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 16:02:34,577 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 159 transitions. [2020-07-21 16:02:34,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2020-07-21 16:02:34,579 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:34,579 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 10, 10, 9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:34,794 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:34,795 INFO L427 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:34,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:34,796 INFO L82 PathProgramCache]: Analyzing trace with hash 120952594, now seen corresponding path program 26 times [2020-07-21 16:02:34,796 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:34,796 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [954333851] [2020-07-21 16:02:34,797 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:35,245 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:35,246 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:35,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 529 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 16:02:35,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:35,471 INFO L134 CoverageAnalysis]: Checked inductivity of 1502 backedges. 312 proven. 362 refuted. 0 times theorem prover too weak. 828 trivial. 0 not checked. [2020-07-21 16:02:35,472 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:36,747 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:36,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:36,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:36,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:36,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:36,954 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:38,050 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:38,373 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:38,562 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:38,670 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:38,807 INFO L134 CoverageAnalysis]: Checked inductivity of 1502 backedges. 310 proven. 377 refuted. 0 times theorem prover too weak. 815 trivial. 0 not checked. [2020-07-21 16:02:38,807 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [954333851] [2020-07-21 16:02:38,808 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:38,808 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 22] total 27 [2020-07-21 16:02:38,808 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956362832] [2020-07-21 16:02:38,808 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 16:02:38,809 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:38,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 16:02:38,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=610, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:02:38,809 INFO L87 Difference]: Start difference. First operand 132 states and 159 transitions. Second operand 27 states. [2020-07-21 16:02:40,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:40,030 INFO L93 Difference]: Finished difference Result 165 states and 199 transitions. [2020-07-21 16:02:40,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 16:02:40,032 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 237 [2020-07-21 16:02:40,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:40,034 INFO L225 Difference]: With dead ends: 165 [2020-07-21 16:02:40,034 INFO L226 Difference]: Without dead ends: 118 [2020-07-21 16:02:40,035 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 491 GetRequests, 430 SyntacticMatches, 19 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 349 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=323, Invalid=1569, Unknown=0, NotChecked=0, Total=1892 [2020-07-21 16:02:40,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-21 16:02:40,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 100. [2020-07-21 16:02:40,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-07-21 16:02:40,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 114 transitions. [2020-07-21 16:02:40,044 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 114 transitions. Word has length 237 [2020-07-21 16:02:40,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:40,044 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 114 transitions. [2020-07-21 16:02:40,044 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 16:02:40,044 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 114 transitions. [2020-07-21 16:02:40,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 274 [2020-07-21 16:02:40,046 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:02:40,046 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:02:40,259 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:40,260 INFO L427 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:02:40,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:02:40,260 INFO L82 PathProgramCache]: Analyzing trace with hash 220548973, now seen corresponding path program 6 times [2020-07-21 16:02:40,261 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:02:40,261 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1345198254] [2020-07-21 16:02:40,261 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:40,759 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:02:40,759 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:02:40,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 610 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 16:02:40,765 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:02:40,919 INFO L134 CoverageAnalysis]: Checked inductivity of 2050 backedges. 132 proven. 427 refuted. 0 times theorem prover too weak. 1491 trivial. 0 not checked. [2020-07-21 16:02:40,920 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:02:42,677 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:42,677 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:43,150 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:43,449 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:43,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:43,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:43,615 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:43,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:02:43,809 INFO L134 CoverageAnalysis]: Checked inductivity of 2050 backedges. 130 proven. 443 refuted. 0 times theorem prover too weak. 1477 trivial. 0 not checked. [2020-07-21 16:02:43,810 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1345198254] [2020-07-21 16:02:43,810 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:02:43,810 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16] total 19 [2020-07-21 16:02:43,810 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1281867516] [2020-07-21 16:02:43,811 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:02:43,811 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:02:43,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:02:43,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:02:43,812 INFO L87 Difference]: Start difference. First operand 100 states and 114 transitions. Second operand 19 states. [2020-07-21 16:02:44,134 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:02:44,134 INFO L93 Difference]: Finished difference Result 100 states and 114 transitions. [2020-07-21 16:02:44,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 16:02:44,136 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 273 [2020-07-21 16:02:44,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:02:44,137 INFO L225 Difference]: With dead ends: 100 [2020-07-21 16:02:44,137 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 16:02:44,139 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 551 GetRequests, 515 SyntacticMatches, 13 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2020-07-21 16:02:44,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 16:02:44,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 16:02:44,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 16:02:44,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 16:02:44,140 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 273 [2020-07-21 16:02:44,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:02:44,140 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 16:02:44,140 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:02:44,140 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 16:02:44,140 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 16:02:44,349 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:02:44,353 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 16:02:45,416 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 11 [2020-07-21 16:02:45,580 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 11 [2020-07-21 16:02:45,721 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 102 DAG size of output: 11 [2020-07-21 16:02:49,161 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 151 DAG size of output: 75 [2020-07-21 16:02:51,025 WARN L193 SmtUtils]: Spent 748.00 ms on a formula simplification. DAG size of input: 187 DAG size of output: 9 [2020-07-21 16:02:51,689 WARN L193 SmtUtils]: Spent 644.00 ms on a formula simplification. DAG size of input: 191 DAG size of output: 1 [2020-07-21 16:02:52,242 WARN L193 SmtUtils]: Spent 508.00 ms on a formula simplification. DAG size of input: 161 DAG size of output: 1 [2020-07-21 16:02:53,591 WARN L193 SmtUtils]: Spent 1.34 s on a formula simplification. DAG size of input: 236 DAG size of output: 22 [2020-07-21 16:02:54,350 WARN L193 SmtUtils]: Spent 749.00 ms on a formula simplification. DAG size of input: 192 DAG size of output: 8 [2020-07-21 16:02:56,094 WARN L193 SmtUtils]: Spent 1.73 s on a formula simplification. DAG size of input: 286 DAG size of output: 15 [2020-07-21 16:02:56,099 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 16:02:56,099 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 16:02:56,099 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 16:02:56,100 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 16:02:56,100 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 16:02:56,100 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 16:02:56,100 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 39) no Hoare annotation was computed. [2020-07-21 16:02:56,100 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 35 42) the Hoare annotation is: true [2020-07-21 16:02:56,100 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 35 42) no Hoare annotation was computed. [2020-07-21 16:02:56,100 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 35 42) no Hoare annotation was computed. [2020-07-21 16:02:56,100 INFO L268 CegarLoopResult]: For program point L39(line 39) no Hoare annotation was computed. [2020-07-21 16:02:56,100 INFO L268 CegarLoopResult]: For program point L38(lines 38 40) no Hoare annotation was computed. [2020-07-21 16:02:56,100 INFO L264 CegarLoopResult]: At program point L37(line 37) the Hoare annotation is: (and (<= main_~x~0 6) (<= 6 main_~x~0)) [2020-07-21 16:02:56,101 INFO L268 CegarLoopResult]: For program point L37-1(line 37) no Hoare annotation was computed. [2020-07-21 16:02:56,101 INFO L268 CegarLoopResult]: For program point L38-2(lines 38 40) no Hoare annotation was computed. [2020-07-21 16:02:56,101 INFO L271 CegarLoopResult]: At program point fibo2ENTRY(lines 17 25) the Hoare annotation is: true [2020-07-21 16:02:56,101 INFO L264 CegarLoopResult]: At program point L23(line 23) the Hoare annotation is: (and (<= fibo2_~n |fibo2_#in~n|) (<= |fibo2_#in~n| fibo2_~n) (not (<= |fibo2_#in~n| 2))) [2020-07-21 16:02:56,101 INFO L268 CegarLoopResult]: For program point L23-1(line 23) no Hoare annotation was computed. [2020-07-21 16:02:56,101 INFO L264 CegarLoopResult]: At program point L23-2(line 23) the Hoare annotation is: (let ((.cse0 (<= fibo2_~n |fibo2_#in~n|)) (.cse1 (<= |fibo2_#in~n| fibo2_~n))) (or (and .cse0 .cse1 (<= 6 fibo2_~n)) (and .cse0 (= 3 |fibo2_#t~ret2|) (<= 5 fibo2_~n) (< |fibo2_#in~n| 6)) (and .cse0 (< fibo2_~n 5) .cse1 (= 2 |fibo2_#t~ret2|) (<= 4 fibo2_~n)))) [2020-07-21 16:02:56,102 INFO L268 CegarLoopResult]: For program point L20(lines 20 24) no Hoare annotation was computed. [2020-07-21 16:02:56,102 INFO L268 CegarLoopResult]: For program point L23-3(line 23) no Hoare annotation was computed. [2020-07-21 16:02:56,102 INFO L268 CegarLoopResult]: For program point L18(lines 18 24) no Hoare annotation was computed. [2020-07-21 16:02:56,102 INFO L268 CegarLoopResult]: For program point fibo2FINAL(lines 17 25) no Hoare annotation was computed. [2020-07-21 16:02:56,102 INFO L268 CegarLoopResult]: For program point fibo2EXIT(lines 17 25) no Hoare annotation was computed. [2020-07-21 16:02:56,102 INFO L271 CegarLoopResult]: At program point fibo1ENTRY(lines 7 15) the Hoare annotation is: true [2020-07-21 16:02:56,103 INFO L264 CegarLoopResult]: At program point L13(line 13) the Hoare annotation is: (and (<= fibo1_~n |fibo1_#in~n|) (not (<= |fibo1_#in~n| 2)) (<= |fibo1_#in~n| fibo1_~n)) [2020-07-21 16:02:56,103 INFO L268 CegarLoopResult]: For program point L13-1(line 13) no Hoare annotation was computed. [2020-07-21 16:02:56,103 INFO L264 CegarLoopResult]: At program point L13-2(line 13) the Hoare annotation is: (let ((.cse0 (<= fibo1_~n |fibo1_#in~n|))) (or (and .cse0 (<= 5 fibo1_~n) (<= |fibo1_#in~n| 5)) (and (= 5 |fibo1_#t~ret0|) .cse0 (<= 6 fibo1_~n) (<= |fibo1_#in~n| fibo1_~n) (<= fibo1_~n 6)))) [2020-07-21 16:02:56,103 INFO L268 CegarLoopResult]: For program point fibo1FINAL(lines 7 15) no Hoare annotation was computed. [2020-07-21 16:02:56,103 INFO L268 CegarLoopResult]: For program point L10(lines 10 14) no Hoare annotation was computed. [2020-07-21 16:02:56,103 INFO L268 CegarLoopResult]: For program point L13-3(line 13) no Hoare annotation was computed. [2020-07-21 16:02:56,103 INFO L268 CegarLoopResult]: For program point L8(lines 8 14) no Hoare annotation was computed. [2020-07-21 16:02:56,103 INFO L268 CegarLoopResult]: For program point fibo1EXIT(lines 7 15) no Hoare annotation was computed. [2020-07-21 16:02:56,109 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 04:02:56 BoogieIcfgContainer [2020-07-21 16:02:56,109 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 16:02:56,111 INFO L168 Benchmark]: Toolchain (without parser) took 143634.14 ms. Allocated memory was 135.8 MB in the beginning and 958.9 MB in the end (delta: 823.1 MB). Free memory was 100.4 MB in the beginning and 270.0 MB in the end (delta: -169.6 MB). Peak memory consumption was 859.3 MB. Max. memory is 7.1 GB. [2020-07-21 16:02:56,111 INFO L168 Benchmark]: CDTParser took 0.67 ms. Allocated memory is still 135.8 MB. Free memory was 118.8 MB in the beginning and 118.6 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 16:02:56,112 INFO L168 Benchmark]: CACSL2BoogieTranslator took 248.00 ms. Allocated memory is still 135.8 MB. Free memory was 100.0 MB in the beginning and 90.7 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-21 16:02:56,112 INFO L168 Benchmark]: Boogie Preprocessor took 124.29 ms. Allocated memory was 135.8 MB in the beginning and 199.8 MB in the end (delta: 64.0 MB). Free memory was 90.4 MB in the beginning and 178.8 MB in the end (delta: -88.3 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. [2020-07-21 16:02:56,113 INFO L168 Benchmark]: RCFGBuilder took 306.20 ms. Allocated memory is still 199.8 MB. Free memory was 178.8 MB in the beginning and 164.5 MB in the end (delta: 14.2 MB). Peak memory consumption was 14.2 MB. Max. memory is 7.1 GB. [2020-07-21 16:02:56,113 INFO L168 Benchmark]: TraceAbstraction took 142945.20 ms. Allocated memory was 199.8 MB in the beginning and 958.9 MB in the end (delta: 759.2 MB). Free memory was 164.5 MB in the beginning and 270.0 MB in the end (delta: -105.4 MB). Peak memory consumption was 859.5 MB. Max. memory is 7.1 GB. [2020-07-21 16:02:56,115 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.67 ms. Allocated memory is still 135.8 MB. Free memory was 118.8 MB in the beginning and 118.6 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 248.00 ms. Allocated memory is still 135.8 MB. Free memory was 100.0 MB in the beginning and 90.7 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 124.29 ms. Allocated memory was 135.8 MB in the beginning and 199.8 MB in the end (delta: 64.0 MB). Free memory was 90.4 MB in the beginning and 178.8 MB in the end (delta: -88.3 MB). Peak memory consumption was 14.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 306.20 ms. Allocated memory is still 199.8 MB. Free memory was 178.8 MB in the beginning and 164.5 MB in the end (delta: 14.2 MB). Peak memory consumption was 14.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 142945.20 ms. Allocated memory was 199.8 MB in the beginning and 958.9 MB in the end (delta: 759.2 MB). Free memory was 164.5 MB in the beginning and 270.0 MB in the end (delta: -105.4 MB). Peak memory consumption was 859.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 39]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 131.0s, OverallIterations: 48, TraceHistogramMax: 37, AutomataDifference: 28.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 11.7s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 1568 SDtfs, 3727 SDslu, 13755 SDs, 0 SdLazy, 17650 SolverSat, 3978 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 12.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 15960 GetRequests, 14143 SyntacticMatches, 545 SemanticMatches, 1272 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7138 ImplicationChecksByTransitivity, 24.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=268occurred in iteration=34, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.8s AutomataMinimizationTime, 48 MinimizatonAttempts, 783 StatesRemovedByMinimization, 45 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 11 LocationsWithAnnotation, 3293 PreInvPairs, 5717 NumberOfFragments, 102 HoareAnnotationTreeSize, 3293 FomulaSimplifications, 73618509 FormulaSimplificationTreeSizeReduction, 5.8s HoareSimplificationTime, 11 FomulaSimplificationsInter, 98096709 FormulaSimplificationTreeSizeReductionInter, 5.7s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.4s SsaConstructionTime, 1.8s SatisfiabilityAnalysisTime, 81.8s InterpolantComputationTime, 7741 NumberOfCodeBlocks, 5757 NumberOfCodeBlocksAsserted, 75 NumberOfCheckSat, 15361 ConstructedInterpolants, 0 QuantifiedInterpolants, 5824823 SizeOfPredicates, 339 NumberOfNonLiveVariables, 14362 ConjunctsInSsa, 733 ConjunctsInUnsatCore, 94 InterpolantComputations, 2 PerfectInterpolantSequences, 78143/97934 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...