/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_4-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 15:59:55,785 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 15:59:55,787 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 15:59:55,805 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 15:59:55,805 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 15:59:55,807 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 15:59:55,808 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 15:59:55,818 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 15:59:55,822 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 15:59:55,825 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 15:59:55,826 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 15:59:55,827 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 15:59:55,828 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 15:59:55,829 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 15:59:55,831 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 15:59:55,832 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 15:59:55,834 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 15:59:55,834 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 15:59:55,836 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 15:59:55,840 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 15:59:55,845 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 15:59:55,848 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 15:59:55,849 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 15:59:55,850 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 15:59:55,852 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 15:59:55,861 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 15:59:55,862 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 15:59:55,863 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 15:59:55,864 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 15:59:55,895 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 15:59:55,895 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 15:59:55,896 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 15:59:55,896 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 15:59:55,896 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 15:59:55,897 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 15:59:55,897 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 15:59:55,897 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 15:59:55,898 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 15:59:55,898 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 15:59:55,898 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 15:59:55,898 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 15:59:55,898 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 15:59:55,899 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 15:59:55,900 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 15:59:55,900 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 15:59:55,900 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 15:59:55,900 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 15:59:55,901 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 15:59:55,901 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 15:59:55,901 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 15:59:55,901 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 15:59:55,901 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 15:59:55,901 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 15:59:55,902 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 15:59:55,902 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 15:59:55,902 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:55,902 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 15:59:55,902 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 15:59:55,903 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 15:59:56,156 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 15:59:56,172 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 15:59:56,175 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 15:59:56,178 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 15:59:56,179 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 15:59:56,180 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_4-1.c [2020-07-21 15:59:56,252 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ed84331a3/ab06e25ef50e4668a9f5c27c2c4a3f77/FLAGbd92f15b8 [2020-07-21 15:59:56,683 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 15:59:56,684 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_4-1.c [2020-07-21 15:59:56,691 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ed84331a3/ab06e25ef50e4668a9f5c27c2c4a3f77/FLAGbd92f15b8 [2020-07-21 15:59:57,087 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ed84331a3/ab06e25ef50e4668a9f5c27c2c4a3f77 [2020-07-21 15:59:57,096 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 15:59:57,098 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 15:59:57,101 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 15:59:57,101 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 15:59:57,105 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 15:59:57,106 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 03:59:57" (1/1) ... [2020-07-21 15:59:57,108 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1c64c031 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:57, skipping insertion in model container [2020-07-21 15:59:57,109 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 03:59:57" (1/1) ... [2020-07-21 15:59:57,118 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 15:59:57,138 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 15:59:57,288 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 15:59:57,292 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 15:59:57,306 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 15:59:57,318 INFO L208 MainTranslator]: Completed translation [2020-07-21 15:59:57,319 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:57 WrapperNode [2020-07-21 15:59:57,319 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 15:59:57,319 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 15:59:57,319 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 15:59:57,320 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 15:59:57,329 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:57" (1/1) ... [2020-07-21 15:59:57,329 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:57" (1/1) ... [2020-07-21 15:59:57,423 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:57" (1/1) ... [2020-07-21 15:59:57,423 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:57" (1/1) ... [2020-07-21 15:59:57,428 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:57" (1/1) ... [2020-07-21 15:59:57,430 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:57" (1/1) ... [2020-07-21 15:59:57,435 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:57" (1/1) ... [2020-07-21 15:59:57,436 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 15:59:57,437 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 15:59:57,437 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 15:59:57,437 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 15:59:57,438 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:57" (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 15:59:57,502 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 15:59:57,502 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 15:59:57,502 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-21 15:59:57,502 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-21 15:59:57,503 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 15:59:57,503 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 15:59:57,503 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 15:59:57,503 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-21 15:59:57,503 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-21 15:59:57,503 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 15:59:57,504 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 15:59:57,504 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 15:59:57,693 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 15:59:57,693 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 15:59:57,698 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 03:59:57 BoogieIcfgContainer [2020-07-21 15:59:57,698 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 15:59:57,700 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 15:59:57,700 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 15:59:57,703 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 15:59:57,704 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 03:59:57" (1/3) ... [2020-07-21 15:59:57,705 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@611615d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 03:59:57, skipping insertion in model container [2020-07-21 15:59:57,705 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:59:57" (2/3) ... [2020-07-21 15:59:57,705 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@611615d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 03:59:57, skipping insertion in model container [2020-07-21 15:59:57,705 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 03:59:57" (3/3) ... [2020-07-21 15:59:57,708 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_4-1.c [2020-07-21 15:59:57,725 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 15:59:57,733 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 15:59:57,753 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 15:59:57,796 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 15:59:57,797 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 15:59:57,797 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 15:59:57,797 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 15:59:57,797 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 15:59:57,797 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 15:59:57,797 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 15:59:57,799 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 15:59:57,818 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 15:59:57,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 15:59:57,829 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:57,830 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:57,831 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:57,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:57,835 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-21 15:59:57,842 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:57,842 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [100547209] [2020-07-21 15:59:57,842 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 15:59:57,905 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:57,905 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:57,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 15:59:57,913 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:57,999 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 15:59:57,999 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 15:59:58,001 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [100547209] [2020-07-21 15:59:58,001 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 15:59:58,002 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 15:59:58,002 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260621742] [2020-07-21 15:59:58,007 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 15:59:58,007 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:58,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 15:59:58,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 15:59:58,021 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-21 15:59:58,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:58,130 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-21 15:59:58,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 15:59:58,132 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 15:59:58,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:58,143 INFO L225 Difference]: With dead ends: 44 [2020-07-21 15:59:58,143 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 15:59:58,147 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 15:59:58,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 15:59:58,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 15:59:58,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 15:59:58,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 15:59:58,195 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-21 15:59:58,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:58,196 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 15:59:58,196 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 15:59:58,196 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 15:59:58,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 15:59:58,198 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:58,198 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:59:58,414 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:58,414 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:58,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:58,415 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-21 15:59:58,415 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:58,415 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [424386244] [2020-07-21 15:59:58,416 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 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 15:59:58,439 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:58,440 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:58,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 15:59:58,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:58,479 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 15:59:58,480 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 15:59:58,480 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [424386244] [2020-07-21 15:59:58,481 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 15:59:58,481 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 15:59:58,481 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [724826721] [2020-07-21 15:59:58,483 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 15:59:58,484 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:58,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 15:59:58,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 15:59:58,485 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-21 15:59:58,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:58,547 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-21 15:59:58,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 15:59:58,548 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 15:59:58,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:58,549 INFO L225 Difference]: With dead ends: 36 [2020-07-21 15:59:58,550 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 15:59:58,551 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 15:59:58,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 15:59:58,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 15:59:58,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 15:59:58,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 15:59:58,565 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-21 15:59:58,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:58,566 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 15:59:58,566 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 15:59:58,567 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 15:59:58,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 15:59:58,571 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:58,571 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 15:59:58,772 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:58,773 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:58,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:58,775 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-21 15:59:58,776 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:58,776 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1583491436] [2020-07-21 15:59:58,776 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 15:59:58,810 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:58,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:58,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 15:59:58,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:58,863 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 15:59:58,863 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:59,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:59,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:59,097 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 15:59:59,097 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1583491436] [2020-07-21 15:59:59,098 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:59,098 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 15:59:59,098 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019959543] [2020-07-21 15:59:59,099 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 15:59:59,099 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:59,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 15:59:59,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 15:59:59,100 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-21 15:59:59,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:59,223 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 15:59:59,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 15:59:59,223 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-21 15:59:59,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:59,225 INFO L225 Difference]: With dead ends: 41 [2020-07-21 15:59:59,226 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 15:59:59,227 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 15:59:59,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 15:59:59,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-21 15:59:59,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 15:59:59,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 15:59:59,236 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-21 15:59:59,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:59,237 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 15:59:59,237 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 15:59:59,237 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 15:59:59,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 15:59:59,239 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:59,239 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 15:59:59,453 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:59:59,454 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:59:59,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:59:59,455 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-21 15:59:59,456 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:59:59,456 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1061874909] [2020-07-21 15:59:59,457 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 15:59:59,489 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:59:59,490 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:59:59,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 15:59:59,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:59:59,544 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 15:59:59,544 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:59:59,678 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:59,679 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:59:59,720 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 15:59:59,721 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1061874909] [2020-07-21 15:59:59,721 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:59:59,721 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 15:59:59,722 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [804821486] [2020-07-21 15:59:59,722 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 15:59:59,722 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:59:59,723 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 15:59:59,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 15:59:59,723 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-21 15:59:59,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:59:59,834 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-21 15:59:59,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 15:59:59,835 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 15:59:59,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:59:59,837 INFO L225 Difference]: With dead ends: 46 [2020-07-21 15:59:59,837 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 15:59:59,838 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 15:59:59,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 15:59:59,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-21 15:59:59,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 15:59:59,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 15:59:59,847 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-21 15:59:59,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:59:59,847 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 15:59:59,847 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 15:59:59,847 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 15:59:59,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 15:59:59,849 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:59:59,849 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 16:00:00,063 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:00,064 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:00,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:00,065 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-21 16:00:00,066 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:00,067 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [604073155] [2020-07-21 16:00:00,067 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 16:00:00,101 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:00,101 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:00,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:00,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:00,156 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 16:00:00,156 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:00,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:00,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:00,469 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:00,512 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 16:00:00,512 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [604073155] [2020-07-21 16:00:00,512 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:00,513 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 16:00:00,513 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800103584] [2020-07-21 16:00:00,513 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:00:00,514 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:00,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:00:00,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:00,514 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-21 16:00:00,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:00,693 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-21 16:00:00,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:00,694 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-21 16:00:00,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:00,696 INFO L225 Difference]: With dead ends: 51 [2020-07-21 16:00:00,696 INFO L226 Difference]: Without dead ends: 47 [2020-07-21 16:00:00,697 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 16:00:00,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-21 16:00:00,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-21 16:00:00,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 16:00:00,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 16:00:00,707 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-21 16:00:00,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:00,707 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 16:00:00,708 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:00:00,708 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 16:00:00,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 16:00:00,710 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:00,710 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 16:00:00,925 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:00,926 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:00,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:00,927 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-21 16:00:00,927 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:00,928 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [60918302] [2020-07-21 16:00:00,929 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 16:00:00,959 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:00,960 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:00,960 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:00,963 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:01,018 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 16:00:01,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:01,265 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:01,266 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:01,308 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 16:00:01,309 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [60918302] [2020-07-21 16:00:01,309 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:01,309 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-21 16:00:01,311 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413260128] [2020-07-21 16:00:01,311 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:00:01,312 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:01,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:00:01,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:01,314 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-21 16:00:01,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:01,574 INFO L93 Difference]: Finished difference Result 84 states and 136 transitions. [2020-07-21 16:00:01,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:01,575 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-21 16:00:01,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:01,577 INFO L225 Difference]: With dead ends: 84 [2020-07-21 16:00:01,577 INFO L226 Difference]: Without dead ends: 50 [2020-07-21 16:00:01,579 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 16:00:01,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-21 16:00:01,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2020-07-21 16:00:01,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-21 16:00:01,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 67 transitions. [2020-07-21 16:00:01,590 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 67 transitions. Word has length 40 [2020-07-21 16:00:01,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:01,591 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 67 transitions. [2020-07-21 16:00:01,591 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:00:01,591 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 67 transitions. [2020-07-21 16:00:01,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 16:00:01,594 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:01,594 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 16:00:01,808 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:01,809 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:01,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:01,809 INFO L82 PathProgramCache]: Analyzing trace with hash 208191613, now seen corresponding path program 1 times [2020-07-21 16:00:01,810 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:01,810 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1849299206] [2020-07-21 16:00:01,810 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 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 16:00:01,854 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:01,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:01,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:01,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:01,911 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 16:00:01,911 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:02,136 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:02,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:02,219 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 16:00:02,220 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1849299206] [2020-07-21 16:00:02,220 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:02,220 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-21 16:00:02,220 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [133561738] [2020-07-21 16:00:02,221 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 16:00:02,221 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:02,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 16:00:02,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-21 16:00:02,222 INFO L87 Difference]: Start difference. First operand 47 states and 67 transitions. Second operand 11 states. [2020-07-21 16:00:02,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:02,388 INFO L93 Difference]: Finished difference Result 63 states and 99 transitions. [2020-07-21 16:00:02,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:02,389 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 16:00:02,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:02,394 INFO L225 Difference]: With dead ends: 63 [2020-07-21 16:00:02,394 INFO L226 Difference]: Without dead ends: 59 [2020-07-21 16:00:02,395 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 68 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:00:02,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-21 16:00:02,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2020-07-21 16:00:02,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 16:00:02,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 77 transitions. [2020-07-21 16:00:02,417 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 77 transitions. Word has length 41 [2020-07-21 16:00:02,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:02,418 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 77 transitions. [2020-07-21 16:00:02,418 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 16:00:02,418 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 77 transitions. [2020-07-21 16:00:02,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-21 16:00:02,424 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:02,424 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 16:00:02,624 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:02,625 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:02,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:02,626 INFO L82 PathProgramCache]: Analyzing trace with hash -1291563674, now seen corresponding path program 1 times [2020-07-21 16:00:02,626 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:02,627 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1488729600] [2020-07-21 16:00:02,628 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 16:00:02,665 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:02,666 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:02,667 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:00:02,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:02,726 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 16:00:02,726 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:02,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:02,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:02,952 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 16:00:02,953 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1488729600] [2020-07-21 16:00:02,953 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:02,957 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-21 16:00:02,958 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792792863] [2020-07-21 16:00:02,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 16:00:02,960 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:02,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 16:00:02,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-07-21 16:00:02,960 INFO L87 Difference]: Start difference. First operand 51 states and 77 transitions. Second operand 9 states. [2020-07-21 16:00:03,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:03,068 INFO L93 Difference]: Finished difference Result 65 states and 105 transitions. [2020-07-21 16:00:03,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 16:00:03,069 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 53 [2020-07-21 16:00:03,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:03,071 INFO L225 Difference]: With dead ends: 65 [2020-07-21 16:00:03,071 INFO L226 Difference]: Without dead ends: 61 [2020-07-21 16:00:03,071 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 95 SyntacticMatches, 5 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2020-07-21 16:00:03,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-07-21 16:00:03,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 53. [2020-07-21 16:00:03,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-07-21 16:00:03,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 82 transitions. [2020-07-21 16:00:03,083 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 82 transitions. Word has length 53 [2020-07-21 16:00:03,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:03,084 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 82 transitions. [2020-07-21 16:00:03,084 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 16:00:03,084 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 82 transitions. [2020-07-21 16:00:03,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-21 16:00:03,086 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:03,086 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 16:00:03,297 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:03,298 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:03,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:03,299 INFO L82 PathProgramCache]: Analyzing trace with hash 736840020, now seen corresponding path program 2 times [2020-07-21 16:00:03,300 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:03,301 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [332090341] [2020-07-21 16:00:03,301 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:00:03,349 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:03,349 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:03,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 16:00:03,353 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:03,423 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 16:00:03,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:03,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:03,810 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:03,941 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:03,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:03,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:03,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:04,042 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 16:00:04,043 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [332090341] [2020-07-21 16:00:04,043 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:04,043 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 16:00:04,043 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128061578] [2020-07-21 16:00:04,044 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 16:00:04,044 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:04,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 16:00:04,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 16:00:04,045 INFO L87 Difference]: Start difference. First operand 53 states and 82 transitions. Second operand 13 states. [2020-07-21 16:00:04,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:04,238 INFO L93 Difference]: Finished difference Result 75 states and 134 transitions. [2020-07-21 16:00:04,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:00:04,239 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 78 [2020-07-21 16:00:04,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:04,242 INFO L225 Difference]: With dead ends: 75 [2020-07-21 16:00:04,242 INFO L226 Difference]: Without dead ends: 71 [2020-07-21 16:00:04,243 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 137 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 16:00:04,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-07-21 16:00:04,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 56. [2020-07-21 16:00:04,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 16:00:04,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 90 transitions. [2020-07-21 16:00:04,254 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 90 transitions. Word has length 78 [2020-07-21 16:00:04,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:04,255 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 90 transitions. [2020-07-21 16:00:04,255 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 16:00:04,255 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 90 transitions. [2020-07-21 16:00:04,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 16:00:04,257 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:04,257 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 16:00:04,470 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:04,470 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:04,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:04,471 INFO L82 PathProgramCache]: Analyzing trace with hash 977113353, now seen corresponding path program 1 times [2020-07-21 16:00:04,471 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:04,472 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1067479492] [2020-07-21 16:00:04,472 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 16:00:04,514 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:04,514 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:04,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 16:00:04,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:04,584 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 16:00:04,584 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:04,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:04,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:04,962 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 16:00:04,962 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1067479492] [2020-07-21 16:00:04,962 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:04,963 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-07-21 16:00:04,963 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084288607] [2020-07-21 16:00:04,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 16:00:04,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:04,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 16:00:04,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-07-21 16:00:04,964 INFO L87 Difference]: Start difference. First operand 56 states and 90 transitions. Second operand 12 states. [2020-07-21 16:00:05,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:05,173 INFO L93 Difference]: Finished difference Result 114 states and 219 transitions. [2020-07-21 16:00:05,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:05,174 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 67 [2020-07-21 16:00:05,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:05,176 INFO L225 Difference]: With dead ends: 114 [2020-07-21 16:00:05,176 INFO L226 Difference]: Without dead ends: 64 [2020-07-21 16:00:05,178 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 16:00:05,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-07-21 16:00:05,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 61. [2020-07-21 16:00:05,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 16:00:05,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 101 transitions. [2020-07-21 16:00:05,188 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 101 transitions. Word has length 67 [2020-07-21 16:00:05,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:05,189 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 101 transitions. [2020-07-21 16:00:05,189 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 16:00:05,189 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 101 transitions. [2020-07-21 16:00:05,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 16:00:05,191 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:05,191 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 16:00:05,405 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:05,406 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:05,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:05,407 INFO L82 PathProgramCache]: Analyzing trace with hash 643857677, now seen corresponding path program 2 times [2020-07-21 16:00:05,408 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:05,408 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [28106087] [2020-07-21 16:00:05,409 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 16:00:05,449 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:05,450 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:05,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:05,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:05,541 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 23 proven. 31 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-21 16:00:05,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:05,820 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:06,064 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:06,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:06,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:06,169 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 23 proven. 33 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2020-07-21 16:00:06,170 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [28106087] [2020-07-21 16:00:06,170 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:06,170 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-21 16:00:06,171 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [295937700] [2020-07-21 16:00:06,171 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:00:06,171 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:06,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:00:06,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:00:06,172 INFO L87 Difference]: Start difference. First operand 61 states and 101 transitions. Second operand 17 states. [2020-07-21 16:00:06,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:06,568 INFO L93 Difference]: Finished difference Result 131 states and 252 transitions. [2020-07-21 16:00:06,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:00:06,568 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 67 [2020-07-21 16:00:06,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:06,570 INFO L225 Difference]: With dead ends: 131 [2020-07-21 16:00:06,572 INFO L226 Difference]: Without dead ends: 76 [2020-07-21 16:00:06,573 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 113 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 16:00:06,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-21 16:00:06,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 68. [2020-07-21 16:00:06,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-07-21 16:00:06,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 106 transitions. [2020-07-21 16:00:06,597 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 106 transitions. Word has length 67 [2020-07-21 16:00:06,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:06,597 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 106 transitions. [2020-07-21 16:00:06,597 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:00:06,597 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 106 transitions. [2020-07-21 16:00:06,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-07-21 16:00:06,601 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:06,601 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 16:00:06,816 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:06,817 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:06,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:06,818 INFO L82 PathProgramCache]: Analyzing trace with hash -1156896337, now seen corresponding path program 3 times [2020-07-21 16:00:06,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:06,819 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [330304974] [2020-07-21 16:00:06,819 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 16:00:06,868 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:06,869 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:06,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 39 conjunts are in the unsatisfiable core [2020-07-21 16:00:06,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:07,038 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2020-07-21 16:00:07,038 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:07,479 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2020-07-21 16:00:07,479 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [330304974] [2020-07-21 16:00:07,480 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:07,480 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 21 [2020-07-21 16:00:07,480 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1763312981] [2020-07-21 16:00:07,481 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:00:07,481 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:07,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:00:07,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=373, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:07,481 INFO L87 Difference]: Start difference. First operand 68 states and 106 transitions. Second operand 21 states. [2020-07-21 16:00:07,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:07,687 INFO L93 Difference]: Finished difference Result 118 states and 250 transitions. [2020-07-21 16:00:07,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 16:00:07,688 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 68 [2020-07-21 16:00:07,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:07,691 INFO L225 Difference]: With dead ends: 118 [2020-07-21 16:00:07,692 INFO L226 Difference]: Without dead ends: 114 [2020-07-21 16:00:07,692 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=411, Unknown=0, NotChecked=0, Total=462 [2020-07-21 16:00:07,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-07-21 16:00:07,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 89. [2020-07-21 16:00:07,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-07-21 16:00:07,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 172 transitions. [2020-07-21 16:00:07,711 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 172 transitions. Word has length 68 [2020-07-21 16:00:07,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:07,711 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 172 transitions. [2020-07-21 16:00:07,712 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:00:07,712 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 172 transitions. [2020-07-21 16:00:07,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-07-21 16:00:07,714 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:07,714 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 16:00:07,927 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:07,928 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:07,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:07,929 INFO L82 PathProgramCache]: Analyzing trace with hash -1969207761, now seen corresponding path program 4 times [2020-07-21 16:00:07,930 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:07,930 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1386693077] [2020-07-21 16:00:07,931 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 16:00:07,988 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:07,988 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:07,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:07,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:08,079 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 42 proven. 70 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2020-07-21 16:00:08,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:08,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:08,406 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:08,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:08,668 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:08,725 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:08,726 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:08,777 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 42 proven. 72 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2020-07-21 16:00:08,778 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1386693077] [2020-07-21 16:00:08,778 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:08,778 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-21 16:00:08,778 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912540795] [2020-07-21 16:00:08,779 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:00:08,779 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:08,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:00:08,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:00:08,780 INFO L87 Difference]: Start difference. First operand 89 states and 172 transitions. Second operand 17 states. [2020-07-21 16:00:09,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:09,224 INFO L93 Difference]: Finished difference Result 209 states and 466 transitions. [2020-07-21 16:00:09,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 16:00:09,225 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 94 [2020-07-21 16:00:09,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:09,228 INFO L225 Difference]: With dead ends: 209 [2020-07-21 16:00:09,228 INFO L226 Difference]: Without dead ends: 126 [2020-07-21 16:00:09,231 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 165 SyntacticMatches, 11 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=137, Invalid=565, Unknown=0, NotChecked=0, Total=702 [2020-07-21 16:00:09,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-07-21 16:00:09,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 123. [2020-07-21 16:00:09,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2020-07-21 16:00:09,258 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 206 transitions. [2020-07-21 16:00:09,259 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 206 transitions. Word has length 94 [2020-07-21 16:00:09,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:09,259 INFO L479 AbstractCegarLoop]: Abstraction has 123 states and 206 transitions. [2020-07-21 16:00:09,259 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:00:09,259 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 206 transitions. [2020-07-21 16:00:09,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-07-21 16:00:09,261 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:09,262 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 2, 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] [2020-07-21 16:00:09,476 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:09,477 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:09,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:09,477 INFO L82 PathProgramCache]: Analyzing trace with hash -1711191765, now seen corresponding path program 2 times [2020-07-21 16:00:09,478 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:09,478 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1488320324] [2020-07-21 16:00:09,478 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 16:00:09,538 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:09,539 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:09,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:00:09,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:09,573 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 40 proven. 4 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 16:00:09,573 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:09,830 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 16 proven. 23 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-07-21 16:00:09,831 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1488320324] [2020-07-21 16:00:09,831 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:09,831 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-21 16:00:09,831 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948776487] [2020-07-21 16:00:09,832 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 16:00:09,832 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:09,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 16:00:09,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-07-21 16:00:09,832 INFO L87 Difference]: Start difference. First operand 123 states and 206 transitions. Second operand 9 states. [2020-07-21 16:00:09,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:09,951 INFO L93 Difference]: Finished difference Result 236 states and 408 transitions. [2020-07-21 16:00:09,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:09,952 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 69 [2020-07-21 16:00:09,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:09,970 INFO L225 Difference]: With dead ends: 236 [2020-07-21 16:00:09,971 INFO L226 Difference]: Without dead ends: 118 [2020-07-21 16:00:09,972 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 127 SyntacticMatches, 5 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=52, Invalid=104, Unknown=0, NotChecked=0, Total=156 [2020-07-21 16:00:09,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-21 16:00:09,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2020-07-21 16:00:09,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2020-07-21 16:00:09,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 181 transitions. [2020-07-21 16:00:09,983 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 181 transitions. Word has length 69 [2020-07-21 16:00:09,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:09,983 INFO L479 AbstractCegarLoop]: Abstraction has 118 states and 181 transitions. [2020-07-21 16:00:09,983 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 16:00:09,984 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 181 transitions. [2020-07-21 16:00:09,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-07-21 16:00:09,985 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:09,986 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:10,198 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:10,199 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:10,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:10,200 INFO L82 PathProgramCache]: Analyzing trace with hash 1082273126, now seen corresponding path program 5 times [2020-07-21 16:00:10,200 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:10,200 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [114100967] [2020-07-21 16:00:10,201 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 16:00:10,288 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:10,288 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:10,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 16:00:10,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:10,425 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 29 proven. 54 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2020-07-21 16:00:10,425 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:10,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:10,898 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:11,165 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:11,216 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:11,252 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 29 proven. 56 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-21 16:00:11,252 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [114100967] [2020-07-21 16:00:11,252 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:11,252 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 19 [2020-07-21 16:00:11,253 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021423012] [2020-07-21 16:00:11,253 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:00:11,253 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:11,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:00:11,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:00:11,254 INFO L87 Difference]: Start difference. First operand 118 states and 181 transitions. Second operand 19 states. [2020-07-21 16:00:11,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:11,873 INFO L93 Difference]: Finished difference Result 220 states and 354 transitions. [2020-07-21 16:00:11,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 16:00:11,874 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 80 [2020-07-21 16:00:11,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:11,876 INFO L225 Difference]: With dead ends: 220 [2020-07-21 16:00:11,876 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 16:00:11,878 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 139 SyntacticMatches, 11 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=178, Invalid=752, Unknown=0, NotChecked=0, Total=930 [2020-07-21 16:00:11,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 16:00:11,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2020-07-21 16:00:11,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-07-21 16:00:11,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 124 transitions. [2020-07-21 16:00:11,886 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 124 transitions. Word has length 80 [2020-07-21 16:00:11,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:11,886 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 124 transitions. [2020-07-21 16:00:11,887 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:00:11,887 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 124 transitions. [2020-07-21 16:00:11,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-07-21 16:00:11,888 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:11,888 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 16:00:12,099 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:12,100 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:12,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:12,101 INFO L82 PathProgramCache]: Analyzing trace with hash -658368179, now seen corresponding path program 2 times [2020-07-21 16:00:12,101 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:12,102 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [999297051] [2020-07-21 16:00:12,102 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 16:00:12,168 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:12,168 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:12,169 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 16:00:12,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:12,246 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 117 proven. 11 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2020-07-21 16:00:12,247 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:12,691 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:12,758 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 39 proven. 54 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-07-21 16:00:12,759 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [999297051] [2020-07-21 16:00:12,759 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:12,759 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 14 [2020-07-21 16:00:12,759 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626601952] [2020-07-21 16:00:12,760 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 16:00:12,760 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:12,760 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 16:00:12,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-07-21 16:00:12,761 INFO L87 Difference]: Start difference. First operand 90 states and 124 transitions. Second operand 14 states. [2020-07-21 16:00:12,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:12,975 INFO L93 Difference]: Finished difference Result 174 states and 246 transitions. [2020-07-21 16:00:12,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 16:00:12,976 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 92 [2020-07-21 16:00:12,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:12,978 INFO L225 Difference]: With dead ends: 174 [2020-07-21 16:00:12,978 INFO L226 Difference]: Without dead ends: 90 [2020-07-21 16:00:12,979 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 165 SyntacticMatches, 7 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=74, Invalid=268, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:00:12,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-07-21 16:00:12,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2020-07-21 16:00:12,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-07-21 16:00:12,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 123 transitions. [2020-07-21 16:00:12,986 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 123 transitions. Word has length 92 [2020-07-21 16:00:12,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:12,987 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 123 transitions. [2020-07-21 16:00:12,987 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 16:00:12,987 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 123 transitions. [2020-07-21 16:00:12,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2020-07-21 16:00:12,988 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:12,989 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 8, 8, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:13,203 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:13,204 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:13,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:13,205 INFO L82 PathProgramCache]: Analyzing trace with hash -1986613294, now seen corresponding path program 3 times [2020-07-21 16:00:13,205 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:13,206 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [223717175] [2020-07-21 16:00:13,206 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 16:00:13,276 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:13,277 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:13,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 16:00:13,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:13,370 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 222 proven. 90 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2020-07-21 16:00:13,371 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:14,140 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:14,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:14,191 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:14,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:14,451 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:14,512 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:14,564 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 72 proven. 167 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2020-07-21 16:00:14,566 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [223717175] [2020-07-21 16:00:14,566 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:14,567 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 15] total 21 [2020-07-21 16:00:14,567 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111667130] [2020-07-21 16:00:14,567 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:00:14,568 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:14,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:00:14,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:14,568 INFO L87 Difference]: Start difference. First operand 90 states and 123 transitions. Second operand 21 states. [2020-07-21 16:00:15,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:15,072 INFO L93 Difference]: Finished difference Result 209 states and 319 transitions. [2020-07-21 16:00:15,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 16:00:15,073 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 132 [2020-07-21 16:00:15,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:15,075 INFO L225 Difference]: With dead ends: 209 [2020-07-21 16:00:15,075 INFO L226 Difference]: Without dead ends: 125 [2020-07-21 16:00:15,077 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 234 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 16:00:15,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2020-07-21 16:00:15,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 106. [2020-07-21 16:00:15,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-07-21 16:00:15,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 151 transitions. [2020-07-21 16:00:15,085 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 151 transitions. Word has length 132 [2020-07-21 16:00:15,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:15,086 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 151 transitions. [2020-07-21 16:00:15,086 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:00:15,086 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 151 transitions. [2020-07-21 16:00:15,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-07-21 16:00:15,087 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:15,088 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:15,300 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:15,301 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:15,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:15,301 INFO L82 PathProgramCache]: Analyzing trace with hash 1187422937, now seen corresponding path program 4 times [2020-07-21 16:00:15,301 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:15,302 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1700547385] [2020-07-21 16:00:15,302 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 16:00:15,376 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:15,377 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:15,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 16:00:15,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:15,410 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 62 proven. 4 refuted. 0 times theorem prover too weak. 115 trivial. 0 not checked. [2020-07-21 16:00:15,411 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:15,696 INFO L134 CoverageAnalysis]: Checked inductivity of 181 backedges. 62 proven. 4 refuted. 0 times theorem prover too weak. 115 trivial. 0 not checked. [2020-07-21 16:00:15,697 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1700547385] [2020-07-21 16:00:15,697 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:15,697 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-21 16:00:15,697 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081411981] [2020-07-21 16:00:15,698 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 16:00:15,698 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:15,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 16:00:15,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-07-21 16:00:15,699 INFO L87 Difference]: Start difference. First operand 106 states and 151 transitions. Second operand 9 states. [2020-07-21 16:00:15,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:15,830 INFO L93 Difference]: Finished difference Result 211 states and 312 transitions. [2020-07-21 16:00:15,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 16:00:15,830 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 93 [2020-07-21 16:00:15,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:15,832 INFO L225 Difference]: With dead ends: 211 [2020-07-21 16:00:15,832 INFO L226 Difference]: Without dead ends: 110 [2020-07-21 16:00:15,833 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 174 SyntacticMatches, 5 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=104, Unknown=0, NotChecked=0, Total=156 [2020-07-21 16:00:15,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-21 16:00:15,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 106. [2020-07-21 16:00:15,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-07-21 16:00:15,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 150 transitions. [2020-07-21 16:00:15,843 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 150 transitions. Word has length 93 [2020-07-21 16:00:15,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:15,845 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 150 transitions. [2020-07-21 16:00:15,845 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 16:00:15,845 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 150 transitions. [2020-07-21 16:00:15,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-07-21 16:00:15,847 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:15,847 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:16,061 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:16,062 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:16,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:16,062 INFO L82 PathProgramCache]: Analyzing trace with hash 1257865878, now seen corresponding path program 6 times [2020-07-21 16:00:16,062 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:16,062 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1237821286] [2020-07-21 16:00:16,063 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 16:00:16,129 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:16,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:16,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 16:00:16,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:16,240 INFO L134 CoverageAnalysis]: Checked inductivity of 248 backedges. 65 proven. 94 refuted. 0 times theorem prover too weak. 89 trivial. 0 not checked. [2020-07-21 16:00:16,240 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:16,752 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:16,807 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:16,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:17,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:17,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:17,271 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:17,333 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:17,374 INFO L134 CoverageAnalysis]: Checked inductivity of 248 backedges. 65 proven. 100 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-07-21 16:00:17,375 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1237821286] [2020-07-21 16:00:17,375 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:17,375 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 21 [2020-07-21 16:00:17,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319434520] [2020-07-21 16:00:17,376 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 16:00:17,376 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:17,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 16:00:17,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=361, Unknown=0, NotChecked=0, Total=420 [2020-07-21 16:00:17,377 INFO L87 Difference]: Start difference. First operand 106 states and 150 transitions. Second operand 21 states. [2020-07-21 16:00:17,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:17,978 INFO L93 Difference]: Finished difference Result 238 states and 370 transitions. [2020-07-21 16:00:17,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 16:00:17,978 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 106 [2020-07-21 16:00:17,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:17,980 INFO L225 Difference]: With dead ends: 238 [2020-07-21 16:00:17,980 INFO L226 Difference]: Without dead ends: 136 [2020-07-21 16:00:17,982 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 181 SyntacticMatches, 15 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=219, Invalid=971, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 16:00:17,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2020-07-21 16:00:17,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 121. [2020-07-21 16:00:17,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-07-21 16:00:17,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 173 transitions. [2020-07-21 16:00:17,990 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 173 transitions. Word has length 106 [2020-07-21 16:00:17,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:17,990 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 173 transitions. [2020-07-21 16:00:17,990 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 16:00:17,990 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 173 transitions. [2020-07-21 16:00:17,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-07-21 16:00:17,992 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:17,992 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:18,206 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:18,207 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:18,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:18,208 INFO L82 PathProgramCache]: Analyzing trace with hash -1607585794, now seen corresponding path program 7 times [2020-07-21 16:00:18,208 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:18,208 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1563079137] [2020-07-21 16:00:18,209 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 16:00:18,284 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 16:00:18,284 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:18,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:18,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:18,371 INFO L134 CoverageAnalysis]: Checked inductivity of 248 backedges. 158 proven. 31 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2020-07-21 16:00:18,371 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:18,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:19,128 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:19,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:19,197 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:19,252 INFO L134 CoverageAnalysis]: Checked inductivity of 248 backedges. 50 proven. 96 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2020-07-21 16:00:19,253 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1563079137] [2020-07-21 16:00:19,253 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:19,253 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 17 [2020-07-21 16:00:19,253 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [774673114] [2020-07-21 16:00:19,254 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 16:00:19,254 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:19,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 16:00:19,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-07-21 16:00:19,255 INFO L87 Difference]: Start difference. First operand 121 states and 173 transitions. Second operand 17 states. [2020-07-21 16:00:19,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:19,637 INFO L93 Difference]: Finished difference Result 240 states and 349 transitions. [2020-07-21 16:00:19,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 16:00:19,637 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 106 [2020-07-21 16:00:19,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:19,639 INFO L225 Difference]: With dead ends: 240 [2020-07-21 16:00:19,639 INFO L226 Difference]: Without dead ends: 125 [2020-07-21 16:00:19,641 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 186 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 16:00:19,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2020-07-21 16:00:19,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 123. [2020-07-21 16:00:19,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2020-07-21 16:00:19,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 171 transitions. [2020-07-21 16:00:19,653 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 171 transitions. Word has length 106 [2020-07-21 16:00:19,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:19,654 INFO L479 AbstractCegarLoop]: Abstraction has 123 states and 171 transitions. [2020-07-21 16:00:19,654 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 16:00:19,654 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 171 transitions. [2020-07-21 16:00:19,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 16:00:19,656 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:19,656 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:19,871 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:19,872 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:19,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:19,872 INFO L82 PathProgramCache]: Analyzing trace with hash -1540036056, now seen corresponding path program 8 times [2020-07-21 16:00:19,872 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:19,873 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [50725557] [2020-07-21 16:00:19,873 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 16:00:19,962 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:19,963 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:19,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 16:00:19,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:20,043 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 34 proven. 93 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-07-21 16:00:20,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:20,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:20,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:20,771 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:20,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:20,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:20,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:20,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:20,941 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 34 proven. 103 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-07-21 16:00:20,941 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [50725557] [2020-07-21 16:00:20,941 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:20,941 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 16:00:20,942 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192205808] [2020-07-21 16:00:20,942 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 16:00:20,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:20,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 16:00:20,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:00:20,943 INFO L87 Difference]: Start difference. First operand 123 states and 171 transitions. Second operand 15 states. [2020-07-21 16:00:21,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:21,174 INFO L93 Difference]: Finished difference Result 130 states and 179 transitions. [2020-07-21 16:00:21,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:00:21,175 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 109 [2020-07-21 16:00:21,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:21,177 INFO L225 Difference]: With dead ends: 130 [2020-07-21 16:00:21,177 INFO L226 Difference]: Without dead ends: 74 [2020-07-21 16:00:21,178 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 193 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 16:00:21,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-07-21 16:00:21,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 71. [2020-07-21 16:00:21,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 16:00:21,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 83 transitions. [2020-07-21 16:00:21,183 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 83 transitions. Word has length 109 [2020-07-21 16:00:21,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:21,184 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 83 transitions. [2020-07-21 16:00:21,184 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 16:00:21,184 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 83 transitions. [2020-07-21 16:00:21,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-07-21 16:00:21,185 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:21,185 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 16:00:21,398 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:21,399 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:21,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:21,400 INFO L82 PathProgramCache]: Analyzing trace with hash -923530611, now seen corresponding path program 5 times [2020-07-21 16:00:21,400 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:21,401 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1630023272] [2020-07-21 16:00:21,401 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 16:00:21,488 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:21,489 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:21,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 206 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 16:00:21,491 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:21,588 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 56 proven. 51 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2020-07-21 16:00:21,588 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:21,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:22,232 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:22,299 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:22,367 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 55 proven. 53 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2020-07-21 16:00:22,367 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1630023272] [2020-07-21 16:00:22,368 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:22,368 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 19 [2020-07-21 16:00:22,368 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [853814797] [2020-07-21 16:00:22,368 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 16:00:22,369 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:22,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 16:00:22,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=287, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:00:22,369 INFO L87 Difference]: Start difference. First operand 71 states and 83 transitions. Second operand 19 states. [2020-07-21 16:00:22,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:22,755 INFO L93 Difference]: Finished difference Result 81 states and 92 transitions. [2020-07-21 16:00:22,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 16:00:22,758 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 92 [2020-07-21 16:00:22,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:22,759 INFO L225 Difference]: With dead ends: 81 [2020-07-21 16:00:22,759 INFO L226 Difference]: Without dead ends: 69 [2020-07-21 16:00:22,760 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 159 SyntacticMatches, 11 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=154, Invalid=658, Unknown=0, NotChecked=0, Total=812 [2020-07-21 16:00:22,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-07-21 16:00:22,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2020-07-21 16:00:22,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-07-21 16:00:22,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 79 transitions. [2020-07-21 16:00:22,764 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 79 transitions. Word has length 92 [2020-07-21 16:00:22,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:22,765 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 79 transitions. [2020-07-21 16:00:22,765 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 16:00:22,765 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 79 transitions. [2020-07-21 16:00:22,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-07-21 16:00:22,766 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 16:00:22,766 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 16:00:22,971 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:22,971 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 16:00:22,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 16:00:22,972 INFO L82 PathProgramCache]: Analyzing trace with hash 767209796, now seen corresponding path program 3 times [2020-07-21 16:00:22,972 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 16:00:22,973 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1752235641] [2020-07-21 16:00:22,973 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 16:00:23,071 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 16:00:23,071 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 16:00:23,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 16:00:23,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 16:00:23,148 INFO L134 CoverageAnalysis]: Checked inductivity of 241 backedges. 35 proven. 73 refuted. 0 times theorem prover too weak. 133 trivial. 0 not checked. [2020-07-21 16:00:23,148 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 16:00:23,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:23,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:23,715 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:23,791 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 16:00:23,849 INFO L134 CoverageAnalysis]: Checked inductivity of 241 backedges. 34 proven. 78 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2020-07-21 16:00:23,849 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1752235641] [2020-07-21 16:00:23,849 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 16:00:23,850 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12] total 15 [2020-07-21 16:00:23,850 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483220193] [2020-07-21 16:00:23,851 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 16:00:23,851 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 16:00:23,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 16:00:23,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2020-07-21 16:00:23,851 INFO L87 Difference]: Start difference. First operand 69 states and 79 transitions. Second operand 15 states. [2020-07-21 16:00:24,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 16:00:24,013 INFO L93 Difference]: Finished difference Result 69 states and 79 transitions. [2020-07-21 16:00:24,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 16:00:24,014 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 104 [2020-07-21 16:00:24,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 16:00:24,014 INFO L225 Difference]: With dead ends: 69 [2020-07-21 16:00:24,015 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 16:00:24,015 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 185 SyntacticMatches, 9 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=78, Invalid=264, Unknown=0, NotChecked=0, Total=342 [2020-07-21 16:00:24,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 16:00:24,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 16:00:24,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 16:00:24,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 16:00:24,016 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 104 [2020-07-21 16:00:24,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 16:00:24,016 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 16:00:24,016 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 16:00:24,017 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 16:00:24,017 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 16:00:24,217 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 16:00:24,221 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 16:00:25,411 WARN L193 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 23 [2020-07-21 16:00:25,516 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 8 [2020-07-21 16:00:25,866 WARN L193 SmtUtils]: Spent 343.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 21 [2020-07-21 16:00:25,870 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 16:00:25,870 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 16:00:25,871 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 16:00:25,871 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 16:00:25,871 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 16:00:25,871 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 16:00:25,871 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 39) no Hoare annotation was computed. [2020-07-21 16:00:25,871 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 35 42) the Hoare annotation is: true [2020-07-21 16:00:25,871 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 35 42) no Hoare annotation was computed. [2020-07-21 16:00:25,872 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 35 42) no Hoare annotation was computed. [2020-07-21 16:00:25,872 INFO L268 CegarLoopResult]: For program point L39(line 39) no Hoare annotation was computed. [2020-07-21 16:00:25,872 INFO L268 CegarLoopResult]: For program point L38(lines 38 40) no Hoare annotation was computed. [2020-07-21 16:00:25,872 INFO L264 CegarLoopResult]: At program point L37(line 37) the Hoare annotation is: (and (<= 4 main_~x~0) (<= main_~x~0 4)) [2020-07-21 16:00:25,872 INFO L268 CegarLoopResult]: For program point L37-1(line 37) no Hoare annotation was computed. [2020-07-21 16:00:25,872 INFO L268 CegarLoopResult]: For program point L38-2(lines 38 40) no Hoare annotation was computed. [2020-07-21 16:00:25,872 INFO L271 CegarLoopResult]: At program point fibo2ENTRY(lines 17 25) the Hoare annotation is: true [2020-07-21 16:00:25,873 INFO L264 CegarLoopResult]: At program point L23(line 23) the Hoare annotation is: (and (<= fibo2_~n |fibo2_#in~n|) (<= |fibo2_#in~n| fibo2_~n) (<= 2 |fibo2_#in~n|)) [2020-07-21 16:00:25,873 INFO L268 CegarLoopResult]: For program point L23-1(line 23) no Hoare annotation was computed. [2020-07-21 16:00:25,873 INFO L264 CegarLoopResult]: At program point L23-2(line 23) the Hoare annotation is: (let ((.cse0 (<= |fibo2_#in~n| fibo2_~n))) (and (not (<= |fibo2_#in~n| 1)) (or (and .cse0 (<= 4 fibo2_~n)) (and (= 1 |fibo2_#t~ret2|) (<= |fibo2_#in~n| 3))) (or (and (<= fibo2_~n 2) .cse0) (and (<= fibo2_~n |fibo2_#in~n|) (<= 3 fibo2_~n))))) [2020-07-21 16:00:25,873 INFO L268 CegarLoopResult]: For program point L20(lines 20 24) no Hoare annotation was computed. [2020-07-21 16:00:25,874 INFO L268 CegarLoopResult]: For program point L23-3(line 23) no Hoare annotation was computed. [2020-07-21 16:00:25,874 INFO L268 CegarLoopResult]: For program point L18(lines 18 24) no Hoare annotation was computed. [2020-07-21 16:00:25,874 INFO L268 CegarLoopResult]: For program point fibo2FINAL(lines 17 25) no Hoare annotation was computed. [2020-07-21 16:00:25,874 INFO L268 CegarLoopResult]: For program point fibo2EXIT(lines 17 25) no Hoare annotation was computed. [2020-07-21 16:00:25,874 INFO L271 CegarLoopResult]: At program point fibo1ENTRY(lines 7 15) the Hoare annotation is: true [2020-07-21 16:00:25,874 INFO L264 CegarLoopResult]: At program point L13(line 13) the Hoare annotation is: (and (<= fibo1_~n |fibo1_#in~n|) (not (<= |fibo1_#in~n| 1)) (<= |fibo1_#in~n| fibo1_~n)) [2020-07-21 16:00:25,874 INFO L268 CegarLoopResult]: For program point L13-1(line 13) no Hoare annotation was computed. [2020-07-21 16:00:25,874 INFO L264 CegarLoopResult]: At program point L13-2(line 13) the Hoare annotation is: (and (<= fibo1_~n |fibo1_#in~n|) (or (<= 5 |fibo1_#in~n|) (= 2 |fibo1_#t~ret0|) (<= |fibo1_#in~n| 3)) (not (<= |fibo1_#in~n| 1)) (<= |fibo1_#in~n| fibo1_~n) (or (not (<= |fibo1_#in~n| 2)) (= 1 |fibo1_#t~ret0|))) [2020-07-21 16:00:25,874 INFO L268 CegarLoopResult]: For program point fibo1FINAL(lines 7 15) no Hoare annotation was computed. [2020-07-21 16:00:25,874 INFO L268 CegarLoopResult]: For program point L10(lines 10 14) no Hoare annotation was computed. [2020-07-21 16:00:25,875 INFO L268 CegarLoopResult]: For program point L13-3(line 13) no Hoare annotation was computed. [2020-07-21 16:00:25,875 INFO L268 CegarLoopResult]: For program point L8(lines 8 14) no Hoare annotation was computed. [2020-07-21 16:00:25,875 INFO L268 CegarLoopResult]: For program point fibo1EXIT(lines 7 15) no Hoare annotation was computed. [2020-07-21 16:00:25,880 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 04:00:25 BoogieIcfgContainer [2020-07-21 16:00:25,880 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 16:00:25,881 INFO L168 Benchmark]: Toolchain (without parser) took 28784.17 ms. Allocated memory was 145.8 MB in the beginning and 419.4 MB in the end (delta: 273.7 MB). Free memory was 103.8 MB in the beginning and 378.7 MB in the end (delta: -274.9 MB). Peak memory consumption was 274.7 MB. Max. memory is 7.1 GB. [2020-07-21 16:00:25,882 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 145.8 MB. Free memory is still 121.6 MB. There was no memory consumed. Max. memory is 7.1 GB. [2020-07-21 16:00:25,882 INFO L168 Benchmark]: CACSL2BoogieTranslator took 218.22 ms. Allocated memory is still 145.8 MB. Free memory was 103.4 MB in the beginning and 93.8 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-07-21 16:00:25,883 INFO L168 Benchmark]: Boogie Preprocessor took 117.21 ms. Allocated memory was 145.8 MB in the beginning and 203.4 MB in the end (delta: 57.7 MB). Free memory was 93.8 MB in the beginning and 181.9 MB in the end (delta: -88.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-07-21 16:00:25,884 INFO L168 Benchmark]: RCFGBuilder took 261.37 ms. Allocated memory is still 203.4 MB. Free memory was 181.9 MB in the beginning and 168.7 MB in the end (delta: 13.3 MB). Peak memory consumption was 13.3 MB. Max. memory is 7.1 GB. [2020-07-21 16:00:25,884 INFO L168 Benchmark]: TraceAbstraction took 28180.20 ms. Allocated memory was 203.4 MB in the beginning and 419.4 MB in the end (delta: 216.0 MB). Free memory was 168.7 MB in the beginning and 378.7 MB in the end (delta: -210.1 MB). Peak memory consumption was 281.9 MB. Max. memory is 7.1 GB. [2020-07-21 16:00:25,887 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 145.8 MB. Free memory is still 121.6 MB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 218.22 ms. Allocated memory is still 145.8 MB. Free memory was 103.4 MB in the beginning and 93.8 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 117.21 ms. Allocated memory was 145.8 MB in the beginning and 203.4 MB in the end (delta: 57.7 MB). Free memory was 93.8 MB in the beginning and 181.9 MB in the end (delta: -88.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * RCFGBuilder took 261.37 ms. Allocated memory is still 203.4 MB. Free memory was 181.9 MB in the beginning and 168.7 MB in the end (delta: 13.3 MB). Peak memory consumption was 13.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 28180.20 ms. Allocated memory was 203.4 MB in the beginning and 419.4 MB in the end (delta: 216.0 MB). Free memory was 168.7 MB in the beginning and 378.7 MB in the end (delta: -210.1 MB). Peak memory consumption was 281.9 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: 26.4s, OverallIterations: 23, TraceHistogramMax: 11, AutomataDifference: 6.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 1.6s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 678 SDtfs, 1012 SDslu, 4226 SDs, 0 SdLazy, 4039 SolverSat, 820 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 3344 GetRequests, 2783 SyntacticMatches, 167 SemanticMatches, 394 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 963 ImplicationChecksByTransitivity, 5.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=123occurred in iteration=13, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 23 MinimizatonAttempts, 137 StatesRemovedByMinimization, 18 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 11 LocationsWithAnnotation, 578 PreInvPairs, 930 NumberOfFragments, 98 HoareAnnotationTreeSize, 578 FomulaSimplifications, 11076 FormulaSimplificationTreeSizeReduction, 0.7s HoareSimplificationTime, 11 FomulaSimplificationsInter, 3295 FormulaSimplificationTreeSizeReductionInter, 0.8s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 13.6s InterpolantComputationTime, 1610 NumberOfCodeBlocks, 1318 NumberOfCodeBlocksAsserted, 39 NumberOfCheckSat, 3149 ConstructedInterpolants, 0 QuantifiedInterpolants, 520423 SizeOfPredicates, 112 NumberOfNonLiveVariables, 3181 ConjunctsInSsa, 243 ConjunctsInUnsatCore, 44 InterpolantComputations, 2 PerfectInterpolantSequences, 3890/5612 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...