/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id2_i5_o5-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 13:24:22,392 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-21 13:24:22,414 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 13:24:22,417 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 13:24:22,419 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 13:24:22,432 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 13:24:22,434 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 13:24:22,435 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 13:24:22,436 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 13:24:22,437 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 13:24:22,437 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 13:24:22,438 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 13:24:22,439 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 13:24:22,441 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 13:24:22,441 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 13:24:22,442 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 13:24:22,444 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 13:24:22,446 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 13:24:22,447 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 13:24:22,448 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 13:24:22,449 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 13:24:22,450 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 13:24:22,453 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 13:24:22,460 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 13:24:22,461 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 13:24:22,461 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 13:24:22,462 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 13:24:22,477 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 13:24:22,478 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 13:24:22,479 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 13:24:22,479 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 13:24:22,479 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 13:24:22,480 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 13:24:22,480 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 13:24:22,480 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 13:24:22,480 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 13:24:22,480 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 13:24:22,481 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 13:24:22,481 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 13:24:22,481 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 13:24:22,481 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 13:24:22,481 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 13:24:22,482 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 13:24:22,482 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 13:24:22,482 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 13:24:22,482 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 13:24:22,482 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 13:24:22,483 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 13:24:22,483 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 13:24:22,483 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 13:24:22,483 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 13:24:22,483 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 13:24:22,484 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 13:24:22,484 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:22,484 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 13:24:22,484 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 13:24:22,484 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 13:24:22,796 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 13:24:22,810 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 13:24:22,814 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 13:24:22,815 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 13:24:22,816 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 13:24:22,817 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_i5_o5-2.c [2020-07-21 13:24:22,894 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/919b8ae27/4b9c2e4a3bd347febf4d144e91cd9cf7/FLAG8adb3af5c [2020-07-21 13:24:23,470 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 13:24:23,470 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id2_i5_o5-2.c [2020-07-21 13:24:23,478 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/919b8ae27/4b9c2e4a3bd347febf4d144e91cd9cf7/FLAG8adb3af5c [2020-07-21 13:24:23,815 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/919b8ae27/4b9c2e4a3bd347febf4d144e91cd9cf7 [2020-07-21 13:24:23,828 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 13:24:23,831 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 13:24:23,833 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 13:24:23,833 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 13:24:23,838 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 13:24:23,840 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:24:23" (1/1) ... [2020-07-21 13:24:23,843 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@461a50ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:24:23, skipping insertion in model container [2020-07-21 13:24:23,844 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:24:23" (1/1) ... [2020-07-21 13:24:23,854 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 13:24:23,880 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 13:24:24,099 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:24:24,104 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 13:24:24,120 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:24:24,133 INFO L208 MainTranslator]: Completed translation [2020-07-21 13:24:24,133 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:24:24 WrapperNode [2020-07-21 13:24:24,133 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 13:24:24,134 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 13:24:24,134 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 13:24:24,134 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 13:24:24,148 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:24:24" (1/1) ... [2020-07-21 13:24:24,148 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:24:24" (1/1) ... [2020-07-21 13:24:24,155 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:24:24" (1/1) ... [2020-07-21 13:24:24,155 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:24:24" (1/1) ... [2020-07-21 13:24:24,159 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:24:24" (1/1) ... [2020-07-21 13:24:24,162 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:24:24" (1/1) ... [2020-07-21 13:24:24,163 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:24:24" (1/1) ... [2020-07-21 13:24:24,165 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 13:24:24,165 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 13:24:24,165 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 13:24:24,165 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 13:24:24,167 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:24:24" (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 13:24:24,332 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 13:24:24,332 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 13:24:24,332 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-21 13:24:24,332 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-07-21 13:24:24,333 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 13:24:24,333 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 13:24:24,333 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 13:24:24,333 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-21 13:24:24,334 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-07-21 13:24:24,334 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 13:24:24,334 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 13:24:24,335 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 13:24:24,531 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 13:24:24,532 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 13:24:24,537 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:24:24 BoogieIcfgContainer [2020-07-21 13:24:24,537 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 13:24:24,539 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 13:24:24,539 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 13:24:24,543 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 13:24:24,543 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:24:23" (1/3) ... [2020-07-21 13:24:24,544 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5968dbc2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:24:24, skipping insertion in model container [2020-07-21 13:24:24,544 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:24:24" (2/3) ... [2020-07-21 13:24:24,545 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5968dbc2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:24:24, skipping insertion in model container [2020-07-21 13:24:24,545 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:24:24" (3/3) ... [2020-07-21 13:24:24,547 INFO L109 eAbstractionObserver]: Analyzing ICFG id2_i5_o5-2.c [2020-07-21 13:24:24,559 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 13:24:24,568 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 13:24:24,583 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 13:24:24,610 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 13:24:24,610 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 13:24:24,610 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 13:24:24,610 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 13:24:24,611 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 13:24:24,611 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 13:24:24,611 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 13:24:24,611 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 13:24:24,628 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2020-07-21 13:24:24,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 13:24:24,636 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:24,637 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:24,638 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:24,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:24,644 INFO L82 PathProgramCache]: Analyzing trace with hash -550894517, now seen corresponding path program 1 times [2020-07-21 13:24:24,651 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:24,651 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1853371453] [2020-07-21 13:24:24,652 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 13:24:24,719 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:24,719 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:24,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 13:24:24,729 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:24,855 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 13:24:24,856 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:24:24,857 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1853371453] [2020-07-21 13:24:24,864 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:24:24,865 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 13:24:24,870 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1683373450] [2020-07-21 13:24:24,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 13:24:24,876 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:24,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 13:24:24,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:24:24,891 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 5 states. [2020-07-21 13:24:24,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:24,985 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2020-07-21 13:24:24,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 13:24:24,988 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 13:24:24,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:25,000 INFO L225 Difference]: With dead ends: 36 [2020-07-21 13:24:25,000 INFO L226 Difference]: Without dead ends: 24 [2020-07-21 13:24:25,004 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 13:24:25,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-21 13:24:25,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-21 13:24:25,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-21 13:24:25,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-07-21 13:24:25,057 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 13 [2020-07-21 13:24:25,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:25,059 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-07-21 13:24:25,059 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 13:24:25,060 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-07-21 13:24:25,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 13:24:25,063 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:25,063 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:25,279 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:25,280 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:25,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:25,281 INFO L82 PathProgramCache]: Analyzing trace with hash 40504409, now seen corresponding path program 1 times [2020-07-21 13:24:25,282 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:25,282 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1003475717] [2020-07-21 13:24:25,282 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 13:24:25,317 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:25,317 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:25,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 45 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 13:24:25,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:25,385 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 13:24:25,386 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:24:25,386 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1003475717] [2020-07-21 13:24:25,387 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:24:25,387 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-21 13:24:25,387 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084910647] [2020-07-21 13:24:25,389 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-21 13:24:25,390 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:25,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-21 13:24:25,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-07-21 13:24:25,391 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 7 states. [2020-07-21 13:24:25,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:25,484 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2020-07-21 13:24:25,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 13:24:25,486 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2020-07-21 13:24:25,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:25,487 INFO L225 Difference]: With dead ends: 33 [2020-07-21 13:24:25,487 INFO L226 Difference]: Without dead ends: 29 [2020-07-21 13:24:25,489 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-07-21 13:24:25,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-21 13:24:25,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2020-07-21 13:24:25,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-21 13:24:25,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2020-07-21 13:24:25,498 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 19 [2020-07-21 13:24:25,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:25,498 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2020-07-21 13:24:25,498 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-21 13:24:25,499 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2020-07-21 13:24:25,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 13:24:25,500 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:25,500 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] [2020-07-21 13:24:25,713 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:25,714 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:25,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:25,716 INFO L82 PathProgramCache]: Analyzing trace with hash 1029702107, now seen corresponding path program 1 times [2020-07-21 13:24:25,716 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:25,717 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1175043615] [2020-07-21 13:24:25,718 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 13:24:25,751 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:25,752 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:25,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:24:25,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:25,848 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 13:24:25,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:26,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:26,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:26,286 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:26,288 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:26,343 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 13:24:26,344 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1175043615] [2020-07-21 13:24:26,344 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:26,345 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 13:24:26,345 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198879769] [2020-07-21 13:24:26,346 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 13:24:26,346 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:26,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 13:24:26,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 13:24:26,347 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 12 states. [2020-07-21 13:24:26,479 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:26,479 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2020-07-21 13:24:26,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 13:24:26,480 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 25 [2020-07-21 13:24:26,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:26,482 INFO L225 Difference]: With dead ends: 39 [2020-07-21 13:24:26,482 INFO L226 Difference]: Without dead ends: 35 [2020-07-21 13:24:26,484 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 33 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:24:26,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-21 13:24:26,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 30. [2020-07-21 13:24:26,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 13:24:26,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-07-21 13:24:26,499 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 25 [2020-07-21 13:24:26,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:26,500 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-07-21 13:24:26,500 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 13:24:26,500 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-07-21 13:24:26,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 13:24:26,503 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:26,504 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:26,717 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:26,718 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:26,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:26,719 INFO L82 PathProgramCache]: Analyzing trace with hash -559715991, now seen corresponding path program 1 times [2020-07-21 13:24:26,720 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:26,720 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [939929362] [2020-07-21 13:24:26,720 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 13:24:26,792 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:26,793 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:26,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:24:26,798 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:26,885 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 13:24:26,885 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:27,299 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:27,301 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:27,411 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:27,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:27,469 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:27,471 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:27,524 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-21 13:24:27,524 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [939929362] [2020-07-21 13:24:27,524 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:27,525 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 13:24:27,525 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1134621595] [2020-07-21 13:24:27,526 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 13:24:27,526 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:27,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 13:24:27,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 13:24:27,527 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 14 states. [2020-07-21 13:24:27,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:27,655 INFO L93 Difference]: Finished difference Result 45 states and 47 transitions. [2020-07-21 13:24:27,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:24:27,655 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 31 [2020-07-21 13:24:27,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:27,657 INFO L225 Difference]: With dead ends: 45 [2020-07-21 13:24:27,657 INFO L226 Difference]: Without dead ends: 41 [2020-07-21 13:24:27,658 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 41 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 13:24:27,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-07-21 13:24:27,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 33. [2020-07-21 13:24:27,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 13:24:27,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2020-07-21 13:24:27,666 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 31 [2020-07-21 13:24:27,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:27,667 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2020-07-21 13:24:27,667 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 13:24:27,667 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2020-07-21 13:24:27,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-21 13:24:27,668 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:27,669 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:27,870 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:27,871 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:27,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:27,872 INFO L82 PathProgramCache]: Analyzing trace with hash 2003326827, now seen corresponding path program 2 times [2020-07-21 13:24:27,873 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:27,876 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [607350092] [2020-07-21 13:24:27,877 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 13:24:27,922 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:27,923 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:27,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:24:27,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:28,005 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-07-21 13:24:28,005 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:28,602 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:28,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:28,838 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:28,883 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:24:28,919 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 13:24:28,920 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [607350092] [2020-07-21 13:24:28,920 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:28,921 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 13:24:28,921 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707154460] [2020-07-21 13:24:28,922 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:24:28,922 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:28,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:24:28,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:24:28,923 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 15 states. [2020-07-21 13:24:29,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:29,073 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-07-21 13:24:29,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:24:29,076 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-07-21 13:24:29,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:29,078 INFO L225 Difference]: With dead ends: 51 [2020-07-21 13:24:29,078 INFO L226 Difference]: Without dead ends: 47 [2020-07-21 13:24:29,079 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 49 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 13:24:29,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-21 13:24:29,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 36. [2020-07-21 13:24:29,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 13:24:29,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-07-21 13:24:29,087 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 37 [2020-07-21 13:24:29,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:29,087 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-07-21 13:24:29,087 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:24:29,087 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-07-21 13:24:29,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-21 13:24:29,089 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:29,089 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:29,295 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:29,296 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:29,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:29,297 INFO L82 PathProgramCache]: Analyzing trace with hash 1197899385, now seen corresponding path program 2 times [2020-07-21 13:24:29,298 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:29,298 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1490363794] [2020-07-21 13:24:29,299 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:24:29,343 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:29,344 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:29,345 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 13:24:29,347 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:29,501 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 13:24:29,502 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:24:29,870 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 13:24:29,870 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1490363794] [2020-07-21 13:24:29,871 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:24:29,871 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 15 [2020-07-21 13:24:29,871 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917618058] [2020-07-21 13:24:29,872 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:24:29,872 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:29,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:24:29,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:24:29,873 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 15 states. [2020-07-21 13:24:29,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:29,993 INFO L93 Difference]: Finished difference Result 57 states and 59 transitions. [2020-07-21 13:24:29,994 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 13:24:29,994 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 43 [2020-07-21 13:24:29,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:29,998 INFO L225 Difference]: With dead ends: 57 [2020-07-21 13:24:29,998 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 13:24:29,999 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 70 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:24:30,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 13:24:30,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 39. [2020-07-21 13:24:30,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-21 13:24:30,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 41 transitions. [2020-07-21 13:24:30,019 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 41 transitions. Word has length 43 [2020-07-21 13:24:30,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:30,020 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 41 transitions. [2020-07-21 13:24:30,020 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:24:30,020 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 41 transitions. [2020-07-21 13:24:30,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-21 13:24:30,023 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:30,023 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:30,239 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:30,241 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:30,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:30,241 INFO L82 PathProgramCache]: Analyzing trace with hash 706413819, now seen corresponding path program 3 times [2020-07-21 13:24:30,242 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:30,242 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1321441522] [2020-07-21 13:24:30,243 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 13:24:30,293 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:30,293 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:30,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 13:24:30,297 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:30,396 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2020-07-21 13:24:30,396 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:24:30,396 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1321441522] [2020-07-21 13:24:30,397 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:24:30,397 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2020-07-21 13:24:30,397 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561258674] [2020-07-21 13:24:30,398 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 13:24:30,398 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:30,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 13:24:30,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 13:24:30,399 INFO L87 Difference]: Start difference. First operand 39 states and 41 transitions. Second operand 12 states. [2020-07-21 13:24:30,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:30,565 INFO L93 Difference]: Finished difference Result 63 states and 65 transitions. [2020-07-21 13:24:30,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 13:24:30,568 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 49 [2020-07-21 13:24:30,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:30,569 INFO L225 Difference]: With dead ends: 63 [2020-07-21 13:24:30,570 INFO L226 Difference]: Without dead ends: 39 [2020-07-21 13:24:30,571 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=76, Invalid=266, Unknown=0, NotChecked=0, Total=342 [2020-07-21 13:24:30,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-21 13:24:30,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-07-21 13:24:30,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-21 13:24:30,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-07-21 13:24:30,586 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 49 [2020-07-21 13:24:30,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:30,586 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-07-21 13:24:30,586 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 13:24:30,587 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-07-21 13:24:30,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-21 13:24:30,589 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:24:30,590 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:24:30,803 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:30,804 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:24:30,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:24:30,805 INFO L82 PathProgramCache]: Analyzing trace with hash -1492956279, now seen corresponding path program 3 times [2020-07-21 13:24:30,806 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:24:30,806 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [817335774] [2020-07-21 13:24:30,807 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 13:24:30,860 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:24:30,860 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:24:30,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 13:24:30,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:24:30,971 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 33 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2020-07-21 13:24:30,972 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:24:30,972 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [817335774] [2020-07-21 13:24:30,972 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:24:30,973 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2020-07-21 13:24:30,973 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929372265] [2020-07-21 13:24:30,973 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 13:24:30,974 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:24:30,974 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 13:24:30,974 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 13:24:30,975 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 13 states. [2020-07-21 13:24:31,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:24:31,130 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2020-07-21 13:24:31,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 13:24:31,131 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 55 [2020-07-21 13:24:31,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:24:31,132 INFO L225 Difference]: With dead ends: 39 [2020-07-21 13:24:31,132 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 13:24:31,134 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=91, Invalid=329, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:24:31,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 13:24:31,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 13:24:31,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 13:24:31,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 13:24:31,135 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 55 [2020-07-21 13:24:31,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:24:31,135 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 13:24:31,135 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 13:24:31,135 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 13:24:31,136 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 13:24:31,337 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:24:31,340 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 13:24:31,436 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 13:24:31,436 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 13:24:31,436 INFO L264 CegarLoopResult]: At program point L14(line 14) the Hoare annotation is: (and (<= |id2_#in~x| id2_~x) (<= id2_~x |id2_#in~x|)) [2020-07-21 13:24:31,436 INFO L268 CegarLoopResult]: For program point L13(line 13) no Hoare annotation was computed. [2020-07-21 13:24:31,437 INFO L268 CegarLoopResult]: For program point L14-1(line 14) no Hoare annotation was computed. [2020-07-21 13:24:31,437 INFO L268 CegarLoopResult]: For program point id2EXIT(lines 12 15) no Hoare annotation was computed. [2020-07-21 13:24:31,438 INFO L271 CegarLoopResult]: At program point id2ENTRY(lines 12 15) the Hoare annotation is: true [2020-07-21 13:24:31,438 INFO L268 CegarLoopResult]: For program point id2FINAL(lines 12 15) no Hoare annotation was computed. [2020-07-21 13:24:31,438 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 13:24:31,438 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 13:24:31,441 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 13:24:31,441 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 13:24:31,442 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 21) no Hoare annotation was computed. [2020-07-21 13:24:31,442 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 17 23) the Hoare annotation is: true [2020-07-21 13:24:31,442 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 17 23) no Hoare annotation was computed. [2020-07-21 13:24:31,442 INFO L268 CegarLoopResult]: For program point L21(line 21) no Hoare annotation was computed. [2020-07-21 13:24:31,442 INFO L268 CegarLoopResult]: For program point L20(lines 20 22) no Hoare annotation was computed. [2020-07-21 13:24:31,442 INFO L264 CegarLoopResult]: At program point L19(line 19) the Hoare annotation is: (and (<= main_~input~0 5) (<= 5 main_~input~0)) [2020-07-21 13:24:31,442 INFO L268 CegarLoopResult]: For program point L19-1(line 19) no Hoare annotation was computed. [2020-07-21 13:24:31,443 INFO L268 CegarLoopResult]: For program point L20-2(lines 17 23) no Hoare annotation was computed. [2020-07-21 13:24:31,443 INFO L268 CegarLoopResult]: For program point idFINAL(lines 7 10) no Hoare annotation was computed. [2020-07-21 13:24:31,443 INFO L268 CegarLoopResult]: For program point idEXIT(lines 7 10) no Hoare annotation was computed. [2020-07-21 13:24:31,443 INFO L264 CegarLoopResult]: At program point L9(line 9) the Hoare annotation is: (and (<= |id_#in~x| id_~x) (<= id_~x |id_#in~x|)) [2020-07-21 13:24:31,443 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-07-21 13:24:31,443 INFO L268 CegarLoopResult]: For program point L9-1(line 9) no Hoare annotation was computed. [2020-07-21 13:24:31,443 INFO L271 CegarLoopResult]: At program point idENTRY(lines 7 10) the Hoare annotation is: true [2020-07-21 13:24:31,456 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 01:24:31 BoogieIcfgContainer [2020-07-21 13:24:31,456 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 13:24:31,461 INFO L168 Benchmark]: Toolchain (without parser) took 7629.23 ms. Allocated memory was 143.1 MB in the beginning and 287.8 MB in the end (delta: 144.7 MB). Free memory was 101.5 MB in the beginning and 128.0 MB in the end (delta: -26.5 MB). Peak memory consumption was 118.2 MB. Max. memory is 7.1 GB. [2020-07-21 13:24:31,468 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 143.1 MB. Free memory was 119.3 MB in the beginning and 119.1 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 13:24:31,470 INFO L168 Benchmark]: CACSL2BoogieTranslator took 301.25 ms. Allocated memory is still 143.1 MB. Free memory was 101.1 MB in the beginning and 91.8 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-07-21 13:24:31,471 INFO L168 Benchmark]: Boogie Preprocessor took 30.59 ms. Allocated memory is still 143.1 MB. Free memory was 91.8 MB in the beginning and 90.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-21 13:24:31,471 INFO L168 Benchmark]: RCFGBuilder took 372.39 ms. Allocated memory was 143.1 MB in the beginning and 200.8 MB in the end (delta: 57.7 MB). Free memory was 90.2 MB in the beginning and 167.2 MB in the end (delta: -77.0 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. [2020-07-21 13:24:31,474 INFO L168 Benchmark]: TraceAbstraction took 6917.70 ms. Allocated memory was 200.8 MB in the beginning and 287.8 MB in the end (delta: 87.0 MB). Free memory was 167.2 MB in the beginning and 128.0 MB in the end (delta: 39.3 MB). Peak memory consumption was 126.3 MB. Max. memory is 7.1 GB. [2020-07-21 13:24:31,488 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 143.1 MB. Free memory was 119.3 MB in the beginning and 119.1 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 301.25 ms. Allocated memory is still 143.1 MB. Free memory was 101.1 MB in the beginning and 91.8 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 30.59 ms. Allocated memory is still 143.1 MB. Free memory was 91.8 MB in the beginning and 90.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 372.39 ms. Allocated memory was 143.1 MB in the beginning and 200.8 MB in the end (delta: 57.7 MB). Free memory was 90.2 MB in the beginning and 167.2 MB in the end (delta: -77.0 MB). Peak memory consumption was 9.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 6917.70 ms. Allocated memory was 200.8 MB in the beginning and 287.8 MB in the end (delta: 87.0 MB). Free memory was 167.2 MB in the beginning and 128.0 MB in the end (delta: 39.3 MB). Peak memory consumption was 126.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 21]: 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, 26 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 6.7s, OverallIterations: 8, TraceHistogramMax: 4, AutomataDifference: 1.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 179 SDtfs, 130 SDslu, 1108 SDs, 0 SdLazy, 510 SolverSat, 28 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 430 GetRequests, 296 SyntacticMatches, 27 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 1.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=39occurred in iteration=6, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 8 MinimizatonAttempts, 40 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 11 PreInvPairs, 11 NumberOfFragments, 27 HoareAnnotationTreeSize, 11 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 9 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 3.2s InterpolantComputationTime, 272 NumberOfCodeBlocks, 272 NumberOfCodeBlocksAsserted, 16 NumberOfCheckSat, 396 ConstructedInterpolants, 0 QuantifiedInterpolants, 35544 SizeOfPredicates, 37 NumberOfNonLiveVariables, 640 ConjunctsInSsa, 101 ConjunctsInUnsatCore, 12 InterpolantComputations, 4 PerfectInterpolantSequences, 170/246 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...