/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/sum01_bug02.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 22:16:28,784 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 22:16:28,787 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 22:16:28,804 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 22:16:28,805 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 22:16:28,807 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 22:16:28,809 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 22:16:28,811 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 22:16:28,813 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 22:16:28,817 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 22:16:28,818 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 22:16:28,822 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 22:16:28,822 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 22:16:28,825 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 22:16:28,826 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 22:16:28,828 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 22:16:28,829 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 22:16:28,833 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 22:16:28,834 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 22:16:28,836 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 22:16:28,837 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 22:16:28,838 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 22:16:28,839 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 22:16:28,840 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 22:16:28,842 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 22:16:28,849 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 22:16:28,850 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 22:16:28,850 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 22:16:28,851 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 22:16:28,865 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 22:16:28,866 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 22:16:28,867 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 22:16:28,867 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 22:16:28,867 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 22:16:28,867 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 22:16:28,868 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 22:16:28,868 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 22:16:28,868 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 22:16:28,868 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 22:16:28,868 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 22:16:28,868 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 22:16:28,869 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 22:16:28,869 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 22:16:28,869 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 22:16:28,869 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 22:16:28,869 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 22:16:28,870 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 22:16:28,870 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 22:16:28,870 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 22:16:28,870 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 22:16:28,870 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 22:16:28,871 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 22:16:28,871 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 22:16:28,871 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 22:16:28,871 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 22:16:28,871 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:16:28,871 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 22:16:28,872 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 22:16:28,872 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 22:16:29,197 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 22:16:29,215 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 22:16:29,219 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 22:16:29,222 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 22:16:29,223 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 22:16:29,224 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum01_bug02.i [2020-07-20 22:16:29,295 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/44dd03aa3/ce75cdfa2f80424a9a2a5501f9cdbe59/FLAG0bcb77437 [2020-07-20 22:16:29,732 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 22:16:29,732 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01_bug02.i [2020-07-20 22:16:29,737 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/44dd03aa3/ce75cdfa2f80424a9a2a5501f9cdbe59/FLAG0bcb77437 [2020-07-20 22:16:30,169 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/44dd03aa3/ce75cdfa2f80424a9a2a5501f9cdbe59 [2020-07-20 22:16:30,178 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 22:16:30,181 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 22:16:30,182 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 22:16:30,182 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 22:16:30,185 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 22:16:30,186 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:16:30" (1/1) ... [2020-07-20 22:16:30,189 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@c2043f9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:16:30, skipping insertion in model container [2020-07-20 22:16:30,189 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:16:30" (1/1) ... [2020-07-20 22:16:30,196 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 22:16:30,210 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 22:16:30,426 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 22:16:30,431 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 22:16:30,451 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 22:16:30,464 INFO L208 MainTranslator]: Completed translation [2020-07-20 22:16:30,465 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:16:30 WrapperNode [2020-07-20 22:16:30,465 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 22:16:30,465 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 22:16:30,466 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 22:16:30,466 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 22:16:30,475 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:16:30" (1/1) ... [2020-07-20 22:16:30,475 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:16:30" (1/1) ... [2020-07-20 22:16:30,479 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:16:30" (1/1) ... [2020-07-20 22:16:30,480 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:16:30" (1/1) ... [2020-07-20 22:16:30,482 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:16:30" (1/1) ... [2020-07-20 22:16:30,486 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:16:30" (1/1) ... [2020-07-20 22:16:30,487 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:16:30" (1/1) ... [2020-07-20 22:16:30,569 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 22:16:30,570 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 22:16:30,570 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 22:16:30,570 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 22:16:30,571 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:16:30" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 22:16:30,628 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 22:16:30,628 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 22:16:30,628 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 22:16:30,628 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 22:16:30,628 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 22:16:30,628 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 22:16:30,629 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-20 22:16:30,629 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 22:16:30,629 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 22:16:30,629 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 22:16:30,804 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 22:16:30,805 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 22:16:30,808 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:16:30 BoogieIcfgContainer [2020-07-20 22:16:30,808 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 22:16:30,810 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 22:16:30,810 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 22:16:30,813 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 22:16:30,813 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 10:16:30" (1/3) ... [2020-07-20 22:16:30,814 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6ba9b119 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:16:30, skipping insertion in model container [2020-07-20 22:16:30,814 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:16:30" (2/3) ... [2020-07-20 22:16:30,815 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6ba9b119 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:16:30, skipping insertion in model container [2020-07-20 22:16:30,815 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:16:30" (3/3) ... [2020-07-20 22:16:30,819 INFO L109 eAbstractionObserver]: Analyzing ICFG sum01_bug02.i [2020-07-20 22:16:30,844 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 22:16:30,855 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 22:16:30,888 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 22:16:30,927 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 22:16:30,928 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 22:16:30,928 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 22:16:30,928 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 22:16:30,928 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 22:16:30,929 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 22:16:30,929 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 22:16:30,929 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 22:16:30,950 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-20 22:16:30,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-20 22:16:30,956 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:16:30,957 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:16:30,958 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:16:30,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:16:30,965 INFO L82 PathProgramCache]: Analyzing trace with hash -146959038, now seen corresponding path program 1 times [2020-07-20 22:16:30,978 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:16:30,979 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [437932562] [2020-07-20 22:16:30,986 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:16:31,037 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:16:31,038 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:16:31,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 22:16:31,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:16:31,114 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:16:31,114 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:16:31,115 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [437932562] [2020-07-20 22:16:31,116 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:16:31,116 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 22:16:31,117 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2026367288] [2020-07-20 22:16:31,121 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 22:16:31,122 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:16:31,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 22:16:31,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 22:16:31,134 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-20 22:16:31,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:16:31,213 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-07-20 22:16:31,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 22:16:31,215 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-07-20 22:16:31,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:16:31,223 INFO L225 Difference]: With dead ends: 42 [2020-07-20 22:16:31,223 INFO L226 Difference]: Without dead ends: 18 [2020-07-20 22:16:31,227 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 22:16:31,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-20 22:16:31,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-20 22:16:31,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 22:16:31,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-07-20 22:16:31,260 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 10 [2020-07-20 22:16:31,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:16:31,261 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-07-20 22:16:31,261 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 22:16:31,261 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-07-20 22:16:31,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 22:16:31,262 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:16:31,262 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:16:31,468 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:16:31,469 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:16:31,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:16:31,470 INFO L82 PathProgramCache]: Analyzing trace with hash 1017948080, now seen corresponding path program 1 times [2020-07-20 22:16:31,471 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:16:31,472 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1190428283] [2020-07-20 22:16:31,472 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:16:31,502 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:16:31,503 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:16:31,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 22:16:31,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:16:31,619 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 22:16:31,656 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:16:31,656 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:16:31,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:16:31,823 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:16:31,824 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1190428283] [2020-07-20 22:16:31,824 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:16:31,824 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2020-07-20 22:16:31,825 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [341593978] [2020-07-20 22:16:31,827 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 22:16:31,827 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:16:31,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 22:16:31,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2020-07-20 22:16:31,829 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 14 states. [2020-07-20 22:16:32,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:16:32,110 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2020-07-20 22:16:32,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 22:16:32,111 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 14 [2020-07-20 22:16:32,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:16:32,112 INFO L225 Difference]: With dead ends: 39 [2020-07-20 22:16:32,112 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 22:16:32,114 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=236, Unknown=0, NotChecked=0, Total=306 [2020-07-20 22:16:32,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 22:16:32,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 27. [2020-07-20 22:16:32,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-20 22:16:32,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2020-07-20 22:16:32,121 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 14 [2020-07-20 22:16:32,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:16:32,122 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2020-07-20 22:16:32,122 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 22:16:32,122 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2020-07-20 22:16:32,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 22:16:32,123 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:16:32,123 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:16:32,336 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:16:32,338 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:16:32,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:16:32,339 INFO L82 PathProgramCache]: Analyzing trace with hash -852639511, now seen corresponding path program 1 times [2020-07-20 22:16:32,340 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:16:32,340 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1054804115] [2020-07-20 22:16:32,340 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) [2020-07-20 22:16:32,368 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:16:32,368 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:16:32,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 3 conjunts are in the unsatisfiable core Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:16:32,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:16:32,381 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 22:16:32,381 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:16:32,381 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1054804115] [2020-07-20 22:16:32,382 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:16:32,382 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 22:16:32,382 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294957447] [2020-07-20 22:16:32,383 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 22:16:32,383 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:16:32,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 22:16:32,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 22:16:32,384 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 3 states. [2020-07-20 22:16:32,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:16:32,403 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2020-07-20 22:16:32,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 22:16:32,406 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-20 22:16:32,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:16:32,407 INFO L225 Difference]: With dead ends: 36 [2020-07-20 22:16:32,407 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 22:16:32,407 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 22:16:32,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 22:16:32,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-07-20 22:16:32,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-20 22:16:32,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2020-07-20 22:16:32,413 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 18 [2020-07-20 22:16:32,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:16:32,413 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2020-07-20 22:16:32,413 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 22:16:32,414 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2020-07-20 22:16:32,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 22:16:32,414 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:16:32,415 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:16:32,628 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:16:32,629 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:16:32,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:16:32,630 INFO L82 PathProgramCache]: Analyzing trace with hash -1920151575, now seen corresponding path program 2 times [2020-07-20 22:16:32,631 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:16:32,631 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1431581620] [2020-07-20 22:16:32,632 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:16:32,660 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:16:32,660 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:16:32,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 22:16:32,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:16:32,695 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:16:32,696 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:16:32,728 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:16:32,728 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1431581620] [2020-07-20 22:16:32,728 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:16:32,729 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2020-07-20 22:16:32,729 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1085435303] [2020-07-20 22:16:32,729 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 22:16:32,730 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:16:32,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 22:16:32,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-07-20 22:16:32,730 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 8 states. [2020-07-20 22:16:32,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:16:32,772 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2020-07-20 22:16:32,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 22:16:32,773 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2020-07-20 22:16:32,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:16:32,774 INFO L225 Difference]: With dead ends: 36 [2020-07-20 22:16:32,774 INFO L226 Difference]: Without dead ends: 27 [2020-07-20 22:16:32,775 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-07-20 22:16:32,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-20 22:16:32,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2020-07-20 22:16:32,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-20 22:16:32,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-20 22:16:32,781 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 18 [2020-07-20 22:16:32,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:16:32,781 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-20 22:16:32,781 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 22:16:32,782 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-20 22:16:32,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 22:16:32,782 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:16:32,783 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:16:32,995 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:16:32,996 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:16:32,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:16:32,997 INFO L82 PathProgramCache]: Analyzing trace with hash -971600090, now seen corresponding path program 2 times [2020-07-20 22:16:32,998 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:16:32,999 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2039780483] [2020-07-20 22:16:32,999 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) [2020-07-20 22:16:33,025 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:16:33,026 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:16:33,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 22:16:33,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:16:33,140 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 22:16:33,176 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:16:33,176 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:16:33,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:16:33,538 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:16:33,539 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2039780483] [2020-07-20 22:16:33,539 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:16:33,539 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2020-07-20 22:16:33,540 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1992533095] [2020-07-20 22:16:33,540 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 22:16:33,541 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:16:33,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 22:16:33,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=387, Unknown=0, NotChecked=0, Total=462 [2020-07-20 22:16:33,544 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 22 states. [2020-07-20 22:16:34,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:16:34,404 INFO L93 Difference]: Finished difference Result 44 states and 48 transitions. [2020-07-20 22:16:34,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-20 22:16:34,405 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 22 [2020-07-20 22:16:34,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:16:34,407 INFO L225 Difference]: With dead ends: 44 [2020-07-20 22:16:34,407 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 22:16:34,408 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=202, Invalid=1058, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 22:16:34,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 22:16:34,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 28. [2020-07-20 22:16:34,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 22:16:34,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-07-20 22:16:34,426 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 22 [2020-07-20 22:16:34,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:16:34,430 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-07-20 22:16:34,431 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 22:16:34,431 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-07-20 22:16:34,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 22:16:34,432 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:16:34,434 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:16:34,647 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:16:34,648 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:16:34,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:16:34,649 INFO L82 PathProgramCache]: Analyzing trace with hash -131462049, now seen corresponding path program 3 times [2020-07-20 22:16:34,649 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:16:34,650 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [605976296] [2020-07-20 22:16:34,651 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) [2020-07-20 22:16:34,681 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:16:34,681 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:16:34,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 9 conjunts are in the unsatisfiable core Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:16:34,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:16:34,758 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 10 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:16:34,758 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:16:34,857 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 10 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:16:34,857 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [605976296] [2020-07-20 22:16:34,858 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:16:34,858 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2020-07-20 22:16:34,858 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510010074] [2020-07-20 22:16:34,858 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 22:16:34,859 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:16:34,859 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 22:16:34,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=130, Unknown=0, NotChecked=0, Total=240 [2020-07-20 22:16:34,859 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 16 states. [2020-07-20 22:16:34,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:16:34,951 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-07-20 22:16:34,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 22:16:34,952 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 26 [2020-07-20 22:16:34,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:16:34,953 INFO L225 Difference]: With dead ends: 46 [2020-07-20 22:16:34,953 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 22:16:34,954 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=110, Invalid=130, Unknown=0, NotChecked=0, Total=240 [2020-07-20 22:16:34,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 22:16:34,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2020-07-20 22:16:34,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 22:16:34,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-07-20 22:16:34,965 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 26 [2020-07-20 22:16:34,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:16:34,966 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-07-20 22:16:34,966 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 22:16:34,966 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-07-20 22:16:34,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-20 22:16:34,969 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:16:34,969 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:16:35,183 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:16:35,184 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:16:35,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:16:35,184 INFO L82 PathProgramCache]: Analyzing trace with hash -682200363, now seen corresponding path program 4 times [2020-07-20 22:16:35,184 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:16:35,185 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1651007065] [2020-07-20 22:16:35,185 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:16:35,218 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 22:16:35,218 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 22:16:35,219 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 22:16:35,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 22:16:35,228 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 22:16:35,244 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 22:16:35,245 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 22:16:35,456 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:16:35,487 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 10:16:35 BoogieIcfgContainer [2020-07-20 22:16:35,487 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 22:16:35,489 INFO L168 Benchmark]: Toolchain (without parser) took 5308.94 ms. Allocated memory was 143.1 MB in the beginning and 253.2 MB in the end (delta: 110.1 MB). Free memory was 101.2 MB in the beginning and 222.4 MB in the end (delta: -121.2 MB). There was no memory consumed. Max. memory is 7.1 GB. [2020-07-20 22:16:35,490 INFO L168 Benchmark]: CDTParser took 0.52 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. [2020-07-20 22:16:35,491 INFO L168 Benchmark]: CACSL2BoogieTranslator took 283.56 ms. Allocated memory is still 143.1 MB. Free memory was 100.8 MB in the beginning and 91.4 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-07-20 22:16:35,492 INFO L168 Benchmark]: Boogie Preprocessor took 104.36 ms. Allocated memory was 143.1 MB in the beginning and 198.2 MB in the end (delta: 55.1 MB). Free memory was 91.4 MB in the beginning and 176.8 MB in the end (delta: -85.5 MB). Peak memory consumption was 11.0 MB. Max. memory is 7.1 GB. [2020-07-20 22:16:35,493 INFO L168 Benchmark]: RCFGBuilder took 238.30 ms. Allocated memory is still 198.2 MB. Free memory was 176.8 MB in the beginning and 164.9 MB in the end (delta: 11.9 MB). Peak memory consumption was 11.9 MB. Max. memory is 7.1 GB. [2020-07-20 22:16:35,494 INFO L168 Benchmark]: TraceAbstraction took 4677.41 ms. Allocated memory was 198.2 MB in the beginning and 253.2 MB in the end (delta: 55.1 MB). Free memory was 164.2 MB in the beginning and 222.4 MB in the end (delta: -58.2 MB). There was no memory consumed. Max. memory is 7.1 GB. [2020-07-20 22:16:35,498 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.52 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 283.56 ms. Allocated memory is still 143.1 MB. Free memory was 100.8 MB in the beginning and 91.4 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 104.36 ms. Allocated memory was 143.1 MB in the beginning and 198.2 MB in the end (delta: 55.1 MB). Free memory was 91.4 MB in the beginning and 176.8 MB in the end (delta: -85.5 MB). Peak memory consumption was 11.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 238.30 ms. Allocated memory is still 198.2 MB. Free memory was 176.8 MB in the beginning and 164.9 MB in the end (delta: 11.9 MB). Peak memory consumption was 11.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 4677.41 ms. Allocated memory was 198.2 MB in the beginning and 253.2 MB in the end (delta: 55.1 MB). Free memory was 164.2 MB in the beginning and 222.4 MB in the end (delta: -58.2 MB). There was no memory consumed. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int i, j=10, n=__VERIFIER_nondet_uint(), sn=0; [L12] int i, j=10, n=__VERIFIER_nondet_uint(), sn=0; [L13] i=1 VAL [i=1, j=10, n=6, n=0] [L13] COND TRUE i<=n VAL [i=1, j=10, n=6, n=0] [L14] COND TRUE i