/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 NOT_INCREMENTALLY -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 11:48:07,783 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 11:48:07,786 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 11:48:07,800 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 11:48:07,801 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 11:48:07,802 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 11:48:07,804 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 11:48:07,806 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 11:48:07,808 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 11:48:07,809 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 11:48:07,811 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 11:48:07,812 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 11:48:07,813 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 11:48:07,814 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 11:48:07,815 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 11:48:07,817 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 11:48:07,818 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 11:48:07,819 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 11:48:07,821 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 11:48:07,823 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 11:48:07,825 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 11:48:07,827 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 11:48:07,828 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 11:48:07,829 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 11:48:07,832 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 11:48:07,841 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 11:48:07,842 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 11:48:07,843 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 11:48:07,844 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 11:48:07,861 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 11:48:07,861 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 11:48:07,863 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 11:48:07,863 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 11:48:07,863 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 11:48:07,864 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 11:48:07,864 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 11:48:07,864 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 11:48:07,864 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 11:48:07,864 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 11:48:07,865 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 11:48:07,865 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 11:48:07,865 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 11:48:07,865 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 11:48:07,866 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 11:48:07,866 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 11:48:07,866 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 11:48:07,866 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 11:48:07,866 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 11:48:07,867 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 11:48:07,867 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 11:48:07,867 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:48:07,867 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 11:48:07,868 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 11:48:07,868 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 11:48:07,868 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 11:48:07,868 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:07,868 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 11:48:07,869 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 11:48:07,869 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 -> NOT_INCREMENTALLY [2020-07-20 11:48:08,172 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 11:48:08,187 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 11:48:08,191 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 11:48:08,193 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 11:48:08,193 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 11:48:08,194 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum01_bug02.i [2020-07-20 11:48:08,276 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7c71ae330/8f3a221e40c1437bb6b8a9d9d673ff3d/FLAGc81aacf80 [2020-07-20 11:48:08,797 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 11:48:08,799 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01_bug02.i [2020-07-20 11:48:08,807 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7c71ae330/8f3a221e40c1437bb6b8a9d9d673ff3d/FLAGc81aacf80 [2020-07-20 11:48:09,191 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7c71ae330/8f3a221e40c1437bb6b8a9d9d673ff3d [2020-07-20 11:48:09,204 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:48:09,208 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:48:09,209 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:48:09,210 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:48:09,215 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:48:09,217 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:48:09" (1/1) ... [2020-07-20 11:48:09,221 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@eafe90 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:09, skipping insertion in model container [2020-07-20 11:48:09,221 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:48:09" (1/1) ... [2020-07-20 11:48:09,232 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:48:09,251 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:48:09,434 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:48:09,440 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:48:09,457 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:48:09,472 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:48:09,472 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:09 WrapperNode [2020-07-20 11:48:09,472 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:48:09,473 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:48:09,473 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:48:09,474 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:48:09,485 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:09" (1/1) ... [2020-07-20 11:48:09,486 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:09" (1/1) ... [2020-07-20 11:48:09,491 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:09" (1/1) ... [2020-07-20 11:48:09,492 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:09" (1/1) ... [2020-07-20 11:48:09,497 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:09" (1/1) ... [2020-07-20 11:48:09,503 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:09" (1/1) ... [2020-07-20 11:48:09,504 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:09" (1/1) ... [2020-07-20 11:48:09,591 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:48:09,593 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:48:09,593 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:48:09,593 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:48:09,596 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:09" (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 11:48:09,683 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:48:09,683 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:48:09,683 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 11:48:09,683 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:48:09,684 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:48:09,684 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 11:48:09,684 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-20 11:48:09,686 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:48:09,686 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:48:09,686 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:48:09,915 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:48:09,916 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 11:48:09,921 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:48:09 BoogieIcfgContainer [2020-07-20 11:48:09,922 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:48:09,939 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:48:09,940 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:48:09,952 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:48:09,955 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:48:09" (1/3) ... [2020-07-20 11:48:09,956 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26587e86 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:48:09, skipping insertion in model container [2020-07-20 11:48:09,957 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:48:09" (2/3) ... [2020-07-20 11:48:09,960 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@26587e86 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:48:09, skipping insertion in model container [2020-07-20 11:48:09,960 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:48:09" (3/3) ... [2020-07-20 11:48:09,966 INFO L109 eAbstractionObserver]: Analyzing ICFG sum01_bug02.i [2020-07-20 11:48:09,999 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:48:10,010 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:48:10,031 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:48:10,061 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:48:10,062 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:48:10,062 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:48:10,062 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:48:10,063 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:48:10,063 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:48:10,063 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:48:10,063 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:48:10,090 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-20 11:48:10,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-20 11:48:10,103 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:48:10,105 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:48:10,106 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:48:10,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:48:10,112 INFO L82 PathProgramCache]: Analyzing trace with hash -146959038, now seen corresponding path program 1 times [2020-07-20 11:48:10,121 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:48:10,121 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [218505047] [2020-07-20 11:48:10,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:48:10,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:48:10,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 11:48:10,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:48:10,208 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 11:48:10,209 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:48:10,210 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [218505047] [2020-07-20 11:48:10,212 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:48:10,212 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 11:48:10,214 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1694444873] [2020-07-20 11:48:10,220 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 11:48:10,220 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:48:10,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 11:48:10,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 11:48:10,240 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2020-07-20 11:48:10,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:48:10,268 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2020-07-20 11:48:10,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 11:48:10,270 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-07-20 11:48:10,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:48:10,279 INFO L225 Difference]: With dead ends: 31 [2020-07-20 11:48:10,279 INFO L226 Difference]: Without dead ends: 14 [2020-07-20 11:48:10,283 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 11:48:10,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-07-20 11:48:10,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-07-20 11:48:10,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-07-20 11:48:10,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2020-07-20 11:48:10,327 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2020-07-20 11:48:10,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:48:10,328 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2020-07-20 11:48:10,328 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 11:48:10,328 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2020-07-20 11:48:10,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-20 11:48:10,329 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:48:10,329 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:48:10,544 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:10,545 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:48:10,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:48:10,546 INFO L82 PathProgramCache]: Analyzing trace with hash -158964811, now seen corresponding path program 1 times [2020-07-20 11:48:10,547 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:48:10,547 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1507304062] [2020-07-20 11:48:10,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:48:10,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:48:10,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 11:48:10,581 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:48:10,655 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 11:48:10,655 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:48:10,656 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1507304062] [2020-07-20 11:48:10,656 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:48:10,656 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 11:48:10,657 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091839780] [2020-07-20 11:48:10,659 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 11:48:10,659 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:48:10,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 11:48:10,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:48:10,660 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 5 states. [2020-07-20 11:48:10,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:48:10,721 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2020-07-20 11:48:10,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 11:48:10,722 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-07-20 11:48:10,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:48:10,723 INFO L225 Difference]: With dead ends: 23 [2020-07-20 11:48:10,723 INFO L226 Difference]: Without dead ends: 18 [2020-07-20 11:48:10,724 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 11:48:10,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-20 11:48:10,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-20 11:48:10,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 11:48:10,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-07-20 11:48:10,731 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 10 [2020-07-20 11:48:10,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:48:10,732 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-07-20 11:48:10,732 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 11:48:10,732 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-07-20 11:48:10,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 11:48:10,733 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:48:10,733 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:48:10,947 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:10,949 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:48:10,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:48:10,950 INFO L82 PathProgramCache]: Analyzing trace with hash 1017948080, now seen corresponding path program 1 times [2020-07-20 11:48:10,951 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:48:10,951 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [377798341] [2020-07-20 11:48:10,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:10,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:48:10,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 11:48:10,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:48:11,113 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 11:48:11,154 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 11:48:11,155 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:48:11,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:48:11,414 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 11:48:11,420 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [377798341] [2020-07-20 11:48:11,421 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:48:11,421 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2020-07-20 11:48:11,421 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900507579] [2020-07-20 11:48:11,422 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 11:48:11,423 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:48:11,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 11:48:11,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2020-07-20 11:48:11,425 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 14 states. [2020-07-20 11:48:11,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:48:11,819 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2020-07-20 11:48:11,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 11:48:11,820 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 14 [2020-07-20 11:48:11,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:48:11,821 INFO L225 Difference]: With dead ends: 39 [2020-07-20 11:48:11,821 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 11:48:11,823 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=70, Invalid=236, Unknown=0, NotChecked=0, Total=306 [2020-07-20 11:48:11,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 11:48:11,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 27. [2020-07-20 11:48:11,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-20 11:48:11,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2020-07-20 11:48:11,831 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 14 [2020-07-20 11:48:11,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:48:11,832 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2020-07-20 11:48:11,832 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 11:48:11,832 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2020-07-20 11:48:11,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 11:48:11,833 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:48:11,833 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:48:12,046 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:12,047 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:48:12,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:48:12,048 INFO L82 PathProgramCache]: Analyzing trace with hash -852639511, now seen corresponding path program 1 times [2020-07-20 11:48:12,048 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:48:12,049 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1301493809] [2020-07-20 11:48:12,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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) [2020-07-20 11:48:12,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:48:12,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 3 conjunts are in the unsatisfiable core Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:12,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:48:12,094 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 11:48:12,094 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:48:12,094 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1301493809] [2020-07-20 11:48:12,095 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:48:12,095 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 11:48:12,095 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231094136] [2020-07-20 11:48:12,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 11:48:12,096 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:48:12,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 11:48:12,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 11:48:12,097 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 3 states. [2020-07-20 11:48:12,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:48:12,121 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2020-07-20 11:48:12,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 11:48:12,123 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-07-20 11:48:12,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:48:12,124 INFO L225 Difference]: With dead ends: 36 [2020-07-20 11:48:12,124 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 11:48:12,125 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 11:48:12,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 11:48:12,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-07-20 11:48:12,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-20 11:48:12,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2020-07-20 11:48:12,131 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 18 [2020-07-20 11:48:12,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:48:12,132 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2020-07-20 11:48:12,132 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 11:48:12,132 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2020-07-20 11:48:12,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 11:48:12,133 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:48:12,133 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:48:12,347 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:12,349 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:48:12,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:48:12,350 INFO L82 PathProgramCache]: Analyzing trace with hash -1920151575, now seen corresponding path program 2 times [2020-07-20 11:48:12,351 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:48:12,351 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1217332723] [2020-07-20 11:48:12,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:12,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:48:12,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 11:48:12,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:48:12,437 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 11:48:12,438 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:48:12,476 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 11:48:12,476 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1217332723] [2020-07-20 11:48:12,477 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:48:12,477 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2020-07-20 11:48:12,477 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075038564] [2020-07-20 11:48:12,478 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 11:48:12,478 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:48:12,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 11:48:12,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-07-20 11:48:12,479 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 8 states. [2020-07-20 11:48:12,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:48:12,529 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2020-07-20 11:48:12,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 11:48:12,530 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2020-07-20 11:48:12,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:48:12,531 INFO L225 Difference]: With dead ends: 36 [2020-07-20 11:48:12,531 INFO L226 Difference]: Without dead ends: 27 [2020-07-20 11:48:12,532 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 11:48:12,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-20 11:48:12,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2020-07-20 11:48:12,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-20 11:48:12,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-20 11:48:12,538 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 18 [2020-07-20 11:48:12,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:48:12,538 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-20 11:48:12,538 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 11:48:12,538 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-20 11:48:12,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 11:48:12,539 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:48:12,539 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:48:12,740 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:12,741 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:48:12,741 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:48:12,742 INFO L82 PathProgramCache]: Analyzing trace with hash -971600090, now seen corresponding path program 2 times [2020-07-20 11:48:12,742 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:48:12,743 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [98592196] [2020-07-20 11:48:12,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:12,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:48:12,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 11:48:12,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:48:12,931 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 11:48:12,968 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 11:48:12,968 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:48:13,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 11:48:13,374 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 11:48:13,375 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [98592196] [2020-07-20 11:48:13,376 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:48:13,376 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2020-07-20 11:48:13,376 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [761779626] [2020-07-20 11:48:13,377 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 11:48:13,377 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:48:13,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 11:48:13,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=387, Unknown=0, NotChecked=0, Total=462 [2020-07-20 11:48:13,379 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 22 states. [2020-07-20 11:48:14,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:48:14,352 INFO L93 Difference]: Finished difference Result 44 states and 48 transitions. [2020-07-20 11:48:14,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-20 11:48:14,353 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 22 [2020-07-20 11:48:14,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:48:14,356 INFO L225 Difference]: With dead ends: 44 [2020-07-20 11:48:14,357 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 11:48:14,358 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 167 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=202, Invalid=1058, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 11:48:14,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 11:48:14,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 28. [2020-07-20 11:48:14,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 11:48:14,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-07-20 11:48:14,367 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 22 [2020-07-20 11:48:14,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:48:14,368 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-07-20 11:48:14,368 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 11:48:14,368 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-07-20 11:48:14,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 11:48:14,369 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:48:14,369 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:48:14,584 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:14,585 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:48:14,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:48:14,586 INFO L82 PathProgramCache]: Analyzing trace with hash -131462049, now seen corresponding path program 3 times [2020-07-20 11:48:14,587 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:48:14,587 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1592301490] [2020-07-20 11:48:14,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:48:14,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:48:14,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 11:48:14,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:48:14,699 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 11:48:14,700 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:48:14,817 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 11:48:14,818 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1592301490] [2020-07-20 11:48:14,818 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:48:14,818 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2020-07-20 11:48:14,819 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1937796527] [2020-07-20 11:48:14,819 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 11:48:14,820 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:48:14,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 11:48:14,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=130, Unknown=0, NotChecked=0, Total=240 [2020-07-20 11:48:14,821 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 16 states. [2020-07-20 11:48:14,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:48:14,899 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-07-20 11:48:14,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:48:14,899 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 26 [2020-07-20 11:48:14,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:48:14,900 INFO L225 Difference]: With dead ends: 46 [2020-07-20 11:48:14,901 INFO L226 Difference]: Without dead ends: 37 [2020-07-20 11:48:14,901 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 11:48:14,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-20 11:48:14,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2020-07-20 11:48:14,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 11:48:14,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-07-20 11:48:14,909 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 26 [2020-07-20 11:48:14,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:48:14,909 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-07-20 11:48:14,909 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 11:48:14,909 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-07-20 11:48:14,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-20 11:48:14,910 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:48:14,911 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:48:15,116 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:15,117 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:48:15,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:48:15,118 INFO L82 PathProgramCache]: Analyzing trace with hash -682200363, now seen corresponding path program 4 times [2020-07-20 11:48:15,121 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:48:15,122 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [482098479] [2020-07-20 11:48:15,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:15,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 11:48:15,152 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 11:48:15,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 11:48:15,163 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 11:48:15,193 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 11:48:15,193 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 11:48:15,405 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:48:15,438 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 11:48:15 BoogieIcfgContainer [2020-07-20 11:48:15,438 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 11:48:15,441 INFO L168 Benchmark]: Toolchain (without parser) took 6233.99 ms. Allocated memory was 138.4 MB in the beginning and 247.5 MB in the end (delta: 109.1 MB). Free memory was 103.3 MB in the beginning and 195.8 MB in the end (delta: -92.5 MB). Peak memory consumption was 16.6 MB. Max. memory is 7.1 GB. [2020-07-20 11:48:15,442 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 138.4 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. [2020-07-20 11:48:15,443 INFO L168 Benchmark]: CACSL2BoogieTranslator took 263.61 ms. Allocated memory is still 138.4 MB. Free memory was 103.1 MB in the beginning and 93.6 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-07-20 11:48:15,444 INFO L168 Benchmark]: Boogie Preprocessor took 117.56 ms. Allocated memory was 138.4 MB in the beginning and 202.4 MB in the end (delta: 64.0 MB). Free memory was 93.6 MB in the beginning and 182.4 MB in the end (delta: -88.8 MB). Peak memory consumption was 15.0 MB. Max. memory is 7.1 GB. [2020-07-20 11:48:15,444 INFO L168 Benchmark]: RCFGBuilder took 329.03 ms. Allocated memory is still 202.4 MB. Free memory was 181.5 MB in the beginning and 169.1 MB in the end (delta: 12.4 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. [2020-07-20 11:48:15,446 INFO L168 Benchmark]: TraceAbstraction took 5498.57 ms. Allocated memory was 202.4 MB in the beginning and 247.5 MB in the end (delta: 45.1 MB). Free memory was 169.1 MB in the beginning and 195.8 MB in the end (delta: -26.6 MB). Peak memory consumption was 18.5 MB. Max. memory is 7.1 GB. [2020-07-20 11:48:15,450 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 138.4 MB. Free memory was 121.5 MB in the beginning and 121.3 MB in the end (delta: 209.9 kB). Peak memory consumption was 209.9 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 263.61 ms. Allocated memory is still 138.4 MB. Free memory was 103.1 MB in the beginning and 93.6 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 117.56 ms. Allocated memory was 138.4 MB in the beginning and 202.4 MB in the end (delta: 64.0 MB). Free memory was 93.6 MB in the beginning and 182.4 MB in the end (delta: -88.8 MB). Peak memory consumption was 15.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 329.03 ms. Allocated memory is still 202.4 MB. Free memory was 181.5 MB in the beginning and 169.1 MB in the end (delta: 12.4 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 5498.57 ms. Allocated memory was 202.4 MB in the beginning and 247.5 MB in the end (delta: 45.1 MB). Free memory was 169.1 MB in the beginning and 195.8 MB in the end (delta: -26.6 MB). Peak memory consumption was 18.5 MB. 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