/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/string-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-6598664 [2019-11-23 22:15:12,515 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-23 22:15:12,518 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-23 22:15:12,534 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-23 22:15:12,534 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-23 22:15:12,536 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-23 22:15:12,538 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-23 22:15:12,547 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-23 22:15:12,548 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-23 22:15:12,550 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-23 22:15:12,552 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-23 22:15:12,553 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-23 22:15:12,554 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-23 22:15:12,557 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-23 22:15:12,559 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-23 22:15:12,561 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-23 22:15:12,562 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-23 22:15:12,565 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-23 22:15:12,566 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-23 22:15:12,571 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-23 22:15:12,575 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-23 22:15:12,578 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-23 22:15:12,579 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-23 22:15:12,580 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-23 22:15:12,583 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-23 22:15:12,593 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-23 22:15:12,594 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-23 22:15:12,595 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-23 22:15:12,596 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 [2019-11-23 22:15:12,628 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-23 22:15:12,629 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-23 22:15:12,630 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-23 22:15:12,630 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-23 22:15:12,630 INFO L138 SettingsManager]: * Use SBE=true [2019-11-23 22:15:12,631 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-23 22:15:12,631 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-23 22:15:12,631 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-23 22:15:12,631 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-23 22:15:12,632 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-23 22:15:12,632 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-23 22:15:12,632 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-23 22:15:12,632 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-23 22:15:12,632 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2019-11-23 22:15:12,632 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-23 22:15:12,633 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-23 22:15:12,633 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-23 22:15:12,633 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-23 22:15:12,633 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-23 22:15:12,633 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-23 22:15:12,634 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-23 22:15:12,634 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-23 22:15:12,634 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-23 22:15:12,634 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-23 22:15:12,634 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-23 22:15:12,635 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-23 22:15:12,635 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-23 22:15:12,635 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-23 22:15:12,635 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-23 22:15:12,635 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-23 22:15:12,889 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-23 22:15:12,904 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-23 22:15:12,907 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-23 22:15:12,909 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-23 22:15:12,909 INFO L275 PluginConnector]: CDTParser initialized [2019-11-23 22:15:12,910 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-2.i [2019-11-23 22:15:12,985 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/37f9f6ee0/601ab47f3e7e4ced9d2b4dfbb652650e/FLAG670a55fd6 [2019-11-23 22:15:13,460 INFO L306 CDTParser]: Found 1 translation units. [2019-11-23 22:15:13,460 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/string-2.i [2019-11-23 22:15:13,469 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/37f9f6ee0/601ab47f3e7e4ced9d2b4dfbb652650e/FLAG670a55fd6 [2019-11-23 22:15:13,810 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/37f9f6ee0/601ab47f3e7e4ced9d2b4dfbb652650e [2019-11-23 22:15:13,820 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-23 22:15:13,821 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2019-11-23 22:15:13,822 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-23 22:15:13,822 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-23 22:15:13,827 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-23 22:15:13,828 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 10:15:13" (1/1) ... [2019-11-23 22:15:13,831 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@9ee21c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:15:13, skipping insertion in model container [2019-11-23 22:15:13,832 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 10:15:13" (1/1) ... [2019-11-23 22:15:13,839 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-23 22:15:13,862 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-23 22:15:14,063 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-23 22:15:14,068 INFO L203 MainTranslator]: Completed pre-run [2019-11-23 22:15:14,108 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-23 22:15:14,133 INFO L208 MainTranslator]: Completed translation [2019-11-23 22:15:14,133 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:15:14 WrapperNode [2019-11-23 22:15:14,134 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-23 22:15:14,134 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-23 22:15:14,134 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-23 22:15:14,134 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-23 22:15:14,141 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:15:14" (1/1) ... [2019-11-23 22:15:14,149 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:15:14" (1/1) ... [2019-11-23 22:15:14,251 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-23 22:15:14,252 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-23 22:15:14,252 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-23 22:15:14,252 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-23 22:15:14,262 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:15:14" (1/1) ... [2019-11-23 22:15:14,262 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:15:14" (1/1) ... [2019-11-23 22:15:14,264 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:15:14" (1/1) ... [2019-11-23 22:15:14,265 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:15:14" (1/1) ... [2019-11-23 22:15:14,273 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:15:14" (1/1) ... [2019-11-23 22:15:14,278 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:15:14" (1/1) ... [2019-11-23 22:15:14,280 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:15:14" (1/1) ... [2019-11-23 22:15:14,283 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-23 22:15:14,283 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-23 22:15:14,283 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-23 22:15:14,283 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-23 22:15:14,284 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:15:14" (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 [2019-11-23 22:15:14,342 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-23 22:15:14,342 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-23 22:15:14,343 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-23 22:15:14,343 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-23 22:15:14,343 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-23 22:15:14,343 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-23 22:15:14,604 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-23 22:15:14,605 INFO L284 CfgBuilder]: Removed 11 assume(true) statements. [2019-11-23 22:15:14,606 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 10:15:14 BoogieIcfgContainer [2019-11-23 22:15:14,606 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-23 22:15:14,607 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-23 22:15:14,608 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-23 22:15:14,611 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-23 22:15:14,611 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 10:15:13" (1/3) ... [2019-11-23 22:15:14,612 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@513e2bad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 10:15:14, skipping insertion in model container [2019-11-23 22:15:14,612 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 10:15:14" (2/3) ... [2019-11-23 22:15:14,613 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@513e2bad and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 10:15:14, skipping insertion in model container [2019-11-23 22:15:14,613 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 10:15:14" (3/3) ... [2019-11-23 22:15:14,615 INFO L109 eAbstractionObserver]: Analyzing ICFG string-2.i [2019-11-23 22:15:14,625 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-23 22:15:14,635 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-23 22:15:14,650 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-23 22:15:14,681 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-23 22:15:14,682 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-23 22:15:14,682 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-23 22:15:14,682 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-23 22:15:14,682 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-23 22:15:14,683 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-23 22:15:14,683 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-23 22:15:14,683 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-23 22:15:14,703 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2019-11-23 22:15:14,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-11-23 22:15:14,710 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:15:14,711 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:15:14,711 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:15:14,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:15:14,718 INFO L82 PathProgramCache]: Analyzing trace with hash 374782792, now seen corresponding path program 1 times [2019-11-23 22:15:14,728 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:15:14,729 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1667823043] [2019-11-23 22:15:14,729 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:15:14,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:15:14,864 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:15:14,865 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1667823043] [2019-11-23 22:15:14,865 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 22:15:14,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-23 22:15:14,867 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838416092] [2019-11-23 22:15:14,871 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-11-23 22:15:14,872 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:15:14,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-11-23 22:15:14,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-23 22:15:14,886 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 2 states. [2019-11-23 22:15:14,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:15:14,906 INFO L93 Difference]: Finished difference Result 48 states and 74 transitions. [2019-11-23 22:15:14,906 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-11-23 22:15:14,907 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 16 [2019-11-23 22:15:14,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:15:14,917 INFO L225 Difference]: With dead ends: 48 [2019-11-23 22:15:14,917 INFO L226 Difference]: Without dead ends: 22 [2019-11-23 22:15:14,921 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-23 22:15:14,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-11-23 22:15:14,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-11-23 22:15:14,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-11-23 22:15:14,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2019-11-23 22:15:14,954 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 16 [2019-11-23 22:15:14,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:15:14,955 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2019-11-23 22:15:14,955 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-11-23 22:15:14,955 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2019-11-23 22:15:14,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-11-23 22:15:14,956 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:15:14,957 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:15:14,957 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:15:14,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:15:14,958 INFO L82 PathProgramCache]: Analyzing trace with hash 1602331574, now seen corresponding path program 1 times [2019-11-23 22:15:14,958 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:15:14,958 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [853540566] [2019-11-23 22:15:14,959 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:15:14,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:15:15,019 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-23 22:15:15,020 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [853540566] [2019-11-23 22:15:15,020 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-23 22:15:15,020 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-23 22:15:15,021 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2042296276] [2019-11-23 22:15:15,022 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-23 22:15:15,023 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:15:15,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-23 22:15:15,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 22:15:15,024 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand 3 states. [2019-11-23 22:15:15,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:15:15,104 INFO L93 Difference]: Finished difference Result 50 states and 62 transitions. [2019-11-23 22:15:15,104 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-23 22:15:15,105 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2019-11-23 22:15:15,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:15:15,107 INFO L225 Difference]: With dead ends: 50 [2019-11-23 22:15:15,107 INFO L226 Difference]: Without dead ends: 32 [2019-11-23 22:15:15,108 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-23 22:15:15,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-11-23 22:15:15,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 24. [2019-11-23 22:15:15,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-23 22:15:15,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2019-11-23 22:15:15,115 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 18 [2019-11-23 22:15:15,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:15:15,116 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2019-11-23 22:15:15,116 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-23 22:15:15,116 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2019-11-23 22:15:15,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-11-23 22:15:15,117 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:15:15,117 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:15:15,118 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:15:15,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:15:15,118 INFO L82 PathProgramCache]: Analyzing trace with hash 177830358, now seen corresponding path program 1 times [2019-11-23 22:15:15,118 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:15:15,119 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [20018039] [2019-11-23 22:15:15,119 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:15:15,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:15:15,209 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-23 22:15:15,209 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [20018039] [2019-11-23 22:15:15,209 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [553857214] [2019-11-23 22:15:15,210 INFO L94 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 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:15:15,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:15:15,276 INFO L255 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-23 22:15:15,282 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:15:15,324 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-23 22:15:15,325 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:15:15,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2019-11-23 22:15:15,325 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239960742] [2019-11-23 22:15:15,327 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-23 22:15:15,328 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:15:15,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-23 22:15:15,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-11-23 22:15:15,330 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand 5 states. [2019-11-23 22:15:15,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:15:15,420 INFO L93 Difference]: Finished difference Result 61 states and 74 transitions. [2019-11-23 22:15:15,421 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-23 22:15:15,421 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 22 [2019-11-23 22:15:15,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:15:15,422 INFO L225 Difference]: With dead ends: 61 [2019-11-23 22:15:15,423 INFO L226 Difference]: Without dead ends: 42 [2019-11-23 22:15:15,423 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2019-11-23 22:15:15,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-11-23 22:15:15,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 28. [2019-11-23 22:15:15,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-11-23 22:15:15,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2019-11-23 22:15:15,429 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 22 [2019-11-23 22:15:15,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:15:15,430 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2019-11-23 22:15:15,430 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-23 22:15:15,430 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2019-11-23 22:15:15,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-11-23 22:15:15,431 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:15:15,431 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:15:15,639 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:15:15,640 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:15:15,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:15:15,641 INFO L82 PathProgramCache]: Analyzing trace with hash 1590720246, now seen corresponding path program 2 times [2019-11-23 22:15:15,642 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:15:15,643 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1088172833] [2019-11-23 22:15:15,643 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:15:15,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:15:15,737 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-23 22:15:15,737 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1088172833] [2019-11-23 22:15:15,737 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [210965735] [2019-11-23 22:15:15,738 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:15:15,796 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-23 22:15:15,797 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:15:15,797 INFO L255 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-23 22:15:15,800 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:15:15,817 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-23 22:15:15,818 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:15:15,818 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2019-11-23 22:15:15,818 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1545292679] [2019-11-23 22:15:15,820 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-23 22:15:15,820 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:15:15,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-23 22:15:15,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-11-23 22:15:15,822 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand 6 states. [2019-11-23 22:15:15,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:15:15,931 INFO L93 Difference]: Finished difference Result 73 states and 87 transitions. [2019-11-23 22:15:15,931 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-23 22:15:15,931 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 26 [2019-11-23 22:15:15,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:15:15,932 INFO L225 Difference]: With dead ends: 73 [2019-11-23 22:15:15,932 INFO L226 Difference]: Without dead ends: 52 [2019-11-23 22:15:15,933 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2019-11-23 22:15:15,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-11-23 22:15:15,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 32. [2019-11-23 22:15:15,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-11-23 22:15:15,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 37 transitions. [2019-11-23 22:15:15,939 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 37 transitions. Word has length 26 [2019-11-23 22:15:15,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:15:15,939 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 37 transitions. [2019-11-23 22:15:15,940 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-23 22:15:15,940 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 37 transitions. [2019-11-23 22:15:15,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-11-23 22:15:15,941 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:15:15,941 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:15:16,141 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:15:16,142 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:15:16,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:15:16,143 INFO L82 PathProgramCache]: Analyzing trace with hash -381068522, now seen corresponding path program 3 times [2019-11-23 22:15:16,143 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:15:16,144 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1090976068] [2019-11-23 22:15:16,145 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:15:16,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:15:16,235 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-23 22:15:16,235 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1090976068] [2019-11-23 22:15:16,236 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1909579723] [2019-11-23 22:15:16,236 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:15:16,286 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-11-23 22:15:16,287 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:15:16,287 INFO L255 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-23 22:15:16,289 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:15:16,305 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-11-23 22:15:16,306 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:15:16,306 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2019-11-23 22:15:16,306 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442019234] [2019-11-23 22:15:16,307 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-23 22:15:16,307 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:15:16,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-23 22:15:16,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2019-11-23 22:15:16,308 INFO L87 Difference]: Start difference. First operand 32 states and 37 transitions. Second operand 7 states. [2019-11-23 22:15:16,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:15:16,396 INFO L93 Difference]: Finished difference Result 85 states and 100 transitions. [2019-11-23 22:15:16,397 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-23 22:15:16,397 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 30 [2019-11-23 22:15:16,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:15:16,398 INFO L225 Difference]: With dead ends: 85 [2019-11-23 22:15:16,398 INFO L226 Difference]: Without dead ends: 62 [2019-11-23 22:15:16,399 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2019-11-23 22:15:16,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-11-23 22:15:16,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 36. [2019-11-23 22:15:16,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-23 22:15:16,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2019-11-23 22:15:16,405 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 30 [2019-11-23 22:15:16,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:15:16,405 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2019-11-23 22:15:16,405 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-23 22:15:16,406 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2019-11-23 22:15:16,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-11-23 22:15:16,407 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:15:16,407 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:15:16,610 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:15:16,610 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:15:16,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:15:16,611 INFO L82 PathProgramCache]: Analyzing trace with hash -583604682, now seen corresponding path program 4 times [2019-11-23 22:15:16,612 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:15:16,612 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1017163881] [2019-11-23 22:15:16,612 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:15:16,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-23 22:15:16,723 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-23 22:15:16,723 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1017163881] [2019-11-23 22:15:16,724 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1638164233] [2019-11-23 22:15:16,724 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:15:16,772 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-23 22:15:16,772 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-23 22:15:16,773 INFO L255 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-23 22:15:16,775 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-23 22:15:16,793 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-23 22:15:16,793 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-23 22:15:16,794 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2019-11-23 22:15:16,794 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770771630] [2019-11-23 22:15:16,794 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-23 22:15:16,795 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-23 22:15:16,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-23 22:15:16,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2019-11-23 22:15:16,795 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand 8 states. [2019-11-23 22:15:16,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-23 22:15:16,898 INFO L93 Difference]: Finished difference Result 95 states and 111 transitions. [2019-11-23 22:15:16,898 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-23 22:15:16,899 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 34 [2019-11-23 22:15:16,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-23 22:15:16,900 INFO L225 Difference]: With dead ends: 95 [2019-11-23 22:15:16,900 INFO L226 Difference]: Without dead ends: 70 [2019-11-23 22:15:16,900 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2019-11-23 22:15:16,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-11-23 22:15:16,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 40. [2019-11-23 22:15:16,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-11-23 22:15:16,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 45 transitions. [2019-11-23 22:15:16,906 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 45 transitions. Word has length 34 [2019-11-23 22:15:16,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-23 22:15:16,907 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 45 transitions. [2019-11-23 22:15:16,907 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-23 22:15:16,907 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 45 transitions. [2019-11-23 22:15:16,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-11-23 22:15:16,908 INFO L402 BasicCegarLoop]: Found error trace [2019-11-23 22:15:16,908 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-23 22:15:17,109 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-23 22:15:17,110 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-23 22:15:17,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-23 22:15:17,110 INFO L82 PathProgramCache]: Analyzing trace with hash -270804906, now seen corresponding path program 5 times [2019-11-23 22:15:17,111 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-23 22:15:17,111 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1572790329] [2019-11-23 22:15:17,111 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-23 22:15:17,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-23 22:15:17,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-23 22:15:17,233 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-11-23 22:15:17,233 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-11-23 22:15:17,274 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.11 10:15:17 BoogieIcfgContainer [2019-11-23 22:15:17,274 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-11-23 22:15:17,276 INFO L168 Benchmark]: Toolchain (without parser) took 3454.74 ms. Allocated memory was 139.5 MB in the beginning and 234.9 MB in the end (delta: 95.4 MB). Free memory was 104.4 MB in the beginning and 123.0 MB in the end (delta: -18.6 MB). Peak memory consumption was 76.8 MB. Max. memory is 7.1 GB. [2019-11-23 22:15:17,277 INFO L168 Benchmark]: CDTParser took 1.51 ms. Allocated memory is still 139.5 MB. Free memory was 122.6 MB in the beginning and 122.4 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2019-11-23 22:15:17,278 INFO L168 Benchmark]: CACSL2BoogieTranslator took 311.84 ms. Allocated memory is still 139.5 MB. Free memory was 104.1 MB in the beginning and 92.9 MB in the end (delta: 11.2 MB). Peak memory consumption was 11.2 MB. Max. memory is 7.1 GB. [2019-11-23 22:15:17,279 INFO L168 Benchmark]: Boogie Procedure Inliner took 117.29 ms. Allocated memory was 139.5 MB in the beginning and 203.4 MB in the end (delta: 64.0 MB). Free memory was 92.9 MB in the beginning and 181.6 MB in the end (delta: -88.6 MB). Peak memory consumption was 14.7 MB. Max. memory is 7.1 GB. [2019-11-23 22:15:17,280 INFO L168 Benchmark]: Boogie Preprocessor took 31.01 ms. Allocated memory is still 203.4 MB. Free memory was 181.6 MB in the beginning and 180.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2019-11-23 22:15:17,281 INFO L168 Benchmark]: RCFGBuilder took 323.43 ms. Allocated memory is still 203.4 MB. Free memory was 180.2 MB in the beginning and 162.9 MB in the end (delta: 17.3 MB). Peak memory consumption was 17.3 MB. Max. memory is 7.1 GB. [2019-11-23 22:15:17,281 INFO L168 Benchmark]: TraceAbstraction took 2666.59 ms. Allocated memory was 203.4 MB in the beginning and 234.9 MB in the end (delta: 31.5 MB). Free memory was 162.3 MB in the beginning and 123.0 MB in the end (delta: 39.3 MB). Peak memory consumption was 70.8 MB. Max. memory is 7.1 GB. [2019-11-23 22:15:17,286 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.51 ms. Allocated memory is still 139.5 MB. Free memory was 122.6 MB in the beginning and 122.4 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 311.84 ms. Allocated memory is still 139.5 MB. Free memory was 104.1 MB in the beginning and 92.9 MB in the end (delta: 11.2 MB). Peak memory consumption was 11.2 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 117.29 ms. Allocated memory was 139.5 MB in the beginning and 203.4 MB in the end (delta: 64.0 MB). Free memory was 92.9 MB in the beginning and 181.6 MB in the end (delta: -88.6 MB). Peak memory consumption was 14.7 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 31.01 ms. Allocated memory is still 203.4 MB. Free memory was 181.6 MB in the beginning and 180.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 323.43 ms. Allocated memory is still 203.4 MB. Free memory was 180.2 MB in the beginning and 162.9 MB in the end (delta: 17.3 MB). Peak memory consumption was 17.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2666.59 ms. Allocated memory was 203.4 MB in the beginning and 234.9 MB in the end (delta: 31.5 MB). Free memory was 162.3 MB in the beginning and 123.0 MB in the end (delta: 39.3 MB). Peak memory consumption was 70.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 6]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: overapproximation of shiftLeft at line 55. Possible FailurePath: [L17] char string_A[5], string_B[5]; [L18] int i, j, nc_A, nc_B, found=0; [L21] i=0 [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND TRUE i<5 [L22] string_A[i]=__VERIFIER_nondet_char() [L21] i++ [L21] COND FALSE !(i<5) [L23] EXPR string_A[5 -1] [L23] COND FALSE !(!(string_A[5 -1]=='\0')) [L25] i=0 [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND TRUE i<5 [L26] string_B[i]=__VERIFIER_nondet_char() [L25] i++ [L25] COND FALSE !(i<5) [L27] EXPR string_B[5 -1] [L27] COND FALSE !(!(string_B[5 -1]=='\0')) [L29] nc_A = 0 [L30] EXPR string_A[nc_A] [L30] COND FALSE !(string_A[nc_A]!='\0') [L33] nc_B = 0 [L34] EXPR string_B[nc_B] [L34] COND FALSE !(string_B[nc_B]!='\0') [L37] COND FALSE !(!(nc_B >= nc_A)) [L40] EXPR j=0 [L40] i=j=0 [L41] COND FALSE !((inc_B-1)<