/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/string-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 17:41:53,885 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 17:41:53,887 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 17:41:53,907 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 17:41:53,907 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 17:41:53,909 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 17:41:53,911 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 17:41:53,921 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 17:41:53,924 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 17:41:53,925 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 17:41:53,927 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 17:41:53,928 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 17:41:53,929 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 17:41:53,933 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 17:41:53,935 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 17:41:53,937 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 17:41:53,940 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 17:41:53,942 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 17:41:53,943 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 17:41:53,945 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 17:41:53,946 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 17:41:53,947 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 17:41:53,948 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 17:41:53,949 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 17:41:53,951 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 17:41:53,959 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 17:41:53,960 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 17:41:53,960 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 17:41:53,961 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 17:41:53,976 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 17:41:53,976 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 17:41:53,977 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 17:41:53,978 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 17:41:53,978 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 17:41:53,978 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 17:41:53,978 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 17:41:53,978 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 17:41:53,979 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 17:41:53,979 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 17:41:53,979 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 17:41:53,979 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 17:41:53,979 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 17:41:53,980 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 17:41:53,980 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 17:41:53,980 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 17:41:53,980 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 17:41:53,980 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 17:41:53,981 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 17:41:53,981 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 17:41:53,981 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 17:41:53,981 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:41:53,981 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 17:41:53,982 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 17:41:53,982 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 17:41:53,982 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 17:41:53,982 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:41:53,982 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 17:41:53,983 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 17:41:53,983 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 17:41:54,294 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 17:41:54,308 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 17:41:54,312 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 17:41:54,314 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 17:41:54,314 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 17:41:54,315 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/string-2.i [2020-07-20 17:41:54,381 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/95532f804/bc5480ba32ff4a0f8088dbf521f88f17/FLAG763ffff61 [2020-07-20 17:41:54,783 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 17:41:54,784 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/string-2.i [2020-07-20 17:41:54,798 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/95532f804/bc5480ba32ff4a0f8088dbf521f88f17/FLAG763ffff61 [2020-07-20 17:41:55,171 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/95532f804/bc5480ba32ff4a0f8088dbf521f88f17 [2020-07-20 17:41:55,183 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 17:41:55,186 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 17:41:55,188 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 17:41:55,188 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 17:41:55,193 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 17:41:55,194 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:41:55" (1/1) ... [2020-07-20 17:41:55,197 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1f41f43f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:41:55, skipping insertion in model container [2020-07-20 17:41:55,198 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:41:55" (1/1) ... [2020-07-20 17:41:55,206 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 17:41:55,226 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 17:41:55,424 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:41:55,429 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 17:41:55,459 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:41:55,482 INFO L208 MainTranslator]: Completed translation [2020-07-20 17:41:55,482 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:41:55 WrapperNode [2020-07-20 17:41:55,483 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 17:41:55,484 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 17:41:55,484 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 17:41:55,484 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 17:41:55,668 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:41:55" (1/1) ... [2020-07-20 17:41:55,668 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:41:55" (1/1) ... [2020-07-20 17:41:55,679 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:41:55" (1/1) ... [2020-07-20 17:41:55,680 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:41:55" (1/1) ... [2020-07-20 17:41:55,691 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:41:55" (1/1) ... [2020-07-20 17:41:55,698 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:41:55" (1/1) ... [2020-07-20 17:41:55,700 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:41:55" (1/1) ... [2020-07-20 17:41:55,703 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 17:41:55,704 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 17:41:55,704 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 17:41:55,704 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 17:41:55,706 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:41:55" (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 17:41:55,797 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 17:41:55,798 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 17:41:55,798 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 17:41:55,798 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 17:41:55,798 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 17:41:55,799 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 17:41:55,799 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 17:41:55,800 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 17:41:55,800 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 17:41:55,800 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_char [2020-07-20 17:41:55,801 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 17:41:55,801 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-20 17:41:55,802 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-07-20 17:41:55,802 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-07-20 17:41:55,802 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-20 17:41:55,803 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 17:41:55,803 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 17:41:56,196 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 17:41:56,196 INFO L295 CfgBuilder]: Removed 5 assume(true) statements. [2020-07-20 17:41:56,200 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:41:56 BoogieIcfgContainer [2020-07-20 17:41:56,200 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 17:41:56,201 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 17:41:56,201 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 17:41:56,204 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 17:41:56,204 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:41:55" (1/3) ... [2020-07-20 17:41:56,205 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37fd528a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:41:56, skipping insertion in model container [2020-07-20 17:41:56,205 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:41:55" (2/3) ... [2020-07-20 17:41:56,206 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37fd528a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:41:56, skipping insertion in model container [2020-07-20 17:41:56,206 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:41:56" (3/3) ... [2020-07-20 17:41:56,208 INFO L109 eAbstractionObserver]: Analyzing ICFG string-2.i [2020-07-20 17:41:56,218 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 17:41:56,225 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 17:41:56,238 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 17:41:56,266 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 17:41:56,266 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 17:41:56,267 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 17:41:56,267 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 17:41:56,267 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 17:41:56,267 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 17:41:56,267 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 17:41:56,267 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 17:41:56,289 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states. [2020-07-20 17:41:56,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-20 17:41:56,297 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:41:56,298 INFO L422 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] [2020-07-20 17:41:56,298 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:41:56,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:41:56,306 INFO L82 PathProgramCache]: Analyzing trace with hash -522531256, now seen corresponding path program 1 times [2020-07-20 17:41:56,316 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:41:56,316 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1108997810] [2020-07-20 17:41:56,317 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:41:56,421 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:41:56,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:41:56,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-20 17:41:56,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:41:56,460 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 17:41:56,460 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:41:56,462 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1108997810] [2020-07-20 17:41:56,462 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:41:56,463 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-20 17:41:56,464 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433497941] [2020-07-20 17:41:56,471 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-20 17:41:56,471 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:41:56,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-20 17:41:56,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-20 17:41:56,492 INFO L87 Difference]: Start difference. First operand 35 states. Second operand 2 states. [2020-07-20 17:41:56,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:41:56,521 INFO L93 Difference]: Finished difference Result 62 states and 89 transitions. [2020-07-20 17:41:56,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-20 17:41:56,523 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 22 [2020-07-20 17:41:56,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:41:56,533 INFO L225 Difference]: With dead ends: 62 [2020-07-20 17:41:56,534 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 17:41:56,538 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 21 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 17:41:56,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 17:41:56,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-20 17:41:56,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-20 17:41:56,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2020-07-20 17:41:56,585 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 22 [2020-07-20 17:41:56,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:41:56,586 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2020-07-20 17:41:56,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-20 17:41:56,587 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2020-07-20 17:41:56,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-20 17:41:56,588 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:41:56,589 INFO L422 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, 1, 1] [2020-07-20 17:41:56,802 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:41:56,802 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:41:56,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:41:56,803 INFO L82 PathProgramCache]: Analyzing trace with hash 1282672092, now seen corresponding path program 1 times [2020-07-20 17:41:56,803 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:41:56,803 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1081688187] [2020-07-20 17:41:56,804 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:41:56,908 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:41:56,908 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:41:56,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-20 17:41:56,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:41:56,965 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 17:41:56,966 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:41:56,966 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1081688187] [2020-07-20 17:41:56,967 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:41:56,967 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 17:41:56,968 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003278797] [2020-07-20 17:41:56,970 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 17:41:56,971 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:41:56,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 17:41:56,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 17:41:56,972 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand 3 states. [2020-07-20 17:41:57,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:41:57,047 INFO L93 Difference]: Finished difference Result 56 states and 69 transitions. [2020-07-20 17:41:57,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 17:41:57,050 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-20 17:41:57,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:41:57,055 INFO L225 Difference]: With dead ends: 56 [2020-07-20 17:41:57,055 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 17:41:57,057 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 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 17:41:57,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 17:41:57,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 30. [2020-07-20 17:41:57,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-20 17:41:57,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2020-07-20 17:41:57,075 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 24 [2020-07-20 17:41:57,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:41:57,076 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2020-07-20 17:41:57,077 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 17:41:57,077 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2020-07-20 17:41:57,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 17:41:57,080 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:41:57,083 INFO L422 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, 1, 1, 1, 1, 1, 1] [2020-07-20 17:41:57,296 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:41:57,298 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:41:57,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:41:57,299 INFO L82 PathProgramCache]: Analyzing trace with hash -1816798436, now seen corresponding path program 1 times [2020-07-20 17:41:57,299 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:41:57,300 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1677371702] [2020-07-20 17:41:57,301 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:41:57,362 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:41:57,362 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:41:57,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:41:57,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:41:57,396 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 17:41:57,396 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:41:57,451 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 17:41:57,452 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1677371702] [2020-07-20 17:41:57,452 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:41:57,452 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-20 17:41:57,453 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57153877] [2020-07-20 17:41:57,453 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 17:41:57,454 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:41:57,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 17:41:57,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-20 17:41:57,455 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 6 states. [2020-07-20 17:41:57,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:41:57,578 INFO L93 Difference]: Finished difference Result 79 states and 102 transitions. [2020-07-20 17:41:57,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 17:41:57,579 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-07-20 17:41:57,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:41:57,580 INFO L225 Difference]: With dead ends: 79 [2020-07-20 17:41:57,581 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 17:41:57,582 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-07-20 17:41:57,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 17:41:57,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 42. [2020-07-20 17:41:57,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-20 17:41:57,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2020-07-20 17:41:57,608 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 28 [2020-07-20 17:41:57,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:41:57,608 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2020-07-20 17:41:57,608 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 17:41:57,609 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2020-07-20 17:41:57,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-20 17:41:57,610 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:41:57,610 INFO L422 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, 1, 1, 1, 1, 1, 1] [2020-07-20 17:41:57,824 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:41:57,825 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:41:57,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:41:57,826 INFO L82 PathProgramCache]: Analyzing trace with hash -1106103076, now seen corresponding path program 2 times [2020-07-20 17:41:57,827 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:41:57,828 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1304247940] [2020-07-20 17:41:57,828 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:41:57,931 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:41:57,932 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:41:57,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 17:41:57,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:41:57,990 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 17:41:57,990 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:41:58,035 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-20 17:41:58,036 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1304247940] [2020-07-20 17:41:58,036 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:41:58,036 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 7 [2020-07-20 17:41:58,036 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [332131992] [2020-07-20 17:41:58,037 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-20 17:41:58,037 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:41:58,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-20 17:41:58,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-07-20 17:41:58,038 INFO L87 Difference]: Start difference. First operand 42 states and 47 transitions. Second operand 7 states. [2020-07-20 17:41:58,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:41:58,156 INFO L93 Difference]: Finished difference Result 93 states and 114 transitions. [2020-07-20 17:41:58,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 17:41:58,157 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 40 [2020-07-20 17:41:58,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:41:58,158 INFO L225 Difference]: With dead ends: 93 [2020-07-20 17:41:58,158 INFO L226 Difference]: Without dead ends: 66 [2020-07-20 17:41:58,159 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 69 SyntacticMatches, 5 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-07-20 17:41:58,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-07-20 17:41:58,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 46. [2020-07-20 17:41:58,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 17:41:58,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 51 transitions. [2020-07-20 17:41:58,167 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 51 transitions. Word has length 40 [2020-07-20 17:41:58,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:41:58,168 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 51 transitions. [2020-07-20 17:41:58,168 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-20 17:41:58,168 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 51 transitions. [2020-07-20 17:41:58,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-07-20 17:41:58,169 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:41:58,169 INFO L422 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, 1, 1, 1, 1, 1, 1] [2020-07-20 17:41:58,384 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:41:58,385 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:41:58,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:41:58,386 INFO L82 PathProgramCache]: Analyzing trace with hash 1061537308, now seen corresponding path program 3 times [2020-07-20 17:41:58,386 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:41:58,387 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1736362332] [2020-07-20 17:41:58,387 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:41:58,562 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:41:58,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-20 17:41:58,562 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 17:41:58,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-20 17:41:58,636 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-20 17:41:58,670 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-20 17:41:58,671 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-20 17:41:58,881 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:41:58,932 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 05:41:58 BoogieIcfgContainer [2020-07-20 17:41:58,933 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-20 17:41:58,936 INFO L168 Benchmark]: Toolchain (without parser) took 3750.29 ms. Allocated memory was 145.8 MB in the beginning and 232.8 MB in the end (delta: 87.0 MB). Free memory was 101.9 MB in the beginning and 144.7 MB in the end (delta: -42.8 MB). Peak memory consumption was 44.3 MB. Max. memory is 7.1 GB. [2020-07-20 17:41:58,937 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 145.8 MB. Free memory was 120.7 MB in the beginning and 120.5 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. [2020-07-20 17:41:58,938 INFO L168 Benchmark]: CACSL2BoogieTranslator took 295.58 ms. Allocated memory is still 145.8 MB. Free memory was 101.5 MB in the beginning and 90.7 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. [2020-07-20 17:41:58,939 INFO L168 Benchmark]: Boogie Preprocessor took 219.99 ms. Allocated memory was 145.8 MB in the beginning and 207.6 MB in the end (delta: 61.9 MB). Free memory was 90.7 MB in the beginning and 185.0 MB in the end (delta: -94.3 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. [2020-07-20 17:41:58,940 INFO L168 Benchmark]: RCFGBuilder took 496.50 ms. Allocated memory is still 207.6 MB. Free memory was 185.0 MB in the beginning and 165.7 MB in the end (delta: 19.3 MB). Peak memory consumption was 19.3 MB. Max. memory is 7.1 GB. [2020-07-20 17:41:58,942 INFO L168 Benchmark]: TraceAbstraction took 2731.61 ms. Allocated memory was 207.6 MB in the beginning and 232.8 MB in the end (delta: 25.2 MB). Free memory was 165.0 MB in the beginning and 144.7 MB in the end (delta: 20.3 MB). Peak memory consumption was 45.5 MB. Max. memory is 7.1 GB. [2020-07-20 17:41:58,947 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 145.8 MB. Free memory was 120.7 MB in the beginning and 120.5 MB in the end (delta: 210.1 kB). Peak memory consumption was 210.1 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 295.58 ms. Allocated memory is still 145.8 MB. Free memory was 101.5 MB in the beginning and 90.7 MB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 219.99 ms. Allocated memory was 145.8 MB in the beginning and 207.6 MB in the end (delta: 61.9 MB). Free memory was 90.7 MB in the beginning and 185.0 MB in the end (delta: -94.3 MB). Peak memory consumption was 9.7 MB. Max. memory is 7.1 GB. * RCFGBuilder took 496.50 ms. Allocated memory is still 207.6 MB. Free memory was 185.0 MB in the beginning and 165.7 MB in the end (delta: 19.3 MB). Peak memory consumption was 19.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2731.61 ms. Allocated memory was 207.6 MB in the beginning and 232.8 MB in the end (delta: 25.2 MB). Free memory was 165.0 MB in the beginning and 144.7 MB in the end (delta: 20.3 MB). Peak memory consumption was 45.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 9]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: overapproximation of shiftLeft at line 58. Possible FailurePath: [L20] char string_A[5], string_B[5]; [L21] int i, j, nc_A, nc_B, found=0; [L24] i=0 VAL [found=0, i=0, string_A={3:0}, string_B={2:0}] [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ VAL [found=0, i=1, string_A={3:0}, string_B={2:0}] [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ VAL [found=0, i=2, string_A={3:0}, string_B={2:0}] [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ VAL [found=0, i=3, string_A={3:0}, string_B={2:0}] [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ VAL [found=0, i=4, string_A={3:0}, string_B={2:0}] [L24] COND TRUE i<5 [L25] string_A[i]=__VERIFIER_nondet_char() [L24] i++ VAL [found=0, i=5, string_A={3:0}, string_B={2:0}] [L24] COND FALSE !(i<5) VAL [found=0, i=5, string_A={3:0}, string_B={2:0}] [L26] EXPR string_A[5 -1] VAL [found=0, i=5, string_A={3:0}, string_A[5 -1]=0, string_B={2:0}] [L26] COND FALSE !(!(string_A[5 -1]=='\0')) [L28] i=0 VAL [found=0, i=0, string_A={3:0}, string_B={2:0}] [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ VAL [found=0, i=1, string_A={3:0}, string_B={2:0}] [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ VAL [found=0, i=2, string_A={3:0}, string_B={2:0}] [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ VAL [found=0, i=3, string_A={3:0}, string_B={2:0}] [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ VAL [found=0, i=4, string_A={3:0}, string_B={2:0}] [L28] COND TRUE i<5 [L29] string_B[i]=__VERIFIER_nondet_char() [L28] i++ VAL [found=0, i=5, string_A={3:0}, string_B={2:0}] [L28] COND FALSE !(i<5) VAL [found=0, i=5, string_A={3:0}, string_B={2:0}] [L30] EXPR string_B[5 -1] VAL [found=0, i=5, string_A={3:0}, string_B={2:0}, string_B[5 -1]=0] [L30] COND FALSE !(!(string_B[5 -1]=='\0')) [L32] nc_A = 0 VAL [found=0, i=5, nc_A=0, string_A={3:0}, string_B={2:0}] [L33] EXPR string_A[nc_A] VAL [found=0, i=5, nc_A=0, string_A={3:0}, string_A[nc_A]=0, string_B={2:0}] [L33] COND FALSE !(string_A[nc_A]!='\0') [L36] nc_B = 0 VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={3:0}, string_B={2:0}] [L37] EXPR string_B[nc_B] VAL [found=0, i=5, nc_A=0, nc_B=0, string_A={3:0}, string_B={2:0}, string_B[nc_B]=0] [L37] COND FALSE !(string_B[nc_B]!='\0') [L40] COND FALSE !(!(nc_B >= nc_A)) [L43] EXPR j=0 [L43] i=j=0 VAL [found=0, i=0, j=0, nc_A=0, nc_B=0, string_A={3:0}, string_B={2:0}] [L44] COND FALSE !((inc_B-1)<