/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/loops/string-2.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-178dd20 [2021-01-06 16:40:20,323 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-01-06 16:40:20,327 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-01-06 16:40:20,391 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-01-06 16:40:20,392 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-01-06 16:40:20,397 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-01-06 16:40:20,401 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-01-06 16:40:20,407 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-01-06 16:40:20,411 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-01-06 16:40:20,420 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-01-06 16:40:20,425 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-01-06 16:40:20,427 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-01-06 16:40:20,427 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-01-06 16:40:20,432 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-01-06 16:40:20,434 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-01-06 16:40:20,436 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-01-06 16:40:20,438 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-01-06 16:40:20,442 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-01-06 16:40:20,451 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-01-06 16:40:20,459 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-01-06 16:40:20,464 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-01-06 16:40:20,466 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-01-06 16:40:20,467 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-01-06 16:40:20,470 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-01-06 16:40:20,480 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-01-06 16:40:20,494 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-01-06 16:40:20,495 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-01-06 16:40:20,496 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-01-06 16:40:20,497 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2021-01-06 16:40:20,573 INFO L113 SettingsManager]: Loading preferences was successful [2021-01-06 16:40:20,573 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-01-06 16:40:20,580 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-01-06 16:40:20,580 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-01-06 16:40:20,580 INFO L138 SettingsManager]: * Use SBE=true [2021-01-06 16:40:20,581 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-01-06 16:40:20,581 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-01-06 16:40:20,581 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-01-06 16:40:20,581 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-01-06 16:40:20,582 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-01-06 16:40:20,583 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-01-06 16:40:20,583 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-01-06 16:40:20,584 INFO L138 SettingsManager]: * Use constant arrays=true [2021-01-06 16:40:20,584 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-01-06 16:40:20,584 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-01-06 16:40:20,585 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-01-06 16:40:20,585 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-01-06 16:40:20,585 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-01-06 16:40:20,585 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-01-06 16:40:20,585 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-01-06 16:40:20,586 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-01-06 16:40:20,586 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-01-06 16:40:20,586 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-01-06 16:40:20,586 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-01-06 16:40:20,587 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-01-06 16:40:20,587 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-01-06 16:40:21,031 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-01-06 16:40:21,065 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-01-06 16:40:21,069 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-01-06 16:40:21,071 INFO L271 PluginConnector]: Initializing CDTParser... [2021-01-06 16:40:21,071 INFO L275 PluginConnector]: CDTParser initialized [2021-01-06 16:40:21,073 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops/string-2.i [2021-01-06 16:40:21,167 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/1abde7f24/5e8525c9d3884ce2876e609963462fca/FLAG31d7c886c [2021-01-06 16:40:21,963 INFO L306 CDTParser]: Found 1 translation units. [2021-01-06 16:40:21,964 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loops/string-2.i [2021-01-06 16:40:21,975 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/1abde7f24/5e8525c9d3884ce2876e609963462fca/FLAG31d7c886c [2021-01-06 16:40:22,274 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/1abde7f24/5e8525c9d3884ce2876e609963462fca [2021-01-06 16:40:22,277 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-01-06 16:40:22,280 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-01-06 16:40:22,282 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-01-06 16:40:22,282 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-01-06 16:40:22,287 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-01-06 16:40:22,288 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 04:40:22" (1/1) ... [2021-01-06 16:40:22,289 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1ce36a19 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:40:22, skipping insertion in model container [2021-01-06 16:40:22,289 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 04:40:22" (1/1) ... [2021-01-06 16:40:22,298 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-01-06 16:40:22,318 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-01-06 16:40:22,491 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loops/string-2.i[896,909] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~string_A~0,],[IdentifierExpression[~i~0,]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~string_B~0,],[IdentifierExpression[~i~0,]]] left hand side expression in assignment: lhs: VariableLHS[~nc_A~0,] left hand side expression in assignment: lhs: VariableLHS[~nc_B~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~found~0,] [2021-01-06 16:40:22,527 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 16:40:22,537 INFO L203 MainTranslator]: Completed pre-run [2021-01-06 16:40:22,554 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loops/string-2.i[896,909] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#string_A~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#string_A~0,],offset],IdentifierExpression[~i~0,]]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#string_B~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#string_B~0,],offset],IdentifierExpression[~i~0,]]]] left hand side expression in assignment: lhs: VariableLHS[~nc_A~0,] left hand side expression in assignment: lhs: VariableLHS[~nc_B~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~found~0,] [2021-01-06 16:40:22,569 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 16:40:22,587 INFO L208 MainTranslator]: Completed translation [2021-01-06 16:40:22,588 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:40:22 WrapperNode [2021-01-06 16:40:22,588 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-01-06 16:40:22,590 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-01-06 16:40:22,590 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-01-06 16:40:22,590 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-01-06 16:40:22,600 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:40:22" (1/1) ... [2021-01-06 16:40:22,610 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:40:22" (1/1) ... [2021-01-06 16:40:22,641 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-01-06 16:40:22,642 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-01-06 16:40:22,643 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-01-06 16:40:22,643 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-01-06 16:40:22,654 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:40:22" (1/1) ... [2021-01-06 16:40:22,654 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:40:22" (1/1) ... [2021-01-06 16:40:22,657 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:40:22" (1/1) ... [2021-01-06 16:40:22,658 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:40:22" (1/1) ... [2021-01-06 16:40:22,666 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:40:22" (1/1) ... [2021-01-06 16:40:22,673 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:40:22" (1/1) ... [2021-01-06 16:40:22,675 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:40:22" (1/1) ... [2021-01-06 16:40:22,678 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-01-06 16:40:22,679 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-01-06 16:40:22,679 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-01-06 16:40:22,680 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-01-06 16:40:22,681 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:40:22" (1/1) ... No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 16:40:22,808 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-01-06 16:40:22,808 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-01-06 16:40:22,808 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-01-06 16:40:22,808 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-01-06 16:40:22,809 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-01-06 16:40:22,809 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-01-06 16:40:22,809 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-01-06 16:40:23,313 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-01-06 16:40:23,314 INFO L299 CfgBuilder]: Removed 11 assume(true) statements. [2021-01-06 16:40:23,316 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 04:40:23 BoogieIcfgContainer [2021-01-06 16:40:23,317 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-01-06 16:40:23,319 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-01-06 16:40:23,319 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-01-06 16:40:23,324 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-01-06 16:40:23,324 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.01 04:40:22" (1/3) ... [2021-01-06 16:40:23,326 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44a2a733 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 04:40:23, skipping insertion in model container [2021-01-06 16:40:23,326 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:40:22" (2/3) ... [2021-01-06 16:40:23,326 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44a2a733 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 04:40:23, skipping insertion in model container [2021-01-06 16:40:23,327 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 04:40:23" (3/3) ... [2021-01-06 16:40:23,329 INFO L111 eAbstractionObserver]: Analyzing ICFG string-2.i [2021-01-06 16:40:23,338 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-01-06 16:40:23,345 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-01-06 16:40:23,370 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-01-06 16:40:23,428 INFO L377 AbstractCegarLoop]: Interprodecural is true [2021-01-06 16:40:23,430 INFO L378 AbstractCegarLoop]: Hoare is true [2021-01-06 16:40:23,430 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-01-06 16:40:23,430 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-01-06 16:40:23,431 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-01-06 16:40:23,431 INFO L382 AbstractCegarLoop]: Difference is false [2021-01-06 16:40:23,431 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-01-06 16:40:23,431 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-01-06 16:40:23,454 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2021-01-06 16:40:23,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-01-06 16:40:23,461 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:40:23,462 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 16:40:23,463 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:40:23,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:40:23,470 INFO L82 PathProgramCache]: Analyzing trace with hash 374782792, now seen corresponding path program 1 times [2021-01-06 16:40:23,479 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:40:23,480 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1532360326] [2021-01-06 16:40:23,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:40:23,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:40:23,647 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 16:40:23,648 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1532360326] [2021-01-06 16:40:23,649 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 16:40:23,650 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-01-06 16:40:23,651 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1752876205] [2021-01-06 16:40:23,656 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2021-01-06 16:40:23,657 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:40:23,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-01-06 16:40:23,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-01-06 16:40:23,677 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 2 states. [2021-01-06 16:40:23,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:40:23,702 INFO L93 Difference]: Finished difference Result 48 states and 74 transitions. [2021-01-06 16:40:23,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-01-06 16:40:23,704 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 16 [2021-01-06 16:40:23,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:40:23,715 INFO L225 Difference]: With dead ends: 48 [2021-01-06 16:40:23,715 INFO L226 Difference]: Without dead ends: 22 [2021-01-06 16:40:23,720 INFO L677 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 [2021-01-06 16:40:23,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-01-06 16:40:23,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-01-06 16:40:23,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2021-01-06 16:40:23,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2021-01-06 16:40:23,765 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 16 [2021-01-06 16:40:23,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:40:23,765 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2021-01-06 16:40:23,766 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2021-01-06 16:40:23,766 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2021-01-06 16:40:23,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-01-06 16:40:23,767 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:40:23,767 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 16:40:23,768 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-01-06 16:40:23,768 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:40:23,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:40:23,769 INFO L82 PathProgramCache]: Analyzing trace with hash 1602331574, now seen corresponding path program 1 times [2021-01-06 16:40:23,770 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:40:23,770 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1582823882] [2021-01-06 16:40:23,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:40:23,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:40:23,839 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 16:40:23,840 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1582823882] [2021-01-06 16:40:23,840 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 16:40:23,840 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-01-06 16:40:23,841 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126239358] [2021-01-06 16:40:23,842 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-01-06 16:40:23,843 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:40:23,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-01-06 16:40:23,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-01-06 16:40:23,845 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand 3 states. [2021-01-06 16:40:23,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:40:23,939 INFO L93 Difference]: Finished difference Result 50 states and 62 transitions. [2021-01-06 16:40:23,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-01-06 16:40:23,943 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2021-01-06 16:40:23,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:40:23,945 INFO L225 Difference]: With dead ends: 50 [2021-01-06 16:40:23,946 INFO L226 Difference]: Without dead ends: 32 [2021-01-06 16:40:23,948 INFO L677 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 [2021-01-06 16:40:23,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-01-06 16:40:23,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 24. [2021-01-06 16:40:23,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2021-01-06 16:40:23,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2021-01-06 16:40:23,962 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 18 [2021-01-06 16:40:23,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:40:23,963 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2021-01-06 16:40:23,963 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-01-06 16:40:23,963 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2021-01-06 16:40:23,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-01-06 16:40:23,964 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:40:23,965 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] [2021-01-06 16:40:23,966 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-01-06 16:40:23,966 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:40:23,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:40:23,969 INFO L82 PathProgramCache]: Analyzing trace with hash 177830358, now seen corresponding path program 1 times [2021-01-06 16:40:23,969 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:40:23,969 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2141200380] [2021-01-06 16:40:23,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:40:23,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:40:24,022 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 16:40:24,023 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2141200380] [2021-01-06 16:40:24,023 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1126927446] [2021-01-06 16:40:24,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 16:40:24,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:40:24,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core [2021-01-06 16:40:24,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:40:24,177 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 16:40:24,178 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:40:24,178 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-01-06 16:40:24,179 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [113617894] [2021-01-06 16:40:24,179 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-01-06 16:40:24,180 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:40:24,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-01-06 16:40:24,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-01-06 16:40:24,181 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand 5 states. [2021-01-06 16:40:24,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:40:24,247 INFO L93 Difference]: Finished difference Result 61 states and 74 transitions. [2021-01-06 16:40:24,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-01-06 16:40:24,248 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 22 [2021-01-06 16:40:24,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:40:24,249 INFO L225 Difference]: With dead ends: 61 [2021-01-06 16:40:24,249 INFO L226 Difference]: Without dead ends: 42 [2021-01-06 16:40:24,250 INFO L677 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 [2021-01-06 16:40:24,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-01-06 16:40:24,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 28. [2021-01-06 16:40:24,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2021-01-06 16:40:24,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2021-01-06 16:40:24,257 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 22 [2021-01-06 16:40:24,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:40:24,257 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2021-01-06 16:40:24,257 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2021-01-06 16:40:24,257 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2021-01-06 16:40:24,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-01-06 16:40:24,258 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:40:24,258 INFO L422 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] [2021-01-06 16:40:24,473 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-01-06 16:40:24,474 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:40:24,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:40:24,476 INFO L82 PathProgramCache]: Analyzing trace with hash 1590720246, now seen corresponding path program 2 times [2021-01-06 16:40:24,476 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:40:24,477 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [384708592] [2021-01-06 16:40:24,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:40:24,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:40:24,607 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-01-06 16:40:24,607 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [384708592] [2021-01-06 16:40:24,608 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1968122832] [2021-01-06 16:40:24,608 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 16:40:24,689 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 16:40:24,689 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:40:24,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 4 conjunts are in the unsatisfiable core [2021-01-06 16:40:24,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:40:24,738 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-01-06 16:40:24,738 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:40:24,739 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-01-06 16:40:24,739 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275655839] [2021-01-06 16:40:24,740 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-01-06 16:40:24,740 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:40:24,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-01-06 16:40:24,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-01-06 16:40:24,742 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand 6 states. [2021-01-06 16:40:24,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:40:24,825 INFO L93 Difference]: Finished difference Result 73 states and 87 transitions. [2021-01-06 16:40:24,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-01-06 16:40:24,826 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 26 [2021-01-06 16:40:24,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:40:24,827 INFO L225 Difference]: With dead ends: 73 [2021-01-06 16:40:24,827 INFO L226 Difference]: Without dead ends: 52 [2021-01-06 16:40:24,828 INFO L677 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 [2021-01-06 16:40:24,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-01-06 16:40:24,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 32. [2021-01-06 16:40:24,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2021-01-06 16:40:24,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 37 transitions. [2021-01-06 16:40:24,836 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 37 transitions. Word has length 26 [2021-01-06 16:40:24,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:40:24,837 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 37 transitions. [2021-01-06 16:40:24,837 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-01-06 16:40:24,837 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 37 transitions. [2021-01-06 16:40:24,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-01-06 16:40:24,838 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:40:24,838 INFO L422 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] [2021-01-06 16:40:25,052 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:40:25,053 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:40:25,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:40:25,055 INFO L82 PathProgramCache]: Analyzing trace with hash -381068522, now seen corresponding path program 3 times [2021-01-06 16:40:25,055 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:40:25,056 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [595732503] [2021-01-06 16:40:25,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:40:25,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:40:25,238 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-01-06 16:40:25,239 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [595732503] [2021-01-06 16:40:25,239 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1861375680] [2021-01-06 16:40:25,239 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 16:40:25,319 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-01-06 16:40:25,319 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:40:25,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 5 conjunts are in the unsatisfiable core [2021-01-06 16:40:25,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:40:25,386 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-01-06 16:40:25,386 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:40:25,386 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2021-01-06 16:40:25,387 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [417077793] [2021-01-06 16:40:25,387 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-01-06 16:40:25,387 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:40:25,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-01-06 16:40:25,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-01-06 16:40:25,389 INFO L87 Difference]: Start difference. First operand 32 states and 37 transitions. Second operand 7 states. [2021-01-06 16:40:25,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:40:25,472 INFO L93 Difference]: Finished difference Result 85 states and 100 transitions. [2021-01-06 16:40:25,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-01-06 16:40:25,473 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 30 [2021-01-06 16:40:25,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:40:25,474 INFO L225 Difference]: With dead ends: 85 [2021-01-06 16:40:25,474 INFO L226 Difference]: Without dead ends: 62 [2021-01-06 16:40:25,475 INFO L677 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 [2021-01-06 16:40:25,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-01-06 16:40:25,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 36. [2021-01-06 16:40:25,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2021-01-06 16:40:25,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2021-01-06 16:40:25,482 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 30 [2021-01-06 16:40:25,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:40:25,483 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2021-01-06 16:40:25,483 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2021-01-06 16:40:25,483 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2021-01-06 16:40:25,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-01-06 16:40:25,487 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:40:25,487 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] [2021-01-06 16:40:25,697 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:40:25,698 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:40:25,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:40:25,700 INFO L82 PathProgramCache]: Analyzing trace with hash -583604682, now seen corresponding path program 4 times [2021-01-06 16:40:25,700 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:40:25,700 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1907364851] [2021-01-06 16:40:25,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:40:25,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:40:25,780 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-01-06 16:40:25,781 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1907364851] [2021-01-06 16:40:25,782 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1326969302] [2021-01-06 16:40:25,782 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 16:40:25,839 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 16:40:25,839 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 16:40:25,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 6 conjunts are in the unsatisfiable core [2021-01-06 16:40:25,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 16:40:25,929 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-01-06 16:40:25,933 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 16:40:25,933 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2021-01-06 16:40:25,934 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86501599] [2021-01-06 16:40:25,934 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-01-06 16:40:25,935 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:40:25,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-01-06 16:40:25,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2021-01-06 16:40:25,939 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand 8 states. [2021-01-06 16:40:26,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:40:26,053 INFO L93 Difference]: Finished difference Result 95 states and 111 transitions. [2021-01-06 16:40:26,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-01-06 16:40:26,054 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 34 [2021-01-06 16:40:26,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:40:26,055 INFO L225 Difference]: With dead ends: 95 [2021-01-06 16:40:26,055 INFO L226 Difference]: Without dead ends: 70 [2021-01-06 16:40:26,056 INFO L677 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 [2021-01-06 16:40:26,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-01-06 16:40:26,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 40. [2021-01-06 16:40:26,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2021-01-06 16:40:26,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 45 transitions. [2021-01-06 16:40:26,062 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 45 transitions. Word has length 34 [2021-01-06 16:40:26,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:40:26,062 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 45 transitions. [2021-01-06 16:40:26,063 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2021-01-06 16:40:26,063 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 45 transitions. [2021-01-06 16:40:26,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-01-06 16:40:26,064 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:40:26,064 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] [2021-01-06 16:40:26,277 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 16:40:26,278 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:40:26,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:40:26,279 INFO L82 PathProgramCache]: Analyzing trace with hash -270804906, now seen corresponding path program 5 times [2021-01-06 16:40:26,279 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:40:26,280 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [921865408] [2021-01-06 16:40:26,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:40:26,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-01-06 16:40:26,370 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-01-06 16:40:26,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-01-06 16:40:26,450 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-01-06 16:40:26,498 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-01-06 16:40:26,498 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2021-01-06 16:40:26,499 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-01-06 16:40:26,584 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.01 04:40:26 BoogieIcfgContainer [2021-01-06 16:40:26,584 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-01-06 16:40:26,585 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-01-06 16:40:26,585 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-01-06 16:40:26,585 INFO L275 PluginConnector]: Witness Printer initialized [2021-01-06 16:40:26,586 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 04:40:23" (3/4) ... [2021-01-06 16:40:26,590 INFO L140 WitnessPrinter]: No result that supports witness generation found [2021-01-06 16:40:26,590 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-01-06 16:40:26,600 INFO L168 Benchmark]: Toolchain (without parser) took 4311.97 ms. Allocated memory is still 162.5 MB. Free memory was 138.5 MB in the beginning and 66.4 MB in the end (delta: 72.1 MB). Peak memory consumption was 72.9 MB. Max. memory is 8.0 GB. [2021-01-06 16:40:26,602 INFO L168 Benchmark]: CDTParser took 0.28 ms. Allocated memory is still 162.5 MB. Free memory is still 137.6 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-01-06 16:40:26,603 INFO L168 Benchmark]: CACSL2BoogieTranslator took 306.79 ms. Allocated memory is still 162.5 MB. Free memory was 138.3 MB in the beginning and 128.0 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. [2021-01-06 16:40:26,604 INFO L168 Benchmark]: Boogie Procedure Inliner took 51.88 ms. Allocated memory is still 162.5 MB. Free memory was 127.8 MB in the beginning and 126.2 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-01-06 16:40:26,605 INFO L168 Benchmark]: Boogie Preprocessor took 35.89 ms. Allocated memory is still 162.5 MB. Free memory was 126.2 MB in the beginning and 125.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-01-06 16:40:26,606 INFO L168 Benchmark]: RCFGBuilder took 637.63 ms. Allocated memory is still 162.5 MB. Free memory was 124.8 MB in the beginning and 140.6 MB in the end (delta: -15.9 MB). Peak memory consumption was 15.9 MB. Max. memory is 8.0 GB. [2021-01-06 16:40:26,610 INFO L168 Benchmark]: TraceAbstraction took 3265.59 ms. Allocated memory is still 162.5 MB. Free memory was 140.1 MB in the beginning and 66.9 MB in the end (delta: 73.2 MB). Peak memory consumption was 73.7 MB. Max. memory is 8.0 GB. [2021-01-06 16:40:26,612 INFO L168 Benchmark]: Witness Printer took 5.66 ms. Allocated memory is still 162.5 MB. Free memory was 66.9 MB in the beginning and 66.4 MB in the end (delta: 522.2 kB). There was no memory consumed. Max. memory is 8.0 GB. [2021-01-06 16:40:26,624 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28 ms. Allocated memory is still 162.5 MB. Free memory is still 137.6 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 306.79 ms. Allocated memory is still 162.5 MB. Free memory was 138.3 MB in the beginning and 128.0 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 51.88 ms. Allocated memory is still 162.5 MB. Free memory was 127.8 MB in the beginning and 126.2 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 35.89 ms. Allocated memory is still 162.5 MB. Free memory was 126.2 MB in the beginning and 125.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 637.63 ms. Allocated memory is still 162.5 MB. Free memory was 124.8 MB in the beginning and 140.6 MB in the end (delta: -15.9 MB). Peak memory consumption was 15.9 MB. Max. memory is 8.0 GB. * TraceAbstraction took 3265.59 ms. Allocated memory is still 162.5 MB. Free memory was 140.1 MB in the beginning and 66.9 MB in the end (delta: 73.2 MB). Peak memory consumption was 73.7 MB. Max. memory is 8.0 GB. * Witness Printer took 5.66 ms. Allocated memory is still 162.5 MB. Free memory was 66.9 MB in the beginning and 66.4 MB in the end (delta: 522.2 kB). There was no memory consumed. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 20]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: overapproximation of shiftLeft at line 69. Possible FailurePath: [L31] char string_A[5], string_B[5]; [L32] int i, j, nc_A, nc_B, found=0; [L35] i=0 [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND TRUE i<5 [L36] string_A[i]=__VERIFIER_nondet_char() [L35] i++ [L35] COND FALSE !(i<5) [L37] EXPR string_A[5 -1] [L37] COND FALSE !(!(string_A[5 -1]=='\0')) [L39] i=0 [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND TRUE i<5 [L40] string_B[i]=__VERIFIER_nondet_char() [L39] i++ [L39] COND FALSE !(i<5) [L41] EXPR string_B[5 -1] [L41] COND FALSE !(!(string_B[5 -1]=='\0')) [L43] nc_A = 0 [L44] EXPR string_A[nc_A] [L44] COND FALSE !(string_A[nc_A]!='\0') [L47] nc_B = 0 [L48] EXPR string_B[nc_B] [L48] COND FALSE !(string_B[nc_B]!='\0') [L51] COND FALSE !(!(nc_B >= nc_A)) [L54] EXPR j=0 [L54] i=j=0 [L55] COND FALSE !((inc_B-1)<