/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/invert_string-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-dcfa08f [2020-12-23 06:44:27,474 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-23 06:44:27,478 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-23 06:44:27,520 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-23 06:44:27,521 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-23 06:44:27,523 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-23 06:44:27,525 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-23 06:44:27,528 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-23 06:44:27,531 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-23 06:44:27,532 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-23 06:44:27,534 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-23 06:44:27,536 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-23 06:44:27,536 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-23 06:44:27,538 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-23 06:44:27,539 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-23 06:44:27,541 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-23 06:44:27,542 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-23 06:44:27,544 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-23 06:44:27,546 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-23 06:44:27,549 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-23 06:44:27,552 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-23 06:44:27,554 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-23 06:44:27,556 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-23 06:44:27,569 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-23 06:44:27,573 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-23 06:44:27,590 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-23 06:44:27,592 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-23 06:44:27,598 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-23 06:44:27,602 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-23 06:44:27,637 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-23 06:44:27,637 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-23 06:44:27,639 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-23 06:44:27,639 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-23 06:44:27,640 INFO L138 SettingsManager]: * Use SBE=true [2020-12-23 06:44:27,640 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-23 06:44:27,640 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-23 06:44:27,641 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-23 06:44:27,641 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-23 06:44:27,641 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-23 06:44:27,642 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-23 06:44:27,642 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-23 06:44:27,642 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-23 06:44:27,642 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-23 06:44:27,643 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-23 06:44:27,643 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-23 06:44:27,643 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-23 06:44:27,644 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-23 06:44:27,644 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-23 06:44:27,644 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-23 06:44:27,645 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-23 06:44:27,645 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-23 06:44:27,645 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-23 06:44:27,645 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-23 06:44:27,646 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-23 06:44:27,646 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-23 06:44:28,089 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-23 06:44:28,122 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-23 06:44:28,126 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-23 06:44:28,128 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-23 06:44:28,129 INFO L275 PluginConnector]: CDTParser initialized [2020-12-23 06:44:28,130 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops/invert_string-1.c [2020-12-23 06:44:28,219 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/dd704b281/186cae16a7ed4e13a197d30b66ad374a/FLAGc6ce1127f [2020-12-23 06:44:28,942 INFO L306 CDTParser]: Found 1 translation units. [2020-12-23 06:44:28,943 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loops/invert_string-1.c [2020-12-23 06:44:28,952 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/dd704b281/186cae16a7ed4e13a197d30b66ad374a/FLAGc6ce1127f [2020-12-23 06:44:29,291 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/dd704b281/186cae16a7ed4e13a197d30b66ad374a [2020-12-23 06:44:29,297 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-23 06:44:29,303 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-23 06:44:29,308 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-23 06:44:29,308 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-23 06:44:29,313 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-23 06:44:29,315 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 06:44:29" (1/1) ... [2020-12-23 06:44:29,318 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2940286a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:44:29, skipping insertion in model container [2020-12-23 06:44:29,318 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 06:44:29" (1/1) ... [2020-12-23 06:44:29,329 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-23 06:44:29,349 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-23 06:44:29,591 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/invert_string-1.c[352,365] left hand side expression in assignment: lhs: VariableLHS[~cont~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~str1~0,],[IdentifierExpression[~i~0,]]] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~str1~0,],[BinaryExpression[ARITHMINUS,IdentifierExpression[~MAX~0,],IntegerLiteral[1]]]] 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: ArrayLHS[VariableLHS[~str2~0,],[IdentifierExpression[~j~0,]]] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] [2020-12-23 06:44:29,624 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 06:44:29,636 INFO L203 MainTranslator]: Completed pre-run [2020-12-23 06:44:29,653 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/invert_string-1.c[352,365] left hand side expression in assignment: lhs: VariableLHS[~cont~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#str1~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#str1~0,],offset],IdentifierExpression[~i~0,]]]] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#str1~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#str1~0,],offset],BinaryExpression[ARITHMINUS,IdentifierExpression[~MAX~0,],IntegerLiteral[1]]]]] 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: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#str2~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#str2~0,],offset],IdentifierExpression[~j~0,]]]] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] [2020-12-23 06:44:29,665 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 06:44:29,689 INFO L208 MainTranslator]: Completed translation [2020-12-23 06:44:29,690 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:44:29 WrapperNode [2020-12-23 06:44:29,691 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-23 06:44:29,692 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-23 06:44:29,693 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-23 06:44:29,693 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-23 06:44:29,705 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:44:29" (1/1) ... [2020-12-23 06:44:29,716 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:44:29" (1/1) ... [2020-12-23 06:44:29,744 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-23 06:44:29,745 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-23 06:44:29,745 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-23 06:44:29,746 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-23 06:44:29,758 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:44:29" (1/1) ... [2020-12-23 06:44:29,758 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:44:29" (1/1) ... [2020-12-23 06:44:29,761 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:44:29" (1/1) ... [2020-12-23 06:44:29,761 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:44:29" (1/1) ... [2020-12-23 06:44:29,768 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:44:29" (1/1) ... [2020-12-23 06:44:29,774 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:44:29" (1/1) ... [2020-12-23 06:44:29,776 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:44:29" (1/1) ... [2020-12-23 06:44:29,779 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-23 06:44:29,780 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-23 06:44:29,781 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-23 06:44:29,781 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-23 06:44:29,782 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:44:29" (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 [2020-12-23 06:44:29,916 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-23 06:44:29,916 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-23 06:44:29,916 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-23 06:44:29,917 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-23 06:44:29,917 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-23 06:44:29,917 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-23 06:44:29,917 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-23 06:44:30,292 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-23 06:44:30,292 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2020-12-23 06:44:30,295 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 06:44:30 BoogieIcfgContainer [2020-12-23 06:44:30,295 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-23 06:44:30,299 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-23 06:44:30,299 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-23 06:44:30,304 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-23 06:44:30,304 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.12 06:44:29" (1/3) ... [2020-12-23 06:44:30,306 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e162a59 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 06:44:30, skipping insertion in model container [2020-12-23 06:44:30,306 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:44:29" (2/3) ... [2020-12-23 06:44:30,307 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e162a59 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 06:44:30, skipping insertion in model container [2020-12-23 06:44:30,307 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 06:44:30" (3/3) ... [2020-12-23 06:44:30,309 INFO L111 eAbstractionObserver]: Analyzing ICFG invert_string-1.c [2020-12-23 06:44:30,319 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-23 06:44:30,325 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-23 06:44:30,354 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-23 06:44:30,416 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-23 06:44:30,416 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-23 06:44:30,417 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-23 06:44:30,417 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-23 06:44:30,417 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-23 06:44:30,417 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-23 06:44:30,417 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-23 06:44:30,418 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-23 06:44:30,437 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-12-23 06:44:30,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-23 06:44:30,444 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:44:30,445 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:44:30,446 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:44:30,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:44:30,454 INFO L82 PathProgramCache]: Analyzing trace with hash -56209308, now seen corresponding path program 1 times [2020-12-23 06:44:30,468 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:44:30,469 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1141647267] [2020-12-23 06:44:30,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:44:30,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:44:30,671 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:44:30,673 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1141647267] [2020-12-23 06:44:30,674 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 06:44:30,674 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-23 06:44:30,676 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483296983] [2020-12-23 06:44:30,682 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-12-23 06:44:30,682 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:44:30,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-12-23 06:44:30,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-23 06:44:30,707 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2020-12-23 06:44:30,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:44:30,730 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2020-12-23 06:44:30,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-12-23 06:44:30,732 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 11 [2020-12-23 06:44:30,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:44:30,743 INFO L225 Difference]: With dead ends: 37 [2020-12-23 06:44:30,744 INFO L226 Difference]: Without dead ends: 16 [2020-12-23 06:44:30,748 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 [2020-12-23 06:44:30,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-12-23 06:44:30,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-12-23 06:44:30,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-12-23 06:44:30,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-12-23 06:44:30,796 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 11 [2020-12-23 06:44:30,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:44:30,797 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-12-23 06:44:30,797 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-12-23 06:44:30,797 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-12-23 06:44:30,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-23 06:44:30,798 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:44:30,798 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:44:30,799 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-23 06:44:30,799 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:44:30,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:44:30,800 INFO L82 PathProgramCache]: Analyzing trace with hash -411746854, now seen corresponding path program 1 times [2020-12-23 06:44:30,801 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:44:30,801 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1453838347] [2020-12-23 06:44:30,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:44:30,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:44:30,933 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:44:30,934 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1453838347] [2020-12-23 06:44:30,934 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 06:44:30,934 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-12-23 06:44:30,935 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352664345] [2020-12-23 06:44:30,937 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-23 06:44:30,937 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:44:30,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-23 06:44:30,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-12-23 06:44:30,940 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 4 states. [2020-12-23 06:44:31,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:44:31,043 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2020-12-23 06:44:31,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-23 06:44:31,044 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-12-23 06:44:31,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:44:31,046 INFO L225 Difference]: With dead ends: 34 [2020-12-23 06:44:31,046 INFO L226 Difference]: Without dead ends: 24 [2020-12-23 06:44:31,047 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-12-23 06:44:31,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-12-23 06:44:31,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 17. [2020-12-23 06:44:31,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-12-23 06:44:31,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-12-23 06:44:31,056 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 11 [2020-12-23 06:44:31,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:44:31,056 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-12-23 06:44:31,056 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-23 06:44:31,057 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-12-23 06:44:31,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-12-23 06:44:31,057 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:44:31,058 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:44:31,058 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-23 06:44:31,058 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:44:31,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:44:31,060 INFO L82 PathProgramCache]: Analyzing trace with hash 1790951096, now seen corresponding path program 1 times [2020-12-23 06:44:31,060 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:44:31,060 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1306995809] [2020-12-23 06:44:31,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:44:31,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:44:31,142 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-23 06:44:31,146 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1306995809] [2020-12-23 06:44:31,147 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 06:44:31,171 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-12-23 06:44:31,172 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542797476] [2020-12-23 06:44:31,177 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-23 06:44:31,177 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:44:31,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-23 06:44:31,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-12-23 06:44:31,179 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 4 states. [2020-12-23 06:44:31,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:44:31,344 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2020-12-23 06:44:31,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-23 06:44:31,345 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2020-12-23 06:44:31,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:44:31,347 INFO L225 Difference]: With dead ends: 25 [2020-12-23 06:44:31,348 INFO L226 Difference]: Without dead ends: 18 [2020-12-23 06:44:31,353 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-12-23 06:44:31,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-12-23 06:44:31,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-12-23 06:44:31,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-12-23 06:44:31,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-12-23 06:44:31,374 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2020-12-23 06:44:31,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:44:31,374 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-12-23 06:44:31,375 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-23 06:44:31,375 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-12-23 06:44:31,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-12-23 06:44:31,377 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:44:31,378 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:44:31,378 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-12-23 06:44:31,378 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:44:31,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:44:31,381 INFO L82 PathProgramCache]: Analyzing trace with hash 467501014, now seen corresponding path program 1 times [2020-12-23 06:44:31,383 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:44:31,383 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [329230564] [2020-12-23 06:44:31,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:44:31,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:44:32,017 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:44:32,018 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [329230564] [2020-12-23 06:44:32,019 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [620480316] [2020-12-23 06:44:32,019 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 [2020-12-23 06:44:32,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:44:32,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 28 conjunts are in the unsatisfiable core [2020-12-23 06:44:32,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:44:32,273 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2020-12-23 06:44:32,275 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 06:44:32,287 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 06:44:32,289 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 06:44:32,290 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:26 [2020-12-23 06:44:32,346 INFO L173 IndexEqualityManager]: detected equality via solver [2020-12-23 06:44:32,375 INFO L348 Elim1Store]: treesize reduction 35, result has 37.5 percent of original size [2020-12-23 06:44:32,375 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 26 treesize of output 31 [2020-12-23 06:44:32,378 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 06:44:32,410 INFO L625 ElimStorePlain]: treesize reduction 14, result has 72.5 percent of original size [2020-12-23 06:44:32,412 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 06:44:32,413 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:38, output treesize:37 [2020-12-23 06:44:32,574 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-23 06:44:32,582 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-23 06:44:32,586 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-23 06:44:32,593 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 5 disjuncts [2020-12-23 06:44:32,617 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:44:32,618 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:44:32,618 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 17 [2020-12-23 06:44:32,619 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529078138] [2020-12-23 06:44:32,619 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-23 06:44:32,619 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:44:32,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-23 06:44:32,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2020-12-23 06:44:32,622 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 17 states. [2020-12-23 06:44:33,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:44:33,367 INFO L93 Difference]: Finished difference Result 39 states and 44 transitions. [2020-12-23 06:44:33,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-23 06:44:33,368 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 15 [2020-12-23 06:44:33,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:44:33,369 INFO L225 Difference]: With dead ends: 39 [2020-12-23 06:44:33,369 INFO L226 Difference]: Without dead ends: 22 [2020-12-23 06:44:33,370 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=166, Invalid=536, Unknown=0, NotChecked=0, Total=702 [2020-12-23 06:44:33,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-12-23 06:44:33,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 20. [2020-12-23 06:44:33,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-23 06:44:33,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-12-23 06:44:33,376 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 15 [2020-12-23 06:44:33,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:44:33,376 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-12-23 06:44:33,376 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-23 06:44:33,376 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-12-23 06:44:33,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-23 06:44:33,377 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:44:33,377 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:44:33,592 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:44:33,593 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:44:33,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:44:33,594 INFO L82 PathProgramCache]: Analyzing trace with hash 35676596, now seen corresponding path program 2 times [2020-12-23 06:44:33,595 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:44:33,595 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1360374849] [2020-12-23 06:44:33,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:44:33,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:44:33,670 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:44:33,671 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1360374849] [2020-12-23 06:44:33,671 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1294549870] [2020-12-23 06:44:33,671 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 [2020-12-23 06:44:33,737 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 06:44:33,738 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:44:33,739 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-23 06:44:33,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:44:33,782 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:44:33,782 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:44:33,782 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 6 [2020-12-23 06:44:33,783 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188805065] [2020-12-23 06:44:33,783 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-23 06:44:33,783 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:44:33,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-23 06:44:33,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-12-23 06:44:33,784 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2020-12-23 06:44:33,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:44:33,869 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2020-12-23 06:44:33,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-23 06:44:33,869 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2020-12-23 06:44:33,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:44:33,870 INFO L225 Difference]: With dead ends: 35 [2020-12-23 06:44:33,870 INFO L226 Difference]: Without dead ends: 28 [2020-12-23 06:44:33,871 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-12-23 06:44:33,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-12-23 06:44:33,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 22. [2020-12-23 06:44:33,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-12-23 06:44:33,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-12-23 06:44:33,876 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 17 [2020-12-23 06:44:33,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:44:33,877 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-12-23 06:44:33,877 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-23 06:44:33,877 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-12-23 06:44:33,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-12-23 06:44:33,878 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:44:33,878 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:44:34,091 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:44:34,092 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:44:34,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:44:34,095 INFO L82 PathProgramCache]: Analyzing trace with hash 1570853842, now seen corresponding path program 3 times [2020-12-23 06:44:34,096 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:44:34,096 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [449501609] [2020-12-23 06:44:34,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:44:34,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:44:34,559 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:44:34,559 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [449501609] [2020-12-23 06:44:34,560 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [168794390] [2020-12-23 06:44:34,560 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 [2020-12-23 06:44:34,621 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-23 06:44:34,621 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:44:34,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 32 conjunts are in the unsatisfiable core [2020-12-23 06:44:34,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:44:34,640 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2020-12-23 06:44:34,643 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 06:44:34,651 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 06:44:34,652 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-12-23 06:44:34,652 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:18, output treesize:14 [2020-12-23 06:44:34,792 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2020-12-23 06:44:34,794 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 06:44:34,810 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 06:44:34,814 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2020-12-23 06:44:34,815 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:44, output treesize:40 [2020-12-23 06:44:34,973 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-23 06:44:34,977 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-23 06:44:34,979 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-23 06:44:34,985 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-23 06:44:34,987 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 7 disjuncts [2020-12-23 06:44:35,018 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:44:35,019 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:44:35,019 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 17 [2020-12-23 06:44:35,020 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428117120] [2020-12-23 06:44:35,020 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-23 06:44:35,020 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:44:35,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-23 06:44:35,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=229, Unknown=0, NotChecked=0, Total=272 [2020-12-23 06:44:35,022 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 17 states. [2020-12-23 06:44:36,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:44:36,126 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2020-12-23 06:44:36,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-12-23 06:44:36,128 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 19 [2020-12-23 06:44:36,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:44:36,129 INFO L225 Difference]: With dead ends: 51 [2020-12-23 06:44:36,129 INFO L226 Difference]: Without dead ends: 42 [2020-12-23 06:44:36,130 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=195, Invalid=735, Unknown=0, NotChecked=0, Total=930 [2020-12-23 06:44:36,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-12-23 06:44:36,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 37. [2020-12-23 06:44:36,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-12-23 06:44:36,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-12-23 06:44:36,151 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 19 [2020-12-23 06:44:36,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:44:36,151 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-12-23 06:44:36,151 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-23 06:44:36,151 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-12-23 06:44:36,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-12-23 06:44:36,155 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:44:36,155 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:44:36,368 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:44:36,369 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:44:36,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:44:36,370 INFO L82 PathProgramCache]: Analyzing trace with hash -1044113744, now seen corresponding path program 4 times [2020-12-23 06:44:36,371 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:44:36,371 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [965802796] [2020-12-23 06:44:36,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:44:36,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:44:36,495 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:44:36,496 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [965802796] [2020-12-23 06:44:36,496 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [458047366] [2020-12-23 06:44:36,496 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 [2020-12-23 06:44:36,551 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 06:44:36,552 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:44:36,553 WARN L261 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 31 conjunts are in the unsatisfiable core [2020-12-23 06:44:36,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:44:36,567 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2020-12-23 06:44:36,569 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 06:44:36,575 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 06:44:36,576 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-12-23 06:44:36,576 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:15, output treesize:11 [2020-12-23 06:44:36,692 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2020-12-23 06:44:36,694 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 06:44:36,706 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 06:44:36,707 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 06:44:36,708 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:36, output treesize:32 [2020-12-23 06:44:36,857 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-23 06:44:36,860 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-23 06:44:36,862 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-23 06:44:36,867 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-23 06:44:36,870 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 5 disjuncts [2020-12-23 06:44:36,894 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-12-23 06:44:36,895 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:44:36,895 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 11] total 16 [2020-12-23 06:44:36,896 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851879534] [2020-12-23 06:44:36,896 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-23 06:44:36,896 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:44:36,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-23 06:44:36,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2020-12-23 06:44:36,897 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 16 states. [2020-12-23 06:44:38,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:44:38,133 INFO L93 Difference]: Finished difference Result 73 states and 77 transitions. [2020-12-23 06:44:38,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-12-23 06:44:38,134 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 21 [2020-12-23 06:44:38,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:44:38,135 INFO L225 Difference]: With dead ends: 73 [2020-12-23 06:44:38,135 INFO L226 Difference]: Without dead ends: 66 [2020-12-23 06:44:38,137 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 274 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=269, Invalid=1137, Unknown=0, NotChecked=0, Total=1406 [2020-12-23 06:44:38,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-12-23 06:44:38,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 39. [2020-12-23 06:44:38,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-12-23 06:44:38,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-12-23 06:44:38,148 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 21 [2020-12-23 06:44:38,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:44:38,149 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-12-23 06:44:38,149 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-23 06:44:38,149 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-12-23 06:44:38,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-12-23 06:44:38,150 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:44:38,150 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:44:38,365 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:44:38,366 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:44:38,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:44:38,367 INFO L82 PathProgramCache]: Analyzing trace with hash -1020544562, now seen corresponding path program 5 times [2020-12-23 06:44:38,368 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:44:38,368 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [174674548] [2020-12-23 06:44:38,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:44:38,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:44:38,859 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:44:38,860 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [174674548] [2020-12-23 06:44:38,860 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1460536608] [2020-12-23 06:44:38,860 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:44:38,923 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2020-12-23 06:44:38,923 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 06:44:38,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 35 conjunts are in the unsatisfiable core [2020-12-23 06:44:38,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:44:38,939 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2020-12-23 06:44:38,942 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 06:44:38,950 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 06:44:38,951 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2020-12-23 06:44:38,952 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:18, output treesize:14 [2020-12-23 06:44:39,109 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2020-12-23 06:44:39,111 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 06:44:39,128 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 06:44:39,131 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2020-12-23 06:44:39,132 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:42, output treesize:38 [2020-12-23 06:44:39,278 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-23 06:44:39,282 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-12-23 06:44:39,284 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-23 06:44:39,289 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-12-23 06:44:39,291 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 7 disjuncts [2020-12-23 06:44:39,323 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:44:39,324 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:44:39,324 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 18 [2020-12-23 06:44:39,325 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [142288547] [2020-12-23 06:44:39,325 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-23 06:44:39,325 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:44:39,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-23 06:44:39,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=261, Unknown=0, NotChecked=0, Total=306 [2020-12-23 06:44:39,327 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 18 states. [2020-12-23 06:44:41,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:44:41,001 INFO L93 Difference]: Finished difference Result 77 states and 83 transitions. [2020-12-23 06:44:41,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-12-23 06:44:41,002 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 23 [2020-12-23 06:44:41,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:44:41,004 INFO L225 Difference]: With dead ends: 77 [2020-12-23 06:44:41,004 INFO L226 Difference]: Without dead ends: 75 [2020-12-23 06:44:41,005 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 16 SyntacticMatches, 4 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 242 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=284, Invalid=1122, Unknown=0, NotChecked=0, Total=1406 [2020-12-23 06:44:41,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-12-23 06:44:41,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 52. [2020-12-23 06:44:41,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-12-23 06:44:41,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 58 transitions. [2020-12-23 06:44:41,019 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 58 transitions. Word has length 23 [2020-12-23 06:44:41,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:44:41,019 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 58 transitions. [2020-12-23 06:44:41,019 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-23 06:44:41,019 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 58 transitions. [2020-12-23 06:44:41,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-12-23 06:44:41,020 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:44:41,020 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:44:41,234 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:44:41,235 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:44:41,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:44:41,236 INFO L82 PathProgramCache]: Analyzing trace with hash 1262940008, now seen corresponding path program 1 times [2020-12-23 06:44:41,236 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:44:41,236 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [315979279] [2020-12-23 06:44:41,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:44:41,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-23 06:44:41,288 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-23 06:44:41,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-23 06:44:41,371 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-23 06:44:41,406 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-23 06:44:41,406 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-23 06:44:41,407 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-12-23 06:44:41,451 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.12 06:44:41 BoogieIcfgContainer [2020-12-23 06:44:41,451 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-23 06:44:41,452 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-23 06:44:41,452 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-23 06:44:41,452 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-23 06:44:41,453 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 06:44:30" (3/4) ... [2020-12-23 06:44:41,456 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-23 06:44:41,549 INFO L141 WitnessManager]: Wrote witness to /storage/repos/svcomp/c/loops/invert_string-1.c-witness.graphml [2020-12-23 06:44:41,549 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-23 06:44:41,550 INFO L168 Benchmark]: Toolchain (without parser) took 12248.60 ms. Allocated memory was 153.1 MB in the beginning and 222.3 MB in the end (delta: 69.2 MB). Free memory was 127.8 MB in the beginning and 134.4 MB in the end (delta: -6.7 MB). Peak memory consumption was 63.7 MB. Max. memory is 8.0 GB. [2020-12-23 06:44:41,551 INFO L168 Benchmark]: CDTParser took 0.35 ms. Allocated memory is still 153.1 MB. Free memory is still 126.2 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-12-23 06:44:41,552 INFO L168 Benchmark]: CACSL2BoogieTranslator took 383.67 ms. Allocated memory is still 153.1 MB. Free memory was 127.8 MB in the beginning and 117.6 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. [2020-12-23 06:44:41,553 INFO L168 Benchmark]: Boogie Procedure Inliner took 52.20 ms. Allocated memory is still 153.1 MB. Free memory was 117.6 MB in the beginning and 116.1 MB in the end (delta: 1.5 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-23 06:44:41,553 INFO L168 Benchmark]: Boogie Preprocessor took 34.18 ms. Allocated memory is still 153.1 MB. Free memory was 116.1 MB in the beginning and 114.9 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-23 06:44:41,554 INFO L168 Benchmark]: RCFGBuilder took 515.03 ms. Allocated memory is still 153.1 MB. Free memory was 114.9 MB in the beginning and 100.2 MB in the end (delta: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2020-12-23 06:44:41,554 INFO L168 Benchmark]: TraceAbstraction took 11152.88 ms. Allocated memory was 153.1 MB in the beginning and 222.3 MB in the end (delta: 69.2 MB). Free memory was 99.8 MB in the beginning and 137.6 MB in the end (delta: -37.8 MB). Peak memory consumption was 32.3 MB. Max. memory is 8.0 GB. [2020-12-23 06:44:41,562 INFO L168 Benchmark]: Witness Printer took 97.23 ms. Allocated memory is still 222.3 MB. Free memory was 137.6 MB in the beginning and 134.4 MB in the end (delta: 3.1 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. [2020-12-23 06:44:41,568 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.35 ms. Allocated memory is still 153.1 MB. Free memory is still 126.2 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 383.67 ms. Allocated memory is still 153.1 MB. Free memory was 127.8 MB in the beginning and 117.6 MB in the end (delta: 10.2 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 52.20 ms. Allocated memory is still 153.1 MB. Free memory was 117.6 MB in the beginning and 116.1 MB in the end (delta: 1.5 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 34.18 ms. Allocated memory is still 153.1 MB. Free memory was 116.1 MB in the beginning and 114.9 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 515.03 ms. Allocated memory is still 153.1 MB. Free memory was 114.9 MB in the beginning and 100.2 MB in the end (delta: 14.7 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 11152.88 ms. Allocated memory was 153.1 MB in the beginning and 222.3 MB in the end (delta: 69.2 MB). Free memory was 99.8 MB in the beginning and 137.6 MB in the end (delta: -37.8 MB). Peak memory consumption was 32.3 MB. Max. memory is 8.0 GB. * Witness Printer took 97.23 ms. Allocated memory is still 222.3 MB. Free memory was 137.6 MB in the beginning and 134.4 MB in the end (delta: 3.1 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 8]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L16] int MAX = __VERIFIER_nondet_uint(); [L17] COND FALSE !(!(MAX > 0)) [L18] char str1[MAX], str2[MAX]; [L19] int cont, i, j; [L20] cont = 0 [L22] i=0 [L22] COND TRUE i= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ [L29] i-- [L29] COND TRUE i >= 0 [L30] EXPR str1[0] [L30] str2[j] = str1[0] [L31] j++ [L29] i-- [L29] COND FALSE !(i >= 0) [L34] j = MAX-1 [L35] i=0 [L35] COND TRUE i