/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-dev-4f750a8 [2020-12-22 04:20:50,839 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-22 04:20:50,843 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-22 04:20:50,899 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-22 04:20:50,900 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-22 04:20:50,903 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-22 04:20:50,908 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-22 04:20:50,916 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-22 04:20:50,919 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-22 04:20:50,926 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-22 04:20:50,927 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-22 04:20:50,929 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... 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[2020-12-22 04:20:50,993 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-22 04:20:50,994 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-22 04:20:50,995 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-22 04:20:50,996 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-22 04:20:51,055 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-22 04:20:51,056 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-22 04:20:51,060 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-22 04:20:51,060 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-22 04:20:51,060 INFO L138 SettingsManager]: * Use SBE=true [2020-12-22 04:20:51,061 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-22 04:20:51,061 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-22 04:20:51,061 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-22 04:20:51,061 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-22 04:20:51,062 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-22 04:20:51,063 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-22 04:20:51,063 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-22 04:20:51,063 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-22 04:20:51,064 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-22 04:20:51,064 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-22 04:20:51,064 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-22 04:20:51,064 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-22 04:20:51,064 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-22 04:20:51,065 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-22 04:20:51,065 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-22 04:20:51,066 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-22 04:20:51,066 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-22 04:20:51,066 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-22 04:20:51,066 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-22 04:20:51,066 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-22 04:20:51,067 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/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-22 04:20:51,520 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-22 04:20:51,550 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-22 04:20:51,553 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-22 04:20:51,554 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-22 04:20:51,557 INFO L275 PluginConnector]: CDTParser initialized [2020-12-22 04:20:51,559 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops/string-2.i [2020-12-22 04:20:51,654 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fc6bd894b/402c845b6b314195b838e357a584ad01/FLAGcaa7ab2ec [2020-12-22 04:20:52,272 INFO L306 CDTParser]: Found 1 translation units. [2020-12-22 04:20:52,272 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops/string-2.i [2020-12-22 04:20:52,281 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fc6bd894b/402c845b6b314195b838e357a584ad01/FLAGcaa7ab2ec [2020-12-22 04:20:52,631 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fc6bd894b/402c845b6b314195b838e357a584ad01 [2020-12-22 04:20:52,636 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-22 04:20:52,639 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-22 04:20:52,641 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-22 04:20:52,641 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-22 04:20:52,645 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-22 04:20:52,646 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 04:20:52" (1/1) ... [2020-12-22 04:20:52,648 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6b34a703 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:20:52, skipping insertion in model container [2020-12-22 04:20:52,648 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 04:20:52" (1/1) ... [2020-12-22 04:20:52,662 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-22 04:20:52,685 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-22 04:20:52,883 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops/string-2.i[896,909] [2020-12-22 04:20:52,915 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 04:20:52,927 INFO L203 MainTranslator]: Completed pre-run [2020-12-22 04:20:52,941 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops/string-2.i[896,909] [2020-12-22 04:20:52,961 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 04:20:52,983 INFO L208 MainTranslator]: Completed translation [2020-12-22 04:20:52,984 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:20:52 WrapperNode [2020-12-22 04:20:52,984 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-22 04:20:52,985 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-22 04:20:52,986 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-22 04:20:52,986 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-22 04:20:52,995 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:20:52" (1/1) ... [2020-12-22 04:20:53,005 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:20:52" (1/1) ... [2020-12-22 04:20:53,035 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-22 04:20:53,037 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-22 04:20:53,037 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-22 04:20:53,037 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-22 04:20:53,048 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:20:52" (1/1) ... [2020-12-22 04:20:53,048 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:20:52" (1/1) ... [2020-12-22 04:20:53,052 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:20:52" (1/1) ... [2020-12-22 04:20:53,052 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:20:52" (1/1) ... [2020-12-22 04:20:53,062 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:20:52" (1/1) ... [2020-12-22 04:20:53,068 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:20:52" (1/1) ... [2020-12-22 04:20:53,070 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:20:52" (1/1) ... [2020-12-22 04:20:53,073 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-22 04:20:53,075 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-22 04:20:53,075 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-22 04:20:53,075 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-22 04:20:53,076 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:20:52" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-22 04:20:53,179 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-22 04:20:53,180 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-22 04:20:53,180 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-22 04:20:53,180 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-22 04:20:53,180 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-22 04:20:53,181 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-22 04:20:53,181 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-22 04:20:53,619 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-22 04:20:53,619 INFO L299 CfgBuilder]: Removed 11 assume(true) statements. [2020-12-22 04:20:53,622 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 04:20:53 BoogieIcfgContainer [2020-12-22 04:20:53,622 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-22 04:20:53,626 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-22 04:20:53,626 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-22 04:20:53,631 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-22 04:20:53,632 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 04:20:52" (1/3) ... [2020-12-22 04:20:53,633 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@56e02c4e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 04:20:53, skipping insertion in model container [2020-12-22 04:20:53,633 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 04:20:52" (2/3) ... [2020-12-22 04:20:53,634 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@56e02c4e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 04:20:53, skipping insertion in model container [2020-12-22 04:20:53,634 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 04:20:53" (3/3) ... [2020-12-22 04:20:53,637 INFO L111 eAbstractionObserver]: Analyzing ICFG string-2.i [2020-12-22 04:20:53,646 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-22 04:20:53,653 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-22 04:20:53,709 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-22 04:20:53,743 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-22 04:20:53,744 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-22 04:20:53,744 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-22 04:20:53,744 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-22 04:20:53,744 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-22 04:20:53,744 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-22 04:20:53,744 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-22 04:20:53,745 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-22 04:20:53,763 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2020-12-22 04:20:53,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-12-22 04:20:53,770 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:20:53,771 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 04:20:53,771 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:20:53,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:20:53,779 INFO L82 PathProgramCache]: Analyzing trace with hash 374782792, now seen corresponding path program 1 times [2020-12-22 04:20:53,790 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:20:53,791 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1573693373] [2020-12-22 04:20:53,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:20:53,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:20:54,057 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 04:20:54,059 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1573693373] [2020-12-22 04:20:54,060 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 04:20:54,061 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-22 04:20:54,063 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1881881095] [2020-12-22 04:20:54,070 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-12-22 04:20:54,071 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:20:54,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-12-22 04:20:54,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-22 04:20:54,102 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 2 states. [2020-12-22 04:20:54,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:20:54,136 INFO L93 Difference]: Finished difference Result 48 states and 74 transitions. [2020-12-22 04:20:54,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-12-22 04:20:54,138 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 16 [2020-12-22 04:20:54,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:20:54,160 INFO L225 Difference]: With dead ends: 48 [2020-12-22 04:20:54,161 INFO L226 Difference]: Without dead ends: 22 [2020-12-22 04:20:54,165 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 [2020-12-22 04:20:54,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-12-22 04:20:54,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-12-22 04:20:54,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-12-22 04:20:54,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2020-12-22 04:20:54,222 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 16 [2020-12-22 04:20:54,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:20:54,223 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2020-12-22 04:20:54,223 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-12-22 04:20:54,223 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2020-12-22 04:20:54,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-12-22 04:20:54,226 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:20:54,226 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 04:20:54,226 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-22 04:20:54,227 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:20:54,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:20:54,233 INFO L82 PathProgramCache]: Analyzing trace with hash 1602331574, now seen corresponding path program 1 times [2020-12-22 04:20:54,233 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:20:54,234 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1597541977] [2020-12-22 04:20:54,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:20:54,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:20:54,386 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 04:20:54,387 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1597541977] [2020-12-22 04:20:54,388 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 04:20:54,388 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-22 04:20:54,390 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [644497377] [2020-12-22 04:20:54,394 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-22 04:20:54,394 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:20:54,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-22 04:20:54,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-22 04:20:54,396 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand 3 states. [2020-12-22 04:20:54,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:20:54,526 INFO L93 Difference]: Finished difference Result 50 states and 62 transitions. [2020-12-22 04:20:54,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-22 04:20:54,527 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 18 [2020-12-22 04:20:54,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:20:54,531 INFO L225 Difference]: With dead ends: 50 [2020-12-22 04:20:54,531 INFO L226 Difference]: Without dead ends: 32 [2020-12-22 04:20:54,533 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 [2020-12-22 04:20:54,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-12-22 04:20:54,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 24. [2020-12-22 04:20:54,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-12-22 04:20:54,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2020-12-22 04:20:54,551 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 18 [2020-12-22 04:20:54,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:20:54,552 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2020-12-22 04:20:54,552 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-22 04:20:54,552 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2020-12-22 04:20:54,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-12-22 04:20:54,554 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:20:54,554 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 04:20:54,555 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-22 04:20:54,555 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:20:54,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:20:54,557 INFO L82 PathProgramCache]: Analyzing trace with hash 177830358, now seen corresponding path program 1 times [2020-12-22 04:20:54,558 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:20:54,558 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [131200459] [2020-12-22 04:20:54,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:20:54,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:20:54,656 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-22 04:20:54,657 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [131200459] [2020-12-22 04:20:54,657 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1727530546] [2020-12-22 04:20:54,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -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 [2020-12-22 04:20:54,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:20:54,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-22 04:20:54,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:20:54,801 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-22 04:20:54,802 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:20:54,802 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-22 04:20:54,803 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351823603] [2020-12-22 04:20:54,803 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-22 04:20:54,804 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:20:54,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-22 04:20:54,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-22 04:20:54,805 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand 5 states. [2020-12-22 04:20:54,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:20:54,866 INFO L93 Difference]: Finished difference Result 61 states and 74 transitions. [2020-12-22 04:20:54,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-22 04:20:54,867 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 22 [2020-12-22 04:20:54,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:20:54,868 INFO L225 Difference]: With dead ends: 61 [2020-12-22 04:20:54,869 INFO L226 Difference]: Without dead ends: 42 [2020-12-22 04:20:54,869 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 [2020-12-22 04:20:54,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-12-22 04:20:54,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 28. [2020-12-22 04:20:54,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-12-22 04:20:54,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2020-12-22 04:20:54,876 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 22 [2020-12-22 04:20:54,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:20:54,876 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2020-12-22 04:20:54,876 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-22 04:20:54,876 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2020-12-22 04:20:54,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-12-22 04:20:54,877 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:20:54,877 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] [2020-12-22 04:20:55,092 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-12-22 04:20:55,093 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:20:55,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:20:55,094 INFO L82 PathProgramCache]: Analyzing trace with hash 1590720246, now seen corresponding path program 2 times [2020-12-22 04:20:55,095 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:20:55,095 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1911743326] [2020-12-22 04:20:55,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:20:55,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:20:55,162 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-22 04:20:55,163 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1911743326] [2020-12-22 04:20:55,163 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [443443924] [2020-12-22 04:20:55,164 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 04:20:55,271 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-22 04:20:55,271 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 04:20:55,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-22 04:20:55,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:20:55,342 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-12-22 04:20:55,343 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:20:55,343 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-22 04:20:55,343 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780334060] [2020-12-22 04:20:55,344 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-22 04:20:55,345 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:20:55,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-22 04:20:55,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-22 04:20:55,347 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand 6 states. [2020-12-22 04:20:55,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:20:55,445 INFO L93 Difference]: Finished difference Result 73 states and 87 transitions. [2020-12-22 04:20:55,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-22 04:20:55,446 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 26 [2020-12-22 04:20:55,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:20:55,447 INFO L225 Difference]: With dead ends: 73 [2020-12-22 04:20:55,448 INFO L226 Difference]: Without dead ends: 52 [2020-12-22 04:20:55,450 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 [2020-12-22 04:20:55,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-12-22 04:20:55,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 32. [2020-12-22 04:20:55,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-12-22 04:20:55,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 37 transitions. [2020-12-22 04:20:55,465 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 37 transitions. Word has length 26 [2020-12-22 04:20:55,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:20:55,465 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 37 transitions. [2020-12-22 04:20:55,466 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-22 04:20:55,466 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 37 transitions. [2020-12-22 04:20:55,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-12-22 04:20:55,468 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:20:55,468 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] [2020-12-22 04:20:55,682 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 04:20:55,683 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:20:55,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:20:55,684 INFO L82 PathProgramCache]: Analyzing trace with hash -381068522, now seen corresponding path program 3 times [2020-12-22 04:20:55,684 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:20:55,685 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1851979537] [2020-12-22 04:20:55,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:20:55,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:20:55,804 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-12-22 04:20:55,804 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1851979537] [2020-12-22 04:20:55,805 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1114748655] [2020-12-22 04:20:55,805 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 04:20:55,902 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-12-22 04:20:55,903 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 04:20:55,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-22 04:20:55,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:20:55,980 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-12-22 04:20:55,980 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:20:55,981 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-22 04:20:55,981 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [427715380] [2020-12-22 04:20:55,981 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-22 04:20:55,982 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:20:55,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-22 04:20:55,983 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-22 04:20:55,983 INFO L87 Difference]: Start difference. First operand 32 states and 37 transitions. Second operand 7 states. [2020-12-22 04:20:56,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:20:56,071 INFO L93 Difference]: Finished difference Result 85 states and 100 transitions. [2020-12-22 04:20:56,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-22 04:20:56,071 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 30 [2020-12-22 04:20:56,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:20:56,072 INFO L225 Difference]: With dead ends: 85 [2020-12-22 04:20:56,072 INFO L226 Difference]: Without dead ends: 62 [2020-12-22 04:20:56,073 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 [2020-12-22 04:20:56,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-12-22 04:20:56,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 36. [2020-12-22 04:20:56,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-12-22 04:20:56,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2020-12-22 04:20:56,079 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 30 [2020-12-22 04:20:56,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:20:56,079 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2020-12-22 04:20:56,079 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-22 04:20:56,079 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2020-12-22 04:20:56,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-12-22 04:20:56,080 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:20:56,080 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] [2020-12-22 04:20:56,293 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 04:20:56,294 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:20:56,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:20:56,295 INFO L82 PathProgramCache]: Analyzing trace with hash -583604682, now seen corresponding path program 4 times [2020-12-22 04:20:56,295 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:20:56,296 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [643290781] [2020-12-22 04:20:56,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:20:56,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 04:20:56,418 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-22 04:20:56,419 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [643290781] [2020-12-22 04:20:56,419 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [716051115] [2020-12-22 04:20:56,419 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 04:20:56,479 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-22 04:20:56,479 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 04:20:56,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-22 04:20:56,483 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 04:20:56,538 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-22 04:20:56,539 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 04:20:56,539 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-22 04:20:56,539 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1552760221] [2020-12-22 04:20:56,540 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-22 04:20:56,540 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 04:20:56,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-22 04:20:56,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-22 04:20:56,541 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand 8 states. [2020-12-22 04:20:56,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 04:20:56,671 INFO L93 Difference]: Finished difference Result 95 states and 111 transitions. [2020-12-22 04:20:56,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-22 04:20:56,672 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 34 [2020-12-22 04:20:56,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 04:20:56,674 INFO L225 Difference]: With dead ends: 95 [2020-12-22 04:20:56,674 INFO L226 Difference]: Without dead ends: 70 [2020-12-22 04:20:56,677 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 [2020-12-22 04:20:56,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-12-22 04:20:56,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 40. [2020-12-22 04:20:56,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-12-22 04:20:56,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 45 transitions. [2020-12-22 04:20:56,683 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 45 transitions. Word has length 34 [2020-12-22 04:20:56,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 04:20:56,684 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 45 transitions. [2020-12-22 04:20:56,684 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-22 04:20:56,684 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 45 transitions. [2020-12-22 04:20:56,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-12-22 04:20:56,685 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 04:20:56,685 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] [2020-12-22 04:20:56,889 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 04:20:56,890 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 04:20:56,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 04:20:56,891 INFO L82 PathProgramCache]: Analyzing trace with hash -270804906, now seen corresponding path program 5 times [2020-12-22 04:20:56,892 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 04:20:56,892 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1634807371] [2020-12-22 04:20:56,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 04:20:56,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-22 04:20:56,944 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-22 04:20:56,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-22 04:20:56,984 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-22 04:20:57,016 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-22 04:20:57,017 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-22 04:20:57,017 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-12-22 04:20:57,070 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.12 04:20:57 BoogieIcfgContainer [2020-12-22 04:20:57,071 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-22 04:20:57,071 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-22 04:20:57,071 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-22 04:20:57,072 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-22 04:20:57,072 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 04:20:53" (3/4) ... [2020-12-22 04:20:57,077 INFO L140 WitnessPrinter]: No result that supports witness generation found [2020-12-22 04:20:57,077 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-22 04:20:57,079 INFO L168 Benchmark]: Toolchain (without parser) took 4439.68 ms. Allocated memory was 151.0 MB in the beginning and 182.5 MB in the end (delta: 31.5 MB). Free memory was 126.5 MB in the beginning and 143.3 MB in the end (delta: -16.7 MB). Peak memory consumption was 15.5 MB. Max. memory is 8.0 GB. [2020-12-22 04:20:57,080 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 151.0 MB. Free memory is still 130.5 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-12-22 04:20:57,081 INFO L168 Benchmark]: CACSL2BoogieTranslator took 343.55 ms. Allocated memory is still 151.0 MB. Free memory was 126.3 MB in the beginning and 116.0 MB in the end (delta: 10.3 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. [2020-12-22 04:20:57,082 INFO L168 Benchmark]: Boogie Procedure Inliner took 50.44 ms. Allocated memory is still 151.0 MB. Free memory was 116.0 MB in the beginning and 114.3 MB in the end (delta: 1.7 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-22 04:20:57,083 INFO L168 Benchmark]: Boogie Preprocessor took 37.16 ms. Allocated memory is still 151.0 MB. Free memory was 114.3 MB in the beginning and 113.1 MB in the end (delta: 1.2 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-22 04:20:57,084 INFO L168 Benchmark]: RCFGBuilder took 547.58 ms. Allocated memory is still 151.0 MB. Free memory was 112.9 MB in the beginning and 96.4 MB in the end (delta: 16.4 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. [2020-12-22 04:20:57,085 INFO L168 Benchmark]: TraceAbstraction took 3444.81 ms. Allocated memory was 151.0 MB in the beginning and 182.5 MB in the end (delta: 31.5 MB). Free memory was 95.9 MB in the beginning and 143.8 MB in the end (delta: -47.9 MB). There was no memory consumed. Max. memory is 8.0 GB. [2020-12-22 04:20:57,085 INFO L168 Benchmark]: Witness Printer took 5.77 ms. Allocated memory is still 182.5 MB. Free memory is still 143.3 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-12-22 04:20:57,089 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 151.0 MB. Free memory is still 130.5 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 343.55 ms. Allocated memory is still 151.0 MB. Free memory was 126.3 MB in the beginning and 116.0 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 50.44 ms. Allocated memory is still 151.0 MB. Free memory was 116.0 MB in the beginning and 114.3 MB in the end (delta: 1.7 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 37.16 ms. Allocated memory is still 151.0 MB. Free memory was 114.3 MB in the beginning and 113.1 MB in the end (delta: 1.2 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 547.58 ms. Allocated memory is still 151.0 MB. Free memory was 112.9 MB in the beginning and 96.4 MB in the end (delta: 16.4 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 3444.81 ms. Allocated memory was 151.0 MB in the beginning and 182.5 MB in the end (delta: 31.5 MB). Free memory was 95.9 MB in the beginning and 143.8 MB in the end (delta: -47.9 MB). There was no memory consumed. Max. memory is 8.0 GB. * Witness Printer took 5.77 ms. Allocated memory is still 182.5 MB. Free memory is still 143.3 MB. 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)<