./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/loops/string-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9a8b2e8d Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/loops/string-2.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 826ba3ecb74a591f4e23afc2c932e6d22d2291c8 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/loops/string-2.i -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 826ba3ecb74a591f4e23afc2c932e6d22d2291c8 ........................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: UNKNOWN --- Real Ultimate output --- This is Ultimate 0.1.25-9a8b2e8 [2020-10-20 00:55:30,018 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-20 00:55:30,022 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-20 00:55:30,062 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-20 00:55:30,062 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-20 00:55:30,072 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-20 00:55:30,074 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-20 00:55:30,078 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-20 00:55:30,081 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-20 00:55:30,085 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-20 00:55:30,087 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-20 00:55:30,088 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-20 00:55:30,089 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-20 00:55:30,092 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-20 00:55:30,094 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-20 00:55:30,096 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-20 00:55:30,098 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-20 00:55:30,099 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-20 00:55:30,101 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-20 00:55:30,109 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-20 00:55:30,112 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-20 00:55:30,113 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-20 00:55:30,115 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-20 00:55:30,116 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-20 00:55:30,128 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-20 00:55:30,129 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-20 00:55:30,129 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-20 00:55:30,130 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-20 00:55:30,133 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-20 00:55:30,135 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-20 00:55:30,135 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-20 00:55:30,136 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-20 00:55:30,136 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-20 00:55:30,137 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-20 00:55:30,138 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-20 00:55:30,139 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-20 00:55:30,140 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-20 00:55:30,140 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-20 00:55:30,140 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-20 00:55:30,141 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-20 00:55:30,142 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-20 00:55:30,143 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2020-10-20 00:55:30,176 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-20 00:55:30,176 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-20 00:55:30,178 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-20 00:55:30,178 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-20 00:55:30,179 INFO L138 SettingsManager]: * Use SBE=true [2020-10-20 00:55:30,179 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-20 00:55:30,179 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-20 00:55:30,179 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-20 00:55:30,180 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-20 00:55:30,180 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-20 00:55:30,181 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-20 00:55:30,181 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-20 00:55:30,181 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-20 00:55:30,182 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-20 00:55:30,182 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-20 00:55:30,182 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-20 00:55:30,183 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-20 00:55:30,183 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-20 00:55:30,183 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-20 00:55:30,183 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-20 00:55:30,184 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-20 00:55:30,184 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-20 00:55:30,184 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-20 00:55:30,185 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-20 00:55:30,185 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-20 00:55:30,185 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-20 00:55:30,185 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-20 00:55:30,185 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-20 00:55:30,186 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-20 00:55:30,186 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 826ba3ecb74a591f4e23afc2c932e6d22d2291c8 [2020-10-20 00:55:30,403 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-20 00:55:30,421 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-20 00:55:30,427 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-20 00:55:30,429 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-20 00:55:30,430 INFO L275 PluginConnector]: CDTParser initialized [2020-10-20 00:55:30,431 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops/string-2.i [2020-10-20 00:55:30,491 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cc924fc12/fdbfe0a7585542869b45a065e4868b42/FLAGef4c22867 [2020-10-20 00:55:30,893 INFO L306 CDTParser]: Found 1 translation units. [2020-10-20 00:55:30,894 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops/string-2.i [2020-10-20 00:55:30,901 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cc924fc12/fdbfe0a7585542869b45a065e4868b42/FLAGef4c22867 [2020-10-20 00:55:31,317 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/cc924fc12/fdbfe0a7585542869b45a065e4868b42 [2020-10-20 00:55:31,321 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-20 00:55:31,329 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-10-20 00:55:31,330 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-20 00:55:31,331 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-20 00:55:31,335 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-20 00:55:31,336 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.10 12:55:31" (1/1) ... [2020-10-20 00:55:31,339 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3a7416e3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:31, skipping insertion in model container [2020-10-20 00:55:31,340 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.10 12:55:31" (1/1) ... [2020-10-20 00:55:31,348 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-20 00:55:31,369 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-20 00:55:31,764 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-20 00:55:31,776 INFO L203 MainTranslator]: Completed pre-run [2020-10-20 00:55:31,826 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-20 00:55:31,854 INFO L208 MainTranslator]: Completed translation [2020-10-20 00:55:31,855 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:31 WrapperNode [2020-10-20 00:55:31,856 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-20 00:55:31,857 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-10-20 00:55:31,857 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-10-20 00:55:31,857 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-10-20 00:55:31,867 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:31" (1/1) ... [2020-10-20 00:55:31,889 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:31" (1/1) ... [2020-10-20 00:55:31,928 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-10-20 00:55:31,930 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-20 00:55:31,930 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-20 00:55:31,930 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-20 00:55:31,941 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:31" (1/1) ... [2020-10-20 00:55:31,942 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:31" (1/1) ... [2020-10-20 00:55:31,955 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:31" (1/1) ... [2020-10-20 00:55:31,956 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:31" (1/1) ... [2020-10-20 00:55:31,976 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:31" (1/1) ... [2020-10-20 00:55:31,982 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:31" (1/1) ... [2020-10-20 00:55:31,984 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:31" (1/1) ... [2020-10-20 00:55:31,987 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-20 00:55:31,988 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-20 00:55:31,988 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-20 00:55:31,988 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-20 00:55:31,989 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:31" (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 [2020-10-20 00:55:32,065 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-20 00:55:32,065 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-20 00:55:32,065 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-20 00:55:32,066 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-20 00:55:32,066 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-20 00:55:32,066 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-20 00:55:32,066 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-20 00:55:32,359 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-20 00:55:32,359 INFO L298 CfgBuilder]: Removed 13 assume(true) statements. [2020-10-20 00:55:32,361 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 12:55:32 BoogieIcfgContainer [2020-10-20 00:55:32,361 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-20 00:55:32,363 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-20 00:55:32,363 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-20 00:55:32,366 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-20 00:55:32,367 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.10 12:55:31" (1/3) ... [2020-10-20 00:55:32,368 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3dd2cda6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.10 12:55:32, skipping insertion in model container [2020-10-20 00:55:32,368 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:31" (2/3) ... [2020-10-20 00:55:32,368 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3dd2cda6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.10 12:55:32, skipping insertion in model container [2020-10-20 00:55:32,368 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 12:55:32" (3/3) ... [2020-10-20 00:55:32,370 INFO L111 eAbstractionObserver]: Analyzing ICFG string-2.i [2020-10-20 00:55:32,387 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-10-20 00:55:32,397 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-20 00:55:32,417 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-20 00:55:32,471 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-20 00:55:32,476 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-20 00:55:32,476 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-10-20 00:55:32,477 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-20 00:55:32,477 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-20 00:55:32,478 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-20 00:55:32,478 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-20 00:55:32,478 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-20 00:55:32,512 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-10-20 00:55:32,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-10-20 00:55:32,527 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 00:55:32,530 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 00:55:32,531 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-20 00:55:32,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 00:55:32,541 INFO L82 PathProgramCache]: Analyzing trace with hash -610986519, now seen corresponding path program 1 times [2020-10-20 00:55:32,551 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 00:55:32,556 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [730510415] [2020-10-20 00:55:32,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 00:55:32,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 00:55:32,705 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 00:55:32,706 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [730510415] [2020-10-20 00:55:32,707 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-20 00:55:32,708 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-10-20 00:55:32,709 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238911996] [2020-10-20 00:55:32,718 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-10-20 00:55:32,719 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 00:55:32,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-10-20 00:55:32,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-10-20 00:55:32,732 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 2 states. [2020-10-20 00:55:32,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 00:55:32,754 INFO L93 Difference]: Finished difference Result 53 states and 81 transitions. [2020-10-20 00:55:32,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-10-20 00:55:32,756 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 18 [2020-10-20 00:55:32,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-20 00:55:32,767 INFO L225 Difference]: With dead ends: 53 [2020-10-20 00:55:32,767 INFO L226 Difference]: Without dead ends: 24 [2020-10-20 00:55:32,771 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 [2020-10-20 00:55:32,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-10-20 00:55:32,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-10-20 00:55:32,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-10-20 00:55:32,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2020-10-20 00:55:32,811 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 18 [2020-10-20 00:55:32,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-20 00:55:32,811 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2020-10-20 00:55:32,812 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-10-20 00:55:32,812 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2020-10-20 00:55:32,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-10-20 00:55:32,813 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 00:55:32,813 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] [2020-10-20 00:55:32,814 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-20 00:55:32,814 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-20 00:55:32,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 00:55:32,822 INFO L82 PathProgramCache]: Analyzing trace with hash -2052613417, now seen corresponding path program 1 times [2020-10-20 00:55:32,822 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 00:55:32,822 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1673943822] [2020-10-20 00:55:32,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 00:55:32,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 00:55:32,894 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 00:55:32,894 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1673943822] [2020-10-20 00:55:32,895 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-20 00:55:32,895 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-10-20 00:55:32,896 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [563099435] [2020-10-20 00:55:32,898 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-10-20 00:55:32,898 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 00:55:32,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-10-20 00:55:32,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-10-20 00:55:32,900 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand 3 states. [2020-10-20 00:55:32,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 00:55:32,956 INFO L93 Difference]: Finished difference Result 56 states and 68 transitions. [2020-10-20 00:55:32,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-10-20 00:55:32,957 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-10-20 00:55:32,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-20 00:55:32,960 INFO L225 Difference]: With dead ends: 56 [2020-10-20 00:55:32,961 INFO L226 Difference]: Without dead ends: 36 [2020-10-20 00:55:32,962 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 [2020-10-20 00:55:32,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-10-20 00:55:32,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 26. [2020-10-20 00:55:32,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-10-20 00:55:32,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 31 transitions. [2020-10-20 00:55:32,970 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 31 transitions. Word has length 20 [2020-10-20 00:55:32,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-20 00:55:32,971 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 31 transitions. [2020-10-20 00:55:32,971 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-10-20 00:55:32,971 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 31 transitions. [2020-10-20 00:55:32,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-10-20 00:55:32,972 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 00:55:32,972 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 00:55:32,973 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-20 00:55:32,973 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-20 00:55:32,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 00:55:32,974 INFO L82 PathProgramCache]: Analyzing trace with hash -903714569, now seen corresponding path program 1 times [2020-10-20 00:55:32,974 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 00:55:32,975 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [216881127] [2020-10-20 00:55:32,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 00:55:32,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 00:55:33,028 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-20 00:55:33,029 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [216881127] [2020-10-20 00:55:33,029 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1551361462] [2020-10-20 00:55:33,030 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 [2020-10-20 00:55:33,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 00:55:33,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 3 conjunts are in the unsatisfiable core [2020-10-20 00:55:33,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 00:55:33,194 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-10-20 00:55:33,195 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-20 00:55:33,195 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-10-20 00:55:33,196 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139308157] [2020-10-20 00:55:33,196 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-20 00:55:33,196 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 00:55:33,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-20 00:55:33,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-10-20 00:55:33,197 INFO L87 Difference]: Start difference. First operand 26 states and 31 transitions. Second operand 5 states. [2020-10-20 00:55:33,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 00:55:33,267 INFO L93 Difference]: Finished difference Result 69 states and 82 transitions. [2020-10-20 00:55:33,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-20 00:55:33,268 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2020-10-20 00:55:33,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-20 00:55:33,269 INFO L225 Difference]: With dead ends: 69 [2020-10-20 00:55:33,269 INFO L226 Difference]: Without dead ends: 48 [2020-10-20 00:55:33,270 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-10-20 00:55:33,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-10-20 00:55:33,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 30. [2020-10-20 00:55:33,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-10-20 00:55:33,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2020-10-20 00:55:33,277 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 24 [2020-10-20 00:55:33,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-20 00:55:33,277 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2020-10-20 00:55:33,277 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-20 00:55:33,278 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2020-10-20 00:55:33,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-10-20 00:55:33,279 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 00:55:33,279 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, 1, 1] [2020-10-20 00:55:33,492 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-10-20 00:55:33,493 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-20 00:55:33,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 00:55:33,493 INFO L82 PathProgramCache]: Analyzing trace with hash -326197737, now seen corresponding path program 2 times [2020-10-20 00:55:33,493 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 00:55:33,494 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [792302213] [2020-10-20 00:55:33,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 00:55:33,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 00:55:33,573 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-10-20 00:55:33,574 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [792302213] [2020-10-20 00:55:33,574 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [589729213] [2020-10-20 00:55:33,574 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 [2020-10-20 00:55:33,655 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-10-20 00:55:33,655 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-20 00:55:33,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 4 conjunts are in the unsatisfiable core [2020-10-20 00:55:33,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 00:55:33,700 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-10-20 00:55:33,700 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-20 00:55:33,701 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-10-20 00:55:33,701 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1839633832] [2020-10-20 00:55:33,701 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-20 00:55:33,702 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 00:55:33,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-20 00:55:33,702 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-10-20 00:55:33,702 INFO L87 Difference]: Start difference. First operand 30 states and 35 transitions. Second operand 6 states. [2020-10-20 00:55:33,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 00:55:33,825 INFO L93 Difference]: Finished difference Result 83 states and 97 transitions. [2020-10-20 00:55:33,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-20 00:55:33,826 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-10-20 00:55:33,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-20 00:55:33,827 INFO L225 Difference]: With dead ends: 83 [2020-10-20 00:55:33,827 INFO L226 Difference]: Without dead ends: 60 [2020-10-20 00:55:33,829 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-10-20 00:55:33,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-10-20 00:55:33,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 34. [2020-10-20 00:55:33,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-10-20 00:55:33,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2020-10-20 00:55:33,836 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 28 [2020-10-20 00:55:33,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-20 00:55:33,837 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2020-10-20 00:55:33,837 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-20 00:55:33,837 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2020-10-20 00:55:33,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-10-20 00:55:33,838 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 00:55:33,839 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, 1, 1] [2020-10-20 00:55:34,053 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-20 00:55:34,054 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-20 00:55:34,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 00:55:34,055 INFO L82 PathProgramCache]: Analyzing trace with hash -1134626249, now seen corresponding path program 3 times [2020-10-20 00:55:34,056 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 00:55:34,056 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2110955633] [2020-10-20 00:55:34,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 00:55:34,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 00:55:34,126 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-10-20 00:55:34,127 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2110955633] [2020-10-20 00:55:34,127 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1848768836] [2020-10-20 00:55:34,127 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 [2020-10-20 00:55:34,192 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-10-20 00:55:34,193 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-20 00:55:34,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 5 conjunts are in the unsatisfiable core [2020-10-20 00:55:34,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 00:55:34,227 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-10-20 00:55:34,228 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-20 00:55:34,228 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-10-20 00:55:34,228 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399105063] [2020-10-20 00:55:34,229 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-20 00:55:34,229 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 00:55:34,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-20 00:55:34,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-10-20 00:55:34,230 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 7 states. [2020-10-20 00:55:34,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 00:55:34,326 INFO L93 Difference]: Finished difference Result 97 states and 112 transitions. [2020-10-20 00:55:34,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-20 00:55:34,327 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 32 [2020-10-20 00:55:34,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-20 00:55:34,328 INFO L225 Difference]: With dead ends: 97 [2020-10-20 00:55:34,329 INFO L226 Difference]: Without dead ends: 72 [2020-10-20 00:55:34,332 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-10-20 00:55:34,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-10-20 00:55:34,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 38. [2020-10-20 00:55:34,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-10-20 00:55:34,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 43 transitions. [2020-10-20 00:55:34,348 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 43 transitions. Word has length 32 [2020-10-20 00:55:34,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-20 00:55:34,349 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 43 transitions. [2020-10-20 00:55:34,350 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-20 00:55:34,350 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 43 transitions. [2020-10-20 00:55:34,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-10-20 00:55:34,364 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 00:55:34,364 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 00:55:34,581 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-20 00:55:34,582 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-20 00:55:34,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 00:55:34,582 INFO L82 PathProgramCache]: Analyzing trace with hash 1796619607, now seen corresponding path program 4 times [2020-10-20 00:55:34,582 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 00:55:34,583 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1440817367] [2020-10-20 00:55:34,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 00:55:34,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 00:55:34,659 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-10-20 00:55:34,659 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1440817367] [2020-10-20 00:55:34,660 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2083718444] [2020-10-20 00:55:34,660 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 [2020-10-20 00:55:34,709 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-10-20 00:55:34,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-20 00:55:34,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 6 conjunts are in the unsatisfiable core [2020-10-20 00:55:34,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 00:55:34,739 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-10-20 00:55:34,740 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-20 00:55:34,748 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-10-20 00:55:34,749 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1044455033] [2020-10-20 00:55:34,749 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-20 00:55:34,749 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 00:55:34,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-20 00:55:34,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-10-20 00:55:34,751 INFO L87 Difference]: Start difference. First operand 38 states and 43 transitions. Second operand 8 states. [2020-10-20 00:55:34,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 00:55:34,836 INFO L93 Difference]: Finished difference Result 109 states and 125 transitions. [2020-10-20 00:55:34,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-20 00:55:34,836 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 36 [2020-10-20 00:55:34,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-20 00:55:34,837 INFO L225 Difference]: With dead ends: 109 [2020-10-20 00:55:34,837 INFO L226 Difference]: Without dead ends: 82 [2020-10-20 00:55:34,838 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-10-20 00:55:34,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-10-20 00:55:34,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 42. [2020-10-20 00:55:34,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-10-20 00:55:34,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 47 transitions. [2020-10-20 00:55:34,844 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 47 transitions. Word has length 36 [2020-10-20 00:55:34,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-20 00:55:34,845 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 47 transitions. [2020-10-20 00:55:34,845 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-20 00:55:34,845 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 47 transitions. [2020-10-20 00:55:34,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-10-20 00:55:34,846 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 00:55:34,846 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 00:55:35,056 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-20 00:55:35,057 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-20 00:55:35,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 00:55:35,058 INFO L82 PathProgramCache]: Analyzing trace with hash 1749493623, now seen corresponding path program 5 times [2020-10-20 00:55:35,058 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 00:55:35,059 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1688838840] [2020-10-20 00:55:35,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 00:55:35,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 00:55:35,134 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 00:55:35,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 00:55:35,214 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 00:55:35,262 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 00:55:35,262 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-20 00:55:35,262 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-10-20 00:55:35,330 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.10 12:55:35 BoogieIcfgContainer [2020-10-20 00:55:35,330 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-20 00:55:35,331 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-10-20 00:55:35,331 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-10-20 00:55:35,331 INFO L275 PluginConnector]: Witness Printer initialized [2020-10-20 00:55:35,331 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 12:55:32" (3/4) ... [2020-10-20 00:55:35,335 INFO L140 WitnessPrinter]: No result that supports witness generation found [2020-10-20 00:55:35,335 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-10-20 00:55:35,337 INFO L168 Benchmark]: Toolchain (without parser) took 4013.87 ms. Allocated memory was 37.7 MB in the beginning and 51.4 MB in the end (delta: 13.6 MB). Free memory was 11.6 MB in the beginning and 33.2 MB in the end (delta: -21.6 MB). There was no memory consumed. Max. memory is 14.3 GB. [2020-10-20 00:55:35,338 INFO L168 Benchmark]: CDTParser took 0.87 ms. Allocated memory is still 36.2 MB. Free memory was 14.6 MB in the beginning and 14.5 MB in the end (delta: 47.5 kB). Peak memory consumption was 47.5 kB. Max. memory is 14.3 GB. [2020-10-20 00:55:35,339 INFO L168 Benchmark]: CACSL2BoogieTranslator took 525.82 ms. Allocated memory was 37.7 MB in the beginning and 43.5 MB in the end (delta: 5.8 MB). Free memory was 10.7 MB in the beginning and 25.0 MB in the end (delta: -14.3 MB). Peak memory consumption was 5.9 MB. Max. memory is 14.3 GB. [2020-10-20 00:55:35,340 INFO L168 Benchmark]: Boogie Procedure Inliner took 72.25 ms. Allocated memory is still 43.5 MB. Free memory was 24.8 MB in the beginning and 22.9 MB in the end (delta: 1.9 MB). Peak memory consumption was 1.9 MB. Max. memory is 14.3 GB. [2020-10-20 00:55:35,341 INFO L168 Benchmark]: Boogie Preprocessor took 57.81 ms. Allocated memory is still 43.5 MB. Free memory was 22.9 MB in the beginning and 21.3 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.6 MB. Max. memory is 14.3 GB. [2020-10-20 00:55:35,342 INFO L168 Benchmark]: RCFGBuilder took 373.78 ms. Allocated memory was 43.5 MB in the beginning and 44.0 MB in the end (delta: 524.3 kB). Free memory was 21.2 MB in the beginning and 14.4 MB in the end (delta: 6.8 MB). Peak memory consumption was 9.5 MB. Max. memory is 14.3 GB. [2020-10-20 00:55:35,343 INFO L168 Benchmark]: TraceAbstraction took 2967.48 ms. Allocated memory was 44.0 MB in the beginning and 51.4 MB in the end (delta: 7.3 MB). Free memory was 13.9 MB in the beginning and 33.6 MB in the end (delta: -19.7 MB). Peak memory consumption was 10.4 MB. Max. memory is 14.3 GB. [2020-10-20 00:55:35,343 INFO L168 Benchmark]: Witness Printer took 4.68 ms. Allocated memory is still 51.4 MB. Free memory is still 33.2 MB. There was no memory consumed. Max. memory is 14.3 GB. [2020-10-20 00:55:35,348 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.87 ms. Allocated memory is still 36.2 MB. Free memory was 14.6 MB in the beginning and 14.5 MB in the end (delta: 47.5 kB). Peak memory consumption was 47.5 kB. Max. memory is 14.3 GB. * CACSL2BoogieTranslator took 525.82 ms. Allocated memory was 37.7 MB in the beginning and 43.5 MB in the end (delta: 5.8 MB). Free memory was 10.7 MB in the beginning and 25.0 MB in the end (delta: -14.3 MB). Peak memory consumption was 5.9 MB. Max. memory is 14.3 GB. * Boogie Procedure Inliner took 72.25 ms. Allocated memory is still 43.5 MB. Free memory was 24.8 MB in the beginning and 22.9 MB in the end (delta: 1.9 MB). Peak memory consumption was 1.9 MB. Max. memory is 14.3 GB. * Boogie Preprocessor took 57.81 ms. Allocated memory is still 43.5 MB. Free memory was 22.9 MB in the beginning and 21.3 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.6 MB. Max. memory is 14.3 GB. * RCFGBuilder took 373.78 ms. Allocated memory was 43.5 MB in the beginning and 44.0 MB in the end (delta: 524.3 kB). Free memory was 21.2 MB in the beginning and 14.4 MB in the end (delta: 6.8 MB). Peak memory consumption was 9.5 MB. Max. memory is 14.3 GB. * TraceAbstraction took 2967.48 ms. Allocated memory was 44.0 MB in the beginning and 51.4 MB in the end (delta: 7.3 MB). Free memory was 13.9 MB in the beginning and 33.6 MB in the end (delta: -19.7 MB). Peak memory consumption was 10.4 MB. Max. memory is 14.3 GB. * Witness Printer took 4.68 ms. Allocated memory is still 51.4 MB. Free memory is still 33.2 MB. There was no memory consumed. Max. memory is 14.3 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 12]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() 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)< main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 826ba3ecb74a591f4e23afc2c932e6d22d2291c8 [2020-10-20 00:55:37,875 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-20 00:55:37,886 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-20 00:55:37,890 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-20 00:55:37,891 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-20 00:55:37,892 INFO L275 PluginConnector]: CDTParser initialized [2020-10-20 00:55:37,893 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops/string-2.i [2020-10-20 00:55:37,953 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8b19f8447/bb775eb64c4b4e0c9bac09cab0fa42dd/FLAG2a71eb5d7 [2020-10-20 00:55:38,511 INFO L306 CDTParser]: Found 1 translation units. [2020-10-20 00:55:38,511 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/loops/string-2.i [2020-10-20 00:55:38,519 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8b19f8447/bb775eb64c4b4e0c9bac09cab0fa42dd/FLAG2a71eb5d7 [2020-10-20 00:55:38,895 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8b19f8447/bb775eb64c4b4e0c9bac09cab0fa42dd [2020-10-20 00:55:38,898 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-20 00:55:38,906 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-10-20 00:55:38,907 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-20 00:55:38,907 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-20 00:55:38,911 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-20 00:55:38,911 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.10 12:55:38" (1/1) ... [2020-10-20 00:55:38,916 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@59e14a65 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:38, skipping insertion in model container [2020-10-20 00:55:38,917 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.10 12:55:38" (1/1) ... [2020-10-20 00:55:38,927 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-20 00:55:38,951 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-20 00:55:39,207 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-20 00:55:39,219 INFO L203 MainTranslator]: Completed pre-run [2020-10-20 00:55:39,247 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-20 00:55:39,264 INFO L208 MainTranslator]: Completed translation [2020-10-20 00:55:39,264 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:39 WrapperNode [2020-10-20 00:55:39,265 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-20 00:55:39,266 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-10-20 00:55:39,266 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-10-20 00:55:39,266 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-10-20 00:55:39,274 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:39" (1/1) ... [2020-10-20 00:55:39,284 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:39" (1/1) ... [2020-10-20 00:55:39,306 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-10-20 00:55:39,306 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-20 00:55:39,307 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-20 00:55:39,307 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-20 00:55:39,315 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:39" (1/1) ... [2020-10-20 00:55:39,315 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:39" (1/1) ... [2020-10-20 00:55:39,319 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:39" (1/1) ... [2020-10-20 00:55:39,319 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:39" (1/1) ... [2020-10-20 00:55:39,331 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:39" (1/1) ... [2020-10-20 00:55:39,337 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:39" (1/1) ... [2020-10-20 00:55:39,340 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:39" (1/1) ... [2020-10-20 00:55:39,343 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-20 00:55:39,346 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-20 00:55:39,347 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-20 00:55:39,347 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-20 00:55:39,348 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:39" (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 [2020-10-20 00:55:39,418 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2020-10-20 00:55:39,419 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2020-10-20 00:55:39,419 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-20 00:55:39,419 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-20 00:55:39,419 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-20 00:55:39,420 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2020-10-20 00:55:39,420 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-20 00:55:39,772 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-20 00:55:39,773 INFO L298 CfgBuilder]: Removed 13 assume(true) statements. [2020-10-20 00:55:39,774 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 12:55:39 BoogieIcfgContainer [2020-10-20 00:55:39,775 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-20 00:55:39,776 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-20 00:55:39,776 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-20 00:55:39,779 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-20 00:55:39,780 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.10 12:55:38" (1/3) ... [2020-10-20 00:55:39,781 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50c10312 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.10 12:55:39, skipping insertion in model container [2020-10-20 00:55:39,781 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 12:55:39" (2/3) ... [2020-10-20 00:55:39,781 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50c10312 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.10 12:55:39, skipping insertion in model container [2020-10-20 00:55:39,781 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 12:55:39" (3/3) ... [2020-10-20 00:55:39,783 INFO L111 eAbstractionObserver]: Analyzing ICFG string-2.i [2020-10-20 00:55:39,797 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-10-20 00:55:39,804 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-20 00:55:39,821 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-20 00:55:39,848 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-20 00:55:39,848 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-20 00:55:39,848 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-10-20 00:55:39,849 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-20 00:55:39,849 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-20 00:55:39,849 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-20 00:55:39,849 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-20 00:55:39,849 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-20 00:55:39,864 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-10-20 00:55:39,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-10-20 00:55:39,870 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 00:55:39,871 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 00:55:39,871 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-20 00:55:39,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 00:55:39,877 INFO L82 PathProgramCache]: Analyzing trace with hash -610986519, now seen corresponding path program 1 times [2020-10-20 00:55:39,899 INFO L162 FreeRefinementEngine]: Executing refinement strategy WOLF [2020-10-20 00:55:39,900 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [749106641] [2020-10-20 00:55:39,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat Starting monitored process 2 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with mathsat -unsat_core_generation=3 [2020-10-20 00:55:39,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 00:55:39,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 1 conjunts are in the unsatisfiable core [2020-10-20 00:55:39,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 00:55:40,015 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 00:55:40,016 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-10-20 00:55:40,023 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 00:55:40,024 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [749106641] [2020-10-20 00:55:40,025 INFO L219 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2020-10-20 00:55:40,026 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2020-10-20 00:55:40,027 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1586888565] [2020-10-20 00:55:40,032 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-10-20 00:55:40,033 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2020-10-20 00:55:40,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-10-20 00:55:40,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-10-20 00:55:40,050 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 2 states. [2020-10-20 00:55:40,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 00:55:40,072 INFO L93 Difference]: Finished difference Result 53 states and 81 transitions. [2020-10-20 00:55:40,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-10-20 00:55:40,073 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 18 [2020-10-20 00:55:40,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-20 00:55:40,084 INFO L225 Difference]: With dead ends: 53 [2020-10-20 00:55:40,084 INFO L226 Difference]: Without dead ends: 24 [2020-10-20 00:55:40,088 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-10-20 00:55:40,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-10-20 00:55:40,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-10-20 00:55:40,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-10-20 00:55:40,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2020-10-20 00:55:40,121 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 18 [2020-10-20 00:55:40,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-20 00:55:40,121 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2020-10-20 00:55:40,121 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-10-20 00:55:40,122 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2020-10-20 00:55:40,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-10-20 00:55:40,123 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 00:55:40,123 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] [2020-10-20 00:55:40,335 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 mathsat -unsat_core_generation=3 [2020-10-20 00:55:40,335 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-20 00:55:40,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 00:55:40,336 INFO L82 PathProgramCache]: Analyzing trace with hash -2052613417, now seen corresponding path program 1 times [2020-10-20 00:55:40,338 INFO L162 FreeRefinementEngine]: Executing refinement strategy WOLF [2020-10-20 00:55:40,338 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1994925091] [2020-10-20 00:55:40,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat Starting monitored process 3 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with mathsat -unsat_core_generation=3 [2020-10-20 00:55:40,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 00:55:40,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 2 conjunts are in the unsatisfiable core [2020-10-20 00:55:40,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 00:55:40,463 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 00:55:40,463 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-10-20 00:55:40,476 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 00:55:40,477 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1994925091] [2020-10-20 00:55:40,477 INFO L219 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2020-10-20 00:55:40,477 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2020-10-20 00:55:40,477 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [648274493] [2020-10-20 00:55:40,479 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-10-20 00:55:40,479 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WOLF [2020-10-20 00:55:40,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-10-20 00:55:40,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-10-20 00:55:40,480 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand 4 states. [2020-10-20 00:55:40,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 00:55:40,605 INFO L93 Difference]: Finished difference Result 66 states and 81 transitions. [2020-10-20 00:55:40,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-10-20 00:55:40,606 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-10-20 00:55:40,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-20 00:55:40,610 INFO L225 Difference]: With dead ends: 66 [2020-10-20 00:55:40,610 INFO L226 Difference]: Without dead ends: 46 [2020-10-20 00:55:40,611 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-10-20 00:55:40,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-10-20 00:55:40,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 30. [2020-10-20 00:55:40,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-10-20 00:55:40,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 35 transitions. [2020-10-20 00:55:40,620 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 35 transitions. Word has length 20 [2020-10-20 00:55:40,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-20 00:55:40,621 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 35 transitions. [2020-10-20 00:55:40,621 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-10-20 00:55:40,621 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 35 transitions. [2020-10-20 00:55:40,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-10-20 00:55:40,622 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 00:55:40,623 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, 1, 1] [2020-10-20 00:55:40,836 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 mathsat -unsat_core_generation=3 [2020-10-20 00:55:40,836 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-20 00:55:40,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 00:55:40,837 INFO L82 PathProgramCache]: Analyzing trace with hash -326197737, now seen corresponding path program 1 times [2020-10-20 00:55:40,837 INFO L162 FreeRefinementEngine]: Executing refinement strategy WOLF [2020-10-20 00:55:40,838 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1225976977] [2020-10-20 00:55:40,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/mathsat Starting monitored process 4 with mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with mathsat -unsat_core_generation=3 [2020-10-20 00:55:40,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 00:55:40,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 4 conjunts are in the unsatisfiable core [2020-10-20 00:55:40,920 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 00:55:40,943 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-10-20 00:55:40,943 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-10-20 00:55:40,990 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1225976977] [2020-10-20 00:55:40,990 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: no int: (_ BitVec 32) [2020-10-20 00:55:40,991 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [913563120] [2020-10-20 00:55:40,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 5 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2020-10-20 00:55:41,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 00:55:41,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 4 conjunts are in the unsatisfiable core [2020-10-20 00:55:41,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 00:55:41,127 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-10-20 00:55:41,137 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-10-20 00:55:41,150 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: no int: (_ BitVec 32) [2020-10-20 00:55:41,151 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [455947081] [2020-10-20 00:55:41,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/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 [2020-10-20 00:55:41,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 00:55:41,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 8 conjunts are in the unsatisfiable core [2020-10-20 00:55:41,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-20 00:55:41,267 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2020-10-20 00:55:41,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-10-20 00:55:41,285 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: no int: (_ BitVec 32) [2020-10-20 00:55:41,286 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 0 imperfect interpolant sequences. [2020-10-20 00:55:41,286 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [] total 0 [2020-10-20 00:55:41,286 ERROR L205 FreeRefinementEngine]: Strategy WOLF failed to provide any proof altough trace is infeasible [2020-10-20 00:55:41,286 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-20 00:55:41,902 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 mathsat -unsat_core_generation=3,5 cvc4 --incremental --print-success --lang smt --rewrite-divk,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-20 00:55:41,921 WARN L238 ceAbstractionStarter]: Unable to decide correctness. Please check the following counterexample manually. [2020-10-20 00:55:41,922 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.10 12:55:41 BoogieIcfgContainer [2020-10-20 00:55:41,922 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-20 00:55:41,922 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-10-20 00:55:41,923 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-10-20 00:55:41,923 INFO L275 PluginConnector]: Witness Printer initialized [2020-10-20 00:55:41,926 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 12:55:39" (3/4) ... [2020-10-20 00:55:41,931 INFO L140 WitnessPrinter]: No result that supports witness generation found [2020-10-20 00:55:41,931 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-10-20 00:55:41,936 INFO L168 Benchmark]: Toolchain (without parser) took 3033.32 ms. Allocated memory was 41.9 MB in the beginning and 49.3 MB in the end (delta: 7.3 MB). Free memory was 20.8 MB in the beginning and 13.9 MB in the end (delta: 7.0 MB). Peak memory consumption was 14.3 MB. Max. memory is 14.3 GB. [2020-10-20 00:55:41,937 INFO L168 Benchmark]: CDTParser took 0.29 ms. Allocated memory is still 32.0 MB. Free memory was 9.0 MB in the beginning and 9.0 MB in the end (delta: 45.7 kB). Peak memory consumption was 45.7 kB. Max. memory is 14.3 GB. [2020-10-20 00:55:41,940 INFO L168 Benchmark]: CACSL2BoogieTranslator took 358.52 ms. Allocated memory was 41.9 MB in the beginning and 42.5 MB in the end (delta: 524.3 kB). Free memory was 19.9 MB in the beginning and 20.3 MB in the end (delta: -409.8 kB). Peak memory consumption was 11.4 MB. Max. memory is 14.3 GB. [2020-10-20 00:55:41,941 INFO L168 Benchmark]: Boogie Procedure Inliner took 40.56 ms. Allocated memory is still 42.5 MB. Free memory was 20.2 MB in the beginning and 18.3 MB in the end (delta: 1.9 MB). Peak memory consumption was 1.9 MB. Max. memory is 14.3 GB. [2020-10-20 00:55:41,943 INFO L168 Benchmark]: Boogie Preprocessor took 37.10 ms. Allocated memory is still 42.5 MB. Free memory was 18.3 MB in the beginning and 16.6 MB in the end (delta: 1.7 MB). Peak memory consumption was 1.7 MB. Max. memory is 14.3 GB. [2020-10-20 00:55:41,949 INFO L168 Benchmark]: RCFGBuilder took 428.46 ms. Allocated memory was 42.5 MB in the beginning and 45.1 MB in the end (delta: 2.6 MB). Free memory was 16.6 MB in the beginning and 16.3 MB in the end (delta: 249.1 kB). Peak memory consumption was 7.6 MB. Max. memory is 14.3 GB. [2020-10-20 00:55:41,950 INFO L168 Benchmark]: TraceAbstraction took 2146.06 ms. Allocated memory was 45.1 MB in the beginning and 49.3 MB in the end (delta: 4.2 MB). Free memory was 15.9 MB in the beginning and 14.3 MB in the end (delta: 1.6 MB). Peak memory consumption was 5.8 MB. Max. memory is 14.3 GB. [2020-10-20 00:55:41,951 INFO L168 Benchmark]: Witness Printer took 9.15 ms. Allocated memory is still 49.3 MB. Free memory was 14.3 MB in the beginning and 13.9 MB in the end (delta: 413.6 kB). Peak memory consumption was 413.6 kB. Max. memory is 14.3 GB. [2020-10-20 00:55:41,956 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.29 ms. Allocated memory is still 32.0 MB. Free memory was 9.0 MB in the beginning and 9.0 MB in the end (delta: 45.7 kB). Peak memory consumption was 45.7 kB. Max. memory is 14.3 GB. * CACSL2BoogieTranslator took 358.52 ms. Allocated memory was 41.9 MB in the beginning and 42.5 MB in the end (delta: 524.3 kB). Free memory was 19.9 MB in the beginning and 20.3 MB in the end (delta: -409.8 kB). Peak memory consumption was 11.4 MB. Max. memory is 14.3 GB. * Boogie Procedure Inliner took 40.56 ms. Allocated memory is still 42.5 MB. Free memory was 20.2 MB in the beginning and 18.3 MB in the end (delta: 1.9 MB). Peak memory consumption was 1.9 MB. Max. memory is 14.3 GB. * Boogie Preprocessor took 37.10 ms. Allocated memory is still 42.5 MB. Free memory was 18.3 MB in the beginning and 16.6 MB in the end (delta: 1.7 MB). Peak memory consumption was 1.7 MB. Max. memory is 14.3 GB. * RCFGBuilder took 428.46 ms. Allocated memory was 42.5 MB in the beginning and 45.1 MB in the end (delta: 2.6 MB). Free memory was 16.6 MB in the beginning and 16.3 MB in the end (delta: 249.1 kB). Peak memory consumption was 7.6 MB. Max. memory is 14.3 GB. * TraceAbstraction took 2146.06 ms. Allocated memory was 45.1 MB in the beginning and 49.3 MB in the end (delta: 4.2 MB). Free memory was 15.9 MB in the beginning and 14.3 MB in the end (delta: 1.6 MB). Peak memory consumption was 5.8 MB. Max. memory is 14.3 GB. * Witness Printer took 9.15 ms. Allocated memory is still 49.3 MB. Free memory was 14.3 MB in the beginning and 13.9 MB in the end (delta: 413.6 kB). Peak memory consumption was 413.6 kB. Max. memory is 14.3 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - UnprovableResult [Line: 12]: Unable to prove that call of __VERIFIER_error() unreachable Unable to prove that call of __VERIFIER_error() unreachable Reason: unable to decide satisfiability of path constraint. 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 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 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)<