./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursive-simple/id_i10_o10-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 54858612 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_1.5.800.v20200727-1323.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/recursive-simple/id_i10_o10-1.c -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 68fd8ffa149cd68eb012d97df5d4befaa28f95fa .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.0-5485861 [2020-10-25 23:11:54,061 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-25 23:11:54,063 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-25 23:11:54,133 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-25 23:11:54,134 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-25 23:11:54,140 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-25 23:11:54,142 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-25 23:11:54,149 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-25 23:11:54,152 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-25 23:11:54,159 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-25 23:11:54,160 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-25 23:11:54,165 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-25 23:11:54,165 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-25 23:11:54,169 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-25 23:11:54,170 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-25 23:11:54,172 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-25 23:11:54,173 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-25 23:11:54,177 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-25 23:11:54,180 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-25 23:11:54,188 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-25 23:11:54,190 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-25 23:11:54,191 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-25 23:11:54,194 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-25 23:11:54,195 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-25 23:11:54,198 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-25 23:11:54,203 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-25 23:11:54,203 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-25 23:11:54,205 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-25 23:11:54,205 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-25 23:11:54,208 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-25 23:11:54,208 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-25 23:11:54,210 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-25 23:11:54,211 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-25 23:11:54,212 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-25 23:11:54,213 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-25 23:11:54,213 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-25 23:11:54,214 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-25 23:11:54,214 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-25 23:11:54,214 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-25 23:11:54,216 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-25 23:11:54,217 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-25 23:11:54,218 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2020-10-25 23:11:54,246 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-25 23:11:54,246 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-25 23:11:54,247 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-25 23:11:54,248 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-25 23:11:54,248 INFO L138 SettingsManager]: * Use SBE=true [2020-10-25 23:11:54,248 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-25 23:11:54,248 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-25 23:11:54,249 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-25 23:11:54,249 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-25 23:11:54,249 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-25 23:11:54,249 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-25 23:11:54,249 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-25 23:11:54,250 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-25 23:11:54,250 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-25 23:11:54,250 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-25 23:11:54,250 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-25 23:11:54,250 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-25 23:11:54,251 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-25 23:11:54,251 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-25 23:11:54,251 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-25 23:11:54,251 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-25 23:11:54,251 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-25 23:11:54,252 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-25 23:11:54,252 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-25 23:11:54,252 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-25 23:11:54,252 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-25 23:11:54,252 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-25 23:11:54,253 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-25 23:11:54,253 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-25 23:11:54,253 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 68fd8ffa149cd68eb012d97df5d4befaa28f95fa [2020-10-25 23:11:54,680 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-25 23:11:54,723 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-25 23:11:54,729 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-25 23:11:54,731 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-25 23:11:54,732 INFO L275 PluginConnector]: CDTParser initialized [2020-10-25 23:11:54,733 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/id_i10_o10-1.c [2020-10-25 23:11:54,831 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ccb10672f/7d749010d41146119b111ee834e5cf59/FLAGec07cd83e [2020-10-25 23:11:55,445 INFO L306 CDTParser]: Found 1 translation units. [2020-10-25 23:11:55,447 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id_i10_o10-1.c [2020-10-25 23:11:55,455 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ccb10672f/7d749010d41146119b111ee834e5cf59/FLAGec07cd83e [2020-10-25 23:11:55,797 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ccb10672f/7d749010d41146119b111ee834e5cf59 [2020-10-25 23:11:55,801 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-25 23:11:55,808 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-10-25 23:11:55,810 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-25 23:11:55,811 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-25 23:11:55,815 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-25 23:11:55,816 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.10 11:11:55" (1/1) ... [2020-10-25 23:11:55,821 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@39500f3a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:55, skipping insertion in model container [2020-10-25 23:11:55,822 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.10 11:11:55" (1/1) ... [2020-10-25 23:11:55,831 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-25 23:11:55,845 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-25 23:11:56,008 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-25 23:11:56,019 INFO L203 MainTranslator]: Completed pre-run [2020-10-25 23:11:56,036 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-25 23:11:56,060 INFO L208 MainTranslator]: Completed translation [2020-10-25 23:11:56,060 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:56 WrapperNode [2020-10-25 23:11:56,061 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-25 23:11:56,062 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-10-25 23:11:56,062 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-10-25 23:11:56,063 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-10-25 23:11:56,071 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:56" (1/1) ... [2020-10-25 23:11:56,079 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:56" (1/1) ... [2020-10-25 23:11:56,096 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-10-25 23:11:56,097 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-25 23:11:56,097 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-25 23:11:56,097 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-25 23:11:56,106 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:56" (1/1) ... [2020-10-25 23:11:56,107 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:56" (1/1) ... [2020-10-25 23:11:56,108 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:56" (1/1) ... [2020-10-25 23:11:56,108 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:56" (1/1) ... [2020-10-25 23:11:56,112 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:56" (1/1) ... [2020-10-25 23:11:56,113 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:56" (1/1) ... [2020-10-25 23:11:56,114 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:56" (1/1) ... [2020-10-25 23:11:56,116 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-25 23:11:56,117 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-25 23:11:56,117 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-25 23:11:56,117 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-25 23:11:56,118 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:56" (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 [2020-10-25 23:11:56,190 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-25 23:11:56,190 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-25 23:11:56,190 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-25 23:11:56,191 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-10-25 23:11:56,191 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-10-25 23:11:56,191 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-25 23:11:56,387 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-25 23:11:56,387 INFO L298 CfgBuilder]: Removed 6 assume(true) statements. [2020-10-25 23:11:56,389 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.10 11:11:56 BoogieIcfgContainer [2020-10-25 23:11:56,389 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-25 23:11:56,391 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-25 23:11:56,391 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-25 23:11:56,395 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-25 23:11:56,395 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.10 11:11:55" (1/3) ... [2020-10-25 23:11:56,396 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44280e23 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.10 11:11:56, skipping insertion in model container [2020-10-25 23:11:56,396 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:56" (2/3) ... [2020-10-25 23:11:56,396 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@44280e23 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.10 11:11:56, skipping insertion in model container [2020-10-25 23:11:56,397 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.10 11:11:56" (3/3) ... [2020-10-25 23:11:56,398 INFO L111 eAbstractionObserver]: Analyzing ICFG id_i10_o10-1.c [2020-10-25 23:11:56,412 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-10-25 23:11:56,418 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-25 23:11:56,435 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-25 23:11:56,465 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-25 23:11:56,466 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-25 23:11:56,466 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-10-25 23:11:56,466 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-25 23:11:56,466 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-25 23:11:56,466 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-25 23:11:56,466 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-25 23:11:56,466 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-25 23:11:56,486 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-10-25 23:11:56,493 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-10-25 23:11:56,493 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 23:11:56,494 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 23:11:56,494 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 23:11:56,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 23:11:56,502 INFO L82 PathProgramCache]: Analyzing trace with hash 666808458, now seen corresponding path program 1 times [2020-10-25 23:11:56,515 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 23:11:56,515 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1012008580] [2020-10-25 23:11:56,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 23:11:56,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:56,840 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:56,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:56,900 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-25 23:11:56,901 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1012008580] [2020-10-25 23:11:56,902 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-25 23:11:56,903 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-10-25 23:11:56,904 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [829457475] [2020-10-25 23:11:56,910 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-25 23:11:56,910 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 23:11:56,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-25 23:11:56,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-10-25 23:11:56,931 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 5 states. [2020-10-25 23:11:56,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 23:11:56,992 INFO L93 Difference]: Finished difference Result 29 states and 31 transitions. [2020-10-25 23:11:56,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-25 23:11:56,994 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-10-25 23:11:56,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 23:11:57,005 INFO L225 Difference]: With dead ends: 29 [2020-10-25 23:11:57,006 INFO L226 Difference]: Without dead ends: 15 [2020-10-25 23:11:57,009 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-10-25 23:11:57,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-10-25 23:11:57,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-10-25 23:11:57,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-10-25 23:11:57,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-10-25 23:11:57,057 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 10 [2020-10-25 23:11:57,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 23:11:57,058 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-10-25 23:11:57,058 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-25 23:11:57,058 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-10-25 23:11:57,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-10-25 23:11:57,060 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 23:11:57,060 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 23:11:57,061 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-25 23:11:57,061 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 23:11:57,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 23:11:57,062 INFO L82 PathProgramCache]: Analyzing trace with hash 1352629460, now seen corresponding path program 1 times [2020-10-25 23:11:57,063 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 23:11:57,063 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1719759672] [2020-10-25 23:11:57,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 23:11:57,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:57,109 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:57,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:57,146 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:57,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:57,172 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-25 23:11:57,172 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1719759672] [2020-10-25 23:11:57,172 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [74235520] [2020-10-25 23:11:57,173 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 [2020-10-25 23:11:57,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:57,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 6 conjunts are in the unsatisfiable core [2020-10-25 23:11:57,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-25 23:11:57,346 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-25 23:11:57,347 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-25 23:11:57,347 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-10-25 23:11:57,348 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [4949977] [2020-10-25 23:11:57,349 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-25 23:11:57,349 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 23:11:57,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-25 23:11:57,351 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-10-25 23:11:57,351 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 8 states. [2020-10-25 23:11:57,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 23:11:57,417 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2020-10-25 23:11:57,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-25 23:11:57,418 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 16 [2020-10-25 23:11:57,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 23:11:57,419 INFO L225 Difference]: With dead ends: 22 [2020-10-25 23:11:57,419 INFO L226 Difference]: Without dead ends: 18 [2020-10-25 23:11:57,420 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2020-10-25 23:11:57,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-10-25 23:11:57,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-10-25 23:11:57,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-10-25 23:11:57,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-10-25 23:11:57,427 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 16 [2020-10-25 23:11:57,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 23:11:57,427 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-10-25 23:11:57,428 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-25 23:11:57,428 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-10-25 23:11:57,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-10-25 23:11:57,429 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 23:11:57,429 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 23:11:57,643 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-10-25 23:11:57,645 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 23:11:57,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 23:11:57,646 INFO L82 PathProgramCache]: Analyzing trace with hash 832070858, now seen corresponding path program 2 times [2020-10-25 23:11:57,647 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 23:11:57,647 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1390439144] [2020-10-25 23:11:57,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 23:11:57,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:57,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:57,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:57,788 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:57,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:57,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:57,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:57,873 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-10-25 23:11:57,874 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1390439144] [2020-10-25 23:11:57,874 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1779948632] [2020-10-25 23:11:57,875 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 [2020-10-25 23:11:57,939 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-10-25 23:11:57,940 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-25 23:11:57,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 8 conjunts are in the unsatisfiable core [2020-10-25 23:11:57,945 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-25 23:11:58,077 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-10-25 23:11:58,078 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-25 23:11:58,078 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-10-25 23:11:58,079 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359960223] [2020-10-25 23:11:58,080 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-10-25 23:11:58,081 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 23:11:58,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-10-25 23:11:58,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-10-25 23:11:58,085 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 9 states. [2020-10-25 23:11:58,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 23:11:58,166 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-10-25 23:11:58,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-25 23:11:58,167 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 22 [2020-10-25 23:11:58,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 23:11:58,168 INFO L225 Difference]: With dead ends: 25 [2020-10-25 23:11:58,168 INFO L226 Difference]: Without dead ends: 21 [2020-10-25 23:11:58,169 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2020-10-25 23:11:58,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-10-25 23:11:58,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-10-25 23:11:58,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-10-25 23:11:58,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-10-25 23:11:58,177 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 22 [2020-10-25 23:11:58,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 23:11:58,178 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-10-25 23:11:58,178 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-10-25 23:11:58,178 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-10-25 23:11:58,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-10-25 23:11:58,179 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 23:11:58,180 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 23:11:58,393 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-25 23:11:58,394 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 23:11:58,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 23:11:58,395 INFO L82 PathProgramCache]: Analyzing trace with hash 1547641236, now seen corresponding path program 3 times [2020-10-25 23:11:58,396 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 23:11:58,397 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1416712924] [2020-10-25 23:11:58,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 23:11:58,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:58,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:58,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:58,478 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:58,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:58,503 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:58,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:58,526 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:58,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:58,548 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-10-25 23:11:58,549 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1416712924] [2020-10-25 23:11:58,549 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [104359086] [2020-10-25 23:11:58,549 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 [2020-10-25 23:11:58,594 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-10-25 23:11:58,594 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-25 23:11:58,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 10 conjunts are in the unsatisfiable core [2020-10-25 23:11:58,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-25 23:11:58,735 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-10-25 23:11:58,736 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-25 23:11:58,736 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 17 [2020-10-25 23:11:58,736 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016359268] [2020-10-25 23:11:58,737 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-10-25 23:11:58,737 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 23:11:58,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-10-25 23:11:58,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=226, Unknown=0, NotChecked=0, Total=272 [2020-10-25 23:11:58,738 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 17 states. [2020-10-25 23:11:59,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 23:11:59,008 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-10-25 23:11:59,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-10-25 23:11:59,009 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 28 [2020-10-25 23:11:59,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 23:11:59,010 INFO L225 Difference]: With dead ends: 28 [2020-10-25 23:11:59,011 INFO L226 Difference]: Without dead ends: 24 [2020-10-25 23:11:59,012 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=444, Unknown=0, NotChecked=0, Total=552 [2020-10-25 23:11:59,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-10-25 23:11:59,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-10-25 23:11:59,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-10-25 23:11:59,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-10-25 23:11:59,019 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 28 [2020-10-25 23:11:59,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 23:11:59,020 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-10-25 23:11:59,020 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-10-25 23:11:59,021 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-10-25 23:11:59,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-10-25 23:11:59,022 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 23:11:59,022 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 23:11:59,236 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-25 23:11:59,237 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 23:11:59,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 23:11:59,238 INFO L82 PathProgramCache]: Analyzing trace with hash -346978038, now seen corresponding path program 4 times [2020-10-25 23:11:59,238 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 23:11:59,239 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [589844605] [2020-10-25 23:11:59,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 23:11:59,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:59,282 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:59,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:59,317 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:59,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:59,346 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:59,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:59,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:59,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:59,396 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:59,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:59,428 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-10-25 23:11:59,428 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [589844605] [2020-10-25 23:11:59,428 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [248270862] [2020-10-25 23:11:59,429 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 [2020-10-25 23:11:59,476 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-10-25 23:11:59,477 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-25 23:11:59,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 12 conjunts are in the unsatisfiable core [2020-10-25 23:11:59,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-25 23:11:59,551 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-10-25 23:11:59,552 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-25 23:11:59,552 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 11 [2020-10-25 23:11:59,552 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1323301884] [2020-10-25 23:11:59,553 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-10-25 23:11:59,553 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 23:11:59,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-10-25 23:11:59,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2020-10-25 23:11:59,554 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 11 states. [2020-10-25 23:11:59,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 23:11:59,660 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-10-25 23:11:59,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-25 23:11:59,662 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 34 [2020-10-25 23:11:59,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 23:11:59,664 INFO L225 Difference]: With dead ends: 31 [2020-10-25 23:11:59,664 INFO L226 Difference]: Without dead ends: 27 [2020-10-25 23:11:59,665 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=81, Invalid=159, Unknown=0, NotChecked=0, Total=240 [2020-10-25 23:11:59,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-10-25 23:11:59,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-10-25 23:11:59,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-10-25 23:11:59,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-10-25 23:11:59,673 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 34 [2020-10-25 23:11:59,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 23:11:59,674 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-10-25 23:11:59,674 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-10-25 23:11:59,674 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-10-25 23:11:59,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-10-25 23:11:59,676 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 23:11:59,676 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 23:11:59,890 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-25 23:11:59,891 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 23:11:59,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 23:11:59,892 INFO L82 PathProgramCache]: Analyzing trace with hash -1234184620, now seen corresponding path program 5 times [2020-10-25 23:11:59,893 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 23:11:59,893 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1536269779] [2020-10-25 23:11:59,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 23:11:59,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:59,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:59,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:59,994 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:00,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:00,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:00,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:00,093 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:00,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:00,117 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:00,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:00,139 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:00,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:00,198 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-10-25 23:12:00,199 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1536269779] [2020-10-25 23:12:00,199 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1283158106] [2020-10-25 23:12:00,200 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 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 [2020-10-25 23:12:00,253 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2020-10-25 23:12:00,254 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-25 23:12:00,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 14 conjunts are in the unsatisfiable core [2020-10-25 23:12:00,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-25 23:12:00,330 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-10-25 23:12:00,331 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-25 23:12:00,331 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 12 [2020-10-25 23:12:00,331 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1078085752] [2020-10-25 23:12:00,332 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-10-25 23:12:00,332 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 23:12:00,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-10-25 23:12:00,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=89, Unknown=0, NotChecked=0, Total=132 [2020-10-25 23:12:00,333 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 12 states. [2020-10-25 23:12:00,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 23:12:00,467 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-10-25 23:12:00,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-25 23:12:00,469 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-10-25 23:12:00,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 23:12:00,470 INFO L225 Difference]: With dead ends: 34 [2020-10-25 23:12:00,470 INFO L226 Difference]: Without dead ends: 30 [2020-10-25 23:12:00,471 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2020-10-25 23:12:00,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-10-25 23:12:00,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-10-25 23:12:00,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-10-25 23:12:00,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-10-25 23:12:00,484 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 40 [2020-10-25 23:12:00,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 23:12:00,485 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-10-25 23:12:00,485 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-10-25 23:12:00,485 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-10-25 23:12:00,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-10-25 23:12:00,487 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 23:12:00,487 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 23:12:00,700 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-10-25 23:12:00,701 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 23:12:00,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 23:12:00,702 INFO L82 PathProgramCache]: Analyzing trace with hash 1831214410, now seen corresponding path program 6 times [2020-10-25 23:12:00,702 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 23:12:00,703 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1883715923] [2020-10-25 23:12:00,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 23:12:00,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:00,741 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:00,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:00,773 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:00,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:00,798 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:00,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:00,831 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:00,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:00,859 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:00,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:00,904 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:00,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:00,927 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:00,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:00,954 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-10-25 23:12:00,954 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1883715923] [2020-10-25 23:12:00,954 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1312091719] [2020-10-25 23:12:00,955 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-25 23:12:01,011 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-10-25 23:12:01,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-25 23:12:01,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 16 conjunts are in the unsatisfiable core [2020-10-25 23:12:01,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-25 23:12:01,386 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-10-25 23:12:01,387 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-25 23:12:01,387 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 26 [2020-10-25 23:12:01,387 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793275281] [2020-10-25 23:12:01,388 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-10-25 23:12:01,388 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 23:12:01,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-10-25 23:12:01,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=544, Unknown=0, NotChecked=0, Total=650 [2020-10-25 23:12:01,389 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 26 states. [2020-10-25 23:12:01,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 23:12:01,857 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2020-10-25 23:12:01,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-10-25 23:12:01,858 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 46 [2020-10-25 23:12:01,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 23:12:01,860 INFO L225 Difference]: With dead ends: 37 [2020-10-25 23:12:01,860 INFO L226 Difference]: Without dead ends: 33 [2020-10-25 23:12:01,862 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 250 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=279, Invalid=1203, Unknown=0, NotChecked=0, Total=1482 [2020-10-25 23:12:01,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-10-25 23:12:01,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-10-25 23:12:01,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-10-25 23:12:01,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-10-25 23:12:01,871 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 46 [2020-10-25 23:12:01,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 23:12:01,871 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-10-25 23:12:01,871 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-10-25 23:12:01,872 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-10-25 23:12:01,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-10-25 23:12:01,873 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 23:12:01,873 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 23:12:02,084 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-25 23:12:02,085 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 23:12:02,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 23:12:02,086 INFO L82 PathProgramCache]: Analyzing trace with hash 1739954964, now seen corresponding path program 7 times [2020-10-25 23:12:02,087 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 23:12:02,087 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [994564529] [2020-10-25 23:12:02,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 23:12:02,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:02,124 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:02,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:02,189 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:02,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:02,210 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:02,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:02,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:02,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:02,257 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:02,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:02,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:02,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:02,342 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:02,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:02,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:02,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:02,407 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-10-25 23:12:02,408 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [994564529] [2020-10-25 23:12:02,408 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2104783701] [2020-10-25 23:12:02,408 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-25 23:12:02,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:02,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 18 conjunts are in the unsatisfiable core [2020-10-25 23:12:02,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-25 23:12:02,575 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-10-25 23:12:02,575 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-25 23:12:02,576 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 14 [2020-10-25 23:12:02,576 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674904709] [2020-10-25 23:12:02,576 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-10-25 23:12:02,577 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 23:12:02,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-10-25 23:12:02,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=120, Unknown=0, NotChecked=0, Total=182 [2020-10-25 23:12:02,578 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 14 states. [2020-10-25 23:12:02,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 23:12:02,749 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2020-10-25 23:12:02,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-10-25 23:12:02,750 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 52 [2020-10-25 23:12:02,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 23:12:02,752 INFO L225 Difference]: With dead ends: 40 [2020-10-25 23:12:02,752 INFO L226 Difference]: Without dead ends: 36 [2020-10-25 23:12:02,753 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=159, Invalid=303, Unknown=0, NotChecked=0, Total=462 [2020-10-25 23:12:02,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-10-25 23:12:02,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-10-25 23:12:02,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-10-25 23:12:02,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-10-25 23:12:02,760 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 52 [2020-10-25 23:12:02,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 23:12:02,761 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-10-25 23:12:02,761 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-10-25 23:12:02,761 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-10-25 23:12:02,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-10-25 23:12:02,763 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 23:12:02,763 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 23:12:02,977 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-25 23:12:02,978 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 23:12:02,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 23:12:02,979 INFO L82 PathProgramCache]: Analyzing trace with hash -632151670, now seen corresponding path program 8 times [2020-10-25 23:12:02,980 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 23:12:02,980 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [732340609] [2020-10-25 23:12:02,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 23:12:02,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:03,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:03,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:03,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:03,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:03,085 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:03,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:03,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:03,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:03,151 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:03,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:03,178 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:03,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:03,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:03,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:03,223 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:03,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:03,245 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:03,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:03,283 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-10-25 23:12:03,284 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [732340609] [2020-10-25 23:12:03,284 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1664813939] [2020-10-25 23:12:03,284 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-25 23:12:03,335 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-10-25 23:12:03,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-25 23:12:03,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 20 conjunts are in the unsatisfiable core [2020-10-25 23:12:03,340 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-25 23:12:03,429 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-10-25 23:12:03,429 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-25 23:12:03,429 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 15 [2020-10-25 23:12:03,430 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [594173340] [2020-10-25 23:12:03,430 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-10-25 23:12:03,430 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 23:12:03,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-10-25 23:12:03,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=137, Unknown=0, NotChecked=0, Total=210 [2020-10-25 23:12:03,431 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 15 states. [2020-10-25 23:12:03,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 23:12:03,607 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2020-10-25 23:12:03,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-10-25 23:12:03,607 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 58 [2020-10-25 23:12:03,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 23:12:03,610 INFO L225 Difference]: With dead ends: 43 [2020-10-25 23:12:03,610 INFO L226 Difference]: Without dead ends: 39 [2020-10-25 23:12:03,611 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=191, Invalid=361, Unknown=0, NotChecked=0, Total=552 [2020-10-25 23:12:03,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-10-25 23:12:03,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-10-25 23:12:03,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-10-25 23:12:03,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-10-25 23:12:03,618 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 58 [2020-10-25 23:12:03,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 23:12:03,618 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-10-25 23:12:03,618 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-10-25 23:12:03,619 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-10-25 23:12:03,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-10-25 23:12:03,620 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 23:12:03,620 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 23:12:03,834 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-10-25 23:12:03,835 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 23:12:03,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 23:12:03,837 INFO L82 PathProgramCache]: Analyzing trace with hash 764702676, now seen corresponding path program 9 times [2020-10-25 23:12:03,838 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 23:12:03,838 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [937980457] [2020-10-25 23:12:03,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 23:12:03,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:03,867 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:03,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:03,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:03,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:03,923 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:03,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:03,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:03,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:03,973 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:03,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:04,000 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:04,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:04,025 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:04,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:04,050 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:04,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:04,073 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:04,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:04,115 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:12:04,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:12:04,165 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-10-25 23:12:04,165 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [937980457] [2020-10-25 23:12:04,165 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [961216280] [2020-10-25 23:12:04,166 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 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-25 23:12:04,232 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2020-10-25 23:12:04,233 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-25 23:12:04,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 22 conjunts are in the unsatisfiable core [2020-10-25 23:12:04,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-25 23:12:04,762 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-10-25 23:12:04,763 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-25 23:12:04,763 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 35 [2020-10-25 23:12:04,763 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085372918] [2020-10-25 23:12:04,766 INFO L461 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-10-25 23:12:04,766 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 23:12:04,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-10-25 23:12:04,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=997, Unknown=0, NotChecked=0, Total=1190 [2020-10-25 23:12:04,768 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 35 states. [2020-10-25 23:12:05,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 23:12:05,409 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2020-10-25 23:12:05,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-10-25 23:12:05,410 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 64 [2020-10-25 23:12:05,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 23:12:05,411 INFO L225 Difference]: With dead ends: 46 [2020-10-25 23:12:05,412 INFO L226 Difference]: Without dead ends: 42 [2020-10-25 23:12:05,418 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 538 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=531, Invalid=2331, Unknown=0, NotChecked=0, Total=2862 [2020-10-25 23:12:05,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-10-25 23:12:05,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-10-25 23:12:05,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-10-25 23:12:05,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-10-25 23:12:05,433 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 64 [2020-10-25 23:12:05,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 23:12:05,434 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-10-25 23:12:05,434 INFO L482 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-10-25 23:12:05,434 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-10-25 23:12:05,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-10-25 23:12:05,440 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 23:12:05,440 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 23:12:05,653 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-25 23:12:05,654 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 23:12:05,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 23:12:05,655 INFO L82 PathProgramCache]: Analyzing trace with hash 554800586, now seen corresponding path program 10 times [2020-10-25 23:12:05,656 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 23:12:05,656 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [487878976] [2020-10-25 23:12:05,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 23:12:05,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-25 23:12:05,679 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-25 23:12:05,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-25 23:12:05,699 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-25 23:12:05,727 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-25 23:12:05,727 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-25 23:12:05,728 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-10-25 23:12:05,791 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.10 11:12:05 BoogieIcfgContainer [2020-10-25 23:12:05,791 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-25 23:12:05,792 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-10-25 23:12:05,792 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-10-25 23:12:05,793 INFO L275 PluginConnector]: Witness Printer initialized [2020-10-25 23:12:05,793 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.10 11:11:56" (3/4) ... [2020-10-25 23:12:05,796 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-10-25 23:12:05,875 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2020-10-25 23:12:05,875 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-10-25 23:12:05,877 INFO L168 Benchmark]: Toolchain (without parser) took 10073.41 ms. Allocated memory was 62.9 MB in the beginning and 134.2 MB in the end (delta: 71.3 MB). Free memory was 39.8 MB in the beginning and 93.2 MB in the end (delta: -53.4 MB). Peak memory consumption was 19.1 MB. Max. memory is 16.1 GB. [2020-10-25 23:12:05,878 INFO L168 Benchmark]: CDTParser took 0.31 ms. Allocated memory is still 41.9 MB. Free memory was 23.7 MB in the beginning and 23.6 MB in the end (delta: 30.4 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-10-25 23:12:05,878 INFO L168 Benchmark]: CACSL2BoogieTranslator took 250.61 ms. Allocated memory is still 62.9 MB. Free memory was 39.2 MB in the beginning and 47.2 MB in the end (delta: -8.0 MB). Peak memory consumption was 14.2 MB. Max. memory is 16.1 GB. [2020-10-25 23:12:05,879 INFO L168 Benchmark]: Boogie Procedure Inliner took 34.12 ms. Allocated memory is still 62.9 MB. Free memory was 47.2 MB in the beginning and 46.1 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-10-25 23:12:05,880 INFO L168 Benchmark]: Boogie Preprocessor took 19.27 ms. Allocated memory is still 62.9 MB. Free memory was 45.8 MB in the beginning and 45.0 MB in the end (delta: 802.6 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-10-25 23:12:05,880 INFO L168 Benchmark]: RCFGBuilder took 272.32 ms. Allocated memory is still 62.9 MB. Free memory was 45.0 MB in the beginning and 34.6 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-10-25 23:12:05,881 INFO L168 Benchmark]: TraceAbstraction took 9400.82 ms. Allocated memory was 62.9 MB in the beginning and 134.2 MB in the end (delta: 71.3 MB). Free memory was 34.1 MB in the beginning and 96.4 MB in the end (delta: -62.2 MB). Peak memory consumption was 9.1 MB. Max. memory is 16.1 GB. [2020-10-25 23:12:05,881 INFO L168 Benchmark]: Witness Printer took 82.88 ms. Allocated memory is still 134.2 MB. Free memory was 96.4 MB in the beginning and 93.2 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-10-25 23:12:05,885 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.31 ms. Allocated memory is still 41.9 MB. Free memory was 23.7 MB in the beginning and 23.6 MB in the end (delta: 30.4 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 250.61 ms. Allocated memory is still 62.9 MB. Free memory was 39.2 MB in the beginning and 47.2 MB in the end (delta: -8.0 MB). Peak memory consumption was 14.2 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 34.12 ms. Allocated memory is still 62.9 MB. Free memory was 47.2 MB in the beginning and 46.1 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 19.27 ms. Allocated memory is still 62.9 MB. Free memory was 45.8 MB in the beginning and 45.0 MB in the end (delta: 802.6 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 272.32 ms. Allocated memory is still 62.9 MB. Free memory was 45.0 MB in the beginning and 34.6 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 9400.82 ms. Allocated memory was 62.9 MB in the beginning and 134.2 MB in the end (delta: 71.3 MB). Free memory was 34.1 MB in the beginning and 96.4 MB in the end (delta: -62.2 MB). Peak memory consumption was 9.1 MB. Max. memory is 16.1 GB. * Witness Printer took 82.88 ms. Allocated memory is still 134.2 MB. Free memory was 96.4 MB in the beginning and 93.2 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 4]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int input = 10; [L13] CALL, EXPR id(input) VAL [\old(x)=10] [L7] COND FALSE !(x==0) VAL [\old(x)=10, x=10] [L8] CALL, EXPR id(x-1) VAL [\old(x)=9] [L7] COND FALSE !(x==0) VAL [\old(x)=9, x=9] [L8] CALL, EXPR id(x-1) VAL [\old(x)=8] [L7] COND FALSE !(x==0) VAL [\old(x)=8, x=8] [L8] CALL, EXPR id(x-1) VAL [\old(x)=7] [L7] COND FALSE !(x==0) VAL [\old(x)=7, x=7] [L8] CALL, EXPR id(x-1) VAL [\old(x)=6] [L7] COND FALSE !(x==0) VAL [\old(x)=6, x=6] [L8] CALL, EXPR id(x-1) VAL [\old(x)=5] [L7] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L8] CALL, EXPR id(x-1) VAL [\old(x)=4] [L7] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L8] CALL, EXPR id(x-1) VAL [\old(x)=3] [L7] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L8] CALL, EXPR id(x-1) VAL [\old(x)=2] [L7] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L8] CALL, EXPR id(x-1) VAL [\old(x)=1] [L7] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L8] CALL, EXPR id(x-1) VAL [\old(x)=0] [L7] COND TRUE x==0 [L7] return 0; VAL [\old(x)=0, \result=0, x=0] [L8] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=3, id(x-1)=2, x=3] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=5, id(x-1)=4, x=5] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=6, id(x-1)=5, x=6] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=7, id(x-1)=6, x=7] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=8, id(x-1)=7, x=8] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=9, id(x-1)=8, x=9] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=10, id(x-1)=9, x=10] [L8] return id(x-1) + 1; [L13] RET, EXPR id(input) [L13] int result = id(input); [L14] COND TRUE result == 10 [L4] __assert_fail("0", "id_i10_o10-1.c", 4, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 17 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 9.2s, OverallIterations: 11, TraceHistogramMax: 11, AutomataDifference: 2.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 102 SDtfs, 198 SDslu, 543 SDs, 0 SdLazy, 483 SolverSat, 74 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 619 GetRequests, 415 SyntacticMatches, 0 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1071 ImplicationChecksByTransitivity, 3.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=42occurred in iteration=10, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 10 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 3.8s InterpolantComputationTime, 800 NumberOfCodeBlocks, 794 NumberOfCodeBlocksAsserted, 45 NumberOfCheckSat, 711 ConstructedInterpolants, 0 QuantifiedInterpolants, 76095 SizeOfPredicates, 42 NumberOfNonLiveVariables, 1058 ConjunctsInSsa, 126 ConjunctsInUnsatCore, 19 InterpolantComputations, 1 PerfectInterpolantSequences, 900/1800 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...