./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursive-simple/id2_i5_o5-1.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/id2_i5_o5-1.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 990c50250359c7452ab1ceec7da37e6f04bc6511 ....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 23:11:44,646 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-25 23:11:44,650 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-25 23:11:44,685 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-25 23:11:44,686 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-25 23:11:44,688 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-25 23:11:44,690 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-25 23:11:44,692 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-25 23:11:44,695 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-25 23:11:44,696 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-25 23:11:44,698 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-25 23:11:44,700 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-25 23:11:44,701 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-25 23:11:44,703 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-25 23:11:44,704 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-25 23:11:44,706 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-25 23:11:44,708 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-25 23:11:44,709 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-25 23:11:44,712 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-25 23:11:44,715 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-25 23:11:44,717 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-25 23:11:44,719 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-25 23:11:44,721 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-25 23:11:44,722 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-25 23:11:44,726 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-25 23:11:44,727 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-25 23:11:44,727 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-25 23:11:44,729 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-25 23:11:44,729 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-25 23:11:44,731 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-25 23:11:44,731 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-25 23:11:44,733 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-25 23:11:44,734 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-25 23:11:44,735 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-25 23:11:44,736 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-25 23:11:44,753 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-25 23:11:44,754 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-25 23:11:44,756 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-25 23:11:44,757 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-25 23:11:44,758 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-25 23:11:44,761 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-25 23:11:44,766 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2020-10-25 23:11:44,822 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-25 23:11:44,822 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-25 23:11:44,827 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-25 23:11:44,828 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-25 23:11:44,828 INFO L138 SettingsManager]: * Use SBE=true [2020-10-25 23:11:44,829 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-25 23:11:44,829 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-25 23:11:44,829 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-25 23:11:44,830 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-25 23:11:44,830 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-25 23:11:44,832 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-25 23:11:44,832 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-25 23:11:44,833 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-25 23:11:44,833 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-25 23:11:44,833 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-25 23:11:44,834 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-25 23:11:44,834 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-25 23:11:44,834 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-25 23:11:44,835 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-25 23:11:44,835 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-25 23:11:44,835 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-25 23:11:44,836 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-25 23:11:44,836 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-25 23:11:44,836 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-25 23:11:44,837 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-25 23:11:44,837 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-25 23:11:44,838 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-25 23:11:44,838 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-25 23:11:44,838 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-25 23:11:44,839 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 990c50250359c7452ab1ceec7da37e6f04bc6511 [2020-10-25 23:11:45,306 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-25 23:11:45,342 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-25 23:11:45,346 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-25 23:11:45,347 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-25 23:11:45,349 INFO L275 PluginConnector]: CDTParser initialized [2020-10-25 23:11:45,350 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/id2_i5_o5-1.c [2020-10-25 23:11:45,450 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fec7b70c9/cc9502d433814038ad0b2fd952d33046/FLAG1b61e0c27 [2020-10-25 23:11:46,090 INFO L306 CDTParser]: Found 1 translation units. [2020-10-25 23:11:46,091 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id2_i5_o5-1.c [2020-10-25 23:11:46,100 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fec7b70c9/cc9502d433814038ad0b2fd952d33046/FLAG1b61e0c27 [2020-10-25 23:11:46,496 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/fec7b70c9/cc9502d433814038ad0b2fd952d33046 [2020-10-25 23:11:46,503 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-25 23:11:46,512 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-10-25 23:11:46,515 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-25 23:11:46,515 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-25 23:11:46,520 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-25 23:11:46,521 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.10 11:11:46" (1/1) ... [2020-10-25 23:11:46,528 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@122beb3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:46, skipping insertion in model container [2020-10-25 23:11:46,528 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.10 11:11:46" (1/1) ... [2020-10-25 23:11:46,540 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-25 23:11:46,562 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-25 23:11:46,900 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-25 23:11:46,916 INFO L203 MainTranslator]: Completed pre-run [2020-10-25 23:11:46,940 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-25 23:11:46,964 INFO L208 MainTranslator]: Completed translation [2020-10-25 23:11:46,965 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:46 WrapperNode [2020-10-25 23:11:46,966 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-25 23:11:46,970 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-10-25 23:11:46,970 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-10-25 23:11:46,970 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-10-25 23:11:46,982 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:46" (1/1) ... [2020-10-25 23:11:46,996 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:46" (1/1) ... [2020-10-25 23:11:47,021 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-10-25 23:11:47,024 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-25 23:11:47,025 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-25 23:11:47,025 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-25 23:11:47,038 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:46" (1/1) ... [2020-10-25 23:11:47,039 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:46" (1/1) ... [2020-10-25 23:11:47,053 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:46" (1/1) ... [2020-10-25 23:11:47,053 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:46" (1/1) ... [2020-10-25 23:11:47,065 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:46" (1/1) ... [2020-10-25 23:11:47,069 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:46" (1/1) ... [2020-10-25 23:11:47,070 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:46" (1/1) ... [2020-10-25 23:11:47,079 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-25 23:11:47,081 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-25 23:11:47,081 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-25 23:11:47,081 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-25 23:11:47,083 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:46" (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 23:11:47,200 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-25 23:11:47,201 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-25 23:11:47,202 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-10-25 23:11:47,203 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-10-25 23:11:47,203 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-25 23:11:47,203 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-25 23:11:47,203 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-10-25 23:11:47,204 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-10-25 23:11:47,592 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-25 23:11:47,593 INFO L298 CfgBuilder]: Removed 6 assume(true) statements. [2020-10-25 23:11:47,596 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.10 11:11:47 BoogieIcfgContainer [2020-10-25 23:11:47,597 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-25 23:11:47,600 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-25 23:11:47,600 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-25 23:11:47,605 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-25 23:11:47,606 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.10 11:11:46" (1/3) ... [2020-10-25 23:11:47,607 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@644339ff and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.10 11:11:47, skipping insertion in model container [2020-10-25 23:11:47,607 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.10 11:11:46" (2/3) ... [2020-10-25 23:11:47,608 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@644339ff and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.10 11:11:47, skipping insertion in model container [2020-10-25 23:11:47,608 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.10 11:11:47" (3/3) ... [2020-10-25 23:11:47,611 INFO L111 eAbstractionObserver]: Analyzing ICFG id2_i5_o5-1.c [2020-10-25 23:11:47,628 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-10-25 23:11:47,634 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-25 23:11:47,652 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-25 23:11:47,699 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-25 23:11:47,699 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-25 23:11:47,700 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-10-25 23:11:47,700 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-25 23:11:47,700 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-25 23:11:47,700 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-25 23:11:47,700 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-25 23:11:47,701 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-25 23:11:47,720 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2020-10-25 23:11:47,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-10-25 23:11:47,727 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 23:11:47,728 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 23:11:47,729 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 23:11:47,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 23:11:47,738 INFO L82 PathProgramCache]: Analyzing trace with hash 809990150, now seen corresponding path program 1 times [2020-10-25 23:11:47,752 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 23:11:47,753 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [618566637] [2020-10-25 23:11:47,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 23:11:47,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:47,996 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:48,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:48,058 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 23:11:48,059 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [618566637] [2020-10-25 23:11:48,060 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-25 23:11:48,061 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-10-25 23:11:48,062 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523172448] [2020-10-25 23:11:48,069 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-10-25 23:11:48,070 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 23:11:48,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-10-25 23:11:48,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-10-25 23:11:48,096 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 5 states. [2020-10-25 23:11:48,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 23:11:48,151 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2020-10-25 23:11:48,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-10-25 23:11:48,153 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-10-25 23:11:48,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 23:11:48,163 INFO L225 Difference]: With dead ends: 35 [2020-10-25 23:11:48,163 INFO L226 Difference]: Without dead ends: 21 [2020-10-25 23:11:48,167 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-10-25 23:11:48,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-10-25 23:11:48,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-10-25 23:11:48,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-10-25 23:11:48,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-10-25 23:11:48,215 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 10 [2020-10-25 23:11:48,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 23:11:48,215 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-10-25 23:11:48,216 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-10-25 23:11:48,216 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-10-25 23:11:48,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-10-25 23:11:48,218 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 23:11:48,218 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 23:11:48,218 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-25 23:11:48,219 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 23:11:48,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 23:11:48,219 INFO L82 PathProgramCache]: Analyzing trace with hash -1198290194, now seen corresponding path program 1 times [2020-10-25 23:11:48,220 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 23:11:48,220 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1867719758] [2020-10-25 23:11:48,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 23:11:48,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:48,270 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:48,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:48,307 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:48,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:48,343 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 23:11:48,344 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1867719758] [2020-10-25 23:11:48,344 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-25 23:11:48,344 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-10-25 23:11:48,344 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1888842324] [2020-10-25 23:11:48,346 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-10-25 23:11:48,346 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 23:11:48,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-10-25 23:11:48,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-10-25 23:11:48,348 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 7 states. [2020-10-25 23:11:48,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 23:11:48,456 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-10-25 23:11:48,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-10-25 23:11:48,457 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-10-25 23:11:48,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 23:11:48,458 INFO L225 Difference]: With dead ends: 30 [2020-10-25 23:11:48,459 INFO L226 Difference]: Without dead ends: 26 [2020-10-25 23:11:48,460 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2020-10-25 23:11:48,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-10-25 23:11:48,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2020-10-25 23:11:48,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-10-25 23:11:48,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-10-25 23:11:48,468 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 16 [2020-10-25 23:11:48,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 23:11:48,469 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-10-25 23:11:48,469 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-10-25 23:11:48,469 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-10-25 23:11:48,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-10-25 23:11:48,470 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 23:11:48,470 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 23:11:48,470 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-25 23:11:48,471 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 23:11:48,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 23:11:48,471 INFO L82 PathProgramCache]: Analyzing trace with hash 602004046, now seen corresponding path program 1 times [2020-10-25 23:11:48,472 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 23:11:48,472 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [947848483] [2020-10-25 23:11:48,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 23:11:48,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:48,535 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:48,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:48,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:48,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:48,628 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:48,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:48,665 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 23:11:48,665 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [947848483] [2020-10-25 23:11:48,666 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1305087459] [2020-10-25 23:11:48,666 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 23:11:48,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:48,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 8 conjunts are in the unsatisfiable core [2020-10-25 23:11:48,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-25 23:11:48,958 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 23:11:48,959 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-25 23:11:48,959 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2020-10-25 23:11:48,959 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690240622] [2020-10-25 23:11:48,960 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-10-25 23:11:48,960 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 23:11:48,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-10-25 23:11:48,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2020-10-25 23:11:48,962 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 11 states. [2020-10-25 23:11:49,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 23:11:49,092 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-10-25 23:11:49,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-25 23:11:49,093 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 22 [2020-10-25 23:11:49,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 23:11:49,094 INFO L225 Difference]: With dead ends: 36 [2020-10-25 23:11:49,095 INFO L226 Difference]: Without dead ends: 32 [2020-10-25 23:11:49,096 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2020-10-25 23:11:49,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-10-25 23:11:49,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 27. [2020-10-25 23:11:49,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-10-25 23:11:49,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 29 transitions. [2020-10-25 23:11:49,104 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 29 transitions. Word has length 22 [2020-10-25 23:11:49,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 23:11:49,105 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 29 transitions. [2020-10-25 23:11:49,105 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-10-25 23:11:49,105 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 29 transitions. [2020-10-25 23:11:49,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-10-25 23:11:49,106 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 23:11:49,107 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 23:11:49,320 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-10-25 23:11:49,321 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 23:11:49,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 23:11:49,322 INFO L82 PathProgramCache]: Analyzing trace with hash -1171563466, now seen corresponding path program 1 times [2020-10-25 23:11:49,323 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 23:11:49,323 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1180665229] [2020-10-25 23:11:49,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 23:11:49,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:49,379 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:49,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:49,444 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:49,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:49,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:49,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:49,530 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:49,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:49,554 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-10-25 23:11:49,555 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1180665229] [2020-10-25 23:11:49,555 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [476997542] [2020-10-25 23:11:49,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 23:11:49,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:49,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 10 conjunts are in the unsatisfiable core [2020-10-25 23:11:49,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-25 23:11:49,729 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-10-25 23:11:49,730 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-25 23:11:49,730 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 12 [2020-10-25 23:11:49,730 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [798104567] [2020-10-25 23:11:49,731 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-10-25 23:11:49,731 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 23:11:49,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-10-25 23:11:49,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132 [2020-10-25 23:11:49,732 INFO L87 Difference]: Start difference. First operand 27 states and 29 transitions. Second operand 12 states. [2020-10-25 23:11:49,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 23:11:49,912 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-10-25 23:11:49,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-25 23:11:49,915 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 28 [2020-10-25 23:11:49,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 23:11:49,917 INFO L225 Difference]: With dead ends: 42 [2020-10-25 23:11:49,917 INFO L226 Difference]: Without dead ends: 38 [2020-10-25 23:11:49,920 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2020-10-25 23:11:49,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-10-25 23:11:49,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 30. [2020-10-25 23:11:49,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-10-25 23:11:49,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-10-25 23:11:49,934 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 28 [2020-10-25 23:11:49,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 23:11:49,934 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-10-25 23:11:49,935 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-10-25 23:11:49,935 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-10-25 23:11:49,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-10-25 23:11:49,936 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 23:11:49,936 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 23:11:50,150 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-25 23:11:50,151 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 23:11:50,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 23:11:50,152 INFO L82 PathProgramCache]: Analyzing trace with hash -232513386, now seen corresponding path program 2 times [2020-10-25 23:11:50,158 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 23:11:50,158 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [665289683] [2020-10-25 23:11:50,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 23:11:50,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:50,232 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:50,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:50,288 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:50,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:50,325 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:50,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:50,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:50,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:50,376 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-25 23:11:50,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-25 23:11:50,410 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-10-25 23:11:50,410 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [665289683] [2020-10-25 23:11:50,411 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [158995168] [2020-10-25 23:11:50,411 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 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 23:11:50,475 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-10-25 23:11:50,475 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-25 23:11:50,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 12 conjunts are in the unsatisfiable core [2020-10-25 23:11:50,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-25 23:11:50,585 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-10-25 23:11:50,585 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-25 23:11:50,585 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 13 [2020-10-25 23:11:50,586 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704130060] [2020-10-25 23:11:50,586 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-10-25 23:11:50,587 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-25 23:11:50,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-10-25 23:11:50,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-10-25 23:11:50,588 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 13 states. [2020-10-25 23:11:50,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-25 23:11:50,767 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-10-25 23:11:50,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-25 23:11:50,767 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-10-25 23:11:50,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-25 23:11:50,769 INFO L225 Difference]: With dead ends: 48 [2020-10-25 23:11:50,769 INFO L226 Difference]: Without dead ends: 44 [2020-10-25 23:11:50,770 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-10-25 23:11:50,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-10-25 23:11:50,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 33. [2020-10-25 23:11:50,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-10-25 23:11:50,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2020-10-25 23:11:50,785 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 34 [2020-10-25 23:11:50,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-25 23:11:50,785 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2020-10-25 23:11:50,785 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-10-25 23:11:50,785 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2020-10-25 23:11:50,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-10-25 23:11:50,787 INFO L414 BasicCegarLoop]: Found error trace [2020-10-25 23:11:50,789 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-25 23:11:51,002 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-25 23:11:51,003 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-25 23:11:51,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-25 23:11:51,004 INFO L82 PathProgramCache]: Analyzing trace with hash -1788325506, now seen corresponding path program 2 times [2020-10-25 23:11:51,005 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-25 23:11:51,005 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1963901122] [2020-10-25 23:11:51,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-25 23:11:51,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-25 23:11:51,024 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-25 23:11:51,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-25 23:11:51,039 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-25 23:11:51,068 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-25 23:11:51,068 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-25 23:11:51,069 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-25 23:11:51,119 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 25.10 11:11:51 BoogieIcfgContainer [2020-10-25 23:11:51,119 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-25 23:11:51,120 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-10-25 23:11:51,120 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-10-25 23:11:51,120 INFO L275 PluginConnector]: Witness Printer initialized [2020-10-25 23:11:51,121 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.10 11:11:47" (3/4) ... [2020-10-25 23:11:51,126 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-10-25 23:11:51,229 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2020-10-25 23:11:51,230 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-10-25 23:11:51,235 INFO L168 Benchmark]: Toolchain (without parser) took 4727.78 ms. Allocated memory was 52.4 MB in the beginning and 75.5 MB in the end (delta: 23.1 MB). Free memory was 30.6 MB in the beginning and 42.6 MB in the end (delta: -12.1 MB). Peak memory consumption was 12.3 MB. Max. memory is 16.1 GB. [2020-10-25 23:11:51,237 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 37.7 MB. Free memory was 20.3 MB in the beginning and 20.2 MB in the end (delta: 56.0 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-10-25 23:11:51,239 INFO L168 Benchmark]: CACSL2BoogieTranslator took 451.46 ms. Allocated memory is still 52.4 MB. Free memory was 29.8 MB in the beginning and 34.1 MB in the end (delta: -4.3 MB). Peak memory consumption was 7.5 MB. Max. memory is 16.1 GB. [2020-10-25 23:11:51,242 INFO L168 Benchmark]: Boogie Procedure Inliner took 51.99 ms. Allocated memory is still 52.4 MB. Free memory was 34.1 MB in the beginning and 32.7 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-10-25 23:11:51,243 INFO L168 Benchmark]: Boogie Preprocessor took 55.22 ms. Allocated memory is still 52.4 MB. Free memory was 32.7 MB in the beginning and 31.9 MB in the end (delta: 870.3 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-10-25 23:11:51,243 INFO L168 Benchmark]: RCFGBuilder took 516.30 ms. Allocated memory is still 52.4 MB. Free memory was 31.7 MB in the beginning and 33.7 MB in the end (delta: -2.1 MB). Peak memory consumption was 11.8 MB. Max. memory is 16.1 GB. [2020-10-25 23:11:51,244 INFO L168 Benchmark]: TraceAbstraction took 3519.36 ms. Allocated memory was 52.4 MB in the beginning and 75.5 MB in the end (delta: 23.1 MB). Free memory was 33.3 MB in the beginning and 46.0 MB in the end (delta: -12.6 MB). Peak memory consumption was 11.8 MB. Max. memory is 16.1 GB. [2020-10-25 23:11:51,245 INFO L168 Benchmark]: Witness Printer took 112.71 ms. Allocated memory is still 75.5 MB. Free memory was 46.0 MB in the beginning and 42.6 MB in the end (delta: 3.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-10-25 23:11:51,250 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 37.7 MB. Free memory was 20.3 MB in the beginning and 20.2 MB in the end (delta: 56.0 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 451.46 ms. Allocated memory is still 52.4 MB. Free memory was 29.8 MB in the beginning and 34.1 MB in the end (delta: -4.3 MB). Peak memory consumption was 7.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 51.99 ms. Allocated memory is still 52.4 MB. Free memory was 34.1 MB in the beginning and 32.7 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 55.22 ms. Allocated memory is still 52.4 MB. Free memory was 32.7 MB in the beginning and 31.9 MB in the end (delta: 870.3 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 516.30 ms. Allocated memory is still 52.4 MB. Free memory was 31.7 MB in the beginning and 33.7 MB in the end (delta: -2.1 MB). Peak memory consumption was 11.8 MB. Max. memory is 16.1 GB. * TraceAbstraction took 3519.36 ms. Allocated memory was 52.4 MB in the beginning and 75.5 MB in the end (delta: 23.1 MB). Free memory was 33.3 MB in the beginning and 46.0 MB in the end (delta: -12.6 MB). Peak memory consumption was 11.8 MB. Max. memory is 16.1 GB. * Witness Printer took 112.71 ms. Allocated memory is still 75.5 MB. Free memory was 46.0 MB in the beginning and 42.6 MB in the end (delta: 3.3 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: [L20] int input = 5; [L21] CALL, EXPR id(input) VAL [\old(x)=5] [L10] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L11] CALL, EXPR id2(x-1) VAL [\old(x)=4] [L15] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L16] CALL, EXPR id(x-1) VAL [\old(x)=3] [L10] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L11] CALL, EXPR id2(x-1) VAL [\old(x)=2] [L15] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L16] CALL, EXPR id(x-1) VAL [\old(x)=1] [L10] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L11] CALL, EXPR id2(x-1) VAL [\old(x)=0] [L15] COND TRUE x==0 [L15] return 0; VAL [\old(x)=0, \result=0, x=0] [L11] RET, EXPR id2(x-1) VAL [\old(x)=1, id2(x-1)=0, x=1] [L11] return id2(x-1) + 1; [L16] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L16] return id(x-1) + 1; [L11] RET, EXPR id2(x-1) VAL [\old(x)=3, id2(x-1)=2, x=3] [L11] return id2(x-1) + 1; [L16] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L16] return id(x-1) + 1; [L11] RET, EXPR id2(x-1) VAL [\old(x)=5, id2(x-1)=4, x=5] [L11] return id2(x-1) + 1; [L21] RET, EXPR id(input) [L21] int result = id(input); [L22] COND TRUE result == 5 [L4] __assert_fail("0", "id2_i5_o5-1.c", 4, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 23 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.3s, OverallIterations: 6, TraceHistogramMax: 3, AutomataDifference: 0.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 78 SDtfs, 90 SDslu, 352 SDs, 0 SdLazy, 235 SolverSat, 20 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 156 GetRequests, 104 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=33occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 5 MinimizatonAttempts, 26 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.2s InterpolantComputationTime, 234 NumberOfCodeBlocks, 234 NumberOfCodeBlocksAsserted, 10 NumberOfCheckSat, 186 ConstructedInterpolants, 0 QuantifiedInterpolants, 11562 SizeOfPredicates, 15 NumberOfNonLiveVariables, 285 ConjunctsInSsa, 30 ConjunctsInUnsatCore, 8 InterpolantComputations, 2 PerfectInterpolantSequences, 34/68 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...