./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30f4e4ab Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx12G -Xms1G -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.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(__VERIFIER_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 7a7b79fb8a331a00295fb9ddfb653e17bda3c30d ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 0.1.24-30f4e4a [2019-11-28 00:25:07,613 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-28 00:25:07,616 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-28 00:25:07,633 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-28 00:25:07,633 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-28 00:25:07,634 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-28 00:25:07,636 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-28 00:25:07,638 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-28 00:25:07,640 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-28 00:25:07,641 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-28 00:25:07,642 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-28 00:25:07,643 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-28 00:25:07,643 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-28 00:25:07,644 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-28 00:25:07,646 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-28 00:25:07,647 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-28 00:25:07,648 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-28 00:25:07,649 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-28 00:25:07,651 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-28 00:25:07,653 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-28 00:25:07,656 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-28 00:25:07,657 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-28 00:25:07,658 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-28 00:25:07,660 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-28 00:25:07,667 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-28 00:25:07,667 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-28 00:25:07,667 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-28 00:25:07,669 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-28 00:25:07,669 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-28 00:25:07,672 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-28 00:25:07,673 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-28 00:25:07,674 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-28 00:25:07,674 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-28 00:25:07,675 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-28 00:25:07,678 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-28 00:25:07,679 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-28 00:25:07,680 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-28 00:25:07,680 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-28 00:25:07,680 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-28 00:25:07,681 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-28 00:25:07,682 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-28 00:25:07,685 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-28 00:25:07,704 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-28 00:25:07,704 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-28 00:25:07,706 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-28 00:25:07,707 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-28 00:25:07,707 INFO L138 SettingsManager]: * Use SBE=true [2019-11-28 00:25:07,707 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-28 00:25:07,708 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-28 00:25:07,708 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-28 00:25:07,708 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-28 00:25:07,709 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-28 00:25:07,710 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-28 00:25:07,710 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-28 00:25:07,711 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-28 00:25:07,711 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-28 00:25:07,712 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-28 00:25:07,712 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-28 00:25:07,712 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-28 00:25:07,713 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-28 00:25:07,713 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-28 00:25:07,713 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-28 00:25:07,714 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-28 00:25:07,714 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-28 00:25:07,714 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-28 00:25:07,715 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-28 00:25:07,715 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-28 00:25:07,716 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-28 00:25:07,716 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-28 00:25:07,716 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-28 00:25:07,716 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(__VERIFIER_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 -> 7a7b79fb8a331a00295fb9ddfb653e17bda3c30d [2019-11-28 00:25:08,076 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-28 00:25:08,096 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-28 00:25:08,101 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-28 00:25:08,102 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-28 00:25:08,104 INFO L275 PluginConnector]: CDTParser initialized [2019-11-28 00:25:08,105 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c [2019-11-28 00:25:08,186 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0772bc04c/1493f5505c2d4b40b258516659997030/FLAG637f7558a [2019-11-28 00:25:08,670 INFO L306 CDTParser]: Found 1 translation units. [2019-11-28 00:25:08,671 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/fibo_2calls_4-2.c [2019-11-28 00:25:08,682 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0772bc04c/1493f5505c2d4b40b258516659997030/FLAG637f7558a [2019-11-28 00:25:09,113 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0772bc04c/1493f5505c2d4b40b258516659997030 [2019-11-28 00:25:09,118 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-28 00:25:09,120 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-11-28 00:25:09,121 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-28 00:25:09,121 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-28 00:25:09,125 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-28 00:25:09,126 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 12:25:09" (1/1) ... [2019-11-28 00:25:09,130 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3c163bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:25:09, skipping insertion in model container [2019-11-28 00:25:09,130 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 12:25:09" (1/1) ... [2019-11-28 00:25:09,138 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2019-11-28 00:25:09,157 INFO L178 MainTranslator]: Built tables and reachable declarations [2019-11-28 00:25:09,339 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-28 00:25:09,343 INFO L203 MainTranslator]: Completed pre-run [2019-11-28 00:25:09,357 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-28 00:25:09,368 INFO L208 MainTranslator]: Completed translation [2019-11-28 00:25:09,369 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:25:09 WrapperNode [2019-11-28 00:25:09,369 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-28 00:25:09,370 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-11-28 00:25:09,370 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-11-28 00:25:09,370 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-11-28 00:25:09,379 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:25:09" (1/1) ... [2019-11-28 00:25:09,383 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:25:09" (1/1) ... [2019-11-28 00:25:09,454 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-11-28 00:25:09,456 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-28 00:25:09,456 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-28 00:25:09,456 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-28 00:25:09,463 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:25:09" (1/1) ... [2019-11-28 00:25:09,464 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:25:09" (1/1) ... [2019-11-28 00:25:09,464 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:25:09" (1/1) ... [2019-11-28 00:25:09,465 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:25:09" (1/1) ... [2019-11-28 00:25:09,467 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:25:09" (1/1) ... [2019-11-28 00:25:09,470 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:25:09" (1/1) ... [2019-11-28 00:25:09,471 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:25:09" (1/1) ... [2019-11-28 00:25:09,472 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-28 00:25:09,473 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-28 00:25:09,473 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-28 00:25:09,473 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-28 00:25:09,474 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:25:09" (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 [2019-11-28 00:25:09,535 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-28 00:25:09,535 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-28 00:25:09,535 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2019-11-28 00:25:09,536 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2019-11-28 00:25:09,537 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2019-11-28 00:25:09,537 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2019-11-28 00:25:09,730 INFO L292 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-28 00:25:09,730 INFO L297 CfgBuilder]: Removed 4 assume(true) statements. [2019-11-28 00:25:09,732 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 12:25:09 BoogieIcfgContainer [2019-11-28 00:25:09,733 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-28 00:25:09,734 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-28 00:25:09,734 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-28 00:25:09,738 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-28 00:25:09,738 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.11 12:25:09" (1/3) ... [2019-11-28 00:25:09,739 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c44481c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 12:25:09, skipping insertion in model container [2019-11-28 00:25:09,739 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 12:25:09" (2/3) ... [2019-11-28 00:25:09,740 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c44481c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 12:25:09, skipping insertion in model container [2019-11-28 00:25:09,740 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 12:25:09" (3/3) ... [2019-11-28 00:25:09,742 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_4-2.c [2019-11-28 00:25:09,754 INFO L156 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-28 00:25:09,763 INFO L168 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-28 00:25:09,805 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-28 00:25:09,844 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-28 00:25:09,848 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-28 00:25:09,848 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-28 00:25:09,849 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-28 00:25:09,851 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-28 00:25:09,851 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-28 00:25:09,851 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-28 00:25:09,852 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-28 00:25:09,875 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states. [2019-11-28 00:25:09,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-11-28 00:25:09,881 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 00:25:09,883 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 00:25:09,883 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 00:25:09,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 00:25:09,888 INFO L82 PathProgramCache]: Analyzing trace with hash 1871295635, now seen corresponding path program 1 times [2019-11-28 00:25:09,895 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 00:25:09,896 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1986118054] [2019-11-28 00:25:09,896 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 00:25:09,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:10,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:10,157 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-28 00:25:10,158 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1986118054] [2019-11-28 00:25:10,159 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-28 00:25:10,159 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2019-11-28 00:25:10,161 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629229858] [2019-11-28 00:25:10,166 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-28 00:25:10,167 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-28 00:25:10,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-28 00:25:10,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2019-11-28 00:25:10,181 INFO L87 Difference]: Start difference. First operand 28 states. Second operand 7 states. [2019-11-28 00:25:10,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-28 00:25:10,339 INFO L93 Difference]: Finished difference Result 38 states and 47 transitions. [2019-11-28 00:25:10,340 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-28 00:25:10,342 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 9 [2019-11-28 00:25:10,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-28 00:25:10,354 INFO L225 Difference]: With dead ends: 38 [2019-11-28 00:25:10,354 INFO L226 Difference]: Without dead ends: 26 [2019-11-28 00:25:10,358 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2019-11-28 00:25:10,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-11-28 00:25:10,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-11-28 00:25:10,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-11-28 00:25:10,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2019-11-28 00:25:10,402 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 9 [2019-11-28 00:25:10,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-28 00:25:10,403 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2019-11-28 00:25:10,403 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-28 00:25:10,403 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2019-11-28 00:25:10,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-28 00:25:10,405 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 00:25:10,405 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 00:25:10,406 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 00:25:10,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 00:25:10,406 INFO L82 PathProgramCache]: Analyzing trace with hash -1404217650, now seen corresponding path program 1 times [2019-11-28 00:25:10,406 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 00:25:10,407 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1726473702] [2019-11-28 00:25:10,407 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 00:25:10,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:10,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:10,518 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-28 00:25:10,520 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1726473702] [2019-11-28 00:25:10,521 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-28 00:25:10,521 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2019-11-28 00:25:10,521 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256477424] [2019-11-28 00:25:10,527 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-28 00:25:10,530 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-28 00:25:10,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-28 00:25:10,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2019-11-28 00:25:10,531 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand 7 states. [2019-11-28 00:25:10,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-28 00:25:10,649 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2019-11-28 00:25:10,650 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-28 00:25:10,650 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 10 [2019-11-28 00:25:10,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-28 00:25:10,652 INFO L225 Difference]: With dead ends: 32 [2019-11-28 00:25:10,652 INFO L226 Difference]: Without dead ends: 28 [2019-11-28 00:25:10,654 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2019-11-28 00:25:10,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-11-28 00:25:10,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2019-11-28 00:25:10,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-11-28 00:25:10,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2019-11-28 00:25:10,664 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 10 [2019-11-28 00:25:10,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-28 00:25:10,665 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2019-11-28 00:25:10,665 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-28 00:25:10,665 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2019-11-28 00:25:10,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-11-28 00:25:10,667 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 00:25:10,667 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 00:25:10,667 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 00:25:10,668 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 00:25:10,668 INFO L82 PathProgramCache]: Analyzing trace with hash -1629927371, now seen corresponding path program 1 times [2019-11-28 00:25:10,668 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 00:25:10,669 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [374830447] [2019-11-28 00:25:10,669 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 00:25:10,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:10,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:10,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:10,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:10,841 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-28 00:25:10,842 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [374830447] [2019-11-28 00:25:10,842 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [417095938] [2019-11-28 00:25:10,842 INFO L94 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 [2019-11-28 00:25:10,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:10,885 INFO L255 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-28 00:25:10,892 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-28 00:25:10,984 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-28 00:25:10,985 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-28 00:25:10,985 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 12 [2019-11-28 00:25:10,986 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [389280123] [2019-11-28 00:25:10,987 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-28 00:25:10,987 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-28 00:25:10,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-28 00:25:10,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2019-11-28 00:25:10,989 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand 12 states. [2019-11-28 00:25:11,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-28 00:25:11,172 INFO L93 Difference]: Finished difference Result 59 states and 83 transitions. [2019-11-28 00:25:11,172 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-28 00:25:11,173 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 22 [2019-11-28 00:25:11,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-28 00:25:11,174 INFO L225 Difference]: With dead ends: 59 [2019-11-28 00:25:11,175 INFO L226 Difference]: Without dead ends: 35 [2019-11-28 00:25:11,176 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2019-11-28 00:25:11,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-11-28 00:25:11,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 33. [2019-11-28 00:25:11,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2019-11-28 00:25:11,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 42 transitions. [2019-11-28 00:25:11,186 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 42 transitions. Word has length 22 [2019-11-28 00:25:11,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-28 00:25:11,187 INFO L462 AbstractCegarLoop]: Abstraction has 33 states and 42 transitions. [2019-11-28 00:25:11,187 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-28 00:25:11,187 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 42 transitions. [2019-11-28 00:25:11,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-28 00:25:11,189 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 00:25:11,190 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 00:25:11,393 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 00:25:11,394 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 00:25:11,394 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 00:25:11,395 INFO L82 PathProgramCache]: Analyzing trace with hash 1285987244, now seen corresponding path program 1 times [2019-11-28 00:25:11,395 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 00:25:11,396 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1839153292] [2019-11-28 00:25:11,396 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 00:25:11,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:11,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:11,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:11,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:11,546 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-28 00:25:11,547 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1839153292] [2019-11-28 00:25:11,548 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1005647137] [2019-11-28 00:25:11,548 INFO L94 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) [2019-11-28 00:25:11,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 00:25:11,588 INFO L255 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-28 00:25:11,590 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-28 00:25:11,628 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-28 00:25:11,628 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-28 00:25:11,628 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 12 [2019-11-28 00:25:11,629 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1284041000] [2019-11-28 00:25:11,630 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-28 00:25:11,630 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-28 00:25:11,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-28 00:25:11,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2019-11-28 00:25:11,631 INFO L87 Difference]: Start difference. First operand 33 states and 42 transitions. Second operand 12 states. [2019-11-28 00:25:11,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-28 00:25:11,912 INFO L93 Difference]: Finished difference Result 55 states and 78 transitions. [2019-11-28 00:25:11,913 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-28 00:25:11,913 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 23 [2019-11-28 00:25:11,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-28 00:25:11,918 INFO L225 Difference]: With dead ends: 55 [2019-11-28 00:25:11,919 INFO L226 Difference]: Without dead ends: 51 [2019-11-28 00:25:11,922 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2019-11-28 00:25:11,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2019-11-28 00:25:11,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2019-11-28 00:25:11,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-11-28 00:25:11,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 68 transitions. [2019-11-28 00:25:11,957 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 68 transitions. Word has length 23 [2019-11-28 00:25:11,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-28 00:25:11,958 INFO L462 AbstractCegarLoop]: Abstraction has 48 states and 68 transitions. [2019-11-28 00:25:11,958 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-28 00:25:11,960 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 68 transitions. [2019-11-28 00:25:11,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-11-28 00:25:11,964 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 00:25:11,964 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 00:25:12,170 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 00:25:12,172 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 00:25:12,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 00:25:12,173 INFO L82 PathProgramCache]: Analyzing trace with hash -649262923, now seen corresponding path program 1 times [2019-11-28 00:25:12,173 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 00:25:12,174 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [294093498] [2019-11-28 00:25:12,174 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 00:25:12,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:12,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:12,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:12,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:12,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:12,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:12,398 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-28 00:25:12,398 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [294093498] [2019-11-28 00:25:12,399 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [866526992] [2019-11-28 00:25:12,399 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-11-28 00:25:12,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:12,442 INFO L255 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-28 00:25:12,445 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-28 00:25:12,579 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-11-28 00:25:12,580 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-28 00:25:12,580 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 14 [2019-11-28 00:25:12,580 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346452333] [2019-11-28 00:25:12,582 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-28 00:25:12,582 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-28 00:25:12,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-28 00:25:12,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=152, Unknown=0, NotChecked=0, Total=182 [2019-11-28 00:25:12,585 INFO L87 Difference]: Start difference. First operand 48 states and 68 transitions. Second operand 14 states. [2019-11-28 00:25:12,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-28 00:25:12,974 INFO L93 Difference]: Finished difference Result 114 states and 187 transitions. [2019-11-28 00:25:12,975 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-28 00:25:12,975 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2019-11-28 00:25:12,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-28 00:25:12,978 INFO L225 Difference]: With dead ends: 114 [2019-11-28 00:25:12,978 INFO L226 Difference]: Without dead ends: 68 [2019-11-28 00:25:12,980 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2019-11-28 00:25:12,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-11-28 00:25:12,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 66. [2019-11-28 00:25:12,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2019-11-28 00:25:12,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 98 transitions. [2019-11-28 00:25:12,996 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 98 transitions. Word has length 35 [2019-11-28 00:25:12,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-28 00:25:12,996 INFO L462 AbstractCegarLoop]: Abstraction has 66 states and 98 transitions. [2019-11-28 00:25:12,996 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-28 00:25:12,997 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 98 transitions. [2019-11-28 00:25:12,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-11-28 00:25:12,999 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 00:25:12,999 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 00:25:13,203 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 00:25:13,208 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 00:25:13,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 00:25:13,209 INFO L82 PathProgramCache]: Analyzing trace with hash 2000747716, now seen corresponding path program 1 times [2019-11-28 00:25:13,209 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 00:25:13,209 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1753192523] [2019-11-28 00:25:13,210 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 00:25:13,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:13,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:13,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:13,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:13,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:13,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:13,327 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-11-28 00:25:13,328 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1753192523] [2019-11-28 00:25:13,328 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1852636281] [2019-11-28 00:25:13,329 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-11-28 00:25:13,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:13,366 INFO L255 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-28 00:25:13,369 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-28 00:25:13,448 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-28 00:25:13,449 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-28 00:25:13,449 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 14 [2019-11-28 00:25:13,450 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [393061885] [2019-11-28 00:25:13,451 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-11-28 00:25:13,451 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-28 00:25:13,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-11-28 00:25:13,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2019-11-28 00:25:13,452 INFO L87 Difference]: Start difference. First operand 66 states and 98 transitions. Second operand 14 states. [2019-11-28 00:25:13,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-28 00:25:13,780 INFO L93 Difference]: Finished difference Result 147 states and 239 transitions. [2019-11-28 00:25:13,781 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-11-28 00:25:13,781 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2019-11-28 00:25:13,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-28 00:25:13,783 INFO L225 Difference]: With dead ends: 147 [2019-11-28 00:25:13,783 INFO L226 Difference]: Without dead ends: 83 [2019-11-28 00:25:13,786 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=64, Invalid=278, Unknown=0, NotChecked=0, Total=342 [2019-11-28 00:25:13,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2019-11-28 00:25:13,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 66. [2019-11-28 00:25:13,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2019-11-28 00:25:13,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 96 transitions. [2019-11-28 00:25:13,799 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 96 transitions. Word has length 36 [2019-11-28 00:25:13,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-28 00:25:13,799 INFO L462 AbstractCegarLoop]: Abstraction has 66 states and 96 transitions. [2019-11-28 00:25:13,799 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-11-28 00:25:13,800 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 96 transitions. [2019-11-28 00:25:13,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2019-11-28 00:25:13,802 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 00:25:13,802 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 00:25:14,005 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 00:25:14,005 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 00:25:14,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 00:25:14,006 INFO L82 PathProgramCache]: Analyzing trace with hash -434541687, now seen corresponding path program 1 times [2019-11-28 00:25:14,006 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 00:25:14,006 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [966724312] [2019-11-28 00:25:14,007 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 00:25:14,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:14,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:14,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:14,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:14,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:14,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:14,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:14,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:14,249 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 6 proven. 11 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2019-11-28 00:25:14,249 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [966724312] [2019-11-28 00:25:14,250 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [799056032] [2019-11-28 00:25:14,250 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 00:25:14,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:14,297 INFO L255 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-28 00:25:14,301 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-28 00:25:14,375 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2019-11-28 00:25:14,375 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-28 00:25:14,376 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8] total 17 [2019-11-28 00:25:14,376 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1563877683] [2019-11-28 00:25:14,377 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-28 00:25:14,377 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-28 00:25:14,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-28 00:25:14,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2019-11-28 00:25:14,377 INFO L87 Difference]: Start difference. First operand 66 states and 96 transitions. Second operand 17 states. [2019-11-28 00:25:14,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-28 00:25:14,764 INFO L93 Difference]: Finished difference Result 163 states and 263 transitions. [2019-11-28 00:25:14,766 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-28 00:25:14,766 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 50 [2019-11-28 00:25:14,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-28 00:25:14,771 INFO L225 Difference]: With dead ends: 163 [2019-11-28 00:25:14,771 INFO L226 Difference]: Without dead ends: 99 [2019-11-28 00:25:14,773 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=84, Invalid=422, Unknown=0, NotChecked=0, Total=506 [2019-11-28 00:25:14,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2019-11-28 00:25:14,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 91. [2019-11-28 00:25:14,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2019-11-28 00:25:14,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 143 transitions. [2019-11-28 00:25:14,794 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 143 transitions. Word has length 50 [2019-11-28 00:25:14,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-28 00:25:14,795 INFO L462 AbstractCegarLoop]: Abstraction has 91 states and 143 transitions. [2019-11-28 00:25:14,795 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-28 00:25:14,796 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 143 transitions. [2019-11-28 00:25:14,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-11-28 00:25:14,799 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 00:25:14,799 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 00:25:15,007 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 00:25:15,007 INFO L410 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 00:25:15,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 00:25:15,008 INFO L82 PathProgramCache]: Analyzing trace with hash -751947822, now seen corresponding path program 1 times [2019-11-28 00:25:15,008 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 00:25:15,008 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1341850016] [2019-11-28 00:25:15,009 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 00:25:15,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:15,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:15,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:15,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:15,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:15,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:15,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:15,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:15,200 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 19 proven. 11 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-11-28 00:25:15,200 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1341850016] [2019-11-28 00:25:15,201 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [329601782] [2019-11-28 00:25:15,201 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2019-11-28 00:25:15,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:15,237 INFO L255 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-28 00:25:15,242 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-28 00:25:15,319 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 18 proven. 5 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-11-28 00:25:15,319 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-28 00:25:15,319 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7] total 15 [2019-11-28 00:25:15,319 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115589145] [2019-11-28 00:25:15,320 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-28 00:25:15,320 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-28 00:25:15,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-28 00:25:15,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2019-11-28 00:25:15,321 INFO L87 Difference]: Start difference. First operand 91 states and 143 transitions. Second operand 15 states. [2019-11-28 00:25:15,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-28 00:25:15,674 INFO L93 Difference]: Finished difference Result 182 states and 293 transitions. [2019-11-28 00:25:15,675 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-28 00:25:15,675 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 51 [2019-11-28 00:25:15,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-28 00:25:15,678 INFO L225 Difference]: With dead ends: 182 [2019-11-28 00:25:15,678 INFO L226 Difference]: Without dead ends: 91 [2019-11-28 00:25:15,680 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=73, Invalid=307, Unknown=0, NotChecked=0, Total=380 [2019-11-28 00:25:15,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2019-11-28 00:25:15,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 83. [2019-11-28 00:25:15,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2019-11-28 00:25:15,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 123 transitions. [2019-11-28 00:25:15,693 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 123 transitions. Word has length 51 [2019-11-28 00:25:15,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-28 00:25:15,693 INFO L462 AbstractCegarLoop]: Abstraction has 83 states and 123 transitions. [2019-11-28 00:25:15,693 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-28 00:25:15,694 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 123 transitions. [2019-11-28 00:25:15,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2019-11-28 00:25:15,695 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 00:25:15,695 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2019-11-28 00:25:15,899 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 00:25:15,900 INFO L410 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 00:25:15,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 00:25:15,901 INFO L82 PathProgramCache]: Analyzing trace with hash 629760405, now seen corresponding path program 2 times [2019-11-28 00:25:15,902 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 00:25:15,902 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [199162449] [2019-11-28 00:25:15,903 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 00:25:15,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:15,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:16,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:16,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:16,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:16,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:16,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:16,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:16,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:16,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:16,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:16,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-28 00:25:16,313 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 31 proven. 51 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2019-11-28 00:25:16,314 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [199162449] [2019-11-28 00:25:16,314 INFO L348 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [329473375] [2019-11-28 00:25:16,314 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 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 [2019-11-28 00:25:16,368 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-28 00:25:16,369 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-28 00:25:16,370 INFO L255 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-28 00:25:16,374 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2019-11-28 00:25:16,508 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 44 proven. 17 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2019-11-28 00:25:16,508 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-28 00:25:16,509 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 9] total 22 [2019-11-28 00:25:16,509 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1798203746] [2019-11-28 00:25:16,510 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-11-28 00:25:16,510 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-28 00:25:16,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-11-28 00:25:16,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=398, Unknown=0, NotChecked=0, Total=462 [2019-11-28 00:25:16,511 INFO L87 Difference]: Start difference. First operand 83 states and 123 transitions. Second operand 22 states. [2019-11-28 00:25:17,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-28 00:25:17,015 INFO L93 Difference]: Finished difference Result 189 states and 316 transitions. [2019-11-28 00:25:17,015 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-28 00:25:17,016 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 78 [2019-11-28 00:25:17,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-28 00:25:17,019 INFO L225 Difference]: With dead ends: 189 [2019-11-28 00:25:17,019 INFO L226 Difference]: Without dead ends: 100 [2019-11-28 00:25:17,021 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 94 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=119, Invalid=637, Unknown=0, NotChecked=0, Total=756 [2019-11-28 00:25:17,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2019-11-28 00:25:17,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 87. [2019-11-28 00:25:17,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2019-11-28 00:25:17,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 120 transitions. [2019-11-28 00:25:17,036 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 120 transitions. Word has length 78 [2019-11-28 00:25:17,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-28 00:25:17,037 INFO L462 AbstractCegarLoop]: Abstraction has 87 states and 120 transitions. [2019-11-28 00:25:17,037 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-11-28 00:25:17,037 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 120 transitions. [2019-11-28 00:25:17,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2019-11-28 00:25:17,039 INFO L402 BasicCegarLoop]: Found error trace [2019-11-28 00:25:17,039 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-28 00:25:17,245 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-28 00:25:17,246 INFO L410 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-28 00:25:17,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-28 00:25:17,248 INFO L82 PathProgramCache]: Analyzing trace with hash -26046796, now seen corresponding path program 1 times [2019-11-28 00:25:17,248 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-28 00:25:17,249 INFO L348 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [82989299] [2019-11-28 00:25:17,249 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-28 00:25:17,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-28 00:25:17,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-11-28 00:25:17,289 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2019-11-28 00:25:17,289 INFO L475 BasicCegarLoop]: Counterexample might be feasible [2019-11-28 00:25:17,365 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.11 12:25:17 BoogieIcfgContainer [2019-11-28 00:25:17,365 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-11-28 00:25:17,366 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-11-28 00:25:17,366 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-11-28 00:25:17,367 INFO L275 PluginConnector]: Witness Printer initialized [2019-11-28 00:25:17,367 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 12:25:09" (3/4) ... [2019-11-28 00:25:17,370 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-11-28 00:25:17,441 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2019-11-28 00:25:17,441 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-11-28 00:25:17,444 INFO L168 Benchmark]: Toolchain (without parser) took 8324.11 ms. Allocated memory was 1.0 GB in the beginning and 1.3 GB in the end (delta: 267.4 MB). Free memory was 956.3 MB in the beginning and 1.3 GB in the end (delta: -306.1 MB). There was no memory consumed. Max. memory is 11.5 GB. [2019-11-28 00:25:17,445 INFO L168 Benchmark]: CDTParser took 0.56 ms. Allocated memory is still 1.0 GB. Free memory is still 987.2 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-28 00:25:17,445 INFO L168 Benchmark]: CACSL2BoogieTranslator took 248.42 ms. Allocated memory is still 1.0 GB. Free memory was 956.3 MB in the beginning and 945.6 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2019-11-28 00:25:17,446 INFO L168 Benchmark]: Boogie Procedure Inliner took 85.51 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 81.8 MB). Free memory was 945.6 MB in the beginning and 1.1 GB in the end (delta: -132.2 MB). Peak memory consumption was 9.9 MB. Max. memory is 11.5 GB. [2019-11-28 00:25:17,446 INFO L168 Benchmark]: Boogie Preprocessor took 16.70 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 6.8 MB). Peak memory consumption was 6.8 MB. Max. memory is 11.5 GB. [2019-11-28 00:25:17,447 INFO L168 Benchmark]: RCFGBuilder took 260.19 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 18.2 MB). Peak memory consumption was 18.2 MB. Max. memory is 11.5 GB. [2019-11-28 00:25:17,448 INFO L168 Benchmark]: TraceAbstraction took 7631.65 ms. Allocated memory was 1.1 GB in the beginning and 1.3 GB in the end (delta: 185.6 MB). Free memory was 1.1 GB in the beginning and 1.3 GB in the end (delta: -209.8 MB). Peak memory consumption was 395.6 MB. Max. memory is 11.5 GB. [2019-11-28 00:25:17,448 INFO L168 Benchmark]: Witness Printer took 75.50 ms. Allocated memory is still 1.3 GB. Free memory is still 1.3 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-11-28 00:25:17,451 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.56 ms. Allocated memory is still 1.0 GB. Free memory is still 987.2 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 248.42 ms. Allocated memory is still 1.0 GB. Free memory was 956.3 MB in the beginning and 945.6 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 85.51 ms. Allocated memory was 1.0 GB in the beginning and 1.1 GB in the end (delta: 81.8 MB). Free memory was 945.6 MB in the beginning and 1.1 GB in the end (delta: -132.2 MB). Peak memory consumption was 9.9 MB. Max. memory is 11.5 GB. * Boogie Preprocessor took 16.70 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 6.8 MB). Peak memory consumption was 6.8 MB. Max. memory is 11.5 GB. * RCFGBuilder took 260.19 ms. Allocated memory is still 1.1 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 18.2 MB). Peak memory consumption was 18.2 MB. Max. memory is 11.5 GB. * TraceAbstraction took 7631.65 ms. Allocated memory was 1.1 GB in the beginning and 1.3 GB in the end (delta: 185.6 MB). Free memory was 1.1 GB in the beginning and 1.3 GB in the end (delta: -209.8 MB). Peak memory consumption was 395.6 MB. Max. memory is 11.5 GB. * Witness Printer took 75.50 ms. Allocated memory is still 1.3 GB. Free memory is still 1.3 GB. There was no memory consumed. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 4; [L37] CALL, EXPR fibo1(x) VAL [\old(n)=4] [L8] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L10] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=4, fibo2(n-1)=2, n=4] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=4, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) [L37] int result = fibo1(x); [L38] COND TRUE result == 3 [L39] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 28 locations, 1 error locations. Result: UNSAFE, OverallTime: 7.4s, OverallIterations: 10, TraceHistogramMax: 6, AutomataDifference: 2.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 210 SDtfs, 383 SDslu, 1378 SDs, 0 SdLazy, 2102 SolverSat, 296 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 503 GetRequests, 366 SyntacticMatches, 1 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 353 ImplicationChecksByTransitivity, 1.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=91occurred in iteration=7, 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, 9 MinimizatonAttempts, 55 StatesRemovedByMinimization, 8 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 2.3s InterpolantComputationTime, 673 NumberOfCodeBlocks, 673 NumberOfCodeBlocksAsserted, 18 NumberOfCheckSat, 593 ConstructedInterpolants, 0 QuantifiedInterpolants, 60425 SizeOfPredicates, 25 NumberOfNonLiveVariables, 676 ConjunctsInSsa, 51 ConjunctsInUnsatCore, 16 InterpolantComputations, 2 PerfectInterpolantSequences, 378/526 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...