./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 cad46833 Calling Ultimate with: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_17a10a26-abef-4763-9406-df6e57a17648/bin/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_17a10a26-abef-4763-9406-df6e57a17648/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_17a10a26-abef-4763-9406-df6e57a17648/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_17a10a26-abef-4763-9406-df6e57a17648/bin/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/recursive-simple/id2_i5_o5-1.c -s /tmp/vcloud-vcloud-master/worker/working_dir_17a10a26-abef-4763-9406-df6e57a17648/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_17a10a26-abef-4763-9406-df6e57a17648/bin/uautomizer --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 59c5766d3cddc0d41e2678bb5221cccc60217431 ...................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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-cad4683 [2019-10-22 08:58:00,435 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-22 08:58:00,437 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-22 08:58:00,448 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-22 08:58:00,449 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-22 08:58:00,450 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-22 08:58:00,451 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-22 08:58:00,453 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-22 08:58:00,454 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-22 08:58:00,455 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-22 08:58:00,456 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-22 08:58:00,457 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-22 08:58:00,457 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-22 08:58:00,458 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-22 08:58:00,459 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-22 08:58:00,460 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-22 08:58:00,461 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-22 08:58:00,462 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-22 08:58:00,463 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-22 08:58:00,465 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-22 08:58:00,467 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-22 08:58:00,468 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-22 08:58:00,469 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-22 08:58:00,470 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-22 08:58:00,472 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-22 08:58:00,473 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-22 08:58:00,473 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-22 08:58:00,474 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-22 08:58:00,474 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-22 08:58:00,475 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-22 08:58:00,475 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-22 08:58:00,476 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-22 08:58:00,477 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-22 08:58:00,478 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-22 08:58:00,479 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-22 08:58:00,479 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-22 08:58:00,480 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-22 08:58:00,480 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-22 08:58:00,480 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-22 08:58:00,481 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-22 08:58:00,482 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-22 08:58:00,482 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_17a10a26-abef-4763-9406-df6e57a17648/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-22 08:58:00,495 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-22 08:58:00,496 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-22 08:58:00,497 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-22 08:58:00,497 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-22 08:58:00,498 INFO L138 SettingsManager]: * Use SBE=true [2019-10-22 08:58:00,498 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-22 08:58:00,498 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-22 08:58:00,498 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-22 08:58:00,498 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-22 08:58:00,499 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-22 08:58:00,499 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-22 08:58:00,499 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-22 08:58:00,499 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-22 08:58:00,500 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-22 08:58:00,500 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-22 08:58:00,500 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-22 08:58:00,500 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-22 08:58:00,500 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-22 08:58:00,501 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-22 08:58:00,501 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-22 08:58:00,501 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-22 08:58:00,501 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-22 08:58:00,502 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-22 08:58:00,502 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-22 08:58:00,502 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-22 08:58:00,503 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-22 08:58:00,503 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-22 08:58:00,503 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-22 08:58:00,503 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 -> /tmp/vcloud-vcloud-master/worker/working_dir_17a10a26-abef-4763-9406-df6e57a17648/bin/uautomizer 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 -> 59c5766d3cddc0d41e2678bb5221cccc60217431 [2019-10-22 08:58:00,533 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-22 08:58:00,544 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-22 08:58:00,548 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-22 08:58:00,550 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-22 08:58:00,550 INFO L275 PluginConnector]: CDTParser initialized [2019-10-22 08:58:00,551 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_17a10a26-abef-4763-9406-df6e57a17648/bin/uautomizer/../../sv-benchmarks/c/recursive-simple/id2_i5_o5-1.c [2019-10-22 08:58:00,611 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_17a10a26-abef-4763-9406-df6e57a17648/bin/uautomizer/data/1d8b2c4bc/12e237a92c4e45028d0aaa8ef1be0cc1/FLAG6bc102335 [2019-10-22 08:58:00,950 INFO L306 CDTParser]: Found 1 translation units. [2019-10-22 08:58:00,950 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_17a10a26-abef-4763-9406-df6e57a17648/sv-benchmarks/c/recursive-simple/id2_i5_o5-1.c [2019-10-22 08:58:00,956 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_17a10a26-abef-4763-9406-df6e57a17648/bin/uautomizer/data/1d8b2c4bc/12e237a92c4e45028d0aaa8ef1be0cc1/FLAG6bc102335 [2019-10-22 08:58:01,334 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_17a10a26-abef-4763-9406-df6e57a17648/bin/uautomizer/data/1d8b2c4bc/12e237a92c4e45028d0aaa8ef1be0cc1 [2019-10-22 08:58:01,337 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-22 08:58:01,338 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-10-22 08:58:01,339 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-22 08:58:01,340 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-22 08:58:01,344 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-22 08:58:01,345 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 08:58:01" (1/1) ... [2019-10-22 08:58:01,348 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@516031e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 08:58:01, skipping insertion in model container [2019-10-22 08:58:01,348 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 08:58:01" (1/1) ... [2019-10-22 08:58:01,357 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-22 08:58:01,373 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-22 08:58:01,537 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-22 08:58:01,542 INFO L188 MainTranslator]: Completed pre-run [2019-10-22 08:58:01,669 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-22 08:58:01,687 INFO L192 MainTranslator]: Completed translation [2019-10-22 08:58:01,687 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 08:58:01 WrapperNode [2019-10-22 08:58:01,687 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-22 08:58:01,688 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-10-22 08:58:01,688 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-10-22 08:58:01,688 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-10-22 08:58:01,698 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 08:58:01" (1/1) ... [2019-10-22 08:58:01,704 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 08:58:01" (1/1) ... [2019-10-22 08:58:01,725 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-10-22 08:58:01,725 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-22 08:58:01,726 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-22 08:58:01,726 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-22 08:58:01,733 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 08:58:01" (1/1) ... [2019-10-22 08:58:01,733 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 08:58:01" (1/1) ... [2019-10-22 08:58:01,734 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 08:58:01" (1/1) ... [2019-10-22 08:58:01,734 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 08:58:01" (1/1) ... [2019-10-22 08:58:01,736 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 08:58:01" (1/1) ... [2019-10-22 08:58:01,738 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 08:58:01" (1/1) ... [2019-10-22 08:58:01,739 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 08:58:01" (1/1) ... [2019-10-22 08:58:01,740 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-22 08:58:01,740 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-22 08:58:01,741 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-22 08:58:01,741 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-22 08:58:01,742 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 08:58:01" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_17a10a26-abef-4763-9406-df6e57a17648/bin/uautomizer/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 [2019-10-22 08:58:01,799 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2019-10-22 08:58:01,799 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2019-10-22 08:58:01,800 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-22 08:58:01,800 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-22 08:58:01,800 INFO L130 BoogieDeclarations]: Found specification of procedure id [2019-10-22 08:58:01,800 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2019-10-22 08:58:01,960 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-22 08:58:01,961 INFO L284 CfgBuilder]: Removed 4 assume(true) statements. [2019-10-22 08:58:01,962 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 08:58:01 BoogieIcfgContainer [2019-10-22 08:58:01,962 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-22 08:58:01,963 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-22 08:58:01,963 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-22 08:58:01,967 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-22 08:58:01,967 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 08:58:01" (1/3) ... [2019-10-22 08:58:01,968 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@735e8f35 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 08:58:01, skipping insertion in model container [2019-10-22 08:58:01,971 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 08:58:01" (2/3) ... [2019-10-22 08:58:01,971 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@735e8f35 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 08:58:01, skipping insertion in model container [2019-10-22 08:58:01,972 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 08:58:01" (3/3) ... [2019-10-22 08:58:01,973 INFO L109 eAbstractionObserver]: Analyzing ICFG id2_i5_o5-1.c [2019-10-22 08:58:01,996 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-22 08:58:02,004 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-22 08:58:02,026 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-22 08:58:02,088 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-22 08:58:02,089 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-22 08:58:02,089 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-22 08:58:02,089 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-22 08:58:02,089 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-22 08:58:02,089 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-22 08:58:02,089 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-22 08:58:02,089 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-22 08:58:02,120 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2019-10-22 08:58:02,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-10-22 08:58:02,142 INFO L372 BasicCegarLoop]: Found error trace [2019-10-22 08:58:02,143 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 08:58:02,145 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-22 08:58:02,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:58:02,162 INFO L82 PathProgramCache]: Analyzing trace with hash 2105267373, now seen corresponding path program 1 times [2019-10-22 08:58:02,172 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 08:58:02,172 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1392564863] [2019-10-22 08:58:02,172 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:58:02,172 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:58:02,173 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 08:58:02,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:58:02,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:58:02,407 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-22 08:58:02,408 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1392564863] [2019-10-22 08:58:02,408 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-22 08:58:02,409 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2019-10-22 08:58:02,409 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392294839] [2019-10-22 08:58:02,413 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-22 08:58:02,413 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-22 08:58:02,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-22 08:58:02,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2019-10-22 08:58:02,424 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 7 states. [2019-10-22 08:58:02,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-22 08:58:02,508 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2019-10-22 08:58:02,509 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-22 08:58:02,510 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 9 [2019-10-22 08:58:02,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-22 08:58:02,520 INFO L225 Difference]: With dead ends: 30 [2019-10-22 08:58:02,520 INFO L226 Difference]: Without dead ends: 20 [2019-10-22 08:58:02,523 INFO L600 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 [2019-10-22 08:58:02,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-10-22 08:58:02,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-10-22 08:58:02,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-10-22 08:58:02,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2019-10-22 08:58:02,564 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 9 [2019-10-22 08:58:02,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-22 08:58:02,565 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2019-10-22 08:58:02,565 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-22 08:58:02,565 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2019-10-22 08:58:02,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-22 08:58:02,567 INFO L372 BasicCegarLoop]: Found error trace [2019-10-22 08:58:02,567 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 08:58:02,567 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-22 08:58:02,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:58:02,568 INFO L82 PathProgramCache]: Analyzing trace with hash -131148366, now seen corresponding path program 1 times [2019-10-22 08:58:02,568 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 08:58:02,568 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1426993900] [2019-10-22 08:58:02,568 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:58:02,568 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:58:02,568 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 08:58:02,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:58:02,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:58:02,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:58:02,706 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-22 08:58:02,707 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1426993900] [2019-10-22 08:58:02,707 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-22 08:58:02,707 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2019-10-22 08:58:02,707 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721924867] [2019-10-22 08:58:02,708 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-22 08:58:02,708 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-22 08:58:02,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-22 08:58:02,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2019-10-22 08:58:02,709 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 9 states. [2019-10-22 08:58:02,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-22 08:58:02,824 INFO L93 Difference]: Finished difference Result 29 states and 31 transitions. [2019-10-22 08:58:02,824 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-22 08:58:02,825 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 15 [2019-10-22 08:58:02,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-22 08:58:02,825 INFO L225 Difference]: With dead ends: 29 [2019-10-22 08:58:02,826 INFO L226 Difference]: Without dead ends: 25 [2019-10-22 08:58:02,827 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2019-10-22 08:58:02,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-10-22 08:58:02,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2019-10-22 08:58:02,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-10-22 08:58:02,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2019-10-22 08:58:02,832 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 15 [2019-10-22 08:58:02,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-22 08:58:02,833 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2019-10-22 08:58:02,833 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-22 08:58:02,833 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2019-10-22 08:58:02,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-22 08:58:02,834 INFO L372 BasicCegarLoop]: Found error trace [2019-10-22 08:58:02,834 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 08:58:02,834 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-22 08:58:02,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:58:02,834 INFO L82 PathProgramCache]: Analyzing trace with hash -132605643, now seen corresponding path program 1 times [2019-10-22 08:58:02,835 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 08:58:02,835 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [333578498] [2019-10-22 08:58:02,835 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:58:02,835 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:58:02,835 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 08:58:02,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:58:02,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:58:02,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:58:02,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:58:02,992 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-22 08:58:02,992 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [333578498] [2019-10-22 08:58:02,993 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [393051896] [2019-10-22 08:58:02,993 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_17a10a26-abef-4763-9406-df6e57a17648/bin/uautomizer/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 [2019-10-22 08:58:03,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:58:03,046 INFO L256 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-22 08:58:03,051 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 08:58:03,139 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-22 08:58:03,139 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-22 08:58:03,140 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 13 [2019-10-22 08:58:03,140 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512441752] [2019-10-22 08:58:03,140 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-22 08:58:03,140 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-22 08:58:03,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-22 08:58:03,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2019-10-22 08:58:03,141 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 13 states. [2019-10-22 08:58:03,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-22 08:58:03,280 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2019-10-22 08:58:03,281 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-22 08:58:03,281 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 21 [2019-10-22 08:58:03,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-22 08:58:03,282 INFO L225 Difference]: With dead ends: 35 [2019-10-22 08:58:03,282 INFO L226 Difference]: Without dead ends: 31 [2019-10-22 08:58:03,283 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2019-10-22 08:58:03,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-10-22 08:58:03,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 26. [2019-10-22 08:58:03,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-10-22 08:58:03,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2019-10-22 08:58:03,289 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 21 [2019-10-22 08:58:03,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-22 08:58:03,290 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2019-10-22 08:58:03,290 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-22 08:58:03,290 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2019-10-22 08:58:03,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-22 08:58:03,291 INFO L372 BasicCegarLoop]: Found error trace [2019-10-22 08:58:03,291 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 08:58:03,492 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-22 08:58:03,492 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-22 08:58:03,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:58:03,493 INFO L82 PathProgramCache]: Analyzing trace with hash -614490246, now seen corresponding path program 1 times [2019-10-22 08:58:03,493 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 08:58:03,493 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [526525531] [2019-10-22 08:58:03,493 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:58:03,494 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:58:03,494 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 08:58:03,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:58:03,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:58:03,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:58:03,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:58:03,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:58:03,720 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-10-22 08:58:03,721 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [526525531] [2019-10-22 08:58:03,721 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [304549823] [2019-10-22 08:58:03,721 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_17a10a26-abef-4763-9406-df6e57a17648/bin/uautomizer/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 [2019-10-22 08:58:03,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:58:03,761 INFO L256 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-22 08:58:03,763 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 08:58:03,819 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2019-10-22 08:58:03,819 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-22 08:58:03,820 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 14 [2019-10-22 08:58:03,820 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969826441] [2019-10-22 08:58:03,820 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-22 08:58:03,821 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-22 08:58:03,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-22 08:58:03,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2019-10-22 08:58:03,821 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 14 states. [2019-10-22 08:58:03,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-22 08:58:03,931 INFO L93 Difference]: Finished difference Result 41 states and 43 transitions. [2019-10-22 08:58:03,932 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-22 08:58:03,932 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 27 [2019-10-22 08:58:03,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-22 08:58:03,933 INFO L225 Difference]: With dead ends: 41 [2019-10-22 08:58:03,933 INFO L226 Difference]: Without dead ends: 37 [2019-10-22 08:58:03,934 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2019-10-22 08:58:03,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-10-22 08:58:03,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 29. [2019-10-22 08:58:03,939 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-10-22 08:58:03,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2019-10-22 08:58:03,940 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 27 [2019-10-22 08:58:03,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-22 08:58:03,941 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2019-10-22 08:58:03,941 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-22 08:58:03,941 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2019-10-22 08:58:03,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-10-22 08:58:03,942 INFO L372 BasicCegarLoop]: Found error trace [2019-10-22 08:58:03,946 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 08:58:04,147 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-22 08:58:04,147 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-22 08:58:04,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:58:04,148 INFO L82 PathProgramCache]: Analyzing trace with hash -2127867459, now seen corresponding path program 2 times [2019-10-22 08:58:04,148 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 08:58:04,148 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1135098700] [2019-10-22 08:58:04,149 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:58:04,149 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:58:04,149 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 08:58:04,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:58:04,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:58:04,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:58:04,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:58:04,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:58:04,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 08:58:04,377 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-22 08:58:04,377 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1135098700] [2019-10-22 08:58:04,377 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1750213207] [2019-10-22 08:58:04,377 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_17a10a26-abef-4763-9406-df6e57a17648/bin/uautomizer/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 [2019-10-22 08:58:04,413 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-22 08:58:04,413 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-22 08:58:04,414 INFO L256 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-22 08:58:04,416 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 08:58:04,477 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-22 08:58:04,477 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-22 08:58:04,478 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 15 [2019-10-22 08:58:04,478 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [375727460] [2019-10-22 08:58:04,478 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-22 08:58:04,479 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-22 08:58:04,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-22 08:58:04,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=174, Unknown=0, NotChecked=0, Total=210 [2019-10-22 08:58:04,479 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 15 states. [2019-10-22 08:58:04,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-22 08:58:04,616 INFO L93 Difference]: Finished difference Result 47 states and 49 transitions. [2019-10-22 08:58:04,616 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-22 08:58:04,617 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 33 [2019-10-22 08:58:04,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-22 08:58:04,618 INFO L225 Difference]: With dead ends: 47 [2019-10-22 08:58:04,618 INFO L226 Difference]: Without dead ends: 43 [2019-10-22 08:58:04,618 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2019-10-22 08:58:04,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-10-22 08:58:04,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 32. [2019-10-22 08:58:04,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-10-22 08:58:04,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2019-10-22 08:58:04,625 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 33 [2019-10-22 08:58:04,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-22 08:58:04,625 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2019-10-22 08:58:04,625 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-22 08:58:04,626 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2019-10-22 08:58:04,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-10-22 08:58:04,627 INFO L372 BasicCegarLoop]: Found error trace [2019-10-22 08:58:04,627 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 08:58:04,827 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-22 08:58:04,828 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-22 08:58:04,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 08:58:04,828 INFO L82 PathProgramCache]: Analyzing trace with hash -1002836670, now seen corresponding path program 2 times [2019-10-22 08:58:04,829 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-22 08:58:04,829 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1834477635] [2019-10-22 08:58:04,829 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:58:04,829 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 08:58:04,829 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 08:58:04,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 08:58:04,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 08:58:04,866 INFO L168 tionRefinementEngine]: Strategy CAMEL found a feasible trace [2019-10-22 08:58:04,867 INFO L445 BasicCegarLoop]: Counterexample might be feasible [2019-10-22 08:58:04,897 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.10 08:58:04 BoogieIcfgContainer [2019-10-22 08:58:04,897 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-10-22 08:58:04,897 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-10-22 08:58:04,898 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-10-22 08:58:04,899 INFO L275 PluginConnector]: Witness Printer initialized [2019-10-22 08:58:04,899 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 08:58:01" (3/4) ... [2019-10-22 08:58:04,902 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-10-22 08:58:04,953 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_17a10a26-abef-4763-9406-df6e57a17648/bin/uautomizer/witness.graphml [2019-10-22 08:58:04,953 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-10-22 08:58:04,957 INFO L168 Benchmark]: Toolchain (without parser) took 3616.33 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 161.0 MB). Free memory was 944.5 MB in the beginning and 915.3 MB in the end (delta: 29.2 MB). Peak memory consumption was 190.2 MB. Max. memory is 11.5 GB. [2019-10-22 08:58:04,957 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 1.0 GB. Free memory is still 967.3 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-10-22 08:58:04,958 INFO L168 Benchmark]: CACSL2BoogieTranslator took 348.37 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 161.0 MB). Free memory was 944.5 MB in the beginning and 1.2 GB in the end (delta: -212.6 MB). Peak memory consumption was 22.8 MB. Max. memory is 11.5 GB. [2019-10-22 08:58:04,958 INFO L168 Benchmark]: Boogie Procedure Inliner took 37.12 ms. Allocated memory is still 1.2 GB. Free memory is still 1.2 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-10-22 08:58:04,958 INFO L168 Benchmark]: Boogie Preprocessor took 14.58 ms. Allocated memory is still 1.2 GB. Free memory is still 1.2 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-10-22 08:58:04,959 INFO L168 Benchmark]: RCFGBuilder took 221.91 ms. Allocated memory is still 1.2 GB. Free memory was 1.2 GB in the beginning and 1.1 GB in the end (delta: 19.7 MB). Peak memory consumption was 19.7 MB. Max. memory is 11.5 GB. [2019-10-22 08:58:04,959 INFO L168 Benchmark]: TraceAbstraction took 2933.69 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 920.7 MB in the end (delta: 216.8 MB). Peak memory consumption was 216.8 MB. Max. memory is 11.5 GB. [2019-10-22 08:58:04,960 INFO L168 Benchmark]: Witness Printer took 55.49 ms. Allocated memory is still 1.2 GB. Free memory was 920.7 MB in the beginning and 915.3 MB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. [2019-10-22 08:58:04,962 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 1.0 GB. Free memory is still 967.3 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 348.37 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 161.0 MB). Free memory was 944.5 MB in the beginning and 1.2 GB in the end (delta: -212.6 MB). Peak memory consumption was 22.8 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 37.12 ms. Allocated memory is still 1.2 GB. Free memory is still 1.2 GB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 14.58 ms. Allocated memory is still 1.2 GB. Free memory is still 1.2 GB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 221.91 ms. Allocated memory is still 1.2 GB. Free memory was 1.2 GB in the beginning and 1.1 GB in the end (delta: 19.7 MB). Peak memory consumption was 19.7 MB. Max. memory is 11.5 GB. * TraceAbstraction took 2933.69 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 920.7 MB in the end (delta: 216.8 MB). Peak memory consumption was 216.8 MB. Max. memory is 11.5 GB. * Witness Printer took 55.49 ms. Allocated memory is still 1.2 GB. Free memory was 920.7 MB in the beginning and 915.3 MB in the end (delta: 5.4 MB). Peak memory consumption was 5.4 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 21]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L18] int input = 5; [L19] CALL, EXPR id(input) VAL [\old(x)=5] [L8] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L9] CALL, EXPR id2(x-1) VAL [\old(x)=4] [L13] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L14] CALL, EXPR id(x-1) VAL [\old(x)=3] [L8] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L9] CALL, EXPR id2(x-1) VAL [\old(x)=2] [L13] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L14] CALL, EXPR id(x-1) VAL [\old(x)=1] [L8] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L9] CALL, EXPR id2(x-1) VAL [\old(x)=0] [L13] COND TRUE x==0 [L13] return 0; VAL [\old(x)=0, \result=0, x=0] [L9] RET, EXPR id2(x-1) VAL [\old(x)=1, id2(x-1)=0, x=1] [L9] return id2(x-1) + 1; [L14] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L14] return id(x-1) + 1; [L9] RET, EXPR id2(x-1) VAL [\old(x)=3, id2(x-1)=2, x=3] [L9] return id2(x-1) + 1; [L14] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L14] return id(x-1) + 1; [L9] RET, EXPR id2(x-1) VAL [\old(x)=5, id2(x-1)=4, x=5] [L9] return id2(x-1) + 1; [L19] RET, EXPR id(input) [L19] int result = id(input); [L20] COND TRUE result == 5 [L21] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 21 locations, 1 error locations. Result: UNSAFE, OverallTime: 2.8s, OverallIterations: 6, TraceHistogramMax: 3, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 71 SDtfs, 103 SDslu, 398 SDs, 0 SdLazy, 317 SolverSat, 26 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 158 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=32occurred 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, 0.1s SatisfiabilityAnalysisTime, 1.0s InterpolantComputationTime, 225 NumberOfCodeBlocks, 225 NumberOfCodeBlocksAsserted, 10 NumberOfCheckSat, 178 ConstructedInterpolants, 0 QuantifiedInterpolants, 11512 SizeOfPredicates, 15 NumberOfNonLiveVariables, 198 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, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...