./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/id_i15_o15-2.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_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/id_i15_o15-2.c -s /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan --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 Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash ad4e6ad99a266ddeead98987e8e44db723af5bc7 ........................................................................................................................................................................................................................................................................................................................... Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis Calling Ultimate with: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/id_i15_o15-2.c -s /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan --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 Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash ad4e6ad99a266ddeead98987e8e44db723af5bc7 ............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 11:24:52,362 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-22 11:24:52,364 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-22 11:24:52,377 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-22 11:24:52,377 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-22 11:24:52,378 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-22 11:24:52,379 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-22 11:24:52,381 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-22 11:24:52,383 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-22 11:24:52,384 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-22 11:24:52,384 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-22 11:24:52,392 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-22 11:24:52,392 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-22 11:24:52,393 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-22 11:24:52,393 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-22 11:24:52,394 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-22 11:24:52,395 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-22 11:24:52,396 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-22 11:24:52,397 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-22 11:24:52,398 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-22 11:24:52,399 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-22 11:24:52,400 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-22 11:24:52,401 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-22 11:24:52,402 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-22 11:24:52,404 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-22 11:24:52,404 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-22 11:24:52,404 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-22 11:24:52,405 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-22 11:24:52,405 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-22 11:24:52,406 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-22 11:24:52,408 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-22 11:24:52,408 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-22 11:24:52,409 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-22 11:24:52,409 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-22 11:24:52,410 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-22 11:24:52,413 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-22 11:24:52,414 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-22 11:24:52,414 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-22 11:24:52,414 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-22 11:24:52,415 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-22 11:24:52,415 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-22 11:24:52,416 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2019-10-22 11:24:52,426 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-22 11:24:52,427 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-22 11:24:52,427 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-10-22 11:24:52,428 INFO L138 SettingsManager]: * User list type=DISABLED [2019-10-22 11:24:52,428 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-10-22 11:24:52,428 INFO L138 SettingsManager]: * Explicit value domain=true [2019-10-22 11:24:52,428 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2019-10-22 11:24:52,428 INFO L138 SettingsManager]: * Octagon Domain=false [2019-10-22 11:24:52,429 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-10-22 11:24:52,429 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2019-10-22 11:24:52,429 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2019-10-22 11:24:52,429 INFO L138 SettingsManager]: * Interval Domain=false [2019-10-22 11:24:52,430 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-22 11:24:52,430 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-22 11:24:52,430 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-22 11:24:52,430 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-22 11:24:52,431 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-22 11:24:52,431 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-22 11:24:52,431 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-22 11:24:52,431 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-22 11:24:52,431 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-22 11:24:52,432 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-22 11:24:52,432 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-22 11:24:52,432 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-22 11:24:52,432 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-22 11:24:52,432 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-22 11:24:52,433 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-22 11:24:52,433 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-22 11:24:52,433 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-22 11:24:52,433 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-22 11:24:52,433 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-22 11:24:52,434 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-10-22 11:24:52,434 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-22 11:24:52,434 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-22 11:24:52,434 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-22 11:24:52,434 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan 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 -> Taipan 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 -> ad4e6ad99a266ddeead98987e8e44db723af5bc7 [2019-10-22 11:24:52,461 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-22 11:24:52,474 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-22 11:24:52,478 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-22 11:24:52,479 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-22 11:24:52,480 INFO L275 PluginConnector]: CDTParser initialized [2019-10-22 11:24:52,480 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/../../sv-benchmarks/c/recursive-simple/id_i15_o15-2.c [2019-10-22 11:24:52,539 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/data/bafc5e1cf/4d3babf8b84f46b9a9c2880186a9ab53/FLAGb54599574 [2019-10-22 11:24:52,926 INFO L306 CDTParser]: Found 1 translation units. [2019-10-22 11:24:52,927 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/sv-benchmarks/c/recursive-simple/id_i15_o15-2.c [2019-10-22 11:24:52,934 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/data/bafc5e1cf/4d3babf8b84f46b9a9c2880186a9ab53/FLAGb54599574 [2019-10-22 11:24:53,331 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/data/bafc5e1cf/4d3babf8b84f46b9a9c2880186a9ab53 [2019-10-22 11:24:53,333 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-22 11:24:53,335 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-10-22 11:24:53,336 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-22 11:24:53,336 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-22 11:24:53,340 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-22 11:24:53,340 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 11:24:53" (1/1) ... [2019-10-22 11:24:53,343 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4bf22eb1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:53, skipping insertion in model container [2019-10-22 11:24:53,343 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 11:24:53" (1/1) ... [2019-10-22 11:24:53,352 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-22 11:24:53,367 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-22 11:24:53,532 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-22 11:24:53,540 INFO L188 MainTranslator]: Completed pre-run [2019-10-22 11:24:53,622 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-22 11:24:53,638 INFO L192 MainTranslator]: Completed translation [2019-10-22 11:24:53,639 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:53 WrapperNode [2019-10-22 11:24:53,639 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-22 11:24:53,640 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-10-22 11:24:53,640 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-10-22 11:24:53,640 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-10-22 11:24:53,648 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:53" (1/1) ... [2019-10-22 11:24:53,652 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:53" (1/1) ... [2019-10-22 11:24:53,669 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-10-22 11:24:53,670 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-22 11:24:53,671 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-22 11:24:53,671 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-22 11:24:53,680 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:53" (1/1) ... [2019-10-22 11:24:53,680 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:53" (1/1) ... [2019-10-22 11:24:53,680 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:53" (1/1) ... [2019-10-22 11:24:53,681 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:53" (1/1) ... [2019-10-22 11:24:53,683 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:53" (1/1) ... [2019-10-22 11:24:53,686 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:53" (1/1) ... [2019-10-22 11:24:53,687 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:53" (1/1) ... [2019-10-22 11:24:53,688 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-22 11:24:53,688 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-22 11:24:53,688 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-22 11:24:53,688 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-22 11:24:53,689 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:53" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/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 11:24:53,742 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-22 11:24:53,742 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-22 11:24:53,742 INFO L130 BoogieDeclarations]: Found specification of procedure id [2019-10-22 11:24:53,742 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2019-10-22 11:24:53,856 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-22 11:24:53,856 INFO L284 CfgBuilder]: Removed 4 assume(true) statements. [2019-10-22 11:24:53,857 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 11:24:53 BoogieIcfgContainer [2019-10-22 11:24:53,857 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-22 11:24:53,858 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-22 11:24:53,858 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-22 11:24:53,861 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-22 11:24:53,861 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 11:24:53" (1/3) ... [2019-10-22 11:24:53,862 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6641dd31 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 11:24:53, skipping insertion in model container [2019-10-22 11:24:53,862 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:53" (2/3) ... [2019-10-22 11:24:53,862 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6641dd31 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 11:24:53, skipping insertion in model container [2019-10-22 11:24:53,863 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 11:24:53" (3/3) ... [2019-10-22 11:24:53,864 INFO L109 eAbstractionObserver]: Analyzing ICFG id_i15_o15-2.c [2019-10-22 11:24:53,870 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-22 11:24:53,875 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-22 11:24:53,884 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-22 11:24:53,902 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-22 11:24:53,902 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-22 11:24:53,902 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-22 11:24:53,902 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-22 11:24:53,903 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-22 11:24:53,903 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-22 11:24:53,903 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-22 11:24:53,903 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-22 11:24:53,915 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states. [2019-10-22 11:24:53,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-10-22 11:24:53,919 INFO L372 BasicCegarLoop]: Found error trace [2019-10-22 11:24:53,920 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 11:24:53,921 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-22 11:24:53,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 11:24:53,925 INFO L82 PathProgramCache]: Analyzing trace with hash 389977641, now seen corresponding path program 1 times [2019-10-22 11:24:53,933 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-22 11:24:53,933 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [336953819] [2019-10-22 11:24:53,933 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 11:24:53,934 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 11:24:53,934 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 11:24:53,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 11:24:54,255 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 11:24:54,256 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [336953819] [2019-10-22 11:24:54,257 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-22 11:24:54,258 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2019-10-22 11:24:54,258 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88363207] [2019-10-22 11:24:54,262 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-22 11:24:54,265 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy TAIPAN [2019-10-22 11:24:54,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-22 11:24:54,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2019-10-22 11:24:54,280 INFO L87 Difference]: Start difference. First operand 15 states. Second operand 7 states. [2019-10-22 11:24:54,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-22 11:24:54,396 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2019-10-22 11:24:54,397 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-22 11:24:54,398 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 9 [2019-10-22 11:24:54,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-22 11:24:54,407 INFO L225 Difference]: With dead ends: 27 [2019-10-22 11:24:54,407 INFO L226 Difference]: Without dead ends: 14 [2019-10-22 11:24:54,410 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2019-10-22 11:24:54,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-10-22 11:24:54,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-10-22 11:24:54,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-10-22 11:24:54,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2019-10-22 11:24:54,446 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 9 [2019-10-22 11:24:54,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-22 11:24:54,447 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2019-10-22 11:24:54,447 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-22 11:24:54,447 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2019-10-22 11:24:54,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-22 11:24:54,449 INFO L372 BasicCegarLoop]: Found error trace [2019-10-22 11:24:54,449 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 11:24:54,449 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-22 11:24:54,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 11:24:54,449 INFO L82 PathProgramCache]: Analyzing trace with hash -881029229, now seen corresponding path program 1 times [2019-10-22 11:24:54,450 INFO L157 tionRefinementEngine]: Executing refinement strategy TAIPAN [2019-10-22 11:24:54,450 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1209144590] [2019-10-22 11:24:54,450 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 11:24:54,450 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-22 11:24:54,450 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-22 11:24:54,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 11:24:54,526 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 11:24:54,526 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1209144590] [2019-10-22 11:24:54,526 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1199146729] [2019-10-22 11:24:54,527 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/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 11:24:54,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 11:24:54,561 INFO L256 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-22 11:24:54,565 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 11:24:54,631 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 11:24:54,631 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-22 11:24:54,755 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:24:54,788 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-22 11:24:54,788 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleAbstractInterpretation [1118808208] [2019-10-22 11:24:54,794 INFO L211 CegarAbsIntRunner]: Running AI on error trace of length 16 [2019-10-22 11:24:54,832 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, ExplicitValueDomain] [2019-10-22 11:24:54,832 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2019-10-22 11:24:55,090 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-22 11:24:55,091 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.AssertionError: inappropriate decl info IMPLEMENTATION at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.boogie.Boogie2SmtSymbolTable.getBoogieVar(Boogie2SmtSymbolTable.java:222) at de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2.domain.nonrelational.NonrelationalStatementProcessor.getBoogieVar(NonrelationalStatementProcessor.java:348) at de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2.domain.nonrelational.NonrelationalStatementProcessor.handleHavocStatement(NonrelationalStatementProcessor.java:325) at de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2.domain.nonrelational.NonrelationalStatementProcessor.processStatement(NonrelationalStatementProcessor.java:159) at de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2.domain.nonrelational.NonrelationalStatementProcessor.process(NonrelationalStatementProcessor.java:138) at de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2.domain.nonrelational.NonrelationalStatementProcessor.process(NonrelationalStatementProcessor.java:107) at de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2.domain.nonrelational.NonrelationalPostOperator.handleInternalTransition(NonrelationalPostOperator.java:422) at de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2.domain.nonrelational.NonrelationalPostOperator.handleInternalTransition(NonrelationalPostOperator.java:413) at de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2.domain.nonrelational.NonrelationalPostOperator.apply(NonrelationalPostOperator.java:140) at de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2.domain.nonrelational.NonrelationalPostOperator.apply(NonrelationalPostOperator.java:1) at de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2.domain.compound.CompoundDomainPostOperator.applyInternally(CompoundDomainPostOperator.java:306) at de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2.domain.compound.CompoundDomainPostOperator.apply(CompoundDomainPostOperator.java:131) at de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2.domain.compound.CompoundDomainPostOperator.apply(CompoundDomainPostOperator.java:1) at de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2.domain.transformula.poorman.PoormanCachedPostOperation.restoreOriginalStateVariables(PoormanCachedPostOperation.java:322) at de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2.domain.transformula.poorman.PoormansAbstractPostOperator.applyPost(PoormansAbstractPostOperator.java:217) at de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2.domain.transformula.poorman.PoormansAbstractPostOperator.apply(PoormansAbstractPostOperator.java:120) at de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2.domain.transformula.poorman.PoormansAbstractPostOperator.apply(PoormansAbstractPostOperator.java:1) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.absint.DisjunctiveAbstractState.lambda$17(DisjunctiveAbstractState.java:323) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.absint.DisjunctiveAbstractState.mapCollection(DisjunctiveAbstractState.java:519) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.absint.DisjunctiveAbstractState.apply(DisjunctiveAbstractState.java:323) at de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2.algorithm.FixpointEngine.calculateAbstractPost(FixpointEngine.java:249) at de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2.algorithm.FixpointEngine.calculateFixpoint(FixpointEngine.java:134) at de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2.algorithm.FixpointEngine.run(FixpointEngine.java:105) at de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2.tool.AbstractInterpreter.runWithoutTimeoutAndResults(AbstractInterpreter.java:149) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarAbsIntRunner.generateFixpoints(CegarAbsIntRunner.java:227) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarAbsIntRunner.(CegarAbsIntRunner.java:158) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleAbstractInterpretation.getOrConstructRunner(IpTcStrategyModuleAbstractInterpretation.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleAbstractInterpretation.construct(IpTcStrategyModuleAbstractInterpretation.java:81) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.tryExecuteInterpolantGenerator(TraceAbstractionRefinementEngine.java:299) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.generateProof(TraceAbstractionRefinementEngine.java:184) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.executeStrategy(TraceAbstractionRefinementEngine.java:174) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.RefinementEngineFactory.runRefinementEngine(RefinementEngineFactory.java:124) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:419) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:368) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterate(TraceAbstractionStarter.java:332) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:170) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:122) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:120) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:316) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55) [2019-10-22 11:24:55,096 INFO L168 Benchmark]: Toolchain (without parser) took 1760.85 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 124.8 MB). Free memory was 939.6 MB in the beginning and 1.0 GB in the end (delta: -81.9 MB). Peak memory consumption was 42.9 MB. Max. memory is 11.5 GB. [2019-10-22 11:24:55,097 INFO L168 Benchmark]: CDTParser took 0.16 ms. Allocated memory is still 1.0 GB. Free memory is still 963.8 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-10-22 11:24:55,097 INFO L168 Benchmark]: CACSL2BoogieTranslator took 303.34 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 124.8 MB). Free memory was 939.6 MB in the beginning and 1.1 GB in the end (delta: -179.9 MB). Peak memory consumption was 23.2 MB. Max. memory is 11.5 GB. [2019-10-22 11:24:55,098 INFO L168 Benchmark]: Boogie Procedure Inliner took 30.56 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-10-22 11:24:55,098 INFO L168 Benchmark]: Boogie Preprocessor took 17.42 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. [2019-10-22 11:24:55,099 INFO L168 Benchmark]: RCFGBuilder took 169.18 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 17.0 MB). Peak memory consumption was 17.0 MB. Max. memory is 11.5 GB. [2019-10-22 11:24:55,099 INFO L168 Benchmark]: TraceAbstraction took 1236.29 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 81.0 MB). Peak memory consumption was 81.0 MB. Max. memory is 11.5 GB. [2019-10-22 11:24:55,102 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16 ms. Allocated memory is still 1.0 GB. Free memory is still 963.8 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 303.34 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 124.8 MB). Free memory was 939.6 MB in the beginning and 1.1 GB in the end (delta: -179.9 MB). Peak memory consumption was 23.2 MB. Max. memory is 11.5 GB. * Boogie Procedure Inliner took 30.56 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 17.42 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB. * RCFGBuilder took 169.18 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 17.0 MB). Peak memory consumption was 17.0 MB. Max. memory is 11.5 GB. * TraceAbstraction took 1236.29 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 81.0 MB). Peak memory consumption was 81.0 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: AssertionError: inappropriate decl info IMPLEMENTATION de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: AssertionError: inappropriate decl info IMPLEMENTATION: de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.boogie.Boogie2SmtSymbolTable.getBoogieVar(Boogie2SmtSymbolTable.java:222) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... ### Bit-precise run ### This is Ultimate 0.1.24-cad4683 [2019-10-22 11:24:57,168 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-22 11:24:57,170 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-22 11:24:57,181 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-22 11:24:57,181 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-22 11:24:57,182 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-22 11:24:57,183 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-22 11:24:57,184 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-22 11:24:57,186 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-22 11:24:57,186 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-22 11:24:57,187 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-22 11:24:57,188 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-22 11:24:57,188 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-22 11:24:57,189 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-22 11:24:57,190 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-22 11:24:57,191 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-22 11:24:57,192 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-22 11:24:57,192 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-22 11:24:57,194 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-22 11:24:57,195 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-22 11:24:57,196 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-22 11:24:57,197 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-22 11:24:57,198 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-22 11:24:57,199 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-22 11:24:57,201 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-22 11:24:57,201 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-22 11:24:57,201 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-22 11:24:57,202 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-22 11:24:57,202 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-22 11:24:57,203 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-22 11:24:57,203 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-22 11:24:57,203 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-22 11:24:57,204 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-22 11:24:57,205 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-22 11:24:57,205 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-22 11:24:57,206 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-22 11:24:57,206 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-22 11:24:57,206 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-22 11:24:57,206 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-22 11:24:57,207 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-22 11:24:57,208 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-22 11:24:57,208 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2019-10-22 11:24:57,219 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-22 11:24:57,219 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-22 11:24:57,220 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-10-22 11:24:57,220 INFO L138 SettingsManager]: * User list type=DISABLED [2019-10-22 11:24:57,220 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-10-22 11:24:57,220 INFO L138 SettingsManager]: * Explicit value domain=true [2019-10-22 11:24:57,220 INFO L138 SettingsManager]: * Octagon Domain=false [2019-10-22 11:24:57,221 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2019-10-22 11:24:57,221 INFO L138 SettingsManager]: * Interval Domain=false [2019-10-22 11:24:57,221 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-22 11:24:57,221 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-22 11:24:57,222 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-22 11:24:57,222 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-22 11:24:57,222 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-22 11:24:57,222 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-22 11:24:57,222 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-22 11:24:57,222 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2019-10-22 11:24:57,222 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2019-10-22 11:24:57,222 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-22 11:24:57,223 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-22 11:24:57,223 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-22 11:24:57,223 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-22 11:24:57,223 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-22 11:24:57,223 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-22 11:24:57,223 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-22 11:24:57,223 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-22 11:24:57,224 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-22 11:24:57,224 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-22 11:24:57,224 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-22 11:24:57,224 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-22 11:24:57,224 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2019-10-22 11:24:57,224 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --rewrite-divk --print-success --lang smt [2019-10-22 11:24:57,224 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-22 11:24:57,224 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-22 11:24:57,225 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan 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 -> Taipan 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 -> ad4e6ad99a266ddeead98987e8e44db723af5bc7 [2019-10-22 11:24:57,267 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-22 11:24:57,280 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-22 11:24:57,283 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-22 11:24:57,284 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-22 11:24:57,284 INFO L275 PluginConnector]: CDTParser initialized [2019-10-22 11:24:57,285 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/../../sv-benchmarks/c/recursive-simple/id_i15_o15-2.c [2019-10-22 11:24:57,337 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/data/0b29c559d/9e508d4e13b54c2cb7fa6c1992562199/FLAGc957c9f13 [2019-10-22 11:24:57,703 INFO L306 CDTParser]: Found 1 translation units. [2019-10-22 11:24:57,703 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/sv-benchmarks/c/recursive-simple/id_i15_o15-2.c [2019-10-22 11:24:57,707 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/data/0b29c559d/9e508d4e13b54c2cb7fa6c1992562199/FLAGc957c9f13 [2019-10-22 11:24:58,087 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/data/0b29c559d/9e508d4e13b54c2cb7fa6c1992562199 [2019-10-22 11:24:58,091 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-22 11:24:58,092 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2019-10-22 11:24:58,093 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-22 11:24:58,093 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-22 11:24:58,098 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-22 11:24:58,099 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 11:24:58" (1/1) ... [2019-10-22 11:24:58,102 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2905f4c7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:58, skipping insertion in model container [2019-10-22 11:24:58,102 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.10 11:24:58" (1/1) ... [2019-10-22 11:24:58,108 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-22 11:24:58,123 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-22 11:24:58,256 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-22 11:24:58,260 INFO L188 MainTranslator]: Completed pre-run [2019-10-22 11:24:58,274 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-22 11:24:58,288 INFO L192 MainTranslator]: Completed translation [2019-10-22 11:24:58,289 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:58 WrapperNode [2019-10-22 11:24:58,290 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-22 11:24:58,290 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2019-10-22 11:24:58,291 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2019-10-22 11:24:58,291 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2019-10-22 11:24:58,298 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:58" (1/1) ... [2019-10-22 11:24:58,304 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:58" (1/1) ... [2019-10-22 11:24:58,325 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2019-10-22 11:24:58,326 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-22 11:24:58,327 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-22 11:24:58,327 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-22 11:24:58,396 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:58" (1/1) ... [2019-10-22 11:24:58,397 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:58" (1/1) ... [2019-10-22 11:24:58,397 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:58" (1/1) ... [2019-10-22 11:24:58,398 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:58" (1/1) ... [2019-10-22 11:24:58,401 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:58" (1/1) ... [2019-10-22 11:24:58,402 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:58" (1/1) ... [2019-10-22 11:24:58,403 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:58" (1/1) ... [2019-10-22 11:24:58,404 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-22 11:24:58,405 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-22 11:24:58,405 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-22 11:24:58,405 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-22 11:24:58,405 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:58" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/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 11:24:58,459 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-22 11:24:58,459 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-22 11:24:58,459 INFO L130 BoogieDeclarations]: Found specification of procedure id [2019-10-22 11:24:58,459 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2019-10-22 11:24:58,595 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-22 11:24:58,595 INFO L284 CfgBuilder]: Removed 4 assume(true) statements. [2019-10-22 11:24:58,596 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 11:24:58 BoogieIcfgContainer [2019-10-22 11:24:58,596 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-22 11:24:58,597 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-22 11:24:58,597 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-22 11:24:58,601 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-22 11:24:58,602 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.10 11:24:58" (1/3) ... [2019-10-22 11:24:58,602 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@725c94d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 11:24:58, skipping insertion in model container [2019-10-22 11:24:58,602 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.10 11:24:58" (2/3) ... [2019-10-22 11:24:58,603 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@725c94d1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.10 11:24:58, skipping insertion in model container [2019-10-22 11:24:58,603 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 11:24:58" (3/3) ... [2019-10-22 11:24:58,604 INFO L109 eAbstractionObserver]: Analyzing ICFG id_i15_o15-2.c [2019-10-22 11:24:58,612 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-22 11:24:58,619 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-22 11:24:58,628 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-22 11:24:58,650 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-22 11:24:58,650 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-22 11:24:58,650 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-22 11:24:58,651 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-22 11:24:58,651 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-22 11:24:58,651 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-22 11:24:58,651 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-22 11:24:58,651 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-22 11:24:58,668 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states. [2019-10-22 11:24:58,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2019-10-22 11:24:58,675 INFO L372 BasicCegarLoop]: Found error trace [2019-10-22 11:24:58,676 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 11:24:58,678 INFO L410 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-22 11:24:58,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 11:24:58,683 INFO L82 PathProgramCache]: Analyzing trace with hash 389977641, now seen corresponding path program 1 times [2019-10-22 11:24:58,693 INFO L157 tionRefinementEngine]: Executing refinement strategy WALRUS [2019-10-22 11:24:58,693 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [169212753] [2019-10-22 11:24:58,694 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/cvc4 Starting monitored process 2 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-10-22 11:24:58,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 11:24:58,802 INFO L256 TraceCheckSpWp]: Trace formula consists of 14 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-22 11:24:58,806 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 11:24:58,873 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 11:24:58,873 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-22 11:24:58,960 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 11:24:58,961 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [169212753] [2019-10-22 11:24:58,962 INFO L223 tionRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-10-22 11:24:58,962 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 7 [2019-10-22 11:24:58,962 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657129287] [2019-10-22 11:24:58,969 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-22 11:24:58,969 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2019-10-22 11:24:58,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-22 11:24:58,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2019-10-22 11:24:58,984 INFO L87 Difference]: Start difference. First operand 15 states. Second operand 7 states. [2019-10-22 11:24:59,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-22 11:24:59,060 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2019-10-22 11:24:59,061 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-22 11:24:59,063 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 9 [2019-10-22 11:24:59,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-22 11:24:59,071 INFO L225 Difference]: With dead ends: 24 [2019-10-22 11:24:59,071 INFO L226 Difference]: Without dead ends: 14 [2019-10-22 11:24:59,074 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-10-22 11:24:59,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2019-10-22 11:24:59,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2019-10-22 11:24:59,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2019-10-22 11:24:59,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2019-10-22 11:24:59,109 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 9 [2019-10-22 11:24:59,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-22 11:24:59,110 INFO L462 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2019-10-22 11:24:59,110 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-22 11:24:59,110 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2019-10-22 11:24:59,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-22 11:24:59,111 INFO L372 BasicCegarLoop]: Found error trace [2019-10-22 11:24:59,112 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 11:24:59,312 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-10-22 11:24:59,312 INFO L410 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-22 11:24:59,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 11:24:59,313 INFO L82 PathProgramCache]: Analyzing trace with hash -881029229, now seen corresponding path program 1 times [2019-10-22 11:24:59,313 INFO L157 tionRefinementEngine]: Executing refinement strategy WALRUS [2019-10-22 11:24:59,313 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1052862431] [2019-10-22 11:24:59,313 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/cvc4 Starting monitored process 3 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-10-22 11:24:59,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 11:24:59,349 INFO L256 TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-22 11:24:59,353 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 11:24:59,387 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 11:24:59,387 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-22 11:24:59,553 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:24:59,581 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-22 11:24:59,581 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1052862431] [2019-10-22 11:24:59,581 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1711061033] [2019-10-22 11:24:59,582 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/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 11:24:59,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 11:24:59,617 INFO L256 TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-22 11:24:59,618 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 11:24:59,626 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 11:24:59,632 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-22 11:24:59,752 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:24:59,757 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-22 11:24:59,763 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-22 11:24:59,763 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 6, 7] total 9 [2019-10-22 11:24:59,763 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837794723] [2019-10-22 11:24:59,765 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-22 11:24:59,765 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2019-10-22 11:24:59,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-22 11:24:59,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2019-10-22 11:24:59,766 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 9 states. [2019-10-22 11:24:59,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-22 11:24:59,848 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2019-10-22 11:24:59,849 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-22 11:24:59,850 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 15 [2019-10-22 11:24:59,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-22 11:24:59,851 INFO L225 Difference]: With dead ends: 21 [2019-10-22 11:24:59,851 INFO L226 Difference]: Without dead ends: 17 [2019-10-22 11:24:59,852 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2019-10-22 11:24:59,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2019-10-22 11:24:59,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2019-10-22 11:24:59,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2019-10-22 11:24:59,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2019-10-22 11:24:59,861 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 15 [2019-10-22 11:24:59,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-22 11:24:59,861 INFO L462 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2019-10-22 11:24:59,862 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-22 11:24:59,862 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2019-10-22 11:24:59,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-22 11:24:59,865 INFO L372 BasicCegarLoop]: Found error trace [2019-10-22 11:24:59,865 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 11:25:00,266 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 cvc4 --incremental --print-success --lang smt --rewrite-divk,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-22 11:25:00,267 INFO L410 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-22 11:25:00,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 11:25:00,267 INFO L82 PathProgramCache]: Analyzing trace with hash -1824240471, now seen corresponding path program 2 times [2019-10-22 11:25:00,267 INFO L157 tionRefinementEngine]: Executing refinement strategy WALRUS [2019-10-22 11:25:00,267 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1252206700] [2019-10-22 11:25:00,268 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/cvc4 Starting monitored process 5 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-10-22 11:25:00,299 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-22 11:25:00,299 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-22 11:25:00,300 INFO L256 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-22 11:25:00,301 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 11:25:00,345 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-10-22 11:25:00,346 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-22 11:25:00,516 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:00,559 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:00,584 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-22 11:25:00,584 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1252206700] [2019-10-22 11:25:00,585 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1170594882] [2019-10-22 11:25:00,585 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/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 [2019-10-22 11:25:00,613 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-22 11:25:00,613 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-22 11:25:00,614 INFO L256 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-22 11:25:00,615 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 11:25:00,627 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-10-22 11:25:00,629 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-22 11:25:00,781 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:00,810 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:00,815 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-22 11:25:00,815 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-22 11:25:00,815 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 7, 9] total 11 [2019-10-22 11:25:00,816 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088185463] [2019-10-22 11:25:00,816 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-22 11:25:00,816 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2019-10-22 11:25:00,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-22 11:25:00,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2019-10-22 11:25:00,817 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 11 states. [2019-10-22 11:25:00,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-22 11:25:00,914 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2019-10-22 11:25:00,914 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-22 11:25:00,915 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 21 [2019-10-22 11:25:00,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-22 11:25:00,915 INFO L225 Difference]: With dead ends: 24 [2019-10-22 11:25:00,916 INFO L226 Difference]: Without dead ends: 20 [2019-10-22 11:25:00,916 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182 [2019-10-22 11:25:00,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-10-22 11:25:00,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-10-22 11:25:00,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-10-22 11:25:00,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2019-10-22 11:25:00,921 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 21 [2019-10-22 11:25:00,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-22 11:25:00,921 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2019-10-22 11:25:00,921 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-22 11:25:00,921 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2019-10-22 11:25:00,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-22 11:25:00,922 INFO L372 BasicCegarLoop]: Found error trace [2019-10-22 11:25:00,922 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 11:25:01,323 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 cvc4 --incremental --print-success --lang smt --rewrite-divk,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-22 11:25:01,324 INFO L410 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-22 11:25:01,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 11:25:01,324 INFO L82 PathProgramCache]: Analyzing trace with hash -28473709, now seen corresponding path program 3 times [2019-10-22 11:25:01,325 INFO L157 tionRefinementEngine]: Executing refinement strategy WALRUS [2019-10-22 11:25:01,325 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1467660941] [2019-10-22 11:25:01,325 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/cvc4 Starting monitored process 7 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-10-22 11:25:01,383 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-10-22 11:25:01,383 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-22 11:25:01,385 INFO L256 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-22 11:25:01,386 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 11:25:01,443 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-10-22 11:25:01,443 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-22 11:25:01,671 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:01,752 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:01,789 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:01,804 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-22 11:25:01,805 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1467660941] [2019-10-22 11:25:01,805 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [560962471] [2019-10-22 11:25:01,805 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/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 [2019-10-22 11:25:01,848 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-10-22 11:25:01,848 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-22 11:25:01,849 INFO L256 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-22 11:25:01,851 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 11:25:01,857 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-10-22 11:25:01,858 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-22 11:25:02,055 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:02,102 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:02,149 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:02,159 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-22 11:25:02,162 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-22 11:25:02,162 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11, 8, 11] total 13 [2019-10-22 11:25:02,162 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [71801934] [2019-10-22 11:25:02,163 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-22 11:25:02,163 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2019-10-22 11:25:02,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-22 11:25:02,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2019-10-22 11:25:02,164 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 13 states. [2019-10-22 11:25:02,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-22 11:25:02,278 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2019-10-22 11:25:02,278 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-22 11:25:02,279 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 27 [2019-10-22 11:25:02,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-22 11:25:02,279 INFO L225 Difference]: With dead ends: 27 [2019-10-22 11:25:02,280 INFO L226 Difference]: Without dead ends: 23 [2019-10-22 11:25:02,280 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2019-10-22 11:25:02,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-10-22 11:25:02,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2019-10-22 11:25:02,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-10-22 11:25:02,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2019-10-22 11:25:02,284 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 27 [2019-10-22 11:25:02,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-22 11:25:02,285 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2019-10-22 11:25:02,285 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-22 11:25:02,285 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2019-10-22 11:25:02,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-10-22 11:25:02,286 INFO L372 BasicCegarLoop]: Found error trace [2019-10-22 11:25:02,286 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 11:25:02,686 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 cvc4 --incremental --print-success --lang smt --rewrite-divk,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-22 11:25:02,687 INFO L410 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-22 11:25:02,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 11:25:02,687 INFO L82 PathProgramCache]: Analyzing trace with hash -2080894167, now seen corresponding path program 4 times [2019-10-22 11:25:02,688 INFO L157 tionRefinementEngine]: Executing refinement strategy WALRUS [2019-10-22 11:25:02,688 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1659145368] [2019-10-22 11:25:02,688 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/cvc4 Starting monitored process 9 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-10-22 11:25:02,729 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-22 11:25:02,729 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-22 11:25:02,730 INFO L256 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-22 11:25:02,731 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 11:25:02,775 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-10-22 11:25:02,776 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-22 11:25:03,033 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:03,115 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:03,178 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:03,226 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:03,244 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-22 11:25:03,245 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1659145368] [2019-10-22 11:25:03,245 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1793691711] [2019-10-22 11:25:03,245 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-22 11:25:03,283 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-22 11:25:03,283 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-22 11:25:03,284 INFO L256 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-22 11:25:03,285 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 11:25:03,292 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-10-22 11:25:03,292 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-22 11:25:03,493 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:03,564 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:03,613 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:03,645 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:03,648 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-22 11:25:03,649 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-22 11:25:03,649 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13, 9, 13] total 15 [2019-10-22 11:25:03,649 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073127944] [2019-10-22 11:25:03,649 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-22 11:25:03,649 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2019-10-22 11:25:03,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-22 11:25:03,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2019-10-22 11:25:03,650 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 15 states. [2019-10-22 11:25:03,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-22 11:25:03,774 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2019-10-22 11:25:03,774 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-22 11:25:03,774 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 33 [2019-10-22 11:25:03,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-22 11:25:03,775 INFO L225 Difference]: With dead ends: 30 [2019-10-22 11:25:03,775 INFO L226 Difference]: Without dead ends: 26 [2019-10-22 11:25:03,776 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 115 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=83, Invalid=297, Unknown=0, NotChecked=0, Total=380 [2019-10-22 11:25:03,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-10-22 11:25:03,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-10-22 11:25:03,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-10-22 11:25:03,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2019-10-22 11:25:03,780 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 33 [2019-10-22 11:25:03,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-22 11:25:03,780 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2019-10-22 11:25:03,780 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-22 11:25:03,780 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2019-10-22 11:25:03,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-10-22 11:25:03,781 INFO L372 BasicCegarLoop]: Found error trace [2019-10-22 11:25:03,781 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 11:25:04,182 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 cvc4 --incremental --print-success --lang smt --rewrite-divk,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-22 11:25:04,182 INFO L410 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-22 11:25:04,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 11:25:04,182 INFO L82 PathProgramCache]: Analyzing trace with hash -687460973, now seen corresponding path program 5 times [2019-10-22 11:25:04,184 INFO L157 tionRefinementEngine]: Executing refinement strategy WALRUS [2019-10-22 11:25:04,184 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1132767693] [2019-10-22 11:25:04,184 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/cvc4 Starting monitored process 11 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-10-22 11:25:04,257 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-10-22 11:25:04,257 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-22 11:25:04,258 INFO L256 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-22 11:25:04,260 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 11:25:04,327 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2019-10-22 11:25:04,328 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-22 11:25:04,568 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:04,692 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:04,772 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:04,833 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:04,868 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:04,895 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-10-22 11:25:04,896 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1132767693] [2019-10-22 11:25:04,896 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1594851913] [2019-10-22 11:25:04,896 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-22 11:25:04,969 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-10-22 11:25:04,969 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-22 11:25:04,971 INFO L256 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-22 11:25:04,973 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 11:25:04,982 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2019-10-22 11:25:04,983 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-22 11:25:05,271 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:05,355 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:05,423 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:05,481 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:05,499 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:05,504 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-10-22 11:25:05,504 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-22 11:25:05,504 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15, 10, 15] total 17 [2019-10-22 11:25:05,504 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [789365494] [2019-10-22 11:25:05,505 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-22 11:25:05,505 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2019-10-22 11:25:05,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-22 11:25:05,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2019-10-22 11:25:05,506 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand 17 states. [2019-10-22 11:25:05,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-22 11:25:05,664 INFO L93 Difference]: Finished difference Result 33 states and 34 transitions. [2019-10-22 11:25:05,664 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-22 11:25:05,665 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2019-10-22 11:25:05,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-22 11:25:05,666 INFO L225 Difference]: With dead ends: 33 [2019-10-22 11:25:05,666 INFO L226 Difference]: Without dead ends: 29 [2019-10-22 11:25:05,666 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 136 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=104, Invalid=402, Unknown=0, NotChecked=0, Total=506 [2019-10-22 11:25:05,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-10-22 11:25:05,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2019-10-22 11:25:05,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2019-10-22 11:25:05,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2019-10-22 11:25:05,671 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 39 [2019-10-22 11:25:05,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-22 11:25:05,672 INFO L462 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2019-10-22 11:25:05,672 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-22 11:25:05,672 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2019-10-22 11:25:05,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-10-22 11:25:05,673 INFO L372 BasicCegarLoop]: Found error trace [2019-10-22 11:25:05,673 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 11:25:06,073 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,11 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-10-22 11:25:06,074 INFO L410 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-22 11:25:06,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 11:25:06,074 INFO L82 PathProgramCache]: Analyzing trace with hash 547744169, now seen corresponding path program 6 times [2019-10-22 11:25:06,074 INFO L157 tionRefinementEngine]: Executing refinement strategy WALRUS [2019-10-22 11:25:06,074 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [1000909764] [2019-10-22 11:25:06,074 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/cvc4 Starting monitored process 13 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-10-22 11:25:06,161 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-10-22 11:25:06,161 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-22 11:25:06,162 INFO L256 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-22 11:25:06,163 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 11:25:06,328 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2019-10-22 11:25:06,328 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-22 11:25:06,947 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2019-10-22 11:25:06,947 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1000909764] [2019-10-22 11:25:06,947 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [908119302] [2019-10-22 11:25:06,947 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-22 11:25:06,996 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-10-22 11:25:06,996 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-22 11:25:06,998 INFO L256 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-22 11:25:06,999 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 11:25:07,019 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2019-10-22 11:25:07,020 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-22 11:25:07,357 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2019-10-22 11:25:07,357 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-22 11:25:07,357 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17] total 32 [2019-10-22 11:25:07,357 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636180087] [2019-10-22 11:25:07,358 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-10-22 11:25:07,358 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2019-10-22 11:25:07,359 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-10-22 11:25:07,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=844, Unknown=0, NotChecked=0, Total=992 [2019-10-22 11:25:07,359 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 32 states. [2019-10-22 11:25:07,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-22 11:25:07,765 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2019-10-22 11:25:07,765 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-10-22 11:25:07,765 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 45 [2019-10-22 11:25:07,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-22 11:25:07,767 INFO L225 Difference]: With dead ends: 56 [2019-10-22 11:25:07,768 INFO L226 Difference]: Without dead ends: 50 [2019-10-22 11:25:07,769 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 144 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=293, Invalid=1429, Unknown=0, NotChecked=0, Total=1722 [2019-10-22 11:25:07,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-10-22 11:25:07,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2019-10-22 11:25:07,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2019-10-22 11:25:07,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2019-10-22 11:25:07,777 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 45 [2019-10-22 11:25:07,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-22 11:25:07,777 INFO L462 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2019-10-22 11:25:07,777 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-10-22 11:25:07,777 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2019-10-22 11:25:07,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2019-10-22 11:25:07,779 INFO L372 BasicCegarLoop]: Found error trace [2019-10-22 11:25:07,779 INFO L380 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 11:25:08,180 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,13 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-10-22 11:25:08,180 INFO L410 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-22 11:25:08,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 11:25:08,181 INFO L82 PathProgramCache]: Analyzing trace with hash -1887065709, now seen corresponding path program 7 times [2019-10-22 11:25:08,181 INFO L157 tionRefinementEngine]: Executing refinement strategy WALRUS [2019-10-22 11:25:08,181 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [61629629] [2019-10-22 11:25:08,181 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/cvc4 Starting monitored process 15 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-10-22 11:25:08,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 11:25:08,276 INFO L256 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 30 conjunts are in the unsatisfiable core [2019-10-22 11:25:08,278 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 11:25:08,416 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2019-10-22 11:25:08,417 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-22 11:25:09,080 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:09,326 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:09,582 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:09,804 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:10,018 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:10,212 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:10,372 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:10,509 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:10,634 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:10,743 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:10,826 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:10,892 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:10,931 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:10,968 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2019-10-22 11:25:10,968 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [61629629] [2019-10-22 11:25:10,968 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [110402129] [2019-10-22 11:25:10,968 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-22 11:25:11,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-22 11:25:11,061 INFO L256 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 30 conjunts are in the unsatisfiable core [2019-10-22 11:25:11,062 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 11:25:11,101 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2019-10-22 11:25:11,102 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-22 11:25:11,630 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:11,852 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:12,074 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:12,269 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:12,454 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:12,604 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:12,739 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:12,888 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:13,063 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:13,155 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:13,210 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:13,256 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:13,272 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:13,292 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 429 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2019-10-22 11:25:13,292 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-22 11:25:13,292 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 31, 18, 31] total 33 [2019-10-22 11:25:13,292 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720399448] [2019-10-22 11:25:13,293 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-10-22 11:25:13,293 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2019-10-22 11:25:13,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-10-22 11:25:13,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2019-10-22 11:25:13,294 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand 33 states. [2019-10-22 11:25:13,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-22 11:25:13,651 INFO L93 Difference]: Finished difference Result 57 states and 58 transitions. [2019-10-22 11:25:13,652 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-22 11:25:13,652 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 87 [2019-10-22 11:25:13,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-22 11:25:13,653 INFO L225 Difference]: With dead ends: 57 [2019-10-22 11:25:13,653 INFO L226 Difference]: Without dead ends: 53 [2019-10-22 11:25:13,654 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 358 GetRequests, 301 SyntacticMatches, 12 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 250 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=344, Invalid=1818, Unknown=0, NotChecked=0, Total=2162 [2019-10-22 11:25:13,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2019-10-22 11:25:13,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2019-10-22 11:25:13,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-10-22 11:25:13,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 54 transitions. [2019-10-22 11:25:13,660 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 54 transitions. Word has length 87 [2019-10-22 11:25:13,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-22 11:25:13,660 INFO L462 AbstractCegarLoop]: Abstraction has 53 states and 54 transitions. [2019-10-22 11:25:13,660 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-10-22 11:25:13,660 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 54 transitions. [2019-10-22 11:25:13,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2019-10-22 11:25:13,662 INFO L372 BasicCegarLoop]: Found error trace [2019-10-22 11:25:13,662 INFO L380 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 11:25:14,062 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,15 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-10-22 11:25:14,063 INFO L410 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-22 11:25:14,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 11:25:14,063 INFO L82 PathProgramCache]: Analyzing trace with hash -1777212503, now seen corresponding path program 8 times [2019-10-22 11:25:14,063 INFO L157 tionRefinementEngine]: Executing refinement strategy WALRUS [2019-10-22 11:25:14,063 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [396370394] [2019-10-22 11:25:14,063 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/cvc4 Starting monitored process 17 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-10-22 11:25:14,209 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-22 11:25:14,209 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-22 11:25:14,211 INFO L256 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 32 conjunts are in the unsatisfiable core [2019-10-22 11:25:14,212 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 11:25:14,409 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2019-10-22 11:25:14,409 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-22 11:25:15,133 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:15,394 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:15,623 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:15,844 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:16,047 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:16,293 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:16,502 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:16,644 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:16,770 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:16,879 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:16,973 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:17,045 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:17,101 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:17,141 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:17,201 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 497 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2019-10-22 11:25:17,201 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [396370394] [2019-10-22 11:25:17,201 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [309558131] [2019-10-22 11:25:17,201 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-22 11:25:17,323 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-22 11:25:17,323 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-22 11:25:17,326 INFO L256 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 32 conjunts are in the unsatisfiable core [2019-10-22 11:25:17,327 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-22 11:25:17,361 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2019-10-22 11:25:17,361 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-22 11:25:18,115 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:18,382 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:18,623 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:18,835 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:19,030 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:19,198 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:19,353 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:19,474 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:19,582 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:19,666 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:19,735 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:19,787 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:19,840 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:19,863 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-22 11:25:19,879 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 497 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2019-10-22 11:25:19,880 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-22 11:25:19,880 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 33, 19, 33] total 35 [2019-10-22 11:25:19,880 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [849906020] [2019-10-22 11:25:19,881 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-10-22 11:25:19,881 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2019-10-22 11:25:19,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-10-22 11:25:19,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2019-10-22 11:25:19,881 INFO L87 Difference]: Start difference. First operand 53 states and 54 transitions. Second operand 35 states. [2019-10-22 11:25:20,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-22 11:25:20,252 INFO L93 Difference]: Finished difference Result 60 states and 61 transitions. [2019-10-22 11:25:20,252 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-22 11:25:20,252 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 93 [2019-10-22 11:25:20,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-22 11:25:20,253 INFO L225 Difference]: With dead ends: 60 [2019-10-22 11:25:20,253 INFO L226 Difference]: Without dead ends: 56 [2019-10-22 11:25:20,254 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 383 GetRequests, 318 SyntacticMatches, 17 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 302 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=383, Invalid=2067, Unknown=0, NotChecked=0, Total=2450 [2019-10-22 11:25:20,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-10-22 11:25:20,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2019-10-22 11:25:20,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-10-22 11:25:20,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2019-10-22 11:25:20,260 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 93 [2019-10-22 11:25:20,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-22 11:25:20,260 INFO L462 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2019-10-22 11:25:20,260 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-10-22 11:25:20,260 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2019-10-22 11:25:20,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2019-10-22 11:25:20,261 INFO L372 BasicCegarLoop]: Found error trace [2019-10-22 11:25:20,261 INFO L380 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1] [2019-10-22 11:25:20,662 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,17 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-10-22 11:25:20,662 INFO L410 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-22 11:25:20,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-22 11:25:20,663 INFO L82 PathProgramCache]: Analyzing trace with hash -948911981, now seen corresponding path program 9 times [2019-10-22 11:25:20,663 INFO L157 tionRefinementEngine]: Executing refinement strategy WALRUS [2019-10-22 11:25:20,663 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleCvc4 [414508536] [2019-10-22 11:25:20,663 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/cvc4 Starting monitored process 19 with cvc4 --incremental --print-success --lang smt --rewrite-divk (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-10-22 11:25:20,989 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-10-22 11:25:20,989 INFO L250 tOrderPrioritization]: Conjunction of SSA is sat [2019-10-22 11:25:21,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-22 11:25:21,128 INFO L168 tionRefinementEngine]: Strategy WALRUS found a feasible trace [2019-10-22 11:25:21,128 INFO L445 BasicCegarLoop]: Counterexample might be feasible [2019-10-22 11:25:21,328 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 cvc4 --incremental --print-success --lang smt --rewrite-divk [2019-10-22 11:25:21,352 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.10 11:25:21 BoogieIcfgContainer [2019-10-22 11:25:21,352 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-10-22 11:25:21,352 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2019-10-22 11:25:21,352 INFO L271 PluginConnector]: Initializing Witness Printer... [2019-10-22 11:25:21,352 INFO L275 PluginConnector]: Witness Printer initialized [2019-10-22 11:25:21,353 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.10 11:24:58" (3/4) ... [2019-10-22 11:25:21,355 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2019-10-22 11:25:21,415 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_7a14d4d0-2286-4632-b9d4-e9ca49da3563/bin/utaipan/witness.graphml [2019-10-22 11:25:21,415 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2019-10-22 11:25:21,417 INFO L168 Benchmark]: Toolchain (without parser) took 23324.51 ms. Allocated memory was 1.0 GB in the beginning and 1.4 GB in the end (delta: 399.5 MB). Free memory was 951.0 MB in the beginning and 1.0 GB in the end (delta: -66.7 MB). Peak memory consumption was 332.8 MB. Max. memory is 11.5 GB. [2019-10-22 11:25:21,417 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 1.0 GB. Free memory is still 977.9 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-10-22 11:25:21,418 INFO L168 Benchmark]: CACSL2BoogieTranslator took 196.98 ms. Allocated memory is still 1.0 GB. Free memory was 951.0 MB in the beginning and 940.2 MB in the end (delta: 10.7 MB). Peak memory consumption was 10.7 MB. Max. memory is 11.5 GB. [2019-10-22 11:25:21,418 INFO L168 Benchmark]: Boogie Procedure Inliner took 35.84 ms. Allocated memory is still 1.0 GB. Free memory is still 940.2 MB. There was no memory consumed. Max. memory is 11.5 GB. [2019-10-22 11:25:21,418 INFO L168 Benchmark]: Boogie Preprocessor took 77.91 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 158.9 MB). Free memory was 940.2 MB in the beginning and 1.2 GB in the end (delta: -214.4 MB). Peak memory consumption was 12.5 MB. Max. memory is 11.5 GB. [2019-10-22 11:25:21,425 INFO L168 Benchmark]: RCFGBuilder took 191.88 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: 18.4 MB). Peak memory consumption was 18.4 MB. Max. memory is 11.5 GB. [2019-10-22 11:25:21,425 INFO L168 Benchmark]: TraceAbstraction took 22754.66 ms. Allocated memory was 1.2 GB in the beginning and 1.4 GB in the end (delta: 240.6 MB). Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 107.7 MB). Peak memory consumption was 348.4 MB. Max. memory is 11.5 GB. [2019-10-22 11:25:21,425 INFO L168 Benchmark]: Witness Printer took 63.11 ms. Allocated memory is still 1.4 GB. Free memory was 1.0 GB in the beginning and 1.0 GB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 11.5 GB. [2019-10-22 11:25:21,427 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 1.0 GB. Free memory is still 977.9 MB. There was no memory consumed. Max. memory is 11.5 GB. * CACSL2BoogieTranslator took 196.98 ms. Allocated memory is still 1.0 GB. Free memory was 951.0 MB in the beginning and 940.2 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 35.84 ms. Allocated memory is still 1.0 GB. Free memory is still 940.2 MB. There was no memory consumed. Max. memory is 11.5 GB. * Boogie Preprocessor took 77.91 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 158.9 MB). Free memory was 940.2 MB in the beginning and 1.2 GB in the end (delta: -214.4 MB). Peak memory consumption was 12.5 MB. Max. memory is 11.5 GB. * RCFGBuilder took 191.88 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: 18.4 MB). Peak memory consumption was 18.4 MB. Max. memory is 11.5 GB. * TraceAbstraction took 22754.66 ms. Allocated memory was 1.2 GB in the beginning and 1.4 GB in the end (delta: 240.6 MB). Free memory was 1.1 GB in the beginning and 1.0 GB in the end (delta: 107.7 MB). Peak memory consumption was 348.4 MB. Max. memory is 11.5 GB. * Witness Printer took 63.11 ms. Allocated memory is still 1.4 GB. Free memory was 1.0 GB in the beginning and 1.0 GB in the end (delta: 10.8 MB). Peak memory consumption was 10.8 MB. Max. memory is 11.5 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] int input = 15; [L11] CALL, EXPR id(input) VAL [\old(x)=15] [L5] COND FALSE !(x==0) VAL [\old(x)=15, x=15] [L6] CALL, EXPR id(x-1) VAL [\old(x)=14] [L5] COND FALSE !(x==0) VAL [\old(x)=14, x=14] [L6] CALL, EXPR id(x-1) VAL [\old(x)=13] [L5] COND FALSE !(x==0) VAL [\old(x)=13, x=13] [L6] CALL, EXPR id(x-1) VAL [\old(x)=12] [L5] COND FALSE !(x==0) VAL [\old(x)=12, x=12] [L6] CALL, EXPR id(x-1) VAL [\old(x)=11] [L5] COND FALSE !(x==0) VAL [\old(x)=11, x=11] [L6] CALL, EXPR id(x-1) VAL [\old(x)=10] [L5] COND FALSE !(x==0) VAL [\old(x)=10, x=10] [L6] CALL, EXPR id(x-1) VAL [\old(x)=9] [L5] COND FALSE !(x==0) VAL [\old(x)=9, x=9] [L6] CALL, EXPR id(x-1) VAL [\old(x)=8] [L5] COND FALSE !(x==0) VAL [\old(x)=8, x=8] [L6] CALL, EXPR id(x-1) VAL [\old(x)=7] [L5] COND FALSE !(x==0) VAL [\old(x)=7, x=7] [L6] CALL, EXPR id(x-1) VAL [\old(x)=6] [L5] COND FALSE !(x==0) VAL [\old(x)=6, x=6] [L6] CALL, EXPR id(x-1) VAL [\old(x)=5] [L5] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L6] CALL, EXPR id(x-1) VAL [\old(x)=4] [L5] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L6] CALL, EXPR id(x-1) VAL [\old(x)=3] [L5] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L6] CALL, EXPR id(x-1) VAL [\old(x)=2] [L5] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L6] CALL, EXPR id(x-1) VAL [\old(x)=1] [L5] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L6] CALL, EXPR id(x-1) VAL [\old(x)=0] [L5] COND TRUE x==0 [L5] return 0; VAL [\old(x)=0, \result=0, x=0] [L6] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=3, id(x-1)=2, x=3] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=5, id(x-1)=4, x=5] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=6, id(x-1)=5, x=6] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=7, id(x-1)=6, x=7] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=8, id(x-1)=7, x=8] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=9, id(x-1)=8, x=9] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=10, id(x-1)=9, x=10] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=11, id(x-1)=10, x=11] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=12, id(x-1)=11, x=12] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=13, id(x-1)=12, x=13] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=14, id(x-1)=13, x=14] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=15, id(x-1)=14, x=15] [L6] return id(x-1) + 1; [L11] RET, EXPR id(input) [L11] int result = id(input); [L12] COND TRUE result == 15 [L13] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 15 locations, 1 error locations. Result: UNSAFE, OverallTime: 22.7s, OverallIterations: 10, TraceHistogramMax: 16, AutomataDifference: 1.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 175 SDtfs, 409 SDslu, 1768 SDs, 0 SdLazy, 1247 SolverSat, 139 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1484 GetRequests, 1238 SyntacticMatches, 32 SemanticMatches, 214 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 787 ImplicationChecksByTransitivity, 3.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=56occurred in iteration=9, 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, 9 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 15.4s InterpolantComputationTime, 828 NumberOfCodeBlocks, 828 NumberOfCodeBlocksAsserted, 65 NumberOfCheckSat, 1424 ConstructedInterpolants, 0 QuantifiedInterpolants, 340048 SizeOfPredicates, 116 NumberOfNonLiveVariables, 1006 ConjunctsInSsa, 260 ConjunctsInUnsatCore, 34 InterpolantComputations, 2 PerfectInterpolantSequences, 1992/5664 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...