./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 7b2dab56 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_1828de90-1d2a-4fbb-8c77-1f35c4aa21f5/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_1828de90-1d2a-4fbb-8c77-1f35c4aa21f5/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_1828de90-1d2a-4fbb-8c77-1f35c4aa21f5/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_1828de90-1d2a-4fbb-8c77-1f35c4aa21f5/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/id_i15_o15-2.c -s /tmp/vcloud-vcloud-master/worker/run_dir_1828de90-1d2a-4fbb-8c77-1f35c4aa21f5/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_1828de90-1d2a-4fbb-8c77-1f35c4aa21f5/bin/utaipan --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 81c3a4bcb7df13b97375e2abc10c6fdc1a8edbd3 ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.0-7b2dab5 [2020-12-09 17:31:08,991 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-09 17:31:08,992 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-09 17:31:09,043 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-09 17:31:09,043 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-09 17:31:09,044 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-09 17:31:09,046 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-09 17:31:09,048 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-09 17:31:09,049 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-09 17:31:09,050 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-09 17:31:09,051 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-09 17:31:09,052 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-09 17:31:09,052 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-09 17:31:09,053 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-09 17:31:09,054 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-09 17:31:09,055 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-09 17:31:09,055 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-09 17:31:09,056 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-09 17:31:09,058 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-09 17:31:09,059 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-09 17:31:09,060 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-09 17:31:09,062 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-09 17:31:09,063 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-09 17:31:09,064 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-09 17:31:09,067 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-09 17:31:09,067 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-09 17:31:09,068 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-09 17:31:09,069 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-09 17:31:09,069 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-09 17:31:09,070 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-09 17:31:09,071 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-09 17:31:09,072 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-09 17:31:09,072 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-09 17:31:09,073 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-09 17:31:09,074 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-09 17:31:09,075 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-09 17:31:09,075 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-09 17:31:09,075 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-09 17:31:09,076 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-09 17:31:09,076 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-09 17:31:09,077 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-09 17:31:09,078 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_1828de90-1d2a-4fbb-8c77-1f35c4aa21f5/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-12-09 17:31:09,100 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-09 17:31:09,100 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-09 17:31:09,101 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-09 17:31:09,101 INFO L138 SettingsManager]: * User list type=DISABLED [2020-12-09 17:31:09,101 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-12-09 17:31:09,101 INFO L138 SettingsManager]: * Explicit value domain=true [2020-12-09 17:31:09,102 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-12-09 17:31:09,102 INFO L138 SettingsManager]: * Octagon Domain=false [2020-12-09 17:31:09,102 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-12-09 17:31:09,102 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-12-09 17:31:09,102 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-12-09 17:31:09,102 INFO L138 SettingsManager]: * Interval Domain=false [2020-12-09 17:31:09,103 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-12-09 17:31:09,103 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-12-09 17:31:09,103 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-12-09 17:31:09,104 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-09 17:31:09,104 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-09 17:31:09,104 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-09 17:31:09,104 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-09 17:31:09,104 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-09 17:31:09,104 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-09 17:31:09,105 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-09 17:31:09,105 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-09 17:31:09,105 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-12-09 17:31:09,105 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-09 17:31:09,105 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-09 17:31:09,105 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-09 17:31:09,106 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-09 17:31:09,106 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-09 17:31:09,106 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-09 17:31:09,106 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-09 17:31:09,106 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-09 17:31:09,107 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-09 17:31:09,107 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-09 17:31:09,107 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-12-09 17:31:09,107 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-09 17:31:09,107 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-09 17:31:09,107 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-09 17:31:09,108 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-09 17:31:09,108 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud-vcloud-master/worker/run_dir_1828de90-1d2a-4fbb-8c77-1f35c4aa21f5/bin/utaipan/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_1828de90-1d2a-4fbb-8c77-1f35c4aa21f5/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 81c3a4bcb7df13b97375e2abc10c6fdc1a8edbd3 [2020-12-09 17:31:09,286 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-09 17:31:09,306 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-09 17:31:09,308 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-09 17:31:09,309 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-09 17:31:09,309 INFO L275 PluginConnector]: CDTParser initialized [2020-12-09 17:31:09,310 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_1828de90-1d2a-4fbb-8c77-1f35c4aa21f5/bin/utaipan/../../sv-benchmarks/c/recursive-simple/id_i15_o15-2.c [2020-12-09 17:31:09,353 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_1828de90-1d2a-4fbb-8c77-1f35c4aa21f5/bin/utaipan/data/269afd6cc/8ea288d048d44452961eb74b30fa1909/FLAG910d717a5 [2020-12-09 17:31:09,710 INFO L306 CDTParser]: Found 1 translation units. [2020-12-09 17:31:09,710 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_1828de90-1d2a-4fbb-8c77-1f35c4aa21f5/sv-benchmarks/c/recursive-simple/id_i15_o15-2.c [2020-12-09 17:31:09,715 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_1828de90-1d2a-4fbb-8c77-1f35c4aa21f5/bin/utaipan/data/269afd6cc/8ea288d048d44452961eb74b30fa1909/FLAG910d717a5 [2020-12-09 17:31:09,724 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_1828de90-1d2a-4fbb-8c77-1f35c4aa21f5/bin/utaipan/data/269afd6cc/8ea288d048d44452961eb74b30fa1909 [2020-12-09 17:31:09,726 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-09 17:31:09,727 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-09 17:31:09,728 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-09 17:31:09,728 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-09 17:31:09,730 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-09 17:31:09,731 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 05:31:09" (1/1) ... [2020-12-09 17:31:09,732 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2ddf25d4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:31:09, skipping insertion in model container [2020-12-09 17:31:09,733 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 05:31:09" (1/1) ... [2020-12-09 17:31:09,738 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-09 17:31:09,747 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-09 17:31:09,855 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_1828de90-1d2a-4fbb-8c77-1f35c4aa21f5/sv-benchmarks/c/recursive-simple/id_i15_o15-2.c[454,467] [2020-12-09 17:31:09,858 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 17:31:09,866 INFO L203 MainTranslator]: Completed pre-run [2020-12-09 17:31:09,875 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_1828de90-1d2a-4fbb-8c77-1f35c4aa21f5/sv-benchmarks/c/recursive-simple/id_i15_o15-2.c[454,467] [2020-12-09 17:31:09,876 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 17:31:09,885 INFO L208 MainTranslator]: Completed translation [2020-12-09 17:31:09,885 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:31:09 WrapperNode [2020-12-09 17:31:09,886 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-09 17:31:09,886 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-09 17:31:09,886 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-09 17:31:09,887 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-09 17:31:09,892 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:31:09" (1/1) ... [2020-12-09 17:31:09,896 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:31:09" (1/1) ... [2020-12-09 17:31:09,907 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-09 17:31:09,907 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-09 17:31:09,908 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-09 17:31:09,908 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-09 17:31:09,913 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:31:09" (1/1) ... [2020-12-09 17:31:09,913 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:31:09" (1/1) ... [2020-12-09 17:31:09,914 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:31:09" (1/1) ... [2020-12-09 17:31:09,914 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:31:09" (1/1) ... [2020-12-09 17:31:09,916 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:31:09" (1/1) ... [2020-12-09 17:31:09,918 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:31:09" (1/1) ... [2020-12-09 17:31:09,918 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:31:09" (1/1) ... [2020-12-09 17:31:09,919 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-09 17:31:09,920 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-09 17:31:09,920 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-09 17:31:09,920 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-09 17:31:09,921 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:31:09" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_1828de90-1d2a-4fbb-8c77-1f35c4aa21f5/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 [2020-12-09 17:31:09,982 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-09 17:31:09,982 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-09 17:31:09,983 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-09 17:31:09,983 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-12-09 17:31:09,983 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-12-09 17:31:09,983 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-09 17:31:10,126 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-09 17:31:10,126 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2020-12-09 17:31:10,127 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 05:31:10 BoogieIcfgContainer [2020-12-09 17:31:10,128 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-09 17:31:10,129 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-09 17:31:10,129 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-09 17:31:10,131 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-09 17:31:10,131 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 05:31:09" (1/3) ... [2020-12-09 17:31:10,132 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d0364cd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 05:31:10, skipping insertion in model container [2020-12-09 17:31:10,132 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:31:09" (2/3) ... [2020-12-09 17:31:10,132 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d0364cd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 05:31:10, skipping insertion in model container [2020-12-09 17:31:10,132 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 05:31:10" (3/3) ... [2020-12-09 17:31:10,133 INFO L111 eAbstractionObserver]: Analyzing ICFG id_i15_o15-2.c [2020-12-09 17:31:10,143 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-09 17:31:10,145 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-09 17:31:10,153 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-09 17:31:10,169 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-09 17:31:10,170 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-09 17:31:10,170 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-09 17:31:10,170 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-09 17:31:10,170 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-09 17:31:10,170 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-09 17:31:10,170 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-09 17:31:10,170 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-09 17:31:10,180 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states. [2020-12-09 17:31:10,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-09 17:31:10,183 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 17:31:10,184 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 17:31:10,184 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 17:31:10,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 17:31:10,188 INFO L82 PathProgramCache]: Analyzing trace with hash 1493244868, now seen corresponding path program 1 times [2020-12-09 17:31:10,194 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 17:31:10,194 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1908273196] [2020-12-09 17:31:10,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 17:31:10,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 17:31:10,323 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 17:31:10,324 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1908273196] [2020-12-09 17:31:10,325 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 17:31:10,325 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-09 17:31:10,325 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [293839455] [2020-12-09 17:31:10,329 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-09 17:31:10,330 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 17:31:10,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-09 17:31:10,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-09 17:31:10,345 INFO L87 Difference]: Start difference. First operand 14 states. Second operand 5 states. [2020-12-09 17:31:10,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 17:31:10,395 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2020-12-09 17:31:10,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-09 17:31:10,397 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 9 [2020-12-09 17:31:10,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 17:31:10,405 INFO L225 Difference]: With dead ends: 22 [2020-12-09 17:31:10,405 INFO L226 Difference]: Without dead ends: 14 [2020-12-09 17:31:10,408 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-12-09 17:31:10,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-12-09 17:31:10,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-12-09 17:31:10,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-12-09 17:31:10,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2020-12-09 17:31:10,440 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 9 [2020-12-09 17:31:10,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 17:31:10,441 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2020-12-09 17:31:10,441 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-09 17:31:10,441 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2020-12-09 17:31:10,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-12-09 17:31:10,442 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 17:31:10,442 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 17:31:10,443 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-09 17:31:10,443 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 17:31:10,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 17:31:10,444 INFO L82 PathProgramCache]: Analyzing trace with hash -642736818, now seen corresponding path program 1 times [2020-12-09 17:31:10,444 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 17:31:10,444 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [911001429] [2020-12-09 17:31:10,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 17:31:10,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 17:31:10,533 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-09 17:31:10,534 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [911001429] [2020-12-09 17:31:10,534 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1094698675] [2020-12-09 17:31:10,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_1828de90-1d2a-4fbb-8c77-1f35c4aa21f5/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 [2020-12-09 17:31:10,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 17:31:10,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-09 17:31:10,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 17:31:10,642 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-09 17:31:10,642 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 17:31:10,777 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-09 17:31:10,778 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1621162258] [2020-12-09 17:31:10,800 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2020-12-09 17:31:10,800 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 17:31:10,805 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-12-09 17:31:10,806 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 17:31:10,806 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 7] total 12 [2020-12-09 17:31:10,807 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1775147080] [2020-12-09 17:31:10,807 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-09 17:31:10,808 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 17:31:10,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-09 17:31:10,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2020-12-09 17:31:10,809 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 12 states. [2020-12-09 17:31:10,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 17:31:10,896 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2020-12-09 17:31:10,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-09 17:31:10,897 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 15 [2020-12-09 17:31:10,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 17:31:10,897 INFO L225 Difference]: With dead ends: 24 [2020-12-09 17:31:10,897 INFO L226 Difference]: Without dead ends: 20 [2020-12-09 17:31:10,898 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=70, Invalid=170, Unknown=0, NotChecked=0, Total=240 [2020-12-09 17:31:10,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-12-09 17:31:10,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-12-09 17:31:10,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-09 17:31:10,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-12-09 17:31:10,902 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 15 [2020-12-09 17:31:10,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 17:31:10,903 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-12-09 17:31:10,903 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-09 17:31:10,903 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-12-09 17:31:10,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-12-09 17:31:10,903 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 17:31:10,904 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 17:31:11,104 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-09 17:31:11,106 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 17:31:11,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 17:31:11,107 INFO L82 PathProgramCache]: Analyzing trace with hash 54189198, now seen corresponding path program 2 times [2020-12-09 17:31:11,108 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 17:31:11,109 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [460067447] [2020-12-09 17:31:11,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 17:31:11,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 17:31:11,296 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-09 17:31:11,296 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [460067447] [2020-12-09 17:31:11,296 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1890596058] [2020-12-09 17:31:11,296 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_1828de90-1d2a-4fbb-8c77-1f35c4aa21f5/bin/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 17:31:11,327 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-12-09 17:31:11,327 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 17:31:11,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-09 17:31:11,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 17:31:11,385 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-12-09 17:31:11,385 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 17:31:11,749 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-12-09 17:31:11,750 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [332458228] [2020-12-09 17:31:11,752 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2020-12-09 17:31:11,752 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 17:31:11,752 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-12-09 17:31:11,752 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 17:31:11,752 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 11] total 16 [2020-12-09 17:31:11,753 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954675527] [2020-12-09 17:31:11,753 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-09 17:31:11,753 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 17:31:11,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-09 17:31:11,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240 [2020-12-09 17:31:11,754 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 16 states. [2020-12-09 17:31:11,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 17:31:11,857 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-12-09 17:31:11,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-09 17:31:11,858 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 27 [2020-12-09 17:31:11,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 17:31:11,859 INFO L225 Difference]: With dead ends: 30 [2020-12-09 17:31:11,859 INFO L226 Difference]: Without dead ends: 26 [2020-12-09 17:31:11,859 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=324, Unknown=0, NotChecked=0, Total=462 [2020-12-09 17:31:11,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-12-09 17:31:11,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-12-09 17:31:11,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-12-09 17:31:11,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2020-12-09 17:31:11,864 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 27 [2020-12-09 17:31:11,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 17:31:11,864 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2020-12-09 17:31:11,864 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-09 17:31:11,864 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2020-12-09 17:31:11,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-12-09 17:31:11,865 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 17:31:11,865 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 17:31:12,065 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 17:31:12,067 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 17:31:12,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 17:31:12,068 INFO L82 PathProgramCache]: Analyzing trace with hash -4035634, now seen corresponding path program 3 times [2020-12-09 17:31:12,068 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 17:31:12,069 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [57152392] [2020-12-09 17:31:12,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 17:31:12,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 17:31:12,191 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2020-12-09 17:31:12,191 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [57152392] [2020-12-09 17:31:12,192 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [96325085] [2020-12-09 17:31:12,192 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_1828de90-1d2a-4fbb-8c77-1f35c4aa21f5/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 [2020-12-09 17:31:12,224 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 17:31:12,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 17:31:12,225 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 14 conjunts are in the unsatisfiable core [2020-12-09 17:31:12,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 17:31:12,297 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-12-09 17:31:12,297 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 17:31:13,056 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-12-09 17:31:13,056 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [117741805] [2020-12-09 17:31:13,058 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2020-12-09 17:31:13,058 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 17:31:13,058 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-12-09 17:31:13,059 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 17:31:13,059 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 15] total 20 [2020-12-09 17:31:13,059 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268552865] [2020-12-09 17:31:13,059 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-09 17:31:13,059 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 17:31:13,060 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-09 17:31:13,060 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=286, Unknown=0, NotChecked=0, Total=380 [2020-12-09 17:31:13,060 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand 20 states. [2020-12-09 17:31:13,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 17:31:13,202 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-12-09 17:31:13,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-09 17:31:13,203 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 39 [2020-12-09 17:31:13,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 17:31:13,204 INFO L225 Difference]: With dead ends: 36 [2020-12-09 17:31:13,204 INFO L226 Difference]: Without dead ends: 32 [2020-12-09 17:31:13,205 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=230, Invalid=526, Unknown=0, NotChecked=0, Total=756 [2020-12-09 17:31:13,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-12-09 17:31:13,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-12-09 17:31:13,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-12-09 17:31:13,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2020-12-09 17:31:13,209 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 39 [2020-12-09 17:31:13,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 17:31:13,209 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2020-12-09 17:31:13,209 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-09 17:31:13,209 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2020-12-09 17:31:13,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-12-09 17:31:13,210 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 17:31:13,211 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 17:31:13,411 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 17:31:13,413 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 17:31:13,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 17:31:13,414 INFO L82 PathProgramCache]: Analyzing trace with hash 1466649358, now seen corresponding path program 4 times [2020-12-09 17:31:13,414 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 17:31:13,415 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [503398608] [2020-12-09 17:31:13,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 17:31:13,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 17:31:13,558 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2020-12-09 17:31:13,558 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [503398608] [2020-12-09 17:31:13,558 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [51205151] [2020-12-09 17:31:13,559 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_1828de90-1d2a-4fbb-8c77-1f35c4aa21f5/bin/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 17:31:13,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 17:31:13,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 18 conjunts are in the unsatisfiable core [2020-12-09 17:31:13,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 17:31:13,670 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-12-09 17:31:13,670 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 17:31:15,198 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-12-09 17:31:15,198 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [167425643] [2020-12-09 17:31:15,200 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2020-12-09 17:31:15,200 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 17:31:15,201 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-12-09 17:31:15,201 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 17:31:15,201 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 19] total 24 [2020-12-09 17:31:15,201 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1594899908] [2020-12-09 17:31:15,202 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-12-09 17:31:15,202 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 17:31:15,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-12-09 17:31:15,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=416, Unknown=0, NotChecked=0, Total=552 [2020-12-09 17:31:15,203 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand 24 states. [2020-12-09 17:31:15,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 17:31:15,401 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-12-09 17:31:15,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-09 17:31:15,402 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 51 [2020-12-09 17:31:15,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 17:31:15,403 INFO L225 Difference]: With dead ends: 42 [2020-12-09 17:31:15,403 INFO L226 Difference]: Without dead ends: 38 [2020-12-09 17:31:15,404 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=346, Invalid=776, Unknown=0, NotChecked=0, Total=1122 [2020-12-09 17:31:15,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-12-09 17:31:15,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-12-09 17:31:15,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-12-09 17:31:15,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2020-12-09 17:31:15,411 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 51 [2020-12-09 17:31:15,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 17:31:15,411 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2020-12-09 17:31:15,411 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-12-09 17:31:15,411 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2020-12-09 17:31:15,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-12-09 17:31:15,413 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 17:31:15,413 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 17:31:15,613 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 17:31:15,614 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 17:31:15,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 17:31:15,615 INFO L82 PathProgramCache]: Analyzing trace with hash -682001842, now seen corresponding path program 5 times [2020-12-09 17:31:15,615 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 17:31:15,615 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1935941713] [2020-12-09 17:31:15,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 17:31:15,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 17:31:15,776 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 143 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2020-12-09 17:31:15,776 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1935941713] [2020-12-09 17:31:15,777 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [387877302] [2020-12-09 17:31:15,777 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_1828de90-1d2a-4fbb-8c77-1f35c4aa21f5/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 [2020-12-09 17:31:15,855 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2020-12-09 17:31:15,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 17:31:15,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 22 conjunts are in the unsatisfiable core [2020-12-09 17:31:15,858 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 17:31:16,168 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-12-09 17:31:16,168 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 17:31:18,677 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-12-09 17:31:18,677 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [664928103] [2020-12-09 17:31:18,679 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2020-12-09 17:31:18,679 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 17:31:18,679 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:138) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:345) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) 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:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-12-09 17:31:18,682 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 17:31:18,682 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23, 23] total 48 [2020-12-09 17:31:18,683 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1768413518] [2020-12-09 17:31:18,683 INFO L461 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-12-09 17:31:18,684 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 17:31:18,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-12-09 17:31:18,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=336, Invalid=1920, Unknown=0, NotChecked=0, Total=2256 [2020-12-09 17:31:18,685 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand 48 states. [2020-12-09 17:31:19,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 17:31:19,572 INFO L93 Difference]: Finished difference Result 62 states and 68 transitions. [2020-12-09 17:31:19,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-12-09 17:31:19,572 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 63 [2020-12-09 17:31:19,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 17:31:19,573 INFO L225 Difference]: With dead ends: 62 [2020-12-09 17:31:19,573 INFO L226 Difference]: Without dead ends: 56 [2020-12-09 17:31:19,575 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 101 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1230 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1014, Invalid=5306, Unknown=0, NotChecked=0, Total=6320 [2020-12-09 17:31:19,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-12-09 17:31:19,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-12-09 17:31:19,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-12-09 17:31:19,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2020-12-09 17:31:19,581 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 63 [2020-12-09 17:31:19,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 17:31:19,581 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2020-12-09 17:31:19,581 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-12-09 17:31:19,581 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2020-12-09 17:31:19,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-12-09 17:31:19,583 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 17:31:19,583 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1] [2020-12-09 17:31:19,783 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-09 17:31:19,784 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 17:31:19,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 17:31:19,785 INFO L82 PathProgramCache]: Analyzing trace with hash -1758730226, now seen corresponding path program 6 times [2020-12-09 17:31:19,785 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 17:31:19,786 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [828631305] [2020-12-09 17:31:19,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 17:31:19,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-09 17:31:19,855 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-09 17:31:19,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-09 17:31:19,875 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-09 17:31:19,900 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-12-09 17:31:19,900 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-09 17:31:19,901 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-12-09 17:31:19,944 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.12 05:31:19 BoogieIcfgContainer [2020-12-09 17:31:19,944 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-09 17:31:19,944 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-09 17:31:19,944 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-09 17:31:19,944 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-09 17:31:19,945 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 05:31:10" (3/4) ... [2020-12-09 17:31:19,946 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-09 17:31:19,985 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_1828de90-1d2a-4fbb-8c77-1f35c4aa21f5/bin/utaipan/witness.graphml [2020-12-09 17:31:19,986 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-09 17:31:19,987 INFO L168 Benchmark]: Toolchain (without parser) took 10259.49 ms. Allocated memory was 107.0 MB in the beginning and 157.3 MB in the end (delta: 50.3 MB). Free memory was 70.2 MB in the beginning and 75.0 MB in the end (delta: -4.7 MB). Peak memory consumption was 46.1 MB. Max. memory is 16.1 GB. [2020-12-09 17:31:19,987 INFO L168 Benchmark]: CDTParser took 0.12 ms. Allocated memory is still 107.0 MB. Free memory was 86.2 MB in the beginning and 86.1 MB in the end (delta: 132.8 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 17:31:19,988 INFO L168 Benchmark]: CACSL2BoogieTranslator took 157.96 ms. Allocated memory is still 107.0 MB. Free memory was 70.1 MB in the beginning and 83.7 MB in the end (delta: -13.6 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-12-09 17:31:19,988 INFO L168 Benchmark]: Boogie Procedure Inliner took 20.64 ms. Allocated memory is still 107.0 MB. Free memory was 83.7 MB in the beginning and 82.1 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 17:31:19,988 INFO L168 Benchmark]: Boogie Preprocessor took 11.89 ms. Allocated memory is still 107.0 MB. Free memory was 82.1 MB in the beginning and 81.5 MB in the end (delta: 555.5 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 17:31:19,989 INFO L168 Benchmark]: RCFGBuilder took 207.84 ms. Allocated memory is still 107.0 MB. Free memory was 81.1 MB in the beginning and 69.0 MB in the end (delta: 12.0 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2020-12-09 17:31:19,989 INFO L168 Benchmark]: TraceAbstraction took 9814.99 ms. Allocated memory was 107.0 MB in the beginning and 157.3 MB in the end (delta: 50.3 MB). Free memory was 68.5 MB in the beginning and 80.2 MB in the end (delta: -11.7 MB). Peak memory consumption was 42.2 MB. Max. memory is 16.1 GB. [2020-12-09 17:31:19,989 INFO L168 Benchmark]: Witness Printer took 41.72 ms. Allocated memory is still 157.3 MB. Free memory was 80.2 MB in the beginning and 75.0 MB in the end (delta: 5.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2020-12-09 17:31:19,991 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12 ms. Allocated memory is still 107.0 MB. Free memory was 86.2 MB in the beginning and 86.1 MB in the end (delta: 132.8 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 157.96 ms. Allocated memory is still 107.0 MB. Free memory was 70.1 MB in the beginning and 83.7 MB in the end (delta: -13.6 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 20.64 ms. Allocated memory is still 107.0 MB. Free memory was 83.7 MB in the beginning and 82.1 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 11.89 ms. Allocated memory is still 107.0 MB. Free memory was 82.1 MB in the beginning and 81.5 MB in the end (delta: 555.5 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 207.84 ms. Allocated memory is still 107.0 MB. Free memory was 81.1 MB in the beginning and 69.0 MB in the end (delta: 12.0 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 9814.99 ms. Allocated memory was 107.0 MB in the beginning and 157.3 MB in the end (delta: 50.3 MB). Free memory was 68.5 MB in the beginning and 80.2 MB in the end (delta: -11.7 MB). Peak memory consumption was 42.2 MB. Max. memory is 16.1 GB. * Witness Printer took 41.72 ms. Allocated memory is still 157.3 MB. Free memory was 80.2 MB in the beginning and 75.0 MB in the end (delta: 5.2 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 15]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L12] int input = 15; [L13] CALL, EXPR id(input) VAL [\old(x)=15] [L7] COND FALSE !(x==0) VAL [\old(x)=15, x=15] [L8] CALL, EXPR id(x-1) VAL [\old(x)=14] [L7] COND FALSE !(x==0) VAL [\old(x)=14, x=14] [L8] CALL, EXPR id(x-1) VAL [\old(x)=13] [L7] COND FALSE !(x==0) VAL [\old(x)=13, x=13] [L8] CALL, EXPR id(x-1) VAL [\old(x)=12] [L7] COND FALSE !(x==0) VAL [\old(x)=12, x=12] [L8] CALL, EXPR id(x-1) VAL [\old(x)=11] [L7] COND FALSE !(x==0) VAL [\old(x)=11, x=11] [L8] CALL, EXPR id(x-1) VAL [\old(x)=10] [L7] COND FALSE !(x==0) VAL [\old(x)=10, x=10] [L8] CALL, EXPR id(x-1) VAL [\old(x)=9] [L7] COND FALSE !(x==0) VAL [\old(x)=9, x=9] [L8] CALL, EXPR id(x-1) VAL [\old(x)=8] [L7] COND FALSE !(x==0) VAL [\old(x)=8, x=8] [L8] CALL, EXPR id(x-1) VAL [\old(x)=7] [L7] COND FALSE !(x==0) VAL [\old(x)=7, x=7] [L8] CALL, EXPR id(x-1) VAL [\old(x)=6] [L7] COND FALSE !(x==0) VAL [\old(x)=6, x=6] [L8] CALL, EXPR id(x-1) VAL [\old(x)=5] [L7] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L8] CALL, EXPR id(x-1) VAL [\old(x)=4] [L7] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L8] CALL, EXPR id(x-1) VAL [\old(x)=3] [L7] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L8] CALL, EXPR id(x-1) VAL [\old(x)=2] [L7] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L8] CALL, EXPR id(x-1) VAL [\old(x)=1] [L7] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L8] CALL, EXPR id(x-1) VAL [\old(x)=0] [L7] COND TRUE x==0 [L7] return 0; VAL [\old(x)=0, \result=0, x=0] [L8] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=3, id(x-1)=2, x=3] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=5, id(x-1)=4, x=5] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=6, id(x-1)=5, x=6] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=7, id(x-1)=6, x=7] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=8, id(x-1)=7, x=8] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=9, id(x-1)=8, x=9] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=10, id(x-1)=9, x=10] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=11, id(x-1)=10, x=11] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=12, id(x-1)=11, x=12] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=13, id(x-1)=12, x=13] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=14, id(x-1)=13, x=14] [L8] return id(x-1) + 1; [L8] RET, EXPR id(x-1) VAL [\old(x)=15, id(x-1)=14, x=15] [L8] return id(x-1) + 1; [L13] RET, EXPR id(input) [L13] int result = id(input); [L14] COND TRUE result == 15 [L15] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 14 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 9.7s, OverallIterations: 7, TraceHistogramMax: 16, AutomataDifference: 1.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 54 SDtfs, 292 SDslu, 326 SDs, 0 SdLazy, 397 SolverSat, 185 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 522 GetRequests, 347 SyntacticMatches, 1 SemanticMatches, 174 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1504 ImplicationChecksByTransitivity, 2.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=56occurred in iteration=6, 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, 6 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 6.3s InterpolantComputationTime, 498 NumberOfCodeBlocks, 498 NumberOfCodeBlocksAsserted, 25 NumberOfCheckSat, 578 ConstructedInterpolants, 0 QuantifiedInterpolants, 69562 SizeOfPredicates, 24 NumberOfNonLiveVariables, 615 ConjunctsInSsa, 70 ConjunctsInUnsatCore, 16 InterpolantComputations, 1 PerfectInterpolantSequences, 651/1560 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...