./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive/MultCommutative-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 47ea0209 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/MultCommutative-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8 --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 ce29b37e076ab683230ebf17073db3b7759ea39570dd2ef64322b6d43bb636cd --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 01:58:01,181 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 01:58:01,185 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 01:58:01,254 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 01:58:01,255 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 01:58:01,260 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 01:58:01,262 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 01:58:01,267 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 01:58:01,270 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 01:58:01,277 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 01:58:01,278 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 01:58:01,281 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 01:58:01,281 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 01:58:01,285 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 01:58:01,287 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 01:58:01,293 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 01:58:01,295 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 01:58:01,297 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 01:58:01,300 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 01:58:01,310 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 01:58:01,312 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 01:58:01,314 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 01:58:01,318 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 01:58:01,319 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 01:58:01,327 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 01:58:01,327 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 01:58:01,328 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 01:58:01,329 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 01:58:01,330 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 01:58:01,331 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 01:58:01,332 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 01:58:01,333 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 01:58:01,334 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 01:58:01,335 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 01:58:01,337 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 01:58:01,337 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 01:58:01,338 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 01:58:01,338 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 01:58:01,338 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 01:58:01,340 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 01:58:01,341 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 01:58:01,342 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 01:58:01,370 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 01:58:01,371 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 01:58:01,372 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 01:58:01,372 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 01:58:01,373 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 01:58:01,373 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 01:58:01,373 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 01:58:01,373 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 01:58:01,374 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 01:58:01,374 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 01:58:01,374 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 01:58:01,374 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 01:58:01,375 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 01:58:01,375 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 01:58:01,375 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 01:58:01,376 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 01:58:01,377 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 01:58:01,377 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 01:58:01,377 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 01:58:01,377 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 01:58:01,378 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 01:58:01,378 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 01:58:01,378 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 01:58:01,379 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 01:58:01,379 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 01:58:01,379 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 01:58:01,379 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 01:58:01,380 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 01:58:01,380 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 01:58:01,380 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 01:58:01,381 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:58:01,381 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 01:58:01,381 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 01:58:01,382 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 01:58:01,382 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 01:58:01,382 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 01:58:01,382 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 01:58:01,383 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 01:58:01,383 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 01:58:01,383 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_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ce29b37e076ab683230ebf17073db3b7759ea39570dd2ef64322b6d43bb636cd [2021-11-07 01:58:01,699 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 01:58:01,727 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 01:58:01,731 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 01:58:01,732 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 01:58:01,733 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 01:58:01,734 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/recursive/MultCommutative-2.c [2021-11-07 01:58:01,816 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/data/f666ab984/443891018b694c18ac29d45ac9d481c8/FLAG98b51ce2b [2021-11-07 01:58:02,398 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 01:58:02,398 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/sv-benchmarks/c/recursive/MultCommutative-2.c [2021-11-07 01:58:02,412 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/data/f666ab984/443891018b694c18ac29d45ac9d481c8/FLAG98b51ce2b [2021-11-07 01:58:02,740 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/data/f666ab984/443891018b694c18ac29d45ac9d481c8 [2021-11-07 01:58:02,744 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 01:58:02,746 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 01:58:02,750 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 01:58:02,750 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 01:58:02,755 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 01:58:02,757 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:58:02" (1/1) ... [2021-11-07 01:58:02,760 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6fb8c57d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:58:02, skipping insertion in model container [2021-11-07 01:58:02,761 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:58:02" (1/1) ... [2021-11-07 01:58:02,770 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 01:58:02,790 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:58:03,033 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/sv-benchmarks/c/recursive/MultCommutative-2.c[970,983] [2021-11-07 01:58:03,037 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:58:03,057 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 01:58:03,077 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/sv-benchmarks/c/recursive/MultCommutative-2.c[970,983] [2021-11-07 01:58:03,081 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:58:03,110 INFO L208 MainTranslator]: Completed translation [2021-11-07 01:58:03,111 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:58:03 WrapperNode [2021-11-07 01:58:03,111 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 01:58:03,113 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 01:58:03,113 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 01:58:03,113 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 01:58:03,123 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:58:03" (1/1) ... [2021-11-07 01:58:03,134 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:58:03" (1/1) ... [2021-11-07 01:58:03,159 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 01:58:03,160 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 01:58:03,161 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 01:58:03,161 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 01:58:03,172 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:58:03" (1/1) ... [2021-11-07 01:58:03,173 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:58:03" (1/1) ... [2021-11-07 01:58:03,181 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:58:03" (1/1) ... [2021-11-07 01:58:03,182 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:58:03" (1/1) ... [2021-11-07 01:58:03,186 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:58:03" (1/1) ... [2021-11-07 01:58:03,188 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:58:03" (1/1) ... [2021-11-07 01:58:03,192 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:58:03" (1/1) ... [2021-11-07 01:58:03,203 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 01:58:03,205 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 01:58:03,206 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 01:58:03,206 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 01:58:03,207 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:58:03" (1/1) ... [2021-11-07 01:58:03,217 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:58:03,239 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:58:03,253 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 01:58:03,269 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 01:58:03,317 INFO L130 BoogieDeclarations]: Found specification of procedure mult [2021-11-07 01:58:03,318 INFO L138 BoogieDeclarations]: Found implementation of procedure mult [2021-11-07 01:58:03,325 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 01:58:03,326 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 01:58:03,326 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-07 01:58:03,326 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 01:58:03,689 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 01:58:03,689 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-07 01:58:03,692 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:58:03 BoogieIcfgContainer [2021-11-07 01:58:03,702 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 01:58:03,704 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 01:58:03,704 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 01:58:03,719 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 01:58:03,720 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:58:02" (1/3) ... [2021-11-07 01:58:03,721 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3b4485fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:58:03, skipping insertion in model container [2021-11-07 01:58:03,721 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:58:03" (2/3) ... [2021-11-07 01:58:03,722 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3b4485fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:58:03, skipping insertion in model container [2021-11-07 01:58:03,722 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:58:03" (3/3) ... [2021-11-07 01:58:03,724 INFO L111 eAbstractionObserver]: Analyzing ICFG MultCommutative-2.c [2021-11-07 01:58:03,731 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 01:58:03,731 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-07 01:58:03,811 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 01:58:03,821 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-07 01:58:03,837 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-07 01:58:03,859 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-07 01:58:03,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-07 01:58:03,869 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:58:03,870 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:58:03,871 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:58:03,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:58:03,879 INFO L85 PathProgramCache]: Analyzing trace with hash 647179642, now seen corresponding path program 1 times [2021-11-07 01:58:03,898 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:58:03,901 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1172056654] [2021-11-07 01:58:03,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:58:03,903 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:58:04,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:58:04,332 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-07 01:58:04,333 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:58:04,335 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1172056654] [2021-11-07 01:58:04,336 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1172056654] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:58:04,337 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:58:04,337 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-07 01:58:04,339 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [130879574] [2021-11-07 01:58:04,348 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-07 01:58:04,349 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:58:04,374 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-07 01:58:04,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-07 01:58:04,379 INFO L87 Difference]: Start difference. First operand has 21 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-07 01:58:04,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:58:04,517 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2021-11-07 01:58:04,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 01:58:04,519 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 19 [2021-11-07 01:58:04,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:58:04,529 INFO L225 Difference]: With dead ends: 39 [2021-11-07 01:58:04,529 INFO L226 Difference]: Without dead ends: 27 [2021-11-07 01:58:04,533 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-07 01:58:04,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-07 01:58:04,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 23. [2021-11-07 01:58:04,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 16 states have internal predecessors, (17), 5 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (9), 5 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-07 01:58:04,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 31 transitions. [2021-11-07 01:58:04,582 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 31 transitions. Word has length 19 [2021-11-07 01:58:04,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:58:04,583 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 31 transitions. [2021-11-07 01:58:04,583 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-07 01:58:04,583 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 31 transitions. [2021-11-07 01:58:04,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-07 01:58:04,586 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:58:04,586 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:58:04,587 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-07 01:58:04,587 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:58:04,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:58:04,588 INFO L85 PathProgramCache]: Analyzing trace with hash 1580415186, now seen corresponding path program 1 times [2021-11-07 01:58:04,588 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:58:04,589 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2026617172] [2021-11-07 01:58:04,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:58:04,589 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:58:04,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:58:04,690 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-07 01:58:04,690 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:58:04,690 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2026617172] [2021-11-07 01:58:04,691 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2026617172] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:58:04,691 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:58:04,691 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-07 01:58:04,692 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2007879424] [2021-11-07 01:58:04,693 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-07 01:58:04,693 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:58:04,694 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-07 01:58:04,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-07 01:58:04,695 INFO L87 Difference]: Start difference. First operand 23 states and 31 transitions. Second operand has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-07 01:58:04,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:58:04,753 INFO L93 Difference]: Finished difference Result 36 states and 49 transitions. [2021-11-07 01:58:04,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 01:58:04,754 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 25 [2021-11-07 01:58:04,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:58:04,756 INFO L225 Difference]: With dead ends: 36 [2021-11-07 01:58:04,756 INFO L226 Difference]: Without dead ends: 32 [2021-11-07 01:58:04,757 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-07 01:58:04,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-07 01:58:04,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 24. [2021-11-07 01:58:04,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 5 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (9), 6 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-07 01:58:04,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2021-11-07 01:58:04,769 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 25 [2021-11-07 01:58:04,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:58:04,769 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2021-11-07 01:58:04,770 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-07 01:58:04,770 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2021-11-07 01:58:04,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-07 01:58:04,772 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:58:04,772 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:58:04,772 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-07 01:58:04,773 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:58:04,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:58:04,774 INFO L85 PathProgramCache]: Analyzing trace with hash -124187766, now seen corresponding path program 1 times [2021-11-07 01:58:04,774 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:58:04,774 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1627185485] [2021-11-07 01:58:04,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:58:04,775 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:58:04,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:58:04,879 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-07 01:58:04,880 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:58:04,880 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1627185485] [2021-11-07 01:58:04,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1627185485] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:58:04,881 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [949740998] [2021-11-07 01:58:04,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:58:04,882 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:58:04,882 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:58:04,884 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:58:04,893 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-07 01:58:04,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:58:04,944 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:58:04,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:58:05,163 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-07 01:58:05,163 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:58:05,333 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-07 01:58:05,333 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [949740998] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:58:05,334 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1681267515] [2021-11-07 01:58:05,371 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-07 01:58:05,371 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:58:05,376 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-07 01:58:05,409 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:58:05,410 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 6 [2021-11-07 01:58:05,410 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1809628438] [2021-11-07 01:58:05,411 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:58:05,411 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:58:05,412 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:58:05,412 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:58:05,412 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-07 01:58:05,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:58:05,501 INFO L93 Difference]: Finished difference Result 32 states and 46 transitions. [2021-11-07 01:58:05,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 01:58:05,503 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2021-11-07 01:58:05,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:58:05,505 INFO L225 Difference]: With dead ends: 32 [2021-11-07 01:58:05,505 INFO L226 Difference]: Without dead ends: 24 [2021-11-07 01:58:05,506 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2021-11-07 01:58:05,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-07 01:58:05,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2021-11-07 01:58:05,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 15 states have internal predecessors, (16), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-07 01:58:05,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 27 transitions. [2021-11-07 01:58:05,516 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 27 transitions. Word has length 26 [2021-11-07 01:58:05,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:58:05,517 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 27 transitions. [2021-11-07 01:58:05,518 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-07 01:58:05,520 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 27 transitions. [2021-11-07 01:58:05,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-07 01:58:05,523 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:58:05,523 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:58:05,569 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-07 01:58:05,744 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:58:05,745 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:58:05,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:58:05,746 INFO L85 PathProgramCache]: Analyzing trace with hash -590605896, now seen corresponding path program 2 times [2021-11-07 01:58:05,746 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:58:05,746 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [121993228] [2021-11-07 01:58:05,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:58:05,747 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:58:05,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:58:05,857 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-07 01:58:05,857 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:58:05,857 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [121993228] [2021-11-07 01:58:05,858 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [121993228] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:58:05,858 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:58:05,858 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-07 01:58:05,858 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2112524373] [2021-11-07 01:58:05,859 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 01:58:05,859 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:58:05,860 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 01:58:05,860 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-07 01:58:05,860 INFO L87 Difference]: Start difference. First operand 21 states and 27 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-07 01:58:05,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:58:05,935 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2021-11-07 01:58:05,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 01:58:05,936 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 26 [2021-11-07 01:58:05,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:58:05,937 INFO L225 Difference]: With dead ends: 25 [2021-11-07 01:58:05,938 INFO L226 Difference]: Without dead ends: 21 [2021-11-07 01:58:05,938 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:58:05,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-07 01:58:05,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-07 01:58:05,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 15 states have internal predecessors, (16), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-07 01:58:05,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2021-11-07 01:58:05,943 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 26 [2021-11-07 01:58:05,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:58:05,944 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2021-11-07 01:58:05,944 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-07 01:58:05,944 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2021-11-07 01:58:05,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-07 01:58:05,946 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:58:05,946 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:58:05,946 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-07 01:58:05,947 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:58:05,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:58:05,948 INFO L85 PathProgramCache]: Analyzing trace with hash 132154764, now seen corresponding path program 3 times [2021-11-07 01:58:05,948 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:58:05,961 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [302288248] [2021-11-07 01:58:05,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:58:05,961 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:58:06,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:58:06,516 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 22 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 01:58:06,516 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:58:06,517 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [302288248] [2021-11-07 01:58:06,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [302288248] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:58:06,517 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2031327713] [2021-11-07 01:58:06,518 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 01:58:06,518 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:58:06,518 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:58:06,520 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:58:06,541 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-07 01:58:06,636 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 01:58:06,637 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:58:06,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-07 01:58:06,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:58:07,325 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-07 01:58:07,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:58:09,028 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:58:09,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2031327713] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:58:09,029 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1704038609] [2021-11-07 01:58:09,033 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-07 01:58:09,033 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:58:09,034 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-07 01:58:09,036 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:58:09,036 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 11, 14] total 35 [2021-11-07 01:58:09,037 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [113957209] [2021-11-07 01:58:09,038 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-07 01:58:09,038 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:58:09,039 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-07 01:58:09,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1061, Unknown=0, NotChecked=0, Total=1190 [2021-11-07 01:58:09,041 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 35 states, 32 states have (on average 1.53125) internal successors, (49), 24 states have internal predecessors, (49), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (11), 11 states have call predecessors, (11), 9 states have call successors, (11) [2021-11-07 01:58:10,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:58:10,104 INFO L93 Difference]: Finished difference Result 39 states and 49 transitions. [2021-11-07 01:58:10,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-07 01:58:10,105 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 32 states have (on average 1.53125) internal successors, (49), 24 states have internal predecessors, (49), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (11), 11 states have call predecessors, (11), 9 states have call successors, (11) Word has length 33 [2021-11-07 01:58:10,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:58:10,107 INFO L225 Difference]: With dead ends: 39 [2021-11-07 01:58:10,107 INFO L226 Difference]: Without dead ends: 35 [2021-11-07 01:58:10,113 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 47 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 393 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=293, Invalid=1777, Unknown=0, NotChecked=0, Total=2070 [2021-11-07 01:58:10,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-07 01:58:10,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 28. [2021-11-07 01:58:10,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 20 states have internal predecessors, (20), 5 states have call successors, (5), 1 states have call predecessors, (5), 4 states have return successors, (13), 6 states have call predecessors, (13), 5 states have call successors, (13) [2021-11-07 01:58:10,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions. [2021-11-07 01:58:10,127 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 33 [2021-11-07 01:58:10,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:58:10,127 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 38 transitions. [2021-11-07 01:58:10,128 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 32 states have (on average 1.53125) internal successors, (49), 24 states have internal predecessors, (49), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (11), 11 states have call predecessors, (11), 9 states have call successors, (11) [2021-11-07 01:58:10,128 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions. [2021-11-07 01:58:10,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-07 01:58:10,130 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:58:10,131 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:58:10,162 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-07 01:58:10,345 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:58:10,345 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:58:10,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:58:10,346 INFO L85 PathProgramCache]: Analyzing trace with hash 169705396, now seen corresponding path program 1 times [2021-11-07 01:58:10,346 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:58:10,347 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2107738428] [2021-11-07 01:58:10,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:58:10,347 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:58:10,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:58:10,440 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-07 01:58:10,440 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:58:10,441 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2107738428] [2021-11-07 01:58:10,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2107738428] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:58:10,441 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [918268085] [2021-11-07 01:58:10,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:58:10,441 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:58:10,442 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:58:10,443 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:58:10,452 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-07 01:58:10,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:58:10,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 01:58:10,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:58:10,755 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-07 01:58:10,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:58:11,062 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-07 01:58:11,062 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [918268085] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:58:11,062 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1786471028] [2021-11-07 01:58:11,066 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2021-11-07 01:58:11,066 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:58:11,066 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-07 01:58:11,067 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:58:11,067 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 10 [2021-11-07 01:58:11,067 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126336526] [2021-11-07 01:58:11,068 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 01:58:11,068 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:58:11,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 01:58:11,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-07 01:58:11,070 INFO L87 Difference]: Start difference. First operand 28 states and 38 transitions. Second operand has 10 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 10 states have internal predecessors, (32), 5 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-07 01:58:11,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:58:11,225 INFO L93 Difference]: Finished difference Result 56 states and 82 transitions. [2021-11-07 01:58:11,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-07 01:58:11,226 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 10 states have internal predecessors, (32), 5 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 39 [2021-11-07 01:58:11,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:58:11,227 INFO L225 Difference]: With dead ends: 56 [2021-11-07 01:58:11,227 INFO L226 Difference]: Without dead ends: 24 [2021-11-07 01:58:11,229 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 75 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=81, Invalid=159, Unknown=0, NotChecked=0, Total=240 [2021-11-07 01:58:11,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-07 01:58:11,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-11-07 01:58:11,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.0625) internal successors, (17), 17 states have internal predecessors, (17), 4 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-07 01:58:11,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2021-11-07 01:58:11,237 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 39 [2021-11-07 01:58:11,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:58:11,238 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2021-11-07 01:58:11,238 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 10 states have internal predecessors, (32), 5 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-07 01:58:11,238 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2021-11-07 01:58:11,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-07 01:58:11,240 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:58:11,241 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 5, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:58:11,289 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-07 01:58:11,458 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:58:11,458 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:58:11,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:58:11,459 INFO L85 PathProgramCache]: Analyzing trace with hash 735115528, now seen corresponding path program 4 times [2021-11-07 01:58:11,459 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:58:11,460 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [973792194] [2021-11-07 01:58:11,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:58:11,460 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:58:11,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:58:12,081 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 4 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:58:12,082 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:58:12,082 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [973792194] [2021-11-07 01:58:12,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [973792194] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:58:12,082 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [831189517] [2021-11-07 01:58:12,082 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 01:58:12,083 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:58:12,083 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:58:12,086 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:58:12,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-07 01:58:12,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:58:12,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-07 01:58:12,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:58:13,259 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 7 proven. 31 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-07 01:58:13,260 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:58:15,187 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 9 proven. 37 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:58:15,188 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [831189517] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:58:15,188 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [882326878] [2021-11-07 01:58:15,197 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-07 01:58:15,197 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:58:15,198 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-07 01:58:15,200 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:58:15,202 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18, 22] total 48 [2021-11-07 01:58:15,202 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [365093889] [2021-11-07 01:58:15,206 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-07 01:58:15,207 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:58:15,208 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-07 01:58:15,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=2063, Unknown=0, NotChecked=0, Total=2256 [2021-11-07 01:58:15,210 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand has 48 states, 43 states have (on average 1.5348837209302326) internal successors, (66), 34 states have internal predecessors, (66), 12 states have call successors, (12), 1 states have call predecessors, (12), 8 states have return successors, (15), 14 states have call predecessors, (15), 12 states have call successors, (15) [2021-11-07 01:58:16,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:58:16,534 INFO L93 Difference]: Finished difference Result 48 states and 58 transitions. [2021-11-07 01:58:16,535 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-07 01:58:16,536 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 43 states have (on average 1.5348837209302326) internal successors, (66), 34 states have internal predecessors, (66), 12 states have call successors, (12), 1 states have call predecessors, (12), 8 states have return successors, (15), 14 states have call predecessors, (15), 12 states have call successors, (15) Word has length 40 [2021-11-07 01:58:16,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:58:16,538 INFO L225 Difference]: With dead ends: 48 [2021-11-07 01:58:16,538 INFO L226 Difference]: Without dead ends: 40 [2021-11-07 01:58:16,548 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 48 SyntacticMatches, 4 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 926 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=526, Invalid=3764, Unknown=0, NotChecked=0, Total=4290 [2021-11-07 01:58:16,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-07 01:58:16,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 31. [2021-11-07 01:58:16,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 22 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 4 states have return successors, (12), 6 states have call predecessors, (12), 5 states have call successors, (12) [2021-11-07 01:58:16,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 40 transitions. [2021-11-07 01:58:16,570 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 40 transitions. Word has length 40 [2021-11-07 01:58:16,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:58:16,570 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 40 transitions. [2021-11-07 01:58:16,571 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 43 states have (on average 1.5348837209302326) internal successors, (66), 34 states have internal predecessors, (66), 12 states have call successors, (12), 1 states have call predecessors, (12), 8 states have return successors, (15), 14 states have call predecessors, (15), 12 states have call successors, (15) [2021-11-07 01:58:16,573 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 40 transitions. [2021-11-07 01:58:16,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-07 01:58:16,583 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:58:16,584 INFO L513 BasicCegarLoop]: trace histogram [7, 7, 7, 5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:58:16,630 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-07 01:58:16,784 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-07 01:58:16,784 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:58:16,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:58:16,785 INFO L85 PathProgramCache]: Analyzing trace with hash -1490504886, now seen corresponding path program 5 times [2021-11-07 01:58:16,785 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:58:16,785 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [602194022] [2021-11-07 01:58:16,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:58:16,785 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:58:16,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:58:17,733 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-07 01:58:17,733 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:58:17,733 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [602194022] [2021-11-07 01:58:17,734 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [602194022] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:58:17,734 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [196290033] [2021-11-07 01:58:17,734 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:58:17,734 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:58:17,734 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:58:17,736 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:58:17,764 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-07 01:58:18,029 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-07 01:58:18,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:58:18,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 85 conjunts are in the unsatisfiable core [2021-11-07 01:58:18,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:58:19,183 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 3 proven. 61 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2021-11-07 01:58:19,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:58:25,851 WARN L838 $PredicateComparison]: unable to prove that (and (<= 0 |c_mult_#in~m|) (forall ((v_mult_~n_BEFORE_CALL_20 Int) (|aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_121_145| Int) (|aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_121_145| Int) (|aux_div_v_mult_#in~n_BEFORE_CALL_20_90| Int) (|aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_121| Int)) (let ((.cse3 (* 3 |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_121_145|))) (let ((.cse1 (* 3 |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_121|)) (.cse0 (+ |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_121_145| |c_mult_#res| .cse3)) (.cse2 (div (+ (- 1) (* v_mult_~n_BEFORE_CALL_20 2) (* |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_121_145| (- 6)) (* |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_121_145| (- 2))) (- 3))) (.cse4 (div (+ (- 1) (* v_mult_~n_BEFORE_CALL_20 (- 2)) (* |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_121_145| 6) (* |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_121_145| 2)) 3))) (or (< .cse0 .cse1) (< (+ |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_121_145| 1) .cse2) (<= .cse2 (+ |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_121| 1)) (< (* 3 |aux_div_v_mult_#in~n_BEFORE_CALL_20_90|) (+ |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_121_145| .cse3)) (< (+ .cse4 1) |aux_div_v_mult_#in~n_BEFORE_CALL_20_90|) (<= (+ .cse1 3) .cse0) (< |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_121_145| 0) (< .cse2 (+ 2 .cse4)))))) (forall ((v_mult_~n_BEFORE_CALL_20 Int) (|aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109_163| Int) (|aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109| Int) (|aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109_163| Int) (|aux_div_v_mult_#in~n_BEFORE_CALL_20_90| Int)) (let ((.cse6 (div (+ (* |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109_163| 6) (- 1) (* v_mult_~n_BEFORE_CALL_20 (- 2)) (* |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109_163| (- 2)) (* |c_mult_#res| (- 2))) 3))) (let ((.cse5 (div (+ (* |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109_163| (- 6)) (- 1) (* |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109_163| 2) (* v_mult_~n_BEFORE_CALL_20 2) (* |c_mult_#res| 2)) (- 3))) (.cse8 (* 3 |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109_163|)) (.cse7 (+ .cse6 1))) (or (< .cse5 (+ 2 .cse6)) (<= 3 |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109_163|) (<= |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109_163| .cse7) (< (+ |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109_163| |c_mult_#res| (* 3 |aux_div_v_mult_#in~n_BEFORE_CALL_20_90|)) .cse8) (< |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109_163| 0) (< (+ |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109| 1) .cse5) (< .cse8 (+ |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109_163| |c_mult_#res| (* 3 |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_20_90_109|))) (< .cse7 |aux_div_v_mult_#in~n_BEFORE_CALL_20_90|))))) (<= |c_mult_#in~m| 0)) is different from false [2021-11-07 01:58:26,814 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 20 proven. 70 refuted. 0 times theorem prover too weak. 23 trivial. 12 not checked. [2021-11-07 01:58:26,814 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [196290033] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:58:26,814 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1125664748] [2021-11-07 01:58:26,821 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-07 01:58:26,822 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:58:26,822 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-07 01:58:26,824 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:58:26,824 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 16, 25] total 58 [2021-11-07 01:58:26,824 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895744382] [2021-11-07 01:58:26,826 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-07 01:58:26,827 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:58:26,828 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-07 01:58:26,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=2998, Unknown=1, NotChecked=110, Total=3306 [2021-11-07 01:58:26,831 INFO L87 Difference]: Start difference. First operand 31 states and 40 transitions. Second operand has 58 states, 53 states have (on average 1.509433962264151) internal successors, (80), 40 states have internal predecessors, (80), 15 states have call successors, (15), 1 states have call predecessors, (15), 13 states have return successors, (19), 18 states have call predecessors, (19), 15 states have call successors, (19) [2021-11-07 01:58:29,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:58:29,763 INFO L93 Difference]: Finished difference Result 60 states and 79 transitions. [2021-11-07 01:58:29,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-07 01:58:29,764 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 53 states have (on average 1.509433962264151) internal successors, (80), 40 states have internal predecessors, (80), 15 states have call successors, (15), 1 states have call predecessors, (15), 13 states have return successors, (19), 18 states have call predecessors, (19), 15 states have call successors, (19) Word has length 54 [2021-11-07 01:58:29,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:58:29,766 INFO L225 Difference]: With dead ends: 60 [2021-11-07 01:58:29,766 INFO L226 Difference]: Without dead ends: 49 [2021-11-07 01:58:29,771 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 76 SyntacticMatches, 3 SemanticMatches, 81 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1347 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=736, Invalid=5909, Unknown=1, NotChecked=160, Total=6806 [2021-11-07 01:58:29,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-07 01:58:29,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 34. [2021-11-07 01:58:29,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 24 states have internal predecessors, (25), 5 states have call successors, (5), 2 states have call predecessors, (5), 5 states have return successors, (14), 7 states have call predecessors, (14), 5 states have call successors, (14) [2021-11-07 01:58:29,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 44 transitions. [2021-11-07 01:58:29,781 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 44 transitions. Word has length 54 [2021-11-07 01:58:29,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:58:29,782 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 44 transitions. [2021-11-07 01:58:29,782 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 53 states have (on average 1.509433962264151) internal successors, (80), 40 states have internal predecessors, (80), 15 states have call successors, (15), 1 states have call predecessors, (15), 13 states have return successors, (19), 18 states have call predecessors, (19), 15 states have call successors, (19) [2021-11-07 01:58:29,782 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 44 transitions. [2021-11-07 01:58:29,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-07 01:58:29,785 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:58:29,785 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 6, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:58:29,828 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-07 01:58:29,998 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:58:29,998 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:58:29,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:58:29,999 INFO L85 PathProgramCache]: Analyzing trace with hash -140737028, now seen corresponding path program 6 times [2021-11-07 01:58:29,999 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:58:29,999 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1330085837] [2021-11-07 01:58:29,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:58:29,999 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:58:30,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:58:30,472 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 2 proven. 66 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-07 01:58:30,473 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:58:30,473 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1330085837] [2021-11-07 01:58:30,473 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1330085837] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:58:30,473 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1638045582] [2021-11-07 01:58:30,473 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 01:58:30,473 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:58:30,473 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:58:30,476 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:58:30,476 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-07 01:58:30,808 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 01:58:30,809 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:58:30,811 INFO L263 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-07 01:58:30,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:58:31,649 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-07 01:58:31,649 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:58:33,503 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-07 01:58:33,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1638045582] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:58:33,504 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1887396320] [2021-11-07 01:58:33,505 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-07 01:58:33,506 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:58:33,506 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-07 01:58:33,507 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:58:33,507 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21, 23] total 56 [2021-11-07 01:58:33,508 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [211567659] [2021-11-07 01:58:33,508 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-07 01:58:33,508 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:58:33,509 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-07 01:58:33,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=2867, Unknown=0, NotChecked=0, Total=3080 [2021-11-07 01:58:33,511 INFO L87 Difference]: Start difference. First operand 34 states and 44 transitions. Second operand has 56 states, 52 states have (on average 1.5192307692307692) internal successors, (79), 38 states have internal predecessors, (79), 14 states have call successors, (14), 1 states have call predecessors, (14), 12 states have return successors, (18), 18 states have call predecessors, (18), 14 states have call successors, (18) [2021-11-07 01:58:34,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:58:34,839 INFO L93 Difference]: Finished difference Result 54 states and 70 transitions. [2021-11-07 01:58:34,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-07 01:58:34,839 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 52 states have (on average 1.5192307692307692) internal successors, (79), 38 states have internal predecessors, (79), 14 states have call successors, (14), 1 states have call predecessors, (14), 12 states have return successors, (18), 18 states have call predecessors, (18), 14 states have call successors, (18) Word has length 47 [2021-11-07 01:58:34,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:58:34,840 INFO L225 Difference]: With dead ends: 54 [2021-11-07 01:58:34,841 INFO L226 Difference]: Without dead ends: 45 [2021-11-07 01:58:34,843 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1330 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=705, Invalid=5301, Unknown=0, NotChecked=0, Total=6006 [2021-11-07 01:58:34,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-07 01:58:34,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 34. [2021-11-07 01:58:34,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 24 states have internal predecessors, (25), 5 states have call successors, (5), 2 states have call predecessors, (5), 5 states have return successors, (13), 7 states have call predecessors, (13), 5 states have call successors, (13) [2021-11-07 01:58:34,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 43 transitions. [2021-11-07 01:58:34,850 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 43 transitions. Word has length 47 [2021-11-07 01:58:34,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:58:34,851 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 43 transitions. [2021-11-07 01:58:34,851 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 52 states have (on average 1.5192307692307692) internal successors, (79), 38 states have internal predecessors, (79), 14 states have call successors, (14), 1 states have call predecessors, (14), 12 states have return successors, (18), 18 states have call predecessors, (18), 14 states have call successors, (18) [2021-11-07 01:58:34,851 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 43 transitions. [2021-11-07 01:58:34,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-07 01:58:34,853 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:58:34,853 INFO L513 BasicCegarLoop]: trace histogram [8, 8, 8, 6, 6, 6, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:58:34,884 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-07 01:58:35,073 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:58:35,073 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:58:35,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:58:35,074 INFO L85 PathProgramCache]: Analyzing trace with hash -87767316, now seen corresponding path program 7 times [2021-11-07 01:58:35,074 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:58:35,075 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1483586066] [2021-11-07 01:58:35,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:58:35,075 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:58:35,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:58:35,847 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 4 proven. 138 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 01:58:35,848 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:58:35,848 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1483586066] [2021-11-07 01:58:35,848 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1483586066] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:58:35,848 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [472258146] [2021-11-07 01:58:35,848 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 01:58:35,848 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:58:35,848 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:58:35,857 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:58:35,861 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-07 01:58:36,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:58:36,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 93 conjunts are in the unsatisfiable core [2021-11-07 01:58:36,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:58:37,723 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 32 proven. 80 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2021-11-07 01:58:37,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:58:41,722 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 8 proven. 134 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-07 01:58:41,723 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [472258146] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:58:41,723 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [203239412] [2021-11-07 01:58:41,731 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-07 01:58:41,731 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:58:41,731 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-07 01:58:41,733 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:58:41,733 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 25, 29] total 73 [2021-11-07 01:58:41,736 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733835440] [2021-11-07 01:58:41,738 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-07 01:58:41,739 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:58:41,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-07 01:58:41,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=5006, Unknown=0, NotChecked=0, Total=5256 [2021-11-07 01:58:41,744 INFO L87 Difference]: Start difference. First operand 34 states and 43 transitions. Second operand has 73 states, 70 states have (on average 1.5285714285714285) internal successors, (107), 49 states have internal predecessors, (107), 18 states have call successors, (18), 1 states have call predecessors, (18), 20 states have return successors, (24), 24 states have call predecessors, (24), 18 states have call successors, (24) [2021-11-07 01:58:45,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:58:45,583 INFO L93 Difference]: Finished difference Result 89 states and 119 transitions. [2021-11-07 01:58:45,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-07 01:58:45,584 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 70 states have (on average 1.5285714285714285) internal successors, (107), 49 states have internal predecessors, (107), 18 states have call successors, (18), 1 states have call predecessors, (18), 20 states have return successors, (24), 24 states have call predecessors, (24), 18 states have call successors, (24) Word has length 61 [2021-11-07 01:58:45,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:58:45,586 INFO L225 Difference]: With dead ends: 89 [2021-11-07 01:58:45,587 INFO L226 Difference]: Without dead ends: 81 [2021-11-07 01:58:45,591 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2200 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=1026, Invalid=9894, Unknown=0, NotChecked=0, Total=10920 [2021-11-07 01:58:45,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-11-07 01:58:45,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 67. [2021-11-07 01:58:45,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 45 states have (on average 1.0888888888888888) internal successors, (49), 46 states have internal predecessors, (49), 9 states have call successors, (9), 4 states have call predecessors, (9), 12 states have return successors, (36), 16 states have call predecessors, (36), 9 states have call successors, (36) [2021-11-07 01:58:45,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 94 transitions. [2021-11-07 01:58:45,605 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 94 transitions. Word has length 61 [2021-11-07 01:58:45,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:58:45,606 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 94 transitions. [2021-11-07 01:58:45,606 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 70 states have (on average 1.5285714285714285) internal successors, (107), 49 states have internal predecessors, (107), 18 states have call successors, (18), 1 states have call predecessors, (18), 20 states have return successors, (24), 24 states have call predecessors, (24), 18 states have call successors, (24) [2021-11-07 01:58:45,606 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 94 transitions. [2021-11-07 01:58:45,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-07 01:58:45,608 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:58:45,608 INFO L513 BasicCegarLoop]: trace histogram [12, 12, 12, 10, 10, 10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:58:45,631 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-07 01:58:45,817 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:58:45,817 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:58:45,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:58:45,818 INFO L85 PathProgramCache]: Analyzing trace with hash -943012406, now seen corresponding path program 8 times [2021-11-07 01:58:45,818 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:58:45,818 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [662210690] [2021-11-07 01:58:45,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:58:45,818 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:58:45,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:58:47,135 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 347 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2021-11-07 01:58:47,135 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:58:47,135 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [662210690] [2021-11-07 01:58:47,135 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [662210690] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:58:47,135 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [765199985] [2021-11-07 01:58:47,135 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:58:47,136 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:58:47,136 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:58:47,137 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:58:47,138 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-07 01:58:47,747 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-07 01:58:47,748 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:58:47,751 WARN L261 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 145 conjunts are in the unsatisfiable core [2021-11-07 01:58:47,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:58:49,584 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 6 proven. 197 refuted. 0 times theorem prover too weak. 217 trivial. 0 not checked. [2021-11-07 01:58:49,584 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:59:10,708 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [|aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_58_60_158|, |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_58_60_158_166|, |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_58_60_158_166|] [2021-11-07 01:59:10,708 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1410572372] [2021-11-07 01:59:10,712 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-07 01:59:10,713 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:59:10,713 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-07 01:59:10,715 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-11-07 01:59:10,716 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2021-11-07 01:59:10,716 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [752504385] [2021-11-07 01:59:10,717 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-07 01:59:10,718 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:59:10,718 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-07 01:59:10,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=7003, Unknown=7, NotChecked=0, Total=7310 [2021-11-07 01:59:10,722 INFO L87 Difference]: Start difference. First operand 67 states and 94 transitions. Second operand has 41 states, 38 states have (on average 1.5263157894736843) internal successors, (58), 29 states have internal predecessors, (58), 11 states have call successors, (11), 1 states have call predecessors, (11), 11 states have return successors, (12), 12 states have call predecessors, (12), 11 states have call successors, (12) [2021-11-07 01:59:13,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:59:13,224 INFO L93 Difference]: Finished difference Result 80 states and 113 transitions. [2021-11-07 01:59:13,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-07 01:59:13,224 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 38 states have (on average 1.5263157894736843) internal successors, (58), 29 states have internal predecessors, (58), 11 states have call successors, (11), 1 states have call predecessors, (11), 11 states have return successors, (12), 12 states have call predecessors, (12), 11 states have call successors, (12) Word has length 89 [2021-11-07 01:59:13,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:59:13,226 INFO L225 Difference]: With dead ends: 80 [2021-11-07 01:59:13,227 INFO L226 Difference]: Without dead ends: 76 [2021-11-07 01:59:13,231 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 110 SyntacticMatches, 4 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2138 ImplicationChecksByTransitivity, 18.4s TimeCoverageRelationStatistics Valid=829, Invalid=9670, Unknown=7, NotChecked=0, Total=10506 [2021-11-07 01:59:13,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-11-07 01:59:13,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 72. [2021-11-07 01:59:13,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 48 states have (on average 1.0833333333333333) internal successors, (52), 49 states have internal predecessors, (52), 10 states have call successors, (10), 4 states have call predecessors, (10), 13 states have return successors, (44), 18 states have call predecessors, (44), 10 states have call successors, (44) [2021-11-07 01:59:13,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 106 transitions. [2021-11-07 01:59:13,246 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 106 transitions. Word has length 89 [2021-11-07 01:59:13,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:59:13,247 INFO L470 AbstractCegarLoop]: Abstraction has 72 states and 106 transitions. [2021-11-07 01:59:13,247 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 38 states have (on average 1.5263157894736843) internal successors, (58), 29 states have internal predecessors, (58), 11 states have call successors, (11), 1 states have call predecessors, (11), 11 states have return successors, (12), 12 states have call predecessors, (12), 11 states have call successors, (12) [2021-11-07 01:59:13,248 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 106 transitions. [2021-11-07 01:59:13,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-07 01:59:13,249 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:59:13,249 INFO L513 BasicCegarLoop]: trace histogram [10, 10, 10, 8, 8, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:59:13,289 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-07 01:59:13,473 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-07 01:59:13,473 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:59:13,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:59:13,473 INFO L85 PathProgramCache]: Analyzing trace with hash 1637495290, now seen corresponding path program 9 times [2021-11-07 01:59:13,473 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:59:13,473 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1684539798] [2021-11-07 01:59:13,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:59:13,474 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:59:13,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:59:14,050 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 0 proven. 208 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2021-11-07 01:59:14,050 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:59:14,050 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1684539798] [2021-11-07 01:59:14,051 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1684539798] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:59:14,051 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1068013431] [2021-11-07 01:59:14,051 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 01:59:14,051 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:59:14,051 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:59:14,052 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:59:14,053 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-07 01:59:14,904 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 01:59:14,905 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:59:14,907 WARN L261 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 121 conjunts are in the unsatisfiable core [2021-11-07 01:59:14,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:59:15,974 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 4 proven. 132 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-11-07 01:59:15,974 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:59:19,181 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 17 proven. 197 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-11-07 01:59:19,181 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1068013431] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:59:19,182 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [58356591] [2021-11-07 01:59:19,184 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-07 01:59:19,185 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:59:19,185 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-07 01:59:19,194 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:59:19,194 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 18, 24] total 53 [2021-11-07 01:59:19,194 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759108532] [2021-11-07 01:59:19,195 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-07 01:59:19,195 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:59:19,196 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-07 01:59:19,196 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=2575, Unknown=0, NotChecked=0, Total=2756 [2021-11-07 01:59:19,197 INFO L87 Difference]: Start difference. First operand 72 states and 106 transitions. Second operand has 53 states, 49 states have (on average 1.510204081632653) internal successors, (74), 35 states have internal predecessors, (74), 14 states have call successors, (14), 1 states have call predecessors, (14), 11 states have return successors, (19), 18 states have call predecessors, (19), 14 states have call successors, (19) [2021-11-07 01:59:20,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:59:20,795 INFO L93 Difference]: Finished difference Result 80 states and 113 transitions. [2021-11-07 01:59:20,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-07 01:59:20,796 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 49 states have (on average 1.510204081632653) internal successors, (74), 35 states have internal predecessors, (74), 14 states have call successors, (14), 1 states have call predecessors, (14), 11 states have return successors, (19), 18 states have call predecessors, (19), 14 states have call successors, (19) Word has length 75 [2021-11-07 01:59:20,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:59:20,797 INFO L225 Difference]: With dead ends: 80 [2021-11-07 01:59:20,798 INFO L226 Difference]: Without dead ends: 70 [2021-11-07 01:59:20,799 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 131 SyntacticMatches, 4 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1159 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=531, Invalid=4581, Unknown=0, NotChecked=0, Total=5112 [2021-11-07 01:59:20,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-07 01:59:20,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2021-11-07 01:59:20,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 47 states have (on average 1.0851063829787233) internal successors, (51), 48 states have internal predecessors, (51), 9 states have call successors, (9), 4 states have call predecessors, (9), 13 states have return successors, (37), 17 states have call predecessors, (37), 9 states have call successors, (37) [2021-11-07 01:59:20,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 97 transitions. [2021-11-07 01:59:20,876 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 97 transitions. Word has length 75 [2021-11-07 01:59:20,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:59:20,877 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 97 transitions. [2021-11-07 01:59:20,877 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 49 states have (on average 1.510204081632653) internal successors, (74), 35 states have internal predecessors, (74), 14 states have call successors, (14), 1 states have call predecessors, (14), 11 states have return successors, (19), 18 states have call predecessors, (19), 14 states have call successors, (19) [2021-11-07 01:59:20,877 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 97 transitions. [2021-11-07 01:59:20,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-07 01:59:20,879 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:59:20,879 INFO L513 BasicCegarLoop]: trace histogram [10, 10, 10, 8, 8, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:59:20,930 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-07 01:59:21,079 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-07 01:59:21,080 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:59:21,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:59:21,080 INFO L85 PathProgramCache]: Analyzing trace with hash -335813798, now seen corresponding path program 10 times [2021-11-07 01:59:21,080 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:59:21,081 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [821484125] [2021-11-07 01:59:21,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:59:21,081 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:59:21,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:59:22,137 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 0 proven. 232 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2021-11-07 01:59:22,137 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:59:22,137 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [821484125] [2021-11-07 01:59:22,137 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [821484125] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:59:22,137 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1246824512] [2021-11-07 01:59:22,137 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 01:59:22,138 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:59:22,138 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:59:22,138 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:59:22,142 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-07 01:59:22,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:59:23,001 WARN L261 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 121 conjunts are in the unsatisfiable core [2021-11-07 01:59:23,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:59:24,677 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 6 proven. 136 refuted. 0 times theorem prover too weak. 139 trivial. 0 not checked. [2021-11-07 01:59:24,678 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:59:32,579 WARN L838 $PredicateComparison]: unable to prove that (and (<= 0 |c_mult_#in~m|) (forall ((|aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109_135| Int) (|aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109_135| Int) (v_mult_~n_BEFORE_CALL_91 Int) (|aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109| Int) (|aux_div_v_mult_#in~n_BEFORE_CALL_91_90| Int)) (let ((.cse0 (+ (* 6 |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109_135|) |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109_135|)) (.cse2 (div (+ (- 1) (* v_mult_~n_BEFORE_CALL_91 2) (* |c_mult_#res| 2) (* |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109_135| (- 12)) (* |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109_135| (- 2))) (- 6))) (.cse1 (div (+ (- 1) (* |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109_135| 2) (* v_mult_~n_BEFORE_CALL_91 (- 2)) (* |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109_135| 12) (* |c_mult_#res| (- 2))) 6))) (or (< (+ (* 6 |aux_div_v_mult_#in~n_BEFORE_CALL_91_90|) |c_mult_#res|) .cse0) (< .cse0 (+ |c_mult_#res| (* 6 |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109|))) (< (+ .cse1 1) |aux_div_v_mult_#in~n_BEFORE_CALL_91_90|) (<= 6 |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109_135|) (<= .cse2 (+ 1 |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109_135|)) (< |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109_135| 0) (< (+ |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109| 1) .cse2) (< .cse2 (+ .cse1 2))))) (forall ((|aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109_163| Int) (|aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109_163| Int) (v_mult_~n_BEFORE_CALL_91 Int) (|aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109| Int) (|aux_div_v_mult_#in~n_BEFORE_CALL_91_90| Int)) (let ((.cse6 (div (+ (* |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109_163| (- 2)) (- 1) (* |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109_163| 12) (* v_mult_~n_BEFORE_CALL_91 (- 2)) (* |c_mult_#res| (- 2))) 6))) (let ((.cse5 (div (+ (- 1) (* v_mult_~n_BEFORE_CALL_91 2) (* |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109_163| 2) (* |c_mult_#res| 2) (* |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109_163| (- 12))) (- 6))) (.cse3 (* 6 |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109_163|)) (.cse4 (+ .cse6 1))) (or (< .cse3 (+ |c_mult_#res| |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109_163| (* 6 |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109|))) (< .cse4 |aux_div_v_mult_#in~n_BEFORE_CALL_91_90|) (<= 6 |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109_163|) (< .cse5 (+ .cse6 2)) (< (+ |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109| 1) .cse5) (< (+ (* 6 |aux_div_v_mult_#in~n_BEFORE_CALL_91_90|) |c_mult_#res| |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109_163|) .cse3) (<= |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109_163| .cse4) (< |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_91_90_109_163| 0))))) (<= |c_mult_#in~m| 0)) is different from false [2021-11-07 01:59:33,248 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 29 proven. 187 refuted. 0 times theorem prover too weak. 47 trivial. 18 not checked. [2021-11-07 01:59:33,248 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1246824512] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:59:33,248 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2135260509] [2021-11-07 01:59:33,251 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-07 01:59:33,251 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:59:33,252 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-07 01:59:33,252 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:59:33,253 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 22, 34] total 79 [2021-11-07 01:59:33,253 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727480731] [2021-11-07 01:59:33,254 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2021-11-07 01:59:33,254 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:59:33,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-11-07 01:59:33,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=5740, Unknown=1, NotChecked=152, Total=6162 [2021-11-07 01:59:33,256 INFO L87 Difference]: Start difference. First operand 70 states and 97 transitions. Second operand has 79 states, 74 states have (on average 1.527027027027027) internal successors, (113), 52 states have internal predecessors, (113), 21 states have call successors, (21), 1 states have call predecessors, (21), 19 states have return successors, (28), 27 states have call predecessors, (28), 21 states have call successors, (28) [2021-11-07 01:59:35,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:59:35,731 INFO L93 Difference]: Finished difference Result 92 states and 122 transitions. [2021-11-07 01:59:35,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-07 01:59:35,732 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 74 states have (on average 1.527027027027027) internal successors, (113), 52 states have internal predecessors, (113), 21 states have call successors, (21), 1 states have call predecessors, (21), 19 states have return successors, (28), 27 states have call predecessors, (28), 21 states have call successors, (28) Word has length 75 [2021-11-07 01:59:35,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:59:35,733 INFO L225 Difference]: With dead ends: 92 [2021-11-07 01:59:35,733 INFO L226 Difference]: Without dead ends: 85 [2021-11-07 01:59:35,734 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 106 SyntacticMatches, 3 SemanticMatches, 104 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 2219 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=1018, Invalid=9905, Unknown=1, NotChecked=206, Total=11130 [2021-11-07 01:59:35,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-11-07 01:59:35,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 70. [2021-11-07 01:59:35,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 47 states have (on average 1.0851063829787233) internal successors, (51), 48 states have internal predecessors, (51), 9 states have call successors, (9), 4 states have call predecessors, (9), 13 states have return successors, (31), 17 states have call predecessors, (31), 9 states have call successors, (31) [2021-11-07 01:59:35,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 91 transitions. [2021-11-07 01:59:35,746 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 91 transitions. Word has length 75 [2021-11-07 01:59:35,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:59:35,747 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 91 transitions. [2021-11-07 01:59:35,747 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 74 states have (on average 1.527027027027027) internal successors, (113), 52 states have internal predecessors, (113), 21 states have call successors, (21), 1 states have call predecessors, (21), 19 states have return successors, (28), 27 states have call predecessors, (28), 21 states have call successors, (28) [2021-11-07 01:59:35,748 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 91 transitions. [2021-11-07 01:59:35,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-07 01:59:35,749 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:59:35,749 INFO L513 BasicCegarLoop]: trace histogram [11, 11, 11, 9, 9, 9, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:59:35,778 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-07 01:59:35,965 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:59:35,965 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:59:35,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:59:35,965 INFO L85 PathProgramCache]: Analyzing trace with hash -1392852054, now seen corresponding path program 11 times [2021-11-07 01:59:35,965 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:59:35,966 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [320806336] [2021-11-07 01:59:35,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:59:35,966 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:59:35,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:59:37,240 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2021-11-07 01:59:37,240 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:59:37,240 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [320806336] [2021-11-07 01:59:37,240 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [320806336] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:59:37,241 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1803995026] [2021-11-07 01:59:37,241 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 01:59:37,241 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:59:37,241 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:59:37,249 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:59:37,273 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-07 01:59:38,624 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-11-07 01:59:38,624 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:59:38,628 WARN L261 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 132 conjunts are in the unsatisfiable core [2021-11-07 01:59:38,630 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:59:41,070 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 20 proven. 174 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-11-07 01:59:41,070 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:59:48,048 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 33 proven. 259 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-07 01:59:48,048 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1803995026] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 01:59:48,048 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1398816475] [2021-11-07 01:59:48,050 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-07 01:59:48,050 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 01:59:48,051 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-07 01:59:48,052 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 01:59:48,052 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 28, 40] total 90 [2021-11-07 01:59:48,052 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348879740] [2021-11-07 01:59:48,053 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 90 states [2021-11-07 01:59:48,053 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:59:48,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2021-11-07 01:59:48,054 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=375, Invalid=7635, Unknown=0, NotChecked=0, Total=8010 [2021-11-07 01:59:48,055 INFO L87 Difference]: Start difference. First operand 70 states and 91 transitions. Second operand has 90 states, 83 states have (on average 1.5301204819277108) internal successors, (127), 60 states have internal predecessors, (127), 24 states have call successors, (24), 1 states have call predecessors, (24), 20 states have return successors, (32), 30 states have call predecessors, (32), 24 states have call successors, (32) [2021-11-07 01:59:50,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:59:50,903 INFO L93 Difference]: Finished difference Result 95 states and 127 transitions. [2021-11-07 01:59:50,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-07 01:59:50,903 INFO L78 Accepts]: Start accepts. Automaton has has 90 states, 83 states have (on average 1.5301204819277108) internal successors, (127), 60 states have internal predecessors, (127), 24 states have call successors, (24), 1 states have call predecessors, (24), 20 states have return successors, (32), 30 states have call predecessors, (32), 24 states have call successors, (32) Word has length 82 [2021-11-07 01:59:50,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:59:50,905 INFO L225 Difference]: With dead ends: 95 [2021-11-07 01:59:50,905 INFO L226 Difference]: Without dead ends: 88 [2021-11-07 01:59:50,907 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 104 SyntacticMatches, 11 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3148 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=1241, Invalid=12331, Unknown=0, NotChecked=0, Total=13572 [2021-11-07 01:59:50,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-07 01:59:50,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 73. [2021-11-07 01:59:50,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 49 states have (on average 1.0816326530612246) internal successors, (53), 50 states have internal predecessors, (53), 9 states have call successors, (9), 4 states have call predecessors, (9), 14 states have return successors, (34), 18 states have call predecessors, (34), 9 states have call successors, (34) [2021-11-07 01:59:50,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 96 transitions. [2021-11-07 01:59:50,921 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 96 transitions. Word has length 82 [2021-11-07 01:59:50,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:59:50,922 INFO L470 AbstractCegarLoop]: Abstraction has 73 states and 96 transitions. [2021-11-07 01:59:50,922 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 90 states, 83 states have (on average 1.5301204819277108) internal successors, (127), 60 states have internal predecessors, (127), 24 states have call successors, (24), 1 states have call predecessors, (24), 20 states have return successors, (32), 30 states have call predecessors, (32), 24 states have call successors, (32) [2021-11-07 01:59:50,923 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 96 transitions. [2021-11-07 01:59:50,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-07 01:59:50,925 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:59:50,925 INFO L513 BasicCegarLoop]: trace histogram [15, 15, 15, 13, 13, 13, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:59:50,967 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-07 01:59:51,141 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-07 01:59:51,141 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:59:51,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:59:51,141 INFO L85 PathProgramCache]: Analyzing trace with hash -34520552, now seen corresponding path program 12 times [2021-11-07 01:59:51,142 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:59:51,142 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [664412939] [2021-11-07 01:59:51,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:59:51,142 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:59:51,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:59:53,234 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 572 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2021-11-07 01:59:53,235 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:59:53,235 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [664412939] [2021-11-07 01:59:53,235 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [664412939] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:59:53,235 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2047324062] [2021-11-07 01:59:53,235 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 01:59:53,236 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:59:53,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:59:53,238 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:59:53,251 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-07 01:59:54,450 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 01:59:54,450 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 01:59:54,453 WARN L261 TraceCheckSpWp]: Trace formula consists of 336 conjuncts, 181 conjunts are in the unsatisfiable core [2021-11-07 01:59:54,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:59:56,917 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 8 proven. 315 refuted. 0 times theorem prover too weak. 358 trivial. 0 not checked. [2021-11-07 01:59:56,917 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:00:23,956 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [|aux_div_v_mult_#in~n_BEFORE_CALL_132_79|] [2021-11-07 02:00:23,957 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1942445315] [2021-11-07 02:00:23,959 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-07 02:00:23,959 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 02:00:23,960 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-07 02:00:23,974 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-11-07 02:00:23,974 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2021-11-07 02:00:23,974 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1208600989] [2021-11-07 02:00:23,975 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-07 02:00:23,975 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:00:23,976 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-07 02:00:23,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=10342, Unknown=7, NotChecked=0, Total=10712 [2021-11-07 02:00:23,978 INFO L87 Difference]: Start difference. First operand 73 states and 96 transitions. Second operand has 51 states, 48 states have (on average 1.5833333333333333) internal successors, (76), 36 states have internal predecessors, (76), 15 states have call successors, (15), 1 states have call predecessors, (15), 14 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-07 02:00:27,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:00:27,630 INFO L93 Difference]: Finished difference Result 84 states and 113 transitions. [2021-11-07 02:00:27,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-07 02:00:27,631 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 48 states have (on average 1.5833333333333333) internal successors, (76), 36 states have internal predecessors, (76), 15 states have call successors, (15), 1 states have call predecessors, (15), 14 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) Word has length 110 [2021-11-07 02:00:27,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:00:27,632 INFO L225 Difference]: With dead ends: 84 [2021-11-07 02:00:27,632 INFO L226 Difference]: Without dead ends: 80 [2021-11-07 02:00:27,633 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 263 GetRequests, 136 SyntacticMatches, 4 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3014 ImplicationChecksByTransitivity, 26.3s TimeCoverageRelationStatistics Valid=1145, Invalid=14348, Unknown=7, NotChecked=0, Total=15500 [2021-11-07 02:00:27,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2021-11-07 02:00:27,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 76. [2021-11-07 02:00:27,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 52 states have internal predecessors, (55), 9 states have call successors, (9), 4 states have call predecessors, (9), 15 states have return successors, (42), 19 states have call predecessors, (42), 9 states have call successors, (42) [2021-11-07 02:00:27,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 106 transitions. [2021-11-07 02:00:27,651 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 106 transitions. Word has length 110 [2021-11-07 02:00:27,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:00:27,651 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 106 transitions. [2021-11-07 02:00:27,652 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 48 states have (on average 1.5833333333333333) internal successors, (76), 36 states have internal predecessors, (76), 15 states have call successors, (15), 1 states have call predecessors, (15), 14 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-07 02:00:27,652 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 106 transitions. [2021-11-07 02:00:27,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-07 02:00:27,653 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:00:27,654 INFO L513 BasicCegarLoop]: trace histogram [12, 12, 12, 10, 10, 10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:00:27,686 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-07 02:00:27,869 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-07 02:00:27,869 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:00:27,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:00:27,869 INFO L85 PathProgramCache]: Analyzing trace with hash 1149449002, now seen corresponding path program 13 times [2021-11-07 02:00:27,869 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:00:27,869 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1856977995] [2021-11-07 02:00:27,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:00:27,870 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:00:27,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:00:29,177 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 350 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-07 02:00:29,177 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:00:29,177 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1856977995] [2021-11-07 02:00:29,178 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1856977995] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 02:00:29,178 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1571950528] [2021-11-07 02:00:29,178 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 02:00:29,178 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:00:29,178 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:00:29,179 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:00:29,180 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-07 02:00:30,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:00:30,789 WARN L261 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 145 conjunts are in the unsatisfiable core [2021-11-07 02:00:30,791 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:00:32,682 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 8 proven. 201 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2021-11-07 02:00:32,682 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:00:37,928 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 35 proven. 315 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2021-11-07 02:00:37,928 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1571950528] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:00:37,928 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1883004796] [2021-11-07 02:00:37,930 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-07 02:00:37,930 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 02:00:37,930 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-07 02:00:37,931 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 02:00:37,932 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 26, 39] total 92 [2021-11-07 02:00:37,932 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2134971181] [2021-11-07 02:00:37,933 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2021-11-07 02:00:37,933 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:00:37,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2021-11-07 02:00:37,934 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=315, Invalid=8057, Unknown=0, NotChecked=0, Total=8372 [2021-11-07 02:00:37,934 INFO L87 Difference]: Start difference. First operand 76 states and 106 transitions. Second operand has 92 states, 87 states have (on average 1.528735632183908) internal successors, (133), 59 states have internal predecessors, (133), 25 states have call successors, (25), 1 states have call predecessors, (25), 22 states have return successors, (34), 33 states have call predecessors, (34), 25 states have call successors, (34) [2021-11-07 02:00:41,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:00:41,239 INFO L93 Difference]: Finished difference Result 98 states and 131 transitions. [2021-11-07 02:00:41,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-07 02:00:41,239 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 87 states have (on average 1.528735632183908) internal successors, (133), 59 states have internal predecessors, (133), 25 states have call successors, (25), 1 states have call predecessors, (25), 22 states have return successors, (34), 33 states have call predecessors, (34), 25 states have call successors, (34) Word has length 89 [2021-11-07 02:00:41,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:00:41,240 INFO L225 Difference]: With dead ends: 98 [2021-11-07 02:00:41,240 INFO L226 Difference]: Without dead ends: 91 [2021-11-07 02:00:41,242 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 126 SyntacticMatches, 4 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3120 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=1306, Invalid=13700, Unknown=0, NotChecked=0, Total=15006 [2021-11-07 02:00:41,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-11-07 02:00:41,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 76. [2021-11-07 02:00:41,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 52 states have internal predecessors, (55), 9 states have call successors, (9), 4 states have call predecessors, (9), 15 states have return successors, (37), 19 states have call predecessors, (37), 9 states have call successors, (37) [2021-11-07 02:00:41,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 101 transitions. [2021-11-07 02:00:41,252 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 101 transitions. Word has length 89 [2021-11-07 02:00:41,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:00:41,253 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 101 transitions. [2021-11-07 02:00:41,253 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 92 states, 87 states have (on average 1.528735632183908) internal successors, (133), 59 states have internal predecessors, (133), 25 states have call successors, (25), 1 states have call predecessors, (25), 22 states have return successors, (34), 33 states have call predecessors, (34), 25 states have call successors, (34) [2021-11-07 02:00:41,253 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 101 transitions. [2021-11-07 02:00:41,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-07 02:00:41,255 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:00:41,255 INFO L513 BasicCegarLoop]: trace histogram [13, 13, 13, 11, 11, 11, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:00:41,285 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-07 02:00:41,465 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:00:41,465 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:00:41,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:00:41,465 INFO L85 PathProgramCache]: Analyzing trace with hash -545950054, now seen corresponding path program 14 times [2021-11-07 02:00:41,465 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:00:41,465 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [154269895] [2021-11-07 02:00:41,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:00:41,466 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:00:41,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:00:42,905 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 0 proven. 418 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2021-11-07 02:00:42,905 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:00:42,905 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [154269895] [2021-11-07 02:00:42,905 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [154269895] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 02:00:42,905 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1109106753] [2021-11-07 02:00:42,905 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 02:00:42,905 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:00:42,906 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:00:42,907 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:00:42,908 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-07 02:00:44,603 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-11-07 02:00:44,604 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:00:44,608 WARN L261 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 157 conjunts are in the unsatisfiable core [2021-11-07 02:00:44,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:00:46,524 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 5 proven. 233 refuted. 0 times theorem prover too weak. 262 trivial. 0 not checked. [2021-11-07 02:00:46,524 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:01:09,772 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [|aux_div_v_mult_#in~n_BEFORE_CALL_171_61|] [2021-11-07 02:01:09,773 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1986519999] [2021-11-07 02:01:09,774 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-07 02:01:09,775 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 02:01:09,775 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-07 02:01:09,776 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-11-07 02:01:09,776 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2021-11-07 02:01:09,777 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038657804] [2021-11-07 02:01:09,777 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-07 02:01:09,777 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:01:09,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-07 02:01:09,778 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=307, Invalid=7341, Unknown=8, NotChecked=0, Total=7656 [2021-11-07 02:01:09,779 INFO L87 Difference]: Start difference. First operand 76 states and 101 transitions. Second operand has 45 states, 42 states have (on average 1.5714285714285714) internal successors, (66), 32 states have internal predecessors, (66), 13 states have call successors, (13), 1 states have call predecessors, (13), 12 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-11-07 02:01:12,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:01:12,303 INFO L93 Difference]: Finished difference Result 86 states and 111 transitions. [2021-11-07 02:01:12,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-07 02:01:12,303 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 42 states have (on average 1.5714285714285714) internal successors, (66), 32 states have internal predecessors, (66), 13 states have call successors, (13), 1 states have call predecessors, (13), 12 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) Word has length 96 [2021-11-07 02:01:12,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:01:12,305 INFO L225 Difference]: With dead ends: 86 [2021-11-07 02:01:12,305 INFO L226 Difference]: Without dead ends: 82 [2021-11-07 02:01:12,307 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 111 SyntacticMatches, 4 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1993 ImplicationChecksByTransitivity, 22.8s TimeCoverageRelationStatistics Valid=860, Invalid=10052, Unknown=8, NotChecked=0, Total=10920 [2021-11-07 02:01:12,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-11-07 02:01:12,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 76. [2021-11-07 02:01:12,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 52 states have internal predecessors, (55), 9 states have call successors, (9), 4 states have call predecessors, (9), 15 states have return successors, (37), 19 states have call predecessors, (37), 9 states have call successors, (37) [2021-11-07 02:01:12,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 101 transitions. [2021-11-07 02:01:12,319 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 101 transitions. Word has length 96 [2021-11-07 02:01:12,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:01:12,320 INFO L470 AbstractCegarLoop]: Abstraction has 76 states and 101 transitions. [2021-11-07 02:01:12,320 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 42 states have (on average 1.5714285714285714) internal successors, (66), 32 states have internal predecessors, (66), 13 states have call successors, (13), 1 states have call predecessors, (13), 12 states have return successors, (13), 13 states have call predecessors, (13), 13 states have call successors, (13) [2021-11-07 02:01:12,320 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 101 transitions. [2021-11-07 02:01:12,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-07 02:01:12,323 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:01:12,323 INFO L513 BasicCegarLoop]: trace histogram [13, 13, 13, 11, 11, 11, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:01:12,380 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-07 02:01:12,545 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-07 02:01:12,545 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:01:12,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:01:12,546 INFO L85 PathProgramCache]: Analyzing trace with hash -2050033702, now seen corresponding path program 15 times [2021-11-07 02:01:12,546 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:01:12,546 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249692031] [2021-11-07 02:01:12,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:01:12,546 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:01:12,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:01:14,236 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 0 proven. 418 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2021-11-07 02:01:14,236 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:01:14,236 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249692031] [2021-11-07 02:01:14,236 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [249692031] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 02:01:14,236 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1784475819] [2021-11-07 02:01:14,236 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 02:01:14,236 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:01:14,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:01:14,237 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:01:14,238 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-07 02:01:16,078 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 02:01:16,079 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:01:16,082 WARN L261 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 157 conjunts are in the unsatisfiable core [2021-11-07 02:01:16,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:01:18,164 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 9 proven. 238 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-07 02:01:18,164 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:01:24,360 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 38 proven. 380 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2021-11-07 02:01:24,361 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1784475819] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:01:24,361 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1561925908] [2021-11-07 02:01:24,363 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-07 02:01:24,363 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 02:01:24,363 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-07 02:01:24,364 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 02:01:24,364 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 28, 42] total 99 [2021-11-07 02:01:24,364 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506005328] [2021-11-07 02:01:24,365 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 99 states [2021-11-07 02:01:24,366 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:01:24,366 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2021-11-07 02:01:24,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=339, Invalid=9363, Unknown=0, NotChecked=0, Total=9702 [2021-11-07 02:01:24,368 INFO L87 Difference]: Start difference. First operand 76 states and 101 transitions. Second operand has 99 states, 94 states have (on average 1.5319148936170213) internal successors, (144), 63 states have internal predecessors, (144), 27 states have call successors, (27), 1 states have call predecessors, (27), 24 states have return successors, (37), 36 states have call predecessors, (37), 27 states have call successors, (37) [2021-11-07 02:01:28,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:01:28,351 INFO L93 Difference]: Finished difference Result 101 states and 137 transitions. [2021-11-07 02:01:28,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-07 02:01:28,351 INFO L78 Accepts]: Start accepts. Automaton has has 99 states, 94 states have (on average 1.5319148936170213) internal successors, (144), 63 states have internal predecessors, (144), 27 states have call successors, (27), 1 states have call predecessors, (27), 24 states have return successors, (37), 36 states have call predecessors, (37), 27 states have call successors, (37) Word has length 96 [2021-11-07 02:01:28,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:01:28,352 INFO L225 Difference]: With dead ends: 101 [2021-11-07 02:01:28,352 INFO L226 Difference]: Without dead ends: 94 [2021-11-07 02:01:28,354 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 270 GetRequests, 136 SyntacticMatches, 4 SemanticMatches, 130 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3597 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=1463, Invalid=15829, Unknown=0, NotChecked=0, Total=17292 [2021-11-07 02:01:28,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-11-07 02:01:28,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 79. [2021-11-07 02:01:28,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 53 states have (on average 1.0754716981132075) internal successors, (57), 54 states have internal predecessors, (57), 9 states have call successors, (9), 4 states have call predecessors, (9), 16 states have return successors, (40), 20 states have call predecessors, (40), 9 states have call successors, (40) [2021-11-07 02:01:28,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 106 transitions. [2021-11-07 02:01:28,364 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 106 transitions. Word has length 96 [2021-11-07 02:01:28,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:01:28,365 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 106 transitions. [2021-11-07 02:01:28,365 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 99 states, 94 states have (on average 1.5319148936170213) internal successors, (144), 63 states have internal predecessors, (144), 27 states have call successors, (27), 1 states have call predecessors, (27), 24 states have return successors, (37), 36 states have call predecessors, (37), 27 states have call successors, (37) [2021-11-07 02:01:28,365 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 106 transitions. [2021-11-07 02:01:28,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-07 02:01:28,367 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:01:28,367 INFO L513 BasicCegarLoop]: trace histogram [14, 14, 14, 12, 12, 12, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:01:28,397 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2021-11-07 02:01:28,581 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-07 02:01:28,581 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:01:28,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:01:28,581 INFO L85 PathProgramCache]: Analyzing trace with hash -772884420, now seen corresponding path program 16 times [2021-11-07 02:01:28,582 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:01:28,582 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1704666296] [2021-11-07 02:01:28,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:01:28,582 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:01:28,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:01:30,352 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 0 proven. 492 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-11-07 02:01:30,352 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:01:30,353 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1704666296] [2021-11-07 02:01:30,353 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1704666296] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 02:01:30,353 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [672007428] [2021-11-07 02:01:30,353 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 02:01:30,353 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:01:30,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:01:30,354 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:01:30,354 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-07 02:01:32,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:01:32,539 WARN L261 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 169 conjunts are in the unsatisfiable core [2021-11-07 02:01:32,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:01:34,636 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 5 proven. 274 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2021-11-07 02:01:34,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:02:02,714 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [|aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_213_67_142_143|, |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_213_67_142_143|, |aux_div_v_mult_#in~n_BEFORE_CALL_213_67|] [2021-11-07 02:02:02,714 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [504276311] [2021-11-07 02:02:02,715 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-07 02:02:02,715 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 02:02:02,715 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-07 02:02:02,716 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-11-07 02:02:02,716 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2021-11-07 02:02:02,716 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021480519] [2021-11-07 02:02:02,716 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-07 02:02:02,716 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:02:02,717 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-07 02:02:02,717 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=322, Invalid=8228, Unknown=6, NotChecked=0, Total=8556 [2021-11-07 02:02:02,718 INFO L87 Difference]: Start difference. First operand 79 states and 106 transitions. Second operand has 48 states, 45 states have (on average 1.5777777777777777) internal successors, (71), 34 states have internal predecessors, (71), 14 states have call successors, (14), 1 states have call predecessors, (14), 13 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-11-07 02:02:05,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:02:05,981 INFO L93 Difference]: Finished difference Result 89 states and 116 transitions. [2021-11-07 02:02:05,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-07 02:02:05,982 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 45 states have (on average 1.5777777777777777) internal successors, (71), 34 states have internal predecessors, (71), 14 states have call successors, (14), 1 states have call predecessors, (14), 13 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) Word has length 103 [2021-11-07 02:02:05,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:02:05,983 INFO L225 Difference]: With dead ends: 89 [2021-11-07 02:02:05,983 INFO L226 Difference]: Without dead ends: 85 [2021-11-07 02:02:05,985 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 115 SyntacticMatches, 5 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2282 ImplicationChecksByTransitivity, 27.5s TimeCoverageRelationStatistics Valid=960, Invalid=11466, Unknown=6, NotChecked=0, Total=12432 [2021-11-07 02:02:05,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-11-07 02:02:05,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 79. [2021-11-07 02:02:05,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 53 states have (on average 1.0754716981132075) internal successors, (57), 54 states have internal predecessors, (57), 9 states have call successors, (9), 4 states have call predecessors, (9), 16 states have return successors, (40), 20 states have call predecessors, (40), 9 states have call successors, (40) [2021-11-07 02:02:05,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 106 transitions. [2021-11-07 02:02:05,994 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 106 transitions. Word has length 103 [2021-11-07 02:02:05,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:02:05,995 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 106 transitions. [2021-11-07 02:02:05,995 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 45 states have (on average 1.5777777777777777) internal successors, (71), 34 states have internal predecessors, (71), 14 states have call successors, (14), 1 states have call predecessors, (14), 13 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-11-07 02:02:05,995 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 106 transitions. [2021-11-07 02:02:05,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-07 02:02:05,997 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:02:05,997 INFO L513 BasicCegarLoop]: trace histogram [14, 14, 14, 12, 12, 12, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:02:06,031 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-07 02:02:06,213 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:02:06,213 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:02:06,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:02:06,213 INFO L85 PathProgramCache]: Analyzing trace with hash 1109932794, now seen corresponding path program 17 times [2021-11-07 02:02:06,213 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:02:06,213 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [661393930] [2021-11-07 02:02:06,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:02:06,214 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:02:06,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:02:07,755 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 0 proven. 492 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-11-07 02:02:07,755 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:02:07,755 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [661393930] [2021-11-07 02:02:07,755 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [661393930] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 02:02:07,756 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [880857782] [2021-11-07 02:02:07,756 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 02:02:07,756 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:02:07,756 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:02:07,756 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:02:07,758 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-07 02:02:09,909 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-07 02:02:09,910 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:02:09,913 WARN L261 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 169 conjunts are in the unsatisfiable core [2021-11-07 02:02:09,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:02:12,597 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 10 proven. 278 refuted. 0 times theorem prover too weak. 299 trivial. 0 not checked. [2021-11-07 02:02:12,597 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:02:21,123 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 41 proven. 451 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2021-11-07 02:02:21,123 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [880857782] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:02:21,123 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [105631015] [2021-11-07 02:02:21,125 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-07 02:02:21,125 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 02:02:21,125 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-07 02:02:21,126 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 02:02:21,126 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 30, 45] total 106 [2021-11-07 02:02:21,126 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1849390032] [2021-11-07 02:02:21,126 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2021-11-07 02:02:21,127 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:02:21,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2021-11-07 02:02:21,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=10767, Unknown=0, NotChecked=0, Total=11130 [2021-11-07 02:02:21,128 INFO L87 Difference]: Start difference. First operand 79 states and 106 transitions. Second operand has 106 states, 101 states have (on average 1.5346534653465347) internal successors, (155), 67 states have internal predecessors, (155), 29 states have call successors, (29), 1 states have call predecessors, (29), 26 states have return successors, (40), 39 states have call predecessors, (40), 29 states have call successors, (40) [2021-11-07 02:02:25,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:02:25,014 INFO L93 Difference]: Finished difference Result 104 states and 142 transitions. [2021-11-07 02:02:25,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-07 02:02:25,014 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 101 states have (on average 1.5346534653465347) internal successors, (155), 67 states have internal predecessors, (155), 29 states have call successors, (29), 1 states have call predecessors, (29), 26 states have return successors, (40), 39 states have call predecessors, (40), 29 states have call successors, (40) Word has length 103 [2021-11-07 02:02:25,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:02:25,016 INFO L225 Difference]: With dead ends: 104 [2021-11-07 02:02:25,016 INFO L226 Difference]: Without dead ends: 97 [2021-11-07 02:02:25,019 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 146 SyntacticMatches, 4 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4109 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=1628, Invalid=18112, Unknown=0, NotChecked=0, Total=19740 [2021-11-07 02:02:25,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-11-07 02:02:25,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 82. [2021-11-07 02:02:25,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 55 states have (on average 1.0727272727272728) internal successors, (59), 56 states have internal predecessors, (59), 9 states have call successors, (9), 4 states have call predecessors, (9), 17 states have return successors, (43), 21 states have call predecessors, (43), 9 states have call successors, (43) [2021-11-07 02:02:25,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 111 transitions. [2021-11-07 02:02:25,032 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 111 transitions. Word has length 103 [2021-11-07 02:02:25,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:02:25,033 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 111 transitions. [2021-11-07 02:02:25,033 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 106 states, 101 states have (on average 1.5346534653465347) internal successors, (155), 67 states have internal predecessors, (155), 29 states have call successors, (29), 1 states have call predecessors, (29), 26 states have return successors, (40), 39 states have call predecessors, (40), 29 states have call successors, (40) [2021-11-07 02:02:25,033 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 111 transitions. [2021-11-07 02:02:25,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-07 02:02:25,035 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:02:25,035 INFO L513 BasicCegarLoop]: trace histogram [15, 15, 15, 13, 13, 13, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:02:25,081 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-07 02:02:25,259 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:02:25,259 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:02:25,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:02:25,260 INFO L85 PathProgramCache]: Analyzing trace with hash 1650246186, now seen corresponding path program 18 times [2021-11-07 02:02:25,260 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:02:25,260 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1406335966] [2021-11-07 02:02:25,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:02:25,260 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:02:25,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:02:27,367 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 572 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2021-11-07 02:02:27,368 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:02:27,368 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1406335966] [2021-11-07 02:02:27,368 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1406335966] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 02:02:27,369 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [35785340] [2021-11-07 02:02:27,369 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 02:02:27,369 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:02:27,369 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:02:27,370 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:02:27,372 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-07 02:02:29,817 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 02:02:29,818 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:02:29,821 WARN L261 TraceCheckSpWp]: Trace formula consists of 336 conjuncts, 181 conjunts are in the unsatisfiable core [2021-11-07 02:02:29,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:02:32,509 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 5 proven. 318 refuted. 0 times theorem prover too weak. 358 trivial. 0 not checked. [2021-11-07 02:02:32,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:02:57,336 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [|aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_258_101_154_145|, |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_258_101_154_145|, |aux_div_v_mult_#in~n_BEFORE_CALL_258_101|] [2021-11-07 02:02:57,337 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1218541142] [2021-11-07 02:02:57,339 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-07 02:02:57,339 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 02:02:57,340 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-07 02:02:57,341 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-11-07 02:02:57,341 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2021-11-07 02:02:57,341 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623639321] [2021-11-07 02:02:57,343 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-07 02:02:57,343 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:02:57,343 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-07 02:02:57,344 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=9161, Unknown=8, NotChecked=0, Total=9506 [2021-11-07 02:02:57,345 INFO L87 Difference]: Start difference. First operand 82 states and 111 transitions. Second operand has 51 states, 48 states have (on average 1.5833333333333333) internal successors, (76), 36 states have internal predecessors, (76), 15 states have call successors, (15), 1 states have call predecessors, (15), 14 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-07 02:03:00,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:03:00,832 INFO L93 Difference]: Finished difference Result 92 states and 121 transitions. [2021-11-07 02:03:00,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-07 02:03:00,832 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 48 states have (on average 1.5833333333333333) internal successors, (76), 36 states have internal predecessors, (76), 15 states have call successors, (15), 1 states have call predecessors, (15), 14 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) Word has length 110 [2021-11-07 02:03:00,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:03:00,834 INFO L225 Difference]: With dead ends: 92 [2021-11-07 02:03:00,834 INFO L226 Difference]: Without dead ends: 88 [2021-11-07 02:03:00,836 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 121 SyntacticMatches, 4 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2485 ImplicationChecksByTransitivity, 25.9s TimeCoverageRelationStatistics Valid=1064, Invalid=12970, Unknown=8, NotChecked=0, Total=14042 [2021-11-07 02:03:00,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-07 02:03:00,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 82. [2021-11-07 02:03:00,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 55 states have (on average 1.0727272727272728) internal successors, (59), 56 states have internal predecessors, (59), 9 states have call successors, (9), 4 states have call predecessors, (9), 17 states have return successors, (43), 21 states have call predecessors, (43), 9 states have call successors, (43) [2021-11-07 02:03:00,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 111 transitions. [2021-11-07 02:03:00,850 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 111 transitions. Word has length 110 [2021-11-07 02:03:00,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:03:00,850 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 111 transitions. [2021-11-07 02:03:00,851 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 48 states have (on average 1.5833333333333333) internal successors, (76), 36 states have internal predecessors, (76), 15 states have call successors, (15), 1 states have call predecessors, (15), 14 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-07 02:03:00,851 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 111 transitions. [2021-11-07 02:03:00,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2021-11-07 02:03:00,852 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:03:00,853 INFO L513 BasicCegarLoop]: trace histogram [15, 15, 15, 13, 13, 13, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:03:00,886 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-07 02:03:01,057 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-07 02:03:01,057 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:03:01,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:03:01,058 INFO L85 PathProgramCache]: Analyzing trace with hash 209449994, now seen corresponding path program 19 times [2021-11-07 02:03:01,058 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:03:01,058 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1939980495] [2021-11-07 02:03:01,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:03:01,058 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:03:01,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:03:03,480 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 572 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2021-11-07 02:03:03,480 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:03:03,481 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1939980495] [2021-11-07 02:03:03,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1939980495] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 02:03:03,481 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [51970917] [2021-11-07 02:03:03,481 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 02:03:03,481 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:03:03,481 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:03:03,482 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:03:03,484 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-07 02:03:06,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:03:06,081 WARN L261 TraceCheckSpWp]: Trace formula consists of 336 conjuncts, 181 conjunts are in the unsatisfiable core [2021-11-07 02:03:06,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:03:09,038 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 11 proven. 321 refuted. 0 times theorem prover too weak. 349 trivial. 0 not checked. [2021-11-07 02:03:09,038 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:03:19,789 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((|aux_div_v_mult_#in~n_BEFORE_CALL_285_81| Int) (|aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| Int) (|aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133| Int) (|aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| Int) (v_mult_~n_BEFORE_CALL_285 Int)) (let ((.cse4 (* 11 |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137|))) (let ((.cse3 (* 11 |aux_div_v_mult_#in~n_BEFORE_CALL_285_81|)) (.cse2 (+ |c_mult_#res| |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| .cse4)) (.cse0 (div (+ (- 1) (* |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| (- 2)) (* v_mult_~n_BEFORE_CALL_285 2) (* |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| (- 22))) (- 11))) (.cse1 (div (+ (* |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| 22) (- 1) (* |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| 2) (* v_mult_~n_BEFORE_CALL_285 (- 2))) 11))) (or (< .cse0 (+ 2 .cse1)) (< .cse2 .cse3) (<= .cse0 (+ |aux_div_v_mult_#in~n_BEFORE_CALL_285_81| 1)) (< |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| 0) (< (* 11 |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133|) (+ |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| .cse4)) (<= (+ .cse3 11) .cse2) (< (+ 1 |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137|) .cse0) (< (+ .cse1 1) |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133|))))) (<= 0 |c_mult_#in~m|) (forall ((|aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| Int) (|aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| Int) (|aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125| Int) (|aux_div_v_mult_#in~n_BEFORE_CALL_285_115| Int) (v_mult_~n_BEFORE_CALL_285 Int)) (let ((.cse10 (div (+ (- 1) (* |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| 22) (* v_mult_~n_BEFORE_CALL_285 (- 2)) (* |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| 2)) 11))) (let ((.cse5 (* 11 |aux_div_v_mult_#in~n_BEFORE_CALL_285_115|)) (.cse7 (div (+ (- 1) (* |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| (- 22)) (* |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| (- 2)) (* v_mult_~n_BEFORE_CALL_285 2)) (- 11))) (.cse8 (+ .cse10 1)) (.cse6 (* 11 |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139|)) (.cse9 (* 11 |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125|))) (or (< .cse5 (+ |c_mult_#res| .cse6 |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139|)) (<= 11 |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139|) (< (+ |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| 1) .cse7) (<= (+ |c_mult_#res| .cse6 |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| 11) .cse5) (< .cse8 |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125|) (< .cse9 (+ .cse6 |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139|)) (< .cse7 (+ 2 .cse10)) (< |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| 0) (<= |aux_div_v_mult_#in~n_BEFORE_CALL_285_115| .cse8) (<= (+ .cse6 |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| 11) .cse9))))) (<= |c_mult_#in~m| 0)) is different from false [2021-11-07 02:03:22,130 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((|aux_div_v_mult_#in~n_BEFORE_CALL_285_81| Int) (|aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| Int) (|aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133| Int) (|aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| Int) (v_mult_~n_BEFORE_CALL_285 Int)) (let ((.cse4 (* 11 |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137|))) (let ((.cse3 (* 11 |aux_div_v_mult_#in~n_BEFORE_CALL_285_81|)) (.cse2 (+ |c_mult_#res| |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| .cse4)) (.cse0 (div (+ (- 1) (* |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| (- 2)) (* v_mult_~n_BEFORE_CALL_285 2) (* |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| (- 22))) (- 11))) (.cse1 (div (+ (* |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| 22) (- 1) (* |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| 2) (* v_mult_~n_BEFORE_CALL_285 (- 2))) 11))) (or (< .cse0 (+ 2 .cse1)) (< .cse2 .cse3) (<= .cse0 (+ |aux_div_v_mult_#in~n_BEFORE_CALL_285_81| 1)) (< |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| 0) (< (* 11 |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133|) (+ |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137| .cse4)) (<= (+ .cse3 11) .cse2) (< (+ 1 |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133_137|) .cse0) (< (+ .cse1 1) |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_285_81_133|))))) (forall ((|aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| Int) (|aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| Int) (|aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125| Int) (|aux_div_v_mult_#in~n_BEFORE_CALL_285_115| Int) (v_mult_~n_BEFORE_CALL_285 Int)) (let ((.cse9 (div (+ (- 1) (* |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| 22) (* v_mult_~n_BEFORE_CALL_285 (- 2)) (* |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| 2)) 11))) (let ((.cse5 (* 11 |aux_div_v_mult_#in~n_BEFORE_CALL_285_115|)) (.cse6 (* 11 |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139|)) (.cse7 (div (+ (- 1) (* |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| (- 22)) (* |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| (- 2)) (* v_mult_~n_BEFORE_CALL_285 2)) (- 11))) (.cse8 (+ .cse9 1))) (or (< .cse5 (+ |c_mult_#res| .cse6 |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139|)) (< (+ |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| 1) .cse7) (<= (+ |c_mult_#res| .cse6 |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| 11) .cse5) (< .cse8 |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125|) (< (* 11 |aux_div_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125|) (+ .cse6 |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139|)) (< .cse7 (+ 2 .cse9)) (< |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_285_115_125_139| 0) (<= |aux_div_v_mult_#in~n_BEFORE_CALL_285_115| .cse8))))) (<= 0 |c_mult_#in~m|) (<= |c_mult_#in~m| 0)) is different from false [2021-11-07 02:03:22,352 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 44 proven. 502 refuted. 0 times theorem prover too weak. 107 trivial. 28 not checked. [2021-11-07 02:03:22,353 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [51970917] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:03:22,353 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2091950568] [2021-11-07 02:03:22,354 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-07 02:03:22,354 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 02:03:22,354 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-07 02:03:22,355 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2021-11-07 02:03:22,356 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 32, 50] total 115 [2021-11-07 02:03:22,356 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268904973] [2021-11-07 02:03:22,357 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 115 states [2021-11-07 02:03:22,357 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:03:22,357 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2021-11-07 02:03:22,358 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=391, Invalid=12271, Unknown=2, NotChecked=446, Total=13110 [2021-11-07 02:03:22,359 INFO L87 Difference]: Start difference. First operand 82 states and 111 transitions. Second operand has 115 states, 109 states have (on average 1.5412844036697249) internal successors, (168), 73 states have internal predecessors, (168), 31 states have call successors, (31), 1 states have call predecessors, (31), 29 states have return successors, (43), 42 states have call predecessors, (43), 31 states have call successors, (43) [2021-11-07 02:03:26,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:03:26,919 INFO L93 Difference]: Finished difference Result 107 states and 147 transitions. [2021-11-07 02:03:26,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-07 02:03:26,920 INFO L78 Accepts]: Start accepts. Automaton has has 115 states, 109 states have (on average 1.5412844036697249) internal successors, (168), 73 states have internal predecessors, (168), 31 states have call successors, (31), 1 states have call predecessors, (31), 29 states have return successors, (43), 42 states have call predecessors, (43), 31 states have call successors, (43) Word has length 110 [2021-11-07 02:03:26,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:03:26,922 INFO L225 Difference]: With dead ends: 107 [2021-11-07 02:03:26,922 INFO L226 Difference]: Without dead ends: 100 [2021-11-07 02:03:26,924 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 309 GetRequests, 155 SyntacticMatches, 4 SemanticMatches, 150 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 4627 ImplicationChecksByTransitivity, 13.6s TimeCoverageRelationStatistics Valid=1805, Invalid=20551, Unknown=2, NotChecked=594, Total=22952 [2021-11-07 02:03:26,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-11-07 02:03:26,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 85. [2021-11-07 02:03:26,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 57 states have (on average 1.0701754385964912) internal successors, (61), 58 states have internal predecessors, (61), 9 states have call successors, (9), 4 states have call predecessors, (9), 18 states have return successors, (46), 22 states have call predecessors, (46), 9 states have call successors, (46) [2021-11-07 02:03:26,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 116 transitions. [2021-11-07 02:03:26,935 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 116 transitions. Word has length 110 [2021-11-07 02:03:26,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:03:26,936 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 116 transitions. [2021-11-07 02:03:26,936 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 115 states, 109 states have (on average 1.5412844036697249) internal successors, (168), 73 states have internal predecessors, (168), 31 states have call successors, (31), 1 states have call predecessors, (31), 29 states have return successors, (43), 42 states have call predecessors, (43), 31 states have call successors, (43) [2021-11-07 02:03:26,937 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 116 transitions. [2021-11-07 02:03:26,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-07 02:03:26,938 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:03:26,938 INFO L513 BasicCegarLoop]: trace histogram [16, 16, 16, 14, 14, 14, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:03:26,975 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-07 02:03:27,153 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-07 02:03:27,153 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:03:27,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:03:27,153 INFO L85 PathProgramCache]: Analyzing trace with hash -736446292, now seen corresponding path program 20 times [2021-11-07 02:03:27,154 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:03:27,154 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [377047407] [2021-11-07 02:03:27,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:03:27,154 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:03:27,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:03:29,538 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 0 proven. 658 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2021-11-07 02:03:29,539 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:03:29,539 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [377047407] [2021-11-07 02:03:29,539 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [377047407] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 02:03:29,539 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [692502285] [2021-11-07 02:03:29,539 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 02:03:29,539 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:03:29,539 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:03:29,545 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:03:29,563 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-07 02:03:32,444 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2021-11-07 02:03:32,444 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:03:32,448 WARN L261 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 193 conjunts are in the unsatisfiable core [2021-11-07 02:03:32,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:03:35,137 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 5 proven. 366 refuted. 0 times theorem prover too weak. 411 trivial. 0 not checked. [2021-11-07 02:03:35,138 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:04:08,172 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [|aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_306_101_146_137|, |aux_div_v_mult_#in~n_BEFORE_CALL_306_101|, |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_306_101_146_137|] [2021-11-07 02:04:08,172 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1832979782] [2021-11-07 02:04:08,174 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-07 02:04:08,174 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 02:04:08,175 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-07 02:04:08,176 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-11-07 02:04:08,176 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54] total 54 [2021-11-07 02:04:08,177 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760299259] [2021-11-07 02:04:08,177 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2021-11-07 02:04:08,177 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:04:08,178 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-11-07 02:04:08,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=347, Invalid=9947, Unknown=8, NotChecked=0, Total=10302 [2021-11-07 02:04:08,179 INFO L87 Difference]: Start difference. First operand 85 states and 116 transitions. Second operand has 54 states, 51 states have (on average 1.588235294117647) internal successors, (81), 38 states have internal predecessors, (81), 16 states have call successors, (16), 1 states have call predecessors, (16), 15 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-11-07 02:04:12,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:04:12,721 INFO L93 Difference]: Finished difference Result 95 states and 126 transitions. [2021-11-07 02:04:12,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-07 02:04:12,722 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 51 states have (on average 1.588235294117647) internal successors, (81), 38 states have internal predecessors, (81), 16 states have call successors, (16), 1 states have call predecessors, (16), 15 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) Word has length 117 [2021-11-07 02:04:12,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:04:12,723 INFO L225 Difference]: With dead ends: 95 [2021-11-07 02:04:12,723 INFO L226 Difference]: Without dead ends: 91 [2021-11-07 02:04:12,725 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 120 SyntacticMatches, 11 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2963 ImplicationChecksByTransitivity, 34.4s TimeCoverageRelationStatistics Valid=1148, Invalid=14344, Unknown=8, NotChecked=0, Total=15500 [2021-11-07 02:04:12,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-11-07 02:04:12,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 85. [2021-11-07 02:04:12,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 57 states have (on average 1.0701754385964912) internal successors, (61), 58 states have internal predecessors, (61), 9 states have call successors, (9), 4 states have call predecessors, (9), 18 states have return successors, (46), 22 states have call predecessors, (46), 9 states have call successors, (46) [2021-11-07 02:04:12,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 116 transitions. [2021-11-07 02:04:12,737 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 116 transitions. Word has length 117 [2021-11-07 02:04:12,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:04:12,737 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 116 transitions. [2021-11-07 02:04:12,737 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 51 states have (on average 1.588235294117647) internal successors, (81), 38 states have internal predecessors, (81), 16 states have call successors, (16), 1 states have call predecessors, (16), 15 states have return successors, (16), 16 states have call predecessors, (16), 16 states have call successors, (16) [2021-11-07 02:04:12,738 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 116 transitions. [2021-11-07 02:04:12,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2021-11-07 02:04:12,739 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:04:12,739 INFO L513 BasicCegarLoop]: trace histogram [19, 19, 19, 17, 17, 17, 17, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:04:12,781 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-07 02:04:12,957 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-07 02:04:12,957 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:04:12,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:04:12,957 INFO L85 PathProgramCache]: Analyzing trace with hash -1578010440, now seen corresponding path program 21 times [2021-11-07 02:04:12,957 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:04:12,957 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [976132723] [2021-11-07 02:04:12,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:04:12,958 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:04:13,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:04:15,658 INFO L134 CoverageAnalysis]: Checked inductivity of 1127 backedges. 0 proven. 952 refuted. 0 times theorem prover too weak. 175 trivial. 0 not checked. [2021-11-07 02:04:15,658 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:04:15,658 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [976132723] [2021-11-07 02:04:15,658 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [976132723] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 02:04:15,658 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [118173378] [2021-11-07 02:04:15,658 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 02:04:15,658 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:04:15,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:04:15,659 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:04:15,661 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-07 02:04:18,608 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 02:04:18,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:04:18,612 WARN L261 TraceCheckSpWp]: Trace formula consists of 412 conjuncts, 229 conjunts are in the unsatisfiable core [2021-11-07 02:04:18,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:04:22,064 INFO L134 CoverageAnalysis]: Checked inductivity of 1127 backedges. 12 proven. 517 refuted. 0 times theorem prover too weak. 598 trivial. 0 not checked. [2021-11-07 02:04:22,064 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:04:51,167 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [|aux_div_v_mult_#in~n_BEFORE_CALL_338_68|, |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_338_68_144_145|, |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_338_68_144_145|] [2021-11-07 02:04:51,167 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1844914053] [2021-11-07 02:04:51,169 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-07 02:04:51,169 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 02:04:51,169 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-07 02:04:51,169 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-11-07 02:04:51,169 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63] total 63 [2021-11-07 02:04:51,169 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443351542] [2021-11-07 02:04:51,170 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-07 02:04:51,170 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:04:51,170 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-07 02:04:51,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=459, Invalid=16826, Unknown=7, NotChecked=0, Total=17292 [2021-11-07 02:04:51,171 INFO L87 Difference]: Start difference. First operand 85 states and 116 transitions. Second operand has 63 states, 60 states have (on average 1.6) internal successors, (96), 44 states have internal predecessors, (96), 19 states have call successors, (19), 1 states have call predecessors, (19), 18 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-07 02:04:57,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:04:57,782 INFO L93 Difference]: Finished difference Result 98 states and 137 transitions. [2021-11-07 02:04:57,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-07 02:04:57,783 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 60 states have (on average 1.6) internal successors, (96), 44 states have internal predecessors, (96), 19 states have call successors, (19), 1 states have call predecessors, (19), 18 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) Word has length 138 [2021-11-07 02:04:57,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:04:57,785 INFO L225 Difference]: With dead ends: 98 [2021-11-07 02:04:57,785 INFO L226 Difference]: Without dead ends: 94 [2021-11-07 02:04:57,787 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 176 SyntacticMatches, 4 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5206 ImplicationChecksByTransitivity, 30.1s TimeCoverageRelationStatistics Valid=1769, Invalid=23984, Unknown=7, NotChecked=0, Total=25760 [2021-11-07 02:04:57,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-11-07 02:04:57,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 90. [2021-11-07 02:04:57,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 60 states have (on average 1.0666666666666667) internal successors, (64), 61 states have internal predecessors, (64), 10 states have call successors, (10), 4 states have call predecessors, (10), 19 states have return successors, (56), 24 states have call predecessors, (56), 10 states have call successors, (56) [2021-11-07 02:04:57,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 130 transitions. [2021-11-07 02:04:57,801 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 130 transitions. Word has length 138 [2021-11-07 02:04:57,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:04:57,801 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 130 transitions. [2021-11-07 02:04:57,802 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 60 states have (on average 1.6) internal successors, (96), 44 states have internal predecessors, (96), 19 states have call successors, (19), 1 states have call predecessors, (19), 18 states have return successors, (19), 19 states have call predecessors, (19), 19 states have call successors, (19) [2021-11-07 02:04:57,802 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 130 transitions. [2021-11-07 02:04:57,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-07 02:04:57,803 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:04:57,803 INFO L513 BasicCegarLoop]: trace histogram [20, 20, 20, 18, 18, 18, 18, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:04:57,854 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-07 02:04:58,023 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:04:58,023 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:04:58,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:04:58,024 INFO L85 PathProgramCache]: Analyzing trace with hash 72187818, now seen corresponding path program 22 times [2021-11-07 02:04:58,024 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:04:58,024 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [53036232] [2021-11-07 02:04:58,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:04:58,024 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:04:58,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:00,708 INFO L134 CoverageAnalysis]: Checked inductivity of 1256 backedges. 1 proven. 1055 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-07 02:05:00,709 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:05:00,709 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [53036232] [2021-11-07 02:05:00,709 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [53036232] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 02:05:00,709 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2108251406] [2021-11-07 02:05:00,709 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-07 02:05:00,709 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:05:00,709 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:05:00,710 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:05:00,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-07 02:05:03,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:03,977 WARN L261 TraceCheckSpWp]: Trace formula consists of 431 conjuncts, 241 conjunts are in the unsatisfiable core [2021-11-07 02:05:03,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:07,547 INFO L134 CoverageAnalysis]: Checked inductivity of 1256 backedges. 12 proven. 573 refuted. 0 times theorem prover too weak. 671 trivial. 0 not checked. [2021-11-07 02:05:07,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:05:37,238 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [|aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_371_68_156_137|, |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_371_68_156_137|, |aux_div_v_mult_#in~n_BEFORE_CALL_371_68|] [2021-11-07 02:05:37,238 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [884452945] [2021-11-07 02:05:37,239 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-07 02:05:37,239 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 02:05:37,240 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-07 02:05:37,240 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-11-07 02:05:37,240 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64] total 64 [2021-11-07 02:05:37,240 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514204306] [2021-11-07 02:05:37,240 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-07 02:05:37,241 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:05:37,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-07 02:05:37,242 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=467, Invalid=17082, Unknown=7, NotChecked=0, Total=17556 [2021-11-07 02:05:37,242 INFO L87 Difference]: Start difference. First operand 90 states and 130 transitions. Second operand has 64 states, 61 states have (on average 1.5573770491803278) internal successors, (95), 44 states have internal predecessors, (95), 18 states have call successors, (18), 1 states have call predecessors, (18), 19 states have return successors, (20), 20 states have call predecessors, (20), 18 states have call successors, (20) [2021-11-07 02:05:43,316 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:05:43,316 INFO L93 Difference]: Finished difference Result 100 states and 140 transitions. [2021-11-07 02:05:43,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-07 02:05:43,317 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 61 states have (on average 1.5573770491803278) internal successors, (95), 44 states have internal predecessors, (95), 18 states have call successors, (18), 1 states have call predecessors, (18), 19 states have return successors, (20), 20 states have call predecessors, (20), 18 states have call successors, (20) Word has length 145 [2021-11-07 02:05:43,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:05:43,318 INFO L225 Difference]: With dead ends: 100 [2021-11-07 02:05:43,319 INFO L226 Difference]: Without dead ends: 96 [2021-11-07 02:05:43,321 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 185 SyntacticMatches, 4 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5310 ImplicationChecksByTransitivity, 30.3s TimeCoverageRelationStatistics Valid=1757, Invalid=24318, Unknown=7, NotChecked=0, Total=26082 [2021-11-07 02:05:43,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-07 02:05:43,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 90. [2021-11-07 02:05:43,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 60 states have (on average 1.0666666666666667) internal successors, (64), 61 states have internal predecessors, (64), 10 states have call successors, (10), 4 states have call predecessors, (10), 19 states have return successors, (56), 24 states have call predecessors, (56), 10 states have call successors, (56) [2021-11-07 02:05:43,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 130 transitions. [2021-11-07 02:05:43,334 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 130 transitions. Word has length 145 [2021-11-07 02:05:43,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:05:43,335 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 130 transitions. [2021-11-07 02:05:43,335 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 61 states have (on average 1.5573770491803278) internal successors, (95), 44 states have internal predecessors, (95), 18 states have call successors, (18), 1 states have call predecessors, (18), 19 states have return successors, (20), 20 states have call predecessors, (20), 18 states have call successors, (20) [2021-11-07 02:05:43,335 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 130 transitions. [2021-11-07 02:05:43,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2021-11-07 02:05:43,337 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:05:43,337 INFO L513 BasicCegarLoop]: trace histogram [21, 21, 21, 19, 19, 19, 19, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:05:43,374 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-07 02:05:43,553 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-07 02:05:43,553 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:05:43,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:05:43,553 INFO L85 PathProgramCache]: Analyzing trace with hash -679641528, now seen corresponding path program 23 times [2021-11-07 02:05:43,553 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:05:43,554 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [860589378] [2021-11-07 02:05:43,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:05:43,554 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:05:43,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:05:46,644 INFO L134 CoverageAnalysis]: Checked inductivity of 1392 backedges. 0 proven. 1178 refuted. 0 times theorem prover too weak. 214 trivial. 0 not checked. [2021-11-07 02:05:46,644 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:05:46,644 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [860589378] [2021-11-07 02:05:46,644 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [860589378] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 02:05:46,644 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [391190363] [2021-11-07 02:05:46,645 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 02:05:46,645 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:05:46,645 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:05:46,652 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:05:46,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-07 02:05:50,194 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2021-11-07 02:05:50,194 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:05:50,199 WARN L261 TraceCheckSpWp]: Trace formula consists of 450 conjuncts, 253 conjunts are in the unsatisfiable core [2021-11-07 02:05:50,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:05:54,035 INFO L134 CoverageAnalysis]: Checked inductivity of 1392 backedges. 12 proven. 632 refuted. 0 times theorem prover too weak. 748 trivial. 0 not checked. [2021-11-07 02:05:54,035 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:06:24,737 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: Shadow problem: [|aux_div_v_mult_#in~n_BEFORE_CALL_405_102|, |aux_div_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_405_102_156_147|, |aux_mod_aux_mod_aux_mod_v_mult_#in~n_BEFORE_CALL_405_102_156_147|] [2021-11-07 02:06:24,738 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [638448366] [2021-11-07 02:06:24,739 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-07 02:06:24,739 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 02:06:24,739 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-07 02:06:24,739 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-11-07 02:06:24,740 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69] total 69 [2021-11-07 02:06:24,740 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532438452] [2021-11-07 02:06:24,740 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2021-11-07 02:06:24,741 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:06:24,741 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-11-07 02:06:24,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=483, Invalid=18416, Unknown=7, NotChecked=0, Total=18906 [2021-11-07 02:06:24,743 INFO L87 Difference]: Start difference. First operand 90 states and 130 transitions. Second operand has 69 states, 66 states have (on average 1.606060606060606) internal successors, (106), 48 states have internal predecessors, (106), 21 states have call successors, (21), 1 states have call predecessors, (21), 20 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2021-11-07 02:06:32,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:06:32,628 INFO L93 Difference]: Finished difference Result 100 states and 140 transitions. [2021-11-07 02:06:32,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-07 02:06:32,629 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 66 states have (on average 1.606060606060606) internal successors, (106), 48 states have internal predecessors, (106), 21 states have call successors, (21), 1 states have call predecessors, (21), 20 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) Word has length 152 [2021-11-07 02:06:32,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:06:32,630 INFO L225 Difference]: With dead ends: 100 [2021-11-07 02:06:32,631 INFO L226 Difference]: Without dead ends: 96 [2021-11-07 02:06:32,632 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 359 GetRequests, 190 SyntacticMatches, 4 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5218 ImplicationChecksByTransitivity, 33.6s TimeCoverageRelationStatistics Valid=1861, Invalid=25854, Unknown=7, NotChecked=0, Total=27722 [2021-11-07 02:06:32,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-07 02:06:32,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 90. [2021-11-07 02:06:32,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 60 states have (on average 1.0666666666666667) internal successors, (64), 61 states have internal predecessors, (64), 10 states have call successors, (10), 4 states have call predecessors, (10), 19 states have return successors, (56), 24 states have call predecessors, (56), 10 states have call successors, (56) [2021-11-07 02:06:32,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 130 transitions. [2021-11-07 02:06:32,648 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 130 transitions. Word has length 152 [2021-11-07 02:06:32,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:06:32,649 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 130 transitions. [2021-11-07 02:06:32,649 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 66 states have (on average 1.606060606060606) internal successors, (106), 48 states have internal predecessors, (106), 21 states have call successors, (21), 1 states have call predecessors, (21), 20 states have return successors, (21), 21 states have call predecessors, (21), 21 states have call successors, (21) [2021-11-07 02:06:32,649 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 130 transitions. [2021-11-07 02:06:32,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2021-11-07 02:06:32,651 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:06:32,651 INFO L513 BasicCegarLoop]: trace histogram [22, 22, 22, 20, 20, 20, 20, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:06:32,696 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-07 02:06:32,873 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-07 02:06:32,873 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:06:32,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:06:32,874 INFO L85 PathProgramCache]: Analyzing trace with hash 1264518682, now seen corresponding path program 24 times [2021-11-07 02:06:32,874 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 02:06:32,874 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1717962792] [2021-11-07 02:06:32,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:06:32,874 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 02:06:33,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:06:36,651 INFO L134 CoverageAnalysis]: Checked inductivity of 1535 backedges. 0 proven. 1294 refuted. 0 times theorem prover too weak. 241 trivial. 0 not checked. [2021-11-07 02:06:36,651 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 02:06:36,651 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1717962792] [2021-11-07 02:06:36,651 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1717962792] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 02:06:36,651 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2083531571] [2021-11-07 02:06:36,651 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 02:06:36,651 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:06:36,651 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:06:36,652 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:06:36,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-07 02:06:40,608 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 02:06:40,609 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:06:40,613 WARN L261 TraceCheckSpWp]: Trace formula consists of 469 conjuncts, 265 conjunts are in the unsatisfiable core [2021-11-07 02:06:40,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:06:44,698 INFO L134 CoverageAnalysis]: Checked inductivity of 1535 backedges. 12 proven. 694 refuted. 0 times theorem prover too weak. 829 trivial. 0 not checked. [2021-11-07 02:06:44,698 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:07:12,657 WARN L228 Executor]: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) stderr output: (error "out of memory") [2021-11-07 02:07:12,657 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: External (MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1) with exit command (exit)) Received EOF on stdin. stderr output: (error "out of memory") [2021-11-07 02:07:12,658 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1293952948] [2021-11-07 02:07:12,659 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-07 02:07:12,659 INFO L166 IcfgInterpreter]: Building call graph [2021-11-07 02:07:12,660 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:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:609) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-07 02:07:12,660 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-11-07 02:07:12,660 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70] total 70 [2021-11-07 02:07:12,660 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720387206] [2021-11-07 02:07:12,661 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2021-11-07 02:07:12,661 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 02:07:12,661 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2021-11-07 02:07:12,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=477, Invalid=17883, Unknown=0, NotChecked=0, Total=18360 [2021-11-07 02:07:12,673 INFO L87 Difference]: Start difference. First operand 90 states and 130 transitions. Second operand has 70 states, 67 states have (on average 1.5671641791044777) internal successors, (105), 48 states have internal predecessors, (105), 20 states have call successors, (20), 1 states have call predecessors, (20), 21 states have return successors, (22), 22 states have call predecessors, (22), 20 states have call successors, (22) [2021-11-07 02:07:12,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-07 02:07:12,701 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 101 [2021-11-07 02:07:12,741 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-07 02:07:12,889 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:07:12,889 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.MonolithicImplicationChecker@77c92956 at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.lock(ManagedScript.java:82) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.assertCodeBlock(IncrementalHoareTripleChecker.java:356) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.prepareAssertionStackAndAddTransition(IncrementalHoareTripleChecker.java:204) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.IncrementalHoareTripleChecker.checkInternal(IncrementalHoareTripleChecker.java:129) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.ProtectiveHoareTripleChecker.checkInternal(ProtectiveHoareTripleChecker.java:61) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.EfficientHoareTripleChecker.checkInternal(EfficientHoareTripleChecker.java:63) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.hoaretriple.CachingHoareTripleChecker.checkInternal(CachingHoareTripleChecker.java:97) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton$InternalSuccessorComputationHelper.computeSuccWithSolver(AbstractInterpolantAutomaton.java:357) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.DeterministicInterpolantAutomaton.addOtherSuccessors(DeterministicInterpolantAutomaton.java:198) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.computeSuccs(BasicAbstractInterpolantAutomaton.java:78) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.BasicAbstractInterpolantAutomaton.computeSuccs(BasicAbstractInterpolantAutomaton.java:1) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.internalSuccessors(AbstractInterpolantAutomaton.java:233) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.interpolantautomata.transitionappender.AbstractInterpolantAutomaton.internalSuccessors(AbstractInterpolantAutomaton.java:1) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.TotalizeNwa.internalSuccessors(TotalizeNwa.java:213) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ComplementDeterministicNwa.internalSuccessors(ComplementDeterministicNwa.java:121) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ProductNwa.internalSuccessors(ProductNwa.java:216) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.ProductNwa.internalSuccessors(ProductNwa.java:208) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates$ReachableStatesComputation.addInternalsAndSuccessors(NestedWordAutomatonReachableStates.java:1058) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates$ReachableStatesComputation.(NestedWordAutomatonReachableStates.java:960) at de.uni_freiburg.informatik.ultimate.automata.nestedword.reachablestates.NestedWordAutomatonReachableStates.(NestedWordAutomatonReachableStates.java:182) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.Difference.computeDifference(Difference.java:137) at de.uni_freiburg.informatik.ultimate.automata.nestedword.operations.Difference.(Difference.java:90) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.computeAutomataDifference(BasicCegarLoop.java:869) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.refineAbstraction(BasicCegarLoop.java:783) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.refineAbstractionInternal(AbstractCegarLoop.java:462) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:420) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) 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) [2021-11-07 02:07:12,893 INFO L168 Benchmark]: Toolchain (without parser) took 550146.60 ms. Allocated memory was 92.3 MB in the beginning and 1.2 GB in the end (delta: 1.1 GB). Free memory was 57.5 MB in the beginning and 895.4 MB in the end (delta: -837.9 MB). Peak memory consumption was 298.8 MB. Max. memory is 16.1 GB. [2021-11-07 02:07:12,894 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 92.3 MB. Free memory was 65.4 MB in the beginning and 65.4 MB in the end (delta: 21.3 kB). There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 02:07:12,894 INFO L168 Benchmark]: CACSL2BoogieTranslator took 361.56 ms. Allocated memory is still 92.3 MB. Free memory was 57.2 MB in the beginning and 68.4 MB in the end (delta: -11.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-11-07 02:07:12,894 INFO L168 Benchmark]: Boogie Procedure Inliner took 46.64 ms. Allocated memory is still 92.3 MB. Free memory was 68.4 MB in the beginning and 67.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-11-07 02:07:12,895 INFO L168 Benchmark]: Boogie Preprocessor took 43.59 ms. Allocated memory is still 92.3 MB. Free memory was 67.0 MB in the beginning and 65.9 MB in the end (delta: 1.1 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 02:07:12,895 INFO L168 Benchmark]: RCFGBuilder took 497.22 ms. Allocated memory is still 92.3 MB. Free memory was 65.9 MB in the beginning and 55.5 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-11-07 02:07:12,896 INFO L168 Benchmark]: TraceAbstraction took 549187.12 ms. Allocated memory was 92.3 MB in the beginning and 1.2 GB in the end (delta: 1.1 GB). Free memory was 54.8 MB in the beginning and 895.4 MB in the end (delta: -840.6 MB). Peak memory consumption was 297.5 MB. Max. memory is 16.1 GB. [2021-11-07 02:07:12,898 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 92.3 MB. Free memory was 65.4 MB in the beginning and 65.4 MB in the end (delta: 21.3 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 361.56 ms. Allocated memory is still 92.3 MB. Free memory was 57.2 MB in the beginning and 68.4 MB in the end (delta: -11.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 46.64 ms. Allocated memory is still 92.3 MB. Free memory was 68.4 MB in the beginning and 67.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 43.59 ms. Allocated memory is still 92.3 MB. Free memory was 67.0 MB in the beginning and 65.9 MB in the end (delta: 1.1 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 497.22 ms. Allocated memory is still 92.3 MB. Free memory was 65.9 MB in the beginning and 55.5 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 549187.12 ms. Allocated memory was 92.3 MB in the beginning and 1.2 GB in the end (delta: 1.1 GB). Free memory was 54.8 MB in the beginning and 895.4 MB in the end (delta: -840.6 MB). Peak memory consumption was 297.5 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.MonolithicImplicationChecker@77c92956 de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: IllegalStateException: ManagedScript already locked by de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.MonolithicImplicationChecker@77c92956: de.uni_freiburg.informatik.ultimate.lib.smtlibutils.ManagedScript.lock(ManagedScript.java:82) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/MultCommutative-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8 --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 ce29b37e076ab683230ebf17073db3b7759ea39570dd2ef64322b6d43bb636cd --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 02:07:15,302 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 02:07:15,305 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 02:07:15,351 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 02:07:15,351 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 02:07:15,353 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 02:07:15,355 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 02:07:15,358 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 02:07:15,361 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 02:07:15,362 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 02:07:15,364 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 02:07:15,366 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 02:07:15,366 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 02:07:15,368 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 02:07:15,370 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 02:07:15,372 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 02:07:15,373 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 02:07:15,375 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 02:07:15,378 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 02:07:15,381 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 02:07:15,384 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 02:07:15,386 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 02:07:15,388 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 02:07:15,389 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 02:07:15,394 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 02:07:15,394 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 02:07:15,395 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 02:07:15,396 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 02:07:15,397 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 02:07:15,399 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 02:07:15,399 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 02:07:15,401 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 02:07:15,402 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 02:07:15,403 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 02:07:15,405 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 02:07:15,406 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 02:07:15,407 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 02:07:15,408 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 02:07:15,408 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 02:07:15,410 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 02:07:15,411 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 02:07:15,412 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-07 02:07:15,444 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 02:07:15,444 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 02:07:15,448 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 02:07:15,448 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 02:07:15,449 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 02:07:15,449 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 02:07:15,449 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 02:07:15,449 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 02:07:15,450 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 02:07:15,451 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 02:07:15,452 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 02:07:15,453 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 02:07:15,453 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 02:07:15,453 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 02:07:15,453 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 02:07:15,454 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 02:07:15,454 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 02:07:15,454 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-07 02:07:15,454 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-07 02:07:15,455 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 02:07:15,455 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 02:07:15,455 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 02:07:15,455 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 02:07:15,456 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 02:07:15,456 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-07 02:07:15,457 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 02:07:15,457 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:07:15,457 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 02:07:15,458 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 02:07:15,458 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 02:07:15,459 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-07 02:07:15,459 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-07 02:07:15,459 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 02:07:15,459 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 02:07:15,460 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 02:07:15,460 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ce29b37e076ab683230ebf17073db3b7759ea39570dd2ef64322b6d43bb636cd [2021-11-07 02:07:15,918 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 02:07:15,946 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 02:07:15,950 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 02:07:15,951 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 02:07:15,952 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 02:07:15,954 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/recursive/MultCommutative-2.c [2021-11-07 02:07:16,030 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/data/aa039f15b/59d9b674c06f4b4abd51b2d31d00ea18/FLAG29693b15c [2021-11-07 02:07:16,661 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 02:07:16,662 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/sv-benchmarks/c/recursive/MultCommutative-2.c [2021-11-07 02:07:16,669 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/data/aa039f15b/59d9b674c06f4b4abd51b2d31d00ea18/FLAG29693b15c [2021-11-07 02:07:16,997 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/data/aa039f15b/59d9b674c06f4b4abd51b2d31d00ea18 [2021-11-07 02:07:17,002 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 02:07:17,006 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 02:07:17,010 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 02:07:17,010 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 02:07:17,014 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 02:07:17,015 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:07:16" (1/1) ... [2021-11-07 02:07:17,018 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@8cf043f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:07:17, skipping insertion in model container [2021-11-07 02:07:17,018 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 02:07:16" (1/1) ... [2021-11-07 02:07:17,027 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 02:07:17,046 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 02:07:17,272 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/sv-benchmarks/c/recursive/MultCommutative-2.c[970,983] [2021-11-07 02:07:17,282 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:07:17,311 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 02:07:17,342 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/sv-benchmarks/c/recursive/MultCommutative-2.c[970,983] [2021-11-07 02:07:17,344 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 02:07:17,364 INFO L208 MainTranslator]: Completed translation [2021-11-07 02:07:17,365 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:07:17 WrapperNode [2021-11-07 02:07:17,366 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 02:07:17,367 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 02:07:17,367 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 02:07:17,367 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 02:07:17,411 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:07:17" (1/1) ... [2021-11-07 02:07:17,447 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:07:17" (1/1) ... [2021-11-07 02:07:17,480 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 02:07:17,482 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 02:07:17,482 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 02:07:17,482 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 02:07:17,491 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:07:17" (1/1) ... [2021-11-07 02:07:17,492 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:07:17" (1/1) ... [2021-11-07 02:07:17,506 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:07:17" (1/1) ... [2021-11-07 02:07:17,506 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:07:17" (1/1) ... [2021-11-07 02:07:17,513 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:07:17" (1/1) ... [2021-11-07 02:07:17,517 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:07:17" (1/1) ... [2021-11-07 02:07:17,525 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:07:17" (1/1) ... [2021-11-07 02:07:17,533 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 02:07:17,536 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 02:07:17,537 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 02:07:17,538 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 02:07:17,539 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:07:17" (1/1) ... [2021-11-07 02:07:17,548 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 02:07:17,563 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:07:17,579 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 02:07:17,616 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 02:07:17,642 INFO L130 BoogieDeclarations]: Found specification of procedure mult [2021-11-07 02:07:17,642 INFO L138 BoogieDeclarations]: Found implementation of procedure mult [2021-11-07 02:07:17,643 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 02:07:17,643 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 02:07:17,643 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-07 02:07:17,643 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 02:07:17,962 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 02:07:17,963 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-07 02:07:17,965 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 02:07:17 BoogieIcfgContainer [2021-11-07 02:07:17,965 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 02:07:17,967 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 02:07:17,967 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 02:07:17,970 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 02:07:17,971 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 02:07:16" (1/3) ... [2021-11-07 02:07:17,972 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b4c0c9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 02:07:17, skipping insertion in model container [2021-11-07 02:07:17,972 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 02:07:17" (2/3) ... [2021-11-07 02:07:17,973 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b4c0c9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 02:07:17, skipping insertion in model container [2021-11-07 02:07:17,973 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 02:07:17" (3/3) ... [2021-11-07 02:07:17,974 INFO L111 eAbstractionObserver]: Analyzing ICFG MultCommutative-2.c [2021-11-07 02:07:17,981 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 02:07:17,981 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-07 02:07:18,036 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 02:07:18,044 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-07 02:07:18,045 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-07 02:07:18,073 INFO L276 IsEmpty]: Start isEmpty. Operand has 23 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-07 02:07:18,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-07 02:07:18,082 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:07:18,083 INFO L513 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:07:18,084 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:07:18,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:07:18,107 INFO L85 PathProgramCache]: Analyzing trace with hash -1513944532, now seen corresponding path program 1 times [2021-11-07 02:07:18,128 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:07:18,128 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [659619766] [2021-11-07 02:07:18,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:07:18,130 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:07:18,130 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:07:18,133 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:07:18,136 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-07 02:07:18,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:07:18,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 02:07:18,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:07:18,478 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 02:07:18,478 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:07:18,713 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-07 02:07:18,717 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:07:18,717 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [659619766] [2021-11-07 02:07:18,718 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [659619766] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:07:18,719 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [395712528] [2021-11-07 02:07:18,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:07:18,719 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:07:18,720 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:07:18,729 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:07:18,757 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (3)] Waiting until timeout for monitored process [2021-11-07 02:07:18,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:07:18,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:07:18,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:07:19,058 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-07 02:07:19,058 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:07:19,305 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-07 02:07:19,306 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [395712528] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:07:19,306 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:07:19,307 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [6, 5] total 16 [2021-11-07 02:07:19,309 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010938877] [2021-11-07 02:07:19,315 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 02:07:19,316 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:07:19,332 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 02:07:19,333 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2021-11-07 02:07:19,336 INFO L87 Difference]: Start difference. First operand has 23 states, 16 states have (on average 1.375) internal successors, (22), 17 states have internal predecessors, (22), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 9 states, 8 states have (on average 1.75) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-07 02:07:19,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:07:19,453 INFO L93 Difference]: Finished difference Result 44 states and 55 transitions. [2021-11-07 02:07:19,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 02:07:19,455 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.75) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 20 [2021-11-07 02:07:19,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:07:19,466 INFO L225 Difference]: With dead ends: 44 [2021-11-07 02:07:19,466 INFO L226 Difference]: Without dead ends: 28 [2021-11-07 02:07:19,470 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2021-11-07 02:07:19,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-07 02:07:19,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 24. [2021-11-07 02:07:19,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.125) internal successors, (18), 17 states have internal predecessors, (18), 5 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (9), 5 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-07 02:07:19,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2021-11-07 02:07:19,522 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 20 [2021-11-07 02:07:19,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:07:19,523 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2021-11-07 02:07:19,523 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.75) internal successors, (14), 6 states have internal predecessors, (14), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-07 02:07:19,523 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2021-11-07 02:07:19,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-07 02:07:19,526 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:07:19,527 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:07:19,546 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-07 02:07:19,747 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (3)] Forceful destruction successful, exit code 0 [2021-11-07 02:07:19,940 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:07:19,941 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:07:19,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:07:19,942 INFO L85 PathProgramCache]: Analyzing trace with hash 555960324, now seen corresponding path program 1 times [2021-11-07 02:07:19,943 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:07:19,943 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [712524966] [2021-11-07 02:07:19,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:07:19,944 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:07:19,944 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:07:19,946 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:07:19,957 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-07 02:07:20,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:07:20,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 02:07:20,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:07:20,252 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-07 02:07:20,252 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:07:20,453 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-07 02:07:20,453 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:07:20,454 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [712524966] [2021-11-07 02:07:20,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [712524966] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:07:20,456 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [289253327] [2021-11-07 02:07:20,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:07:20,457 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:07:20,457 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:07:20,461 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:07:20,467 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (5)] Waiting until timeout for monitored process [2021-11-07 02:07:20,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:07:20,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-07 02:07:20,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:07:20,874 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-07 02:07:20,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:07:21,074 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-07 02:07:21,074 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [289253327] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:07:21,074 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 2 imperfect interpolant sequences. [2021-11-07 02:07:21,075 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 14 [2021-11-07 02:07:21,075 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1954153042] [2021-11-07 02:07:21,076 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-07 02:07:21,077 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:07:21,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-07 02:07:21,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2021-11-07 02:07:21,079 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 10 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-07 02:07:21,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:07:21,143 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2021-11-07 02:07:21,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-07 02:07:21,144 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) Word has length 26 [2021-11-07 02:07:21,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:07:21,146 INFO L225 Difference]: With dead ends: 37 [2021-11-07 02:07:21,147 INFO L226 Difference]: Without dead ends: 33 [2021-11-07 02:07:21,148 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2021-11-07 02:07:21,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-07 02:07:21,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 25. [2021-11-07 02:07:21,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 17 states have (on average 1.1176470588235294) internal successors, (19), 17 states have internal predecessors, (19), 5 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (9), 6 states have call predecessors, (9), 5 states have call successors, (9) [2021-11-07 02:07:21,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 33 transitions. [2021-11-07 02:07:21,160 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 33 transitions. Word has length 26 [2021-11-07 02:07:21,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:07:21,161 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 33 transitions. [2021-11-07 02:07:21,161 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 6 states have internal predecessors, (16), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (4), 4 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-07 02:07:21,161 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 33 transitions. [2021-11-07 02:07:21,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-07 02:07:21,163 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:07:21,163 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:07:21,185 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-07 02:07:21,379 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (5)] Forceful destruction successful, exit code 0 [2021-11-07 02:07:21,577 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:07:21,578 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:07:21,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:07:21,579 INFO L85 PathProgramCache]: Analyzing trace with hash -1817517416, now seen corresponding path program 1 times [2021-11-07 02:07:21,579 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:07:21,580 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1827546428] [2021-11-07 02:07:21,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:07:21,580 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:07:21,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:07:21,584 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:07:21,586 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-07 02:07:21,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:07:21,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 02:07:21,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:07:21,838 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-07 02:07:21,838 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:07:22,009 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-07 02:07:22,009 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:07:22,009 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1827546428] [2021-11-07 02:07:22,010 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1827546428] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:07:22,010 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1353947683] [2021-11-07 02:07:22,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:07:22,010 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:07:22,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:07:22,012 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:07:22,045 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (7)] Waiting until timeout for monitored process [2021-11-07 02:07:22,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:07:22,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-07 02:07:22,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:07:22,514 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 02:07:22,515 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:07:22,928 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-07 02:07:22,929 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1353947683] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:07:22,929 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [268169478] [2021-11-07 02:07:22,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:07:22,930 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:07:22,930 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:07:22,933 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:07:22,961 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-07 02:07:23,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:07:23,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 02:07:23,098 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:07:23,170 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-07 02:07:23,171 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:07:23,308 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-07 02:07:23,308 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [268169478] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:07:23,309 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 02:07:23,309 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 12, 12, 6, 5] total 25 [2021-11-07 02:07:23,309 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1963092060] [2021-11-07 02:07:23,311 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-07 02:07:23,311 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:07:23,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-07 02:07:23,314 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=526, Unknown=0, NotChecked=0, Total=600 [2021-11-07 02:07:23,315 INFO L87 Difference]: Start difference. First operand 25 states and 33 transitions. Second operand has 25 states, 22 states have (on average 2.090909090909091) internal successors, (46), 19 states have internal predecessors, (46), 7 states have call successors, (8), 1 states have call predecessors, (8), 7 states have return successors, (11), 9 states have call predecessors, (11), 7 states have call successors, (11) [2021-11-07 02:07:24,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:07:24,028 INFO L93 Difference]: Finished difference Result 44 states and 70 transitions. [2021-11-07 02:07:24,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-07 02:07:24,029 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 22 states have (on average 2.090909090909091) internal successors, (46), 19 states have internal predecessors, (46), 7 states have call successors, (8), 1 states have call predecessors, (8), 7 states have return successors, (11), 9 states have call predecessors, (11), 7 states have call successors, (11) Word has length 27 [2021-11-07 02:07:24,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:07:24,031 INFO L225 Difference]: With dead ends: 44 [2021-11-07 02:07:24,031 INFO L226 Difference]: Without dead ends: 30 [2021-11-07 02:07:24,033 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=147, Invalid=909, Unknown=0, NotChecked=0, Total=1056 [2021-11-07 02:07:24,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-07 02:07:24,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 22. [2021-11-07 02:07:24,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 16 states have internal predecessors, (17), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-07 02:07:24,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 28 transitions. [2021-11-07 02:07:24,045 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 28 transitions. Word has length 27 [2021-11-07 02:07:24,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:07:24,046 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 28 transitions. [2021-11-07 02:07:24,047 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 22 states have (on average 2.090909090909091) internal successors, (46), 19 states have internal predecessors, (46), 7 states have call successors, (8), 1 states have call predecessors, (8), 7 states have return successors, (11), 9 states have call predecessors, (11), 7 states have call successors, (11) [2021-11-07 02:07:24,048 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 28 transitions. [2021-11-07 02:07:24,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-07 02:07:24,051 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:07:24,052 INFO L513 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:07:24,069 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-07 02:07:24,267 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (7)] Ended with exit code 0 [2021-11-07 02:07:24,488 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-07 02:07:24,666 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:07:24,666 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:07:24,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:07:24,667 INFO L85 PathProgramCache]: Analyzing trace with hash 2011031750, now seen corresponding path program 2 times [2021-11-07 02:07:24,668 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:07:24,668 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1910410649] [2021-11-07 02:07:24,668 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 02:07:24,668 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:07:24,669 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:07:24,677 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:07:24,678 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-07 02:07:24,877 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 02:07:24,878 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:07:24,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-07 02:07:24,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:07:25,036 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-07 02:07:25,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:07:25,221 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-07 02:07:25,221 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:07:25,222 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1910410649] [2021-11-07 02:07:25,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1910410649] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 02:07:25,222 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:07:25,222 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 5] imperfect sequences [] total 9 [2021-11-07 02:07:25,222 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1366235445] [2021-11-07 02:07:25,223 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-07 02:07:25,223 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:07:25,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-07 02:07:25,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2021-11-07 02:07:25,225 INFO L87 Difference]: Start difference. First operand 22 states and 28 transitions. Second operand has 9 states, 9 states have (on average 3.0) internal successors, (27), 9 states have internal predecessors, (27), 2 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-07 02:07:25,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:07:25,353 INFO L93 Difference]: Finished difference Result 29 states and 36 transitions. [2021-11-07 02:07:25,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-07 02:07:25,354 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 9 states have internal predecessors, (27), 2 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) Word has length 27 [2021-11-07 02:07:25,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:07:25,356 INFO L225 Difference]: With dead ends: 29 [2021-11-07 02:07:25,356 INFO L226 Difference]: Without dead ends: 25 [2021-11-07 02:07:25,357 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2021-11-07 02:07:25,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-07 02:07:25,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2021-11-07 02:07:25,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 16 states have internal predecessors, (17), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2021-11-07 02:07:25,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2021-11-07 02:07:25,363 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 27 [2021-11-07 02:07:25,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:07:25,364 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2021-11-07 02:07:25,364 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.0) internal successors, (27), 9 states have internal predecessors, (27), 2 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-07 02:07:25,365 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2021-11-07 02:07:25,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-07 02:07:25,366 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:07:25,367 INFO L513 BasicCegarLoop]: trace histogram [4, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:07:25,394 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-07 02:07:25,581 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:07:25,581 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:07:25,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:07:25,582 INFO L85 PathProgramCache]: Analyzing trace with hash -760266050, now seen corresponding path program 3 times [2021-11-07 02:07:25,583 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:07:25,583 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [360350362] [2021-11-07 02:07:25,583 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 02:07:25,583 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:07:25,584 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:07:25,585 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:07:25,590 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Waiting until timeout for monitored process [2021-11-07 02:07:25,792 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-07 02:07:25,792 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:07:25,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-07 02:07:25,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:07:26,324 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-07 02:07:26,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:07:27,876 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:07:27,876 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:07:27,876 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [360350362] [2021-11-07 02:07:27,877 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [360350362] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:07:27,877 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1349601978] [2021-11-07 02:07:27,877 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 02:07:27,878 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:07:27,878 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:07:27,881 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:07:27,889 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (11)] Waiting until timeout for monitored process [2021-11-07 02:07:28,202 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-07 02:07:28,203 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:07:28,204 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-07 02:07:28,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:07:28,582 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-07 02:07:28,582 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:07:29,606 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:07:29,607 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1349601978] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:07:29,611 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [544554554] [2021-11-07 02:07:29,611 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-07 02:07:29,612 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:07:29,612 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:07:29,615 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:07:29,641 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-07 02:07:30,006 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-07 02:07:30,006 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:07:30,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-07 02:07:30,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:07:30,552 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-07 02:07:30,552 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:07:31,584 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 02:07:31,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [544554554] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:07:31,585 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 02:07:31,585 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 13, 14, 13, 14] total 39 [2021-11-07 02:07:31,585 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837077774] [2021-11-07 02:07:31,587 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-07 02:07:31,587 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:07:31,588 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-07 02:07:31,589 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=1312, Unknown=0, NotChecked=0, Total=1482 [2021-11-07 02:07:31,590 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 39 states, 33 states have (on average 1.5757575757575757) internal successors, (52), 26 states have internal predecessors, (52), 12 states have call successors, (12), 1 states have call predecessors, (12), 5 states have return successors, (13), 13 states have call predecessors, (13), 12 states have call successors, (13) [2021-11-07 02:07:32,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:07:32,837 INFO L93 Difference]: Finished difference Result 50 states and 65 transitions. [2021-11-07 02:07:32,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-07 02:07:32,838 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 33 states have (on average 1.5757575757575757) internal successors, (52), 26 states have internal predecessors, (52), 12 states have call successors, (12), 1 states have call predecessors, (12), 5 states have return successors, (13), 13 states have call predecessors, (13), 12 states have call successors, (13) Word has length 34 [2021-11-07 02:07:32,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:07:32,840 INFO L225 Difference]: With dead ends: 50 [2021-11-07 02:07:32,840 INFO L226 Difference]: Without dead ends: 42 [2021-11-07 02:07:32,843 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 161 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 793 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=339, Invalid=2313, Unknown=0, NotChecked=0, Total=2652 [2021-11-07 02:07:32,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-11-07 02:07:32,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 34. [2021-11-07 02:07:32,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 24 states have internal predecessors, (24), 6 states have call successors, (6), 1 states have call predecessors, (6), 5 states have return successors, (19), 8 states have call predecessors, (19), 6 states have call successors, (19) [2021-11-07 02:07:32,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 49 transitions. [2021-11-07 02:07:32,858 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 49 transitions. Word has length 34 [2021-11-07 02:07:32,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:07:32,858 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 49 transitions. [2021-11-07 02:07:32,859 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 33 states have (on average 1.5757575757575757) internal successors, (52), 26 states have internal predecessors, (52), 12 states have call successors, (12), 1 states have call predecessors, (12), 5 states have return successors, (13), 13 states have call predecessors, (13), 12 states have call successors, (13) [2021-11-07 02:07:32,859 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 49 transitions. [2021-11-07 02:07:32,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-07 02:07:32,862 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:07:32,862 INFO L513 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:07:32,889 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (10)] Forceful destruction successful, exit code 0 [2021-11-07 02:07:33,102 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-07 02:07:33,278 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (11)] Forceful destruction successful, exit code 0 [2021-11-07 02:07:33,476 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt [2021-11-07 02:07:33,477 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:07:33,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:07:33,477 INFO L85 PathProgramCache]: Analyzing trace with hash 1361186662, now seen corresponding path program 1 times [2021-11-07 02:07:33,477 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:07:33,477 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1794156840] [2021-11-07 02:07:33,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:07:33,478 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:07:33,478 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:07:33,481 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:07:33,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-07 02:07:33,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:07:33,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 02:07:33,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:07:33,948 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 22 proven. 3 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-07 02:07:33,949 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:07:34,493 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 22 proven. 4 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-07 02:07:34,493 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:07:34,493 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1794156840] [2021-11-07 02:07:34,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1794156840] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:07:34,494 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [972374254] [2021-11-07 02:07:34,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:07:34,494 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:07:34,495 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:07:34,498 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:07:34,504 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (14)] Waiting until timeout for monitored process [2021-11-07 02:07:34,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:07:34,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 02:07:34,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:07:35,115 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 22 proven. 3 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-07 02:07:35,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:07:35,484 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 22 proven. 4 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-07 02:07:35,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [972374254] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:07:35,485 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2121785950] [2021-11-07 02:07:35,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 02:07:35,485 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:07:35,485 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:07:35,486 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:07:35,541 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-07 02:07:35,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 02:07:35,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-07 02:07:35,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:07:36,062 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 28 proven. 1 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-11-07 02:07:36,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:07:39,387 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-07 02:07:39,387 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2121785950] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-07 02:07:39,388 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 5 imperfect interpolant sequences. [2021-11-07 02:07:39,388 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [7, 8, 7, 8, 6] total 17 [2021-11-07 02:07:39,388 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603403813] [2021-11-07 02:07:39,389 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 02:07:39,389 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:07:39,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 02:07:39,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=210, Unknown=1, NotChecked=0, Total=272 [2021-11-07 02:07:39,390 INFO L87 Difference]: Start difference. First operand 34 states and 49 transitions. Second operand has 5 states, 4 states have (on average 5.5) internal successors, (22), 5 states have internal predecessors, (22), 2 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-07 02:07:40,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:07:40,084 INFO L93 Difference]: Finished difference Result 59 states and 91 transitions. [2021-11-07 02:07:40,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-07 02:07:40,085 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 5.5) internal successors, (22), 5 states have internal predecessors, (22), 2 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 40 [2021-11-07 02:07:40,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:07:40,090 INFO L225 Difference]: With dead ends: 59 [2021-11-07 02:07:40,090 INFO L226 Difference]: Without dead ends: 34 [2021-11-07 02:07:40,091 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 234 GetRequests, 219 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=61, Invalid=210, Unknown=1, NotChecked=0, Total=272 [2021-11-07 02:07:40,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-07 02:07:40,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-11-07 02:07:40,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 24 states have internal predecessors, (24), 6 states have call successors, (6), 1 states have call predecessors, (6), 5 states have return successors, (18), 8 states have call predecessors, (18), 6 states have call successors, (18) [2021-11-07 02:07:40,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 48 transitions. [2021-11-07 02:07:40,105 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 48 transitions. Word has length 40 [2021-11-07 02:07:40,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:07:40,106 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 48 transitions. [2021-11-07 02:07:40,106 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 5.5) internal successors, (22), 5 states have internal predecessors, (22), 2 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-07 02:07:40,106 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 48 transitions. [2021-11-07 02:07:40,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-07 02:07:40,107 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:07:40,108 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 5, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:07:40,115 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (14)] Forceful destruction successful, exit code 0 [2021-11-07 02:07:40,332 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2021-11-07 02:07:40,518 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-07 02:07:40,708 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:07:40,709 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:07:40,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:07:40,709 INFO L85 PathProgramCache]: Analyzing trace with hash -757286924, now seen corresponding path program 2 times [2021-11-07 02:07:40,709 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:07:40,709 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [654764199] [2021-11-07 02:07:40,709 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 02:07:40,709 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:07:40,710 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:07:40,710 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:07:40,713 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Waiting until timeout for monitored process [2021-11-07 02:07:41,215 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 02:07:41,215 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:07:41,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 02:07:41,222 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:07:41,487 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 27 proven. 7 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-07 02:07:41,487 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:07:41,999 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 27 proven. 8 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-11-07 02:07:41,999 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:07:42,000 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [654764199] [2021-11-07 02:07:42,000 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [654764199] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:07:42,000 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1989270636] [2021-11-07 02:07:42,000 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 02:07:42,001 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:07:42,001 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:07:42,004 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:07:42,006 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Waiting until timeout for monitored process [2021-11-07 02:07:42,618 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 02:07:42,618 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:07:42,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-07 02:07:42,620 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:07:42,776 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 27 proven. 7 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-07 02:07:42,776 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:07:43,199 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 27 proven. 8 refuted. 0 times theorem prover too weak. 41 trivial. 0 not checked. [2021-11-07 02:07:43,199 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1989270636] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:07:43,200 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [345559611] [2021-11-07 02:07:43,200 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-07 02:07:43,200 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:07:43,200 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:07:43,205 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:07:43,229 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-07 02:07:43,717 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-07 02:07:43,717 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:07:43,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 98 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-07 02:07:43,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:07:44,025 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 41 proven. 9 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-07 02:07:44,025 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:07:50,706 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 42 proven. 11 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-07 02:07:50,707 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [345559611] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-07 02:07:50,707 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 6 imperfect interpolant sequences. [2021-11-07 02:07:50,707 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 7, 8, 10, 9] total 22 [2021-11-07 02:07:50,707 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1673556645] [2021-11-07 02:07:50,708 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-07 02:07:50,709 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-07 02:07:50,710 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-07 02:07:50,710 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=362, Unknown=2, NotChecked=0, Total=462 [2021-11-07 02:07:50,711 INFO L87 Difference]: Start difference. First operand 34 states and 48 transitions. Second operand has 22 states, 17 states have (on average 3.2941176470588234) internal successors, (56), 22 states have internal predecessors, (56), 12 states have call successors, (16), 1 states have call predecessors, (16), 8 states have return successors, (17), 9 states have call predecessors, (17), 12 states have call successors, (17) [2021-11-07 02:07:50,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 02:07:50,984 INFO L93 Difference]: Finished difference Result 57 states and 80 transitions. [2021-11-07 02:07:50,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-07 02:07:50,985 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 17 states have (on average 3.2941176470588234) internal successors, (56), 22 states have internal predecessors, (56), 12 states have call successors, (16), 1 states have call predecessors, (16), 8 states have return successors, (17), 9 states have call predecessors, (17), 12 states have call successors, (17) Word has length 47 [2021-11-07 02:07:50,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 02:07:50,986 INFO L225 Difference]: With dead ends: 57 [2021-11-07 02:07:50,986 INFO L226 Difference]: Without dead ends: 23 [2021-11-07 02:07:50,988 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 258 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=153, Invalid=495, Unknown=2, NotChecked=0, Total=650 [2021-11-07 02:07:50,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-07 02:07:50,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-11-07 02:07:50,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 16 states have (on average 1.0625) internal successors, (17), 17 states have internal predecessors, (17), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (5), 4 states have call predecessors, (5), 3 states have call successors, (5) [2021-11-07 02:07:50,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2021-11-07 02:07:50,995 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 47 [2021-11-07 02:07:50,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 02:07:50,996 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2021-11-07 02:07:50,996 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 17 states have (on average 3.2941176470588234) internal successors, (56), 22 states have internal predecessors, (56), 12 states have call successors, (16), 1 states have call predecessors, (16), 8 states have return successors, (17), 9 states have call predecessors, (17), 12 states have call successors, (17) [2021-11-07 02:07:50,997 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2021-11-07 02:07:50,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-07 02:07:50,998 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 02:07:50,998 INFO L513 BasicCegarLoop]: trace histogram [6, 6, 6, 4, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 02:07:51,010 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (16)] Forceful destruction successful, exit code 0 [2021-11-07 02:07:51,208 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (17)] Forceful destruction successful, exit code 0 [2021-11-07 02:07:51,434 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-07 02:07:51,605 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:07:51,605 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 02:07:51,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 02:07:51,606 INFO L85 PathProgramCache]: Analyzing trace with hash 1519724908, now seen corresponding path program 4 times [2021-11-07 02:07:51,606 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-07 02:07:51,606 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1812731898] [2021-11-07 02:07:51,606 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 02:07:51,607 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-07 02:07:51,607 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat [2021-11-07 02:07:51,621 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-07 02:07:51,625 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-07 02:07:52,119 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 02:07:52,119 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:07:52,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-07 02:07:52,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:07:52,755 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 4 proven. 40 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-07 02:07:52,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:07:54,172 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-07 02:07:54,172 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1812731898] [2021-11-07 02:07:54,173 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: no int: (_ BitVec 32) [2021-11-07 02:07:54,173 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [554346784] [2021-11-07 02:07:54,173 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 02:07:54,173 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-07 02:07:54,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 [2021-11-07 02:07:54,180 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-07 02:07:54,185 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2021-11-07 02:07:54,840 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 02:07:54,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:07:54,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-07 02:07:54,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:07:55,233 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 4 proven. 40 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-07 02:07:55,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:07:56,243 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: no int: (_ BitVec 32) [2021-11-07 02:07:56,243 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2046855024] [2021-11-07 02:07:56,243 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-07 02:07:56,243 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 02:07:56,244 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 02:07:56,245 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 02:07:56,264 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-07 02:07:56,972 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-07 02:07:56,972 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-07 02:07:56,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-07 02:07:56,975 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 02:07:57,405 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 4 proven. 40 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-07 02:07:57,405 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 02:07:57,785 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_DEPENDING: no int: (_ BitVec 32) [2021-11-07 02:07:57,785 INFO L186 FreeRefinementEngine]: Constructing automaton from 0 perfect and 0 imperfect interpolant sequences. [2021-11-07 02:07:57,785 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [] total 0 [2021-11-07 02:07:57,786 ERROR L172 FreeRefinementEngine]: Strategy WALRUS failed to provide any proof altough trace is infeasible [2021-11-07 02:07:57,786 INFO L627 BasicCegarLoop]: Counterexample might be feasible [2021-11-07 02:07:57,794 INFO L764 garLoopResultBuilder]: Registering result UNKNOWN for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION [2021-11-07 02:07:57,844 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-07 02:07:58,030 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt (20)] Forceful destruction successful, exit code 0 [2021-11-07 02:07:58,227 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-07 02:07:58,418 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/cvc4 --incremental --print-success --lang smt,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/mathsat -unsat_core_generation=3 [2021-11-07 02:07:58,420 INFO L731 BasicCegarLoop]: Path program histogram: [4, 2, 1, 1] [2021-11-07 02:07:58,423 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-07 02:07:58,435 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.11 02:07:58 BoogieIcfgContainer [2021-11-07 02:07:58,435 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-07 02:07:58,435 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-07 02:07:58,436 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-07 02:07:58,436 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-07 02:07:58,436 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 02:07:17" (3/4) ... [2021-11-07 02:07:58,439 INFO L140 WitnessPrinter]: No result that supports witness generation found [2021-11-07 02:07:58,439 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-07 02:07:58,440 INFO L168 Benchmark]: Toolchain (without parser) took 41433.95 ms. Allocated memory was 67.1 MB in the beginning and 142.6 MB in the end (delta: 75.5 MB). Free memory was 46.9 MB in the beginning and 71.6 MB in the end (delta: -24.7 MB). Peak memory consumption was 50.1 MB. Max. memory is 16.1 GB. [2021-11-07 02:07:58,441 INFO L168 Benchmark]: CDTParser took 0.32 ms. Allocated memory is still 67.1 MB. Free memory is still 47.3 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 02:07:58,441 INFO L168 Benchmark]: CACSL2BoogieTranslator took 356.15 ms. Allocated memory is still 67.1 MB. Free memory was 46.8 MB in the beginning and 36.9 MB in the end (delta: 9.9 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2021-11-07 02:07:58,442 INFO L168 Benchmark]: Boogie Procedure Inliner took 113.67 ms. Allocated memory is still 67.1 MB. Free memory was 36.9 MB in the beginning and 49.8 MB in the end (delta: -12.9 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-11-07 02:07:58,442 INFO L168 Benchmark]: Boogie Preprocessor took 53.40 ms. Allocated memory is still 67.1 MB. Free memory was 49.8 MB in the beginning and 48.7 MB in the end (delta: 1.1 MB). There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 02:07:58,443 INFO L168 Benchmark]: RCFGBuilder took 429.31 ms. Allocated memory is still 67.1 MB. Free memory was 48.7 MB in the beginning and 38.9 MB in the end (delta: 9.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2021-11-07 02:07:58,443 INFO L168 Benchmark]: TraceAbstraction took 40467.76 ms. Allocated memory was 67.1 MB in the beginning and 142.6 MB in the end (delta: 75.5 MB). Free memory was 38.4 MB in the beginning and 71.6 MB in the end (delta: -33.2 MB). Peak memory consumption was 43.0 MB. Max. memory is 16.1 GB. [2021-11-07 02:07:58,443 INFO L168 Benchmark]: Witness Printer took 3.59 ms. Allocated memory is still 142.6 MB. Free memory is still 71.6 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-11-07 02:07:58,446 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.32 ms. Allocated memory is still 67.1 MB. Free memory is still 47.3 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 356.15 ms. Allocated memory is still 67.1 MB. Free memory was 46.8 MB in the beginning and 36.9 MB in the end (delta: 9.9 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 113.67 ms. Allocated memory is still 67.1 MB. Free memory was 36.9 MB in the beginning and 49.8 MB in the end (delta: -12.9 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 53.40 ms. Allocated memory is still 67.1 MB. Free memory was 49.8 MB in the beginning and 48.7 MB in the end (delta: 1.1 MB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 429.31 ms. Allocated memory is still 67.1 MB. Free memory was 48.7 MB in the beginning and 38.9 MB in the end (delta: 9.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * TraceAbstraction took 40467.76 ms. Allocated memory was 67.1 MB in the beginning and 142.6 MB in the end (delta: 75.5 MB). Free memory was 38.4 MB in the beginning and 71.6 MB in the end (delta: -33.2 MB). Peak memory consumption was 43.0 MB. Max. memory is 16.1 GB. * Witness Printer took 3.59 ms. Allocated memory is still 142.6 MB. Free memory is still 71.6 MB. There was no memory consumed. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - UnprovableResult [Line: 39]: Unable to prove that call to reach_error is unreachable Unable to prove that call to reach_error is unreachable Reason: unable to decide satisfiability of path constraint. Possible FailurePath: [L28] int m = __VERIFIER_nondet_int(); [L29] COND FALSE !(m < 0 || m > 46340) [L32] int n = __VERIFIER_nondet_int(); [L33] COND FALSE !(n < 0 || n > 46340) [L36] CALL, EXPR mult(m, n) [L18] COND FALSE !(m < 0) [L21] COND FALSE !(m == 0) [L24] CALL, EXPR mult(n, m - 1) [L18] COND FALSE !(m < 0) [L21] COND FALSE !(m == 0) [L24] CALL, EXPR mult(n, m - 1) [L18] COND FALSE !(m < 0) [L21] COND TRUE m == 0 [L22] return 0; [L24] RET, EXPR mult(n, m - 1) [L24] return n + mult(n, m - 1); [L24] RET, EXPR mult(n, m - 1) [L24] return n + mult(n, m - 1); [L36] RET, EXPR mult(m, n) [L36] int res1 = mult(m, n); [L37] CALL, EXPR mult(n, m) [L18] COND FALSE !(m < 0) [L21] COND FALSE !(m == 0) [L24] CALL, EXPR mult(n, m - 1) [L18] COND FALSE !(m < 0) [L21] COND FALSE !(m == 0) [L24] CALL, EXPR mult(n, m - 1) [L18] COND FALSE !(m < 0) [L21] COND TRUE m == 0 [L22] return 0; [L24] RET, EXPR mult(n, m - 1) [L24] return n + mult(n, m - 1); [L24] RET, EXPR mult(n, m - 1) [L24] return n + mult(n, m - 1); [L37] RET, EXPR mult(n, m) [L37] int res2 = mult(n, m); [L38] COND TRUE res1 != res2 && m > 0 && n > 0 [L39] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 23 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 40.3s, OverallIterations: 8, TraceHistogramMax: 6, PathProgramHistogramMax: 4, EmptinessCheckTime: 0.0s, AutomataDifference: 3.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 131 SDtfs, 162 SDslu, 814 SDs, 0 SdLazy, 1222 SolverSat, 110 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1125 GetRequests, 970 SyntacticMatches, 0 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1274 ImplicationChecksByTransitivity, 12.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=34occurred in iteration=5, InterpolantAutomatonStates: 74, 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, 7 MinimizatonAttempts, 31 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.6s SatisfiabilityAnalysisTime, 23.6s InterpolantComputationTime, 611 NumberOfCodeBlocks, 611 NumberOfCodeBlocksAsserted, 31 NumberOfCheckSat, 1139 ConstructedInterpolants, 10 QuantifiedInterpolants, 4276 SizeOfPredicates, 85 NumberOfNonLiveVariables, 1389 ConjunctsInSsa, 240 ConjunctsInUnsatCore, 35 InterpolantComputations, 7 PerfectInterpolantSequences, 960/1215 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 could not prove your program: unable to determine feasibility of some traces [2021-11-07 02:07:58,483 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_72d66b15-10df-462a-81c5-eed3ee383f25/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Result: UNKNOWN